A device for continuously grading tea leaf

Abstract

The application discloses a kind of tea leaf fresh leaf step-by-step continuous screening device related to the field of agricultural product processing, including box, box is sequentially communicated with coarse layer along top to bottom, the coarse layer includes first negative pressure device, second negative pressure device and vertical inlet pipeline, the top of inlet pipeline has opening, the bottom of inlet pipeline is communicated with spiral pipeline, the width direction of spiral pipeline is communicated with two groups of negative pressure pipeline, negative pressure pipeline includes first negative pressure pipe and second negative pressure pipe, first negative pressure pipe is close to opening, and first negative pressure pipe is communicated with spiral pipeline and first negative pressure device.The technical scheme is used, first tea leaf is poured into inlet pipeline from opening, first negative pressure device and second negative pressure device located beside spiral pipeline are started at this time, and tea leaf in spiral pipeline is initially screened, and at this time, broken leaf and broken slag in tea leaf are adsorbed and absorbed to complete coarse sorting.

Description

Technical Field

[0001] This invention belongs to the field of agricultural product processing, specifically a step-by-step continuous screening device for fresh tea leaves. Background Technology

[0002] Traditional tea sorting machines typically employ either vibrating screens or air-powered sorting. Vibrating screen sorting involves directly pouring tea leaves onto a screen, where a vibrating device strains the leaves for sorting. Air-powered sorting uses a wind mechanism to disperse tea leaves of varying weights to different collection points, achieving the desired sorting effect. Both methods require screens for grading the tea. However, existing screens suffer from problems such as complex installation, high manufacturing costs, poor practicality, and ineffective sorting. Especially in air-powered sorting, while adjusting the grading chamber position can achieve grading, the unpredictable airflow speed and direction often prevents effective grading. Furthermore, existing tea sorting machines often fail to collect impurities after sorting, resulting in significant resource waste. To address these issues, researchers have conducted extensive research and proposed various solutions.

[0003] For example, Chinese patent literature discloses a tea screening machine [application number: 200920182650.7], which includes a bracket, an air duct installed on the frame, and a fan connected to one end of the air duct. The upper part of the fan has a feed inlet, the upper part of the feed inlet is equipped with a feeding trough, and the lower part of the air duct has a large discharge outlet near the fan. The lower outlet of the large funnel is provided with an inclined screening screen.

[0004] While the above-mentioned scheme can effectively utilize the fan and air duct in conjunction with the screening device to grade tea leaves, its overall structural design is flawed. Fine tea stems and tea dust generated during the screening process cannot be collected, resulting in poor controllability and low accuracy in tea grading. Summary of the Invention

[0005] To address the problem of low accuracy in tea grading, the purpose of this invention is to provide a step-by-step continuous sieving device for fresh tea leaves.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A step-by-step continuous screening device for fresh tea leaves includes a box body, and the box body is connected sequentially from top to bottom to a coarse material screening layer, a substandard screening layer, a good product screening layer and a superior product screening layer.

[0007] The coarse separation layer includes a first negative pressure device, a second negative pressure device, and a vertical inlet pipeline. The top of the inlet pipeline has an opening, and the bottom of the inlet pipeline is connected to a spiral pipeline. Two groups of negative pressure pipelines are connected in the width direction of the spiral pipeline. The negative pressure pipelines include a first negative pressure pipe and a second negative pressure pipe. The first negative pressure pipe is close to the opening, and the first negative pressure pipe is connected to the spiral pipeline and the first negative pressure device. The second negative pressure pipe is connected to the spiral pipeline and the second negative pressure device. The height of the first negative pressure pipe is higher than that of the second negative pressure pipe, and the power of the second negative pressure device is greater than that of the first negative pressure device.

[0008] After adopting the above scheme, the following beneficial effects are achieved: 1. When using this technical solution, first pour the tea leaves from the opening into the inlet pipeline. At this time, the tea leaves enter the spiral pipeline along the inlet pipeline for spiral curve movement. At this time, the first negative pressure device and the second negative pressure device beside the spiral pipeline are started to conduct preliminary screening on the tea leaves in the spiral pipeline. At this time, the broken leaves and broken residues in the tea leaves are adsorbed and absorbed to complete the coarse separation.

[0009] 2. Compared with the existing technology for preliminary screening, in this technical solution, the height of the first negative pressure pipe is higher than that of the second negative pressure pipe, and the power of the second negative pressure device is greater than that of the first negative pressure device. Therefore, the tea leaves are screened step by step, and the broken leaves are gradually adsorbed during the movement of the tea leaves.

[0010] Furthermore, there is a group of slopes at the intersection of the coarse separation layer and the defective product screening layer. The slopes gradually converge from the coarse separation layer to the defective product screening layer. At the maximum convergence of the slopes, there is a turntable. The surface of the turntable has a group of feed inlets, and the included angle between the feed inlets is 75°. The turntable is connected to a rotating motor.

[0011] Beneficial effects: 1. Compared with the existing technology for screening broken leaves, in this technical solution, the tea leaves after coarse screening are stacked on the surface of the slopes. At this time, since there is a turntable at the maximum convergence of the slopes, the tea leaves will pass through the turntable and gather on the turntable under the influence of gravity during the continuous downward movement. Some of the tea leaves slide down along both sides of the turntable, and some tea leaves will enter the turntable along the feed inlets of the turntable. The tea leaves entering the feed inlets are those smaller than the diameter of the feed inlets, so as to conduct the second screening.

[0012] Furthermore, the turntable includes an inner ring and an outer ring. The feed inlets are located on the surface of the outer ring. The inner ring has several accommodating cavities. The accommodating cavities have entrances, and the entrances face the outer ring direction. A first turning plate is provided at the entrance. The first turning plate is hinged to the inner ring with a torsion spring. In the natural state of the torsion spring, the turning plate is in a closed state. The external force that causes the torsion spring to deflect is F, the volume between the inner ring and the outer ring is L, the maximum gravity of the fresh tea leaves in L is G, and the centripetal force generated by the turntable is f. F < f + G and F > G.

[0013] Furthermore, the rotation of the turntable is a variable speed motion, with the maximum speed when any feed port of the turntable faces the good product screening layer and the minimum speed when any feed port of the turntable faces the defective product screening layer.

[0014] Beneficial effects: The turntable rotates at varying speeds, generating centripetal force, which facilitates the tea leaves inside the turntable pressing against the rotating plate.

[0015] Furthermore, the overlap between the good product screening layer and the superior product screening layer is provided with an elastic screening mesh, an active rod passes through the center of the elastic screening mesh, the surface of the elastic screening mesh is provided with sieve holes, the active rod is hinged to the turntable, and a rotating arm is connected between the turntable and the active rod.

[0016] Furthermore, a sealing ring is provided between the active rod and the elastic screening screen.

[0017] Furthermore, a funnel is attached below the flexible screening mesh. The funnel includes a wide opening and a narrow opening. The narrow opening faces the premium screening layer, and a second flip plate is hinged to the narrow opening.

[0018] Beneficial effects: 1. When this technical solution is used, the active rod is driven by the rotating arm to make vertical linear motion. Therefore, the active rod drives the elastic screening net to vibrate up and down. At this time, the elastic screening net begins to reciprocate, turning and screening the tea leaves at this point, and gradually screening the tea leaves smaller than the screen holes into the next layer.

[0019] 2. Since the tea leaves have kinetic energy, they are collected by a funnel, so that the initial velocity of the tea leaves becomes 0 and the tea leaves are only affected by gravity. When the tea leaves are piled up and the second flip plate is opened, the tea leaves are processed in batches.

[0020] Furthermore, directly below the narrow opening is a screening group, which includes a base plate. Support columns are fixedly connected to the surface of the base plate, and rubber pads are adhered to the surface of the support columns.

[0021] Furthermore, the surface of the premium screening layer has several grading grooves, the diameter of which gradually decreases from near to far along the screening group.

[0022] Beneficial effects: After the kinetic energy is eliminated, the tea leaves open the second flip plate and fall. At this time, since there is a screening group directly below the narrow opening, the falling tea leaves continuously hit the screening group. When the tea leaves hit the rubber pad, they are bounced back by the rubber pad according to their own weight. The bounced tea leaves will fall into different grading troughs according to the distance they bounced. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Structural diagram of the transfer plate. Detailed Implementation

[0025] The following is a further detailed description through specific embodiments:

[0026] The reference numerals in the drawings of the specification include: box body 1, coarse material separation layer 2, defective product screening layer 3, good product screening layer 4, excellent product screening layer 5, first negative pressure device 6, second negative pressure device 7, inlet pipeline 8, spiral pipeline 9, slope 10, turntable 11, feed inlet 12, accommodation cavity 13, elastic screening net 14, rotating arm 15, driving rod 16, sealing ring 17, funnel 18, second turning plate 19, bottom plate 20, support column 21, rubber pad 22, grading groove 23.

[0027] The embodiment is basically as shown in the attached Figure 1 figures: A tea fresh leaf progressive continuous screening device includes a box body 1, and the box body 1 is sequentially connected with a coarse material separation layer 2, a defective product screening layer 3, a good product screening layer 4, and an excellent product screening layer 5 from top to bottom;

[0028] The coarse material separation layer 2 includes a first negative pressure device 6, a second negative pressure device 7, and a vertical inlet pipeline 8. The top of the inlet pipeline 8 has an opening, the bottom of the inlet pipeline 8 is connected with a spiral pipeline 9, two groups of negative pressure pipelines are connected in the width direction of the spiral pipeline 9, the negative pressure pipelines include a first negative pressure pipe and a second negative pressure pipe. The first negative pressure pipe is close to the opening, and the first negative pressure pipe is connected to the spiral pipeline 9 and the first negative pressure device 6. The second negative pressure pipe is connected to the spiral pipeline 9 and the second negative pressure device 7. The height of the first negative pressure pipe is higher than that of the second negative pressure pipe, and the power of the second negative pressure device 7 is greater than that of the first negative pressure device 6.

[0029] There is a group of slopes 10 at the intersection of the coarse material separation layer 2 and the defective product screening layer 3. The slopes 10 gradually converge from the coarse material separation layer 2 to the defective product screening layer 3. The maximum converging place of the slopes 10 is provided with a turntable 11. The surface of the turntable 11 has a group of feed inlets 12, and the included angle between the feed inlets 12 is 75°. The turntable 11 is connected with a rotating motor.

[0030] Please refer to Figure 2 , the turntable 11 includes an inner ring and an outer ring. The feed inlets 12 are located on the surface of the outer ring. The inner ring has a plurality of accommodation cavities 13. The accommodation cavities 13 have entrances, and the entrances face the outer ring direction. A first turning plate is provided at the entrance. A torsion spring is hinged between the first turning plate and the inner ring. In the natural state of the torsion spring, the turning plate is in a closed state. The external force that causes the torsion spring to deflect is F, the volume between the inner ring and the outer ring is L, the maximum gravity of the tea fresh leaves in L is G, and the centripetal force generated by the turntable 11 is f. F < f + G and F > G.

[0031] The rotation of the turntable 11 is a variable speed motion, with the maximum speed when any feed port 12 of the turntable 11 faces the good product screening layer 4 and the minimum speed when any feed port 12 of the turntable 11 faces the defective product screening layer 3. The overlap between the good product screening layer 4 and the superior product screening layer 5 is provided with an elastic screening mesh 14. An active rod 16 passes through the center of the elastic screening mesh 14. The surface of the elastic screening mesh 14 has sieve holes. The active rod 16 is hinged to the turntable 11, and a rotating arm 15 connects the turntable 11 and the active rod 16.

[0032] A sealing ring 17 is provided between the active rod 16 and the elastic screening net 14. A funnel 18 is supported below the elastic screening net 14. The funnel 18 includes a wide mouth and a narrow mouth. The narrow mouth faces the premium screening layer 5 and is hinged to a second flip plate 19. A screening group is located directly below the narrow mouth. The screening group includes a base plate 20. A support column 21 is fixedly connected to the surface of the base plate 20. A rubber pad 22 is adhered to the surface of the support column 21. The surface of the premium screening layer 5 has several grading grooves 23. The diameter of the grading grooves 23 gradually decreases from near to far along the screening group.

[0033] The specific implementation process is as follows: When using this technical solution, the tea leaves are first poured into the inlet pipe 8 from the opening. At this time, the tea leaves enter the spiral pipe 9 along with the inlet pipe 8 and move in a spiral curve. At this time, the first negative pressure device 6 and the second negative pressure device 7 located next to the spiral pipe 9 are activated to perform preliminary screening of the tea leaves in the spiral pipe 9. At this time, the broken leaves and debris in the tea leaves are adsorbed and absorbed to complete the coarse sorting.

[0034] The height of the first negative pressure pipe is higher than that of the second negative pressure pipe, and the power of the second negative pressure device 7 is greater than that of the first negative pressure device 6. Therefore, the tea leaves are screened step by step, and the broken leaves are gradually adsorbed during the movement of the tea leaves. Compared with the existing technology for screening broken leaves, in this technical solution, the tea leaves after coarse screening accumulate on the surface of the slope 10. At this time, since a turntable 11 is provided at the maximum point of the slope 10, the tea leaves will pass through the turntable 11 during the continuous downward movement under the influence of gravity, and the tea leaves will gather on the turntable 11. Some of the tea leaves slide down along the two sides of the turntable 11, and some of the tea leaves will enter the turntable 11 through the feed inlet 12. The tea leaves entering the feed inlet are smaller than the diameter of the feed inlet, thus performing a second screening.

[0035] Turntable 11 rotates at a variable speed, generating centripetal force, which facilitates the tea leaves inside the turntable 11 to squeeze the flipping plate. Subsequently, the drive rod 16 is driven by the rotating arm 15 to perform vertical linear motion, thus the drive rod 16 drives the elastic screening screen 14 to vibrate up and down. At this time, the elastic screening screen 14 begins to reciprocate, flipping and screening the tea leaves, gradually sifting tea leaves smaller than the sieve holes into the next layer. Since the tea leaves have kinetic energy, the funnel 18 is used to receive the tea leaves, so that the initial velocity of the tea leaves becomes 0 and the tea leaves are only affected by gravity. When the tea leaves accumulate and the second flipping plate 19 is opened, the tea leaves are processed in batches.

[0036] After the kinetic energy is released, the tea leaves open the second flip plate 19 and fall. At this time, since there is a screening group directly below the narrow opening, the falling tea leaves continuously hit the screening group. When the tea leaves hit the rubber pad 22, they are bounced back by the rubber pad 22 according to their own weight. The bounced tea leaves will fall into different grading troughs 23 according to the distance they bounced.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation 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 step-by-step continuous screening device for fresh tea leaves, characterized in that: It includes a box body, and the box body is successively connected with a coarse material separation layer, a defective product screening layer, a qualified product screening layer, and a superior product screening layer from top to bottom; The coarse material separation layer includes a first negative pressure device, a second negative pressure device, and a vertical inlet pipeline. The top of the inlet pipeline has an opening, the bottom of the inlet pipeline is connected to a spiral pipeline, and two negative pressure pipelines are connected in the width direction of the spiral pipeline. The negative pressure pipelines include a first negative pressure pipe and a second negative pressure pipe. The first negative pressure pipe is close to the opening, and the first negative pressure pipe is connected to the spiral pipeline and the first negative pressure device. The second negative pressure pipe is connected to the spiral pipeline and the second negative pressure device. The height of the first negative pressure pipe is higher than that of the second negative pressure pipe, and the power of the second negative pressure device is greater than that of the first negative pressure device; There is a set of slopes at the intersection of the coarse material separation layer and the defective product screening layer. The slopes gradually converge from the coarse material separation layer to the defective product screening layer. At the maximum convergence of the slopes, there is a turntable. The surface of the turntable has a set of feed ports, and the included angle between the feed ports is 75°. The turntable is connected to a rotating motor; The turntable includes an inner ring and an outer ring. The feed ports are located on the surface of the outer ring. The inner ring has several accommodating cavities. The accommodating cavities have entrances, and the entrances face the outer ring direction. A first flipping plate is provided at the entrance. A torsion spring is hinged between the first flipping plate and the inner ring. In the natural state of the torsion spring, the flipping plate is in a closed state. The external force that causes the torsion spring to deflect is F, the volume between the inner ring and the outer ring is L, the maximum gravity of fresh tea leaves in L is G, and the centripetal force generated by the turntable is f. F < f + G and F > G; The rotation of the turntable is a variable-speed motion. Among them, the speed is the maximum when any feed port of the turntable faces the qualified product screening layer, and the speed is the minimum when any feed port of the turntable faces the defective product screening layer.

2. The step-by-step continuous screening device for fresh tea leaves according to claim 1, characterized in that: There is an elastic screening net at the coincidence of the qualified product screening layer and the superior product screening layer. A driving rod passes through the center of the elastic screening net. The surface of the elastic screening net has sieve holes. The driving rod is hinged with the turntable, and a rotating arm is connected between the turntable and the driving rod.

3. The step-by-step continuous screening device for fresh tea leaves according to claim 2, characterized in that: A sealing ring is provided between the driving rod and the elastic screening net.

4. The step-by-step continuous screening device for fresh tea leaves according to claim 3, characterized in that: A funnel is承接下方 the elastic screening net. The funnel includes a wide mouth and a narrow mouth. The narrow mouth faces the superior product screening layer, and a second flipping plate is hinged at the narrow mouth.

5. The step-by-step continuous screening device for fresh tea leaves according to claim 4, characterized in that: Directly below the narrow mouth is a screening group. The screening group includes a bottom plate. Support columns are fixedly connected to the surface of the bottom plate, and rubber pads are bonded to the surface of the support columns.

6. The step-by-step continuous screening device for fresh tea leaves according to claim 5, characterized in that: The surface of the superior product screening layer has several grading grooves, and the diameter of the grading grooves gradually decreases from near to far along the screening group.

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