Secondary inner cutting tea leaf screening machine
By setting up a re-crushing mechanism and a negative pressure system inside the tea screening machine, the internal crushing and mixed output of tea leaves is realized, solving the problems of high cost and secondary pollution caused by external processing, and improving the utilization rate and screening efficiency of tea leaves.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHAOXING JIANMING TEA IND CO LTD
- Filing Date
- 2024-09-19
- Publication Date
- 2026-05-29
AI Technical Summary
Existing tea sorting equipment requires external crushing, which leads to high production costs and is prone to secondary pollution. Furthermore, the utilization rate of tea leaves during the sorting process is low.
Design a tea screening machine capable of secondary internal cutting. By setting a re-crushing mechanism in the same machine, the large-sized tea leaves screened by the first screen are cut into smaller pieces. The negative pressure setting of the third screen and the re-crushing mechanism are used to achieve internal cutting and mixed output of tea leaves, avoiding the input of external equipment and secondary pollution.
It reduces production costs, increases tea utilization, avoids secondary pollution from external tea processing, and improves chopping efficiency and tea quality through negative pressure and pulsed gas.
Smart Images
Figure CN118925886B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of screening machine technology, and in particular to a tea screening machine capable of secondary internal cutting. Background Technology
[0002] In the tea processing process, the varying ages of tea leaves and different processing techniques result in complex tea quality. To ensure consistent tea quality, tea screening is a crucial step in tea production and processing. Currently, the commonly used equipment for tea screening is the planar circular screen machine. This machine uses a transmission mechanism composed of a drive shaft and eccentric shaft to drive the machine body in a circular motion on a horizontal plane, generating vibrations that effectively screen the tea leaves on the screen surface, classifying them according to size, removing broken pieces, and improving tea quality. Existing screening machines consist of multiple screens arranged vertically, with the screen mesh size decreasing from top to bottom. The larger tea leaves screened by the upper screen need to be collected a second time and then processed into smaller sizes by an external crushing device. These smaller tea leaves are then fed back into the screening machine for further screening, requiring significant labor and equipment investment, thus increasing production costs. Furthermore, the larger tea leaves screened are prone to secondary contamination such as breakage and moisture during transfer and storage. Summary of the Invention
[0003] The purpose of this invention is to provide a tea screening machine capable of secondary internal cutting. Through a re-crushing mechanism, large-sized tea leaves screened by the first screen can be cut into smaller pieces and cut into smaller pieces. This can be done simultaneously inside the same machine, avoiding the additional manpower and equipment investment required for external cutting and thus reducing production costs.
[0004] The tea leaves that have been screened out through a third sieve and then crushed can be mixed with the tea leaves that have been screened out through a second sieve and then exported together. This can effectively improve the utilization rate of raw materials and avoid the problem of secondary pollution during the external processing of tea leaves.
[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:
[0006] A tea leaf screening machine capable of secondary internal cutting includes a screening box mounted on a vibrating device. A primary screen and a secondary screen are fixed inside the screening box, arranged vertically. A crushing hopper is located below the secondary screen. The primary and secondary screens are inclined and their lower ends are fixed to a vertical partition. The screening box is square, with the vertical partition fixed to the front, rear, and bottom walls of the screening box. A discharge port is formed in the middle of the vertical partition, located at the lower end where the secondary screen connects.
[0007] A third screen is provided on the opposite side of the vertical partition, and the side of the third screen away from the vertical partition is under negative pressure; the third screen, the primary screen and the secondary screen are fixed on the front and rear side walls of the screening box.
[0008] A re-shredding mechanism is provided between the vertical screen and the vertical partition;
[0009] The top plate of the screening box is equipped with a feed inlet, which is located above the high end of the primary screen.
[0010] Through the above technical solution, the vibration device drives the entire screening box and the components fixed inside the screening box to vibrate.
[0011] The tea leaves to be screened are fed into the high end of the primary screen through the feed inlet. Through the vibration of the vibrating device, the tea leaves on the primary screen are gradually dispersed and moved to the lower end. The primary screen screens the tea leaves, and most of the tea leaves fall down into the secondary screen. After being screened by the secondary screen, the tea leaves of relatively suitable size fall onto the secondary screen and are output to the lower end of the secondary screen; while smaller tea leaves and fragments pass through the secondary screen and enter the crushing hopper for collection.
[0012] After being screened once, larger tea leaves flow along the lower end of the primary screen and enter between the vertical screen and the vertical partition. The chopping mechanism then further chops the larger tea leaves. The smaller tea leaves, after being chopped, pass through the third screen and enter the other side of the third screen. Through the negative pressure setting, the larger tea leaves before crushing are adsorbed on the third screen, making it easier for the chopping mechanism to cut the larger tea leaves into smaller pieces. At the same time, the negative pressure setting can speed up the passage of the chopped tea leaves through the third screen, thus cutting the larger tea leaves into the required size, improving the utilization rate of the tea leaves, and eliminating the need for secondary processing of the larger tea leaves through external chopping equipment.
[0013] The present invention is further configured such that: the re-shredding mechanism includes a lower stop block fixed between the third screen and the vertical partition; the lower stop block, the screening box, the third screen and the vertical partition form a secondary processing chamber; the upper end of one side of the secondary processing chamber is connected to the primary screen;
[0014] The secondary processing chamber is equipped with an internal cutting base shaft that can be raised, lowered, and rotated. Multiple circumferentially distributed folding strips are provided on the outer side of the internal cutting base shaft. Each folding strip is fixedly connected to the crushing base shaft through multiple radial cutting rods.
[0015] The lower stop block can block large-sized tea leaves. The lifting and rotation of the inner cutting base shaft drives the folding bar and radial rod to lift and rotate simultaneously. The folding bar can flip up or break the large-sized tea leaves adsorbed on the third screen, and the radial blade rod can cut the large-sized tea leaves into smaller pieces.
[0016] The present invention is further configured such that: an axial cutting rod is fixed on the radial cutting rod and is arranged perpendicular to it;
[0017] The radial and axial cutting rods have prismatic cross-sections.
[0018] The axial and radial cutting rods can cut and reduce the size of large tea leaves in multiple directions, improving the efficiency of secondary chopping.
[0019] The present invention is further configured such that the cross-section of the folding strip is semi-circular;
[0020] The distance L1 between the outer arc surface of the folding strip and the center line of the crushing base shaft is equal to the distance L2 between the third screen and the center line of the crushing base shaft. This ensures that the folding strip can fit against the third screen during rotation and lifting. However, the folding strip contacts the third screen with its arc surface, which reduces damage to the third screen.
[0021] The present invention is further configured such that: the middle part of the internal tangent base shaft is rotatably connected to the lifting seat, and the lifting seat is rotatably connected to the rotating shaft A and the rotating shaft B; the large gear A and the small gear A are fixed on the rotating shaft A, and the large gear B and the small gear B are fixed on the rotating shaft B;
[0022] The pinion A meshes with a vertically arranged rack, which is fixed to a vertical partition.
[0023] The large gear A meshes with the small gear B;
[0024] The large gear B meshes with gear C, and gear C is fixed in the middle of the inner tangent base shaft;
[0025] The lifting seat is screwed onto a vertically arranged screw rod. The lower end of the screw rod is rotatably connected to a support, and the upper end of the screw rod is rotatably connected to the top plate of the screening box. A motor that drives the screw rod to rotate is fixed on the screening box, and the motor is electrically connected to a controller.
[0026] The two ends of the inner tangent base shaft are rotatably connected to square sliders via bearings. The square sliders are inserted between two parallel limiting strips, which are fixed to the inner wall of the screening box.
[0027] Through the above technical solution, the motor drives the screw to rotate in the forward or reverse direction, and the rotation of the screw can drive the lifting seat to move up or down.
[0028] When the lifting seat is raised or lowered, it can drive the inner tangent base shaft to rise and fall synchronously. At the same time, when the lifting seat moves, the small gear A rotates through the action of the rack and pinion. The small gear A drives the large gear A to rotate through the rotating shaft A. The large gear A drives the small gear B to rotate. The small gear B drives the large gear B to rotate through the rotating shaft B. The large gear B drives the inner tangent base shaft to rotate through the gear C. The inner tangent base shaft drives the radial cutting rod, the axial cutting rod and the folding bar to rotate.
[0029] The acceleration effect of the gear pair allows the inner cutting base shaft to rotate rapidly while rising and falling at a low speed, thereby further improving the chopping effect.
[0030] The present invention is further configured such that: a folding plate is provided below the lower stop block, and the folding plate, the vertical partition plate, the lower stop block and the lower end of the third screen form a high-pressure air chamber; the high-pressure air chamber is connected to a high-pressure air pipe, the high-pressure air pipe is connected to a high-pressure air source, and a pulse device is provided on the high-pressure air pipe;
[0031] The lower stop block has several air holes formed on it, which connect the high-pressure air chamber and the secondary processing chamber.
[0032] High-pressure gas can be supplied to the high-pressure air chamber through a high-pressure air source and high-pressure air pipe. The high-pressure gas enters the secondary processing chamber through the air hole, which can blow away and move the tea leaves in the secondary processing chamber quickly. In addition, with the action of the radial blade and the axial blade, the crushing efficiency can be further improved, and the accumulation of tea leaves in the secondary processing chamber can also be prevented.
[0033] By setting up a pulse device, air can be blown intermittently, since the amount of tea in the secondary processing chamber is not very large, and the negative pressure on the other side of the third screen can also be reduced.
[0034] The present invention is further configured such that: a partition plate and a guide plate are fixed between the third screen and the inner wall of the screening box, and the third screen, the inner wall of the screening box, the partition plate and the guide plate form a negative pressure chamber; the partition plate is provided with an exhaust pipe;
[0035] The lower end of the material guide plate is connected to the discharge channel; the upper end of the discharge channel is connected to the lower end of the secondary screen, and the lower end of the discharge channel extends out of the screening box.
[0036] The negative pressure chamber provides negative pressure adsorption to the third screen. After the tea leaves are cut into smaller pieces, they enter the negative pressure chamber through the third screen. Then, the tea leaves move downwards under their own gravity and enter the discharge channel through the guide plate. The tea leaves that have been screened by the second screen also enter the discharge channel through the discharge port. The tea leaves in the discharge channel are of relatively moderate size and meet the required specifications.
[0037] The present invention is further configured such that: an outer shell is provided on the outside of the screening box, and the outer shell and the outer wall of the screening box form a negative pressure chamber;
[0038] The exhaust pipe is connected to the negative pressure chamber; the top plate of the screening box is provided with an exhaust port that communicates with the negative pressure chamber, and the exhaust port is connected to an exhaust fan.
[0039] The front and rear side walls of the screening box are formed with a number of dust suction holes that communicate with the negative pressure chamber. The dust suction holes are located between the primary screen and the secondary screen.
[0040] By drawing air out of the negative pressure chamber using an exhaust fan, the air pressure inside the chamber is lower than atmospheric pressure. The dust and debris generated by the primary and secondary sieves can be absorbed through the dust suction holes, which can improve the quality of the tea leaves after screening and reduce the adhesion of dust to the tea leaves.
[0041] The negative pressure chamber draws air out of the negative pressure chamber through an exhaust pipe, thereby reducing the air pressure inside the negative pressure chamber to atmospheric pressure.
[0042] The present invention is further configured such that the mesh sizes of the secondary screen and the third screen are equal, so that the size of the tea leaves after screening by the secondary screen and the size of the tea leaves after screening by the third screen are similar, thereby satisfying the requirements for mixed output.
[0043] The outstanding effects of this invention are:
[0044] Compared with existing technologies, the re-crushing mechanism can perform secondary cutting and slitting of large-sized tea leaves screened by the first screen. This can be done simultaneously inside the same machine, avoiding the additional manpower and equipment investment required for external crushing, thereby reducing production costs.
[0045] The tea leaves that have been screened out through the third screen and then crushed can be mixed with the tea leaves that have been screened out through the second screen and then exported together. This can effectively improve the utilization rate of raw materials and avoid the problem of secondary pollution during the external processing of tea leaves.
[0046] The negative pressure setting on the side of the third screen facilitates the screening of tea leaves after they have been cut into smaller pieces.
[0047] Tea leaves can be cut into smaller or smaller pieces at multiple angles using radial and axial cutting rods.
[0048] By applying intermittent pulsed air to the secondary processing chamber, the tea leaves inside can be more dispersed, further improving the cutting and slicing effect. Attached Figure Description
[0049] Figure 1 This is a schematic diagram of the structure of the present invention;
[0050] Figure 1 Medium-thick solid arrows are used to indicate the flow of large-sized tea leaves, thin solid arrows are used to indicate the flow of medium-sized (i.e., needed) tea leaves, and dashed arrows are used to indicate the flow of smaller-sized tea leaves and tea dust.
[0051] Figure 2 for Figure 1 A sectional view of AA;
[0052] Figure 3 for Figure 1 A magnified view of a portion of B;
[0053] Figure 4 for Figure 3 A magnified view of a portion of C;
[0054] Figure 5 for Figure 2 A magnified view of a portion of D;
[0055] Figure 6 for Figure 3 A sectional view of EE;
[0056] Figure 7 This is a schematic diagram of the assembly of the incisional base shaft, folding bar, radial cutting bar, and axial cutting bar of the present invention.
[0057] Attached reference numerals: 10. Screening box; 11. Vertical partition; 12. Material guide plate; 13. Compartment plate; 14. Exhaust pipe; 15. Discharge channel; 16. Outer shell; 17. Negative pressure chamber; 18. Exhaust port; 19. Inlet.
[0058] 100. Negative pressure chamber; 101. Dust suction port; 111. Discharge port;
[0059] 20. First-pass screening;
[0060] 30. Secondary sieve;
[0061] 40. Third screen; 41. Divider plate;
[0062] 50. Re-shredding mechanism; 500. Secondary processing chamber; 501. Lower stop block; 502. Internal cutting base shaft; 503. Folding bar; 504. Radial cutting rod; 505. Axial cutting rod; 506. Lifting seat; 507. Rotating shaft A; 508. Rotating shaft B; 509. Large gear A; 510. Small gear A; 511. Large gear B; 512. Small gear B; 513. Rack; 514. Gear C; 515. Screw; 516. Support; 517. Square slider; 518. Limiting bar; 519. Folding plate; 520. High-pressure air chamber; 521. High-pressure air pipe; 522. Air hole;
[0063] 60. Crushing hopper. Detailed Implementation
[0064] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0065] The following is for reference Figures 1 to 7 The present invention will be described as follows:
[0066] A type of tea leaf screening machine capable of secondary internal cutting, such as Figure 1-2As shown, the system includes a screening box 10 mounted on a vibrating device. A primary screen 20 and a secondary screen 30 are fixed inside the screening box 10, arranged vertically. A crushing hopper 60 is located below the secondary screen 30. The primary screen 20 and the secondary screen 30 are inclined and their lower ends are fixed to a vertical partition 11. The screening box 10 is a square box, and the vertical partition 11 is fixed to the front side wall, rear side wall, and bottom surface of the screening box 10. A discharge port 111 is formed in the middle of the vertical partition 11, located at the lower end connecting to the secondary screen 30.
[0067] A third screen 40 is provided on the opposite side of the vertical partition 11, and the side of the third screen 40 away from the vertical partition 11 is subjected to negative pressure; the third screen 40, the primary screen 20 and the secondary screen 30 are fixed on the front and rear side walls of the screening box 10.
[0068] A re-shredding mechanism 50 is provided between the vertical screen 40 and the vertical partition 11;
[0069] The top plate of the screening box is provided with a feed inlet 19, which is located above the high end of the primary screen.
[0070] The vibration device drives the entire screening box and the components fixed inside the screening box to vibrate;
[0071] The tea leaves to be screened are fed into the high end of the primary screen through the feed inlet. Through the vibration of the vibrating device, the tea leaves on the primary screen are gradually dispersed and moved to the lower end. The primary screen screens the tea leaves, and most of the tea leaves fall down into the secondary screen. After being screened by the secondary screen, the tea leaves of relatively suitable size fall onto the secondary screen and are output to the lower end of the secondary screen; while smaller tea leaves and fragments pass through the secondary screen and enter the crushing hopper for collection.
[0072] After being screened by the first screen, larger tea leaves flow along the lower end of the first screen and enter between the vertical screen 40 and the vertical partition 11. The chopping mechanism then further chops the larger tea leaves. The tea leaves of relatively suitable size after chopping then pass through the third screen and enter the other side of the third screen. Through the negative pressure setting, the larger tea leaves before crushing can be adsorbed on the third screen, which facilitates the chopping mechanism to chop the larger tea leaves into smaller pieces. At the same time, the negative pressure setting can speed up the passage of the chopped tea leaves through the third screen, thereby reducing the size of the large tea leaves to the required size, improving the utilization rate of the tea leaves, and eliminating the need for secondary processing of the large tea leaves through external chopping equipment.
[0073] like Figure 3-7As shown, the re-shredding mechanism 50 includes a lower stop block 501 fixed between the third screen 40 and the vertical partition 11. The lower stop block 501, the screening box 10, the third screen 40 and the vertical partition 11 form a secondary processing chamber 500. The upper end of one side of the secondary processing chamber 500 is connected to the primary screen 20.
[0074] The secondary processing chamber 500 is equipped with an internal cutting base shaft 502 that can be raised, lowered and rotated. Multiple circumferentially distributed folding strips 503 are provided on the outer side of the internal cutting base shaft 502. Each folding strip 503 is fixedly connected to the crushing base shaft 502 through multiple radial cutting rods 504.
[0075] The lower stop block can block large-sized tea leaves. The lifting and rotation of the inner cutting base shaft drives the folding bar and radial rod to lift and rotate simultaneously. The folding bar can flip up or break the large-sized tea leaves adsorbed on the third screen, and the radial blade rod can cut the large-sized tea leaves into smaller pieces.
[0076] An axial cutting rod 505 is fixed on the radial cutting rod 504 and is arranged perpendicularly to it.
[0077] The radial cutting rod 504 and the axial cutting rod 505 have prismatic cross-sections.
[0078] The axial and radial cutting rods can cut and reduce the size of large tea leaves in multiple directions, improving the efficiency of secondary chopping.
[0079] The cross-section of the folding strip 503 is semi-circular;
[0080] The distance L1 between the outer arc surface of the folding strip 503 and the center line of the crushing base shaft 502 is equal to the distance L2 between the third screen 40 and the center line of the crushing base shaft 502. This ensures that the folding strip can fit against the third screen during rotation and lifting. However, the folding strip contacts the third screen with its arc surface, which reduces damage to the third screen.
[0081] The middle part of the inner tangent base shaft 502 is rotatably connected to the lifting seat 506. The lifting seat 506 is rotatably connected to the rotating shaft A507 and the rotating shaft B508. The large gear A509 and the small gear A510 are fixed on the rotating shaft A507, and the large gear B511 and the small gear B512 are fixed on the rotating shaft B508.
[0082] The pinion A510 meshes with a vertically arranged rack 513, which is fixed on the vertical partition 11.
[0083] The large gear A509 meshes with the small gear B512;
[0084] The large gear B511 meshes with gear C514, and gear C514 is fixed in the middle of the inner tangent base shaft 502;
[0085] The lifting seat 506 is screwed onto the vertically arranged screw 515. The lower end of the screw 515 is rotatably connected to the support 516, and the upper end of the screw 515 is rotatably connected to the top plate of the screening box 10. The screening box 10 is fixed with a motor 516 that drives the screw 515 to rotate, and the motor 516 is electrically connected to a controller.
[0086] The two ends of the inscribed base shaft 502 are rotatably connected to square sliders 517 via bearings. The square sliders 517 are inserted between two parallel limiting strips 518, and the limiting strips 518 are fixed on the inner wall of the screening box 10.
[0087] The motor drives the screw to rotate in the forward or reverse direction, and the rotation of the screw can drive the lifting seat to move up or down.
[0088] When the lifting seat is raised or lowered, it can drive the inner tangent base shaft to rise and fall synchronously. At the same time, when the lifting seat moves, the pinion A rotates through the rack and pinion, and the pinion A drives the large gear A to rotate through the rotating shaft A. The large gear A drives the pinion B to rotate, and the pinion B drives the large gear B to rotate through the rotating shaft B. The large gear B drives the inner tangent base shaft to rotate through the gear C. The inner tangent base shaft drives the radial cutting rod 504, the axial cutting rod 505 and the folding bar to rotate.
[0089] The acceleration effect of the gear pair allows the inner cutting base shaft to rotate rapidly while rising and falling at a low speed, thereby further improving the chopping effect.
[0090] Below the lower stop block 501, there is a folding plate 519. The folding plate 519, the vertical partition 11, the lower stop block 501 and the lower end of the third screen 40 form a high-pressure air chamber 520. The high-pressure air chamber 520 is connected to a high-pressure air pipe 521, which is connected to a high-pressure air source. A pulse device is provided on the high-pressure air pipe 521.
[0091] The lower stop block 501 has several air holes 522 formed on it, which connect the high-pressure air chamber 520 and the secondary processing chamber 500.
[0092] High-pressure gas can be supplied to the high-pressure air chamber through the high-pressure air source and high-pressure air pipe. The high-pressure gas enters the secondary processing chamber through the air hole, which can blow away and move the tea leaves in the secondary processing chamber quickly. In addition, with the action of the radial blade 504 and the axial blade 505, the crushing efficiency can be further improved, and the accumulation of tea leaves in the secondary processing chamber can also be prevented.
[0093] By setting up a pulse device, air can be blown intermittently, since the amount of tea in the secondary processing chamber is not very large, and the negative pressure on the other side of the third screen can also be reduced.
[0094] A partition plate 41 and a guide plate 12 are fixed between the third screen 40 and the inner wall of the screening box 10. The third screen 40, the inner wall of the screening box 10, the partition plate 13 and the guide plate 12 form a negative pressure chamber 100. The partition plate 13 is provided with an exhaust pipe 14.
[0095] The lower end of the guide plate 12 is connected to the discharge channel 15; the upper end of the discharge channel 15 is connected to the lower end of the secondary screen 30, and the lower end of the discharge channel 15 extends out of the screening box 10.
[0096] The negative pressure chamber provides negative pressure adsorption to the third screen. After the tea leaves are cut into smaller pieces, they enter the negative pressure chamber through the third screen. Then, the tea leaves move downwards under their own gravity and enter the discharge channel through the guide plate. The tea leaves that have been screened by the second screen also enter the discharge channel through the discharge port. The tea leaves in the discharge channel are of relatively moderate size and meet the required specifications.
[0097] The outer side of the screening box 10 is provided with an outer shell 16, and the outer shell 16 and the outer wall of the screening box 10 form a negative pressure chamber 17.
[0098] The exhaust pipe 14 is connected to the negative pressure chamber 17; the top plate of the screening box 10 is provided with an exhaust port 18 that is connected to the negative pressure chamber 17, and the exhaust port 18 is connected to an exhaust fan.
[0099] The front and rear side walls of the screening box 10 are formed with a plurality of dust suction holes 101 communicating with the negative pressure chamber 17. The dust suction holes 101 are located between the primary screen 20 and the secondary screen 30.
[0100] By drawing air out of the negative pressure chamber using an exhaust fan, the air pressure inside the chamber is lower than atmospheric pressure. The dust and debris generated by the primary and secondary sieves can be absorbed through the dust suction holes, which can improve the quality of the tea leaves after screening and reduce the adhesion of dust to the tea leaves.
[0101] The negative pressure chamber draws air out of the negative pressure chamber through an exhaust pipe, thereby reducing the air pressure inside the negative pressure chamber to atmospheric pressure.
[0102] The secondary screen 30 and the third screen 40 have the same screen size, so that the size of the tea leaves after screening by the secondary screen and the size of the tea leaves after screening by the third screen are suitable, thus meeting the requirements for mixed output.
[0103] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications assumed above should also be considered within the scope of protection of the present invention.
Claims
1. A tea leaf screening machine capable of secondary internal cutting, comprising a screening box (10) mounted on a vibrating device, wherein a primary screen (20) and a secondary screen (30) are fixedly arranged vertically within the screening box (10); characterized in that: The primary screen (20) and the secondary screen (30) are inclined and their lower ends are fixed on the vertical partition (11); a third screen (40) is provided on the opposite side of the vertical partition (11), and the third screen (40) is negatively pressure set on the side away from the vertical partition (11); A re-shredding mechanism (50) is provided between the third screen (40) and the vertical partition (11); The re-shredding mechanism (50) includes a lower stop (501) fixed between the third screen (40) and the vertical partition (11). The lower stop (501), the screening box (10), the third screen (40) and the vertical partition (11) form a secondary processing chamber (500). The upper end of one side of the secondary processing chamber (500) is connected to the primary screen (20). The secondary processing chamber (500) is equipped with an internally tangent base shaft (502) that can be raised, lowered, and rotated. Multiple circumferentially distributed folding strips (503) are provided on the outer side of the internally tangent base shaft (502). Each folding strip (503) is fixedly connected to the internally tangent base shaft (502) through multiple radial cutting rods (504). An axial cutting rod (505) is fixed on the radial cutting rod (504) and is perpendicular to it. The cross-section of the folding strip (503) is semi-circular, and the distance L1 between the outer arc surface of the folding strip (503) and the center line of the internally tangent base shaft (502) is equal to the distance L2 between the third screen (40) and the center line of the internally tangent base shaft (502). The middle part of the inner tangent base shaft (502) is rotatably connected to the lifting seat (506), and the lifting seat (506) is rotatably connected to the rotating shaft A (507) and the rotating shaft B (508); the rotating shaft A (507) is fixed with a large gear A (509) and a small gear A (510), and the rotating shaft B (508) is fixed with a large gear B (511) and a small gear B (512); the small gear A (510) meshes with a vertically arranged rack (513), and the rack (513) is fixed on a vertical partition (11); the large gear A (509) meshes with the small gear B (512); the large gear B (511) meshes with a gear C (514), and the gear C (514) is fixed in the middle part of the inner tangent base shaft (502); the lifting seat (506) is screwed onto a vertically arranged screw rod (515); The screening box (10) is fixed with a motor that drives the screw (515) to rotate; the two ends of the inner tangent base shaft (502) are rotatably connected to square sliders (517) through bearings, and the square sliders (517) are inserted between two parallel limit strips (518); the third screen (40) and the inner wall of the screening box (10) are fixed with a partition plate (41) and a guide plate (12), and the third screen (40), the inner wall of the screening box (10), the partition plate (13) and the guide plate (12) form a negative pressure chamber (100); the partition plate (13) is provided with an exhaust pipe (14); the lower end of the guide plate (12) is connected to the discharge channel (15); the upper end of the discharge channel (15) is connected to the lower end of the secondary screen (30), and the lower end of the discharge channel (15) extends out of the screening box (10).
2. The tea leaf screening machine capable of secondary internal cutting according to claim 1, characterized in that: The lower stop (501) is provided with a folding plate (519), and the lower ends of the folding plate (519), the vertical partition (11), the lower stop (501) and the third screen (40) form a high-pressure air chamber (520); the lower stop (501) is formed with a number of air holes (522) that connect the high-pressure air chamber (520) and the secondary processing chamber (500).
3. The tea leaf screening machine capable of secondary internal cutting according to claim 1, characterized in that: The outer side of the screening box (10) is provided with an outer shell (16), and the outer shell (16) and the outer wall of the screening box (10) form a negative pressure chamber (17); the exhaust pipe (14) is connected to the negative pressure chamber (17); the top plate of the screening box (10) is provided with an exhaust port (18) connected to the negative pressure chamber (17); the front and rear side walls of the screening box (10) are formed with a plurality of dust suction holes (101) connected to the negative pressure chamber (17), and the dust suction holes (101) are located between the primary screen (20) and the secondary screen (30).
4. The tea leaf screening machine capable of secondary internal cutting according to claim 1, characterized in that: The sieve holes of the secondary sieve (30) and the third sieve (40) are set to be of equal size.