A chuan-chenpi screening device, system and method

Abstract

This invention pertains to the field of Sichuan tangerine peel, specifically relating to a screening device, system, and method for Sichuan tangerine peel. It includes a screening cylinder with an air inlet on its side wall and an exhaust outlet on its top. Airflow enters the screening cylinder through the air inlet and exits through the exhaust outlet. A feed inlet is located on the upper side wall of the screening cylinder, allowing Sichuan tangerine peel to enter. Inside the screening cylinder, the peel is suspended by the upward-flowing airflow, performing initial impurity screening. A sieve plate is located at the lower end of the screening cylinder, below the air inlet, and serves to receive and perform secondary impurity screening of the peel. This invention provides a Sichuan tangerine peel screening device, system, and method to address the problem of high breakage rate of Sichuan tangerine peel when using mechanical vibrating screens in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of Sichuan tangerine peel, specifically relating to a Sichuan tangerine peel screening device, system, and method. Background Technology

[0002] Sichuan tangerine peel is the dried, mature peel of the citrus fruit and its cultivated varieties, belonging to the Rutaceae family. It is mainly produced in the Sichuan Basin and surrounding areas. Due to its warm nature, pungent and bitter taste, and its affinity for the spleen and lung meridians, Sichuan tangerine peel has the effects of regulating qi and strengthening the spleen, as well as drying dampness and resolving phlegm. It is widely used in traditional Chinese medicine clinical practice and the health industry. In particular, the high-quality Sichuan tangerine peel produced by the applicant has received especially high market acclaim.

[0003] In the traditional processing and production system of Sichuan tangerine peel, the initial screening of dried peel is not only a crucial link between the front-end drying process and the back-end long-term aging and storage, but also a key step in removing non-medicinal impurities such as mud, stones, fruit stems, moldy pieces, and debris. The cleanliness of the initial screening directly lays the material foundation for the subsequent years of natural aging, profoundly affecting the efficacy stability and market value of Sichuan tangerine peel slices. Currently, the industry still widely uses traditional mechanical vibrating sieving or manual sieving for the impurity removal of dried Sichuan tangerine peel. The basic principle is to place the tangerine peel on a screen with a specific mesh size, and rely on the movement of the screen to cause relative displacement of the material on the screen surface, thereby achieving the separation of impurities smaller than the screen aperture size.

[0004] However, in practice, it has been found that when screening using a mechanical vibrating screen, the dried Sichuan tangerine peel is brittle and hard, and its geometric shape is extremely irregular (often curled, flake-like, or irregularly shaped) due to differences in citrus growth and peeling methods. The edges of the peel are easily stuck in the screen holes. During the vibration process, the stuck peel rubs against other pieces, causing it to break. Sichuan tangerine peel is valued for its thin, intact peel; its appearance is a core indicator for grading and pricing. Physical damage caused during screening not only directly leads to the downgrading of high-grade tangerine peel but also accelerates the loss of volatile oils due to damage to the oil chambers, severely impairing the economic and medicinal value of the herb. Summary of the Invention

[0005] This invention provides a Sichuan tangerine peel screening device, system, and method, the purpose of which is to solve the problem of high breakage rate of Sichuan tangerine peel when using mechanical vibrating screens for screening in the prior art.

[0006] To achieve the above objectives, the present invention provides a screening device for dried tangerine peel, including a screening cylinder. An air inlet is provided on the side wall of the screening cylinder, and an exhaust port is provided on the top of the screening cylinder. Airflow can enter the interior of the screening cylinder through the air inlet and exit through the exhaust port, so that a vertically upward airflow is formed inside the screening cylinder. The upper side wall of the screening cylinder is provided with a feed inlet, which is used to allow Sichuan tangerine peel to enter the screening cylinder. When the Sichuan tangerine peel is inside the screening cylinder, it is suspended by the vertically upward airflow and initially screened for impurities. A sieve plate is provided at the lower end of the screening cylinder. The sieve plate is located below the air inlet. The sieve plate is used to receive Sichuan tangerine peel and to achieve secondary impurity screening of the Sichuan tangerine peel.

[0007] Preferably, the air inlets are arranged in a ring shape, and the outer wall of the screening cylinder is provided with an airflow distribution cavity. The airflow distribution cavity is ring-shaped and covers the air inlets. The interior of the ring-shaped buffer cavity is connected to the air inlets, and the inlet of the ring-shaped buffer cavity is connected to the air source.

[0008] Preferably, the air inlet is disposed on the air inlet plate, and multiple air inlets are provided; The air intake plate is annular, and the annular buffer cavity encloses the air intake plate.

[0009] Preferably, the air inlet includes a first air inlet and a second air inlet. The first air inlet is horizontally positioned and outputs horizontal airflow into the screening cylinder. The second air inlet is obliquely upward positioned and outputs obliquely upward airflow into the screening cylinder. The first air inlet is positioned above the second air inlet, causing the two airflows to converge and form turbulence.

[0010] Preferably, the first air inlet and the second air inlet are located on the same vertical plane, and the number of the first air inlet and the second air inlet are equal.

[0011] The second air inlet is angled upwards at 45°~60°.

[0012] Preferably, the sieve plate is installed on the screening cylinder via a pull-out structure, so that the sieve plate can be separated from the screening cylinder.

[0013] Preferably, the inner wall of the screening cylinder is provided with a guide ring, through which the dried tangerine peel is guided to gather in the middle of the sieve plate.

[0014] Preferably, the feed inlet is equipped with an auxiliary airflow inlet, through which auxiliary airflow is delivered into the feed inlet.

[0015] The second aspect of the present invention discloses a Sichuan tangerine peel screening system, including the above-mentioned Sichuan tangerine peel screening device, a gas source and an exhaust dust removal module, wherein the gas source is in communication with the air inlet of the Sichuan tangerine peel screening device, and the exhaust dust removal module is in communication with the exhaust outlet of the Sichuan tangerine peel screening device.

[0016] A third aspect of the present invention discloses a method using the above-mentioned Sichuan tangerine peel screening device, comprising the following steps: S1, set the screening airflow to flow vertically upwards; S2, Sichuan tangerine peel is introduced into the screening airflow, and the Sichuan tangerine peel is initially separated from impurities by the vertical airflow; S3 uses a sieve plate to receive Sichuan tangerine peel, and separates the tangerine peel from impurities through the sieve plate.

[0017] The beneficial effects of this invention are as follows: This device uses airflow suspension combined with a sieve plate to replace traditional mechanical vibration screening. Compared with traditional vibrating screens, it eliminates the problem of material jamming and friction caused by screen vibration, reducing the breakage rate of Sichuan tangerine peel during the screening process and minimizing economic losses due to damage and downgrading. Furthermore, this device has a simple structure and can complete the screening operation with an external air source, making it more cost-effective than large vibrating screen equipment. Attached Figure Description

[0018] Figure 1 This is a perspective view of a Sichuan tangerine peel screening device in Example 1.

[0019] Figure 2 This is a cross-sectional view of a Sichuan tangerine peel screening device in Example 1.

[0020] Figure 3 This is a schematic diagram of the gas flow and movement of Sichuan tangerine peel in a screening device for Sichuan tangerine peel in Example 1.

[0021] Figure 4 This is a perspective view of a Sichuan tangerine peel screening device in Example 2.

[0022] Figure 5 This is a cross-sectional view of a Sichuan tangerine peel screening device in Example 2.

[0023] Figure 6 This is a cross-sectional view of the airflow distribution cavity in Example 2.

[0024] Figure 7 This is a schematic diagram of gas flow at the first and second air inlets in Example 3.

[0025] Figure 8 This is a schematic diagram showing the annular distribution of the first and second air inlets in Example 3. (The annular perforated plate is unfolded.) Figure 9 This is a schematic diagram of the feed inlet and auxiliary airflow inlet in the 4th generation of the power system.

[0026] The attached reference numerals include: screening cylinder 1, exhaust port 2, feed port 3, air inlet 4, first air inlet 41, second air inlet 42, sieve plate 5, guide ring 6, airflow distribution chamber 7, and auxiliary airflow inlet 8. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0028] The implementation examples are basically as follows Figures 1-3 As shown, a screening device for Sichuan tangerine peel has the main function of screening the processed Sichuan tangerine peel after the drying process is completed, thereby removing non-medicinal impurities such as mud, stones, fruit stems and debris.

[0029] The Sichuan tangerine peel sorting device of this embodiment includes a vertically arranged sorting cylinder 1. The sorting cylinder 1 has a cylindrical overall shape and a supporting foot at the bottom. An air inlet 4 is opened on the middle side wall of the sorting cylinder 1, and an exhaust port 2 is opened at the top of the sorting cylinder 1. The air inlet 4 can be connected to an external air source, and the exhaust port 2 is used for exhaust. In the working state, the airflow enters the interior of the sorting cylinder 1 through the air inlet 4 and flows upward along the vertically arranged sorting cylinder 1, forming a stable vertical upward airflow field inside the sorting cylinder 1. During the sorting of Sichuan tangerine peel, the specific flow rate of the airflow is adjusted according to the specific size of the Sichuan tangerine peel.

[0030] In this embodiment, a feed inlet 3 is provided on the upper side wall of the screening cylinder 1. The feed inlet 3 is located between the air inlet 4 and the exhaust port 2, that is, the feed inlet 3 is below the exhaust port 2 and above the air inlet 4. The feed inlet 3 is used to allow the dried Sichuan tangerine peel to enter the screening cylinder 1. When the Sichuan tangerine peel enters the screening cylinder 1 through the feed inlet 3, it will be impacted by the vertically upward airflow. Due to the difference in weight between the Sichuan tangerine peel and light impurities (such as mud and debris), the upward airflow can blow up the light impurities, which are discharged outward from the exhaust port 2 with the airflow, while the heavier Sichuan tangerine peel will be suspended or semi-suspended in the airflow and eventually fall downward.

[0031] It should be noted that when Sichuan tangerine peel is placed in a flowing airflow, the airflow continuously washes over its surface, causing even firmly attached impurities to be gradually peeled off and detached. This airflow-driven treatment effectively helps to further remove impurities from the tangerine peel with minimal damage.

[0032] To prevent impurities from leaking from the feed inlet 3, this embodiment includes a sealing plate at the feed inlet 3. The sealing plate is removable and installed at the feed inlet 3. When the sealing plate is inserted into the feed inlet 3, it blocks and closes the feed inlet 3. When feeding is needed, the sealing plate can be simply removed from the feed inlet 3.

[0033] In this embodiment, a sieve plate 5 is provided at the lower end of the screening cylinder 1, and the sieve plate 5 is located below the air inlet 4. After the Sichuan tangerine peel passes through the airflow screening, it will fall onto the sieve plate 5. The sieve plate 5 has several sieve holes evenly distributed on it, and the sieve plate 5 performs secondary screening of the Sichuan tangerine peel. During the secondary screening process, impurities such as stones and fruit stems will fall through the sieve holes, while qualified Sichuan tangerine peel will remain on the surface of the sieve plate 5.

[0034] After screening, to remove the screened Sichuan tangerine peel from the sieve plate 5, in this embodiment, the sieve plate 5 is installed on the screening cylinder 1 via a pull-out structure. Specifically, an opening matching the size of the sieve plate 5 is made on the lower side wall of the screening cylinder 1, and a handle is connected to the edge of the sieve plate 5. The sieve plate 5 can slide horizontally out of the screening cylinder 1 through the opening, thus separating the sieve plate 5 from the screening cylinder 1. The screened Sichuan tangerine peel is then manually removed. Care must be taken when manually picking up the Sichuan tangerine peel to avoid damaging it.

[0035] To prevent Sichuan tangerine peel from scattering onto the edge of the sieve plate 5 during its descent, and to prevent it from falling off the sieve plate 5 when it is pulled out, a guide ring 6 is provided on the inner wall of the screening cylinder 1 in this embodiment. The guide ring 6 is located below the air inlet 4 and above the sieve plate 5. The guide ring 6 has a funnel-shaped structure with its large end facing upwards and its small end facing downwards. The guide ring 6 is used to receive the Sichuan tangerine peel after it has been screened by the airflow and guide it to gather in the middle area of ​​the sieve plate 5. At the same time, considering that Sichuan tangerine peel is relatively brittle and easily broken, the guide ring 6 is made of a flexible material, such as silicone or rubber. When the Sichuan tangerine peel falls onto the guide ring 6, the flexible material can absorb the impact energy through elastic deformation, reduce the impact force of the falling Sichuan tangerine peel, and reduce the breakage rate of the peel. At the same time, a flexible buffer layer can also be provided on the surface of the sieve plate 5 to prevent the Sichuan tangerine peel from colliding hard with the sieve plate 5. The flexible buffer layer can be a foam layer. The flexible buffer layer has through holes corresponding to the sieve holes.

[0036] In order to clean the impurities screened out by the sieve plate 5, an impurity outlet that can be opened and closed is provided at the bottom of the screening cylinder 1 in this embodiment, so that the impurities screened out by the sieve plate 5 can be discharged to the outside through the impurity outlet.

[0037] The following detailed description of the specific implementation method is as follows: During operation, a stable vertical upward airflow is first formed inside the screening cylinder 1; then, the Sichuan tangerine peel to be screened is fed into the screening cylinder 1 through the feed inlet 3; after the Sichuan tangerine peel enters, lighter impurities such as mud, sand, and debris are carried upward by the airflow and finally discharged from the exhaust port 2, completing the initial screening of the Sichuan tangerine peel; while qualified Sichuan tangerine peel falls onto the sieve plate 5 under the action of gravity, and impurities such as stones and hard fruit stems with a volume smaller than the sieve hole diameter fall through the sieve hole, completing the secondary impurity screening; after the screening operation is completed, the screened Sichuan tangerine peel can be taken out by pulling out the sieve plate 5.

[0038] To ensure better screening results, the screened Sichuan tangerine peel can be reintroduced into screening tube 1 for further screening.

[0039] Example 2 This embodiment is an improvement on embodiment 1. In embodiment 1, the screening cylinder 1 takes in air through an air inlet 4. Obviously, when the Sichuan tangerine peel falling downwards reaches the area of ​​the air inlet 4, the Sichuan tangerine peel is easily impacted by the airflow of the air inlet 4 and collides with the inner wall of the screening cylinder 1, thereby causing the Sichuan tangerine peel to break.

[0040] Therefore, in order to solve this problem, such as Figures 4-6 As shown, in this embodiment, the air inlet 4 is constructed on an air inlet plate, which is annular and integrally formed with the screening cylinder 1. All air inlets 4 on the annular plate are straight holes, and multiple air inlets 4 are arranged in an array. The air inlets 4 are distributed in a ring. An airflow distribution chamber 7, also annular, surrounds the outside of the air inlets 4. The interior of the airflow distribution chamber 7 communicates with the air inlets 4, and a pipe can be installed at the inlet of the airflow distribution chamber 7 to connect to an external air source. Therefore, during air intake, the airflow first enters the airflow distribution chamber 7 and then enters the screening cylinder 1 through the air inlets 4 on the annular plate. This air intake method allows the airflow to enter the screening cylinder 1 more dispersedly, thereby avoiding the impact of unilateral airflow on the dried tangerine peel. Simultaneously, to make the airflow more dispersed and uniform, this embodiment provides a flow guide component inside the airflow distribution chamber 7 to disperse the airflow within the airflow distribution chamber 7.

[0041] Example 3 This embodiment is an improvement upon embodiment 2, in which all airflow directions were relatively consistent and the airflow was relatively stable. However, a chaotic airflow can obviously impact different areas of the dried tangerine peel, thus improving the impurity removal effect.

[0042] Based on this, such as Figure 7 and Figure 8As shown, in this embodiment, the air inlet 4 is divided into a first air inlet 41 and a second air inlet 42. The number of first air inlets 41 and second air inlets 42 is equal. The first air inlet 41 is located above the second air inlet 42, and both are located in the same vertical plane. The first air inlet 41 is horizontally positioned, allowing airflow to be delivered horizontally into the screening cylinder 1. The second air inlet 42 is obliquely upward positioned (preferably at an angle of 45° to 60°), allowing airflow to enter the screening cylinder 1 at an obliquely upward angle. Therefore, when the airflow enters the screening cylinder 1, the obliquely upward airflow from the second air inlet 42 and the horizontal airflow from the first air inlet 41 converge and collide inside the screening cylinder 1. This interaction of airflows from different directions breaks the laminar flow state of a single airflow, thereby forming a strong turbulent zone inside the screening cylinder 1. The turbulence can wash the tangerine peel from multiple angles, allowing the light impurities attached to the folds and surface of the tangerine peel to be more fully peeled off and blown away.

[0043] It should be noted that in this embodiment, the second air inlet 42 is preferably between 45° and 60°. At this angle, on the one hand, turbulence is generated when the upward-sloping airflow meets the horizontal airflow; on the other hand, this angle reduces the blind zone when the first air inlet 41 and the second air inlet 42 do not meet, preventing the dried tangerine peel from bypassing the turbulent zone. Simultaneously, since the air intake of the upward-sloping second air inlet 42 is affected compared to the first air inlet 41, the diameter of the second air inlet 42 is larger than the diameter of the first air inlet 41.

[0044] To create a more complex turbulent flow, this embodiment preferably employs a differentiated design for the height of each group of air inlets on the air inlet plate. Specifically, a first air inlet 41 located in a certain axial direction and a second air inlet 42 below it form a group, while another group of first air inlets 41 and second air inlets 42 adjacent to it in the circumferential direction has a certain height difference relative to this group. All groups of first air inlets 41 and second air inlets 42 are distributed in a wave-like pattern in the circumferential direction. In this state, the horizontal airflow from different groups of first air inlets 41 and the obliquely upward airflow from second air inlets 42 no longer collide on the same horizontal cross section, but converge at different horizontal height levels inside the screening cylinder 1. This spatial misalignment makes the converging airflow more complex, resulting in more complex turbulence. Throughout the entire descent process, the dried tangerine peel is continuously impacted by airflows from different directions and angles at multiple height levels.

[0045] It should be noted that in this embodiment, the distribution of the air outlet is preferably designed as a wave-shaped structure. Compared with other distribution states (such as the arrangement of the four groups of air inlets with successively decreasing heights), the wave-shaped state can ensure that airflow convergence is achieved at multiple height levels, while also avoiding the problem of insufficient airflow streams converging at each height level, thus reducing the complexity of turbulence.

[0046] Example 4 This embodiment is an improvement on embodiment 1. In the scheme of embodiment 1, the Sichuan tangerine peel falls into the screening cylinder 1 only by gravity. Therefore, the Sichuan tangerine peel exhibits a significant skewed distribution due to gravity, that is, there is more material on the side near the feed inlet 3, while there is less material in the middle of the screening cylinder 1 and on the side opposite to the feed inlet 3. This uneven distribution of Sichuan tangerine peel affects the screening effect.

[0047] Therefore, this embodiment addresses the above-mentioned problems, such as Figure 9 As shown, an auxiliary airflow inlet 8 is added to the upper side wall of the feed inlet 3, and the outlet direction of the auxiliary airflow inlet 8 is obliquely downward. Therefore, during feeding, the auxiliary airflow inlet 8 delivers airflow into the feed inlet 3, increasing the initial kinetic energy and thrust of the falling Sichuan tangerine peel, causing some of the Sichuan tangerine peel to move towards the middle of the conveying cylinder and the opposite side of the feed inlet 3, thus improving the radial distribution uniformity of the material in the cylinder. At the same time, the auxiliary airflow can appropriately block the airflow inside the screening cylinder 1 from flowing towards the feed inlet 3, preventing impurities from leaking from the feed inlet 3.

[0048] In this embodiment, the auxiliary airflow is a pulsed airflow, meaning that the airflow velocity of the auxiliary airflow increases and decreases intermittently and regularly, exhibiting periodic fluctuations. Therefore, the Sichuan tangerine peel entering at different times will be subjected to intermittent pulse thrust, and the magnitude of the instantaneous transport force obtained by the Sichuan tangerine peel at different times will dynamically change. Under this state, the inertial aggregation tendency of the Sichuan tangerine peel will be broken, prompting the Sichuan tangerine peel to achieve more complete radial diffusion and spatial dispersion inside the screening cylinder 1, resulting in a more uniform distribution of the Sichuan tangerine peel inside the screening cylinder 1.

[0049] Example 5 This embodiment improves upon embodiment 4. To enhance intelligence, the length of the feed pipe is increased, and a visual detector and a through-beam photoelectric sensor are installed inside the feed pipe. The visual detector is used to collect and analyze the geometric contour and size characteristics of the Sichuan tangerine peel in real time, while the through-beam photoelectric sensor roughly determines the total amount of Sichuan tangerine peel that has passed through by observing the time it takes for the peel to block the signal. The visual detector and the through-beam photoelectric sensor are connected to the controller, which is also connected to a pulsed gas source. The controller can be a PLC control module.

[0050] In this embodiment, the visual detector and the through-beam photoelectric sensor collect size grading data and time data and transmit them to the controller. The controller processes the data and dynamically adjusts the output parameters of the pulse gas source to ensure that the airflow speed and total gas volume output by the pulse gas source match the Sichuan tangerine peel.

[0051] Example 6 This embodiment provides a Sichuan tangerine peel screening system, including a Sichuan tangerine peel screening device, an air source, an exhaust dust removal module, and a feeding module, as described in any one of Embodiments 1 to 5.

[0052] In this embodiment, the air source provides airflow support for the screening process. The air source can be a centrifugal fan or an air compressor. The output end of the air source is connected to the tangerine peel screening device through a pipe, thereby forming a vertically upward high-speed airflow field inside the screening cylinder 1.

[0053] In this embodiment, the exhaust dust removal module is connected to the exhaust port 2 of the Sichuan tangerine peel screening device and is used to treat the dust-laden exhaust gas generated during the screening process. Specifically, the exhaust dust removal module includes a dust removal pipe and a bag filter (or cyclone dust collector) connected in sequence. The airflow discharged from the exhaust port 2 at the top of the screening cylinder 1 carries light impurities (such as mud, sand, and debris) blown up by the airflow. The dust-laden gas enters the bag filter (or cyclone dust collector) through the dust removal pipe. The bag filter (or cyclone dust collector) intercepts and collects the impurities, and the purified air is discharged into the atmosphere.

[0054] In this embodiment, the feeding module is connected to the inlet 3 of the Sichuan tangerine peel screening device. The feeding module includes a storage hopper and a flexible connecting pipe. The storage hopper is used to temporarily store the Sichuan tangerine peel raw materials to be screened. The bottom of the storage hopper is connected to the inlet 3 at the upper end of the screening cylinder 1 through the flexible connecting pipe. The storage hopper is positioned higher than the screening cylinder 1. Under the action of gravity, the Sichuan tangerine peel in the storage hopper enters the interior of the screening cylinder 1 through the flexible connecting pipe.

[0055] It should be noted that during the feeding process via the feeding module, physical damage to the Sichuan tangerine peel may occur due to friction. Therefore, in some implementations, the feeding operation can be performed manually by the operator. During manual feeding, care should be taken to operate gently and carefully to avoid causing unnecessary damage to the Sichuan tangerine peel.

[0056] Example 7 This embodiment provides a method for screening Sichuan tangerine peel, including the following steps; S1, set the screening airflow to flow vertically upwards, the screening airflow enters from the bottom and exits from the top, the screening airflow is in a vertical flow state; S2, Sichuan tangerine peel is introduced into a vertically flowing screening airflow. When the Sichuan tangerine peel comes into contact with the screening airflow, the screening airflow will initially separate light impurities (such as mud and debris) from the Sichuan tangerine peel. S3, using sieve plate 5 to receive the Sichuan tangerine peel falling from the screening airflow. Since sieve plate 5 is provided with sieve holes, impurities such as stones and fruit stems can fall through the sieve holes while the intact Sichuan tangerine peel remains on sieve plate 5, thus realizing the secondary separation of Sichuan tangerine peel and impurities.

[0057] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for screening Sichuan tangerine peel, characterized in that: The filter includes a screening cylinder, with an air inlet on the side wall and an exhaust outlet on the top. Airflow can enter the filter cylinder through the air inlet and exit through the exhaust outlet, creating a vertically upward airflow inside the filter cylinder. The upper side wall of the screening cylinder is provided with a feed inlet, which is used to allow Sichuan tangerine peel to enter the screening cylinder. When the Sichuan tangerine peel is inside the screening cylinder, it is suspended by the vertically upward airflow and initially screened for impurities. A sieve plate is provided at the lower end of the screening cylinder. The sieve plate is located below the air inlet. The sieve plate is used to receive Sichuan tangerine peel and to achieve secondary impurity screening of the Sichuan tangerine peel.

2. The Sichuan tangerine peel screening device according to claim 1, characterized in that: The air inlets are arranged in a ring shape, and an airflow distribution cavity is provided on the outer wall of the screening cylinder. The airflow distribution cavity is ring-shaped and covers the air inlets. The interior of the ring-shaped buffer cavity is connected to the air inlets, and the inlet of the ring-shaped buffer cavity is connected to the air source.

3. The Sichuan tangerine peel screening device according to claim 2, characterized in that: The air inlet is provided on the air inlet plate, and there are multiple air inlets; The air intake plate is annular, and the annular buffer cavity encloses the air intake plate.

4. The Sichuan tangerine peel screening device according to claim 3, characterized in that: The air inlet includes a first air inlet and a second air inlet. The first air inlet is horizontally positioned and outputs horizontal airflow into the screening cylinder. The second air inlet is obliquely upward positioned and outputs obliquely upward airflow into the screening cylinder. The first air inlet is positioned above the second air inlet, causing the two airflows to converge and form turbulence.

5. The Sichuan tangerine peel screening device according to claim 4, characterized in that: The first air inlet and the second air inlet are located on the same vertical plane, and the number of the first air inlet and the second air inlet are equal; and / or; The second air inlet is angled upwards at 45°~60°.

6. The Sichuan tangerine peel screening device according to claim 1, characterized in that: The sieve plate is installed on the screening cylinder via a pull-out structure, allowing the sieve plate to be separated from the screening cylinder.

7. The Sichuan tangerine peel screening device according to claim 6, characterized in that: The inner wall of the screening cylinder is provided with a guide ring, which guides the dried tangerine peel to gather in the middle of the sieve plate.

8. The Sichuan tangerine peel screening device according to claim 1, characterized in that: The feed inlet is equipped with an auxiliary airflow inlet, through which auxiliary airflow is delivered into the feed inlet.

9. A screening system for Sichuan tangerine peel, characterized in that: The device includes the Sichuan tangerine peel screening device, the air source, and the exhaust dust removal module as described in any one of claims 1 to 8, wherein the air source is in communication with the air inlet of the Sichuan tangerine peel screening device, and the exhaust dust removal module is in communication with the exhaust outlet of the Sichuan tangerine peel screening device.

10. A method using the Sichuan tangerine peel screening device according to any one of claims 1 to 8, characterized in that: Includes the following steps, S1, set the screening airflow to flow vertically upwards; S2, Sichuan tangerine peel is introduced into the screening airflow, and the Sichuan tangerine peel is initially separated from impurities by the vertical airflow; S3 uses a sieve plate to receive Sichuan tangerine peel, and separates the tangerine peel from impurities through the sieve plate.

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