Automatic grading and sorting equipment applied to tea processing and use method thereof

Abstract

This invention relates to the field of tea sieving technology, specifically disclosing an automatic grading and sorting device for tea processing and its usage method. The grading and sorting device includes: a frame; a sieving unit; a shaking unit; a flexible sweeping unit; and an inertial vibration unit. The rotating sweeping component in the flexible sweeping unit rotates during lateral feeding, thereby achieving flexible sweeping to remove tea hairs from the mesh. The inertial vibration unit utilizes the inertia of the sieving frame during shaking to generate periodic high-frequency oscillations through a piston-spring mechanism, directly acting on the screen to effectively break up tea leaf adhesion and bridging, thus promoting tea leaf stratification and sieve penetration. During the vibration process, the inertial vibration unit is linked with the flexible sweeping unit's air circuit, supplying the generated compressed air to the flexible sweeping unit through an air pipe, thereby generating periodic pulsed airflow to instantly blow clean the cleaning area, ensuring continuous unobstructed flow through the screen.

Description

Technical Field

[0001] This invention relates to the field of tea sieving technology, and more specifically, to an automatic grading and sorting device for tea processing and its usage method. Background Technology

[0002] In the tea processing industry, automatic screening is a key process for grading and selecting raw materials; however, when existing screening equipment is used for tea, especially varieties rich in tea hairs (such as white tea and black tea), the screen mesh is easily attached and clogged by fine and light tea hairs. Traditional vibrating screens or flat shaking screens mainly rely on the collision and friction between particles to achieve sieving. However, they are not very effective for tea hairs that are easy to stick together. Tea hairs will gradually accumulate at the screen holes, forming soft blockages, which greatly reduces the effective sieving area and sieving rate, causing the sieving efficiency to decline rapidly over time and affecting the grading accuracy. Summary of the Invention

[0003] To overcome the above-mentioned technical problems, this invention proposes an automatic grading and sorting device for tea processing and its usage method.

[0004] The objective of this invention can be achieved through the following technical solutions: An automatic grading and sorting device for tea processing includes: frame; A screening unit, which is movably mounted on a frame, includes a screening frame, in which an upper screen and a lower screen are arranged sequentially from top to bottom, and the mesh size of the upper screen is larger than that of the lower screen. The shaking unit, which is mounted on the frame, is used to drive the screening frame to shake back and forth. A flexible cleaning unit is installed inside a screening frame and located below the lower screen. It includes a rotating cleaning component that is movably installed inside the screening frame and racks fixed on the inner walls of both sides of the screening frame. The rotating cleaning component has gears that mesh with the corresponding racks at both ends. The outer side of the screening frame has a feed component for driving the rotating cleaning component. An inertial vibration unit is installed inside the screening frame. When the screening frame shakes back and forth, the inertial vibration unit periodically vibrates the inside of the screening frame under the action of inertia.

[0005] As a further embodiment of the present invention: a first discharge trough connected to the upper surface of the upper screen and a second discharge trough connected to the upper surface of the lower screen are respectively provided on one side of the screening frame, and a third discharge trough located below the lower screen is provided at the bottom of the screening frame.

[0006] As a further aspect of the present invention: the shaking unit includes a drive shaft rotatably mounted on one side of the frame and a drive motor fixedly mounted on the bottom of the frame. One end of the drive shaft is coaxially fixed with a drive wheel. A transmission belt connects the output shaft of the drive motor and the drive wheel. A rocking component connects the drive shaft and the screening frame. Rocking rods that are hinged to the frame are provided around the screening frame.

[0007] As a further aspect of the present invention: the rocking component includes a connecting rod hinged to one side of the screening frame and a cam disk fixedly sleeved on the drive shaft. The cam disk has a cam groove, and the end of the connecting rod away from the screening frame is provided with a sliding pin that is slidably embedded in the cam groove.

[0008] As a further aspect of the present invention: the rotating cleaning component includes a rotating shaft, a plurality of flexible cleaning blades are arranged circumferentially on the rotating shaft, and the gear is coaxially fixed at both ends of the rotating shaft.

[0009] As a further embodiment of the present invention: the feeding component includes guide rods that are laterally fixed to the outer walls of both sides of the screening frame, a sliding seat is slidably sleeved on the guide rod, a reciprocating motor is fixedly installed on the sliding seat, the output end of the reciprocating motor is coaxially fixedly connected to the rotating cleaning component, and the screening frame is symmetrically provided with strip-shaped through grooves to avoid the rotating cleaning component on both sides.

[0010] As a further aspect of the present invention: the inertial vibration unit includes a mounting frame fixed inside the screening frame, a sleeve is provided on the mounting frame, a piston rod is slidably installed inside the sleeve, a vibration disc is provided at the protruding end of the piston rod, and a spring is provided between the vibration disc and the sleeve, the spring being movably sleeved on the piston rod.

[0011] As a further aspect of the present invention: the sliding seat is provided with an air supply sleeve for supplying air to the rotating cleaning component, an air pipe is connected between the sleeve and the air supply sleeve, and the top of the sleeve is respectively provided with a first one-way valve connected to the air pipe and a second one-way valve connected to the inside of the screening frame.

[0012] As a further aspect of the present invention: the air supply sleeve includes a sleeve body fixed on a sliding seat, the rotating shaft is rotatably sleeved in the sleeve body, an air cavity is opened in the sleeve body, and an air nozzle connected to an air pipe is provided on one side of the air cavity; an air passage is axially opened in the rotating shaft, and a plurality of through holes communicating with the interior of the air cavity are circumferentially opened at one end of the air passage located in the air cavity, and a plurality of air blowing grooves communicating with the air passage are circumferentially opened on the rotating shaft.

[0013] This invention also discloses a method for using an automatic grading and sorting device applied to tea processing, comprising the following steps: Step 1: Pour the tea leaves into the upper screen of the sieving rack. The shaking unit drives the entire sieving rack to swing back and forth, using the upper and lower screens to screen the different sizes and structures of the tea leaves. Step 2: The feeder drives the rotating cleaning component to feed laterally along the rack. At the same time, under the meshing action of the gear and rack, the rotating cleaning component itself also rotates continuously in the circumferential direction to gently sweep and clean the tea hairs attached to the mesh holes along the lower screen surface. Step 3: During the reciprocating shaking of the screening frame, the inertial vibration unit periodically impacts the screening frame under the action of inertia, transmitting the vibration to the upper and lower screens, promoting the stratification and screening of tea leaves.

[0014] The beneficial effects of this invention are: The rotating cleaning component in the flexible cleaning unit rotates during the transverse feed, thereby achieving flexible sweeping to remove tea hairs from the mesh; the inertial vibration unit utilizes the inertia of the sieving frame when it shakes to generate periodic high-frequency oscillations through a piston-spring mechanism, which directly acts on the screen to effectively break up the tea leaves that stick together and bridge, thereby promoting the stratification and screening of the tea leaves. During the vibration process, the inertial vibration unit works in conjunction with the air circuit of the flexible cleaning unit to supply the generated compressed air to the flexible cleaning unit through the air pipe, thereby generating periodic pulse airflow to blow the cleaning area in real time and ensure that the screen remains unobstructed. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional schematic diagram of an automatic grading and sorting device for tea processing according to the present invention; Figure 2 This is a three-dimensional schematic diagram from another perspective of an automatic grading and sorting device for tea processing according to the present invention; Figure 3 This is a schematic diagram of the screening unit in an automatic grading and sorting device for tea processing according to the present invention; Figure 4 This is a schematic diagram of the internal structure of the screening rack in an automatic grading and sorting device for tea processing according to the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view at point B in the middle; Figure 7 This is a schematic diagram of the external structure of the screening rack in an automatic grading and sorting device for tea processing according to the present invention; Figure 8 for Figure 7 Enlarged view at point C; Figure 9 This is a schematic diagram of the air supply component in an automatic grading and sorting device for tea processing according to the present invention. Figure 10 This is a schematic diagram of the screening frame and shaking unit in an automatic grading and sorting device for tea processing according to the present invention; Figure 11 for Figure 10 Enlarged view of point D in the middle.

[0017] In the picture: 100. Rack; 200. Screening unit; 210. Screening frame; 211. Strip trough; 220. Upper screen; 230. Lower screen; 240. First discharge chute; 250. Second discharge chute; 260. Third discharge chute; 270. Swing rod; 300, rocking unit; 310, drive shaft; 320, drive motor; 330, drive wheel; 340, transmission belt; 350, rocker component; 351, connecting rod; 352, cam disc; 353, cam groove; 354, sliding pin; 400 Flexible cleaning unit; 410 Rotary cleaning component; 411 Rotating shaft; 412 Flexible cleaning blade; 413 Air blowing channel; 414 Air passage; 415 Through hole; 420 Rack; 430 Gear; 440 Guide rod; 450 Sliding seat; 460 Reciprocating motor; 470 Air supply sleeve; 471 Sleeve body; 472 Air chamber; 473 Air nozzle; 500, Inertial vibration unit; 510, Mounting bracket; 520, Sleeve; 530, Piston rod; 540, Vibrating disc; 550, Spring; 560, Air pipe; 570, First check valve; 580, Second check valve. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] Please see Figure 1 and Figure 2 The present invention discloses an automatic grading and sorting equipment for tea processing, including a frame 100, a screening unit 200, a shaking unit 300, a flexible cleaning unit 400 and an inertial vibration unit 500. Please see Figure 3The screening unit 200 is movably mounted on the frame 100 and includes a screening frame 210. An upper screen 220 and a lower screen 230 are arranged sequentially from top to bottom inside the screening frame 210. The mesh size of the upper screen 220 is larger than that of the lower screen 230. The shaking unit 300 is mounted on the frame 100 and is used to drive the screening frame 210 to shake back and forth. Please see Figure 4 and Figure 5 The flexible cleaning unit 400 is disposed inside the screening frame 210 and located below the lower screen 230. It includes a rotating cleaning component 410 movably disposed inside the screening frame 210 and racks 420 fixed on the inner walls of both sides of the screening frame 210. The rotating cleaning component 410 has gears 430 symmetrically disposed at both ends that mesh with the corresponding racks 420. The outer side of the screening frame 210 is provided with a feed component for driving the rotating cleaning component 410. The inertial vibration unit 500 is disposed inside the screening frame 210. When the screening frame 210 reciprocates, the inertial vibration unit 500 periodically vibrates the inside of the screening frame 210 under the action of inertia. Specifically, tea leaves are poured onto the upper screen 220 within the sieving frame 210. The shaking unit 300 drives the entire sieving frame 210 to oscillate back and forth, using the upper screen 220 and lower screen 230 to sift tea leaves of different sizes and structures. During the sieving process, the feeder drives the rotating cleaning component 410 to feed laterally along the rack 420. Simultaneously, under the meshing action of the gear 430 and the rack 420, the rotating cleaning component 410 itself also rotates continuously in a circumferential direction, thereby gently sweeping and cleaning the tea hairs attached to the mesh openings along the lower screen 230, preventing the continuous accumulation of tea hairs from clogging the mesh and affecting the sieving of tea leaves. During the reciprocating sieving of the sieving frame 210, the inertial vibration unit 500 periodically impacts the sieving frame 210 under inertial action, thereby transmitting the vibration to the upper screen 220 and lower screen 230, promoting the stratified sieving of tea leaves.

[0020] In one embodiment, please refer to Figure 3 The screening frame 210 is provided with a first discharge chute 240 connected to the upper end of the upper screen 220 and a second discharge chute 250 connected to the upper end of the lower screen 230 on one side. The screening frame 210 is provided with a third discharge chute 260 located below the screen of the lower screen 230 at the bottom. Specifically, the tea leaves are poured onto the upper screen 220. After being shaken and sieved, the large tea leaves that remain on the upper surface of the upper screen 220 are discharged from the first discharge chute 240 on one side. The medium-sized tea leaves that pass through the mesh of the upper screen 220 and remain on the upper surface of the lower screen 230 are discharged from the second discharge chute 250 on one side. The small tea leaves pass through the mesh of the lower screen 230 and fall into the bottom of the sieving frame 210 and are discharged through the third discharge chute 260.

[0021] Further, please refer to Figure 1 and Figure 2 The shaking unit 300 includes a drive shaft 310 rotatably mounted on one side of the frame 100 and a drive motor 320 fixedly mounted on the bottom of the frame 100. One end of the drive shaft 310 is coaxially fixed with a drive wheel 330. A transmission belt 340 is connected between the output shaft of the drive motor 320 and the drive wheel 330. A rocking member 350 is connected between the drive shaft 310 and the screening frame 210. Rocking rods 270 hinged to the frame 100 are provided around the screening frame 210. Accordingly, please refer to Figure 10 and Figure 11 The swinging component 350 includes a connecting rod 351 hinged to one side of the screening frame 210 and a cam disk 352 fixedly sleeved on the drive shaft 310. The cam disk 352 is provided with a cam groove 353, and the end of the connecting rod 351 away from the screening frame 210 is provided with a sliding pin 354 that is slidably embedded in the cam groove 353. Specifically, under the transmission of the transmission belt 340 and the drive wheel 330, the drive motor 320 drives the drive shaft 310 to rotate continuously, thereby driving the cam disk 352 to rotate synchronously. The sliding pin 354 moves adaptively in the cam groove 353 of the cam disk 352, thereby driving the connecting rod 351 to swing back and forth, thereby driving the entire screening frame 210 and the swing rod 270 to swing back and forth in the vertical plane relative to the frame 100.

[0022] In yet another embodiment, please refer to Figure 4 and Figure 5 The rotating cleaning component 410 includes a rotating shaft 411, on which a plurality of flexible cleaning blades 412 are arranged circumferentially, and the gear 430 is coaxially fixed to both ends of the rotating shaft 411. Specifically, when the rotating shaft 411 feeds laterally along the extension direction of the rack 420 (i.e., the extension direction of the mesh surface of the lower screen 230), the rotating shaft 411 itself also rotates circumferentially, thereby driving each flexible cleaning blade 412 to perform flexible sweeping of the mesh of the lower screen 230 along the way, so as to remove the tea hairs attached to the mesh and avoid damaging the tea leaves.

[0023] Further, please refer to Figure 7 and Figure 8 The feeding component includes guide rods 440 that are laterally fixed to the outer walls of both sides of the screening frame 210. A sliding seat 450 is slidably sleeved on the guide rods 440. A reciprocating motor 460 is fixedly installed on the sliding seat 450. The output end of the reciprocating motor 460 is coaxially fixedly connected to the rotating cleaning component 410. The screening frame 210 has symmetrically opened strip-shaped through slots 211 on both sides to avoid the rotating cleaning component 410. Specifically, the reciprocating motor 460 drives the rotating shaft 411 to rotate. Under the meshing transmission of the gear 430 and the rack 420, the sliding seat 450 can be driven to slide laterally along the guide rod 440, thereby realizing the overall lateral feeding of the rotating cleaning component 410 and its own circumferential rotation cleaning. When the rotating cleaning component 410 reaches one end of the lower screen 230, the reciprocating motor 460 switches the direction, thereby driving the rotating cleaning component 410 to perform reciprocating flexible cleaning of the lower screen 230.

[0024] In further embodiments, please refer to Figure 4 and Figure 6 The inertial vibration unit 500 includes a mounting frame 510 fixed inside the screening frame 210. A sleeve 520 is provided on the mounting frame 510. A piston rod 530 is slidably installed inside the sleeve 520. A vibration disc 540 is provided at the extended end of the piston rod 530. A spring 550 is provided between the vibration disc 540 and the sleeve 520. The spring 550 is movably sleeved on the piston rod 530. Specifically, when the screening frame 210 swings back and forth up and down and left and right, the piston rod 530 extends and retracts adaptively within the sleeve 520. Combined with the elastic force of the spring 550, this causes the vibrating disc 540 to periodically impact the screening frame 210. The vibration effect generated by the impact is transmitted to the upper screen 220 and the lower screen 230 to improve the screening effect.

[0025] Further, please refer to Figure 6 and Figure 8 The sliding seat 450 is provided with an air supply sleeve 470 for supplying air to the rotating cleaning component 410. An air pipe 560 is connected between the sleeve 520 and the air supply sleeve 470. The top of the sleeve 520 is provided with a first one-way valve 570 connected to the air pipe 560 and a second one-way valve 580 connected to the inside of the screening frame 210. Specifically, when the piston rod 530 extends out of the sleeve 520, the second one-way valve 580 opens and the first one-way valve 570 closes, thereby drawing air from inside the screening frame 210 into the sleeve 520; subsequently, when the piston rod 530 retracts into the sleeve 520, the second one-way valve 580 closes and the first one-way valve 570 opens, thereby squeezing the air in the sleeve 520 through the air pipe 560 into the air supply sleeve 470, thereby periodically supplying air to the rotating cleaning component 410, and further using the airflow to blow and clean the tea hairs swept along the way.

[0026] Furthermore, please refer to Figure 8 and Figure 9The air supply sleeve 470 includes a sleeve body 471 fixed on a sliding seat 450. The rotating shaft 411 is rotatably sleeved inside the sleeve body 471. An air chamber 472 is opened inside the sleeve body 471. An air nozzle 473 connected to an air pipe 560 is provided on one side of the air chamber 472. An air passage 414 is axially opened inside the rotating shaft 411. One end of the air passage 414 located inside the air chamber 472 has several through holes 415 circumferentially opened, communicating with the inside of the air chamber 472. A number of air blowing grooves 413 communicating with the air passage 414 are circumferentially opened on the rotating shaft 411. Specifically, air enters the air chamber 472 through the air tube 560 and the air nozzle 473, and then continues to enter the air passage 414 through each through hole 415, and finally is ejected from each air blowing groove 413 to achieve airflow sweeping of the mesh along the way.

[0027] This invention also provides a method for using an automatic grading and sorting device for tea processing, comprising the following steps: Step 1: Pour the tea leaves onto the upper screen 220 inside the sieving rack 210. Drive the entire sieving rack 210 to swing back and forth through the shaking unit 300. Use the upper screen 220 and the lower screen 230 to screen the different sizes and structures of the tea leaves. Step 2: The feeder drives the rotating cleaning component 410 to feed laterally along the rack 420. At the same time, under the meshing action of the gear 430 and the rack 420, the rotating cleaning component 410 itself also rotates continuously in the circumferential direction to gently sweep and clean the tea hairs attached to the mesh holes along the lower screen 230. Step 3: During the reciprocating shaking of the screening frame 210, the inertial vibration unit 500 periodically impacts the screening frame 210 under the action of inertia, transmitting the vibration to the upper screen 220 and the lower screen 230, promoting the stratification and screening of tea leaves.

[0028] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. An automatic grading and sorting device for tea processing, characterized in that, include: Rack (100); The screening unit (200) is movably mounted on the frame (100) and includes a screening frame (210). The screening frame (210) has an upper screen (220) and a lower screen (230) arranged from top to bottom. The mesh size of the upper screen (220) is larger than that of the lower screen (230). A shaking unit (300) is mounted on the frame (100) and is used to drive the screening frame (210) to reciprocate. A flexible cleaning unit (400) is disposed inside the screening frame (210) and located below the lower screen (230). It includes a rotating cleaning component (410) movably disposed inside the screening frame (210) and racks (420) fixed on the inner walls of both sides of the screening frame (210). The rotating cleaning component (410) has gears (430) symmetrically arranged at both ends that mesh with the corresponding racks (420). The screening frame (210) has a feeder for driving the rotating cleaning component (410) on its outer side. An inertial vibration unit (500) is installed inside the screening frame (210). When the screening frame (210) shakes back and forth, the inertial vibration unit (500) periodically vibrates the inside of the screening frame (210) under the action of inertia.

2. The automatic grading and sorting equipment for tea processing according to claim 1, characterized in that, The screening frame (210) is provided with a first discharge chute (240) connected to the upper end of the upper screen (220) and a second discharge chute (250) connected to the upper end of the lower screen (230) on one side. The screening frame (210) is provided with a third discharge chute (260) located below the lower screen (230) at the bottom.

3. The automatic grading and sorting equipment for tea processing according to claim 1, characterized in that, The shaking unit (300) includes a drive shaft (310) rotatably mounted on one side of the frame (100) and a drive motor (320) fixedly mounted on the bottom of the frame (100). One end of the drive shaft (310) is coaxially fixed with a drive wheel (330). A transmission belt (340) is connected between the output shaft of the drive motor (320) and the drive wheel (330). A rocking member (350) is connected between the drive shaft (310) and the screening frame (210). Rocking rods (270) are hinged to the frame (100) around the screening frame (210).

4. An automatic grading and sorting device for tea processing according to claim 3, characterized in that, The rocker component (350) includes a connecting rod (351) hinged to one side of the screening frame (210) and a cam disk (352) fixedly sleeved on the drive shaft (310). The cam disk (352) is provided with a cam groove (353), and a sliding pin (354) is provided at the end of the connecting rod (351) away from the screening frame (210) and slidably embedded in the cam groove (353).

5. An automatic grading and sorting device for tea processing according to claim 1, characterized in that, The rotating cleaning component (410) includes a rotating shaft (411), on which a plurality of flexible cleaning blades (412) are arranged circumferentially, and the gear (430) is coaxially fixed at both ends of the rotating shaft (411).

6. An automatic grading and sorting device for tea processing according to claim 5, characterized in that, The feeding component includes guide rods (440) that are laterally fixed to the outer walls of both sides of the screening frame (210). A sliding seat (450) is slidably sleeved on the guide rods (440). A reciprocating motor (460) is fixedly installed on the sliding seat (450). The output end of the reciprocating motor (460) is coaxially fixedly connected to the rotating cleaning component (410). The screening frame (210) has symmetrically opened strip-shaped through slots (211) on both sides to avoid the rotating cleaning component (410).

7. An automatic grading and sorting device for tea processing according to claim 6, characterized in that, The inertial vibration unit (500) includes a mounting frame (510) fixed inside the screening frame (210). A sleeve (520) is provided on the mounting frame (510). A piston rod (530) is slidably installed inside the sleeve (520). A vibration disc (540) is provided at the extended end of the piston rod (530). A spring (550) is provided between the vibration disc (540) and the sleeve (520). The spring (550) is movably sleeved on the piston rod (530).

8. An automatic grading and sorting device for tea processing according to claim 7, characterized in that, The sliding seat (450) is provided with an air supply sleeve (470) for supplying air to the rotating cleaning component (410). An air pipe (560) is connected between the sleeve (520) and the air supply sleeve (470). The top of the sleeve (520) is provided with a first one-way valve (570) connected to the air pipe (560) and a second one-way valve (580) connected to the inside of the screening frame (210).

9. An automatic grading and sorting device for tea processing according to claim 8, characterized in that, The air supply sleeve (470) includes a sleeve (471) fixed on a sliding seat (450), a rotating shaft (411) rotatably sleeved inside the sleeve (471), an air chamber (472) is provided inside the sleeve (471), and an air nozzle (473) connected to an air pipe (560) is provided on one side of the air chamber (472); an air passage (414) is axially provided inside the rotating shaft (411), and a plurality of through holes (415) communicating with the interior of the air chamber (472) are provided circumferentially at one end of the air passage (414) located inside the air chamber (472), and a plurality of air blowing grooves (413) communicating with the air passage (414) are provided circumferentially on the rotating shaft (411).

10. A method of using an automatic grading and sorting device for tea processing according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Pour the tea leaves onto the upper screen (220) inside the sieving rack (210). Drive the entire sieving rack (210) to swing back and forth using the shaking unit (300). Use the upper screen (220) and the lower screen (230) to screen the different sizes and structures of the tea leaves. Step 2: The feeder drives the rotating cleaning component (410) to feed laterally along the rack (420). At the same time, under the meshing action of the gear (430) and the rack (420), the rotating cleaning component (410) itself also rotates continuously in the circumferential direction to gently sweep and clean the tea hairs attached to the mesh holes along the lower screen (230). Step 3: During the reciprocating shaking of the sieving frame (210), the inertial vibration unit (500) periodically impacts the sieving frame (210) under the action of inertia, transmitting the vibration to the upper screen (220) and the lower screen (230) to promote the stratification of tea leaves.

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