A proportioning device for producing high-purity boron carbide ceramic pellets for nuclear use

Abstract

The utility model discloses a kind of proportioning device for production of high-purity boron carbide ceramic core block for nuclear, the utility model relates to nuclear industry material preparation technical field.It is including tank body device, further include: conveying mixing device, the inner wall of tank body device is rotatably connected with the outer wall of conveying mixing device both ends, the outside of conveying mixing device is equipped with stirring and mixing assembly, the stirring and mixing assembly includes mixing pipe, the outer wall of the mixing pipe is through and is equipped with discharge port, the outer wall fixedly connected with stirring stick of the mixing pipe in discharge port misplacement, by shunt conveying, avoid raw material in advance non-expected mixing, ensure that each component is introduced according to preset ratio, again, preliminary shearing stirring, mixing bump secondary disturbance of screw rod, and wave plate pipe inside disturbance driven by mixing pipe linkage, stirring stick all-around agitation, short stirring stick including adhering tank body inner wall reduces dead angle, cooperate material in mixing pipe inside and outside circulation reflux, form multilevel, closed loop mixing mode.

Description

Technical Field

[0001] This utility model relates to the field of nuclear industry material preparation technology, specifically a proportioning device for the production of high-purity boron carbide ceramic cores for nuclear applications. Background Technology

[0002] Traditional mixing devices often use a single ball mill or stirring structure to formulate the production ratio of high-purity boron carbide ceramic pellets. Due to the agglomeration of material particles and density differences, component stratification and local enrichment are prone to occur, resulting in deviations in the distribution of boron and carbon elements that exceed the allowable range. This directly affects the consistency of neutron absorption efficiency in the pellets and may even cause local power anomalies in the reactor. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a proportioning device for the production of high-purity boron carbide ceramic cores for nuclear applications, which solves the problem of insufficient mixing uniformity.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a proportioning device for producing high-purity boron carbide ceramic cores for nuclear applications, comprising a tank body and a conveying and mixing device. The inner wall of the tank body is rotatably connected to the outer walls at both ends of the conveying and mixing device. A stirring and mixing assembly is fitted around the outside of the conveying and mixing device. The stirring and mixing assembly includes a mixing pipe with a discharge port extending through its outer wall. A stirring rod is fixedly connected to the outer wall of the mixing pipe, offset from the discharge port. A heating rod is fixedly connected to the inner wall of the stirring rod. A corrugated plate is fixedly connected to the inner wall of the mixing pipe. The device utilizes a conveying and mixing assembly... The combined structure of the mixing device and the mixing assembly allows for simultaneous mixing of materials during the conveying process, simplifying the overall process flow. The corrugated plates in the mixing assembly enhance the agitation of materials within the pipe, and together with the external stirring of the stirring rollers, prevent material accumulation or agglomeration, improving the overall mixing. The heating rollers work in tandem with the stirring action to uniformly heat the materials during mixing, helping to break up adhesion between material particles and preventing adverse changes caused by localized overheating, thus ensuring the high purity of the materials and meeting the basic requirements for material proportioning and mixing in the production of high-purity boron carbide ceramic cores for nuclear applications.

[0007] Preferably, the outlet and stirring rollers are arranged around the mixing pipe as the axis, with the stirring rollers at both ends of the mixing pipe being shorter than those in the middle to fit the inner wall of the tank. The corrugated plates on the inner wall of the mixing pipe are arranged in a ring around the center line of the mixing pipe, and the corrugated plates are staggered with the outlet. This ring arrangement of the outlet and stirring rollers ensures the uniformity of material mixing in the circumferential direction, avoiding localized incomplete mixing. The length of the stirring rollers at both ends is adapted to the inner wall of the tank, reducing dead zones and ensuring that the material in the inner edge area of ​​the tank is fully mixed, thus improving the overall mixing effect. The staggered arrangement of the corrugated plates and the outlet extends the flow path of the material in the mixing pipe, increases the contact opportunity between the material and the corrugated plates, further enhances the disturbance effect, and avoids the outlet being blocked by material, ensuring smooth operation of the device and helping to improve the consistency of material mixing, meeting the requirements for the production of high-purity nuclear materials.

[0008] Preferably, the conveying and mixing device includes two conveying pipes, each with a mixing pipe running through its inner wall. A screw rod is rotatably connected to the inner wall of each mixing pipe, and a mixing protrusion is fixedly connected to the outer wall of each mixing pipe. A heating block is fixedly connected to the inner wall of the mixing protrusion, and an outlet hole is provided through the outer wall of each mixing pipe. The two conveying pipes allow for the separate conveying of different raw materials, avoiding pre-mixing and ensuring accurate proportions. The rotation of the screw rod achieves both material conveying and preliminary mixing, enabling the conveying and mixing processes to work together and improving production efficiency. The mixing protrusion enhances the agitation of the material, and with the auxiliary heating of the heating block, it breaks up particle agglomeration, promoting the initial fusion of different raw material components. The outlet hole ensures smooth material discharge, laying the foundation for subsequent deep mixing. The overall structure integrates raw material conveying, preliminary mixing, and heating, helping to ensure high purity and effective mixing of materials.

[0009] Preferably, the mixing protrusions and the outlet holes are staggered, and both the mixing protrusions and the outlet holes are arranged around the centerline of the mixing pipe. The outer wall of the mixing pipe is fixedly connected to the inner wall of the tank device. The spiral rod has a pre-reserved connection head for connecting to external equipment on the outer wall of the mixing pipe and the tank device. The outer wall of the spiral rod is fixedly connected to the inner wall of the mixing pipe. When the spiral rod rotates, it can drive the mixing pipe to rotate synchronously. The staggered arrangement of the mixing protrusions and the corrugated plate, and the staggered arrangement of the mixing protrusions and the outlet holes, ensure both smooth material discharge and good mixing effect. The surrounding arrangement achieves all-round coverage. To prevent material from being missed, the fixed connection between the mixing pipe and the tank enhances the stability of the overall structure and improves the reliability of the device operation. The linkage between the screw and the mixing pipe allows for simultaneous conveying, preliminary mixing, and deep stirring, simplifying the drive structure, improving operating efficiency, and avoiding coordination errors caused by multiple equipment drives. The staggered arrangement of the mixing protrusions and corrugated plates avoids interference between components and achieves double stirring inside and outside, further enhancing the uniformity of material mixing. This helps improve the raw material ratio accuracy and mixing effect in the production of high-purity boron carbide ceramic cores for nuclear applications, ensuring the performance stability of the final product.

[0010] (III) Beneficial Effects

[0011] This invention provides a proportioning device for the production of high-purity boron carbide ceramic cores for nuclear applications. It offers the following advantages:

[0012] (i) The mixing device for producing high-purity boron carbide ceramic cores for nuclear use avoids premature and unintended mixing of raw materials by means of branch conveying, ensuring that each component is introduced in a preset ratio, and then undergoes preliminary shearing and stirring by a screw rod, secondary disturbance by mixing protrusions, and disturbance inside the corrugated plate tube driven by the mixing pipe, and all-round stirring by the stirring roller. The short stirring roller attached to the inner wall of the tank reduces dead corners, and with the circulation and reflux of materials inside and outside the mixing pipe, a multi-level, closed-loop mixing mode is formed to improve the fusion consistency of different raw material components.

[0013] (ii) The proportioning device for producing high-purity boron carbide ceramic cores for nuclear use, through the coordinated and gentle heating of the heating block and the heating rod, can not only break up the agglomeration and adhesion of material particles, but also avoid adverse changes in materials caused by local overheating, thus ensuring the high purity and uniformity of materials required for the production of boron carbide ceramic cores for nuclear use throughout the process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3This is a schematic diagram of the structure of the mixing and stirring assembly of this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the mixing and blending assembly of this utility model;

[0018] Figure 5 This is a structural schematic diagram of the cross-section of the conveying and mixing device of this utility model.

[0019] In the diagram: 1. Tank assembly; 2. Conveying and mixing device; 21. Conveying pipe; 22. Mixing pipe; 23. Mixing protrusion; 24. Heating block; 25. Screw rod; 26. Outlet; 3. Mixing and stirring assembly; 31. Mixing pipe; 32. Discharge port; 33. Stirring roller; 34. Heating roller; 35. Corrugated plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 Figure 1 illustrates a technical solution for a proportioning device used in the production of high-purity boron carbide ceramic cores for nuclear applications. The device includes a tank 1 and a conveying and mixing device 2. The inner wall of the tank 1 is rotatably connected to the outer walls at both ends of the conveying and mixing device 2. A stirring and mixing assembly 3 is fitted around the outside of the conveying and mixing device 2. The stirring and mixing assembly 3 includes a mixing pipe 31, with an outlet 32 ​​extending through its outer wall. A stirring rod 33 is fixedly connected to the outer wall of the mixing pipe 31, offset from the outlet 32. A heating rod 34 is fixedly connected to the inner wall of the stirring rod 33. A corrugated plate 35 is fixedly connected to the inner wall of the mixing pipe 31.

[0022] The outlet 32 ​​and the stirring rod 33 are arranged around the mixing pipe 31 as the axis. The stirring rods 33 at both ends of the mixing pipe 31 are shorter than those in the middle so as to fit the inner wall of the tank device 1. The corrugated plate 35 on the inner wall of the mixing pipe 31 is arranged in a ring around the center line of the mixing pipe 31. The corrugated plate 35 is staggered with the outlet 32.

[0023] The conveying and mixing device 2 includes a conveying pipe 21, and two conveying pipes 21 are provided. A mixing pipe 22 is connected through the inner wall of each conveying pipe 21. A screw rod 25 is rotatably connected to the inner wall of the mixing pipe 22. A mixing protrusion 23 is fixedly connected to the outer wall of the mixing pipe 22. A heating block 24 is fixedly connected to the inner wall of the mixing protrusion 23. An outlet hole 26 is opened through the outer wall of the mixing pipe 22.

[0024] The mixing protrusions 23 and the outlet 26 are staggered and arranged around the center line of the mixing pipe 31. The outer wall of the mixing pipe 22 is fixedly connected to the inner wall of the tank device 1. The screw rod 25 is located on the outer wall of the mixing pipe 22 and the tank device 1 and has a connection head for connecting to external equipment. The outer wall of the screw rod 25 is fixedly connected to the inner wall of the mixing pipe 31. When the screw rod 25 rotates, it can drive the mixing pipe 31 to rotate synchronously. The mixing protrusions 23 and the corrugated plate 35 are staggered.

[0025] During use, the raw materials are transported separately and initially introduced. After the device is started, the different raw material components required for the production of boron carbide core blocks are transported separately through two independently set conveying pipes 21. This separate conveying avoids the raw materials from coming into contact with each other before entering the mixing stage and causing unintended mixing. It ensures that each component is introduced into the subsequent mixing structure according to the preset ratio, laying the foundation for the ratio. The raw materials flow smoothly into the mixing pipe 22 that is connected to the conveying pipe 21, completing the initial feeding process.

[0026] In the process of preliminary mixing and auxiliary heating, after the raw materials enter the mixing tube 22 inside the conveying and mixing device 2, the spiral rod 25, which is rotatably connected to the inner wall of the mixing tube 22, starts to rotate under the drive of the external driving equipment and the pre-reserved connector of the spiral rod 25. The rotation of the spiral rod 25 provides the power for forward conveying of the material, pushing the material to flow axially along the mixing tube 22. On the other hand, the spiral structure forms a shearing and stirring effect on the material inside the tube, realizing the preliminary fusion of different raw material components. At the same time, the mixing protrusion 23 fixed on the outer wall of the mixing tube 22 moves synchronously with the mixing tube 22, forming a secondary disturbance on the material in the outer area of ​​the mixing tube 22, further breaking up the material agglomeration. The heating block 24 on the inner wall of the mixing protrusion 23 releases heat synchronously. The heat is transferred to the material inside and outside through the mixing protrusion 23 and the tube wall of the mixing tube 22, gently heating the material to break the adhesion between particles and creating conditions for subsequent deep mixing. The material that has undergone preliminary mixing and heating is discharged through the outlet 26 opened on the outer wall of the mixing tube 22 and enters the mixing tube 31 of the stirring and mixing assembly 3.

[0027] Deep mixing and enhanced circulation disturbance: After the material enters the mixing pipe 31, the outer wall of the screw rod 25 is fixedly connected to the inner wall of the mixing pipe 31. When the screw rod 25 rotates, it will drive the mixing pipe 31 to rotate synchronously, realizing the linkage of conveying and deep mixing. The corrugated plate 35 on the inner wall of the mixing pipe 31 rotates with the pipe body, forming a continuous disturbance on the material inside the pipe, changing the material flow direction and speed, extending the flow path of the material in the pipe, and promoting full contact between different components. At the same time, the stirring rods 33, which are staggered on the outer wall of the mixing pipe 31 and the outlet 32, rotate synchronously with the pipe body, stirring the material outside the mixing pipe 31 and inside the tank device 1 in all directions, covering most of the area inside the tank. Among them, the stirring rods 33 with shorter lengths at both ends of the mixing pipe 31 can rotate close to the inner wall of the tank device 1, effectively stirring the material in the edge area and reducing the stirring dead corners. The stirring rods 33 in the middle position cover the material area in the middle of the tank, forming a stirring coverage without dead corners.

[0028] Heating synergy with material circulation mixing: During deep mixing, the heating rod 34 on the inner wall of the stirring rod 33 continuously releases heat, which synergizes with the heat from the heating block 24 on the mixing tube 22 to uniformly heat the materials inside the tank device 1 and inside and outside the mixing tube 31. This heating method avoids temperature unevenness caused by a single heating point. The gentle heat can further break up the agglomeration and adhesion between material particles, while avoiding local overheating of the material and causing adverse changes, thus ensuring the high purity of the material. In addition, the outlet 32 ​​on the outer wall of the mixing tube 31 realizes the circulation of material inside and outside the mixing tube 31 during the rotation of the tube. Some material is discharged into the tank through the outlet 32, mixed with the external material under the stirring of the stirring rod 33, and then re-enters the mixing tube 31 with the material flow, forming a closed-loop mixing mode of in-tube disturbance to out-of-tube stirring and recirculation, which improves the mixing uniformity.

[0029] Structural adaptation and operational stability are ensured by the staggered arrangement of components, such as the mixing protrusion 23 and the outlet 26, the corrugated plate 35 and the outlet 32, and the mixing protrusion 23 and the corrugated plate 35. This avoids interference between components during operation and ensures smooth material flow and discharge, preventing the outlet 32 ​​or outlet 26 from being blocked by material. The outer wall of the mixing pipe 22 is fixedly connected to the inner wall of the tank device 1, providing stable support for the entire linkage structure and preventing shaking or displacement during operation. The tank device 1 provides a closed environment for the entire mixing process, preventing external impurities from entering the material and ensuring the high purity requirements of nuclear materials.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A proportioning device for producing high-purity boron carbide ceramic cores for nuclear applications, comprising a tank device (1), characterized in that, Also includes: The inner wall of the tank device (1) is rotatably connected to the outer walls at both ends of the conveying and mixing device (2), and the outside of the conveying and mixing device (2) is fitted with a stirring and mixing assembly (3). The mixing assembly (3) includes a mixing pipe (31), the outer wall of which is provided with an outlet (32), a stirring rod (33) is fixedly connected to the outer wall of the mixing pipe (31) at the outlet (32), a heating rod (34) is fixedly connected to the inner wall of the stirring rod (33), and a corrugated plate (35) is fixedly connected to the inner wall of the mixing pipe (31).

2. The proportioning device for producing high-purity boron carbide ceramic cores for nuclear applications according to claim 1, characterized in that: The outlet (32) and stirring rod (33) are arranged around the mixing pipe (31) as the axis. The stirring rods (33) at both ends of the mixing pipe (31) are shorter than those in the middle so as to fit the inner wall of the tank device (1). The corrugated plate (35) on the inner wall of the mixing pipe (31) is arranged in a ring around the center line of the mixing pipe (31). The corrugated plate (35) is staggered with the outlet (32).

3. The proportioning device for producing high-purity boron carbide ceramic cores for nuclear applications according to claim 1, characterized in that: The conveying and mixing device (2) includes a conveying pipe (21), and there are two conveying pipes (21). The inner wall of each conveying pipe (21) is connected to a mixing pipe (22). The inner wall of the mixing pipe (22) is rotatably connected to a spiral rod (25). The outer wall of the mixing pipe (22) is fixedly connected to a mixing protrusion (23). The inner wall of the mixing protrusion (23) is fixedly connected to a heating block (24). The outer wall of the mixing pipe (22) is provided with an outlet hole (26).

4. The proportioning device for producing high-purity boron carbide ceramic cores for nuclear applications according to claim 3, characterized in that: The mixing protrusion (23) and the outlet (26) are staggered. The mixing protrusion (23) and the outlet (26) are arranged around the center line of the mixing pipe (31). The outer wall of the mixing pipe (22) is fixedly connected to the inner wall of the tank device (1). The spiral rod (25) is located on the outer wall of the mixing pipe (22) and the tank device (1) and has a connection head for connecting to external equipment. The outer wall of the spiral rod (25) is fixedly connected to the inner wall of the mixing pipe (31). When the spiral rod (25) rotates, it can drive the mixing pipe (31) to rotate synchronously. The mixing protrusion (23) and the corrugated plate (35) are staggered.

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