Preparation process of high-aroma color-protected ultra-micro tea powder

Abstract

The application provides a preparation process of high-aroma color-protected superfine tea powder, comprising the following steps: S1, raw material selection and mixing; S2, instant high-temperature sterilization; S3, vacuum low-temperature drying; S4, airflow crushing and grinding; S5, tea powder screening; the superfine tea powder is screened through a screening device, the qualified superfine tea powder after screening is collected in a collecting device, and the oversize material screened out continues steps S6-S8; S6, enzyme hydrolysis of the oversize material; after water stirring and dissolving, an appropriate amount of enzyme preparation is added, and enzyme hydrolysis is formed to form a tea solution; S7, low-temperature spray drying; the tea solution is dried to form a solid powder; S8, mixing; the solid powder is backfilled into the finished superfine tea powder and mixed. Based on this, the tea powder particles screened out and not meeting the requirements can be reused, and the taste, aroma and color of the finished superfine tea powder can be improved, the process produces less heat, the color of the tea powder can be maintained, more tea aroma can be retained, and the aroma protection and color protection effects can be achieved.

Description

Technical Field

[0001] This application relates to the field of tea processing technology, and in particular to a preparation process for highly aromatic and color-protecting ultrafine tea powder. Background Technology

[0002] Ultrafine tea powder is a new type of tea product made from tea leaves using modern food ultrafine pulverization technology. It is a natural ultrafine tea powder produced through multiple processes including steaming, cooling, dehydration, compound drying, and combined pulverization. During this process, the natural color, nutrients, and pharmacological components of the tea leaves are preserved to the maximum extent. Furthermore, the ultrafine pulverization process breaks down the cell walls of the tea leaves, making them more easily absorbed by the human body, thus improving the body's absorption rate of the tea's nutrients.

[0003] Currently, air jet mills are commonly used to pulverize tea leaves. The resulting ultrafine tea powder has a wide mesh size range, with high-quality powder exceeding 800 mesh and lower-quality powder only around 500-600 mesh. For premium ultrafine tea powder with high requirements for taste, aroma, and color, the selected ultrafine powder mesh is typically between 800 and 1200 mesh, requiring screening and separation of the ultrafine powder. However, the unsuitable tea powder particles identified during screening are difficult to re-pulverize using an air jet mill, resulting in resource waste and increased production costs, which warrants improvement. Summary of the Invention

[0004] Based on this, this application provides a preparation process for high-aroma and color-protecting ultrafine tea powder, which can reuse the unqualified tea powder particles that have been screened out, and use them to improve the taste, aroma and color of the finished ultrafine tea powder, thereby achieving the effect of preserving aroma and color.

[0005] The preparation process of the high-aroma, color-protecting ultrafine tea powder provided in this application adopts the following technical solution: A process for preparing highly aromatic and color-protecting ultrafine tea powder includes the following steps: Step S1: Select and mix raw materials; Step S2, instantaneous high-temperature sterilization; Step S3: Vacuum low-temperature drying; Step S4, airflow pulverization and grinding; Step S5, sieving tea powder; the ultrafine tea powder is sieved through a sieving device, and the qualified ultrafine tea powder after sieving is collected in the collection device, while the sieved material continues to steps S6-S8. Step S6: Enzymatic hydrolysis of the sieved material; after adding water and stirring to dissolve, add an appropriate amount of enzyme preparation, and let it stand to hydrolyze and form a tea solution; Step S7: Low-temperature spray drying; the tea solution is dried to form a solid powder. Step S8, mixing: The solid powder is backfilled into the finished ultrafine tea powder and mixed with it.

[0006] By adopting the above-mentioned technical solution, the tea raw materials of this application are selected and yellow leaves and other defective products are removed before being mixed. The bacteria are killed by instantaneous high-temperature sterilization to ensure that the microbial content in the finished product meets the qualified food safety standards. Vacuum microwave low-temperature drying allows the moisture in the tea to absorb heat and vaporize, which minimizes damage to the effective components of the material. Furthermore, this process generates less heat, which can maintain the color of the tea powder and retain more tea aroma, thus achieving a preliminary effect of preserving aroma and color.

[0007] In addition, after tea leaves are pulverized and ground into ultrafine tea powder through airflow, the ultrafine tea powder is sieved through a sieving device. Qualified ultrafine tea powder that passes through a sieve with a mesh size greater than 800 mesh can be directly collected as finished product. The material intercepted by the sieving device is reused to extract the effective components such as aroma and flavor from the tea powder through enzymatic hydrolysis. This material is then spray-dried at low temperature to form a solid powder, which is then added back to the finished ultrafine tea powder. After the solid powder is mixed with the finished ultrafine tea powder, the color, aroma, and flavor quality of the finished ultrafine tea powder can be improved, making the ultrafine powder fine and uniform overall, with a bright color and rich tea aroma, and further enhancing the aroma and color preservation effect.

[0008] Optionally, the sieving device in step S5 includes a feed pipe for feeding ultrafine tea powder, a finished product pipe for feeding undersize material, a sieving mechanism for sieving ultrafine tea powder, and an enzymatic hydrolysis pipe for collecting oversize material. The enzymatic hydrolysis pipe is connected to an enzymatic hydrolysis box for the enzymatic hydrolysis operation in step S6. The screening mechanism includes a fixed base, a rotating seat rotatably mounted on the fixed base, and a drive assembly for driving the rotating seat to rotate. The rotating seat is provided with multiple mounting chambers in the circumference, and each mounting chamber is equipped with a screening unit. The feed pipe is located above the rotating base, and the finished product pipe is located below the rotating base. The feed pipe and the finished product pipe are directly opposite each other and maintain a distance, forming a screening zone. The screening zone is equipped with a vibration mechanism to drive the screening unit to vibrate. The enzymatic hydrolysis pipe is located below the rotating seat, forming a material discharge area, which is equipped with a transfer mechanism for transferring the material on the screen to the enzymatic hydrolysis pipe; after the rotating seat rotates, the screening unit passes through the screening area and the material discharge area in sequence.

[0009] By adopting the above technical solution, the ultrafine tea powder obtained by airflow pulverization and grinding falls into the screening unit of the screening section through the feeding pipe. The qualified finished ultrafine tea powder passes through the sieve and directly enters the finished product pipe, where it is collected in the collection device. The ultrafine tea powder with larger particle size is intercepted by the screening unit of the screening section. After a period of screening, the material on the sieve accumulates to a certain amount. By controlling the drive component, the rotating seat is driven to rotate, and the screening unit can move to the material dropping area. By controlling the transfer mechanism, the material on the sieve is transferred to the enzymatic hydrolysis pipe and falls into the enzymatic hydrolysis box, which facilitates the enzymatic hydrolysis operation of the material on the sieve by the operators, thereby improving the overall production efficiency of ultrafine tea powder.

[0010] Optionally, the screening unit includes a housing and an ultrafiltration assembly. The housing is fitted into the installation chamber. The housing is provided with an installation groove that extends through the upper and lower sides of the housing. The ultrafiltration assembly includes a receiving box, a first screen, and a sieving cylinder. The receiving box and the first screen are elastically connected to the inner wall of the installation groove, and the receiving box and the first screen are linked together. The first screen is located inside the receiving box, with its center higher than its peripheral edge; the sieve cylinder is attached to the bottom of the first screen, and there is a material drop space between the first screen and the inner wall of the receiving box for the material on the screen to fall into the receiving box. The bottom of the receiving box is equipped with a second annular screen, and the bottom of the screening cylinder has an extension tube extending to the inside of the second screen. A collection box for collecting the material on the screen is provided between the screening cylinder and the extension tube, and the top of the collection box is open.

[0011] By adopting the above technical solution, and by setting up a receiving box and a first screen that are elastically connected to the inner wall of the installation groove, the ultrafine tea powder falls onto the first screen of the screening unit in the screening section. Through the vibration of the vibration mechanism, the ultrafine tea powder with a qualified mesh size can directly pass through the first screen and enter the screening cylinder below, thus falling into the finished product pipeline. The intercepted material on the screen gradually moves towards the periphery of the first screen under vibration, and can fall into the receiving box through the material drop space. Then, the material on the screen passes through the second screen under vibration, further screening the ultrafine tea powder to ensure that all qualified ultrafine tea powder passes through the screen. Finally, the material on the screen can enter the collection box for collection.

[0012] Optionally, the collection box is partially provided with an air inlet and a material outlet. The air inlet is located on the side of the collection box, and the material outlet is located at the bottom of the collection box. A baffle is slidably connected to the outer side of the collection box, and a first spring is provided between the baffle and the collection box. The first spring is used to force the baffle to block the air inlet and the material outlet in a normal state. The transfer mechanism includes a guide seat fixed to a fixed base, a first slide block slidably disposed on the fixed base, and a first driving member for driving the first slide block to move. When the screening unit moves to the material drop area, the guide seat forces the collection box to move upward and abut against the bottom of the screening cylinder. At this time, the collection box is in a closed state. The top of the first slide is provided with an air inlet pipe, which is directly opposite the air inlet. The air inlet pipe is connected to a wind pressure mechanism for supplying air. The first slide is partially provided with a guide part. When the first driving member is activated, the guide part forces the baffle to move outward to open the air inlet and the material discharge port. Finally, the air inlet pipe abuts against the collection box and is directly connected to the air inlet.

[0013] By adopting the above technical solution, the baffle normally blocks the air inlet and the discharge port under the elastic force of the first spring, so that the collection box can collect the material on the screen normally when the screening section is in the screening area. When the screening unit rotates to the discharge area, the guide seat can force the collection box to move upward and abut against the bottom of the screening cylinder, so that the collection box is in a closed state. At this time, the first slide is located outside the screening unit. By controlling the action of the first driving component, the first slide is driven to move towards the screening unit. The guide part of the first slide forces the baffle to move outward, which can open the air inlet and the discharge port. Then the first slide continues to move towards the screening unit. Finally, the air inlet pipe can abut against the collection box. The air inlet pipe is directly connected to the air inlet of the collection box. By controlling the operation of the wind pressure mechanism to send air into the collection box, the material on the screen can leave from the discharge port and enter the enzymatic hydrolysis pipe, so as to facilitate the smooth transfer of the material on the screen.

[0014] Optionally, the mounting slot is provided with multiple first hanging rods and multiple second hanging rods, and each first hanging rod and each second hanging rod is fitted with a second spring; the side of the receiving box is provided with a first ring sleeve, which is used to engage with the first hanging rods. The receiving box has multiple connecting slots on its side, and the first screen has multiple connecting posts on its side. Each connecting post passes through the connecting slot and is partially exposed outside the receiving box. The end of the connecting post has a second ring for engaging with the second hanging rod.

[0015] By adopting the above technical solution, the material receiving box can be elastically connected to the inner wall of the mounting groove through the hooking and engagement of the first ring sleeve and the first hanging rod; the first screen can be elastically connected to the inside of the mounting groove through the hooking and engagement of the second ring sleeve and the second hanging rod; and since the connecting column passes through the connecting groove of the material receiving box, the material receiving box and the first screen can be linked together.

[0016] Optionally, the screening device is also equipped with a cleaning zone and a drying zone. After the rotating seat rotates, the screening unit passes through the screening zone, the material discharge zone, the cleaning zone and the drying zone in sequence. The cleaning zone is equipped with a cleaning mechanism for cleaning the screening unit, and the drying zone is equipped with a drying mechanism for drying the screening unit. The screening unit is provided in four groups. The two groups of screening units located on the diagonal are connected by a connecting structure to enable the vibration mechanism to drive the screening units located in the screening zone and the screening units located in the washing zone to vibrate together.

[0017] By adopting the above technical solution, after the screening unit screens the ultrafine tea powder in the screening zone and transfers the material on the screen in the discharge zone, the drive component is controlled to rotate the rotating seat. The screening unit then passes through the cleaning zone, where the cleaning mechanism washes the screening unit to remove tea powder particles clogging the pores. The rotating seat then rotates again, and the screening unit passes through the drying zone to dry, reducing liquid adhesion to the surface of the ultrafiltration component and ensuring smooth operation in the next screening cycle. Furthermore, by setting a connecting structure to connect two sets of screening units located diagonally, when the vibration mechanism drives the screening unit in the screening zone to vibrate, the screening unit in the cleaning zone can vibrate together, further facilitating the discharge of tea powder particles clogging the pores.

[0018] Optionally, the connection structure includes a connecting rod that passes through the rotating seat and spring self-locking buckles at both ends of the connecting rod. The receiving box has a snap-fit ​​block on its side. When the housing is installed in the installation chamber, the snap-fit ​​block and the spring self-locking buckle engage.

[0019] By adopting the above technical solution, after the operator installs the housing into the installation chamber, the snap-fit ​​block of the housing is forced to contact the spring self-locking buckle, which enables the spring self-locking buckle to engage with the snap-fit ​​block, so that the screening unit is securely connected to the connecting rod. After the two sets of screening units are connected to the connecting rod, the two sets of screening units can vibrate together. When it is necessary to remove the screening unit for maintenance, by forcing the snap-fit ​​block of the housing to abut against the spring self-locking buckle again, the locking between the two can be automatically released, so as to facilitate the quick disassembly of the screening unit.

[0020] Optionally, the vibration mechanism includes a second slide block slidably disposed above the fixed base and a second driving member for driving the second slide block to move. The second slide block is located outside the receiving box. A plug-in post is elastically connected to the side of the second slide block near the receiving box, and a vibration motor is installed inside the plug-in post. A plug-in pipe is provided on the side of the receiving box, and the plug-in pipe and the plug-in post are plugged and matched. When the screening unit rotates to the screening section, the plug-in pipe and the plug-in post are positioned opposite each other.

[0021] By adopting the above technical solution, when the screening unit rotates to the screening section, the second driving component is controlled to force the insertion column to move closer to the screening unit. Finally, the insertion column can be matched and inserted into the insertion tube. By controlling the operation of the vibration motor, the receiving box and the first screen can be rotated together, thereby screening and separating the ultrafine tea powder falling on the first screen.

[0022] Optionally, the cleaning mechanism includes a cleaning pipe located below the rotating base and a water-blocking plate located above the rotating base. When the screening unit rotates to the cleaning zone, the water-blocking plate covers the top surface of the housing. A sealing cover is movably connected to the top of the cleaning pipe, and a first lifting component is connected to the side of the cleaning pipe to drive the sealing cover to rise and fall. When the first lifting component moves, the sealing cover matches and abuts against the bottom surface of the receiving box. A high-pressure nozzle for spraying water onto the ultrafiltration module is provided inside the cleaning pipe.

[0023] By adopting the above technical solution, when the screening unit rotates to the cleaning zone, the water-blocking plate can cover the top surface of the shell. By controlling the action of the first lifting component, the sealing cover is moved upward and pressed against the bottom surface of the shell. Then, the ultrafiltration component is rinsed by the high-pressure nozzle, which can quickly flush out the powder on the screen that is blocked in the screen mesh, which is more conducive to thoroughly cleaning the ultrafiltration component.

[0024] Optionally, the bottom of the enzymatic hydrolysis pipe is provided with a wide opening, the top of the enzymatic hydrolysis box is open, and the enzymatic hydrolysis box and the wide opening are detachably connected by a locking fastener.

[0025] By adopting the above technical solution, the enzyme hydrolysis box and the wide mouth are detachably connected by a locking fastener, which facilitates the disassembly of the enzyme hydrolysis box. After collecting the sieve residue in the enzyme hydrolysis box for a period of time, it can be easily transferred and water and enzymes can be added for enzymatic hydrolysis. By detachably connecting another enzyme hydrolysis box to the wide mouth, the collection of sieve residue can continue.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By reusing the material intercepted by the sieving device, the effective components such as aroma and flavor in the tea powder are obtained through enzymatic hydrolysis. The solid powder is then formed by low-temperature spray drying and backfilled into the finished ultrafine tea powder. This process can improve the color, aroma, and flavor quality of the finished ultrafine tea powder, making the ultrafine powder fine, uniform, and bright in color. Furthermore, this process generates less heat, which can maintain the color of the tea powder and retain more tea aroma, thus having a further effect on aroma preservation and color protection. 2. After the material on the sieve falls onto the first sieve, the vibration of the vibration mechanism enables the qualified ultrafine tea powder to pass through the sieve smoothly; the intercepted material on the sieve falls into the receiving box through the material drop space under the vibration, and passes through the second sieve under the vibration to screen the ultrafine tea powder again, which can ensure that the qualified ultrafine tea powder passes through the sieve completely. 3. By setting a connection structure so that the two sets of screening units located on the diagonal can be connected to each other, when the vibration mechanism drives the screening units in the screening area to vibrate, the screening units located in the washing area can vibrate together, which is conducive to further discharging the tea powder particles that are blocked in the sieve holes. Attached Figure Description

[0027] Figure 1 This is a flowchart of the preparation process of ultrafine tea powder in this embodiment; Figure 2 This is a schematic diagram of the overall structure of the screening device in this embodiment; Figure 3 yes Figure 2 The enlarged view at point A mainly shows the structure of the driving component; Figure 4 This is a partial cross-sectional view of the screening unit in this embodiment; Figure 5 yes Figure 4 The enlarged view at point B mainly shows the connection structure between the receiving box and the inner wall of the mounting groove; Figure 6 This is a schematic diagram of the connection structure between the first screen and the inner wall of the mounting groove in this embodiment; Figure 7 This is a schematic diagram of the various mechanisms and components located in the screening section in this embodiment; Figure 8 yes Figure 7 The enlarged view at point C mainly shows the cooperation between the vibration mechanism and the ultrafiltration component; Figure 9 This is a schematic diagram of the bottom structure of the screening unit in this embodiment; Figure 10 This is a schematic diagram of the transfer mechanism located in the material dropping area in this embodiment; Figure 11 yes Figure 10 The enlarged view at point D mainly shows the fit between the second slide and the baffle; Figure 12 This is a schematic diagram of the cleaning mechanism located in the cleaning area in this embodiment; Figure 13 This is a partial sectional view of the rotary seat in this embodiment, mainly showing the specific structure of the connection structure; Figure 14 This is a schematic diagram of the overall structure of the screening device from another direction in this embodiment, mainly showing the specific structure of the rod drying mechanism.

[0028] Explanation of reference numerals in the attached drawings: 1. Screening mechanism; 11. Fixed base; 111. First support; 112. Second support; 12. Rotary seat; 122. Mounting chamber; 123. Sliding slot; 124. Hollow groove; 13. Drive assembly; 131. Ring gear; 132. Rotary motor; 133. Drive gear; 14. Screening section; 15. Material discharge area; 16. Washing area; 17. Drying area; 2. Screening unit; 21. Housing; 211. Mounting groove; 212. First hanging rod; 213. Second hanging rod; 214. Second spring; 215. Anti-detachment block; 22. Receiving box; 221. First ring sleeve; 222. Connecting groove; 223. Insertion pipe; 224. Snap-fit ​​block; 23. First screen; 231. Connecting column; 232. Second ring sleeve; 24. Screening cylinder; 241. Extension pipe; 25. Second screen; 26. Collection box; 261. Air inlet; 262. Material discharge port; 263. Baffle; 2631. Support rod; 264. First spring; 265. Retaining wall; 27. Material discharge space; 28. Connecting structure; 281. Connecting rod; 282. Spring self-locking buckle; 3. Feed pipe; 4. Finished product pipe; 41. Lifting pipe; 42. First elastic pad; 43. Second lifting component; 5. Enzymatic hydrolysis pipe; 51. Wide opening; 52. Enzymatic hydrolysis box; 53. Locking fastener; 6. Cleaning mechanism; 61. Cleaning pipe; 62. Water baffle; 63. Sealing cover; 64. First lifting component; 65. Circular pipeline; 66. High-pressure nozzle; 7. Drying mechanism; 8. Vibration mechanism; 81. Second slide; 82. Second drive component; 83. Insertion post; 831. Tension spring; 84. Vibration motor; 9. Transfer mechanism; 91. Guide seat; 911. Abutment plate; 92. First slide; 921. Guide part; 93. First drive component; 94. Air intake pipe; 95. Air pressure mechanism; 96. Corrugated pipe. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-14 This application will be described in further detail.

[0030] This application discloses a preparation process for highly aromatic and color-protecting ultrafine tea powder.

[0031] Reference Figure 1 A preparation process for a highly aromatic and color-protecting ultrafine tea powder specifically includes the following steps: Step S1, Raw material selection and mixing: The tea raw materials are selected by workers or by automatic equipment, and defective tea leaves are removed before the raw materials are mixed.

[0032] Step S2, instant high-temperature sterilization; send the tea leaves into the high-temperature sterilization machine, set the sterilization temperature to 145℃ and the sterilization time to 4.5 seconds, and perform instant high-temperature sterilization to ensure that the microbial content in the tea leaves meets the qualified food safety standards. Step S3, vacuum low-temperature drying: The sterilized tea leaves are sent to a vacuum microwave dryer for drying, so that the moisture in the tea leaves absorbs heat, rises in temperature, vaporizes and is discharged; the dried tea leaves are sent to a cyclone separator for dust removal, which also cools the tea leaves.

[0033] Step S4, air jet milling: The cooled tea leaves are fed into an air jet mill for milling. The feeding frequency of the air jet mill is 50-55 Hz, the screw speed is 5500 rpm, and the blower speed is 45 Hz.

[0034] Step S5: Sieve the tea powder; the ultrafine tea powder is sieved through a sieving device, and the qualified ultrafine tea powder after sieving is collected in the collection device, while the sieved material continues to steps S6-S8.

[0035] Step S6: Enzymatic hydrolysis of the sieve residue; the sieved residue is collected in the enzymatic hydrolysis tank 52, water is added, stirred and dissolved, and then appropriate amounts of cellulase, pectinase, etc. are added. After standing, the enzymatic hydrolysis is carried out to form a tea solution, thereby obtaining the effective components in the tea powder.

[0036] Step S7, low-temperature spray drying: The enzymatically hydrolyzed tea solution enters a low-temperature spray dryer for low-temperature spray drying, and after drying, it forms a solid powder.

[0037] Step S8, mixing: The solid powder formed after spray drying is backfilled into the finished ultrafine tea powder and mixed with the finished ultrafine tea powder, thereby improving the color, aroma and flavor quality of the finished ultrafine tea powder, making the ultrafine powder fine and uniform overall, with bright color and rich tea aroma.

[0038] Reference Figure 2 The screening device in step S5 includes a feed pipe 3, a finished product pipe 4, a screening mechanism 1, an enzymatic hydrolysis pipe 5, a cleaning mechanism 6, and a drying mechanism 7; wherein, the screening mechanism 1 includes a fixed base 11, a rotating seat 12 rotatably mounted on the top surface of the fixed base 11, and a drive assembly 13 for driving the rotating seat 12 to rotate. See details below. Figure 3 The drive assembly 13 includes an annular gear ring 131 coaxially fixed to the bottom of the rotating base 12, a rotating motor 132 fixedly mounted on the fixed base 11, and a drive gear 133 connected to the output end of the rotating motor 132. The drive gear 133 meshes with the outer teeth of the annular gear ring 131 to drive the rotation of the rotating motor 132 to rotate circumferentially around its own central axis.

[0039] Back Figure 2 The rotating base 12 is provided with multiple mounting chambers 122, each of which extends through the upper and lower sides of the rotating base 12, and all mounting chambers 122 are equidistantly arranged around the central axis of the rotating base 12. In this embodiment, the number of mounting chambers 122 is set to four, while in other feasible embodiments, the number of mounting chambers 122 may also be five or six, and is not limited to the manner provided in this embodiment. Each mounting chamber 122 is equipped with a sieving unit 2 for screening and separating ultrafine tea powder, that is, the number of sieving units 2 is also four.

[0040] The feed pipe 3 is fixedly connected to the discharge end of the air jet mill. The end of the feed pipe 3 away from the air jet mill is vertically arranged and abuts against the upper surface of the rotating base 12. The finished product pipe 4 is arranged below the rotating base 12 and is vertically arranged. The feed pipe 3 and the finished product pipe 4 are directly opposite each other and maintain a gap, thereby forming a screening section 14. A set of screening units 2 can be located in the screening section 14, so that the ultrafine tea powder after air jet milling can fall into the screening unit 2 through the feed pipe 3 for screening, thereby separating the ultrafine tea powder between 800 mesh and above. The qualified ultrafine tea powder can enter the finished product pipe 4 and be collected in the collection device.

[0041] Reference Figure 4 The screening unit 2 includes a housing 21 and an ultrafiltration assembly. In this embodiment, the housing 21 is rectangular. (See also...) Figure 2 The mounting chamber 122 has a sliding slot 123 extending to the outer periphery of the rotating seat 12 on its side away from the center of the rotating seat 12. The width of the sliding slot 123 is equal to the diagonal distance of the housing 21. By fitting the housing 21 into the sliding slot 123 and pushing the housing 21 into the inner wall of the mounting chamber 122, the housing 21 can be locked in the mounting chamber 122 by using fasteners.

[0042] Back Figure 4 The housing 21 is provided with an installation groove 211 for installing an ultrafiltration assembly. The installation groove 211 extends through the upper and lower sides of the housing 21. The ultrafiltration assembly includes a receiving box 22, a first screen 23 and a sieve cylinder 24. The receiving box 22 and the first screen 23 are elastically connected to the inner wall of the installation groove 211, and the receiving box 22 and the first screen 23 are linked together.

[0043] Specifically, refer to Figure 5 Multiple first hanging rods 212 are fixed inside the mounting groove 211, and all the first hanging rods 212 are evenly distributed on the inner walls of the mounting groove 211; each first hanging rod 212 is fitted with a second spring 214. The receiving box 22 in this embodiment is also rectangular, and each side of the receiving box 22 is fixed with a first ring 221. The number of first rings 221 is equal to the number of first hanging rods 212, and the inner diameter of the first ring 221 is larger than the outer diameter of the first hanging rod 212.

[0044] By fitting each first ring sleeve 221 onto each first hanging rod 212, the first ring sleeve 221 can abut against the second spring 214, thus achieving an elastic connection between the receiving box 22 and the inner wall of the mounting groove 211. In addition, the top of the first hanging rod 212 is threaded with an anti-detachment block 215, the outer diameter of which is larger than the inner diameter of the first ring sleeve 221, which can prevent the first ring sleeve 221 from directly detaching from the first hanging rod 212.

[0045] Reference Figure 6 Multiple second hanging rods 213 are fixed inside the mounting groove 211. All second hanging rods 213 are evenly distributed on the inner walls of the mounting groove 211, and the second hanging rods 213 are staggered with the first hanging rods 212. Each second hanging rod 213 is also fitted with a second spring 214. In this embodiment, the first screen 23 is a rectangular mesh structure. The first screen 23 is located inside the receiving box 22, and multiple connecting posts 231 are fixed on each side of the first screen 23. Multiple connecting grooves 222 are opened on each side of the receiving box 22. Each connecting post 231 passes through the corresponding connecting groove 222 and is partially exposed outside the receiving box 22. A second ring 232 is fixed at the end of the connecting post 231 away from the first screen 23. The inner diameter of the second ring 232 is larger than the outer diameter of the second hanging rod 213.

[0046] By fitting each second ring 232 onto each second hanging rod 213, the second ring 232 can abut against the second spring 214, achieving an elastic connection between the receiving box 22 and the inner wall of the mounting groove 211. Additionally, an anti-detachment block 215 is threaded onto the top of the second hanging rod 213. The outer diameter of the anti-detachment block 215 is larger than the inner diameter of the second ring 232, preventing the second ring 232 from directly detaching from the second hanging rod 213. It should be noted that in this embodiment, the internal dimensions of the connecting groove 222 are larger than the external dimensions of the connecting post 231. A spring sheet (not shown in the figure) is provided between the connecting post 231 and the inner wall of the connecting groove 222 to achieve a linkage between the receiving box 22 and the first screen 23.

[0047] Back Figure 4 The first screen 23 has first ultrafiltration pores on its surface, and the sieve cylinder 24 is attached to the bottom of the first screen 23. When the first screen 23 vibrates, qualified ultrafine tea powder can pass through the first ultrafiltration pores and fall into the sieve cylinder 24. In this embodiment, the top surface of the first screen 23 is an arc-shaped surface, and the middle part of the first screen 23 is higher than the peripheral edge of the first screen 23, which is used to force the ultrafine tea powder to move to the periphery of the first screen 23 when the first screen 23 vibrates. A material drop space 27 is formed between the first screen 23 and the inner wall of the receiving box 22. The material intercepted by the first screen 23 can fall into the receiving box 22 through the material drop space 27 under the action of vibration.

[0048] The bottom of the receiving box 22 is fixedly connected to a second screen 25. The second screen 25 is set as an annular shape, and the surface of the second screen 25 is provided with a second ultrafiltration pore for further screening of qualified ultrafine tea powder in the sieve material. The bottom of the sieve cylinder 24 is integrally formed with an extension tube 241, which extends to the inside of the second screen 25. When the screening unit 2 stops at the screening section 14, the finished product pipe 4 is located directly below the second screen 25 and the extension tube 241.

[0049] Simultaneously refer to Figure 7 The top of the finished product pipe 4 is slidably connected to a lifting pipe 41, and the top of the lifting pipe 41 is bonded with a first elastic pad 42. A second lifting component 43 is fixed to the side of the finished product pipe 4. The second lifting component 43 is configured as a hydraulic cylinder, and the movable end of the second lifting component 43 is connected to the lifting pipe 41. When the second lifting component 43 is in a normally retracted state, by controlling the movement of the second lifting component 43, the lifting pipe 41 can move upward and make the first elastic pad 42 abut against the bottom of the receiving box 22. At this time, the ultrafiltration component is vibrated, and the qualified mesh ultrafine tea powder can enter the lifting pipe 41 through the extension pipe 241 or the second screen 25, and thus fall into the finished product pipe 4 and be collected by the collection device.

[0050] Back Figure 4 A collection box 26 is provided between the inner side of the second screen 25 and the outer side of the extension tube 241. The collection box 26 is annular and has an open top. The top edge of the collection box 26 is fixed to the inner wall of the second screen 25, and the inner side of the collection box 26 abuts against the extension tube 241. After the material on the screen falls into the receiving box 22 through the material drop space 27, it is forced to continue to move towards the center of the receiving box 22 by vibration, and finally the material on the screen can fall into the collection box 26 for collection.

[0051] Additionally, refer to Figure 7 and Figure 8 The screening section 14 is equipped with a vibration mechanism 8 for driving the screening unit 2 to vibrate. The vibration mechanism 8 includes a second slide 81, a second drive member 82, a plug-in column 83, and a vibration motor 84. A first support 111 is fixed on the top surface of the fixed base 11. The second slide 81 is slidably connected to the first support 111 via a slide rail. The second drive member 82 is a hydraulic cylinder. The cylinder body of the second drive member 82 is fixed to the first support 111, and the movable end of the second drive member 82 is fixedly connected to the second slide 81. When the screening unit 2 rotates to the screening section 14, the second slide 81 is located outside the receiving box 22. By controlling the movement of the second drive member 82, the second slide 81 can be forced to move towards the receiving box 22.

[0052] The insertion post 83 is located on the side of the second slide block 81 near the receiving box 22, and is elastically connected to the second slide block 81 by several tension springs 831; the vibration motor 84 is fixedly installed inside the insertion post 83. The side of the receiving box 22 is provided with a insertion pipe 223, the internal dimensions of which match the external dimensions of the insertion post 83; when the screening unit 2 rotates to the screening section 14, the insertion pipe 223 can be positioned directly opposite the insertion post 83. After controlling the second drive member 82 to move the second slide block 81, the insertion post 83 can be inserted into the insertion pipe 223, and the vibration of the vibration motor 84 can force the insertion pipe 223 to vibrate, thereby driving the receiving box 22 and the first screen 23 to vibrate together, so as to smoothly screen the ultrafine tea powder.

[0053] Reference Figure 9 The collection box 26 is partially provided with an air inlet 261 and a material discharge port 262, which are respectively connected to the inside of the collection box 26. The air inlet 261 is located on one side of the collection box 26, while the material discharge port 262 is located at the bottom of the collection box 26. A baffle 263 is slidably connected to the outer side of the collection box 26, and a first spring 264 is provided between the baffle 263 and the collection box 26. The first spring 264 can always generate an elastic force acting on the baffle 263, so that the baffle 263 normally blocks the air inlet 261 and the material discharge port 262, so that the collection box 26 can smoothly collect the material on the screen in the screening section 14.

[0054] Back Figure 2 The enzymatic hydrolysis pipe 5 is vertically positioned below the rotating seat 12. The top of the enzymatic hydrolysis pipe 5 is open, forming a material discharge area 15. When the rotating seat 12 rotates, the screening unit 2 can enter the material discharge area 15 from the screening section 14. The material discharge area 15 is equipped with a transfer mechanism 9 for transferring the material on the screen into the enzymatic hydrolysis pipe 5. (See also...) Figure 3 The bottom of the enzymatic hydrolysis pipe 5 is provided with an integrally formed wide opening 51. The wide opening 51 is a flared shape, narrow at the top and wide at the bottom, and the wide opening 51 is detachably connected to an enzymatic hydrolysis box 52. The enzymatic hydrolysis box 52 is used to collect the material over the sieve and use the material over the sieve for the enzymatic hydrolysis operation in step S6. In this embodiment, the enzymatic hydrolysis box 52 and the wide opening 51 are detachably connected by a locking fastener 53. The locking fastener 53 is a conventional design in the art and will not be described in detail here.

[0055] Reference Figure 10 The transfer mechanism 9 includes a guide seat 91, a first slide 92, and a first drive member 93. The guide seat 91 is fixed to the top of the fixed base 11, and an abutment plate 911 is provided on the top of the guide seat 91. The two ends of the abutment plate 911 are lower than the middle of the abutment plate 911. (See also...) Figure 4When the screening unit 2 rotates to the material discharge area 15 under the drive of the drive assembly 13, the collection box 26 can abut against the abutment plate 911 and gradually move upward. Finally, the collection box 26 moves upward to its limit position and abuts against the bottom of the screening cylinder 24, so that the collection box 26 is in a closed state. It should be noted that, referring to Figure 9 and Figure 10 At this time, the enzymatic hydrolysis pipe 5 can abut against the bottom surface of the collection box 26 and be directly opposite the discharge port 262, so that the material on the sieve can smoothly enter the enzymatic hydrolysis pipe 5 for collection.

[0056] Back Figure 10 A second support 112 is fixed to the top surface of the fixed base 11, and a first slide block 92 is slidably connected to the second support 112 via a slide rail. A first driving member 93 is configured as a hydraulic cylinder, with the cylinder body of the first driving member 93 fixed to the second support 112 and the movable end of the first driving member 93 fixedly connected to the first slide block 92 for driving the first slide block 92 to move. An air inlet pipe 94 is fixed to the top of the first slide block 92, and the end of the air inlet pipe 94 is connected to a wind pressure mechanism 95 via a corrugated pipe 96 for supplying air into the air inlet pipe 94. When the screening unit 2 rotates to the material drop area 15 under the drive of the driving assembly 13, the air inlet pipe 94 can be directly aligned with the air inlet 261.

[0057] Additionally, refer to Figure 11 A support rod 2631 is vertically fixed to the bottom of the baffle 263. A guide part 921 is partially provided on the first slide 92. The end of the guide part 921 has a guide surface. When the screening unit 2 rotates to the discharge area 15, the guide part 921 can be directly facing the support rod 2631. By controlling the first driving member 93 to move the first slide 92 towards the screening unit 2, the guide surface of the guide part 921 can first abut against the support rod 2631 and force the baffle 263 to move outward, thereby opening the air inlet 261 and the discharge port 262 at the same time. Then, the first slide 92 continues to move towards the screening unit 2, and finally the air inlet pipe 94 can abut against the collection box 26. By controlling the operation of the wind pressure mechanism 95 to send air into the collection box 26, the material on the screen can leave from the discharge port 262 and enter the enzymatic hydrolysis pipe 5.

[0058] Additionally, returning Figure 4 It should be noted that a baffle 265 is provided inside the collection box 26. The baffle 265 is located between the air inlet 261 and the material outlet 262, and the top of the baffle 265 is flush with the top of the collection box 26. When the collection box 26 is against the bottom of the screening cylinder 24, the baffle 265 can also be against the screening cylinder 24, thereby forming a one-way channel inside the collection box 26, so as to deliver air into the collection box 26 and allow the material on the screen to leave the material outlet 262.

[0059] Reference Figure 12The cleaning mechanism 6 includes a cleaning pipe 61 and a water-blocking plate 62. The water-blocking plate 62 is fixedly mounted on the top of the fixed base 11 and located above the rotating base 12. The cleaning pipe 61 is fixedly mounted on the top of the fixed base 11 and located below the rotating base 12. A cleaning zone 16 is formed between the cleaning pipe 61 and the water-blocking plate 62. When the screening unit 2 rotates to the cleaning zone 16, the water-blocking plate 62 can cover the top surface of the housing 21, and the cleaning pipe 61 can be directly facing the screening unit 2.

[0060] A sealing cover 63 is slidably connected to the top of the cleaning pipe 61, and a second elastic pad (not shown in the figure) is adhered to the top of the sealing cover 63. A first lifting member 64 is fixed to the side of the cleaning pipe 61. The first lifting member 64 is a hydraulic cylinder, and its movable end is connected to the sealing cover 63. The first lifting member 64 is in its normally retracted state. By controlling the movement of the first lifting member 64, the sealing cover 63 can move upward and make the second elastic pad abut against the bottom of the receiving box 22. An annular pipe 65 is installed inside the cleaning pipe 61. Multiple high-pressure nozzles 66 are evenly distributed in the annular pipe 65. The high-pressure nozzles 66 can flush the ultrafiltration component, thereby quickly flushing out the powder on the screen that is clogging the screen pores.

[0061] Additionally, refer to Figure 13 A connecting structure 28 is provided between the two sets of screening units 2 located on the diagonal in all screening units 2. The connecting structure 28 enables the screening unit 2 located in the screening zone 14 and the screening unit 2 located in the cleaning zone 16 to vibrate together under the drive of the vibration mechanism 8, so as to improve the thoroughness of screening ultrafiltration tea powder and improve the cleanliness of ultrafiltration components after rinsing.

[0062] Specifically, the center of the rotating seat 12 is provided with a hollow groove 124, and the connecting structure 28 includes a connecting rod 281 passing through the hollow groove 124 and spring self-locking buckles 282 fixed to both ends of the connecting rod 281. In this embodiment, the spring self-locking buckle 282 is set as a self-locking spring buckle, which has the function of locking with one press and unlocking with another press. Its specific structure is known to those skilled in the art and will not be described in detail here. A snap-fit ​​block 224 is fixed on the side of the receiving box 22 near the hollow groove 124. After the housing 21 is installed in the mounting cavity, the snap-fit ​​block 224 can engage with the spring self-locking buckle 282, so that when the vibration mechanism 8 drives the ultrafiltration component of the screening section 14 to vibrate, the ultrafiltration component located in the cleaning section 16 can vibrate together.

[0063] Reference Figure 14The drying mechanism 7 is a hot air dryer fixed to the top of the fixed base 11. The hot air outlet of the hot air dryer is located at the top of the hot air dryer, thus forming a drying zone 17. When the screening unit 2 rotates to the drying zone 17, the hot air dryer can blow out hot air to dry the screening unit 2, so as to facilitate the smooth progress of the next screening operation. It should be noted that the screening unit 2 can pass through the screening zone 14, the material discharge zone 15, the washing zone 16 and the drying zone 17 in sequence under the drive of the drive assembly 13, and finally return to the screening zone 14.

[0064] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A preparation process for highly aromatic and color-protecting ultrafine tea powder, characterized in that, Includes the following steps: Step S1: Select and mix raw materials; Step S2: Instant high-temperature sterilization: Sterilize the tea leaves at 145℃ for 4.5 seconds; Step S3, Vacuum low-temperature drying: The sterilized tea leaves are sent into a vacuum microwave dryer for drying; Step S4, Airflow pulverization and grinding; Step S5, Tea powder sieving: The ultrafine tea powder is sieved through a sieving device, and the qualified ultrafine tea powder after sieving is collected in a collection device, while the sieved material continues to steps S6-S8; The sieving device in step S5 includes a feed pipe (3) for the ultrafine tea powder to enter, a finished product pipe (4) for the undersize material to enter, a sieving mechanism (1) for sieving the ultrafine tea powder, and an enzymatic hydrolysis pipe (5) for collecting the sieved material. The enzymatic hydrolysis pipe (5) is connected to an enzymatic hydrolysis box (52) for the enzymatic hydrolysis operation in step S6; wherein, the sieving mechanism (1) includes a fixed base (11) and a rotating... A rotating seat (12) mounted on a fixed base (11) and a drive assembly (13) for driving the rotating seat (12) to rotate. The rotating seat (12) is circumferentially provided with multiple mounting chambers (122), each of which is equipped with a screening unit (2). The feed pipe (3) is located above the rotating seat (12), and the finished product pipe (4) is located below the rotating seat (12). The feed pipe (3) and the finished product pipe (4) are directly opposite each other and maintain a gap, forming a screening area (14). The screening area (14) is provided with a vibration mechanism (8) for driving the screening unit (2) to vibrate. The enzymatic hydrolysis pipe (5) is located below the rotating seat (12), forming a material drop area (15), and the material drop area (15) is located below the rotating seat (12). 5) A transfer mechanism (9) is provided for transferring the material on the sieve to the enzymatic hydrolysis pipe (5); after the rotating seat (12) rotates, the sieving unit (2) passes through the sieving area (14) and the discharge area (15) in sequence; the sieving unit (2) includes a shell (21) and an ultrafiltration assembly, the shell (21) being matched and installed in the installation chamber (122); the shell (21) is provided with an installation groove (211), the installation groove (211) extending through the upper and lower sides of the shell (21); the ultrafiltration assembly includes a receiving box (22), a first screen (23) and a sieving cylinder (24), the receiving box (22) and the first screen (23) being elastically connected to the inner wall of the installation groove (211), and ... are elastically connected to the inner wall of the installation groove (211), and the receiving box (22) and the first screen (23) are elastically connected to the inner wall of the installation groove (211), and the receiving box (22) and the first screen (23) are elastic 23) are linked together; the first screen (23) is located inside the receiving box (22), and the middle part of the first screen (23) is higher than the peripheral edge of the first screen (23); the sieve cylinder (24) is hung on the bottom of the first screen (23), and there is a material dropping space (27) between the first screen (23) and the inner wall of the receiving box (22) for the screened material to fall into the receiving box (22); the bottom of the receiving box (22) is provided with an annular second screen (25), the bottom of the sieve cylinder (24) is provided with an extension tube (241) extending to the inner side of the second screen (25), and a collection box (26) for collecting the screened material is provided between the sieve cylinder (24) and the extension tube (241), and the top of the collection box (26) is open;Step S51: By introducing airflow into the collection box (26) of the sieving unit (2), the material on the sieve is blown from the collection box (26) to the enzymatic hydrolysis pipe (5) and falls into the enzymatic hydrolysis box (52); Step S52: After the material on the sieve is transferred, the sieving unit (2) is subjected to high-pressure reverse water washing and hot air drying in sequence to remove the tea powder particles clogging the sieve holes and restore the sieve surface to a dry state; Step S6: Enzymatic hydrolysis of the material on the sieve; after adding water and stirring to dissolve, an appropriate amount of enzyme preparation is added, the enzyme preparation being cellulase and pectinase, and the mixture is allowed to stand for enzymatic hydrolysis to form a tea solution; Step S7: Low-temperature spray drying; after the tea solution is dried, a solid powder is formed; Step S8: Mixing; the solid powder is backfilled into the finished ultrafine tea powder and mixed with it.

2. The preparation process according to claim 1, characterized in that: The collection box (26) is partially provided with an air inlet (261) and a material outlet (262). The air inlet (261) is located on the side of the collection box (26), and the material outlet (262) is located at the bottom of the collection box (26). A baffle (263) is slidably connected to the outer side of the collection box (26). A first spring (264) is provided between the baffle (263) and the collection box (26). The first spring (264) is used to force the baffle (263) to normally block the air inlet (261) and the material outlet (262). The transfer mechanism (9) includes a guide seat (91) fixed to the fixed base (11), a first slide (92) slidably disposed on the fixed base (11), and a first driving member (93) for driving the first slide (92) to move. When the screening unit (2) When moving to the material drop area (15), the guide seat (91) forces the collection box (26) to move upward and abut against the bottom of the screening cylinder (24). At this time, the collection box (26) is in a closed state. The top of the first slide (92) is provided with an air inlet pipe (94). The air inlet pipe (94) is directly opposite to the air inlet (261). The air inlet pipe (94) is connected to a wind pressure mechanism (95) for air delivery. The first slide (92) is partially provided with a guide part (921). When the first driving member (93) is activated, the guide part (921) forces the baffle (263) to move outward to open the air inlet (261) and the material drop port (262). Finally, the air inlet pipe (94) abuts against the collection box (26) and is directly connected to the air inlet (261).

3. The preparation process according to claim 1, characterized in that: The mounting groove (211) is provided with a plurality of first hanging rods (212) and a plurality of second hanging rods (213), and each of the first hanging rods (212) and each of the second hanging rods (213) is fitted with a second spring (214); the receiving box (22) is provided with a first ring sleeve (221) on its side, which is used to engage with the first hanging rod (212); the receiving box (22) is provided with a plurality of connecting grooves (222) on its side, and the first screen (23) is provided with a plurality of connecting posts (231) on its side, each of the connecting posts (231) passing through the connecting grooves (222) and partially exposed outside the receiving box (22); the end of the connecting post (231) is provided with a second ring sleeve (232) for engaging with the second hanging rod (213).

4. The preparation process according to claim 1, characterized in that: The screening device is also provided with a cleaning zone (16) and a drying zone (17). After the rotating seat (12) rotates, the screening unit (2) passes through the screening zone (14), the material discharge zone (15), the cleaning zone (16) and the drying zone (17) in sequence. The cleaning zone (16) is provided with a cleaning mechanism (6) for cleaning the screening unit (2), and the drying zone (17) is provided with a drying mechanism (7) for drying the screening unit (2). The screening unit (2) is provided with four groups, and a connecting structure (28) is provided between the two groups of screening units (2) located on the diagonal, so as to realize that the vibration mechanism (8) drives the screening unit (2) located in the screening zone (14) and the screening unit (2) located in the cleaning zone (16) to vibrate together.

5. The preparation process according to claim 4, characterized in that: The connecting structure (28) includes a connecting rod (281) passing through the rotating seat (12) and spring self-locking buckles (282) set at both ends of the connecting rod (281). The receiving box (22) is provided with a snap-fit ​​block (224) on its side. When the housing (21) is installed in the installation chamber (122), the snap-fit ​​block (224) and the spring self-locking buckle (282) are engaged and fastened together.

6. The preparation process according to claim 4, characterized in that: The vibration mechanism (8) includes a second slide (81) slidably disposed above the fixed base (11) and a second driving member (82) for driving the second slide (81) to move. The second slide (81) is located outside the receiving box (22). The side of the second slide (81) near the receiving box (22) is elastically connected to a plug-in post (83). A vibration motor (84) is installed inside the plug-in post (83). The side of the receiving box (22) is provided with a plug-in pipe (223). The plug-in pipe (223) is plugged into and adapted to the plug-in post (83). When the screening unit (2) rotates to the screening section (14), the plug-in pipe (223) and the plug-in post (83) are positioned opposite each other.

7. The preparation process according to claim 4, characterized in that: The cleaning mechanism (6) includes a cleaning pipe (61) disposed below the rotating seat (12) and a water-blocking plate (62) disposed above the rotating seat (12). When the screening unit (2) rotates to the cleaning area (16), the water-blocking plate (62) covers the top surface of the housing (21). A sealing cover (63) is movably connected to the top of the cleaning pipe (61). A first lifting member (64) for driving the sealing cover (63) to rise and fall is connected to the side of the cleaning pipe (61). When the first lifting member (64) moves, the sealing cover (63) matches and abuts against the bottom surface of the receiving box (22). A high-pressure nozzle (66) for spraying water to the ultrafiltration component is provided inside the cleaning pipe (61).

8. The preparation process according to claim 1, characterized in that: The bottom of the enzymatic hydrolysis pipe (5) is provided with a wide opening (51), the top of the enzymatic hydrolysis box (52) is open, and the enzymatic hydrolysis box (52) and the wide opening (51) are detachably connected by a locking fastener (53).

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