Mixing apparatus and mixing system for grain samples

Abstract

The application relates to the field of stirring and mixing of materials, and provides a mixing device and a mixing system for grain samples. The mixing device comprises a sample container provided with a closed cavity for accommodating samples; a mixing assembly arranged in the closed cavity and comprising a fixed shaft, a first dispersion plate and a second dispersion plate; the two ends of the fixed shaft are fixed to the inner side wall of the sample container, the first dispersion plate and the second dispersion plate are fixedly installed on the fixed shaft and are arranged in a staggered mode along the length direction of the fixed shaft; the first dispersion plate and the second dispersion plate are provided with through holes for the samples to pass through; the plane where the first dispersion plate is located and the plane where the second dispersion plate is located are both arranged in a non-perpendicular mode with the end face of the sample container, so that at least part of the samples pass through the first dispersion plate and the second dispersion plate when the sample container is overturned to make the samples fall. The mixing device for grain samples provided by the application can effectively reduce the time required for mixing the samples to a uniform state.

Description

Technical Field

[0001] This application relates to the field of material stirring and mixing, and more particularly to a mixing device and mixing system for grain samples. Background Technology

[0002] In grain quality inspection, when testing for food safety indicators such as mycotoxins, a certain mass of grain sample must first be pulverized and thoroughly mixed to ensure sample homogeneity and representativeness, thereby ensuring the accuracy and repeatability of test results. Currently, the powder sample mixing equipment commonly used in grain and oil testing laboratories has a core component that is a barrel-shaped receiving container. This container is completely empty inside. During use, the pulverized sample is loaded into the container, sealed, and then the container is rotated by external power to achieve sample mixing.

[0003] However, the existing barrel-shaped receiving container has significant shortcomings in its structural design: during container inversion, the sample can only undergo a simple overall tumbling motion, resulting in poor mixing of powdery grain samples. For samples requiring high homogeneity for mycotoxin detection, the structural defects can only be compensated for by extending the mixing time, leading to a significant time consumption for each sample mixing operation. This severely restricts the overall efficiency of grain quality testing and fails to meet the laboratory's actual need for rapid progress in the testing process. Utility Model Content

[0004] This application provides a mixing device for grain samples to solve the problems of poor mixing effect and low efficiency of existing mixing equipment, and to reduce the time required for the sample to be mixed to a uniform state.

[0005] This application also provides a mixing system.

[0006] A mixing apparatus for a grain sample according to a first aspect embodiment of this application, the mixing apparatus comprising: Sample container, which has a closed cavity for containing the sample; A mixing assembly, disposed within the enclosed cavity, includes a fixed shaft, a first dispersion plate, and a second dispersion plate. Both ends of the fixed shaft are fixed to the inner wall of the sample container. The first and second dispersion plates are fixedly mounted on the fixed shaft and staggered along its length. The first and second dispersion plates are provided with through holes for sample passage. The planes of the first and second dispersion plates are not perpendicular to the end face of the sample container, so that at least a portion of the sample passes through the first and second dispersion plates when the sample container is tilted and the sample falls.

[0007] According to one embodiment of this application, a first mounting plane is provided on the outer peripheral surface of the fixed shaft, a first connecting hole is provided on the first mounting plane, a first mating hole is provided on the first dispersing plate, and a fastener passes through the first connecting hole and the first mating hole to fix the first dispersing plate on the fixed shaft; A second mounting plane is provided on the outer circumferential surface of the fixed shaft, a second connecting hole is provided on the second mounting plane, a second mating hole is provided on the second dispersing plate, and fasteners are inserted into the second connecting hole and the second mating hole to fix the second dispersing plate on the fixed shaft; The first mounting plane and the second mounting plane are offset from each other along the length of the fixed shaft.

[0008] According to one embodiment of this application, on the first dispersion plate and the second dispersion plate, the through-hole density in the region near the middle position of the fixed shaft is lower than the through-hole density in the region near the inner sidewall of the sample container.

[0009] According to one embodiment of this application, the via is one or more of the following: circular hole, square hole, strip hole, and polygonal hole.

[0010] According to one embodiment of this application, the angle between the plane where the first dispersion plate is located and the end face of the sample container is 40° to 50°; The angle between the plane containing the second dispersion plate and the end face of the sample container is 40° to 50°.

[0011] According to one embodiment of this application, there is an angle between the plane where the first dispersion plate is located and the plane where the second dispersion plate is located, the angle being 80° to 100°.

[0012] According to one embodiment of this application, both the sample container and the mixing assembly are stainless steel components, and / or the fixing shaft is fixed to the inner wall of the sample container by welding.

[0013] According to one embodiment of this application, the sample container is a cylinder, and the first dispersion plate and the second dispersion plate are semi-circular plates.

[0014] According to one embodiment of this application, a first channel is provided between the edge of the first dispersion plate and the inner wall of the sample container; A second channel is provided between the edge of the second dispersion plate and the inner wall of the sample container.

[0015] According to a second aspect of this application, a mixing system for a grain sample is provided. The mixing system includes a driving mechanism and the aforementioned mixing device for the grain sample. The driving mechanism is used to drive the mixing device for the grain sample to rotate up and down.

[0016] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects: The mixing device for grain samples disclosed in this application improves the mixing uniformity of the sample during the sample container's tumbling process by incorporating mixing components within the sample container. Specifically, the first and second dispersing plates act as interceptors and blocks during sample descent, breaking up agglomerated clumps and enabling effective mixing while achieving the desired particle size. Furthermore, the first and second dispersing plates further de-disrupt the previously ordered sample movement, further enhancing the uniformity of sample mixing.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the mixing device for grain samples provided in this application. Figure 1 (3D view).

[0020] Figure 2 This is a schematic diagram of the structure of the mixing device for grain samples provided in this application. Figure 2 (Top view).

[0021] Figure 3 This is a schematic diagram of the structure of the mixing device for grain samples provided in this application. Figure 3 (Front view; dashed lines indicate perspective).

[0022] Figure 4 This is a schematic diagram of the fixed shaft provided in this application. Figure 1 .

[0023] Figure 5 This is a schematic diagram of the fixed shaft provided in this application. Figure 2 .

[0024] Figure 6 This is a schematic diagram of the structure of the first dispersion plate and the second dispersion plate provided in this application (the first dispersion plate and the second dispersion plate may have the same structure).

[0025] Figure 7 This is a schematic diagram of the structure of the sample container provided in this application. Figure 1 (Front view).

[0026] Figure 8 This is a schematic diagram of the structure of the sample container provided in this application. Figure 2 (Top view).

[0027] Figure 9 This is a schematic diagram of the structure of the mixing device for grain samples provided in this application. Figure 4 (Provide an angle diagram).

[0028] Figure label: 1. Sample container; 11. Enclosed cavity; 12. First channel; 13. Second channel; 2. Mixing assembly; 21. Fixed shaft; 211. First mounting plane; 212. First connecting hole; 213. Second mounting plane; 214. Second connecting hole; 22. First dispersing plate; 221. First mating hole; 23. Second dispersing plate; 231. Second mating hole; 24. Through hole. Detailed Implementation

[0029] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0030] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0032] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] According to an embodiment of the first aspect of this application, a mixing device for a grain sample is provided, such as... Figure 1 As shown, the mixing device includes: a sample container 1, which has a closed cavity 11 for containing the sample; and a mixing component 2, which is disposed in the closed cavity 11 and includes a fixed shaft 21, a first dispersing plate 22, and a second dispersing plate 23. The two ends of the fixed shaft 21 are fixed to the inner sidewall of the sample container 1. The first dispersing plate 22 and the second dispersing plate 23 are fixedly mounted on the fixed shaft 21 and are staggered along the length of the fixed shaft 21. The first dispersing plate 22 and the second dispersing plate 23 are provided with through holes 24 for the sample to pass through. The planes of the first dispersing plate 22 and the second dispersing plate 23 are not perpendicular to the end face of the sample container 1, so that at least part of the sample passes through the first dispersing plate 22 and the second dispersing plate 23 when the sample container 1 is flipped over and the sample falls.

[0035] The grain sample can be fine particles or powder. Sample container 1 can be a combination of a shell with an opening at the top and a lid. Figure 1 For clarity, only the shell portion of sample container 1 is shown; the top cover is not shown.

[0036] The closed cavity 11 of the sample container 1 can ensure that the sample will not leak during the mixing process, while maintaining the stability of the internal environment of the cavity and preventing external impurities from entering the cavity and contaminating the sample, thereby ensuring the accuracy of subsequent test results and meeting the requirements of grain quality inspection for sample cleanliness.

[0037] The fixed shaft 21 in the mixing assembly 2 is fixed at both ends to the inner wall of the sample container 1, providing a stable mounting base for the first dispersion plate 22 and the second dispersion plate 23. Even if the dispersion plate is subjected to an impact force during the sample falling, it can effectively prevent the dispersion plate from shifting or shaking, ensuring the structural stability of the entire mixing assembly 2 in long-term use and providing support for continuous and efficient sample mixing.

[0038] The first dispersion plate 22 and the second dispersion plate 23 are staggered along the length of the fixed axis 21, and the sample falls perpendicular to the length of the fixed axis 21. This arrangement ensures that when the sample container 1 is flipped, the falling sample can contact the two dispersion plates almost simultaneously, and the two dispersion plates act on the sample in different axial regions. Figure 3 As shown, the sample falls from the top to the bottom of sample container 1; then sample container 1 is flipped upside down, so that the sample that was originally at the bottom of sample container 1 falls to the top of sample container 1; this flipping is repeated multiple times.

[0039] Since the two dispersion plates are staggered along the length of the fixed axis 21, there will be no radial projection overlap. The falling sample will land on the first dispersion plate 22 or the second dispersion plate 23 respectively according to its axial position in the container. This avoids the problem that some axial areas of the sample cannot contact the dispersion structure due to the limited coverage of a single dispersion plate, and also prevents the two plates from stacking at the same axial position, causing sample accumulation. This ensures that samples in different axial areas in the container can be dispersed, achieving full coverage in the axial direction and eliminating axial mixing dead zones.

[0040] The planes containing the first dispersion plate 22 and the second dispersion plate 23 are not perpendicular to the end face of the sample container 1, ensuring that most of the sample passes through either the first dispersion plate 22 or the second dispersion plate 23 during its fall. Simultaneously, the non-perpendicular (i.e., inclined) first dispersion plate 22 guides the sample on its surface to diffuse towards one side of the container, while the second dispersion plate 23 guides the sample on its surface to diffuse towards the other side. The sample, which originally fell along a single radial direction, undergoes bidirectional disordered motion under the combined action of the two plates. The collision and interpenetration range between sample particles expands from radial to axial, further disrupting the ordered motion of the sample and significantly improving the mixing degree of samples from different regions. This effectively addresses the problem of unidirectional sample movement and uneven mixing caused by the vertical or axially overlapping of the dispersion plates.

[0041] The vias 24 on the first dispersion plate 22 and the second dispersion plate 23 allow a portion of the sample to pass through on their respective plates, preventing the dispersion plates from completely blocking the sample and preventing the sample from accumulating on the plate surface and affecting the mixing efficiency. On the other hand, when the sample passes through the vias 24, it will break up any remaining small agglomerates, so that the sample particle size reaches the level required for testing.

[0042] By setting the first dispersion plate 22 and the second dispersion plate 23, the dispersion range and disorder of the sample in the sample container 1 are significantly improved, and a uniform state can be achieved in a shorter time, reducing the mixing time and improving the overall efficiency of grain quality testing. At the same time, it ensures the representativeness of the sample and provides a reliable guarantee for the accuracy and repeatability of the test results of food safety indicators such as mycotoxins.

[0043] According to one embodiment of this application, such as Figure 4 and Figure 6 As shown, a first mounting plane 211 is provided on the outer peripheral surface of the fixed shaft 21, a first connecting hole 212 is provided on the first mounting plane 211, and a first mating hole 221 is provided on the first dispersing plate 22. Fasteners are inserted into the first connecting hole 212 and the first mating hole 221 to fix the first dispersing plate 22 onto the fixed shaft 21; Figure 5 and Figure 6 As shown, a second mounting plane 213 is provided on the outer peripheral surface of the fixed shaft 21, a second connecting hole 214 is provided on the second mounting plane 213, and a second mating hole 231 is provided on the second dispersing plate 23. Fasteners are inserted into the second connecting hole 214 and the second mating hole 231 to fix the second dispersing plate 23 on the fixed shaft 21. The first mounting plane 211 and the second mounting plane 213 are staggered in the length direction of the fixed shaft 21.

[0044] The outer circumferential surface of the fixed shaft 21 is provided with a first mounting plane 211 and a second mounting plane 213, providing a reference surface for the first dispersion plate 22 and the second dispersion plate 23 to fit against the fixed shaft 21. Compared with the arc-shaped outer circumferential surface of the fixed shaft 21, the planar structure can increase the contact area between the dispersion plate and the fixed shaft 21, so that the first dispersion plate 22 can be stably fitted against the first mounting plane 211 and the second dispersion plate 23 can be stably fitted against the second mounting plane 213. This reduces the gap between the dispersion plate and the fixed shaft 21, avoids the dispersion plate from shaking or tilting due to uneven force during sample mixing, ensures the structural stability of the dispersion plate under sample impact, and provides a foundation for continuous and stable sample dispersion and mixing.

[0045] The first connecting hole 212 on the first mounting plane 211 corresponds to the first mating hole 221 on the first dispersing plate 22, and the second connecting hole 214 on the second mounting plane 213 corresponds to the second mating hole 231 on the second dispersing plate 23. Fasteners are inserted therethrough for fixation. This connection method ensures that the relative position of the dispersing plate and the fixed shaft 21 remains unchanged through mechanical locking. Compared with non-removable connections such as welding, fastener connection facilitates the installation and removal of the dispersing plate. When the dispersing plate is worn or needs to be replaced with a dispersing plate with a different through-hole 24 structure to adapt to different samples, the replacement can be quickly completed by removing the fasteners, reducing maintenance costs and improving the flexibility and service life of the device.

[0046] The first mounting plane 211 and the second mounting plane 213 are staggered along the length of the fixed shaft 21, so that the first dispersion plate 22 and the second dispersion plate 23 are staggered on the fixed shaft 21. Simultaneously, the staggered mounting planes provide space for angle adjustment of the two plates, facilitating the setting of non-perpendicular angles between the first dispersion plate 22 and the second dispersion plate 23 and the end face of the sample container 1 according to mixing requirements. This avoids interference and ensures that the two plates exert optimal dispersion and guiding effects within their respective axial regions, further improving the uniformity of sample mixing.

[0047] According to one embodiment of this application, on the first dispersion plate 22 and the second dispersion plate 23, the through-hole density in the region near the middle position of the fixed shaft 21 is lower than the through-hole density in the region near the inner sidewall of the sample container 1 (not shown in the figure).

[0048] Near the inner wall of the sample container (1), a higher pore density provides more passageways for the sample in this area, preventing sample accumulation on the dispersion plate surface due to insufficient pores 24, and ensuring smooth material flow. Near the center of the fixed shaft 21, a lower pore density reduces the speed at which the sample passes through the dispersion plate, prolonging the contact time between the sample and the dispersion plate. This allows the dispersion plate to effectively intercept and disperse the sample, preventing it from passing through without proper dispersion due to excessive pores 24, thus ensuring the dispersion effect of the sample near the fixed shaft 21. By differentiating the pore density on the dispersion plate, the falling speed of the sample varies, resulting in better mixing of the sample.

[0049] This density distribution works synergistically with the staggered arrangement of the two plates along the length of the fixed axis 21. When the sample simultaneously contacts the first dispersion plate 22 and the second dispersion plate 23, the perforation density in different radial regions of the two plates guides the sample to form a more complex trajectory in both the radial and axial directions: samples near the inner wall of the shell can quickly enter the next region and mix with other samples after passing through the high-density perforations 24; samples near the middle of the fixed axis 21 pass slowly through the low-density perforations 24, allowing them to fully collide with subsequently falling samples. This differentiated material throughput rate enhances the turbulence of the sample within the container, reduces orderly flow, further improves the mixing effect, and helps the sample reach a homogeneous state in a shorter time.

[0050] According to one embodiment of this application, the via 24 is one or more of the following: circular, square, strip, and polygonal. The via 24 located at the edge of the dispersion plate may have a different shape than the via 24 located in the middle of the dispersion plate.

[0051] Various shapes of through holes 24 can also be used in combination to achieve complementary functions on the same dispersion plate. For example, the circular holes and square holes are distributed alternately, which can both protect fragile samples and ensure the dispersing effect of agglomerated samples. This avoids the problem that a single shape of through hole 24 cannot adapt to the characteristics of multiple samples at the same time, and improves the versatility of the device for different types of grain samples.

[0052] According to one embodiment of this application, such as Figure 9 As shown, the angle A1 between the plane where the first dispersion plate 22 is located and the end face of the sample container 1 is 40° to 50°, such as 45°; the angle A2 between the plane where the second dispersion plate 23 is located and the end face of the sample container 1 is 40° to 50°, such as 45°.

[0053] The angle between the plane of the first dispersion plate 22 and the bottom end face of the sample container 1 is 40° to 50°, and the angle between the plane of the second dispersion plate 23 and the bottom end face of the sample container 1 is also 40° to 50°. This angle range can achieve a balance between intercepting the sample and guiding the sample flow. If the angle is too large (close to 90°, i.e., the dispersion plate is almost perpendicular to the end face), the sample is likely to slide quickly along the surface of the dispersion plate when falling, and the interception effect of the dispersion plate on the sample is significantly weakened, making it difficult to fully contact and break up the agglomerates, resulting in poor dispersion effect. If the angle is too small (close to 0°, i.e., the dispersion plate is parallel to the end face), the blocking effect of the dispersion plate on the falling sample is too strong, which can easily cause the sample to accumulate on the surface of the dispersion plate, block the through hole 24 or hinder the subsequent sample from falling, affecting the overall material flow efficiency. The reasonable non-perpendicular angle setting can not only allow the sample to form effective contact with the dispersion plate, breaking the agglomerate state through the interception force of the plate on the sample, but also guide the sample to move obliquely downward along the plate surface, avoiding rapid sliding or excessive accumulation, thus ensuring smooth material flow and full dispersion.

[0054] Within this angle range, the first dispersing plate 22 and the second dispersing plate 23 can guide the sample to form a more complex motion trajectory. Since the two plates are staggered along the length of the fixed axis 21 and both form an angle of 40° to 50° with the end face, the sample diffuses in one axial direction after contacting the first dispersing plate 22 and in another axial direction after contacting the second dispersing plate 23. The two diffusion directions work together to expand the axial movement range of the sample within the container, reducing localized mixing unevenness caused by a single movement direction. Simultaneously, at this angle, the collision force between the sample and the dispersing plate is moderate, breaking up sample agglomerates without causing excessive particle breakage due to overly violent collisions, ensuring that the sample particle size meets the detection requirements, especially suitable for the physical characteristics of grain samples (such as crushed wheat and corn particles).

[0055] According to one embodiment of this application, such as Figure 9 As shown, the plane where the first dispersion plate 22 is located and the plane where the second dispersion plate 23 is located have an included angle A3, which is 80° to 100°, such as 90°.

[0056] The angle A3 between the plane containing the first dispersion plate 22 and the plane containing the second dispersion plate 23 is set to 80° to 100° (e.g., 90°). This angle range ensures that the two plates complement each other while avoiding mixing defects caused by an angle that is too small or too large. An angle of 80° to 100° allows the two plates to maintain sufficient directional guidance differences while avoiding dead angles caused by excessive gaps, thus providing a structural basis for sufficient contact and dispersion of the sample.

[0057] When the included angle is 90°, the first dispersion plate 22 and the second dispersion plate 23 are perpendicular to each other, and the two plates guide the sample in completely different directions. When the sample container 1 is flipped over and the sample falls, some of the sample moves along the first direction after contacting the first dispersion plate 22, while other samples move along the second direction perpendicular to the first direction after contacting the second dispersion plate 23. The two different directions of movement increase the probability of subsequent collisions of sample particles (e.g., between particles, or between particles and the inner wall of the sample container 1). The originally orderly falling motion is broken, forming a more complex three-dimensional motion trajectory, which effectively improves the problem of the single direction of sample movement caused by a single-angle dispersion plate.

[0058] According to one embodiment of this application, both the sample container 1 and the mixing component 2 are stainless steel components, such as food-grade 304 stainless steel. The fixing shaft 21 is fixed to the inner wall of the sample container 1 by welding.

[0059] Sample container 1 and mixing component 2 are made of stainless steel, which is fully adaptable to the usage requirements and environmental characteristics of grain sample testing. Stainless steel has excellent corrosion resistance, resisting the erosion of trace amounts of moisture, organic acids, and other substances that may be present in the grain sample. This prevents rust or structural damage to the components, extending the overall service life of the device. It also prevents rust products from contaminating the sample, ensuring the accuracy of subsequent test results and meeting the stringent requirements for sample cleanliness in food safety testing. Furthermore, the smooth surface of stainless steel is easy to clean. After each sample mixing, residual sample powder on the surface of the components can be quickly removed, avoiding cross-contamination between different batches of samples and reducing detection errors caused by contamination. This provides support for the repeatability and reliability of the testing work. At the same time, stainless steel has high structural strength. The fixed shaft 21, the first dispersion plate 22, and the second dispersion plate 23 in mixing component 2 are not easily deformed or broken when subjected to the force of sample impact or container overturning, maintaining a stable structural shape over a long period and ensuring consistent mixing results.

[0060] The fixed shaft 21 is welded to the inner wall of the sample container 1, forming a high-strength connection structure. Compared with detachable methods such as bolted connections, welding eliminates the gap between the fixed shaft 21 and the inner wall of the container, preventing sample powder from accumulating in the gap, reducing cleaning dead zones, and preventing the fixed shaft 21 from loosening or shifting when the container is tilted or the sample is impacted. The stability of the fixed shaft 21 directly affects the positional stability of the first dispersion plate 22 and the second dispersion plate 23. Welding ensures that the two plates always maintain a staggered layout along the length of the fixed shaft 21 and a non-perpendicular angle with the end face of the sample container 1, avoiding positional deviation of the two plates due to displacement of the fixed shaft 21, which would affect the dispersion and mixing effect of the sample and provide structural protection for the long-term stable operation of the device.

[0061] According to one embodiment of this application, such as Figure 1 As shown, sample container 1 is a cylinder; Figure 1 and Figure 6 As shown, the first dispersion plate 22 and the second dispersion plate 23 are semi-circular plates.

[0062] The sample container 1 is cylindrical, and the first dispersion plate 22 and the second dispersion plate 23 are semi-circular plates. This shape combination allows for height adaptation between the dispersion plates and the inner wall of the container, reducing mixing dead zones caused by structural gaps. The inner wall of the cylindrical container has an arc-shaped curved surface, and the arc-shaped edge of the semi-circular plate can adapt to the shape of the inner wall of the container, avoiding large right-angle gaps between traditional rectangular or square dispersion plates and the arc-shaped inner wall. The shape of the semi-circular plate makes the radial coverage range of the dispersion plate within the container more reasonable. A single semi-circular plate can cover half of the container's cross-section. Combined with the staggered layout of the first dispersion plate 22 and the second dispersion plate 23 along the length direction of the fixed axis 21, the two dispersion plates can form complementary coverage of the container's cross-section in the axial direction, ensuring that the sample can contact the dispersion plate regardless of its radial position within the container when falling, avoiding the situation of "local sample not being dispersed".

[0063] According to one embodiment of this application, such as Figure 2 As shown, a first channel 12 is provided between the edge of the first dispersion plate 22 and the inner wall of the sample container 1; a second channel 13 is provided between the edge of the second dispersion plate 23 and the inner wall of the sample container 1.

[0064] A first channel 12 is provided between the edge of the first dispersing plate 22 and the inner wall of the sample container 1, and a second channel 13 is provided between the edge of the second dispersing plate 23 and the inner wall of the sample container 1. This effectively avoids the problem of material flow obstruction caused by the dispersing plate being completely attached to the inner wall of the container. If the edge of the dispersing plate is not directly attached to the inner wall without a channel, when the sample container 1 is flipped, the sample near the inner wall is easily blocked by the edge of the dispersing plate. Especially when the sample volume is large or the flowability is poor, it is easy to accumulate at the edge, block the through hole 24 or hinder the subsequent sample from falling, affecting the mixing efficiency. The first channel 12 and the second channel 13 can serve as auxiliary flow paths for materials, allowing some of the sample near the inner wall to flow smoothly through the channels, balancing the material pressure on both sides of the dispersing plate, maintaining the continuity of the overall material flow, and ensuring that the mixing process proceeds stably.

[0065] Simultaneously, the first channel 12 and the second channel 13, together with the through-hole 24 of the dispersion plate, form a "dual-channel diversion" effect, enhancing the turbulence of sample movement. As the sample falls, some samples pass through the through-hole 24 on the dispersion plate, while others pass through the edge channels. This diversion of two different paths causes the sample to form multiple material flows with different directions within the container. Combined with the staggered arrangement of the first dispersion plate 22 and the second dispersion plate 23 along the length of the fixed axis 21, and the included angle between the two plates, samples passing through the first channel 12, the second channel 13, and the through-hole 24 will converge and collide in different areas, further disrupting the orderly movement of the samples. This avoids the problem of insufficient mixing uniformity caused by a single flow path, and especially improves the mixing dead zones caused by restricted flow near the inner wall of the container, ensuring that samples throughout the entire radial range within the container can be fully mixed.

[0066] Furthermore, the design of the first channel 12 and the second channel 13 can reduce the precision requirements for the processing and assembly of the dispersing plate. If the edge of the dispersing plate needs to be completely fitted to the inner wall of the container, the dimensional accuracy of the dispersing plate and the roundness of the inner wall of the container must be strictly controlled, resulting in high processing costs. The existence of the channels allows for a certain assembly gap between the edge of the dispersing plate and the inner wall, eliminating the need to excessively pursue high precision, reducing manufacturing difficulty and costs, while still ensuring material flow and mixing effect through the channel function, thus balancing economy and practicality.

[0067] The mixing device for grain samples provided in this application embodiment can perform multi-sample testing. The device can be flexibly placed according to the laboratory space, is easy to operate, and is suitable for testing multiple batches of grain samples. It is simple to operate and effectively solves the grading and clumping phenomenon that occurs in powder samples, especially those with high oil content such as corn, during the tumbling and mixing process. It promotes the random distribution of powder samples and can improve the sample mixing efficiency by more than 2 times while ensuring sample uniformity.

[0068] In practical use, a certain mass of grain powder sample is first added, and after sealing, the sample is turned over for a certain period of time under the action of external power to achieve rapid mixing of the sample in the container. The size of each component in the mixing device can be adjusted according to the actual amount of sample to be mixed.

[0069] Tests showed that when the sample mass was 1 kg and the mixture was stirred at 40 r / min for 20 min, the standard deviation of repeatability of the sample detection results using the above-mentioned mixing device was reduced by 2.5% to 5.7% compared with the original device. The test results indicate that the standard deviation of repeatability of mycotoxin determination values ​​of grain samples mixed with the device of this invention meets the repeatability requirements specified in the detection method LS / T6112-2015.

[0070] According to a second aspect of this application, a mixing system for a grain sample is provided. The mixing system includes a driving mechanism and the aforementioned mixing device for the grain sample. The driving mechanism is used to drive the mixing device for the grain sample to rotate up and down.

[0071] The driving mechanism drives the mixing device for grain samples to rotate up and down, enabling a continuous and regular reciprocating downward motion of the sample within the closed cavity 11 of the mixing device. This provides the power basis for the first dispersing plate 22 and the second dispersing plate 23 to fully exert their dispersing effect. The up-and-down rotation allows the sample to fall continuously from the upper part of the cavity to the lower part under the action of gravity, and then rise back from the lower part to the upper part as the container rotates in the opposite direction, forming a cyclical falling trajectory. This allows the sample to pass through the first dispersing plate 22 and the second dispersing plate 23 multiple times, repeatedly being intercepted, dispersed, and guided, greatly improving the thoroughness of dispersion and mixing, and avoiding the problem of uneven mixing in certain areas caused by single contact.

[0072] Meanwhile, the up-and-down tumbling motion can form a highly efficient synergy with the internal structure of the mixing device. The staggered arrangement of the first dispersing plate 22 and the second dispersing plate 23 along the length of the fixed axis 21, the included angle between the two plates, the through holes 24 on the plates, and the first channel 12 and the second channel 13 on the edge can fully function under the action of up-and-down tumbling: when the sample falls, the shearing effect of the through holes 24 on the sample, the guiding effect of the included angle between the two plates on the direction of sample movement, and the auxiliary effect of the channels on the flow of materials can all take effect multiple times in repeated tumbling, so that the sample continuously generates turbulent motion in the radial, axial, and circumferential dimensions, breaking the limitation that the sample easily forms a fixed flow path in the traditional single tumbling, and further enhancing the mixing uniformity.

[0073] The stable flipping power provided by the drive mechanism ensures that the amplitude and frequency of each flip are consistent, avoiding the differences in mixing conditions caused by uneven force during manual flipping. This ensures that the mixing process of different batches of grain samples is consistent, providing a guarantee for the repeatability and accuracy of subsequent test results and solving the problem of fluctuations in mixing effect caused by manual operation or unstable drive.

[0074] The combination of the drive mechanism and the mixing device can also improve mixing efficiency. Compared with the existing empty barrel-shaped containers that require a long time to be turned over to achieve a mixing effect, the multiple dispersion action of the dispersion plate in this system, combined with the cyclical motion of turning up and down, can make the sample reach a uniform state in a shorter time, reduce the time spent on sample preparation in grain quality testing, alleviate the problem of low testing efficiency, and is especially suitable for food safety indicator testing scenarios such as mycotoxins that require rapid results.

[0075] Of course, in addition to the above-mentioned scheme of achieving automated mixing through a driving mechanism, the mixing device provided in this application embodiment can also achieve mixing by manually driving the sample container 1 to flip up and down.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A mixing device for grain samples, characterized in that, include: Sample container (1), with a closed cavity (11) for containing the sample; A mixing component (2) is disposed in the closed cavity (11) and includes a fixed shaft (21), a first dispersion plate (22), and a second dispersion plate (23). The two ends of the fixed shaft (21) are fixed to the inner sidewall of the sample container (1). The first dispersion plate (22) and the second dispersion plate (23) are fixedly installed on the fixed shaft (21) and are staggered along the length direction of the fixed shaft (21). The first dispersion plate (22) and the second dispersion plate (23) are provided with through holes (24) for the sample to pass through. The plane where the first dispersion plate (22) is located and the plane where the second dispersion plate (23) is located are not perpendicular to the end face of the sample container (1) so that at least part of the sample passes through the first dispersion plate (22) and the second dispersion plate (23) when the sample container (1) is flipped over and the sample falls.

2. The mixing device for grain samples according to claim 1, characterized in that, A first mounting plane (211) is provided on the outer peripheral surface of the fixed shaft (21), a first connecting hole (212) is provided on the first mounting plane (211), a first mating hole (221) is provided on the first dispersing plate (22), and a fastener is inserted into the first connecting hole (212) and the first mating hole (221) to fix the first dispersing plate (22) on the fixed shaft (21); A second mounting plane (213) is provided on the outer peripheral surface of the fixed shaft (21), a second connecting hole (214) is provided on the second mounting plane (213), and a second mating hole (231) is provided on the second dispersing plate (23). Fasteners are inserted into the second connecting hole (214) and the second mating hole (231) to fix the second dispersing plate (23) on the fixed shaft (21). The first mounting plane (211) and the second mounting plane (213) are offset from each other in the length direction of the fixed shaft (21).

3. The mixing device for grain samples according to claim 1, characterized in that, On the first dispersion plate (22) and the second dispersion plate (23), the pore density in the region near the middle position of the fixed shaft (21) is lower than the pore density in the region near the inner wall of the sample container (1).

4. The mixing device for grain samples according to claim 1, characterized in that, The via (24) is one or more of the following: circular hole, square hole, strip hole, and polygonal hole.

5. The mixing device for grain samples according to claim 1, characterized in that, The angle between the plane containing the first dispersion plate (22) and the end face of the sample container (1) is 40° to 50°. The angle between the plane of the second dispersion plate (23) and the end face of the sample container (1) is 40° to 50°.

6. The mixing device for grain samples according to claim 1, characterized in that, The plane containing the first dispersion plate (22) and the plane containing the second dispersion plate (23) have an angle of 80° to 100°.

7. The mixing device for grain samples according to claim 1, characterized in that, Both the sample container (1) and the mixing assembly (2) are stainless steel components, and / or the fixing shaft (21) is fixed to the inner wall of the sample container (1) by welding.

8. The mixing apparatus for grain samples according to any one of claims 1 to 7, characterized in that, The sample container (1) is a cylinder, and the first dispersion plate (22) and the second dispersion plate (23) are semi-circular plates.

9. The mixing device for grain samples according to claim 8, characterized in that, A first channel (12) is provided between the edge of the first dispersion plate (22) and the inner wall of the sample container (1). A second channel (13) is provided between the edge of the second dispersion plate (23) and the inner wall of the sample container (1).

10. A mixing system for grain samples, characterized in that, It includes a driving mechanism and a mixing device for a grain sample as described in any one of claims 1 to 9, wherein the driving mechanism is used to drive the mixing device for the grain sample to rotate up and down.

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