Tea dust screening device and screening method

Abstract

The invention belongs to the technical field of tea processing, and particularly relates to a tea dust screening device and method, and the tea dust screening device comprises a screening box, a screening plate, a transverse swinging module and a longitudinal rotating module. The transverse swinging module comprises a driving assembly, a rotating rod and a movable frame, the movable frame is arranged on the outer side of the screening box in a sleeving mode and is in sliding connection with the screening box, the driving assembly is used for driving the movable frame to do linear reciprocating motion, one end of the rotating rod is connected with the screening plate, and the other end of the rotating rod is rotationally connected to the movable frame; the driven shaft and the rotating rod are coaxially fixed, a spiral guide groove is formed in the side wall of the driven shaft, the driven shaft is sleeved with the limiting sleeve, the limiting column is fixedly connected to the inner wall of the limiting sleeve and matched with the spiral guide groove, and the driven shaft achieves longitudinal reciprocating rotation of the screening plate through matching of the spiral guide groove and the limiting column in the linear reciprocating motion process. According to the device, dust in tea leaves can be more sufficiently screened out, and the cleanliness of the tea leaves is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of tea processing, and particularly relates to a tea powder screening device and a screening method. Background Art

[0002] Traditional Chinese medicine believes that tea has a variety of pharmacological effects, and different teas have different pharmacological effects. These different pharmacological effects make tea play an important role in the treatment and prevention of various diseases in traditional Chinese medicine. Among them, for selenium-rich tea, because it contains rich selenium elements, selenium is one of the essential trace elements for the human body and plays an important role in maintaining human health. In traditional Chinese medicine theory, using selenium elements and other antioxidant substances in selenium-rich tea, such as polyphenols and vitamin C, can help scavenge free radicals and reduce the damage caused by oxidative stress to the body. Long-term drinking of selenium-rich tea can enhance the body's antioxidant capacity and delay the aging process. And selenium elements are considered to have the potential to anti-cancer. The selenium elements in selenium-rich tea can inhibit the growth of tumor cells and promote the apoptosis of tumor cells. In the treatment of tumors, traditional Chinese medicine pays attention to adjusting the overall state of the human body and controlling the development of the disease by the method of strengthening the healthy qi and eliminating pathogenic factors. Selenium-rich tea can play a role in this process and assist in treatment. Therefore, in recent years, the application of selenium-rich tea in traditional Chinese medicine adjuvant treatment has been extremely extensive. However, tea is prone to produce powder during the processing stages such as raw material treatment, rolling, and pressing. Especially in the rolling link, rolling is a key step in tea processing. By mechanical pressure, the cell wall of tea is broken to release tea juice and aroma. In this process, tea is easily broken due to friction and extrusion. Especially for large-leaf tea varieties with brittle texture like selenium-rich tea, the generation of powder is more significant. Excessive powder not only affects the quality of tea, but also when brewing and drinking, the powder is easy to release substances such as tea polyphenols and caffeine too quickly, which will cause the tea soup to be bitter or too concentrated, affecting the taste of the tea water. Therefore, screening out tea powder is a necessary step to improve the quality and taste of tea.

[0003] Some existing tea powder screening devices can screen the tea powder in the tea during the tea production process. However, since the tea is generally concentrated in the screening equipment during the screening process, the screening of the powder is not thorough. For example, the Chinese patent with the publication number CN115569835A provides a device for removing the powder after wrapping and kneading in the preparation of raw tea. During screening, the movable block drives the rotating rod to rotate reciprocally through the connecting plate, and drives the limiting plate to swing reciprocally, so as to drive the screening box to swing reciprocally along the length direction of the first fixed rod through the limiting block, so as to screen the tea in the screening box. In this screening method, the tea is always concentrated in the screening box during the screening process. During the reciprocating swing of the screening box, the tea near the bottom of the screening hole at the bottom can separate the powder, while the tea piled up in the middle and upper layers will always pile up together with the inertia of the swing and is difficult to disperse, resulting in the powder being difficult to be fully screened out. Another example is the Chinese patent with the publication number CN220048992U, which provides a rapid screening device for tea processing, including a screening box. A first guide plate and a second guide plate are fixedly connected in the screening box respectively. The first guide plate is located above the second guide plate. The screening box is fixedly connected with a feed pipe, and the screening box is provided with a discharge port. When the tea falls, air is blown to it. Using the weights of the powdered tea and the whole tea as the screening index, the powdered tea is blown into the guide pipe by the wind, and the whole tea slides into the material box through the second guide plate, thereby removing the powder in the tea. However, in this way of removing the powder, when the wind force is too large, the tea near the blowing position is easily blown out with the powder, and when the wind force is small, the powder far from the blowing position is difficult to be fully blown out, resulting in the powder being difficult to be fully screened out. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a tea powder screening device and a screening method, which can more fully screen out the tea powder and improve the cleanliness of the tea.

[0005] The technical solution of the present invention is as follows: A tea powder screening device includes a screening box and a screening plate arranged inside the screening box, and further includes: A lateral swing module, including a driving component, a rotating rod and a movable frame. The movable frame is sleeved outside the screening box and is slidably connected thereto. The movable frame is connected to the output end of the driving component. The driving component is installed on the screening box and is used to drive the movable frame to move linearly and reciprocally. One end of the rotating rod is detachably connected to the screening plate, and the other end is inserted through the movable frame and is rotatably connected thereto. The screening plate is symmetrically arranged about the axis of the rotating rod; The longitudinal rotation module includes a driven shaft, a limit sleeve and a limit column. One end of the driven shaft is fixed to the rotating rod, and the two are coaxial. A spiral guide groove is provided on the driven shaft, and the limit sleeve is sleeved on the driven shaft. The limit column is fixedly connected to the inner wall of the limit sleeve and one end slides in the spiral guide groove. The limit sleeve is fixedly connected to the side wall of the screening box. The driven shaft realizes the longitudinal reciprocating rotation of the screening plate through the cooperation of the spiral guide groove and the limit column during the linear reciprocating motion.

[0006] Preferably, a blowing assembly for blowing away the tea leaves on the screening plate is further provided on one side of the screening box, and the blowing assembly comprises: A blower, mounted on the screening box; A shunt pipe is connected to the air outlet of the blower, the shunt pipe is arranged along the length direction of the sieve plate, and a plurality of blowing ports are evenly distributed on the shunt pipe; A plurality of first blowing pipes are connected to the plurality of blowing ports in a one-to-one correspondence, and the plurality of first blowing pipes are inserted through the side wall of the screening box. One end of the first blowing pipe away from the diversion pipe extends into the screening box opposite to the upper side surface of the screening plate.

[0007] Preferably, the plurality of first blowing pipes are all arranged at an inclination, and the end of the first blowing pipe away from the diverter pipe is the lower end in the inclination direction, and the inclination angles between two adjacent first blowing pipes and the diverter pipe are different.

[0008] Preferably, extended screen plates are respectively provided on both sides of the screen plate parallel to its rotation direction, the extended screen plate is parallel to the screen plate, and the lower side wall of the extended screen plate is fitted with the upper side wall of the screen plate, a convex strip is fixedly connected to the lower side of one end of the extended screen plate away from the screen plate, a plurality of movable rods are evenly distributed on the side of the convex strip facing the screen plate, one end of the movable rod away from the convex strip is inserted into the matching hole on the screen plate and connected through an elastic member, a roller is rotatably connected to the side of the convex strip away from the screen plate, and the roller is fitted with the side wall of the screen box under the action of the elastic member.

[0009] Preferably, the drive assembly comprises: A rotary driver, mounted on the outer side wall of the screening box and having an output shaft; A first incomplete gear, sleeved and fixed on the output shaft; A first rack, fixedly connected to the movable frame and meshing with the first incomplete gear; The first elastic structure is arranged between the movable frame and the side wall of the screening box.

[0010] Preferably, the upper side of the screening box is open, and a feeding trough is installed on the opening of the screening box. Both ends of the feeding trough are slidably connected to the screening box, and the feeding trough is connected to the output rotating shaft through a transmission assembly. The transmission assembly is used to drive the feeding trough to reciprocate on the opening of the screening box by the driving of the output rotating shaft.

[0011] Preferably, a flow-limiting assembly is arranged on the side of the feeding trough facing the outlet of the screening box. The flow-limiting assembly is used to adjust the unit flow of the tea leaves in the feeding trough to the screening box.

[0012] Preferably, a diversion channel is also arranged between the outlet of the feeding trough and the screening box. Cavity shells are fixedly connected to the opposite side walls of the diversion channel. The side walls between the cavity shells and the diversion channel are provided with screening nets, and partitions are arranged in each cavity shell. The partitions are used to divide the cavity shell into a blowing cavity and a slag collection cavity. The blowing cavity is connected to the air outlet of the blower through a plurality of second blowing pipes.

[0013] Preferably, shielding plates are fixedly connected to both sides of the diversion channel perpendicular to the moving direction of the feeding trough. A plurality of rubber bands are evenly distributed on the side walls of the shielding plates facing the screening box, and a material-pushing block is fixedly connected to the lower end of the rubber pad.

[0014] According to the above-mentioned tea powder screening device for processing selenium-rich tea, the screening method for tea includes the following steps: Start the driving assembly to drive the movable frame to move linearly back and forth. Utilize the reciprocating movement of the movable frame to realize the linear reciprocating movement of the screening plate in cooperation with the rotating rod, and realize the lateral swing of the screening plate; The reciprocating movement of the rotating rod drives the driven shaft to reciprocate. During the movement of the driven shaft, the spiral guide groove on the driven shaft realizes the rotation of the driven shaft through the limiting cooperation with the limiting posts on the inner wall of the limiting sleeve, and then indirectly realizes the rotation of the screening plate. And utilize the reciprocating movement of the driven shaft to realize the reciprocating rotation of the screening plate with the axis of the rotating rod as the rotation center, that is, realize the longitudinal swing of the screening plate; Uniformly put the tea leaves to be screened on the screening plate. Utilize the lateral swing and longitudinal swing of the screening plate to realize the staggered tumbling of the tea leaves on the screening plate, fully tumble and disperse the tea leaves piled up on the upper and middle layers downward, so that the tea powder in the tea leaves can more fully pass through the mesh on the screening plate and fall to the bottom of the screening box, and the complete tea leaves remain on the screening plate and can be taken out after the screening is completed.

[0015] Compared with the prior art, the tea powder screening device and screening method of the present invention have the following beneficial effects: When the device is in use, the driving component is utilized to drive the movable frame to perform linear reciprocating motion. The reciprocating motion of the movable frame, in cooperation with the rotating rod, realizes the linear reciprocating motion of the screening plate, that is, realizes the lateral swing of the screening plate. Furthermore, under the reciprocating motion of the movable frame, the rotating rod also drives the driven shaft to reciprocate. During the movement of the driven shaft, the spiral guide groove on the driven shaft, through the limiting cooperation with the limiting column on the inner wall of the limiting sleeve, realizes the rotation of the driven shaft, and then indirectly realizes the rotation of the screening plate. And the reciprocating motion of the driven shaft realizes the reciprocating rotation of the screening plate with the axis of the rotating rod as the rotation center, that is, realizes the longitudinal swing of the screening plate. Thus, by utilizing the lateral swing and longitudinal swing of the screening plate, the tea leaves are turned crosswise on the screening plate, enabling the tea leaves to be fully dispersed, and enabling the tea leaf fragments to be screened out more thoroughly, improving the screening quality and effect of the tea leaves. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure from the first perspective in an embodiment of the present invention; Figure 2 is a schematic diagram of the overall structure from the second perspective in an embodiment of the present invention; Figure 3 is a schematic diagram of the partial enlarged structure in an embodiment of the present invention; Figure 4 is a longitudinal sectional view of the overall structure in an embodiment of the present invention; Figure 5 is a transverse sectional view of the overall structure in an embodiment of the present invention; Figure 6 is Figure 5 a schematic diagram of the enlarged structure at A in Figure 7 is a schematic diagram of the structure of the driving component in an embodiment of the present invention; Figure 8 is a schematic diagram of the enlarged view of a part of the structure in an embodiment of the present invention.

[0017] Description of the Reference Numerals: 1. Screening box; 2. Screening plate; 3. Driving assembly; 31. Rotary driver; 32. First incomplete gear; 33. First rack; 34. First elastic structure; 341. Spring; 342. Slide block; 343. Guide rod; 344. Stop block; 4. Rotating rod; 5. Movable frame; 6. Driven shaft; 7. Limiting sleeve; 8. Limiting column; 9. Spiral guide groove; 10. Blowing assembly; 101. Blower; 102. Diverging pipe; 103. First blowing pipe; 104. Main pipe; 105. Transmission hose; 106. Branch pipe; 107. Second blowing pipe; 11. Extended screening plate; 12. Rib; 13. Movable rod; 14. Elastic member; 15. Roller; 16. Feeding chute; 17. Transmission assembly; 171. Second incomplete gear; 172. Second rack; 173. Second elastic structure; 18. Flow-limiting assembly; 19. Diversion channel; 20. Cavity housing; 21. Screening mesh; 22. Partition board; 23. Air supply chamber; 24. Slag collection chamber; 25. Baffle plate; 26. Rubber belt; 27. Material-pushing block; 28. Cover plate. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the premise that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0021] See Figures 1 to 8As shown, in order to more fully screen out the tea powder in the tea leaves and improve the cleanliness of the tea leaves. Especially for selenium-rich tea in traditional Chinese medicine treatment, when formulating a drug formula, in order to avoid having too much tea powder involved to ensure the accuracy of the formula. This embodiment provides a tea powder screening device, which includes a screening box 1 and a screening plate 2 arranged inside the screening box 1. The upper side of the screening box 1 is open for facilitating the feeding of the tea leaves to be screened. Furthermore, this device also includes a turning unit for dispersing the tea leaves on the screening plate 2. The turning unit includes a transverse swinging module and a longitudinal rotating module. The transverse swinging module includes a driving component 3, a rotating rod 4, and a movable frame 5. The movable frame 5 is sleeved outside the screening box 1 and the two are slidably connected. And the movable frame 5 is connected to the output end of the driving component 3. The driving component 3 is installed on the screening box 1 for driving the movable frame 5 to move linearly back and forth. The rotating rod 4 is parallel to the moving direction of the movable frame 5. One end of the rotating rod 4 is detachably connected to the screening plate 2 by bolts or pins. The other end penetrates through and is rotatably connected to the movable frame 5. And a limiting structure is provided between the rotating rod 4 and the movable frame 5. The limiting structure includes limiting plates arranged on both sides of the rotating rod 4 located in the movable frame 5 for limiting the movement of the rotating rod 4 on the movable frame 5. The screening plate 2 is symmetrically arranged about the axis of the rotating rod 4. The longitudinal rotating module includes a driven shaft 6, a limiting sleeve 7, and a limiting post 8. One end of the driven shaft 6 is fixedly connected to the rotating rod 4 and they are coaxial. A spiral guide groove 9 is formed on the driven shaft 6. The limiting sleeve 7 is sleeved on the driven shaft 6. And a limiting post 8 adapted to the spiral guide groove 9 is fixedly connected to the inner wall of the limiting sleeve 7. The limiting sleeve 7 is fixedly connected to the side wall of the screening box 1 through a fixing rod. The driven shaft 6 realizes the longitudinal reciprocating rotation of the screening plate 2 through the cooperation of the spiral guide groove 9 and the limiting post 8 during the linear reciprocating movement process. Preferably, under the cooperation of the spiral guide groove 9 and the limiting post 8, the rotation angle range of the screening plate 2 should be controlled between 10° and 20° optimally. If the rotation angle is too large, it is easy to cause a large gap between the screening plate 2 and the screening box 1, making the intact tea leaves fall to the bottom of the screening box 1 and mix with the tea powder. If the rotation angle is too small, the tea leaves on the screening plate 2 cannot roll sufficiently longitudinally.

[0022] Thus, when screening and cleaning the tea powder in the tea, the device uses the driving component 3 to drive the movable frame 5 to move linearly back and forth. The reciprocating movement of the movable frame 5, in cooperation with the rotating rod 4, realizes the linear reciprocating movement of the screening plate 2, that is, realizes the lateral swing of the screening plate 2. Furthermore, under the reciprocating movement of the movable frame 5, the rotating rod 4 also drives the driven shaft 6 to move back and forth. During the movement of the driven shaft 6, the spiral groove 9 on the driven shaft 6, through the limiting cooperation with the limiting post 8 on the inner wall of the limiting sleeve 7, realizes the rotation of the driven shaft 6, and then indirectly realizes the rotation of the screening plate 2. And using the reciprocating movement of the driven shaft 6, the screening plate 2 rotates back and forth with the axis of the rotating rod 4 as the rotation center, that is, realizes the longitudinal swing of the screening plate 2. Thus, by using the lateral swing and longitudinal swing of the screening plate 2, the tea is turned over in a crisscross manner on the screening plate 2, so that the tea can be fully dispersed, and the tea powder can be screened out more thoroughly, improving the screening quality and effect of the tea.

[0023] See Figure 2 and Figure 5 As shown, further, in order to improve the effect of cleaning the tea powder in the tea and make the powder be screened out sufficiently. A blowing component 10 for blowing the tea on the screening plate 2 is also provided on one side of the screening box 1. The blowing component 10 includes a blower 101, a shunt pipe 102 and a plurality of first blowing pipes 103. The blower 101 is installed on the screening box 1, and a main pipe 104 is connected to the air outlet of the blower 101. The shunt pipe 102 is communicated with the main pipe 104 through a transmission hose 105, and the shunt pipe 102 is arranged along the length direction of the screening plate 2. Preferably, the shunt pipe 102 is easily arranged to be parallel to the axis of the rotating rod 4. And a plurality of air blowing ports are evenly distributed on the shunt pipe 102 along the length direction. Each air blowing port is communicated with a first blowing pipe 103. The first blowing pipe 103 is inserted through the side wall of the screening box 1, and the end of the first blowing pipe 103 away from the shunt pipe 102 extends into the screening box 1 and faces the upper side of the screening plate 2. Thus, by using the arrangement of the plurality of first blowing pipes 103, during the rolling of the tea on the screening plate 2, the wind can better ensure that the stacked tea is dispersed, so that the tea stacked on the upper layer and in the middle can be fully screened by the screening plate 2, and the tea powder is removed more thoroughly.

[0024] See Figure 5As shown, further, in order to enhance the dispersing effect of tea leaves, the broken tea leaves are fully screened out. The multiple first blowing pipes 103 are all inclined, and the end of the first blowing pipe 103 away from the diverter pipe 102 is the lower end of the inclined direction, and the inclination angles between the two adjacent first blowing pipes 103 and the diverter pipe 102 are different. Therefore, by using different settings of the inclination angle, the wind direction blown out by the first blowing pipe 103 is changed, that is, it is possible to achieve blowing at different positions of the screening plate 2 in the longitudinal direction, so that the tea leaves on the screening plate 2 are more fully dispersed and the broken tea leaves are processed more thoroughly.

[0025] See also Figure 5 and Figure 6 As shown, further, in order to improve the screening effect, the tea leaves are fully screened out. The screening plate 2 preferably adopts an arc structure or a horizontal structure. When the arc structure is adopted, the concave part of the screening plate 2 faces upward. Further, an extended screen plate 11 is provided on both sides of the screening plate 2 parallel to its rotation direction, and the extended screen plate 11 is parallel to the screening plate 2, and the lower side wall of the extended screen plate 11 is fitted with the upper side wall of the screening plate 2. The lower side of the extended screen plate 11 away from the end of the screening plate 2 is fixedly connected with a convex strip 12, and the side of the convex strip 12 facing the screening plate 2 is evenly distributed with a plurality of movable rods 13, and the end of the movable rod 13 away from the convex strip 12 is inserted into the matching hole on the screening plate 2 and connected by an elastic member 14, and the preferred elastic member 14 is preferably a spring 341. The side of the convex strip 12 away from the screening plate 2 is rotatably connected to the roller 15, and the roller 15 is fitted with the side wall of the screening box 1 under the action of the elastic member 14. Therefore, during the reciprocating rotation of the screen plate 2, with the cooperation of the spring 341, as the inclination angle of the screen plate 2 changes, the movable rods 13 connected to the extended screen plate 11 on both sides will extend out of the matching holes at different lengths to adaptively adjust the position of the extended screen plate 11, thereby indirectly increasing or decreasing the width of the screen plate 2 according to the change in the inclination angle of the screen plate 2, so that the two sides of the screen plate 2 can prevent the complete tea leaves from falling to the bottom of the screen plate 2 with the cooperation of the extended screen plate 11. In addition, the design of the roller 15 on the convex strip 12 can ensure the smooth rotation of the screen plate 2.

[0026] See also Figure 5 , Figure 7 and Figure 8As shown, further, in order to improve the effect of cleaning tea dust so that the dust can be fully screened out. The driving assembly 3 includes a rotary driver 31, a first incomplete gear 32, a first rack 33 and a first elastic structure 34. The rotary driver 31 is preferably a servo motor or a stepper motor, installed on the outer side wall of the screening box 1 and having an output rotating shaft. The rotation direction of the output rotating shaft is perpendicular to the axis of the rotating rod 4. Further, the first incomplete gear 32 is sleeved and fixed on the output rotating shaft; the first rack 33 is fixedly connected to the movable frame 5 and meshes with the first incomplete gear 32; the first elastic structure 34 is arranged between the movable frame 5 and the side wall of the screening box 1. The first elastic structure 34 includes a spring 341, a slider 342, a guide rod 343 and a stop block 344. One end of the slider 342 is fixedly connected to the inner wall of the movable frame 5, and the other end slides in the guide groove on the side wall of the screening box 1. The guide rod 343 is parallel to the sliding direction of the slider 342, and the sliding direction of the slider 342 is consistent with the sliding direction of the movable frame 5. One end of the guide rod 343 is fixedly connected to the slider 342, and the other end is sleeved with the stop block 344, and the stop block 344 is fixed to the side wall of the screening box 1. The spring 341 is sleeved on the guide rod 343, and the spring 341 is located between the slider 342 and the stop block 344. Preferably, two groups of the first elastic structures 34 are arranged, and the two groups are respectively arranged on both sides of the first incomplete gear 32. Thus, when screening tea, the rotary driver 31 is started to drive the first incomplete gear 32 to rotate through the output rotating shaft. The first incomplete gear 32 realizes intermittent meshing with the first rack 33 during rotation. When the first incomplete gear 32 meshes with the first rack 33, the movable frame 5 moves in the first direction. When the first incomplete gear 32 disengages from the first rack 33, under the action of the spring 341, the movable frame 5 moves backward and resets. In this way, under the intermittent meshing of the first incomplete gear 32 and the first rack 33, the linear reciprocating motion of the screening plate 2 can be indirectly realized, so that the tea on the screening plate 2 swings and spreads horizontally. By cooperating with the longitudinal swing of the screening plate 2, the turnover effect of the tea on the screening plate 2 can be effectively improved, so that the tea dust can be fully removed.

[0027] See Figure 1 and Figure 2 As shown, further, in order to improve the effect of cleaning tea dust so that the dust can be fully screened out. The upper side of the screening box 1 is open, and a feeding trough 16 is erected on the opening of the screening box 1. Both ends of the feeding trough 16 are slidably connected to the screening box 1, and the feeding trough 16 is connected to the output rotating shaft through a transmission assembly 17. The transmission assembly 17 is used to drive the feeding trough 16 to reciprocate on the opening of the screening box 1 through the drive of the output rotating shaft. See Figure 7 and Figure 8As shown, the transmission assembly 17 includes a second incomplete gear 171, a second rack 172, and a second elastic structure 173. The second incomplete gear 171 is sleeved and fixed on the output rotating shaft of the rotary driver 31. The second rack 172 is fixed on the side wall of the feeding chute 16 through a moving block. The moving block slides in the chute on the side wall of the screening box 1. The second rack 172 is meshed with the second incomplete gear 171. The second spring 341 structure is the same as the first elastic structure 34, and the second elastic structure 173 is arranged between the moving block and the screening box 1. Thus, after the rotary driver 31 is started, the output rotating shaft can drive the second incomplete gear 171 and the first incomplete gear 32 to rotate simultaneously. During the rotation of the second incomplete gear 171, it intermittently meshes with the second rack 172 and cooperates with the second elastic structure 173, enabling the feeding chute 16 to reciprocate along the length direction of the screening plate 2 at the opening of the screening box 1, so as to facilitate the uniform distribution of tea leaves on the screening plate 2. Preferably, the reciprocating movement range of the feeding chute 16 is half of the length of the screening chute opening, thus ensuring that the tea leaves can be fully screened on the screening plate 2.

[0028] See Figure 1 and Figure 4 As shown, further, in order to improve the effect of cleaning tea powder in the tea leaves and enable the tea powder to be fully screened out. A flow-limiting assembly 18 is arranged on the outlet side of the feeding chute 16 facing the screening box 1. The flow-limiting assembly 18 is used to adjust the unit flow rate of the tea leaves in the feeding chute 16 into the screening box 1. The flow-limiting assembly 18 includes a motor, a transmission shaft, and a plurality of material-receiving plates. The two ends of the transmission shaft are rotatably connected to the side wall of the feeding chute 16, and one end of the transmission shaft passes through the feeding chute 16 and is connected to the motor installed on the outer wall of the feeding chute 16. The material-receiving plates are circumferentially and arrayedly distributed on the periphery of the transmission shaft. Thus, by driving the transmission shaft to rotate with the motor, the material-receiving plates can quantitatively input the tea leaves in the feeding chute 16 into the screening box 1 per unit time. By controlling the rotation speed of the motor, the flow rate of the tea leaves entering the screening box 1 per unit time can be effectively controlled. Through cooperation with the reciprocating movement of the feeding chute 16, the tea leaves can be evenly fed and evenly placed on the screening plate 2 to achieve full screening, enabling the tea powder to be more thoroughly screened and removed.

[0029] See Figures 1 to 5As shown, further, in order to improve the effect of cleaning the tea leaves, the tea leaves can be fully screened out. A guide channel 19 is also provided between the outlet of the feeding trough 16 and the screening box 1. The upper end of the guide channel 19 is connected to the feeding trough 16, and the lower end is directly opposite to the opening of the screening box 1. The lower end of the guide channel 19 is fixed to one end of the moving block, so that the reciprocating motion of the guide channel 19 and the feeding trough 16 as a whole is realized through the sliding connection between the moving block and the screening box 1. The two opposite side walls of the guide channel 19 are fixedly connected with a cavity shell 20, the side wall between the cavity shell 20 and the guide channel 19 is set with a screening net 21, and a partition 22 is set in each cavity shell 20, the partition 22 is used to separate the cavity shell 20 into an air supply chamber 23 and a slag collection chamber 24, the air supply chamber 23 and the slag collection chamber 24 on both sides are staggered up and down, and the air supply chamber 23 is connected to the air outlet of the blower 101 through a plurality of second blowing pipes 107. Preferably, the blower 101 is fixed on one side of the feeding trough 16, and the main pipeline 104 of the blower 101 is connected to a branch pipeline 106 corresponding to the two air supply chambers 23, and the branch pipeline 106 is connected to the corresponding air supply chamber 23 through a plurality of second blowing pipes 107. Therefore, when screening tea leaves, the blower 101 is used to provide a certain pressure wind speed in the two air supply chambers 23, and the air supply chamber 23 blows the falling tea leaves through the screening net 21, so that the tea leaves enter the residue collecting chamber 24 on the opposite side from the screening net 21 on the other side, and the two air supply chambers 23 staggered up and down are set up, so that the tea leaves can be blown on the left and right sides of the falling tea leaves, so that the tea leaves can be preliminarily screened out of the powder before falling to the screening plate 2, and then the screening is made more thorough by the criss-cross swinging of the screening plate 2.

[0030] See also Figure 2 and Figure 4 As shown, further, in order to improve the effect of cleaning the debris in the tea leaves, the debris can be fully screened out. The guide channel 19 is fixedly connected with shielding plates 25 on both sides perpendicular to the moving direction of the feeding trough 16. The side walls of the shielding plates 25 facing the screening box 1 are evenly provided with multiple rubber belts 26. The lower end of the rubber pad is fixedly connected with a material shifting block 27, and the shielding plates 25 are set as a cavity. The side of the shielding plates 25 away from the guide channel 19 is inserted with a covering plate 28, and the covering plate 28 is fixedly connected to the opening of the screening box 1, so that the cooperation of the shielding plates 25 and the covering plates 28 can cover the upper opening of the screening box 1 during the tea screening process to prevent the debris from floating in the air. The guide channel 19 is then used to drive the baffle plate 25 to swing, which can pull the rubber belt 26 to move. Under the action of the gravity of the material-moving block 27 at the bottom of the rubber belt 26, the tea leaves on the screening plate 2 are scattered during the movement of the screening plate 2, so that the tea leaves can be fully screened out.

[0031] See alsoFigures 1 to 8 As shown, according to the design of the tea powder screening device for selenium-rich tea processing, the screening method for tea includes the following steps: Pour the tea to be screened into the feeding trough 16. At the same time, start the current-limiting component 18, the driving component 3, and the blowing component 10 respectively.

[0032] Start the current-limiting component 18. Use the motor to provide power for the transmission shaft, so that the fan blades rotate according to the speed of the motor, and control the flow rate of the tea dropped downward.

[0033] Start the driving component 3. Use the rotary driver 31, the first incomplete gear 32, the first rack 33, and the first elastic structure 34 to cooperate to drive the movable frame 5 to perform a linear reciprocating motion. Use the reciprocating motion of the movable frame 5 to realize the linear reciprocating motion of the screening plate 2 in cooperation with the rotating rod 4, and realize the lateral swing of the screening plate 2; The reciprocating motion of the rotating rod 4 drives the reciprocating motion of the driven shaft 6. During the movement of the driven shaft 6, the spiral groove 9 on the driven shaft 6 is in limit cooperation with the limit post 8 on the inner wall of the limit sleeve 7 to realize the rotation of the driven shaft 6, and then indirectly realize the rotation of the screening plate 2. And use the reciprocating motion of the driven shaft 6 to realize the reciprocating rotation of the screening plate 2 with the axis of the rotating rod 4 as the rotation center, that is, realize the longitudinal swing of the screening plate 2; Start the blowing component 10. Use the blower 101 to provide wind power for the diversion channel 19 and the screening box 1 respectively under the cooperation of the main pipeline 104, the transmission hose 105, the branch pipeline 106, the shunt pipe 102, the first blowing pipe 103, and the second blowing pipe 107. Utilize the staggered air supply cavities 23 of the diversion channel 19 to blow the tea on both the left and right sides when the tea falls, so that the tea can be preliminarily screened for powder before falling onto the screening plate 2. By blowing air into the screening box 1 and contacting the screening plate 2 at different positions, the tea on the screening plate 2 can be further dispersed to achieve the full dispersion of the tea.

[0034] Utilize the lateral swing and longitudinal swing of the screening plate 2 to realize the criss-cross tumbling of the tea on the screening plate 2, fully tumble and disperse the tea accumulated in the upper and middle layers downward, so that the powder in the tea can more fully pass through the mesh on the screening plate 2 and fall to the bottom of the screening box 1. The complete tea leaves remain on the screening plate 2 and can be taken out after the screening is over. When extracting the better complete tea leaves, the screening can be turned to the horizontal position and pushed from one side to the other side by a pusher device, or the screening plate 2 can be quickly separated from the rotating rod 4 through the pin connection between the rotating rod 4 and the screening plate 2, remove the screening plate 2, and take out the tea leaves.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A tea powder screening device, comprising a screening box (1) and a screening plate (2) arranged inside the screening box (1), characterized in that, It further includes: A lateral swing module, including a driving component (3), a rotating rod (4), and a movable frame (5). The movable frame (5) is sleeved outside the screening box (1) and is slidably connected thereto. The movable frame (5) is connected to the output end of the driving component (3). The driving component (3) is installed on the screening box (1) and is used to drive the movable frame (5) to perform linear reciprocating motion. One end of the rotating rod (4) is detachably connected to the screening plate (2), and the other end is inserted through and rotatably connected to the movable frame (5). The screening plate (2) is symmetrically arranged about the axis of the rotating rod (4); A longitudinal rotation module, including a driven shaft (6), a limiting sleeve (7), and a limiting post (8). One end of the driven shaft (6) is fixed to the rotating rod (4) and they are coaxial. A spiral guide groove (9) is formed on the driven shaft (6). The limiting sleeve (7) is sleeved on the driven shaft (6). The limiting post (8) is fixedly connected to the inner wall of the limiting sleeve (7) and one end thereof slides in the spiral guide groove (9). The limiting sleeve (7) is fixedly connected to the side wall of the screening box (1). The driven shaft (6) realizes the longitudinal reciprocating rotation of the screening plate (2) through the cooperation of the spiral guide groove (9) and the limiting post (8) during the linear reciprocating motion process.

2. The tea powder screening device according to claim 1, characterized in that, On one side of the screening box (1), a blowing component (10) for blowing the tea leaves on the screening plate (2) is further provided. The blowing component (10) includes: A blower (101), installed on the screening box (1); A shunt pipe (102), communicated with the air outlet of the blower (101), and a plurality of air blowing ports are uniformly arranged on the shunt pipe (102); A plurality of first air blowing pipes (103), communicated with the plurality of air blowing ports one by one. The plurality of first air blowing pipes (103) are inserted through and arranged on the side wall of the screening box (1). The end of the first air blowing pipe (103) far from the shunt pipe (102) extends into the screening box (1) and faces the upper side of the screening plate (2).

3. The tea powder screening device according to claim 2, characterized in that, The plurality of first air blowing pipes (103) are all inclined, and the end of the first air blowing pipe (103) far from the shunt pipe (102) is the lower end of the inclined direction, and the inclination angles between the adjacent two first air blowing pipes (103) and the shunt pipe (102) are different.

4. A tea powder screening device according to claim 1, characterized in that, Extended screen plates (11) are respectively provided on both sides of the screen plate (2) parallel to the rotation direction thereof. The extended screen plate (11) is parallel to the screen plate (2), and the lower side wall of the extended screen plate (11) is in contact with the upper side wall of the screen plate (2). A convex strip (12) is fixedly connected to the lower side of one end of the extended screen plate (11) away from the screen plate (2). A plurality of movable rods (13) are evenly distributed on the side of the convex strip (12) facing the screen plate (2). The end of the movable rod (13) away from the convex strip (12) is inserted into a matching hole on the screen plate (2) and connected via an elastic member (14). A roller (15) is rotatably connected to the side of the convex strip (12) away from the screen plate (2), and the roller (15) is in contact with the side wall of the screen box (1) under the action of the elastic member (14).

5. The tea dust screening device according to claim 2, wherein, The drive assembly (3) comprises: A rotary driver (31) mounted on the outer side wall of the screening box (1) and having an output shaft; A first incomplete gear (32) sleeved and fixed on the output shaft; A first rack (33) fixedly connected to the movable frame (5) and meshing with the first incomplete gear (32); The first elastic structure (34) is arranged between the movable frame (5) and the side wall of the screening box (1).

6. The tea dust screening device according to claim 5, characterized in that, The upper side of the screening box (1) is provided with an opening, and a feeding trough (16) is mounted on the opening of the screening box (1). Both ends of the feeding trough (16) are slidably connected to the screening box (1), and the feeding trough (16) is connected to the output shaft via a transmission component (17). The transmission component (17) is used to realize reciprocating movement of the feeding trough (16) on the opening of the screening box (1) through the drive of the output shaft.

7. A tea powder screening device according to claim 6, wherein, A flow limiting component (18) is provided on the outlet side of the feeding trough (16) facing the screening box (1), and the flow limiting component (18) is used to adjust the unit flow rate of tea leaves in the feeding trough (16) to the screening box (1).

8. A tea powder screening device according to claim 6, characterized in that, A guide channel (19) is further provided between the outlet of the feeding trough (16) and the screening box (1), and opposite side walls of the guide channel (19) are both fixedly connected with a cavity shell (20), and the side walls between the cavity shell (20) and the guide channel (19) are provided with a screening net (21), and a partition (22) is provided in each of the cavity shells (20), and the partition (22) is used to separate the cavity shell (20) into an air supply chamber (23) and a slag collection chamber (24), and the air supply chambers (23) and slag collection chambers (24) on both sides are arranged alternately up and down, and the air supply chamber (23) is connected to the air outlet of the blower (101) through a plurality of second blowing pipes (107).

9. The tea powder screening device according to claim 8, characterized in that, The guide channel (19) is fixedly connected to shielding plates (25) on both sides perpendicular to the moving direction of the feeding trough (16); a plurality of rubber belts (26) are evenly arranged on the side walls of the shielding plates (25) facing the screening box (1); and a material shifting block (27) is fixedly connected to the lower end of the rubber pad.

10. A screening method for a tea powder screening device according to any one of claims 1-9, characterized in that, The following steps are involved: The starting drive assembly (3) drives the movable frame (5) to move linearly back and forth, and uses the reciprocating motion of the movable frame (5) to drive the reciprocating motion of the rotating rod (4), thereby realizing the linear reciprocating motion of the screening plate (2), that is, realizing the lateral swing of the screening plate (2). The rotating rod (4) drives the driven shaft (6) to move back and forth. During the reciprocating motion of the driven shaft (6), the spiral guide groove (9) on the driven shaft (6) realizes the rotation of the driven shaft (6) through the limiting cooperation with the limiting column (8) on the inner wall of the limiting sleeve (7), and then indirectly realizes the rotation of the screening plate (2). Moreover, the reciprocating motion of the driven shaft (6) realizes the reciprocating rotation of the screening plate (2) with the axis of the rotating rod (4) as the rotation center, that is, realizes the longitudinal swing of the screening plate (2). Uniformly put the tea leaves to be screened onto the screening plate (2), and use the lateral swing and longitudinal swing of the screening plate (2) to realize the crisscross tumbling of the tea leaves on the screening plate (2), fully tumbling and dispersing the tea leaves piled up in the upper and middle layers downward, so that the fine powder in the tea leaves can more fully pass through the mesh on the screening plate (2) and fall to the bottom of the screening box (1), and the whole tea leaves remain on the screening plate (2) and can be taken out after the screening is completed.

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