A safety transport packaging box for large radioactive items

Abstract

The present invention discloses a safety transport packing box for large radioactive articles, which comprises an outer box, an inner box, and a rigid-flexible composite positioning and supporting assembly. The combined structure of the inner rotary buckle petal flange III and the annular groove II of the inner lower box in this application can significantly improve the impact resistance of the inner box and reduce the design requirements for external energy-absorbing structures; by adopting the rigid-flexible composite positioning and supporting assembly of this application, the kinetic energy of large radioactive articles during impact can be dissipated to the maximum extent under the condition of smaller space requirements; by adopting the concave limit structure at the mouth of the heat insulation layer I in this application, the technical problem of the failure of the outer box connection structure and the loss of heat insulation function during the collision of the edge of the outer box cover can be solved without increasing the volume of the packing box. The safety transport packing box for large radioactive articles designed by this application can be miniaturized and lightweight while meeting the requirements of GB11806 B(U) type packages, improving the convenience of use and facilitating the implementation of actual transport activities.

Description

Technical Field

[0001] The present invention relates to the technical field of safe transportation of radioactive substances, and particularly to a safety transportation packing box for large radioactive substances. Background Art

[0002] Transportation is an essential and important link in the circulation process of radioactive substances. Given the potential risks of radioactive substance transportation to the environment and personnel, the international community has always attached great importance to the management of radioactive substance transportation. The International Atomic Energy Agency (IAEA) has issued the Regulations for the Safe Transport of Radioactive Material. China has promulgated the Regulations on the Safety Management of Radioactive Substance Transportation for the safety of radioactive substance transportation, and has also formed the national mandatory standard GB11806, Regulations for the Safe Transport of Radioactive Material, to guide and standardize the safe transportation of radioactive substances, especially making clear regulations on the safety requirements of the packing boxes carried. Large radioactive substances, that is, the objects to be packed, with a volume not less than 1 m3 and a mass not less than 700 kg, usually achieve circulation by land transportation. The packing boxes carried in accordance with the provisions of GB11806 should meet the various design requirements of Type BU packages. Up to now, most of the publicly reported safety transportation packing boxes for radioactive substances are for radioactive substances with small volume and mass, and basically adopt the design scheme of soft energy-absorbing materials / structures to solve the technical problems faced by the box body in energy absorption, sealing, and heat insulation under the specified impact and fire environments.

[0003] For large radioactive substances with huge volume and significant mass, the volume and mass of the packing boxes directly formed by referring to the energy absorption design principle are inevitably huge, which is difficult to adapt to the transport vehicles and extremely inconvenient to use and operate; considering the randomness of impact accidents and the non-linear characteristics of the packing box materials / structures, the distortion effect of the dynamic simulation model is obvious and difficult to correct during the impact process. Therefore, it is also difficult to realize the extrapolation design from small to large by using the similarity principle. There is an urgent need to develop a safety transportation packing box for large radioactive substances that meets the design requirements of Type BU packages in GB11806 to reduce the harm of radioactive leakage of radioactive substances in the preset transportation accident scenario to below the limit level.

[0004] Therefore, a safety transportation packing box for large radioactive substances is developed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to design a safety transportation packing box for large radioactive substances to solve the above problems.

[0006] The present invention realizes the above purpose through the following technical solutions:

[0007] A safety transportation packing box for large radioactive substances, comprising:

[0008] An outer box;

[0009] Inner box; the inner box is installed inside the outer box, with a small radial clearance fit between the inner box and the outer box, and assembled in a pre-tightened state axially of the outer box.

[0010] Rigid-flexible composite positioning and supporting component; the rigid-flexible composite positioning and supporting component is installed inside the inner box, axially pre-tightened and assembled along the inner box, and radioactive substances are placed inside the rigid-flexible composite positioning and supporting component.

[0011] Specifically, the outer box includes an outer box cover, bolt Ⅰ, and a lower box body. The outer box cover is set on the lower box body and connected by a plurality of bolt Ⅰ.

[0012] Specifically, a radially convex petal flange Ⅰ is provided at the edge of the outer box cover, a radially concave petal flange Ⅱ is provided at the upper end of the lower box body, and a protrusion Ⅰ is also provided below the petal flange Ⅱ on the lower box body. An annular groove Ⅰ is formed between the protrusion Ⅰ and the petal flange Ⅱ. The petal flange Ⅰ is placed in the annular groove Ⅰ, and the petal flange Ⅱ and the petal flange Ⅰ are screwed and aligned. A plurality of through holes are provided on the petal flange Ⅰ, and correspondingly, a plurality of screw holes are provided on the protrusion Ⅰ. A plurality of bolt Ⅰ pass through the through holes on the petal flange Ⅰ and are screwed into the screw holes on the protrusion Ⅰ.

[0013] Specifically, the outer box further includes a heat insulation component. The heat insulation component includes a heat insulation layer Ⅰ and a heat insulation layer Ⅱ. The heat insulation layer Ⅰ is formed into a barrel-shaped structure, and the heat insulation layer Ⅱ is formed into a cylindrical structure. The bottom surface and the outer side surface of the heat insulation layer Ⅰ are adhesively connected to the inner bottom surface and the inner side surface of the lower box body respectively, and the top surface of the heat insulation layer Ⅰ is tightly attached to the bottom of the protrusion; the upper end of the heat insulation layer Ⅱ is connected to the lower end of the outer box cover.

[0014] Specifically, foam plastic layers are formed at the bottom of the heat insulation layer Ⅰ and the bottom of the heat insulation layer Ⅱ.

[0015] Specifically, both the heat insulation layer Ⅰ and the heat insulation layer Ⅱ are made of spruce, and the foam plastic layer is made of rigid polyurethane foam plastic with a density of 250 kg / cm 3 ~350 kg / cm 3 of.

[0016] Specifically, the inner box includes an inner box cover, an inner lower box, an inner rotary buckle petal flange III, a flange face hexagon bolt, and a set screw. At the edge of the inner box cover, there is a radially outwardly protruding inner rotary buckle petal flange III. At the upper end of the inner lower box, there is a radially inwardly protruding petal flange IV. Below the petal flange IV on the inner lower box, there is also a protrusion II. An annular groove II is formed between the protrusion II and the petal flange IV. The inner rotary buckle petal flange III is placed in the annular groove II, and the inner rotary buckle petal flange III is screwed and aligned with the petal flange IV. A plurality of through holes are provided on the inner rotary buckle petal flange III. Correspondingly, a plurality of screw holes are provided on the protrusion II. A plurality of flange face hexagon bolts pass through the through holes on the inner rotary buckle petal flange III and are screwed into the screw holes on the protrusion II; There are also screw holes on the inner rotary buckle petal flange III, and the set screw is screwed into the screw hole and presses down tightly on the petal flange IV.

[0017] Specifically, the inner box further includes an O-ring seal. An annular groove III is provided on the side wall of the inner box cover. The O-ring seal is placed in the annular groove III, and the outer wall of the O-ring seal is connected to the inner wall of the inner lower box.

[0018] Specifically, the rigid-flexible composite positioning and support assembly includes a lower assembly, a middle assembly, and an upper assembly;

[0019] The lower assembly includes a foam plastic part I, a load dispersion plate I, and a shock isolation pad. The foam plastic part I is formed into a columnar structure. The bottom of the load dispersion plate I is formed into a plate-like structure, and a circular ring-shaped protrusion is formed above the plate-like structure. The shock isolation pad is pasted on the inner bottom of the circular ring-shaped protrusion;

[0020] The middle assembly includes a foam plastic part II, a petal flange V, and a petal flange VI. The foam plastic part II is formed into a circular ring columnar structure. The circular ring-shaped protrusion is placed inside the lower part of the foam plastic part II; The petal flange V is installed at the upper end of the foam plastic part II. There is also a radially protruding ring below the petal flange V. An annular groove III is formed between the protruding ring and the petal flange V. The petal flange VI is placed in the annular groove III, and the petal flange V is screwed and aligned with the petal flange VI. Through holes are provided on the petal flange VI, and screw holes are provided on the petal flange V. Bolt II passes through the through holes on the petal flange VI and is screwed into the screw holes on the petal flange V; The load dispersion plate I is placed between the foam plastic part I and the foam plastic part II;

[0021] The upper assembly includes a foam plastic part III, a load dispersion plate II, a foam plastic part IV, and a pressing structure. The foam plastic part III is installed above the petal flange VI. The foam plastic part IV is installed above the foam plastic part III. The load dispersion plate II is installed between the foam plastic part III and the foam plastic part IV. The pressing structure is installed above the foam plastic part IV.

[0022] Specifically, the foam plastic part I, the load dispersion plate I, the foam plastic part II, the petal flange V, the petal flange VI, the foam plastic part III, the load dispersion plate II, the foam plastic part IV, and the pressing structure are coaxially arranged.

[0023] The beneficial effects of the present invention are as follows:

[0024] The combined structure of the internal rotation button petal flange III of the present application and the annular groove II of the inner lower box can significantly improve the impact resistance of the inner box and reduce the design requirements for the external energy-absorbing structure; by adopting the rigid-flexible composite positioning and supporting component of the present application, the kinetic energy of large radioactive items during impact can be dissipated to the maximum extent under the condition of relatively small space requirements; by adopting the concave limit structure at the mouth of the heat insulation layer I of the present application, the technical problem of the failure of the external box connection structure and the loss of heat insulation function during the collision of the edge of the outer box cover can be solved without increasing the volume of the packaging box. The large radioactive item safety transportation packaging box designed by the present application can be miniaturized and lightened while meeting the requirements of GB11806 B(U)-type package, improving the convenience of use and facilitating the implementation of actual transportation activities. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of a large radioactive item safety transportation packaging box of the present invention.

[0026] Figure 2 It is a schematic diagram of the outer box of the present invention.

[0027] Figure 3 It is a schematic diagram of the inner box of the present invention.

[0028] Figure 4 It is a schematic diagram of the rigid-flexible composite positioning and supporting component of the present invention.

[0029] In the figure: 1 - outer box; 11 - outer box cover; 12 - bolt I; 13 - heat insulation component; 131 - heat insulation layer I; 132 - heat insulation layer II; 14 - lower box body; 2 - inner box; 21 - inner box cover; 22 - inner lower box; 23 - internal rotation button petal flange III 23; 24 - O-ring seal; 25 - flange face hexagon bolt; 26 - set screw; 3 - rigid-flexible composite positioning and supporting component; 31 - lower component; 311 - foam plastic part III; 312 - load dispersion plate I; 313 - shock isolation pad; 32 - middle component; 321 - foam plastic part II; 322 - petal flange V; 323 - petal flange VI; 33 - upper component; 331 - foam plastic part I; 332 - load dispersion plate II; 333 - foam plastic part IV; 334 - pressing structure. Detailed Embodiments

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships in which the inventive product is customarily placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0034] In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, terms such as "set", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The following will specifically describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0037] As Figure 1 shown, a safety transport packaging box for large radioactive items includes:

[0038] an outer box 1;

[0039] Inner box 2; the inner box 2 is installed inside the outer box 1, and the inner box 2 is in a small radial clearance fit with the outer box 1 and is assembled in a pre-tightened state axially of the outer box 1.

[0040] Rigid-flexible composite positioning and supporting assembly 3; the rigid-flexible composite positioning and supporting assembly 3 is installed inside the inner box 2, the rigid-flexible composite positioning and supporting assembly 3 is axially pre-tightened and assembled along the inner box 2, and radioactive substances are placed inside the rigid-flexible composite positioning and supporting assembly 3.

[0041] As Figure 2 shown, the outer box 1 includes an outer box cover 11, bolts I 12, and a lower box body 14, and the outer box cover 11 covers the lower box body 14.

[0042] As Figure 2 shown, a radially outwardly convex petal flange I is provided at the edge of the outer box cover 11, specifically a flange with a sunken petal feature. A radially inwardly convex petal flange II is provided at the upper end of the lower box body 14. A protrusion I is further provided below the petal flange II on the lower box body 14. An annular groove I is formed between the protrusion I and the petal flange II. The petal flange I is placed in the annular groove I, and the petal flange II is screwed and aligned with the petal flange I. A plurality of through holes are provided on the petal flange I, and correspondingly a plurality of screw holes are provided on the protrusion I. A plurality of bolts I 12 pass through the through holes on the petal flange I and are screwed into the screw holes on the protrusion I.

[0043] As Figure 2 shown, the outer box 1 further includes a heat insulation assembly 13. The heat insulation assembly 13 includes a heat insulation layer I 131 and a heat insulation layer II 132. The heat insulation layer I 131 is formed into a barrel-shaped structure, and the heat insulation layer II 132 is formed into a cylindrical structure. The bottom surface and the outer side surface of the heat insulation layer I 131 are adhesively connected to the inner bottom surface and the inner side surface of the lower box body 14 respectively. The top surface of the heat insulation layer I 131 is attached and pressed against the bottom of the protrusion; the upper end of the heat insulation layer II 132 is connected to the lower end of the outer box cover 11. The mouth of the heat insulation layer I 131 has a limiting structure with an inward concave feature.

[0044] Foam plastic layers are formed at the bottom of the heat insulation layer I 131 and the bottom of the heat insulation layer II 132.

[0045] Both the heat insulation layer I 131 and the heat insulation layer II 132 are made of spruce, or woods with mechanical properties equivalent to spruce can also be used; and the foam plastic layer is made of rigid polyurethane foam plastic with a density of 250 kg / cm 3 ~350 kg / cm 3 and has the feature of a relatively wide yield stress platform; the strength grade of the bolts I 12 is not lower than 8.8.

[0046] In some embodiments, a pressure relief structure with a low melting point alloy plugging feature is further provided on the outer box cover 11, and the low melting point material used for the pressure relief structure is tin alloy.

[0047] In some embodiments, the materials of the outer box cover 11 and the lower box body 14 are selected as austenitic stainless steel or low carbon steel with good ductility and weldability.

[0048] In some embodiments, the radial clearance between the inner box 2 and the thermal insulation layer I 131 is assembled as evenly as possible, and it is ensured that the bottom surface of the inner box 2 contacts the foam plastic layer on the thermal insulation layer I 131. The radial clearance between the thermal insulation layer II 132 and the lower box body 14 is assembled as evenly as possible, and the lower end surface of the flange of the lower box body 14 presses the thermal insulation layer II 132.

[0049] As Figure 3 shown, the inner box 2 includes an inner box cover 21, an inner lower box 22, an inner rotary buckle petal flange III 23, a flange surface hexagon bolt 25, and a set screw 26. A radially outwardly protruding inner rotary buckle petal flange III is provided at the edge of the inner box cover 21. A radially inwardly protruding petal flange IV is provided at the upper end of the inner lower box 22. A protrusion II is further provided on the inner lower box 22 below the petal flange IV. An annular groove II is formed between the protrusion II and the petal flange IV. The inner rotary buckle petal flange III is placed in the annular groove II, and the inner rotary buckle petal flange III 23 is screwed and aligned with the petal flange IV. A plurality of through holes are provided on the inner rotary buckle petal flange III 23. Correspondingly, a plurality of screw holes are provided on the protrusion II. A plurality of flange surface hexagon bolts 25 pass through the through holes on the inner rotary buckle petal flange III 23 and are screwed into the screw holes on the protrusion II; A screw hole is further provided on the inner rotary buckle petal flange III 23, and the set screw 26 is screwed into the screw hole and presses down on the petal flange IV.

[0050] As Figure 3 shown, the inner box 2 further includes an O-ring 24. An annular groove III is provided on the side wall of the inner box cover 21. The O-ring 24 is placed in the annular groove III, and the outer wall of the O-ring 24 is connected to the inner wall of the inner lower box 22.

[0051] The materials of the inner box cover, the inner lower box, and the inner rotary buckle petal flange III are all made of high-strength steel, preferably martensitic precipitation hardening stainless steel. The material of the O-ring is rubber with an appropriate Shore hardness, preferably ethylene propylene diene monomer rubber.

[0052] During operation, the O-ring seal 24 is pre-installed in the "C"-shaped annular groove III of the inner box cover 21. After the object to be packaged is assembled with the rigid-flexible composite positioning and supporting component 3, the inner box cover 21 is inserted into the inner lower box 22, and the flange face hexagon bolt 25 is tightened according to the specified torque. The petal flange of the inner snap 23 is screwed into the "C"-shaped groove of the inner lower box 22, and the set screw 26 is tightened according to the specified tightening torque. The strength grade of the flange face hexagon bolt 25 is not less than 10.9, and the strength grade of the set screw 26 is not less than 8.8.

[0053] As Figure 4 shown, the rigid-flexible composite positioning and supporting component 3 includes a lower component 31, a middle component 32, and an upper component 33;

[0054] The lower component 31 includes a foam plastic part I 311, a load dispersion plate I 312, and a shock isolation pad 313. The foam plastic part I 311 is formed into a columnar structure. The bottom of the load dispersion plate I 312 is formed into a plate-like structure, and a circular ring-shaped protrusion is formed above the plate-like structure. The shock isolation pad 313 is pasted on the inner bottom of the circular ring-shaped protrusion;

[0055] The middle component 32 includes a foam plastic part II 321, a petal flange V 322, and a petal flange VI 323. The foam plastic part II 321 is formed into a circular ring columnar structure, and the circular ring-shaped protrusion is placed inside the lower part of the foam plastic part II 321; The petal flange V 322 is installed at the upper end of the foam plastic part II 321. A radial convex ring is also provided below the petal flange V 322, and an annular groove III is formed between the convex ring and the petal flange V 322. The petal flange VI 323 is placed in the annular groove III, and the petal flange V 322 and the petal flange VI 323 are screwed and aligned. A through hole is provided on the petal flange VI 323, and a screw hole is provided on the petal flange V 322. The bolt II passes through the through hole on the petal flange VI 323 and is screwed into the screw hole on the petal flange V 322; The load dispersion plate I 312 is placed between the foam plastic part I 311 and the foam plastic part II 321;

[0056] The upper component 33 includes a foam plastic part III 331, a load dispersion plate II 332, a foam plastic part IV 333, and a pressing structure 334. The foam plastic part III 331 is installed above the petal flange VI 323, the foam plastic part IV 333 is installed above the foam plastic part III 331, the load dispersion plate II 332 is installed between the foam plastic part III 331 and the foam plastic part IV 333, and the pressing structure 334 is installed above the foam plastic part IV 333.

[0057] As Figure 4 shown, the foam plastic part I 311, the load dispersion plate I 312, the foam plastic part II 321, the petal flange V 322, the petal flange VI 323, the foam plastic part III 331, the load dispersion plate II 332, the foam plastic part IV 333, and the pressing structure 334 are coaxially arranged.

[0058] The load dispersion plates all have rigid features, and the foam plastic parts all have flexible features;

[0059] The petal flanges Ⅴ322 and Ⅵ323 are provided with a hollow structure for regulating the stiffness and mass. The edge of the petal flange Ⅴ322 is welded to the inner lower box to press and limit the foam plastic parts of the lower component and the middle component. After the bayonet of the petal flange Ⅵ323 is connected to the packaged object, it is screwed into the annular groove Ⅲ together and pre-tightened by the bolt Ⅱ. The load dispersion plate is made of metal material, which can be aluminum alloy or alloy steel. The material of the shock isolation pad is damping ZN-1 rubber. The material of the foam plastic part is rigid polyurethane foam with a relatively wide yield stress platform. The materials of the petal flanges Ⅴ and Ⅵ are low-carbon steel or austenitic stainless steel.

[0060] The following gives an application example of a large radioactive material safety transport packaging box.

[0061] The radial clearance between the inner box 2 and the heat insulation layer Ⅰ131 is 2.0 mm, and the radial clearance between the heat insulation layer Ⅱ132 and the lower box body 14 is 1.5 mm. The number of petal flanges of the outer box cover 11 and the lower box body 14 is 12 groups. The specification of the bolt Ⅰ12 is M10×25, the number is 12, and the strength grade is 10.9. The tightening torque applied is 20 N.m. The materials of the outer box cover 11 and the lower box body 14 are 06Cr19Ni10, and the materials of the heat insulation layer Ⅰ131 and the heat insulation layer Ⅱ132 are spruce with a moisture content lower than 15%.

[0062] The materials of the inner box cover 21, the inner lower box 22, and the inner rotary buckle petal flange Ⅲ23 are all 05Cr17Ni4Cu4Nb. The specification of the flange face hexagon bolt 25 is M12×35, the number is 32, the strength grade is 10.9, the tightening torque is 35 N.m. The specification of the set screw 26 is M10×20, the number is 12, the strength grade is 10.9, the tightening torque is 20 N.m. The material of the O-ring 24 has a Shore hardness of 72HA.

[0063] The petal flange Ⅴ322 and the inner lower box 22 are welded in sections, and the effective weld depth is not less than 2.5 mm. The number of petals of the petal flange Ⅴ322 and the petal flange Ⅵ323 is 12 groups. The specification of the flange face hexagon bolt 34 is M10×20, the number is 12, the strength grade is 10.9, and the tightening torque is 20 N.m. The load dispersion plates Ⅰ and Ⅱ are made of 5A06. The thickness of the shock isolation pad 313 is 3.5 mm. The material density of the foam plastic parts Ⅲ331 and Ⅳ333 is 250 kg / cm3 - 350 kg / cm3. The material of the petal flange Ⅴ322 is 06Cr19Ni10, and the material of the petal flange Ⅵ323 is 05Cr17Ni4Cu4Nb.

[0064] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A safety transport packaging box for large radioactive items, Characterized in that, Comprising: An outer box (1); An inner box (2); The inner box (2) is installed inside the outer box (1), and the inner box (2) is in a small radial clearance fit with the outer box (1) and is assembled in an axially pre-tightened state of the outer box (1); A rigid-flexible composite positioning and supporting component (3); The rigid-flexible composite positioning and supporting component (3) is installed inside the inner box (2), and the rigid-flexible composite positioning and supporting component (3) is axially pre-tightened and assembled along the inner box (2), and the radioactive item is placed inside the rigid-flexible composite positioning and supporting component (3); The rigid-flexible composite positioning and supporting component (3) includes a lower component (31), a middle component (32), and an upper component (33); The lower component (31) includes a foam plastic part I (311), a load dispersion plate I (312), and a shock isolation pad (313). The foam plastic part I (311) is formed into a columnar structure, the bottom of the load dispersion plate I (312) is formed into a plate-like structure, and a circular ring-shaped protrusion is formed above the plate-like structure. The shock isolation pad (313) is pasted on the inner bottom of the circular ring-shaped protrusion; The middle component (32) includes a foam plastic part II (321), a petal flange V (322), and a petal flange VI (323). The foam plastic part II (321) is formed into a circular ring-shaped columnar structure, and the circular ring-shaped protrusion is placed inside the lower part of the foam plastic part II (321); The petal flange V (322) is installed at the upper end of the foam plastic part II (321). A radial convex ring is also provided below the petal flange V (322), and an annular groove III is formed between the convex ring and the petal flange V (322). The petal flange VI (323) is placed inside the annular groove III, and the petal flange V (322) and the petal flange VI (323) are screwed and aligned. A through hole is provided on the petal flange VI (323), and a screw hole is provided on the petal flange V (322). A bolt II passes through the through hole on the petal flange VI (323) and is screwed into the screw hole on the petal flange V (322); The load dispersion plate I (312) is placed between the foam plastic part I (311) and the foam plastic part II (321); The upper component (33) includes a foam plastic part III (331), a load dispersion plate II (332), a foam plastic part IV (333), and a pressing structure (334). The foam plastic part III (331) is installed above the petal flange VI (323), the foam plastic part IV (333) is installed above the foam plastic part III (331), the load dispersion plate II (332) is installed between the foam plastic part III (331) and the foam plastic part IV (333), and the pressing structure (334) is installed above the foam plastic part IV (333).

2. A safety transport packaging box for large radioactive items according to claim 1, Characterized in that, The outer box (1) includes an outer box cover (11), bolts I (12), and a lower box body (14). The outer box cover (11) is covered on the lower box body (14) and is connected by a plurality of bolts I (12).

3. A safety transport packaging box for large radioactive items according to claim 2, Characterized in that, At the edge of the outer box cover (11), there is a radially outwardly protruding petal flange I. At the upper end of the lower box body (14), there is a radially inwardly protruding petal flange II. Below the petal flange II on the lower box body (14), there is also a protrusion I. An annular groove I is formed between the protrusion I and the petal flange II. The petal flange I is placed in the annular groove I, and the petal flange II is screwed and aligned with the petal flange I. A plurality of through holes are provided on the petal flange I. Correspondingly, a plurality of screw holes are provided on the protrusion I. A plurality of bolts I (12) pass through the through holes on the petal flange I and are screwed into the screw holes on the protrusion I.

4. The safety transport packaging box for large radioactive items according to claim 3, characterized in that, the outer box (1) further includes a heat insulation assembly (13). The heat insulation assembly (13) includes a heat insulation layer I (131) and a heat insulation layer II (132). The heat insulation layer I (131) is formed into a barrel-shaped structure, and the heat insulation layer II (132) is formed into a cylindrical structure. The bottom surface and the outer side surface of the heat insulation layer I (131) are adhesively connected to the inner bottom surface and the inner side surface of the lower box body (14) correspondingly. The top surface of the heat insulation layer I (131) is tightly attached to the bottom of the protrusion; the upper end of the heat insulation layer II (132) is connected to the lower end of the outer box cover (11).

5. The safety transport packaging box for large radioactive items according to claim 4, characterized in that, foam plastic layers are formed at the bottom of the heat insulation layer I (131) and the bottom of the heat insulation layer II (132).

6. The safety transport packaging box for large radioactive items according to claim 5, characterized in that, Both the heat insulation layer I (131) and the heat insulation layer II (132) are made of spruce, and the foam plastic layer is made of rigid polyurethane foam with a density of 250 kg / cm 3 ~350 kg / cm 3 .

7. The safety transport packaging box for large radioactive items according to claim 1, characterized in that, The inner box (2) includes an inner box cover (21), an inner lower box (22), an inner rotating buckle petal flange III (23), a flange surface hexagon bolt (25), and a set screw (26). At the edge of the inner box cover (21), there is a radially outwardly protruding inner rotating buckle petal flange III. At the upper end of the inner lower box (22), there is a radially inwardly protruding petal flange IV. Below the petal flange IV on the inner lower box (22), there is also a protrusion II. An annular groove II is formed between the protrusion II and the petal flange IV. The inner rotating buckle petal flange III is placed in the annular groove II, and the inner rotating buckle petal flange III (23) is screwed and aligned with the petal flange IV. A plurality of through holes are provided on the inner rotating buckle petal flange III (23). Correspondingly, a plurality of screw holes are provided on the protrusion II. A plurality of flange surface hexagon bolts (25) pass through the through holes on the inner rotating buckle petal flange III (23) and are screwed into the screw holes on the protrusion II; screw holes are also provided on the inner rotating buckle petal flange III (23), and the set screw (26) is screwed into the screw holes to tightly press the petal flange IV downward.

8. The safety transport packaging box for large radioactive items according to claim 7, characterized in that, the inner box (2) further includes an O-ring (24). An annular groove III is provided on the side wall of the inner box cover (21). The O-ring (24) is placed in the annular groove III, and the outer wall of the O-ring (24) is connected to the inner wall of the inner lower box (22).

9. The safety transport packaging box for a large radioactive article according to claim 1, characterized in that, the foam plastic part I (311), the load dispersion plate I (312), the foam plastic part II (321), the petal flange V (322), the petal flange VI (323), the foam plastic part III (331), the load dispersion plate II (332), the foam plastic part IV (333) and the pressing structure (334) are coaxially arranged.

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