Multi-stage impurity removal device for preliminary screening of schisandra chinensis

Abstract

The multistage impurity removal device comprises a shell, a screen mesh unit and a blowing impurity removal unit, the screen mesh unit and the blowing impurity removal unit are arranged on the shell, the screen mesh unit comprises a primary screen mesh, a secondary screen mesh and a tertiary screen mesh, and the primary screen mesh, the secondary screen mesh and the tertiary screen mesh are arranged in a zigzag shape from top to bottom, and the mesh number of the primary screen mesh, the secondary screen mesh and the tertiary screen mesh is gradually increased. Discharging ports are formed in the low ends of the primary screen, the secondary screen and the third screen, impurity removal ports are formed in the discharging ports, and air ports of the air blowing impurity removal unit correspond to the impurity removal ports in the discharging ports. According to the Chinese magnoliavine fruit screening device, multi-stage preliminary screening of Chinese magnoliavine fruits can be achieved, then Chinese magnoliavine fruits of different models can be obtained, multi-stage dust and impurity removal can be carried out through the blowing impurity removal unit, meanwhile, dust and impurity removal of each stage corresponds to discharging of each stage, and a better dust and impurity removal effect can be obtained. In addition, in the technical scheme provided by the utility model, the effective vibration of each screen can be realized only by adopting fewer vibration motors.

Description

Technical Field

[0001] This utility model relates to the technical field of screening and removing impurities from traditional Chinese medicine, and in particular to a multi-stage impurity removal device for the initial screening of Schisandra chinensis. Background Technology

[0002] Schisandra chinensis is the dried, mature fruit of the Schisandra chinensis plant (family Magnoliaceae). It is a traditional Chinese medicine with astringent, qi-tonifying, fluid-generating, kidney-tonifying, and heart-calming effects, and is widely distributed in the Heilongjiang, Jilin, and Liaoning regions. The medicinal properties of Schisandra chinensis are as follows: it is irregularly spherical or oblate in shape, with a diameter of 5-8 mm; the surface is wrinkled and prominent, appearing oily and easily contaminated with foreign matter; the pulp is soft, containing 1-2 kidney-shaped seeds. The removal and selection of impurities from Schisandra chinensis requires comprehensive consideration of multiple aspects, including texture, appearance, color, seeds, taste, aroma, the proportion of shriveled seeds, and purity, to ensure its superior quality. Therefore, it requires multiple screening processes.

[0003] Therefore, in existing technologies, manual screening and impurity removal of Schisandra chinensis is commonly used, and research and design of screening and impurity removal equipment for Schisandra chinensis are relatively limited. A search revealed a recently published invention patent document from the Poultry Research Institute of the Shandong Academy of Agricultural Sciences (Shandong Specific Pathogen-Free Chicken Research Center) that addresses this issue. The application publication number is CN118744104 A, and the publication date is October 8, 2024. The specific problem it addresses is that fallen leaves, twigs, dust, and other impurities enter the filter screen together, increasing the risk of filter clogging and reducing the efficiency of Schisandra chinensis impurity removal. The technical solution mainly includes a base plate, a feeding hopper positioned above the screening component, a discharging hopper vertically fixed at the bottom of the feeding hopper and connected to it, a discharging roller rotatably installed inside the discharging hopper with four evenly distributed annular discharging grooves on its surface, and two discharging cleaning components installed on opposite sides of the discharging hopper.

[0004] The technical solution provided by the aforementioned invention patent involves intermittently feeding Schisandra chinensis during the pre-screening process, which avoids excessive feeding at one time, resulting in stacking and accumulation that would prevent effective screening. In addition, intermittent feeding can also clean up light impurities such as fallen leaves, twigs, and dust mixed in with the Schisandra chinensis, reducing the screening load on the subsequent sieve plates and thus improving the impurity removal efficiency and effect of the equipment. However, the following problems exist: First, although feeding through the four feeding troughs on the feeding roller can achieve intermittent feeding and avoid stacking, it involves many moving parts and has a complex structure, which also reduces the feeding speed. It is only suitable for fine screening of Schisandra chinensis, but not for primary screening. Second, it can only remove impurities from Schisandra chinensis, but cannot classify and screen it. In addition, there is only one opposing air jet head and corresponding slag removal channel on the feeding path of Schisandra chinensis. If the air pressure is too high, smaller and lighter Schisandra chinensis will be blown out. If the air pressure is too low, impurities cannot be blown out. Moreover, due to the different density, size and other parameters of impurities, it is impossible to set the air pressure to an ideal state.

[0005] In conclusion, how to efficiently perform initial screening, classification, and impurity removal of Schisandra chinensis is a technical problem that urgently needs to be solved.

[0006] It should be noted that the above technical information is intended only to enhance the understanding of the overall background technology of this utility model, and should not be regarded as an admission or in any form an implication that the above technical information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] To address the shortcomings in the aforementioned background technology, this utility model proposes a multi-stage impurity removal device for the initial screening of Schisandra chinensis, which solves the technical problem that existing equipment cannot efficiently perform initial screening, classification, and impurity removal of Schisandra chinensis.

[0008] The technical solution of this application is as follows:

[0009] A multi-stage impurity removal device for the initial screening of Schisandra chinensis includes a housing and a screen unit and an air-blowing impurity removal unit arranged on the housing. The screen unit includes a primary screen, a secondary screen and a tertiary screen arranged in a zigzag pattern from top to bottom with gradually increasing mesh size. The primary screen, the secondary screen and the tertiary screen are all provided with a discharge port at their lower ends, and an impurity removal port is provided at the discharge port. The air outlet of the air-blowing impurity removal unit corresponds to the impurity removal port at the discharge port.

[0010] Preferably, the screen unit includes a vibrating motor connected to a primary screen, the primary screen and the secondary screen are connected by a spring assembly one, and the secondary screen and the tertiary screen are connected by a spring assembly two.

[0011] Preferably, the upper ends of the primary screen, secondary screen and tertiary screen are all hinged to the housing, and the lower ends are all movably fitted to the housing. A spring assembly is provided between the tertiary screen and the housing.

[0012] Preferably, the discharge port includes a primary discharge port, a secondary discharge port, and a tertiary discharge port that are adapted to the lower ends of the primary screen, the secondary screen, and the tertiary screen, respectively. The impurity removal port includes a primary impurity removal port at the primary discharge port and a secondary impurity removal port at the secondary discharge port. The air blowing impurity removal unit includes air vents that are connected to the primary discharge port and the secondary discharge port and are respectively corresponding to the left and right sides of the primary impurity removal port and the secondary impurity removal port.

[0013] Preferably, a hopper is provided on the top of the housing, a discharge pipe is provided between the hopper and the primary screen, a primary impurity removal port is provided on the side wall of the discharge pipe, and the blowing impurity removal unit includes air vents that are connected to the discharge pipe and correspond to the left and right of the primary impurity removal port.

[0014] Preferably, the primary screen, secondary screen and tertiary screen are provided with enclosures on both sides and at the lower end. The lower end of the primary screen, secondary screen and tertiary screen is triangular plate-shaped, and the tip of the triangular plate has an opening in the enclosure, which is adapted to the discharge port.

[0015] Preferably, the width of the primary impurity removal port is less than the minimum diameter of Schisandra chinensis, and the widths of the primary impurity removal port, the first-level impurity removal port, and the second-level impurity removal port gradually decrease.

[0016] Preferably, a first-stage extension pipe is connected above the first-stage discharge port, and an extension impurity removal port with a width greater than that of the primary impurity removal port is provided on the side wall of the extension pipe. The blowing impurity removal unit includes air vents corresponding to the left and right sides of the extension impurity removal port.

[0017] Preferably, a secondary extension pipe is connected above the secondary discharge port, and an extension impurity removal port 2 with a width greater than that of the primary impurity removal port is provided on the side wall of the extension pipe 2. The blowing impurity removal unit includes air outlets corresponding to the left and right sides of the extension impurity removal port 2.

[0018] Preferably, the primary impurity removal port, the first-level impurity removal port, the second-level impurity removal port, the extended impurity removal port one, and the extended impurity removal port two discharge impurities to the outside of the shell through impurity discharge channels one, two, three, four, and five with the Venturi effect, respectively.

[0019] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0020] This invention provides a multi-stage impurity removal device for the initial screening of Schisandra chinensis. Through primary, secondary, and tertiary sieves, it not only achieves multi-stage initial screening of Schisandra chinensis, thus obtaining different grades of the fruit, but also enables multi-stage dust and impurity removal via a blowing unit. Furthermore, each stage of dust and impurity removal corresponds to a specific stage of output, resulting in better dust and impurity removal efficiency. In addition, the technical solution provided by this invention requires only a few vibration motors to achieve effective vibration of each sieve. This is because: firstly, each sieve is hinged at one end and movably connected at the other; and secondly, adjacent sieves are connected by spring assemblies. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of the present invention in the first direction;

[0023] Figure 2 for Figure 1 The left view.

[0024] Explanation of icon numbers:

[0025] Shell 1; Hopper 11;

[0026] Screen unit 2; enclosure 20; enclosure opening 24; primary screen 21; secondary screen 22; tertiary screen 23;

[0027] 3. Air blowing and impurity removal unit; 30. Air duct; 31. Primary discharge port; 32. Secondary discharge port; 33. Tertiary discharge port;

[0028] Impurity removal port 4; Primary impurity removal port 40; First-level impurity removal port 41; Second-level impurity removal port 42;

[0029] Vibration motor 50; Spring assembly one 51; Spring assembly two 52; Spring assembly three 53;

[0030] Extension tube 1, 61; Secondary extension tube, 62;

[0031] Extended impurity removal port 1 71; Extended impurity removal port 2 72;

[0032] Discharge channel 1 81; Discharge channel 2 82; Discharge channel 3 83; Discharge channel 4 84; Discharge channel 5 85. Detailed Implementation

[0033] 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 core concept of the present utility model and the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] These embodiments are provided to make the application thorough and complete, and to fully express the scope of protection of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0035] It should be noted that the terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the term covers the element listed after it, and do not exclude the possibility of covering other elements as well.

[0036] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0038] A multi-stage impurity removal device for the initial screening of Schisandra chinensis, such as Figure 1 and Figure 2 As shown, it includes a housing 1 and a screen unit 2 and a blowing impurity removal unit 3 arranged on the housing 1. The screen unit 2 is used to screen Schisandra chinensis and remove impurities, while the blowing impurity removal unit 3 is used to blow away impurities dispersed in the screening and impurity removal path.

[0039] Specifically, the sieve unit 2 includes a primary sieve 21, a secondary sieve 22, and a tertiary sieve 23 arranged in a zigzag pattern from top to bottom with gradually increasing mesh size. That is, the primary, secondary, and tertiary sieves 23 are all arranged at an angle. The Schisandra chinensis entering the housing 1 first contacts the primary sieve 21. Under the screening action of the primary sieve 21, all the Schisandra chinensis roll towards the lower part of the primary sieve 21. During this rolling process, Schisandra chinensis and impurities larger than the aperture of the primary sieve 21 are retained, while those smaller are sieved down and fall onto the secondary sieve 22. Similarly, the Schisandra chinensis above the secondary sieve 22 undergoes the same process, with some Schisandra chinensis and impurities retained, while others fall onto the tertiary sieve 23. Similarly, the Schisandra chinensis on the three-stage sieve 22 undergoes the same process as described above, with some Schisandra chinensis and impurities being retained, while another portion of Schisandra chinensis passes through the three-stage sieve 23 and falls out of the shell 1.

[0040] The primary screen 21, secondary screen 22 and tertiary screen 23 are all provided with discharge ports 3 at their lower ends, and the retained Schisandra chinensis and impurities move toward the corresponding discharge ports 3.

[0041] A purification port 4 is provided at the discharge port 3, and the air vent of the blowing purification unit 3 corresponds to the purification port 4 at the discharge port 3. As the retained Schisandra chinensis and impurities move toward their respective discharge ports 3, both the Schisandra chinensis and impurities need to pass through the discharge ports. Under the action of the air vent at the discharge port 3, the lighter impurities are blown up and discharged from the shell 1 through the purification port 4, while the remaining Schisandra chinensis flows out of the discharge port 3 naturally due to gravity.

[0042] Preferably, the rolling direction of Schisandra chinensis in each sieve is as follows: Figure 1 The direction of impurity discharge under the action of the blowing and impurity removal unit 3 is left and right. Figure 2 From the top-down projection direction, the two directions mentioned above are perpendicular to each other, which saves space and improves the dust and impurity removal effect on the path of the falling Schisandra chinensis.

[0043] It should be noted that the model and working principle of the vibration motor 50 are not described in this embodiment, nor are the fan and air duct 30 in the blowing and cleaning unit 3 introduced, because this part is not the invention content of this application, and under the guidance of the technical concept of this embodiment, those skilled in the art can choose appropriate and practical technical means according to actual needs.

[0044] Based on the above embodiments, as a preferred embodiment, the screen unit 2 includes a vibration motor 50 connected to the primary screen 21. The primary screen 21 and the secondary screen 22 are connected by a spring assembly 51, and the secondary screen 22 and the tertiary screen 23 are connected by a spring assembly 52. ​​In this embodiment, under the action of each spring assembly, only a small number of vibration motors are needed to achieve effective vibration of each screen.

[0045] It is important to note that since the vibrating motor 50 is directly connected to the primary screen 21, the vibration of the primary screen 21 is the strongest, while the vibration intensity of the secondary screen 22 and the tertiary screen 23 decreases sequentially. This has no negative impact; on the contrary, it is adapted to the quantity and size of the Schisandra chinensis in each screen. Because the primary screen 21 has a large quantity of Schisandra chinensis of varying sizes and the most impurities, it is prone to stacking or clogging, thus requiring the highest vibration intensity. After the screening effect of the primary screen 21, the Schisandra chinensis on the secondary screen 22 tends to be of uniform size, and the impurities are reduced, so there is no need to increase the vibration intensity. Similarly, after the screening effect of the secondary screen 22, the Schisandra chinensis on the tertiary screen 23 is even more uniform in size and has the fewest impurities, so there is even less need to increase the vibration intensity.

[0046] Based on the above embodiments, as a preferred embodiment, the upper ends of the primary screen 21, secondary screen 22, and tertiary screen 23 are all hinged to the housing 1, and the lower ends are movably fitted to the housing 1. A spring assembly 53 is provided between the tertiary screen 23 and the housing 1. This embodiment provides a preferred arrangement of the screens, with one end hinged and the other end movably fitted, which can improve the vibration effect while maintaining a certain energy consumption. It should be noted that even without this arrangement, each screen can still achieve a vibrating effect under the action of the vibration motor 50 and the various spring assemblies.

[0047] Based on the above embodiments, as a preferred embodiment, the discharge port 4 includes a primary discharge port 31, a secondary discharge port 32, and a tertiary discharge port 33, respectively adapted to the lower ends of the primary screen 21, the secondary screen 22, and the tertiary screen 23. That is, each discharge port is arranged at the lower position of each screen. Whether it is Schisandra chinensis or impurities, they can automatically flow to the corresponding discharge port under the influence of their own weight or mutual friction, thereby achieving convenient graded discharge. It should be noted that, due to the different heights of the screens, the primary discharge port 31, the secondary discharge port 32, and the tertiary discharge port 33 are not only located at different heights, but also arranged in a zigzag pattern from top to bottom, allowing each discharge port to be positioned at different horizontal positions. Figure 1 and Figure 2As shown, the primary discharge port 31 and the tertiary discharge port 33 are located on one side of the housing 1, while the secondary discharge port 32 is located on the other side of the housing 1. This can effectively improve space utilization and facilitate the collection of different types of Schisandra chinensis by receiving tools in different positions.

[0048] The impurity removal port 4 includes a primary impurity removal port 41 at the primary discharge port 31 and a secondary impurity removal port 42 at the secondary discharge port 32. That is, although Schisandra chinensis and impurities will flow together to the discharge port 3, corresponding impurity removal ports 41 are arranged at the corresponding discharge port positions. The blowing impurity removal unit 3 includes air vents that are respectively connected to the primary discharge port 31 and the secondary discharge port 32 and are respectively corresponding to the primary impurity removal port 41 and the secondary impurity removal port 42 on the left and right. Under the action of the air vents, as Schisandra chinensis and impurities fall, the impurities will be blown away from the discharge port by the air vents and discharged through the corresponding impurity removal ports.

[0049] Based on the above embodiments, as a preferred embodiment, the top of the housing 1 is provided with a hopper 11, and a discharge pipe 12 is provided between the hopper 11 and the primary screen 21. A primary impurity removal port 40 is provided on the side wall of the discharge pipe 12, and the blowing impurity removal unit 3 includes an air outlet that communicates with the discharge pipe 12 and corresponds to the primary impurity removal port 40 on the left and right.

[0050] This implementation further improves the impurity removal effect on Schisandra chinensis. Before falling into the primary sieve 21, the Schisandra chinensis needs to pass through the feed pipe 12 and undergo primary impurity removal through the primary impurity removal port 40. It should be noted that, as Figure 1 and Figure 2 As shown, the size of the feed pipe 12 is much smaller than the size of the primary filter screen 21. At the same time, the sizes of the primary discharge port 31, the secondary discharge port 32, and the tertiary discharge port 33 are also much smaller than the sizes of the corresponding filter screens. This allows the Schisandra chinensis to pass through in small quantities and continuously, thereby enabling the corresponding air vents to more reliably blow impurities to the corresponding impurity removal ports.

[0051] Based on the above embodiments, as a preferred embodiment, the primary screen 21, the secondary screen 22 and the tertiary screen 23 are provided with enclosures 20 on both sides and at the lower end. The lower end of the primary screen 21, the secondary screen 22 and the tertiary screen 23 are all triangular plates, and the tip of the triangular plate has an enclosure opening 24, which is adapted to the discharge port 3.

[0052] This embodiment designs each screen with a special shape, rather than the common rectangle, to ensure that Schisandra chinensis or impurities do not remain in the corresponding screen for a long time. They can all enter the corresponding discharge port through the enclosure opening 24 on the enclosure 20. This also ensures that the amount of material entering the discharge port per unit time is not excessive, thus avoiding discharge port blockage and improving the impurity removal effect at each discharge port. Furthermore, it should be noted that the tilt angle of each screen in this invention is small, preventing material from overflowing the screen due to its tilt.

[0053] Based on the above embodiments, as a preferred embodiment, the width of the primary impurity removal port 40 is smaller than the minimum diameter of Schisandra chinensis, and the widths of the primary impurity removal port 40, the first-level impurity removal port 41, and the second-level impurity removal port 42 gradually decrease. This embodiment provides a more preferred technical solution, which not only ensures that Schisandra chinensis will not be discharged from the various impurity removal ports, but also sets different sizes for the impurity removal ports at different positions according to the characteristics of Schisandra chinensis and impurities after passing through each sieve, further improving the impurity removal effect.

[0054] Based on the above embodiments, as a preferred embodiment, a primary extension pipe 61 is connected above the primary discharge port 31, and an extension impurity removal port 71 with a width greater than that of the primary impurity removal port 40 is provided on the side wall of the extension pipe 61. The blowing impurity removal unit 3 includes air vents corresponding to the extension impurity removal port 71 on the left and right.

[0055] In this embodiment, the width of the extended impurity removal port 71 is greater than the width of the primary impurity removal port 40, further improving the impurity removal effect. This is because the impurity removal ports in other locations are the necessary channels for the Schisandra chinensis to fall through. If their width is arranged to be greater than the diameter of the Schisandra chinensis, the Schisandra chinensis may enter the impurity removal port under the action of the air duct 30. However, the extended impurity removal port 71 is located above the primary discharge port 31 and is not a necessary channel for the Schisandra chinensis, so there is no need for the above concern. The extended impurity removal port 71 is set to be larger in order to discharge impurities that are larger than the Schisandra chinensis but lighter in weight, such as leaves and withered grass.

[0056] Furthermore, in order to fully achieve the above effects, a secondary extension pipe 62 is connected above the secondary discharge port 32, and an extension impurity removal port 72 with a width greater than that of the primary impurity removal port 40 is provided on the side wall of the extension pipe 62. The blowing impurity removal unit 3 includes air outlets that correspond to the left and right of the extension impurity removal port 72.

[0057] Based on the above embodiments, as a preferred embodiment, the primary impurity removal port 40, the first-level impurity removal port 41, the second-level impurity removal port 42, the extended impurity removal port 1 71 and the extended impurity removal port 2 72 respectively discharge impurities to the outside of the housing 1 through the impurity discharge channels 1 81, 2 82, 3 83, 4 84 and 5 85 with Venturi effect.

[0058] That is, waste removal channels 1 (81), 2 (82), 3 (83), 4 (84), and 5 (85) all include an inlet section: a short cylindrical section with a diameter of [missing information]. D The constriction section is a conical tube with a cone angle of approximately 21° ± 2°. The throat is a short, straight tube with a diameter of approximately 1 / 3 to 1 / 4 of its length. D The length is equal to the pipe diameter; the diffuser section is a tapered pipe with a cone angle of 8° to 15°. The Venturi effect refers to the phenomenon that when fluid passes through a narrowing cross-section, the flow velocity increases and a partial vacuum is generated. Specifically, in this embodiment, when impurities flow in a gradually narrowing pipe, the flow velocity increases, the pressure decreases, reaching its lowest value at the narrowest point, and adsorbing the surrounding area, thereby improving the impurity discharge effect.

[0059] The above content shows and describes the basic principles, main features, and beneficial effects of this utility model. The above description is merely a preferred embodiment of this utility model and is not intended to limit it. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-stage impurity removal device for the initial screening of Schisandra chinensis, comprising a housing (1) and a screen unit (2) and an air blowing impurity removal unit (3) arranged on the housing (1), characterized in that: The screen unit (2) includes a primary screen (21), a secondary screen (22) and a tertiary screen (23) arranged in a zigzag pattern from top to bottom with gradually increasing mesh count. The primary screen (21), the secondary screen (22) and the tertiary screen (23) are all provided with discharge ports at their lower ends. The discharge ports are provided with impurity removal ports (4). The air outlet of the blowing impurity removal unit (3) corresponds to the impurity removal port (4) at the discharge port.

2. The multi-stage impurity removal device for the initial screening of Schisandra chinensis according to claim 1, characterized in that: The screen unit (2) includes a vibration motor (50) connected to the primary screen (21). The primary screen (21) and the secondary screen (22) are connected by a spring assembly (51), and the secondary screen (22) and the tertiary screen (23) are connected by a spring assembly (52).

3. The multi-stage impurity removal device for the initial screening of Schisandra chinensis according to claim 2, characterized in that: The upper ends of the primary screen (21), secondary screen (22) and tertiary screen (23) are all hinged to the housing (1), and the lower ends are all movablely fitted to the housing (1). A spring assembly (53) is provided between the tertiary screen (23) and the housing (1).

4. The multi-stage impurity removal device for primary screening of Schisandra chinensis according to any one of claims 1-3, characterized in that: The discharge port includes a primary discharge port (31), a secondary discharge port (32), and a tertiary discharge port (33) adapted to the lower ends of the primary screen (21), the secondary screen (22), and the tertiary screen (23), respectively. The impurity removal port (4) includes a primary impurity removal port (41) at the primary discharge port (31) and a secondary impurity removal port (42) at the secondary discharge port (32). The air blowing impurity removal unit (3) includes air vents that are connected to the primary discharge port (31) and the secondary discharge port (32) respectively and are corresponding to the left and right sides of the primary impurity removal port (41) and the secondary impurity removal port (42) respectively.

5. The multi-stage impurity removal device for the initial screening of Schisandra chinensis according to claim 4, characterized in that: The top of the housing (1) is provided with a hopper (11), and a feed pipe (12) is provided between the hopper (11) and the primary screen (21). A primary impurity removal port (40) is provided on the side wall of the feed pipe (12). The blowing impurity removal unit (3) includes an air outlet that is connected to the feed pipe (12) and corresponds to the primary impurity removal port (40) on the left and right.

6. The multi-stage impurity removal device for primary screening of Schisandra chinensis according to claim 5, characterized in that: The primary screen (21), secondary screen (22) and tertiary screen (23) are all provided with enclosures (20) on both sides and at the lower end. The lower end of the primary screen (21), secondary screen (22) and tertiary screen (23) is triangular plate-shaped, and the tip of the triangular plate-shaped enclosure has an opening (24) that is adapted to the discharge port.

7. The multi-stage impurity removal device for primary screening of Schisandra chinensis according to claim 5 or 6, characterized in that: The width of the primary impurity removal port (40) is smaller than the minimum diameter of Schisandra chinensis, and the widths of the primary impurity removal port (40), the first-level impurity removal port (41), and the second-level impurity removal port (42) gradually decrease.

8. The multi-stage impurity removal device for primary screening of Schisandra chinensis according to claim 7, characterized in that: A primary extension pipe (61) is connected above the primary discharge port (31). An extension impurity removal port (71) with a width greater than that of the primary impurity removal port (40) is provided on the side wall of the primary extension pipe (61). The blowing impurity removal unit (3) includes air vents corresponding to the left and right of the extension impurity removal port (71).

9. The multi-stage impurity removal device for the initial screening of Schisandra chinensis according to claim 8, characterized in that: A secondary extension pipe (62) is connected above the secondary discharge port (32). An extension impurity removal port two (72) with a width greater than that of the primary impurity removal port (40) is provided on the side wall of the secondary extension pipe (62). The blowing impurity removal unit (3) includes air outlets corresponding to the left and right of the extension impurity removal port two (72).

10. The multi-stage impurity removal device for primary screening of Schisandra chinensis according to claim 9, characterized in that: The primary impurity removal port (40), the first-level impurity removal port (41), the second-level impurity removal port (42), the first extension impurity removal port (71), and the second extension impurity removal port (72) respectively discharge impurities to the outside of the shell (1) through the first (81), the second (82), the third (83), the fourth (84), and the fifth (85) impurity removal channels with Venturi effect.

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