Gravitational driving based grain mixing device and sample dividing system

Abstract

The application relates to a gravity-driven grain mixing device and a sample distribution system, which comprises a discharging component with a flow guide channel extending from top to bottom, the flow guide channel penetrating the upper and lower ends of the discharging component and being configured to receive materials and make the materials move downwards along the flow guide channel under the action of gravity; a plurality of material distribution pieces are arranged in the flow guide channel, and the material distribution pieces in each row are formed with a flow distribution gap; the utility model constructs an efficient mixing structure driven by gravity by using the plurality of material distribution pieces which are staggered in a triangular shape, the materials are repeatedly segmented, guided and mixed by the material distribution pieces during the falling process along the flow guide channel, so that sufficient mixing is realized without external power, the uniformity of the samples is ensured, the sample distribution structure is obviously simplified, the manufacturing cost and the use threshold are reduced, and a foundation preparation is made for subsequent further sample distribution.

Description

Technical Field

[0001] This application relates to the field of sample separation equipment technology, and in particular to a gravity-driven grain mixing device and sample separation system. Background Technology

[0002] Obtaining representative samples is a crucial step in grain quality inspection, breeding screening, and storage management. Currently, common mixing and sampling operations present the following problems: First, laboratory sampling mainly faces a dilemma between traditional tools and electric equipment. On the one hand, traditional manual samplers (such as conical samplers) have a simple structure, but their sampling function is limited and accuracy is limited, often requiring repeated operations to obtain a satisfactory sample, a cumbersome process prone to human error. To improve sampling efficiency and accuracy, existing technologies also use electric samplers (such as centrifugal samplers), but these suffer from complex structures, high equipment costs, difficulty in cleaning and maintenance, and large space requirements, making their high cost and complexity unsuitable for widespread adoption in small and medium-sized laboratories. Second, in the on-site sampling stage, regulations require that grains be sampled as soon as possible after leaving the warehouse to minimize the impact of the external environment. However, current sampling equipment is insufficient to meet the needs of this on-site operation, requiring manual sampling, which is inefficient and inconsistent. Furthermore, most existing sampling equipment is bulky, difficult to move, and has a fixed sampling ratio, making it unable to flexibly adapt to different sampling requirements. More importantly, grain silos often lack a stable power supply, causing many electric sampling devices that rely on external power to malfunction, further inconveniencing the sampling work on-site. Utility Model Content

[0003] To address the technical problems mentioned in the background art, such as insufficient accuracy of traditional manual samplers, high cost and inconvenience of electric equipment, and inability to quickly achieve mixing and sampling at the grain warehouse site, resulting in insufficient sample representativeness, this application provides a gravity-driven grain mixing device and sampling system.

[0004] The technical solution of the gravity-driven grain mixing device and sample distribution system provided in this application is as follows: A gravity-driven grain mixing device includes: The feeding component has a guide channel extending from top to bottom, the guide channel passing through the upper and lower ends of the feeding component, and is configured to receive the material and allow the material to move downward along the guide channel under its own gravity; Multiple material distribution components are disposed within the flow guiding channel. Each row of multiple material distribution components forms a flow dividing gap with each other. The material distribution components are arranged in multiple staggered rows within the flow guiding channel to divide and mix the material flow. During the sample separation process, the material moves from top to bottom along the guide channel under its own gravity. During the movement, it is divided into multiple sub-streams by the material separating component and moves downward along the separation gap, thus achieving the initial mixing of the material.

[0005] The above technical solution utilizes multiple rows of staggered, triangularly distributed material distribution components to construct a highly efficient gravity-driven mixing structure. As the material falls along the guide channel, it is repeatedly divided, guided, and cross-mixed by the material distribution components, thereby achieving thorough mixing without external power. This not only ensures the uniformity of the sample but also significantly simplifies the sample distribution structure, reduces manufacturing costs and the barrier to entry, and lays a solid foundation for further sample distribution.

[0006] Optionally, the feeding component is a U-shaped trough structure, and the feeding component is arranged at an angle from top to bottom.

[0007] Optionally, the feeding component has a box-type structure, and the feeding component is arranged inclined or vertically from top to bottom.

[0008] Through the above technical solutions, while ensuring the normal flow of materials, the feeding components can be designed in different shapes according to different actual needs, thereby expanding their applicability.

[0009] Optionally, the material distribution components are arranged in an array on the feeding component, with the upper and lower adjacent rows of material distribution components arranged in a triangular cross pattern.

[0010] By adopting the above technical solution, the material can be distributed more evenly using the material distribution component, resulting in better material distribution effect.

[0011] Optionally, the shape of the sub-component can be an inverted V-shape, triangle, circle, ellipse, or arc.

[0012] The above technical solution provides a rich design space for the shape design of the material distribution component. The most suitable shape of the material distribution component can be selected according to the flow characteristics of different materials to obtain the best mixing effect.

[0013] A gravity-driven grain sampling system, applied to the aforementioned grain mixing device, further includes one or more sampling units disposed below the feeding component. Each sampling unit includes a sampler for receiving the mixed material discharged from the feeding component and dividing it into at least two streams.

[0014] Optionally, the sampler includes a receiving bin at the top, with multiple vertical partitions arranged horizontally at intervals below the receiving bin. A grid is formed between two adjacent partitions, and an inclined diversion plate is provided in the grid. The lower ends of the diversion plates in two adjacent grids extend inclinedly to the left and right sides of the sampler, respectively, so that the lower end of the sampler forms a dispensing port with different discharge directions, thereby uniformly dividing the material entering the sampler into at least two streams, which are then discharged from the corresponding dispensing ports.

[0015] Through the above technical solution, after the material is initially mixed by the feeding component and the separating component, the material is further divided into even samples by the sampling unit, and the sampled material is then exported to complete the sampling.

[0016] Optionally, the sampling unit is provided with multiple layers, and the outlets and inlets of the upper and lower sampling units are connected accordingly. By configuring the number of layers of the sampling unit, the number of samplers in each layer, and / or the number of streams in a single sampler, different numbers or proportions of samples can be obtained.

[0017] The above technical solution can obtain samples of different quantities and proportions according to different needs, which can expand the flexibility of sample division. By selecting and setting different number of sample division units, selecting and setting one or more sample dividers in each layer, and configuring the number of diversions of each sample divider (such as two-way, three-way, four-way, etc.), and collecting the material from specific outlets accordingly, it is possible to flexibly obtain and accurately divide samples of different proportions and quantities.

[0018] Optionally, the samplers in the sample division unit are all divisors, and the system is configured to divide the material flow into 2 to the power of N parts, where N is an integer greater than or equal to 1.

[0019] By employing the above technical solution and a progressively increasing sample divider arrangement, materials can be systematically divided into 2 to the power of N parts. Depending on actual needs, materials can be divided into 4, 8, or 16 parts, thus enhancing the applicability of the product.

[0020] Optionally, the sampling unit has two layers. The lower layer has a third receiving component arranged below the two samplers. The third receiving component has four independent sampling channels, which are respectively arranged below the four feeding ports of the two samplers.

[0021] The above technical solution utilizes four independent sampling channels to independently divide a sample into four equal parts, achieving the desired sample collection effect.

[0022] Optionally, a feeding hopper is provided below the third receiving component. The inner cavity of the feeding hopper is connected to four sample dispensing channels in the third receiving component. An isolation plate is movably connected inside the feeding hopper. The lower end of the isolation plate is hinged to the feeding hopper. A telescopic plate is slidably connected to the isolation plate. The upper end of the telescopic plate is slidably connected to the upper position of the feeding hopper. The isolation plate and the telescopic plate are configured to divide the internal cavity of the feeding hopper into two independent cavities. The lower end of the feeding hopper is provided with a feeding port that communicates with the two cavities respectively.

[0023] The above technical solution allows the telescopic plate to be moved between two designated sampling channels according to actual needs, obtaining 1 / 4, 1 / 2, or 3 / 4 of the original material as the final sample, thus improving the flexibility of sampling.

[0024] Optionally, the device also includes a frame, the feeding component is fixed inside the frame, a hopper is installed above the frame, the inner cavity of the hopper is connected to the flow channel of the feeding component, and a gate is installed between the hopper and the feeding component, the gate being configured to isolate the inner cavity of the hopper from the flow channel.

[0025] The above technical solution allows raw materials to enter the guide channel of the feeding component along the hopper, realizing the guiding function. Furthermore, the gate can be used to control the start and stop of material flow and the flow rate, improving the convenience of operation.

[0026] Optionally, retractable support legs are installed at the four corners of the frame. When the support legs are shortened, they are hidden inside the frame.

[0027] The above technical solution provides stable support when the support leg is extended, and can be completely hidden inside the frame when retracted, which reduces the volume of the entire sample distribution system and avoids possible damage from bumps during transportation.

[0028] Optionally, the frame is provided with a shoulder strap on the side.

[0029] By adopting the above technical solution, staff can easily carry the device to various sampling points, achieving the effect of easy transfer.

[0030] In summary, this application includes at least one of the following beneficial technical effects: This invention utilizes multiple rows of material distribution components arranged in a staggered, triangular pattern to construct a highly efficient gravity-driven mixing structure. As the material falls along the guide channel, it is repeatedly divided, guided, and cross-mixed by the material distribution components, thereby achieving thorough mixing without external power. This not only ensures the uniformity of the sample but also significantly simplifies the sample distribution structure, reduces manufacturing costs and the barrier to entry, and lays a solid foundation for further sample distribution.

[0031] This utility model's sampling system employs a modular design for its multi-layered sampling units. By selecting and setting different numbers of sampling units, configuring one or more samplers in each layer, and setting the number of streams for each sampler (e.g., two-way, three-way, four-way, etc.), and correspondingly collecting material from specific outlets, flexible acquisition and precise sampling of samples with different proportions and quantities can be achieved. For example, users can configure the system to achieve traditional 2 to the power of N equal divisions (e.g., 4 equal parts, 8 equal parts), asymmetric reduction (e.g., obtaining 1 / 4, 1 / 8 of the original material), or obtaining a specific number of equal parts (e.g., obtaining 4 samples, each accounting for 1 / 8), or even achieving complex arbitrary target proportions (e.g., 1 / 3, 1 / 5) or target quantities (e.g., 3 equal parts, 6 equal parts). Among these, using all binary samplers in multi-layer cascades to achieve 2 to the power of N sampling is a highly efficient and preferred configuration for standard grain sampling applications. This high degree of configurability greatly enhances the practicality and applicability of the equipment. Attached Figure Description

[0032] Figure 1 This is a perspective view of Embodiment 1 of this utility model; Figure 2 This is an exploded view of Embodiment 1 of this utility model; Figure 3 This is a perspective view of the internal structure of Embodiment 1 of this utility model; Figure 4 This is a cross-sectional view of the internal structure of Embodiment 1 of this utility model; Figure 5 This is a perspective view of the feeding component and the separating component according to an embodiment of the present utility model; Figure 6 This is a partial plan view of the feeding component and the separating component according to an embodiment of the present invention; Figure 7 This is a partial perspective sectional view of the sample divider according to Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of the upper and lower two-layer sample separation unit of Embodiment 1 of this utility model; Figure 9 This is a perspective view of Embodiment 2 of this utility model; Figure 10 This is a perspective view of the internal structure of Embodiment 3 of this utility model; Figure 11 This is an exploded view of the internal structure of Embodiment 3 of this utility model; Figure 12 This is a cross-sectional view of the internal structure of Embodiment 3 of this utility model; Figure 13 This is a partial structural diagram of Embodiment 4 of this utility model.

[0033] Explanation of reference numerals in the attached figures: 1. Hopper; 2. Frame; 3. Gate; 4. Feeding component; 401. Guide channel; 5. Divider; 6. Divider gap; 7. Sample dispenser; 701. Receiving bin; 702. Partition; 703. Grid; 704. Divider plate; 705. Feeding port; 8. Guide plate; 9. First feeding plate; 10. Second feeding plate; 11. Support leg; 12. Shoulder strap; 13. Third receiving component; 1301. Sample distribution channel; 14. Telescopic plate; 1401. Lever; 15. Isolation plate; 16. Feeding bin; 1601. Slide. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1-8 As shown, this embodiment discloses a gravity-driven grain mixing device, including a frame 2 and a feeding component 4, which is disposed inside the frame 2.

[0037] The feeding component 4 has a guide channel 401 extending from top to bottom. The guide channel 401 passes through the upper and lower ends of the feeding component 4 and is configured to receive the material and allow the material to move downward along the guide channel 401 under its own gravity. In this example, the feeding component 4 is a trough structure with a U-shaped cross section, and the feeding component 4 is arranged at an angle from top to bottom, that is, the material can move downward at an angle along the guide channel 401.

[0038] It is understood that in other embodiments, the feeding component 4 can also be designed as a box-type structure. The inner cavity of the box-type structure is the flow channel 401. That is, the feeding component 4 is a rectangular cylindrical structure with open top and bottom ends. Since the box-type structure is surrounded on all four sides, the feeding component 4 can be designed as a structure that is inclined from top to bottom or arranged vertically, which will not cause the problem of material splashing outward.

[0039] In this example, there is one feeding component 4. It is understood that in other embodiments (such as embodiment four), the number of feeding components 4 can be two (e.g., Figure 13 (as shown in the image) or two or more, to achieve a more uniform mixing effect.

[0040] It also includes multiple material distribution components 5, which are disposed within the flow guiding channel 401. Each row of multiple material distribution components 5 forms a flow dividing gap 6 between each other. The material distribution components 5 are arranged in multiple staggered rows within the flow guiding channel 401 to divide and mix the material flow. The material distribution components 5 are arranged in an array on the feeding component 4, with adjacent rows of material distribution components 5 arranged in a triangular pattern. During the sample distribution process, the material moves from top to bottom along the flow guiding channel 401 under its own gravity, and is divided into multiple sub-flows by the material distribution components 5 during the movement and moves downward along the flow dividing gap 6, thereby achieving preliminary mixing of the material.

[0041] In this example, the material distribution component 5 has an inverted V-shaped structure. It is understood that in other embodiments, the material distribution component 5 can also be designed as a triangle, circle, ellipse or arc structure. When it is an arc structure, its arc surface faces upward.

[0042] A hopper 1 is installed above the frame 2. The inner cavity of the hopper 1 is connected to the flow channel 401 of the feeding component 4. A gate 3 is installed between the hopper 1 and the feeding component 4. The gate 3 is configured to isolate the inner cavity of the hopper 1 from the flow channel 401.

[0043] A gravity-driven grain sampling system includes the aforementioned grain mixing device and one or more sampling units disposed below the feeding component 4. Each sampling unit includes a sampler 7, which receives the mixed material discharged from the feeding component 4 and divides it into at least two streams. In this example, the material discharged from the sampler 7 is in two streams, but it can also be divided into multiple streams according to actual needs. The sampler 7 itself can be a basic module such as a bi-splitter, a tri-splitter, or a quad-splitter. The sampler 7 includes a receiving bin 701 located at the top. The receiving bin 701 has a four-sided encircling annular structure and serves as a transition piece, allowing the material to fall downwards from the receiving bin 701 and preventing splashing. Below the receiving bin 701, multiple vertical partitions 702 are arranged at horizontal intervals. A grid 703 is formed between two adjacent partitions 702. An inclined diversion plate 704 is provided in the grid 703. The lower ends of the diversion plates 704 in two adjacent grids 703 extend inclinedly to the left and right sides of the sampler 7, so that the lower end of the sampler 7 forms a dispensing port 705 with different discharge directions. The dispensing ports 705 on the same side can be grouped together, or several dispensing ports 705 on the same side can be grouped together and collected in a concentrated manner, so that the material entering the sampler 7 is evenly divided into at least two streams and discharged from the corresponding dispensing port 705.

[0044] In one embodiment, the sampling unit is set up with only one layer (not shown in the figure), and there is one sampler 7. The material discharged from the feeding part 4 is directly divided into two parts by the sampler 7 and collected.

[0045] In this example, the sampling unit has two layers, and each layer of the sampling unit has one sampler 7. The upper sampler 7 has a first receiving component below all the dispensing ports 705 on one side, and the lower sampler 7 is located below all the dispensing ports 705 on the other side. The partition 702 of the lower sampler 7 is located in the middle position below the dispensing ports 705 of the upper sampler 7. This allows the sampler 7 to continue to mix and distribute the material, further achieving a uniform mixing effect. Among the dispensing ports 705 on both sides of the lower sampler 7, one dispensing port 705 is connected to the first receiving component, and the other dispensing port 705 is located below the second receiving component.

[0046] In this example, the first receiving assembly includes a first discharge plate 9 and a guide plate 8 fixed within the frame 2. The guide plate 8 is located above the first discharge plate 9 and is used to collect the material discharged from the upper sampler 7. The guide plate 8 prevents splashing when the material falls. Both the first discharge plate 9 and the guide plate 8 are U-shaped trough structures used to collect half of the material discharged from the upper sampler 7 and a quarter of the material discharged from the lower sampler 7. The second receiving plate, also known as the second discharge plate 10, is fixed to the frame 2 and is responsible for collecting the quarter of the material discharged from the lower sampler 7 for use as a sample.

[0047] In this example, retractable support legs 11 are installed at the four corners of the frame 2. When the support legs 11 are shortened, they are hidden inside the frame 2. The structure and principle of this retractable support leg 11 are conventional designs in the prior art and will not be elaborated on here.

[0048] A method for mixing particulate materials, applied to the above-mentioned grain sampling system, wherein the particulate materials pass through a guide channel 401 under the action of gravity; at least two rows of staggered distribution components 5 are provided in the guide channel 401; when the material flows through the distribution components 5, it is repeatedly divided, guided and cross-mixed between different channels to achieve homogenization.

[0049] To further mix the material, the mixed material is introduced into the sampler 7, and the material is evenly divided into at least two streams by the alternating inclined diverter plate 704.

[0050] In practice, the material flowing out of the sampler 7 and after being divided can be sampled again using the above method or collected directly.

[0051] Example 2

[0052] like Figure 9As shown, the only difference between this embodiment and the above embodiment is that: in this example, the side of the frame 2 is provided with a shoulder strap 12, which can be used to easily transfer the sample distribution system by carrying it on the shoulder during the transfer process, thereby completely freeing up the hands and improving the convenience of moving the sample distribution system.

[0053] Example 3

[0054] like Figure 10-12 As shown, the difference between this embodiment and the first embodiment above is only that: the sampling unit is provided with N layers, where N is greater than or equal to 2, the uppermost sampling unit has one sampler 7, and in two adjacent sampling units, two samplers 7 are respectively arranged below the single sampler 7 of the upper sampling unit, and the partition 702 of the lower sampler 7 is located in the middle position below the material dispensing port 705 of the upper sampler 7, configured to divide the material into equal parts of 2 to the power of N.

[0055] More specifically, in this example, the sampling unit is set up in two layers. The upper sampling unit has one sampler 7, and the lower sampling unit has two samplers 7. The two feeding ports 705 on the left and right sides below the upper sampler 7 correspond to the receiving bins 701 above the lower sampler 7. This is used to continue the sampling after the material is divided into two by the upper sampler 7, so that four samples can be obtained in the end.

[0056] In this example, a third receiving component 13 is arranged below the two lower samplers 7. The third receiving component 13 is a box-type structure that runs vertically through the upper and lower parts. The third receiving component 13 has four independent sample dispensing channels 1301 inside. The four independent sample dispensing channels 1301 are arranged side by side and are respectively arranged below the four dispensing ports 705 of the two upper samplers 7.

[0057] In this example, a feeding hopper 16 is provided below the third receiving component 13. The inner cavity of the feeding hopper 16 is connected to the four sample dispensing channels 1301 in the third receiving component 13. An isolation plate 15 is movably connected inside the feeding hopper 16. The lower end of the isolation plate 15 is hinged to the feeding hopper 16. A telescopic plate 14 is slidably connected to the isolation plate 15. The upper end of the telescopic plate 14 is slidably connected above the feeding hopper 16. Specifically, the lower end of the isolation plate 15 is rotatably installed inside the feeding hopper 16 via a pin, allowing the isolation plate 15 to swing within the feeding hopper 16. The telescopic plate 14 is used to compensate for the overall length of the isolation plate 15 during its swing. To facilitate the swinging of the isolation plate 15 and the telescopic plate 14, outwardly extending levers 1401 are provided on both sides of the upper end of the telescopic plate 14. A horizontally arranged groove 1601 is provided on the side wall of the feeding bin 16, and the levers 1401 are slidably disposed in the groove 1601. The isolation plate 15 and the telescopic plate 14 are configured to divide the internal cavity of the feeding bin 16 into two independent cavities. The lower end of the feeding bin 16 is provided with a feeding port that communicates with each of the two cavities. This configuration is mainly used to move the telescopic plate 14 between two designated sampling channels 1301 according to actual needs, and obtain 1 / 4, 1 / 2, or 3 / 4 of the original material as the final sample, thereby improving the flexibility of sampling.

[0058] It should be noted that the number of sampling units and the number of samplers per layer in the above embodiments are merely examples. Those skilled in the art will understand that the core of the sampling system lies in its modular and configurable diversion logic.

[0059] In practical applications, the sampling units can be flexibly configured according to the target sample ratio or number of portions. For example: Configuration A (Obtaining 1 / 4 Reduced Sample): Activate the first-layer sampling unit and direct one of its two outlets to waste, collecting only the material from the other outlet to obtain a 1 / 2 sample. For a 1 / 4 sample, connect a separate second-layer sampler (instead of two) and similarly collect only the material from one of its outlets. Configuration B (Obtaining 4 1 / 8 Reduced Samples): Activate the first-layer sampling unit (one sampler) to divide the material into two streams. Then, set up one sampler (instead of two) in the second layer to receive one of the streams and divide it into two streams again (resulting in two 1 / 4 portions). Finally, set up two samplers in the third layer to receive the two streams from the second layer, dividing each in half, ultimately obtaining four 1 / 8 portions from the four outlets.

[0060] As demonstrated by the above examples, by adjusting the number of layers in the sampling unit, the number of samplers activated in each layer, the number of samples divided by a single sampler, and the collection strategy for the outlet material, this system can achieve various sampling modes, ranging from simple bisection to complex proportional reduction and equal division. All such configurations and variations based on the core diversion principle of this utility model should be included within the protection scope of this utility model.

[0061] The above description is merely a preferred embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, such as applying them to other granular materials with similar properties (e.g., feed, ores, granular chemical products, etc.), or directly or indirectly applying them to other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A gravity-driven grain mixing device, characterized in that, include: The feeding component (4) has a guide channel (401) extending from top to bottom. The guide channel (401) runs through the upper and lower ends of the feeding component (4) and is configured to receive the material and allow the material to move downward along the guide channel (401) under its own gravity. Multiple material distribution components (5) are arranged in the flow channel (401). Each row of multiple material distribution components (5) forms a flow separation gap (6) between each other. The material distribution components (5) are arranged in multiple staggered rows in the flow channel (401) to divide and mix the material flow. During the sample separation process, the material moves from top to bottom along the guide channel (401) under its own gravity, and is divided into multiple sub-streams by the material distribution component (5) during the movement and moves downward along the separation gap (6) to achieve the initial mixing of the material.

2. The gravity-driven grain mixing device according to claim 1, characterized in that, The feeding component (4) is a U-shaped trough structure, and the feeding component (4) is arranged at an angle from top to bottom.

3. The gravity-driven grain mixing device according to claim 1, characterized in that, The feeding component (4) is a box-type structure, and the feeding component (4) is arranged inclined or vertically from top to bottom.

4. The gravity-driven grain mixing device according to claim 1, characterized in that, The material distribution components (5) are arranged in an array on the material feeding component (4), and the material distribution components (5) of two adjacent rows are arranged in a triangular cross shape.

5. A gravity-driven grain mixing device according to claim 1, characterized in that, The shape of the sub-component (5) is an inverted V-shape, triangle, circle, ellipse or arc.

6. A gravity-driven grain sampling system, characterized in that, include: The grain mixing device as described in any of claims 1-5 above, and one or more sampling units disposed below the feeding component (4), each sampling unit including a sampler (7) for receiving the mixed material discharged from the feeding component (4) and dividing it into at least two streams.

7. A gravity-driven grain sampling system according to claim 6, characterized in that, The sampler (7) includes a receiving bin (701) located at the top. Below the receiving bin (701), there are multiple vertical partitions (702) arranged at intervals along the horizontal direction. A grid (703) is formed between two adjacent partitions (702). An inclined diversion plate (704) is provided in the grid (703). The lower ends of the diversion plates (704) in two adjacent grids (703) extend inclinedly to the left and right sides of the sampler (7), so that the lower end of the sampler (7) forms a dispensing port (705) with different discharge directions. This uniformly divides the material entering the sampler (7) into at least two streams, which are then discharged from the corresponding dispensing ports (705).

8. A gravity-driven grain sampling system according to claim 6, characterized in that, The sampling unit is provided with multiple layers, and the outlets and inlets of the upper and lower sampling units are connected accordingly. By configuring the number of layers of the sampling unit, the number of samplers (7) in each layer and / or the number of diversions of a single sampler (7), different numbers or proportions of samples can be obtained.

9. A gravity-driven grain sampling system according to claim 8, characterized in that, The samplers (7) in the sample division unit are all divisors, and the system is configured to divide the material flow into 2 to the power of N parts, where N is an integer greater than or equal to 1.

10. A gravity-driven grain sampling system according to claim 9, characterized in that, The sampling unit has two layers. The lower layer has a third receiving component (13) arranged below the two samplers (7). The third receiving component (13) has four independent sampling channels (1301) inside. The four independent sampling channels (1301) are respectively arranged below the four feeding ports (705) of the two samplers (7).

11. A gravity-driven grain sampling system according to claim 10, characterized in that, Below the third receiving component (13) is a feeding hopper (16). The inner cavity of the feeding hopper (16) is connected to the four sample distribution channels (1301) in the third receiving component (13). An isolation plate (15) is movably connected inside the feeding hopper (16). The lower end of the isolation plate (15) is hinged to the feeding hopper (16). A telescopic plate (14) is slidably connected to the isolation plate (15). The upper end of the telescopic plate (14) is slidably connected to the upper position of the feeding hopper (16). The isolation plate (15) and the telescopic plate (14) are configured to divide the internal cavity of the feeding hopper (16) into two independent cavities. The lower end of the feeding hopper (16) is provided with a feeding port that is connected to the two cavities respectively.

12. A gravity-driven grain sampling system according to claim 6, characterized in that, It also includes a frame (2), the feeding component (4) is fixed inside the frame (2), a hopper (1) is installed above the frame (2), the inner cavity of the hopper (1) is connected to the guide channel (401) of the feeding component (4), and a gate (3) is installed between the hopper (1) and the feeding component (4), the gate (3) is configured to isolate the inner cavity of the hopper (1) from the guide channel (401).

13. A gravity-driven grain sampling system according to claim 12, characterized in that, The frame (2) is equipped with retractable support legs (11) at the four corners. When the support legs (11) are shortened, they are hidden inside the frame (2).

14. A gravity-driven grain sampling system according to claim 12, characterized in that, The frame (2) is provided with a shoulder strap (12) on the side.

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