Intelligent integrated equipment and method for dust removal and grading screening of pu'er tea

Abstract

This invention discloses an intelligent integrated device and method for dust removal, grading, and screening of Pu-erh tea. It includes a frame and a sequentially arranged disturbance charging chamber, a flexible grading and screening mechanism, and a gas-solid separation and collection mechanism. The disturbance charging chamber is equipped with a pulse airflow generator and a corona charging component to disperse tea leaves and charge dust particles. The flexible grading and screening mechanism includes a sealed cover, a flexible spiral grading sieve cylinder, and a servo motor. The inner wall of the sieve cylinder is equipped with spiral guide blades. The servo motor drives the sieve cylinder to generate a composite motion of low-speed rotation and high-frequency micro-torsion, achieving dual grading based on geometric dimensions and resilience. The gas-solid separation and collection mechanism includes a cyclone separator, an electrostatic precipitator, and an induced draft fan, forming a negative pressure through-flow channel for grading and collecting charged dust particles. This invention integrates dust removal and grading functions, achieving low-damage, multi-dimensional grading through a flexible sieve cylinder and composite motion, significantly improving processing efficiency and finished product quality.

Description

Technical Field

[0001] This invention relates to the field of tea processing technology, and in particular to an intelligent integrated device and method for dust removal, grading and screening of Pu'er tea. Background Technology

[0002] In the processing of Pu'er tea, the raw tea leaves need to undergo dust removal and grading to remove dust, broken pieces, and inferior leaves. Existing equipment usually separates dust removal and grading into different stations. For example, vibrating screens or drum screens are used for size grading, and then air separators or electrostatic precipitators are used for separate dust removal. This division of labor stems from the difficulty in coordinating the dust removal airflow and the sieving motion in terms of mechanism. Therefore, in practice, separate equipment is often used to operate sequentially.

[0003] However, in the existing technology, the dust removal function and the classification function of the processing equipment are isolated from each other and lack coordination. Moreover, dust stripping and particle classification are completed in two independent processes, resulting in lengthy equipment and multiple material transfers. This leads to low overall processing efficiency and a single classification dimension, which cannot simultaneously meet the processing requirements of efficient dust removal and fine classification. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent integrated device and method for dust removal, grading and screening of Pu'er tea, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A smart integrated device for dust removal, grading and screening of Pu'er tea includes a frame, on which a disturbance charging chamber, a flexible grading and screening mechanism and a gas-solid separation and collection mechanism are arranged in sequence. The flexible grading and screening mechanism includes a sealed cover, a spiral flexible grading screen cylinder, and a servo motor. The spiral flexible grading screen cylinder is horizontally or inclinedly arranged inside the sealed cover, and the servo motor is drivenly connected to the spiral flexible grading screen cylinder. The sealed cover has a feed end near the disturbance charging chamber, an exhaust port is provided above the end of the sealed cover near the gas-solid separation and collection mechanism, and the spiral flexible grading screen cylinder has a discharge end away from the disturbance charging chamber. The disturbance charging chamber includes a housing, a pulse airflow generator, and a corona charging assembly. The corona charging assembly is located inside the housing, and the pulse airflow generator is located outside the housing with its nozzle extending into the housing. The top of the housing has a feed inlet, and the bottom of the housing has a discharge outlet. The discharge outlet is connected to the feed inlet at the end of the sealing cover via a discharge pipe. The gas-solid separation and collection mechanism includes a cyclone separator, an electrostatic precipitator, and an induced draft fan. The air inlet of the cyclone separator is connected to the exhaust port above the sealed cover through an air inlet pipe. The air outlet of the cyclone separator is connected to the air inlet of the electrostatic precipitator through an exhaust pipe. The exhaust port of the electrostatic precipitator is connected to the induced draft fan.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the spiral flexible grading screen cylinder is made of flexible silicone or flexible polyurethane material, and the inner wall of the spiral flexible grading screen cylinder is provided with spiral guide blades.

[0008] Furthermore, the servo motor drives the spiral flexible grading screen cylinder to generate a composite motion of rotational motion and torsional vibration. The rotational motion is a low-speed rotation of 5 to 30 rpm, and the torsional vibration is a high-frequency micro-amplitude torsion with a frequency of 10 to 80 Hz and a torsion angle of 0.5 to 2.

[0009] Furthermore, the spiral flexible grading screen cylinder is divided into multiple grading regions along the axial direction, and each grading region is provided with screen holes of different diameters.

[0010] Furthermore, the bottom of the sealing cover is provided with a receiving hopper along the axial direction corresponding to each of the grading areas, and a rotary unloading valve is installed at the outlet of each receiving hopper.

[0011] Furthermore, the feed end of the sealing cover is provided with a rotary seal, and the end of the discharge pipe is inserted into the rotary seal and communicates with the spiral flexible grading screen cylinder.

[0012] Furthermore, the corona charging assembly includes a high-voltage electrode and a grounding plate. The high-voltage electrode is fixed to the top of the housing and extends downward to the middle of the housing, while the grounding plate is located on the inner wall of the housing.

[0013] Furthermore, a guide plate is installed at the jet nozzle of the pulse airflow generator, which deflects the airflow direction of the jet nozzle to an angle of 30 to 90 degrees with the direction of tea material conveying.

[0014] A method for dust removal, grading, and screening of Pu-erh tea, characterized by the following steps: S10: Send the raw tea leaves to be processed into the disturbance charging chamber, start the pulse airflow generator to disperse the tea leaves, and at the same time start the corona charging component to charge the dust particles that have detached from the tea leaves. S20: The tea leaves processed by S10 are fed into the spiral flexible grading screen cylinder. The servo motor drives the screen cylinder to move in a low-speed rotation superimposed with high-frequency micro-torsion, so that the tea leaves are discharged from the discharge end of the spiral flexible grading screen cylinder and the screen holes respectively based on the differences in geometric size and toughness. S30: Start the induced draft fan so that the airflow carrying charged dust passes through the cyclone separator and electrostatic precipitator in sequence to separate coarse dust and capture fine dust respectively; S40: Collects tea leaves discharged from the outlet end of the spiral flexible grading screen and tea leaves discharged from each grading zone on the spiral flexible grading screen.

[0015] Furthermore, in step S10, the airflow pressure of the pulse airflow generator is 0.2–0.8 MPa, the pulse frequency is 5–15 Hz, and the discharge voltage of the corona charging component is 5–25 kV.

[0016] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects: This invention integrates a disturbance charging chamber, a flexible grading and screening mechanism, and a gas-solid separation and collection mechanism sequentially on the same frame. A closed, continuous airflow channel is formed by a sealed cover, discharge pipe, inlet pipe, and exhaust pipe, allowing the dust removal and grading processes to occur simultaneously within the same equipment. This eliminates the need for multiple material transfers between different workstations, significantly simplifying the processing flow and improving overall efficiency. The disturbance charging chamber is equipped with both a pulse airflow generator and a corona charging component. The pulse airflow disperses and removes surface dust from the raw tea leaves within the chamber, while the corona charging component charges the dust particles detached from the tea leaves. This combination effectively separates dust from the tea leaves and creates charge marking conditions for subsequent dust removal, avoiding interference from airflow on the screening trajectory found in traditional separate equipment. The flexible grading and screening mechanism is made of food-grade silicone or polyurethane. A spiral flexible grading sieve cylinder made of flexible materials such as esters generates a composite motion of low-speed rotation and high-frequency micro-torsion driven by a servo motor. The low-speed rotation, combined with the inner spiral guide blades, achieves preliminary grading based on geometric dimensions, while the high-frequency micro-torsion utilizes the differences in the toughness of tea leaves to achieve secondary grading of loose or incomplete leaves. This introduces toughness as a new grading dimension into a single mechanism, overcoming the limitations of traditional equipment that relies solely on geometric dimensions for grading. At the same time, the flexible materials and composite motion significantly reduce mechanical damage to the tea leaves. The gas-solid separation and collection mechanism connects a cyclone separator and an electrostatic precipitator in series with an induced draft fan. The dust-laden airflow first passes through the cyclone separator to separate coarse dust, and then passes through the electrostatic precipitator to capture the charged fine dust. The induced draft fan is placed at the end to create a negative pressure airflow, ensuring directional dust transport and efficient collection.

[0017] In summary, this technical solution fundamentally solves the technical problems of the separation between dust removal and classification, and the single classification dimension, through integrated design and multi-physics field synergy, and achieves the synergistic unity of efficient dust removal and refined classification. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the flexible grading and screening mechanism of the present invention; Figure 3 This is a schematic diagram of the perturbation charge chamber of the present invention; Figure 4 This is a schematic diagram of the method steps of the present invention.

[0019] in: 100. Rack; 200. Disturbance charging chamber; 201. Housing; 202. Pulse airflow generator; 2021. Jet nozzle; 203. Corona charging assembly; 2031. High-voltage electrode; 2032. Grounding plate; 204. Feed inlet; 205. Discharge outlet; 300. Flexible grading and screening mechanism; 301. Sealed cover; 302. Spiral flexible grading screen cylinder; 3021. Grading area; 3022. Screen hole; 303. Servo motor; 304. Feed end; 305. Exhaust port; 306. Discharge end; 307. Spiral guide vane; 400. Gas-solid separation and collection mechanism; 401. Cyclone separator; 402. Electrostatic precipitator; 403. Exhaust fan; 500. Discharge pipe; 600. Receiving hopper; 700. Rotary discharge valve; 800, deflector plate. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Please refer to the following: Figures 1 to 3 This embodiment provides an intelligent integrated device for dust removal, grading, and screening of Pu'er tea, including a frame 100, and a disturbance charging chamber 200, a flexible grading and screening mechanism 300, and a gas-solid separation and collection mechanism 400 arranged sequentially above the frame 100 along the material conveying direction; the three are connected by pipes and a sealing structure to form a closed through airflow channel, so that the tea leaves can complete the dispersion charging, flexible grading, and dust collection in sequence under negative pressure, without the need for intermediate transfer.

[0022] Please see Figure 1The disturbance charging chamber 200 is located at the feed end 304 of the flexible grading and screening mechanism 300. The main body of the disturbance charging chamber 200 is a box 201. The top of the box 201 is provided with a feed inlet 204 for receiving raw tea or tea leaves to be processed. The bottom of the box 201 is provided with a discharge outlet 205, which is connected to the subsequent flexible grading and screening mechanism 300 through an inclined or vertical discharge pipe 500.

[0023] Please see Figure 3 The chamber 201 is equipped with a corona charging component 203 inside and a pulse airflow generator 202 is installed on the outside of the chamber 201. The jet nozzle 2021 of the pulse airflow generator 202 extends into the chamber 201. The pulse airflow generator 202 is used to generate periodic, adjustable pressure pulse airflow, which causes the tea leaves entering the chamber 201 to be fluidized and agitated, thereby removing the micro-dust that is tightly attached to the surface of the tea leaves. The corona charging component 203 is used to charge the removed micro-dust, providing conditions for subsequent electrostatic collection.

[0024] The corona charging assembly 203 includes a high-voltage electrode 2031 and a grounding plate 2032. The high-voltage electrode 2031 is fixed to the top of the housing 201 and extends downward to the middle of the housing 201. For example, it can be a metal barbed wire or a needle-shaped electrode. The grounding plate 2032 is attached to the inner wall of the housing 201. It is usually a metal plate and is grounded together with the housing 201. After the high-voltage electrode 2031 is connected to a DC high-voltage power supply, a corona discharge is generated at its tip, which charges the dust particles in the surrounding air.

[0025] To further enhance the airflow disturbance effect, a guide plate 800 is installed at the jet nozzle 2021 of the pulse airflow generator 202. The guide plate 800 can be arc-shaped or flat and is fixedly installed at the outlet position of the jet nozzle 2021 by a support. Its function is to deflect the airflow direction of the jet nozzle 2021 to an angle of 30 to 90 degrees with the conveying direction of the tea material in the box 201. Within this angle range, the airflow can generate lateral shear force, causing the tea to tumble and rub against each other while moving forward, thereby more fully removing dust and avoiding damage caused by the airflow directly blowing the tea.

[0026] Please refer to the following: Figure 1 and Figure 2The flexible grading and screening mechanism 300 includes a sealed cover 301, a spiral flexible grading screen cylinder 302, and a servo motor 303. The sealed cover 301 is a sealed shell fixedly installed on the frame 100, which houses the spiral flexible grading screen cylinder 302 and forms a negative pressure airflow space. A feed end 304 is provided at one end of the sealed cover 301 near the disturbance charging chamber 200 for connecting to the discharge pipe 500. The feed end 304 of the sealed cover 301 is equipped with a rotary seal, and the end of the discharge pipe 500 is inserted into the rotary seal and connected to the spiral flexible grading screen cylinder 302. The inner cavity of the spiral flexible grading screen cylinder 302 is connected; the rotating seal can adopt a labyrinth seal, felt seal or lip seal ring structure, wherein the inner ring of the rotating seal rotates relative to the outer wall of the end of the spiral flexible grading screen cylinder 302, and the outer ring of the rotating seal is fixed to the sealing cover 301, which allows the spiral flexible grading screen cylinder 302 to rotate freely and prevents dust from leaking out; an exhaust port 305 is provided above the end of the sealing cover 301 near the gas-solid separation and collection mechanism 400, which is used to guide the dust-laden airflow to the subsequent gas-solid separation and collection mechanism 400.

[0027] Please see Figure 2 The spiral flexible grading sieve cylinder 302 is made of flexible silicone or flexible polyurethane material, and is cylindrical in shape. It is horizontally or inclinedly installed inside the sealed cover 301. The inner wall of the spiral flexible grading sieve cylinder 302 is provided with spiral guide blades 307. The spiral guide blades 307 are integrally formed with the spiral flexible grading sieve cylinder 302 or fixed by bonding or fitting. The pitch of the spiral guide blades 307 can be adjusted according to the type of tea and the processing volume. A large number of sieve holes 3022 are opened on the cylinder wall of the spiral flexible grading sieve cylinder 302 for tea leaves or broken pieces below the set size to pass through.

[0028] As a further improvement, the spiral flexible grading sieve cylinder 302 is divided into multiple grading zones 3021 along the axial direction, and each grading zone 3021 is provided with sieve holes 3022 of different diameters. For example, from the feed inlet to the discharge end 306 of the spiral flexible grading sieve cylinder 302, the sieve holes 3022 in the front section of the spiral flexible grading sieve cylinder 302 have a small diameter of 1 to 3 mm, which is used to separate fragments and fine sand; the sieve holes 3022 in the rear section of the spiral flexible grading sieve cylinder 302 have a large diameter of 5 to 8 mm, which is used to separate loose leaves and secondary tea raw materials; and the discharge end 306 at the end of the spiral flexible grading sieve cylinder 302 is used to separate qualified tea raw materials. Through this partitioned design, multi-level sorting can be achieved in the length direction of the spiral flexible grading sieve cylinder 302, so that tea of ​​different qualities can be discharged from different grading zones 3021 and the discharge end 306 on the spiral flexible grading sieve cylinder 302.

[0029] Please see Figure 2The servo motor 303 is mounted on the frame 100. The servo motor 303 is connected to the outer wall or end gear ring of the spiral flexible grading screen cylinder 302 through gear transmission, friction wheel transmission or synchronous belt transmission. The servo motor 303 can not only accurately control the rotation speed of the screen cylinder, but also output a composite motion of low-frequency rotation and high-frequency micro-torsion according to the preset program.

[0030] Specifically, the servo motor 303 drives the sieve cylinder to rotate at a low speed of 5-30 rpm, while the superimposed torsional vibration is a high-frequency micro-torsion with a frequency of 10-80 Hz and a torsion angle of 0.5-2. The low-speed rotation causes the tea leaves to slowly roll forward along the axis of the spiral flexible grading sieve cylinder 302 under the push of the spiral guide blades 307, achieving preliminary grading based on quality and geometric dimensions. The high-frequency micro-torsion causes the spiral flexible grading sieve cylinder 302 to generate rapid forward and reverse torsion at small angles. At this time, tea leaves with intact structure and good toughness can move synchronously with the spiral flexible grading sieve cylinder 302, while loose, incomplete, or tough leaves cannot respond synchronously due to their large structural damping and are thus shaken out of the sieve holes 3022, achieving secondary grading based on toughness and integrity.

[0031] To collect tea leaves leaking from different grading zones 3021, a receiving hopper 600 is provided at the bottom of the sealing cover 301 along the axial direction of the spiral flexible grading screen cylinder 302, corresponding to each grading zone 3021. A rotary discharge valve 700 is installed at the outlet of each receiving hopper 600. The rotary discharge valve 700 is also called a star-shaped discharge valve or airlock. During the low-speed rotation of the rotary discharge valve 700, the tea leaves fall from the top into the impeller grid chamber and are carried to the bottom for discharge. At the same time, at least one blade always blocks the airflow channel, thereby preventing external air from being sucked back into the sealing cover 301 from the receiving hopper 600, thus maintaining the negative pressure state inside the sealing cover 301.

[0032] Please see Figure 1 The gas-solid separation and collection mechanism 400 includes a cyclone separator 401, an electrostatic precipitator 402, and an induced draft fan 403. The inlet of the cyclone separator 401 is connected to the exhaust port 305 above the sealed cover 301 via an inlet pipe, and the outlet of the cyclone separator 401 is connected to the inlet of the electrostatic precipitator 402 via an exhaust pipe. To enhance the separation effect, two or three stages of cyclone separators 401 can be connected in series. The first stage separates coarser particles, the second stage separates medium-sized particles, and finally the particles enter the electrostatic precipitator 402. Each stage of the cyclone separator 401 has a dust discharge valve at its bottom for periodically discharging the collected coarse dust.

[0033] The electrostatic precipitator 402 preferably adopts a plate structure, with multiple sets of dust collection electrodes and discharge electrodes arranged in parallel intervals inside. The discharge electrodes are connected to the negative terminal of a high-voltage DC power supply, and the dust collection electrodes are connected to the positive terminal or grounded. After the charged fine dust from the disturbance charging chamber 200 enters the electrostatic precipitator 402 with the airflow, it is adsorbed onto the surface of the dust collection electrodes under the action of a high-voltage electric field. After periodic shaking or cleaning, it is discharged. The exhaust port of the electrostatic precipitator 402 is connected to the air inlet of the induced draft fan 403 through a pipe. The induced draft fan 403 is placed at the end of the entire air path. Its impeller rotation generates negative pressure, causing the airflow to pass from the disturbance charging chamber 200 through the sealed cover 301, the cyclone separator 401, and the electrostatic precipitator 402 in sequence, and finally discharged into the atmosphere. By arranging the induced draft fan 403 at the end, the entire system can be kept in a negative pressure state to prevent dust leakage and environmental pollution.

[0034] Based on the aforementioned intelligent integrated equipment for dust removal, grading, and screening of Pu'er tea, this invention also provides a method for dust removal, grading, and screening, specifically including the following steps: S10: The raw tea leaves to be processed are sent into the disturbance charging chamber 200, the pulse airflow generator 202 is started to disperse the tea leaves, and at the same time the corona charging component 203 is started to charge the dust that has separated from the tea leaves.

[0035] In this step, the raw tea leaves fall into the housing 201 through the feed inlet 204. The pulse airflow generator 202 sprays pulse airflow into the housing 201 at a certain frequency and pressure, causing the tea leaves to turn and disperse. Preferably, the airflow pressure of the pulse airflow generator 202 is 0.2 to 0.8 MPa and the pulse frequency is 5 to 15 Hz. The discharge voltage of the corona charging component 203 is 5 to 25 kV. Within this parameter range, the tea leaves can form a slight boiling state, the dust is fully stripped off and carries a negative charge, while the tea leaves themselves are not damaged.

[0036] S20: The tea leaves processed in S10 are fed into the spiral flexible grading screen cylinder 302. The servo motor 303 drives the screen cylinder to move in a low-speed rotation superimposed with high-frequency micro-torsion, so that the tea leaves are discharged from the discharge end 306 and the screen hole 3022 of the spiral flexible grading screen cylinder 302 based on the differences in geometric size and toughness.

[0037] Tea leaves enter the inner cavity of the spiral flexible grading sieve cylinder 302 under the influence of gravity and negative pressure airflow. The servo motor 303 initially operates at a low speed of 5-30 rpm, causing the tea leaves to slowly tumble and advance along the spiral guide blades 307 towards the discharge end 306 of the spiral flexible grading sieve cylinder 302. During this process, high-frequency micro-torsion with a frequency of 10-80 Hz and a torsion angle of 0.5-2 can be intermittently or continuously superimposed, depending on the tea variety and moisture content. Tight and intact high-quality tea leaves, due to their high toughness and low damping, can maintain stable movement and are eventually discharged from the discharge end 306 of the spiral flexible grading sieve cylinder 302. Loose, incomplete, or flat tea leaves, under torsional vibration, leak out from the sieve holes 3022 of the corresponding grading area 3021 and fall into the corresponding receiving hopper 600. By adjusting the amplitude and frequency of the torsional vibration, tea raw materials with different moisture contents or different grades can be adapted.

[0038] S30: Start the induced draft fan 403 so that the airflow carrying charged dust passes through the cyclone separator 401 and the electrostatic precipitator 402 in sequence to separate coarse dust and collect fine dust respectively.

[0039] After the induced draft fan 403 starts, a negative pressure is formed inside the sealed cover 301. Air is drawn in from the sieve holes 3022 of the spiral flexible grading sieve cylinder 302 and the feed end 304 of the sealed cover, carrying charged dust that has been detached from the tea leaves. The airflow first enters the cyclone separator 401. Under the action of centrifugal force, the heavier coarse dust (particle size > 50 μm) is thrown against the cylinder wall and falls to the dust discharge valve for discharge. Then the airflow enters the electrostatic precipitator 402. The fine dust is adsorbed to the dust collection electrode in the high voltage electric field. After regular cleaning, it is treated as waste. The purified air is discharged into the atmosphere by the induced draft fan 403.

[0040] S40: Collects high-quality tea leaves discharged from the discharge end 306 of the spiral flexible grading screen cylinder 302 and substandard tea leaves discharged from each receiving hopper 600.

[0041] The tea leaves discharged from the sieve cylinder outlet 306 are compact and intact high-quality raw materials, which can be directly used for subsequent pressing or refining; the secondary tea leaves and broken pieces discharged from different receiving hoppers 600 can be processed separately as needed or used as low-grade raw materials.

[0042] In addition to the above embodiments, the present invention may also employ the following equivalent or alternative solutions, all of which fall within the protection scope of the present invention: The material of the spiral flexible grading screen cylinder 302 is not limited to silicone and polyurethane. Other food-grade elastomers or flexible woven meshes, such as fluororubber and natural rubber coated fabrics, can also be used, as long as they have sufficient elasticity and wear resistance.

[0043] Electrostatic precipitator 402 can also adopt a tubular or honeycomb structure, which bundles multiple round or hexagonal tubes together, with a corona electrode suspended in the center of each tube. It is suitable for handling occasions with small air volume and limited installation space.

[0044] The angle of the deflector plate is not limited to 30-90 degrees. It can also be adjusted to other non-zero angles depending on the tea variety and processing volume, as long as it achieves lateral airflow disturbance.

[0045] In addition to low-speed rotation + high-frequency torsion, the composite motion mode of the servo motor 303 can also use intermittent torsion or variable frequency torsion alone to adapt to tea leaves with different moisture content and compactness.

[0046] The rotary discharge valve 700 can be replaced by a double-layer flap valve or a material sealing pipe, but the rotary discharge valve 700 is preferred because it has the best continuous discharge and airlock effect.

[0047] This invention integrates disturbance charging, flexible grading, and gas-solid separation into one unit. It utilizes the synergy of pulsed airflow and corona charging to achieve dust stripping and marking, and uses the low-speed rotation and high-frequency torsion of the flexible screen cylinder to achieve dual grading based on geometric dimensions and toughness. Furthermore, it utilizes the series connection of cyclone separation and electrostatic capture to achieve efficient dust removal. This invention completely solves the problems of the separation between dust removal and grading and the single grading dimension in the prior art. It has outstanding advantages such as compact equipment, minimal tea damage, high grading quality, and good dust removal efficiency.

[0048] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A kind of intelligent integrated equipment of Pu'er tea dedusting classification screening, including rack (100), it is characterized in that, The frame (100) is provided with a disturbance charging chamber (200), a flexible grading and screening mechanism (300) and a gas-solid separation and collection mechanism (400) in sequence above it; The flexible grading and screening mechanism (300) includes a sealing cover (301), a spiral flexible grading screen cylinder (302), and a servo motor (303). The spiral flexible grading screen cylinder (302) is horizontally or inclinedly disposed inside the sealing cover (301). The servo motor (303) is connected to the spiral flexible grading screen cylinder (302) in a driving connection. The sealing cover (301) has a feed end (304) at one end near the disturbance charging chamber (200), an exhaust port (305) at the top of the sealing cover (301) near the gas-solid separation and collection mechanism (400), and a discharge end (306) at the end of the spiral flexible grading screen cylinder (302) away from the disturbance charging chamber (200). The disturbance charging chamber (200) includes a housing (201), a pulse airflow generator (202), and a corona charging assembly (203). The corona charging assembly (203) is located inside the housing (201), and the pulse airflow generator (202) is located outside the housing (201), with its jet nozzle (2021) extending into the housing (201). The top of the housing (201) has a feed inlet (204), and the bottom of the housing (201) has a discharge outlet (205). The discharge outlet (205) is connected to the feed inlet (304) at the end of the sealing cover (301) through a discharge pipe (500). The gas-solid separation and collection mechanism (400) includes a cyclone separator (401), an electrostatic precipitator (402), and an induced draft fan (403). The air inlet of the cyclone separator (401) is connected to the exhaust port (305) above the sealed cover (301) through an air inlet pipe. The air outlet of the cyclone separator (401) is connected to the air inlet of the electrostatic precipitator (402) through an exhaust pipe. The exhaust port of the electrostatic precipitator (402) is connected to the induced draft fan (403).

2. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 1, characterized in that, The spiral flexible grading screen cylinder (302) is made of flexible silicone material or flexible polyurethane material, and the inner wall of the spiral flexible grading screen cylinder (302) is provided with spiral guide vanes (307).

3. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 1, characterized in that, The servo motor (303) drives the spiral flexible grading screen cylinder (302) to generate a composite motion of rotation and torsional vibration. The rotation is a low-speed rotation of 5 to 30 rpm, and the torsional vibration is a high-frequency micro-amplitude torsion with a frequency of 10 to 80 Hz and a torsion angle of 0.5 to 2.

4. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 2, characterized in that, The spiral flexible grading sieve cylinder (302) is divided into multiple grading regions (3021) along the axial direction, and each grading region (3021) is provided with sieve holes (3022) of different aperture sizes.

5. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 4, characterized in that, The bottom of the sealing cover (301) is provided with a receiving hopper (600) along the axial direction corresponding to each of the grading areas (3021), and a rotary discharge valve (700) is installed at the outlet of each receiving hopper (600).

6. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 1, characterized in that, The feed end (304) of the sealing cover (301) is provided with a rotary seal, and the end of the discharge pipe (500) is inserted into the rotary seal and communicates with the spiral flexible grading screen cylinder (302).

7. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 1, characterized in that, The corona charging assembly (203) includes a high-voltage electrode (2031) and a grounding plate (2032). The high-voltage electrode (2031) is fixed to the top of the housing (201) and extends downward to the middle of the housing (201). The grounding plate (2032) is located on the inner wall of the housing (201).

8. The intelligent integrated device for dust removal and grading screening of Pu'er tea according to claim 1, characterized in that, A guide plate (800) is installed at the jet nozzle (2021) of the pulse airflow generator (202), and the guide plate (800) deflects the airflow direction of the jet nozzle (2021) to an angle of 30 to 90 degrees with the tea material conveying direction.

9. A dust classification screening method based on the intelligent integrated equipment for dust classification screening of Pu'er tea according to any one of claims 1 to 8, characterized in that, Includes the following steps: S10: The raw tea leaves to be processed are sent into the disturbance charging chamber (200), the pulse airflow generator (202) is started to disperse the tea leaves, and the corona charging component (203) is started to charge the dust that has separated from the tea leaves. S20: The tea leaves processed by S10 are fed into the spiral flexible grading screen cylinder (302). The servo motor (303) drives the screen cylinder to move in a low-speed rotation superimposed with high-frequency micro-torsion, so that the tea leaves are discharged from the discharge end (306) and the screen hole (3022) of the spiral flexible grading screen cylinder (302) respectively based on the differences in geometric size and toughness. S30: Start the induced draft fan (403) so that the airflow carrying charged dust passes through the cyclone separator (401) and the electrostatic precipitator (402) in sequence to separate coarse dust and collect fine dust respectively; S40: Collect tea leaves discharged from the discharge end (306) of the spiral flexible grading screen cylinder (302) and tea leaves discharged from each grading zone (3021).

10. The method according to claim 9, wherein the method is characterized by, In step S10, the airflow pressure of the pulse airflow generator (202) is 0.2-0.8 MPa, the pulse frequency is 5-15 Hz, and the discharge voltage of the corona charging component (203) is 5-25 kV.

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