Screening device and screening process for preparing rose black tea

Abstract

The present invention relates to the technical field of tea preparation and screening, and discloses a screening device for preparing rose black tea and a screening process thereof, comprising a base, a screen cylinder, a cleaning cylinder and a driving assembly; the screen cylinder and the cleaning cylinder are installed side by side on the base, a negative pressure feeding pipe is provided on the top of the screen cylinder, a powder collecting box is built-in at the bottom, and a screening motor and a reversing motor are respectively installed on the side walls; a blower is provided on the top of the cleaning cylinder, and a debris collecting bucket and a debris collecting box are provided at the bottom in sequence; a fixed shaft which can be raised and lowered is provided on the driving assembly, and the present invention simulates the shaking of an artificial screen plate, which is characterized by low frequency and high amplitude, so that the raw materials can jump and rotate forward in a parabolic manner on the filter plate, and this screening method has less impact force on the petals than the violent impact and friction of a high-frequency vibrating screen, and can greatly reduce the risk of breakage caused by repeated collisions, and at the same time simulates artificial shaking to keep the material in a loose jumping state, and the sliding friction contact time between the petals and between the petals and the screen is short, and it is not easy to be broken by squeezing or scraping.

Description

Technical Field

[0001] The invention relates to the technical field of tea preparation and screening, in particular to a screening device for preparing rose black tea and a screening process thereof. Background Art

[0002] During the rose tea production process, qualified raw materials are screened and packaged in individual small packages. This small packaging format not only facilitates quantitative extraction and precise proportioning of raw materials, but more importantly, it facilitates storage and management during subsequent preparation steps, ensuring that the raw materials remain fresh, pure, and easy to handle when needed.

[0003] Currently, the mechanical vibration and friction during the operation of screening equipment can easily lead to excessive crushing of dried rose petals, resulting in a large amount of unintended fine powder, which not only causes loss of target material but also increases the burden of handling the undersize material.

[0004] In addition, the screen has the problem of easy clogging and many sanitary dead corners, which not only affects production efficiency and continuity, but also increases the risk of cross-contamination and microbial growth, making it difficult to meet the stringent requirements of modern food processing for high cleanliness and safety. Summary of the Invention

[0005] The object of the present invention is to provide a screening device for preparing rose black tea and a screening process thereof, aiming to solve the problems in the prior art.

[0006] The present invention is achieved as follows: a screening device for preparing rose black tea, comprising a base, a screen cylinder, a cleaning cylinder and a drive assembly;

[0007] The sieve drum and the cleaning drum are installed side by side on the base. A negative pressure feed pipe is provided on the top of the sieve drum, a powder collecting box is built into the bottom, and a screening motor and a reversing motor are installed on the side walls respectively.

[0008] There is a blower on the top of the cleaning cylinder, and a debris collecting hopper and a debris collecting box at the bottom.

[0009] The driving assembly is provided with a fixed shaft that can be raised and lowered, and a number of sieve plates are sleeved on the fixed shaft. The sieve plates are driven by a reversing motor to rotate around the fixed shaft and can switch between the sieve drum and the cleaning drum. The sieve plates spin themselves during the switching process through the reversing gears.

[0010] The sieve plate is connected to the rotating ring through a bearing, and the rotating ring is driven to rotate by the screening motor; a pair of arc-shaped slides are symmetrically arranged inside the rotating ring, and an arc-shaped slide rod is fixed between the two arc-shaped slides. The connecting ring is slidably sleeved on the arc-shaped slide rod and the bottom is fixed to the filter plate through a buckle. A force spring is sleeved on the arc-shaped slide rod, and the two ends of the force spring respectively abut against the arc-shaped slide and the connecting ring;

[0011] A top ring is fixed on the sieve plate, and several right-angled triangular top pieces are evenly distributed along the circumference at the bottom of the top ring; when the rotating ring rotates, the top pieces press down and release the connecting rings in turn, driving the filter plate to produce asymmetric reciprocating shaking along the arc-shaped slide rod trajectory.

[0012] Preferably, ears with balls are provided on both sides of the connecting ring, the ears are slidably sleeved on the arc-shaped sliding rod, and the balls are in contact with the top plate.

[0013] Preferably, the number of right-angled triangular top pieces at the bottom of the top ring is odd;

[0014] The oblique edges of each top sheet are used for gradually pressing down the connecting ring, and the right-angled edges are used for instantaneously releasing the connecting ring.

[0015] Preferably, an elastic screen is adhered to the inner wall of the top ring, an annular slide groove is provided on the top of the rotating ring, and the lower end of the elastic screen is slidably connected to the annular slide groove through a slider.

[0016] Preferably, one side of the sieve plate is connected to the sleeve via a rotating shaft, which is connected to the fixed shaft via a sleeve bearing, and a tooth groove is provided on the outer side of the sleeve;

[0017] The output shaft of the reversing motor is fixedly connected to the driving gear, and the driving gear is meshed with the tooth groove of the sleeve;

[0018] The outer side of the rotating shaft is fixedly connected to the reversing helical gear, and the side wall of the screen drum is provided with a reversing tooth plate, and the tooth groove of the reversing tooth plate is meshed with the reversing helical gear.

[0019] Preferably, the driving assembly includes a lifting motor, a lead screw and a connecting frame;

[0020] The lifting motor drives the lead screw to rotate, the connecting frame is sleeved with the lead screw through the threaded hole, and the fixed shaft is fixed to the connecting frame;

[0021] The upper end portion of the fixed shaft is provided with a bracket extending to the interior of the sieve drum, and the end portion of the bracket is used for fixing one end of the negative pressure feed pipe inside the sieve drum.

[0022] Preferably, the output shaft of the screening motor is connected to a driving gear shaft, and the outer side of the rotating ring is provided with a tooth groove that meshes with the gear teeth on the surface of the driving gear shaft.

[0023] Preferably, the sieve cylinder and the cleaning cylinder are provided with a through groove on the adjacent side wall, and a wind shield is provided on the side of the cleaning cylinder;

[0024] The windshield is provided with a return spring and a telescopic rod, and the end of the telescopic rod is connected to the baffle;

[0025] The top of the sleeve is fixedly contacted with a triggering top block, which has a chamfered corner and is used to push the blocking piece to open the through slot.

[0026] Preferably, a collecting hopper is further provided on the outside of the cleaning cylinder, and a feeder is installed on the base below the collecting hopper, with the feed end of the feeder facing the discharge port of the collecting hopper.

[0027] A rose black tea preparation and screening process, applied to the above-mentioned rose black tea preparation and screening device, comprises the following steps:

[0028] S1. According to the specifications of the rose petals and black tea to be screened, the reversing motor is used to drive the sieve discs to rotate around the fixed axis in sequence, and the lifting motor is used to drive the sieve discs with different mesh specifications into the interior of the sieve drum;

[0029] S2. Rose petals and black tea are sucked into the filter disc in the sieve drum through the negative pressure feed pipe. The screening motor is started to drive the rotating ring to rotate, so that the right-angled triangle top plate at the bottom of the top ring periodically presses down the connecting ring.

[0030] The connecting ring produces asymmetrical reciprocating vibration along the arc-shaped slide bar trajectory, driving the filter disc to sprinkle materials;

[0031] Rose petals and black tea of ​​different sizes are screened layer by layer and retained, and impurities such as mud and sand are collected into the powder collection box;

[0032] S3. After the screening is completed, the reversing motor drives the sieve plate to rotate around the fixed axis in sequence. In the process of moving to the cleaning cylinder, the reversing gear engages the reversing bevel gear on the top of the sleeve, forcing the sieve plate to rotate 180 degrees. The rose petals and black tea screened and retained on the sieve plate are put into the collecting hopper and transported to the packaging line through the conveyor below the collecting hopper.

[0033] S4. After the sieve plate enters the cleaning cylinder: the blower sprays high-speed airflow to the bottom of the filter plate, and the impurities blocked in the filter plate screen fall into the collection box after passing through the collection bucket;

[0034] S5. The cleaned sieve plate is moved back to the sieve drum station, and the negative pressure feed pipe sucks in the next batch of raw materials for a cyclic operation.

[0035] The present invention discloses a screening device for preparing rose black tea and a screening process thereof, which have the following beneficial effects:

[0036] 1. The present invention simulates the shaking of the artificial sieve plate, which is characterized by low frequency and high amplitude, so that the raw materials can jump and rotate on the filter plate in a parabolic motion. Compared with the violent impact and friction of high-frequency vibrating screens, this screening method has less impact on the petals, which can greatly reduce the risk of breakage caused by repeated collisions. At the same time, the simulated artificial shaking keeps the material in a loose and jumping state. The sliding friction contact time between the petals and between the petals and the screen is short, and it is not easy to be broken by squeezing or scraping.

[0037] 2. While unloading the material through the self-selected sieve plate, the blower is used to flush the sieve holes with backwash airflow, which can effectively avoid the sieve holes from being blocked. During the cleaning of a single sieve plate, the other sieve plates can still participate in the screening operation, avoiding shutdown for cleaning and improving preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of a screening device for preparing rose black tea provided by an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the internal structure of a screening device for preparing rose black tea provided by an embodiment of the present invention;

[0040] Figure 3 This is a partial structural diagram of a screening device for preparing rose black tea provided by an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of a driving assembly of a screening device for preparing rose black tea provided by an embodiment of the present invention;

[0042] Figure 5 This is a partial structural diagram of a sieve tray of a screening device for preparing rose black tea provided in an embodiment of the present invention;

[0043] Figure 6 The present invention provides a screening device for preparing rose black tea. Figure 5 Schematic diagram of explosion structure;

[0044] Figure 7 The present invention is a schematic diagram of the cross-sectional structure of a windshield component of a screening device for preparing rose black tea provided by an embodiment of the present invention.

[0045] Marking Description:

[0046] 1. Base; 2. Screen drum; 3. Cleaning drum; 4. Feeder; 5. Drive assembly; 6. Screen plate;

[0047] 21. Negative pressure feed pipe; 22. Screening motor; 23. Reversing motor; 24. Reversing gear; 25. Powder collection box;

[0048] 221, driving gear shaft;

[0049] 31. Blower; 32. Collecting hopper; 33. Collecting box; 34. Wind shield; 35. Collecting hopper;

[0050] 341. Return spring; 342. Telescopic rod; 343. Blocking piece;

[0051] 51. Lifting motor; 52. Connecting frame; 53. Fixed axis; 54. Bracket;

[0052] 511, screw;

[0053] 61. Sleeve; 62. Swivel; 63. Top ring; 64. Connecting ring; 65. Filter plate; 66. Elastic curtain;

[0054] 611, rotating shaft; 612, trigger top block; 621, arc-shaped slide; 622, arc-shaped slide rod; 623, force spring; 631, top plate; 641, ear plate; 642, buckle. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, 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 intended to limit the present invention.

[0056] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0057] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0058] In this embodiment:

[0059] Reference Figure 1-Figure 3 As shown, a preferred embodiment of the present invention is provided.

[0060] The present embodiment provides a screening device for preparing rose black tea, comprising a base 1, a screening cylinder 2, a cleaning cylinder 3, and a driving assembly 5;

[0061] The sieve drum 2 and the cleaning drum 3 are installed side by side on the base 1. A negative pressure feed pipe 21 is provided on the top of the sieve drum 2, a powder collecting box 25 is built into the bottom, and a screening motor 22 and a reversing motor 23 are installed on the side walls respectively.

[0062] The top of the cleaning cylinder 3 is provided with a blower 31, and the bottom is provided with a debris collecting bucket 32 ​​and a debris collecting box 33 in sequence;

[0063] The driving assembly 5 is provided with a liftable fixed shaft 53, on which a number of sieve plates 6 are sleeved. The sieve plates 6 are driven to rotate around the fixed shaft 53 by the reversing motor 23 and can switch between the sieve drum 2 and the cleaning drum 3. The sieve plates 6 spin by the reversing gear pieces 24 during the switching process, so as to transfer the raw materials screened on the sieve plates 6. At the same time, the sieve plates 6 can be flipped over, so that the airflow generated by the blower 31 can be used to backwash and clean the blocked impurities.

[0064] Refer to the attached Figure 5-Figure 6 As shown, the sieve plate 6 is connected to the rotating ring 62 through a bearing, and the rotating ring 62 is driven to rotate by the screening motor 22; a pair of arc-shaped slides 621 are symmetrically arranged inside the rotating ring 62, and an arc-shaped slide rod 622 is fixed between the two arc-shaped slides 621. The connecting ring 64 is slidably sleeved on the arc-shaped slide rod 622 and the bottom is clamped and fixed to the filter plate 65 by a buckle 642. The filter plate 65 is detachable and convenient to replace according to the required specifications of the filtered raw materials. A force spring 623 is sleeved on the arc-shaped slide rod 622, and the two ends of the force spring 623 respectively abut the arc-shaped slide rod 621 and the connecting ring 64, so as to apply an upward force to the connecting ring 64;

[0065] Wherein, ears 641 with balls are provided on both sides of the connecting ring 64. The ears 641 are slidably sleeved on the arc-shaped sliding rod 622, and the balls are in contact with the top plate 631 to reduce the damping and noise during the rotation process of the connecting ring 64.

[0066] It is worth noting that a top ring 63 is fixed on the sieve plate 6, and a plurality of right-angled triangular top pieces 631 are evenly distributed along the circumference at the bottom of the top ring 63; the hypotenuse of each top piece 631 is used to gradually press down the connecting ring 64, and the right-angled side is used to instantly release the connecting ring 64. The number of right-angled triangular top pieces 631 at the bottom of the top ring 63 is odd, which makes it possible for the connecting ring 64 on one side to be pressed down under the action of the hypotenuse of the top piece 631, while the connecting ring 64 on the other side is in a released state. When the rotating ring 62 rotates, the top piece 631 presses down and releases the connecting ring 64 in turn, driving The filter disc 65 produces asymmetric reciprocating shaking along the trajectory of the arc-shaped slide bar 622 to simulate the shaking of the artificial screen disc 6, which is characterized by low frequency and high amplitude, so that the raw materials can jump and rotate forward in a parabolic manner on the filter disc 65. Compared with the violent impact and friction of the high-frequency vibrating screen, this screening method has less impact on the petals, which can greatly reduce the risk of breakage caused by repeated collisions. At the same time, the artificial shaking is simulated to keep the material in a loose jumping state. The sliding friction contact time between the petals and between the petals and the screen is short, and it is not easy to be broken by squeezing or scraping.

[0067] Furthermore, in the attached Figure 3In the figure, an elastic screen 66 is adhered to the inner wall of the top ring 63, an annular groove is provided on the top of the rotating ring 62, and the lower end of the elastic screen 66 is slidably connected to the annular groove through a slider. The elastic screen 66 made of food-grade silicone can effectively prevent powder, raw materials and impurities generated during the screening process from passing through the gap between the top ring 63 and the rotating ring 62 to avoid overflow.

[0068] exist Figure 6 The sieve disc 6 is rotated in the circumferential direction along the fixed axis 53 by the sleeve 61, and the sieve disc 6 is rotated in the circumferential direction along the fixed axis 53 by the sleeve 61.

[0069] Reference Figure 4 As shown, the driving assembly 5 includes a lifting motor 51, a screw 511 and a connecting frame 52; the lifting motor 51 drives the screw 511 to rotate, the connecting frame 52 is connected to the screw 511 through a threaded hole, and the fixed shaft 53 is fixed to the connecting frame 52. The lifting motor 51 drives the screw 511 to rotate, thereby pushing the connecting frame 52 connected to its outside to adjust the lifting height of the fixed shaft 53. The upper end of the fixed shaft 53 is equipped with a bracket 54 extending to the inside of the sieve drum 2, and the end of the bracket 54 is used to fix the negative pressure feed pipe 21 at one end inside the sieve drum 2 to prevent the lower end of the negative pressure feed pipe 21 from interfering with the lifting and lowering of the sieve plate 6.

[0070] Among them, the output shaft of the screening motor 22 is connected to the driving gear shaft 221, and the outer side of the rotating ring 62 is provided with a tooth groove that meshes with the gear teeth on the surface of the driving gear shaft 221. The driving gear shaft 221 is long and strip-shaped, which makes it possible for several sieve plates 6 to be at any height in the sieve drum 2 to ensure that the tooth groove on the outside of the rotating ring 62 is engaged with the driving gear shaft 221, and can be driven by the screening motor 22 to rotate.

[0071] Reference Figure 1 and Figure 7As shown, the side walls adjacent to the sieve drum 2 and the cleaning drum 3 are provided with a through slot, and a windshield 34 is provided on the side of the cleaning drum 3; a reset spring 341 and a telescopic rod 342 are provided in the windshield 34, and the end of the telescopic rod 342 is connected to the baffle 343; the top of the sleeve 61 is fixedly contacted with a triggering top block 612, and the triggering top block 612 has a chamfered corner for pushing the baffle 343 to open the through slot. By default, due to the action of the reset spring 341, the telescopic rod 342 extends out of the windshield 34, so that the baffle 343 blocks the through slot. The rotating shaft 611 passes through so that the sieve plate 6 can enter the cleaning cylinder 3. When multiple sieve plates 6 are sent into the cleaning cylinder 3, the sleeve 61 of the sieve plate 6 will use the chamfered trigger top block 612 to push open the baffle 343 during the rising process, compressing the reset spring 341. When the sleeve 61 continues to move upward, the reset spring 341 is released, and the baffle 343 will cover the through slot again, avoiding the generation of a large amount of dust and impurities that overflow through the through slot and pollute the environment during the process of using the blower 31 to clean the sieve plate 6.

[0072] A collecting hopper 35 is also provided on the outside of the cleaning cylinder 3. A feeder 4 is installed on the base 1 below the collecting hopper 35. The feed end of the feeder 4 is opposite to the discharge port of the collecting hopper 35, so that the raw materials falling from the sieve plate 6 during the spinning process can be collected and transported to the packaging line through the feeder 4.

[0073] A rose black tea preparation and screening process comprises the following steps: S1, according to the specifications of the rose petals and black tea to be screened, the reversing motor 23 is used to sequentially drive the sieve plate 6 to rotate around the fixed axis 53, and the lifting motor 51 is used to drive the sieve plate 6 with different sieve hole specifications to be fed into the interior of the sieve cylinder 2; S2, the rose petals and black tea are sucked into the filter plate 65 in the sieve cylinder 2 through the negative pressure feeding pipe 21, the screening motor 22 is started to drive the rotating ring 62 to rotate, so that the right-angled triangular top plate 631 at the bottom of the top ring 63 periodically presses down the connecting ring 64; the connecting ring 64 generates asymmetric reciprocating vibration along the trajectory of the arc-shaped slide bar 622, driving the filter plate 65 to throw the material; the rose petals and black tea of ​​different sizes are screened and retained layer by layer, and impurities such as mud and sand are removed After the sieve disc 6 enters the cleaning cylinder 3, the blower 31 sprays a high-speed airflow to the bottom of the filter disc 65, and the impurities blocked in the screen of the filter disc 65 fall into the collecting box 33 after passing through the collecting hopper 32; S5, the cleaned sieve disc 6 moves back to the sieve cylinder 2 station, and the negative pressure feed pipe 21 sucks in the next batch of raw materials for a cyclic operation.

[0074] The present invention simulates the shaking of the artificial sieve plate 6, which is characterized by low frequency and high amplitude, so that the raw materials can jump and rotate forward in a parabolic manner on the filter plate 65. Compared with the violent impact and friction of the high-frequency vibrating screen, this screening method has less impact on the petals, which can greatly reduce the risk of breakage caused by repeated collisions. At the same time, the simulated artificial shaking keeps the material in a loose and jumping state, and the sliding friction contact time between the petals and the petals and the screen is short, which is not easy to be broken by squeezing or scraping.

[0075] While the material is unloaded through the optional sieve plate 6, the blower 31 is used to flush the sieve holes with backwash airflow, which can effectively avoid the sieve holes from being blocked. During the cleaning of a single sieve plate 6, the remaining sieve plates 6 can still participate in the screening operation, avoiding shutdown for cleaning and improving preparation efficiency.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screening device for preparing rose black tea, characterized in that: It includes a base, a screen drum, a cleaning drum and a driving assembly; The sieve drum and the cleaning drum are installed side by side on the base. A negative pressure feed pipe is provided on the top of the sieve drum, a powder collecting box is built into the bottom, and a screening motor and a reversing motor are installed on the side walls respectively. There is a blower on the top of the cleaning cylinder, and a debris collecting hopper and a debris collecting box at the bottom. The driving assembly is provided with a fixed shaft that can be raised and lowered, and a number of sieve plates are sleeved on the fixed shaft. The sieve plates are driven by a reversing motor to rotate around the fixed shaft and can switch between the sieve drum and the cleaning drum. The sieve plates spin themselves during the switching process through the reversing gears. The sieve plate is connected to the rotating ring through a bearing, and the rotating ring is driven to rotate by the screening motor; a pair of arc-shaped slides are symmetrically arranged inside the rotating ring, and an arc-shaped slide rod is fixed between the two arc-shaped slides. The connecting ring is slidably sleeved on the arc-shaped slide rod and the bottom is fixed to the filter plate through a buckle. A force spring is sleeved on the arc-shaped slide rod, and the two ends of the force spring respectively abut against the arc-shaped slide and the connecting ring; A top ring is fixed on the sieve plate, and several right-angled triangular top pieces are evenly distributed along the circumference at the bottom of the top ring; when the rotating ring rotates, the top pieces press down and release the connecting rings in turn, driving the filter plate to produce asymmetric reciprocating shaking along the arc-shaped slide rod trajectory.

2. A screening device for preparing rose black tea according to claim 1, characterized in that: Ear pieces with balls are provided on both sides of the connecting ring. The ear pieces are slidably sleeved on the arc-shaped sliding rod, and the balls are in contact with the top piece.

3. A screening device for preparing rose black tea according to claim 2, characterized in that: The number of right-angled triangular top pieces at the bottom of the top ring is odd; The oblique edges of each top sheet are used for gradually pressing down the connecting ring, and the right-angled edges are used for instantaneously releasing the connecting ring.

4. A screening device for preparing rose black tea according to claim 3, characterized in that: The inner wall of the top ring is adhered to the elastic screen, the top of the rotating ring is provided with an annular sliding groove, and the lower end of the elastic screen is slidably connected in the annular sliding groove through a slider.

5. A screening device for preparing rose black tea according to claim 4, characterized in that: One side of the sieve plate is connected to the sleeve via a rotating shaft, which is connected to the fixed shaft via a sleeve bearing, and a tooth groove is provided on the outer side of the sleeve; The output shaft of the reversing motor is fixedly connected to the driving gear, and the driving gear is meshed with the tooth groove of the sleeve; The outer side of the rotating shaft is fixedly connected to the reversing helical gear, and the side wall of the screen drum is provided with a reversing tooth plate, and the tooth groove of the reversing tooth plate is meshed with the reversing helical gear.

6. A screening device for preparing rose black tea according to claim 5, characterized in that: The driving assembly includes a lifting motor, a lead screw and a connecting frame; The lifting motor drives the lead screw to rotate, the connecting frame is sleeved with the lead screw through the threaded hole, and the fixed shaft is fixed to the connecting frame; The upper end portion of the fixed shaft is provided with a bracket extending to the interior of the sieve drum, and the end portion of the bracket is used for fixing one end of the negative pressure feed pipe inside the sieve drum.

7. A screening device for preparing rose black tea according to claim 6, characterized in that: The output shaft of the screening motor is connected to a driving gear shaft, and the outer side of the rotating ring is provided with a tooth groove that meshes with the gear teeth on the surface of the driving gear shaft.

8. The screening device for preparing rose black tea according to claim 7, characterized in that: The adjacent side walls of the screen cylinder and the cleaning cylinder are provided with through slots, and a wind shield is provided on the side of the cleaning cylinder; The windshield is provided with a return spring and a telescopic rod, and the end of the telescopic rod is connected to the baffle; The top of the sleeve is fixedly contacted with a triggering top block, which has a chamfered corner and is used to push the blocking piece to open the through slot.

9. The screening device for preparing rose black tea according to claim 8, wherein: A collecting hopper is further provided on the outside of the cleaning cylinder. A feeder is installed on the base below the collecting hopper, and the feed end of the feeder faces the discharge port of the collecting hopper.

10. A rose black tea preparation and screening process, applied to the rose black tea preparation and screening device according to claim 9, characterized in that: The steps include: S1. According to the specifications of the rose petals and black tea to be screened, the reversing motor is used to drive the sieve discs to rotate around the fixed axis in sequence, and the lifting motor is used to drive the sieve discs with different mesh specifications into the interior of the sieve drum; S2. Rose petals and black tea are sucked into the filter disc in the sieve drum through the negative pressure feed pipe. The screening motor is started to drive the rotating ring to rotate, so that the right-angled triangle top plate at the bottom of the top ring periodically presses down the connecting ring. The connecting ring produces asymmetrical reciprocating vibration along the arc-shaped slide bar trajectory, driving the filter disc to sprinkle materials; Rose petals and black tea of ​​different sizes are screened and retained layer by layer, and the mud and sand impurities fall into the powder collection box for collection; S3. After the screening is completed, the reversing motor drives the sieve plate to rotate around the fixed axis in sequence. In the process of moving to the cleaning cylinder, the reversing gear engages the reversing bevel gear on the top of the sleeve, forcing the sieve plate to rotate 180 degrees. The rose petals and black tea screened and retained on the sieve plate are put into the collecting hopper and transported to the packaging line through the conveyor below the collecting hopper. S4. After the sieve plate enters the cleaning cylinder: the blower sprays high-speed airflow to the bottom of the filter plate, and the impurities blocked in the filter plate screen fall into the collection box after passing through the collection bucket; S5. The cleaned sieve plate is moved back to the sieve drum station, and the negative pressure feed pipe sucks in the next batch of raw materials for a cyclic operation.

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