A special tray for nuclear fuel pellets and a manufacturing process thereof

Abstract

The application relates to the technical field of nuclear fuel pellet temporary storage, in particular to a special tray for nuclear fuel pellets and a manufacturing process thereof, which comprises a loadable tray body and a reinforcing body arranged at the bottom of the loadable tray body to prevent the loadable tray body from being deformed, a plurality of positioning grooves extending along the Y-axis direction are arranged at the loadable tray body along the X-axis direction at intervals, the bottom of the positioning groove is in contact with a part of the reinforcing body, the reinforcing body has a protruding part protruding towards the positioning groove, the protruding part is staggered along the Y-axis direction and is provided with upper and lower protruding parts extending along the X-axis direction, the upper protruding part is provided with an airflow flowing position along the X-axis, the relative two outer sides of the loadable tray body are provided with reinforcing parts, the reinforcing body is provided with a fixing part around the protruding part, the fixing part is connected with the loadable tray body, and the reinforcing parts and the fixing parts are provided with positioning parts correspondingly. The application has the advantages of simple structure, stackability, high hardness, light weight, corrosion resistance, high temperature resistance, long service life of the product, small deformation coefficient, convenient carrying and storage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear fuel pellet temporary storage, in particular to a special tray for nuclear fuel pellets and a manufacturing process thereof. BACKGROUND

[0002] Nuclear fuel pellets are the core part of nuclear fuel elements, generally in the form of small cylindrical blocks. In the nuclear fuel assembly industry, after the production of fuel pellets, they need to be stored and transferred through trays. Currently, the commonly used tray is a single-layer corrugated plate structure. This kind of tray has the following problems when storing the pellets: 1. The tray has poor rigidity and deforms during use; 2. The tray cannot be stacked due to the single-layer corrugated plate structure and needs to be stored in a special tray cabinet; 3. The tray cannot be stacked due to the single-layer corrugated plate structure, which makes it impossible to realize the automation of pellet storage and transfer. SUMMARY

[0003] The present application provides a special tray for nuclear fuel pellets and a manufacturing process thereof to solve the problems of poor rigidity of the tray, deformation during use, inability to stack due to the single-layer corrugated plate structure, and the need to use a special tray cabinet for storage, which makes it impossible to realize the automation of pellet storage and transfer.

[0004] The technical solution of the present application to solve the above technical problems is as follows: a special tray for nuclear fuel pellets, characterized by comprising a loadable tray body that can be stacked and a reinforcing body arranged at the bottom of the loadable tray body to prevent the loadable tray body from deforming.

[0005] The loadable tray body is arranged with a plurality of positioning grooves extending along the Y-axis direction at intervals along the X-axis direction, the bottom of the positioning groove is in contact with a part of the reinforcing body, and the opposite two side walls of the positioning groove gradually approach from the top to the bottom to form an upper V-shaped connecting part; the adjacent two side walls of two adjacent positioning grooves gradually move away from each other from the top to the bottom, and the top of the adjacent two side walls is connected to form a lower V-shaped connecting part; when loading the nuclear fuel pellets, the opposite two side walls of the positioning groove support the edge of the nuclear fuel pellets, so that a gap is formed between the nuclear fuel pellets and the upper V-shaped connecting part.

[0006] The reinforcing body has a protruding part protruding towards the direction of the positioning groove, and the protruding part is arranged with an upper protruding part and a lower protruding part extending along the X-axis direction at intervals along the Y-axis direction, the upper protruding part is in contact with the lower V-shaped connecting part, and the upper protruding part is arranged with an airflow flow position along the X-axis;

[0007] The loadable tray body has a reinforcing part on the opposite two outer sides, and the reinforcing part is in the same plane as the top of the lower V-shaped connecting part; the reinforcing body has a fixing part arranged around the protruding part, and the fixing part is connected with the loadable tray body; the reinforcing part and the fixing part are provided with a positioning part correspondingly, and the positioning part of the lower loadable tray body is inserted into the positioning part of the reinforcing body of the upper loadable tray body when the loadable tray bodies are stacked.

[0008] The side of the reinforcing part is provided with an information identification area.

[0009] Based on the technical scheme, the application further has the following improvements.

[0010] Further, a stopper is formed at one end of each positioning groove, the outer side wall of the stopper is in the same plane as the outer side wall of the bearing disc body, the inner side wall of the stopper is gradually inclined from the top to the bottom, and the height of the stopper is lower than the height of the positioning groove.

[0011] Further, the fixing part comprises a group of vertical edges arranged on the opposite sides of the protruding part and perpendicular to the protruding part, and a horizontal connecting edge connected with the group of vertical edges and in contact with the surface of the lower bearing disc body; the horizontal connecting edge on one side of the group of vertical edges is formed with a welding edge, and the height of the vertical edge is greater than the height of the lower protruding part.

[0012] Further, the positioning part is arranged on the horizontal connecting edge between the vertical edge and the welding edge, and the positioning part is a hollow conical protrusion.

[0013] Further, the information identification area comprises a groove arranged on the side wall of the reinforcing part, and a two-dimensional code is arranged in the groove.

[0014] Further, the fixing part further comprises a geometric positioning structure for preventing the nuclear fuel pellets loaded on the lower bearing disc body from exiting the positioning groove, the geometric positioning structure is provided with a group of inclined blocking edges adjacent to the group of vertical edges and connected with the protruding part and the horizontal connecting edge, the inclined blocking edges are gradually inclined outward from the protruding part along the horizontal connecting edge; the horizontal connecting edge on one side of the group of inclined blocking edges is formed with a handle edge, the handle edge is formed with a hand carrying groove and a mechanical lifting groove recessed towards the inclined blocking edge, and the side wall of the bearing disc body is provided with a notch matching the hand carrying groove and the mechanical lifting groove; the height of the inclined blocking edge is greater than the height of the lower protruding part and is equal to the height of the vertical edge.

[0015] Further, the airflow flow position is provided with a plurality of through grooves.

[0016] Further, the surface of the bearing disc body is a mirror surface.

[0017] Further, the bearing disc body is made of stainless steel and is integrally stamped, and the reinforcing body is made of stainless steel and is integrally stamped.

[0018] In summary, the application further provides a manufacturing process of the special tray for nuclear fuel pellets, and the manufacturing steps are as follows:

[0019] S1, cutting: using laser cutting to cut the stainless steel plate into a sheet suitable for stamping;

[0020] S2, pretreatment: cleaning the surface of the punched sheet in S1 to remove oil stains, dust and other impurities, and applying a lubricant on the surface of the sheet after cleaning;

[0021] S3, forming of the upper and lower feeding plates: using a special stamping die, the sheet processed in S2 is pressed into the inner cavity of the die by a press to form the required disc-shaped structure. The upper and lower feeding plates can be formed by multiple deep drawing to obtain a carrier disc body and a reinforcing body;

[0022] S4, laser welding: placing the carrier disc body and the reinforcing body obtained in S3 in a special welding jig, and using an automatic laser welding machine to weld the carrier disc body and the reinforcing body to obtain the special tray for nuclear fuel pellets;

[0023] S5, edge trimming / deburring: removing the excess material at the edges of the special tray for nuclear fuel pellets obtained in S4 by an edge trimming die to ensure smooth edges, and deburring the tray to improve the hand feeling and safety of the product;

[0024] S6, shaping: making final adjustments to the special tray for nuclear fuel pellets which has been basically shaped to ensure accurate dimensions and shape in accordance with design requirements;

[0025] S7, polishing: polishing the special tray for nuclear fuel pellets to make the surface of the special tray for nuclear fuel pellets mirror-like to ensure that the special tray for nuclear fuel pellets does not scratch the nuclear fuel pellets when they are put in or taken out;

[0026] S8, cleaning and inspection: cleaning the special tray for nuclear fuel pellets after polishing to remove oil stains and impurities that may be generated during the stamping process, and conducting quality inspection to check whether the special tray for nuclear fuel pellets has cracks, deformation, or dimensional deviation;

[0027] S9, two-dimensional code engraving: using a laser marking machine to engrave two-dimensional codes on both sides of the special tray for nuclear fuel pellets.

[0028] The beneficial effects of the above scheme are:

[0029] 1. The reinforcing body is arranged on the carrier disc body, and the upper protrusion and the lower protrusion are arranged in a staggered manner on the reinforcing body, which increases the strength of the reinforcing body, and the directions of the upper protrusion and the lower protrusion are perpendicular to the direction of the positioning groove, which can effectively prevent the tray from bending and deforming during the loading process when the carrier disc body carries the nuclear fuel pellets.

[0030] 2. The positioning part is arranged on the carrier disc body and the reinforcing body, the positioning part at the lower carrier disc body is inserted into the positioning part at the upper reinforcing body when the carrier disc bodies are stacked, which can realize the mutual stacking of multiple trays for the storage and circulation of the trays, prevent the stacked trays from falling off during transportation, and play a role in mutual positioning. In addition, the upper protrusion and the lower protrusion are arranged in a staggered manner on the reinforcing body to strengthen the overall bearing capacity of the tray and prevent the tray from deforming.

[0031] 3、By gradually connecting the opposite two side walls of the positioning groove from the top to the bottom to form the upper V-shaped connecting part, the spacing is formed between the nuclear fuel pellets and the upper V-shaped connecting part, and the airflow flow position is arranged along the X axis on the upper protruding part, so as to facilitate the air flow during the subsequent baking or storage.

[0032] 4、By setting a reinforcing body with a protruding part, a hollow area is formed in the middle of the reinforcing body, which reduces the weight of the tray, and can avoid extrusion of the upper tray on the nuclear fuel pellets in the lower layer, and a fixing part connected with the protruding part is arranged, so as to facilitate the welding of the reinforcing body and the bearing disc body, and the fixing part can play a geometric limiting role, which can prevent the nuclear fuel pellets in the lower layer from falling from the positioning groove port during the carrying or moving of the tray, and play a blocking role.

[0033] 5、By setting the information identification area to record the information of each tray, the subsequent search and storage are facilitated.

[0034] 6、The present application has the advantages of simple structure, stackability, high hardness, light weight, corrosion resistance, high temperature resistance, long service life of the product, small deformation coefficient, convenient carrying and storage. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0036] Figure 2 It is a schematic diagram of the structure of the bearing disc body in the present application;

[0037] Figure 3 It is a schematic diagram of the structure of the reinforcing body in the present application;

[0038] Figure 4 It is a relationship diagram of two trays stacked in the present application;

[0039] Figure 5 It is Figure 4 the plan view shown;

[0040] Figure 6 It is Figure 5 the sectional view at A-A in

[0041] Figure 7 It is Figure 5 the sectional view at B-B in DETAILED DESCRIPTION

[0042] The principles and characteristics of the present application are described below in combination with the drawings, and the examples are only used to explain the present application, and are not used to limit the scope of the present application.

[0043] In the nuclear fuel assembly industry, fuel pellets need to be stored and transferred by a tray after production, and the commonly used tray is a single-layer corrugated plate structure. When storing the pellets, the tray has poor rigidity and deforms during use. Moreover, the single-layer corrugated plate structure cannot be stacked, and a special tray cabinet is required for storage, which makes the storage and transfer of the pellets unable to be automated. To solve the above problems, a special tray for nuclear fuel pellets and a manufacturing process thereof are provided.

[0044] The present application provides the following preferred embodiments

[0045] As shown in Figure 1 and Figure 4 , a special tray for nuclear fuel pellets 40 includes a bearing disc body 10 made of stainless steel material and a reinforcing body 20 made of stainless steel material. The shapes of the bearing disc body 10 and the reinforcing body 20 are integrally formed by stamping, and the reinforcing body 20 is welded to the bottom of the bearing disc body 10. A plurality of bearing disc bodies 10 can be stacked and placed, and the bearing capacity of the bearing disc body 10 is enhanced by the reinforcing body 20 to prevent deformation. It should be noted that the bearing disc body 10 and the reinforcing body 20 can also be made of other metal materials, and in other embodiments, the bearing disc body 10 and the reinforcing body 20 can also be made of non-metal materials.

[0046] As shown in Figure 2 , the bearing disc body 10 is mainly used for loading nuclear fuel pellets 40. The bearing disc body 10 is arranged along the X-axis direction and has a plurality of positioning grooves 101 extending along the Y-axis direction. The bottom of the positioning groove 101 is in contact with a part of the reinforcing body 20. Each positioning groove 101 has two ends penetrating through, and one end of the positioning groove 101 is formed with a stop block 102. When the nuclear fuel pellet 40 is pushed into the positioning groove 101 from the other end, the nuclear fuel pellet 40 is gradually pushed towards the stop block 102, and the stop block 102 prevents the frontmost nuclear fuel pellet 40 from falling out of the positioning groove 101. The outer side wall of the stop block 102 is in the same plane as the outer side wall of the bearing disc body 10, the inner side wall of the stop block 102 is gradually inclined from the top to the bottom, and the height of the stop block 102 is lower than the height of the positioning groove 101. The inner side wall of the stop block 102 is inclined to form a gap between the end face of the stop block 102 and the end face of the frontmost nuclear fuel pellet 40, so that the nuclear fuel pellet 40 can be pushed through the gap during subsequent material taking. Moreover, the height of the stop block 102 is set to be lower than the height of the positioning groove 101, so that the positioning groove 101 at the end of the stop block 102 has a space for gas flow when stacked.

[0047] Further, in order to improve the air flow between the positioning groove 101 and the nuclear fuel pellet 40, the two opposite side walls 1011 of the positioning groove 101 are gradually connected from top to bottom to form an upper V-shaped connecting part 1012, and the two adjacent side walls 1011 of two adjacent positioning grooves 101 are gradually away from each other from top to bottom, and the top of the two adjacent side walls 1011 are connected to form a lower V-shaped connecting part 1013. When loading the nuclear fuel pellet 40, the two opposite side walls 1011 of the positioning groove 101 support the edge of the nuclear fuel pellet 40. Since the two side walls 1011 are gradually connected from top to bottom, a gap is formed between the bottom of the nuclear fuel pellet 40 and the upper V-shaped connecting part 1012. Through this arrangement, a gap for ventilation is formed between the positioning groove 101 and the nuclear fuel pellet 40, so as to facilitate the air flow during subsequent baking or storage.

[0048] In the embodiment, since the two opposite side walls 1011 of the positioning groove 101 are gradually connected from top to bottom, and in order to avoid the nuclear fuel pellet 40 being tightly clamped in the positioning groove 101, the position of the contact surface of the nuclear fuel pellet 40 contacting the two side walls 1011 is less than the maximum outer diameter of the nuclear fuel pellet 40. Since the nuclear fuel pellet 40 is a cylindrical block, the contact between the nuclear fuel pellet 40 and the two side walls 1011 is an arc surface contact. Without external force to extrude the two side walls 1011 into the positioning groove 101, the two side walls 1011 can well clamp the nuclear fuel pellet 40 and also can well push the nuclear fuel pellet 40 to move in the positioning groove 101. Further, in other embodiments, the position of the contact surface of the nuclear fuel pellet 40 contacting the two side walls 1011 is the maximum outer diameter of the nuclear fuel pellet 40.

[0049] As Figures 3 to 7As shown, the reinforcing body 20 is mainly used to reinforce the load-bearing strength of the load-bearing disc body 10, prevent the load-bearing disc body 10 from bending or deforming, and has a protruding portion 201 protruding towards the positioning groove 101. The reinforcing body 20 with the protruding portion 201 is arranged so that a hollow area is formed in the middle of the reinforcing body 20, which reduces the weight of the tray and can avoid the upper tray extruding the nuclear fuel pellets 40 in the lower layer; the protruding portion 201 is staggered along the Y-axis direction and has upper protruding portions 202 and lower protruding portions 203 extending along the X-axis direction. The upper protruding portions 202 have an inverted N-shaped cross section, and the lower protruding portions 203 have an N-shaped cross section. The upper protruding portions 202 are in contact with the lower V-shaped connecting portion 1013. By staggered arranging the upper protruding portions 202 and the lower protruding portions 203 on the reinforcing body 20, the strength of the reinforcing body 20 is increased, and the directions of the upper protruding portions 202 and the lower protruding portions 203 are perpendicular to the direction of the positioning groove 101. When the load-bearing disc body 10 carries the nuclear fuel pellets 40, the upper protruding portions 202 and the lower protruding portions 203 can effectively prevent the tray from bending and deforming during the loading process. The upper protruding portions 202 are arranged along the X-axis and have airflow flow positions composed of a plurality of through grooves 2021. The through grooves 2021 are located below the upper V-shaped connecting portion 1012, and the width of the through grooves 2021 is greater than or less than the width of the upper V-shaped connecting portion 1012, so as to facilitate the airflow during subsequent baking or storage.

[0050] Further, in order to enable the trays to be stacked with each other for storage or transportation, the load-bearing disc body 10 has reinforcing portions 103 on the opposite two outer sides, and the reinforcing portions 103 are in the same plane as the top of the lower V-shaped connecting portion 1013. The reinforcing body 20 has a fixing portion 204 arranged around the protruding portion 201, and the fixing portion 204 is connected with the load-bearing disc body 10. The reinforcing portions 103 and the fixing portion 204 are provided with positioning portions 30. When the load-bearing disc body 10 is stacked, the positioning portion 30 on the load-bearing disc body 10 of the lower layer is inserted into the positioning portion 30 on the reinforcing body 20 of the upper layer. By arranging the positioning portions 30 on the load-bearing disc body 10 and the reinforcing body 20, when the load-bearing disc body 10 is stacked, the positioning portion 30 on the load-bearing disc body 10 of the lower layer is inserted into the positioning portion 30 on the reinforcing body 20 of the upper layer, so that a plurality of trays can be stacked with each other, thereby facilitating the storage and turnover of the trays.

[0051] Specifically, the positioning portion 30 is a hollow conical protrusion. The hollow diameter of the positioning portion 30 on the reinforcing portion 103 is slightly smaller than the hollow diameter of the positioning portion 30 on the fixing portion 204, so that the positioning portion 30 on the load-bearing disc body 10 of the lower layer can be inserted into the positioning portion 30 on the reinforcing body 20 of the upper layer. In this way, the stacked trays will not move relative to each other during transportation, thereby avoiding the problem of falling.

[0052] As shown in FIG. 1, the tray 1 comprises a load-bearing disc body 10 and a reinforcing body 20. The load-bearing disc body 10 is arranged in a circular disc shape, and has a positioning groove 101 arranged on the outer side of the load-bearing disc body 10. The reinforcing body 20 is arranged on the load-bearing disc body 10, and has a protruding portion 201 protruding towards the positioning groove 101. The reinforcing body 20 with the protruding portion 201 is arranged so that a hollow area is formed in the middle of the reinforcing body 20, which reduces the weight of the tray and can avoid the upper tray extruding the nuclear fuel pellets 40 in the lower layer. Figure 7As shown, the fixed part 204 includes a set of vertical edges 2041 arranged on opposite sides of the protruding part 201 and perpendicular to the protruding part 201, and a set of horizontal connecting edges 2042 connected with the set of vertical edges 2041 and in contact with the surface of the lower carrier tray body 10; the horizontal connecting edges 2042 on one side of the set of vertical edges 2041 are respectively formed with welding edges 2043, and the positioning part 30 is arranged on the horizontal connecting edges 2042 between the vertical edges 2041 and the welding edges 2043, the height of the vertical edges 2041 is greater than the height of the lower protruding part 203, the welding edges 2043 are in contact with the inner side edges of the carrier tray body 10, and the welding edges 2043 are welded to fix the reinforcing part 103 and the carrier tray body 10; the horizontal connecting edges 2042 are arranged to facilitate smooth contact between the horizontal connecting edges 2042 and the lower carrier tray body 10 when the trays are stacked.

[0053] The fixed part 204 also includes a geometric positioning structure for preventing the lower carrier tray body 10 from discharging the nuclear fuel pellets 40 from the positioning groove 101, the geometric positioning structure is provided with a set of inclined blocking edges 2044 arranged adjacent to the set of vertical edges 2041 and connected with the protruding part 201 and the horizontal connecting edges 2042, the inclined blocking edges 2044 gradually incline outward along the horizontal connecting edges 2042 from the protruding part 201; the horizontal connecting edges 2042 on one side of the set of inclined blocking edges 2044 are respectively formed with lifting edges 2045, the lifting edges 2045 are formed with a hand lifting groove and a mechanical lifting groove 2046 recessed towards the inclined blocking edges 2044, and the side wall 1011 of the carrier tray body 10 is provided with a notch matching the hand lifting groove and the mechanical lifting groove 2046, the hand lifting groove and the mechanical lifting groove 2046 are arranged to facilitate manual or mechanical handling; the height of the inclined blocking edges 2044 is greater than the height of the lower protruding part 203, and welding edges 2043 lower than the lifting edges 2045 are formed on both sides of the lifting edges 2045, and the welding edges 2043 are welded with the carrier tray body 10; the height of the inclined blocking edges 2044 is greater than the height of the lower protruding part 203 and equal to the height of the vertical edges 2041, the arrangement of the inclined blocking edges 2044 can avoid the entire end surface of the nuclear fuel pellets 40 contacting the inclined blocking edges 2044, thereby avoiding scratching the nuclear fuel pellets 40; the above arrangement of the fixed part 204 can achieve geometric limiting effect, prevent the lower nuclear fuel pellets 40 from falling out of the positioning groove 101 during handling or moving the tray, and achieve blocking effect.

[0054] In order to record the information of each tray, so as to facilitate subsequent retrieval, an information identification area 1031 is arranged on the side edges of the two reinforcing parts 103, the information identification area 1031 includes a groove arranged on the side wall of the reinforcing part 103, and a two-dimensional code is arranged in the groove, the corresponding data such as the model, specification, weight, and the number of stored nuclear fuel pellets 40 of the tray can be read or input by scanning the two-dimensional code.

[0055] Preferably, in order to avoid scratching the nuclear fuel pellets 40 loaded in the tray, the surface of the carrier disc body 10 is polished, that is, the surfaces of the two side walls 1011, the upper V-shaped connecting part 1012 and the lower V-shaped connecting part 1013 are polished to be mirror surfaces, so as to prevent the problem that the low smoothness of the surface of the carrier disc body 10 causes scratching of the nuclear fuel pellets 40 when the nuclear fuel pellets 40 move.

[0056] In summary, the application also provides a manufacturing process of the tray special for the nuclear fuel pellets 40, and the manufacturing steps are as follows:

[0057] S1, cutting: using laser cutting to cut the stainless steel plate into a sheet suitable for stamping; in addition, before cutting, the surface of the stainless steel plate needs to be cleaned to remove dust or large particles on the surface of the stainless steel plate, so as to avoid scratching the stainless steel plate during cutting and conveying;

[0058] S2, pretreatment: cleaning the surface of the punched sheet in S1 to remove oil stains, dust and other impurities, so as to ensure the stamping quality; after cleaning, lubricant is applied on the surface of the sheet to reduce friction during stamping and improve the service life of the die;

[0059] S3, forming of upper and lower plates: using a special stamping die, the sheet treated in S2 is pressed into the inner cavity of the die by a press machine to form the required disc structure; the upper and lower plates can be formed by multiple deep drawing to obtain the carrier disc body 10 and the reinforcing body 20;

[0060] S4, laser welding: placing the carrier disc body 10 and the reinforcing body 20 obtained in S3 into a special welding jig, and using an automatic laser welding machine to weld the carrier disc body 10 and the reinforcing body 20, so as to obtain the tray special for the nuclear fuel pellets 40;

[0061] S5, edge trimming / deburring: removing the excess material at the edge of the tray special for the nuclear fuel pellets 40 obtained in S4 by an edge trimming die to ensure smooth edge, and deburring the tray to improve the hand feeling and safety of the product;

[0062] S6, shaping: making the final detail adjustment to the basically formed tray special for the nuclear fuel pellets 40 to ensure the size accuracy and the shape meeting the design requirements;

[0063] S7, polishing: polishing the tray special for the nuclear fuel pellets 40 to make the surface of the tray special for the nuclear fuel pellets 40 a mirror surface, so as to ensure that the tray special for the nuclear fuel pellets 40 does not scratch the nuclear fuel pellets 40 when the nuclear fuel pellets 40 are loaded into or unloaded from the tray;

[0064] S8, cleaning and inspection: cleaning the polished tray special for the nuclear fuel pellets 40 to remove the oil stains and impurities possibly generated during stamping, and performing quality inspection to check whether the tray special for the nuclear fuel pellets 40 has defects such as cracks, deformation and size deviation.

[0065] S9, two-dimensional code engraving: using laser marking machine to engrave two-dimensional code on both sides of the special tray of nuclear fuel pellets 40.

[0066] In summary, the application has the advantages of simple structure, simple manufacturing process, stackability, high hardness, light weight, corrosion resistance, high temperature resistance, long service life of the product, small deformation coefficient, convenient carrying and storage.

[0067] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A special feed tray for nuclear fuel pellets, characterized in that, It includes a stackable support plate and a reinforcing body located at the bottom of the support plate to prevent deformation of the support plate; The support plate has several positioning grooves arranged at intervals along the X-axis and extending along the Y-axis. The bottom of the positioning groove contacts a part of the reinforcing body. The opposite side walls of the positioning groove gradually approach each other from the top to the bottom to form an upper V-shaped connection. The adjacent side walls of two adjacent positioning grooves gradually move away from each other from the top to the bottom, and the top of the adjacent side walls connect to form a lower V-shaped connection. When loading nuclear fuel pellets, the opposite side walls of the positioning grooves support the edge of the nuclear fuel pellets, so that a gap is formed between the nuclear fuel pellets and the upper V-shaped connection. The reinforcing body has a protruding part that protrudes towards the positioning groove. The protruding part is provided with an upper protrusion and a lower protrusion that extend along the X-axis in an alternating manner along the Y-axis. The upper protrusion contacts the lower V-shaped connecting part. The upper protrusion is provided with airflow positions along the X-axis. The bearing plate has reinforcing parts on both outer sides, and the top of the reinforcing parts and the lower V-shaped connecting parts are on the same plane; the reinforcing body has a fixing part arranged around the protruding part, and the fixing part is connected to the bearing plate; the reinforcing part and the fixing part are respectively provided with positioning parts, and when the bearing plates are stacked, the positioning part at the lower bearing plate is inserted into the positioning part at the upper reinforcing body; An information identification area is provided on the side of the reinforced section; The fixing part includes a set of vertical edges located on opposite sides of the protrusion and perpendicular to the protrusion, and a horizontal connecting edge connected to the set of vertical edges and in contact with the surface of the lower support plate. Welded edges are formed on the horizontal connecting edges on one side of the set of vertical edges, and the height of the vertical edges is greater than the height of the lower protrusion. The fixing part also includes a geometric positioning structure for preventing the nuclear fuel pellets held in the lower support plate from exiting the positioning slot. The geometric positioning structure has a set of inclined baffles adjacent to the set of vertical edges and connected to the protrusion and the horizontal connecting edges. The inclined baffles gradually slope outwards from the protrusion along the horizontal connecting edges. Handle edges are formed on the horizontal connecting edges on one side of the set of inclined baffles. The handle edges have a recessed hand-carrying groove and a mechanical lifting groove, and the side wall of the support plate has a notch that matches the hand-carrying groove and the mechanical lifting groove. The height of the inclined baffles is greater than the height of the lower protrusion and is equal to the height of the vertical edges. Several through slots are arranged in the airflow area. The information identification area includes a groove on the side wall of the reinforcing part, and a QR code is placed in the groove.

2. The nuclear fuel pellet special feed tray according to claim 1, characterized in that, Each positioning groove has a stop block formed at one end. The outer wall of the stop block is on the same plane as the outer wall of the bearing plate. The inner wall of the stop block gradually slopes from top to bottom, and the height of the stop block is lower than the height of the positioning groove.

3. The nuclear fuel pellet special feed tray according to claim 1, characterized in that, The positioning part is located on the horizontal connecting edge between the vertical edge and the welding edge, and the positioning part is a hollow conical protrusion.

4. The nuclear fuel pellet special feed tray according to claim 1, characterized in that, The surface of the support plate is mirror-like.

5. The nuclear fuel pellet special feed tray according to claim 1, characterized in that, The bearing plate is made of stainless steel and is formed by one-piece stamping. The reinforcing body is also made of stainless steel and is formed by one-piece stamping.

6. A manufacturing process for a special fuel tray for nuclear fuel pellets as described in any one of claims 1-5, characterized in that, The production steps are as follows: S1. Cutting: Using laser cutting, stainless steel sheets are cut into sheets suitable for stamping; S2. Pre-treatment: Clean the surface of the sheet material punched in S1 to remove oil stains, dust and impurities. After cleaning, apply lubricant to the surface of the sheet material. S3. Upper and lower plate forming: Using a special stamping die, the sheet material processed in S2 is pressed into the inner cavity of the die by a press to form the required disc-shaped structure. The upper and lower plates can be formed by multiple deep drawing processes to obtain the load-bearing disc body and the reinforcing body. S4. Laser welding: The carrier plate and the reinforcing body obtained in S3 are placed in a special welding fixture, and the carrier plate and the reinforcing body are welded together using an automatic laser welding machine to obtain the special material tray for nuclear fuel pellets. S5. Trimming / Deburring: The trimming die removes excess material from the edge of the nuclear fuel pellet tray made in S4, ensuring a smooth edge and deburring the tray to improve the product's feel and safety. S6. Shaping: Make final adjustments to the special material trays for nuclear fuel pellets that have been basically formed to ensure that the dimensions are accurate and the shape meets the design requirements. S7. Polishing: Polish the special tray for nuclear fuel pellets to make the surface of the special tray for nuclear fuel pellets mirror-like, ensuring that the special tray for nuclear fuel pellets will not be scratched when nuclear fuel pellets are moved in and out. S8. Cleaning and Inspection: Clean the polished nuclear fuel pellet trays to remove oil and impurities that may have been generated during the stamping process. Conduct quality inspection to check whether the nuclear fuel pellet trays have cracks, deformations, or dimensional deviations. S9. QR code engraving: A laser engraving machine is used to engrave QR codes on both sides of the special tray for nuclear fuel pellets.

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