Tea leaf de-enzyming and screening device and production method thereof

Abstract

The invention relates to the technical field of tea production, and discloses a tea fixation and screening device and a production method thereof.The tea fixation and screening device comprises a treatment tank, an inner cylinder and an outer cylinder are arranged in the treatment tank, screens are arranged in the inner cylinder from top to bottom at intervals, a microwave fixation mechanism is arranged on the side wall of the inner cylinder, and a guide pipe is arranged in the middle of each screen; a bearing ventilation ring corresponding to the screen is arranged in the outer cylinder; a cooling mechanism is arranged outside the treatment tank; a rotating shaft is arranged in the treatment tank, a blocking ring is arranged on the rotating shaft, and jacking pieces used for driving the inner cylinder and the outer cylinder to synchronously ascend and descend and synchronously vibrate are arranged at the lower end of the rotating shaft. The tea leaves added into the inner barrel are screened by the screen and subjected to fixation treatment under the action of the microwave fixation mechanism, and the tea leaves subjected to fixation and screening are conveyed to the corresponding bearing breathable rings and are cooled under the action of the cooling mechanism, so that the subsequent process is facilitated; therefore, fixation and screening are synchronously carried out, and the subsequent production process is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of tea production, in particular to a tea withering screening device and a production method thereof. Background Art

[0002] White tea belongs to the green tea category and is a high-quality tea. Compared with other green teas, white tea contains higher levels of amino acids and tea polyphenols. The fresh and fragrant taste is the main difference in taste between white tea and other green teas.

[0003] The traditional production process of white tea generally includes: raw materials, withering, stripping, primary baking, cooling, moisture regain, re-baking, etc. Since traditional white tea is mostly hand-fried, there is a lack of complete sets of white tea automated production equipment, which affects the large-scale production and development of the white tea industry. Although some people use the production line and production process of ordinary green tea for production, for example, a tea processing method disclosed in the patent document with announcement number CN106974010B includes the following steps: fresh leaf spreading-withering-rolling-drying. However, in this type of production process, in order to ensure the quality of subsequent tea production, most of them add screening after the withering process, and the tea leaves after the withering and screening process are rolled. However, in the prior art, there is a lack of equipment for simultaneous withering and screening, which makes the tea production process more complicated. Summary of the invention

[0004] The object of the present invention is to provide a tea leaf withering screening device and a production method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A tea leaf withering and screening device comprises a processing tank, wherein a liftable inner cylinder and an outer cylinder rotatably sleeved on the inner cylinder are arranged in the processing tank, funnel-shaped screens are arranged at intervals from top to bottom in the inner cylinder, a microwave withering mechanism for withering the tea leaves on the screen is arranged on the side wall of the inner cylinder, a material guide pipe for guiding the tea leaves on the screen into the inner cylinder is arranged at the middle of the screen, a bearing air-permeable ring for bearing the tea leaves on the corresponding screen is arranged in the outer cylinder corresponding to the screen, a cooling mechanism for conveying cold air into the outer cylinder to cool the tea leaves is arranged outside the processing tank; a feeding hopper for adding tea leaves into the inner cylinder is arranged at the upper end of the processing tank, a rotating shaft rotatable and passing through the material guide pipe is arranged in the processing tank, a blocking ring for blocking the material guide pipe is arranged on the rotating shaft, a lifting member for driving the inner cylinder and the outer cylinder to rise and fall synchronously is arranged at the lower end of the rotating shaft, and a vibrating member for driving the inner cylinder and the outer cylinder to vibrate synchronously is also arranged at the lower end of the rotating shaft.

[0006] Furthermore, a slide groove is provided on the outer wall of the rotating shaft along its axial direction, a sliding block sliding in the slide groove is provided on the blocking ring, a mounting ring located above the corresponding screen is provided on the rotating shaft, and a first spring for driving the blocking ring to fit the upper opening of the guide tube is sleeved on the rotating shaft between the corresponding mounting ring and the blocking ring, and the lifting member drives the inner tube and the outer tube to descend to open the upper opening of the guide tube.

[0007] Furthermore, a cavity with an open lower end is provided at the lower end of the rotating shaft, and limiting grooves are provided on the side walls of the cavity along the axial direction of the rotating shaft; the lifting member includes an inner ring arranged in the cavity and an outer ring sleeved on the outside of the rotating shaft, the outer ring and the inner ring are connected by limiting blocks passing through the corresponding limiting grooves, and lifting rods overlapping the outer ring are evenly distributed on the bottom wall of the inner cylinder, and a threaded rod extending into the cavity to lift the inner ring is threadedly installed on the bottom wall of the processing tank.

[0008] Furthermore, the vibration member includes a protrusion relatively arranged on the upper side wall of the outer ring, and a guide slope is provided on one side wall of the protrusion for the push rod to slide onto the protrusion. The rotation of the rotating shaft is used to drive the outer ring to rotate so that the push rod cooperates with the protrusion to realize the vibration of the inner cylinder.

[0009] Furthermore, a mounting cylinder which is sleeved outside the rotating shaft is provided on the upper side wall of the blocking ring, and spiral blades are arranged along the circumference of the outer side wall of the mounting cylinder. The rotating shaft drives the spiral blades to rotate to turn over the tea leaves on the screen.

[0010] Furthermore, the lower end of the inner cylinder is connected to the bottom wall of the processing tank through a telescopic ring cylinder, and a collecting pipe communicating with the telescopic ring cylinder is provided on the bottom wall of the inner cylinder, and the lower end of the collecting pipe extends out of the bottom end of the processing tank.

[0011] Furthermore, the cooling mechanism includes an air inlet pipe uniformly distributed along the circumference of the processing tank at the bottom end of the outer side of the processing tank, a sliding ring groove is provided on the outer wall of the inner cylinder along its circumference, the inner wall carrying the air permeable ring extends into the corresponding sliding ring groove and is slidably arranged, a bracket is provided at the upper end of the rotating shaft, and a toggle rod that passes through the upper end wall of the outer cylinder is distributed on the bracket.

[0012] Furthermore, a retaining ring is provided at the upper end of the toggle rod, a second spring for driving the outer tube to move downward is sleeved on the toggle rod, and a nut for limiting the downward movement of the outer tube is provided at the lower end of the toggle rod.

[0013] Furthermore, a notch is provided on one side wall of the outer cylinder corresponding to the bearing air-permeable ring, and an openable and closable side door is provided on the outer side wall of the processing tank corresponding to the notch.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention, through the arrangement of the inner cylinder, the screen, the microwave fixing mechanism, the outer cylinder, the bearing air-permeable ring and the cooling mechanism, enables the tea leaves added into the inner cylinder to be screened by the screen and fixed under the action of the microwave fixing mechanism, and the tea leaves after fixing and screening are transported to the corresponding bearing air-permeable ring so that they are cooled and cooled under the action of the cooling mechanism so as to carry out the subsequent process; thereby, the simultaneous fixing and screening are realized, and the subsequent production process is simplified.

[0015] 2. The present invention, through the arrangement of the lifting member and the vibrating member, drives the inner cylinder and the outer cylinder to rise and fall synchronously through the lifting member to realize the opening and closing of the material guide tube, thereby realizing the switching between the withering treatment and the cooling treatment. At the same time, the inner cylinder and the outer cylinder are driven to vibrate through the vibrating member, so that the tea leaves are turned over, thereby promoting the effects of the withering treatment and the cooling treatment.

[0016] The present invention also provides a tea production method, which specifically comprises the following steps: S1. Fresh leaf spreading: Spread the picked fresh tea leaves on a spreading machine for spreading. The spreading temperature is controlled at 20-26°C and the spreading time is controlled at 3-4h. S2, withering, screening and cooling: using the above-mentioned production device to wither, screen and cool the tea leaves treated in step S1; S3, rolling: using an automated rolling machine to roll the tea leaves processed in step S2; S4, deblocking: using a tea block deblocking machine to deblock the tea leaves processed in step S3; S5, initial drying: using a dryer to dry the tea leaves after deblocking at high temperature; S6, moisture regain: using a multi-layer moisture regain machine to perform moisture regain treatment on the tea leaves treated in step S5; S7, re-drying: using a dryer to perform low-temperature slow drying on the tea leaves treated in step S6; S8, finished product: cooling the tea leaves in step S7 to obtain finished tea leaves.

[0017] The tea production method can screen the tea leaves during the withering treatment by using the production device, simplifying the production process and thus ensuring the quality of the white tea; the multi-layer moisture conditioning machine is adopted to better ensure the uniform moisture content inside the tea leaves and guarantee the uniformity of drying; the initial baking is carried out by using a high-temperature roughening fire to promote the aroma of the tea leaves, and the secondary baking is carried out by using a low-temperature slow baking method, which can further enhance the aroma of the tea leaves while ensuring the moisture content of the tea leaves, thereby making the quality of the prepared tea leaves more superior. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1The present invention is a schematic diagram of the structure of a tea leaf withering and screening device.

[0019] Figure 2 This is one of the cross-sectional schematic diagrams of a tea leaf withering and screening device in the present invention.

[0020] Figure 3 This is the second structural schematic diagram of the processing tank when the side door is opened in the present invention.

[0021] Figure 4 for Figure 2 Enlarged schematic diagram of part A.

[0022] Figure 5 It is a schematic diagram of the half-section structure of the inner cylinder in the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the outer cylinder in the present invention.

[0024] Figure 7 It is a schematic diagram of the explosion structure at the lower end of the rotating shaft in the present invention.

[0025] The meanings of the numbers in the figure are as follows: 100, treatment tank; 101, feed hopper; 102, support legs; 103, top cover; 110, motor; 120, air intake pipe; 130, side door; 210, inner cylinder; 220, outer cylinder; 221, notch; 230, screen; 231, guide pipe; 232, discharge pipe; 240, load-bearing air ring; 250, rotating shaft; 251, bracket; 252, toggle rod; 253, nut; 260, push rod; 270, threaded rod; 271, hand wheel; 280, telescopic ring; 290, collecting pipe; 401, slide groove; 402, mounting ring; 410, blocking ring; 411, mounting cylinder; 412, spiral blade; 420, first spring; 501, sliding ring groove; 510, retaining ring; 520, second spring; 701, cavity; 702, limiting groove; 710, inner ring; 720, outer ring; 721, protrusion; 722, guiding slope. DETAILED DESCRIPTION

[0026] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0027] Combined with Figure 1-Figure 7 As shown, this embodiment provides a tea leaf withering and screening device, which can be used to wither and screen tea leaves and to cool the withered tea leaves so that the tea leaves can be processed in subsequent production.

[0028] like Figure 1 and Figure 2 As shown, a tea leaf fixing and screening device in this embodiment includes a processing tank 100, wherein a liftable inner cylinder 210 and an outer cylinder 220 rotatably sleeved outside the inner cylinder 210 are provided in the processing tank 100, funnel-shaped screens 230 are arranged from top to bottom in the inner cylinder 210, a microwave fixing mechanism for fixing the tea leaves on the screen 230 is arranged on the side wall of the inner cylinder 210, a guide pipe 231 for guiding the tea leaves on the screen 230 into the inner cylinder 210 is arranged at the middle of the screen 230, and a carrying air-permeable ring 232 for carrying the tea leaves on the corresponding screen 230 is arranged in the outer cylinder 220 corresponding to the screen 230 40. A cooling mechanism is provided outside the processing tank 100 for conveying cold air into the outer cylinder 220 to cool the tea leaves; a feeding hopper 101 is provided at the upper end of the processing tank 100 for adding tea leaves into the inner cylinder 210; a rotating shaft 250 is provided inside the processing tank 100 and passes through the material guide pipe 231; a blocking ring 410 is provided on the rotating shaft 250 for sealing the material guide pipe 231; a lifting member is provided at the lower end of the rotating shaft 250 for driving the inner cylinder 210 and the outer cylinder 220 to rise and fall synchronously; a vibrating member is also provided at the lower end of the rotating shaft 250 for driving the inner cylinder 210 and the outer cylinder 220 to vibrate synchronously.

[0029] In actual use of this embodiment, the top of the processing tank 100 is opened, and a top cover 103 is provided at the opening. The bottom wall of the processing tank 100 is provided with a support leg 102 for supporting the processing tank 100, so as to facilitate the installation of the lifting member on the bottom wall of the processing tank 100. The feed hopper 101 is fixedly mounted on the top cover 103. When in actual use, the tea leaves to be treated with green tea are added into the feed hopper 101, and the tea leaves can be added into the inner cylinder 210 from the upper opening of the inner cylinder 210 and stacked on the top screen 230. The microwave green tea-killing mechanism is an existing structure, which can adopt the structure disclosed in the patent with the announcement number CN112273458B, and can perform green tea-killing treatment on the tea leaves stacked on the screen 230. Specifically, the number of the screens 230 in this embodiment is preferably three, and a plurality of microwave tea-fixing mechanisms are provided on the side wall of the inner cylinder 210 corresponding to the number of the screens 230. The screens 230 can screen the tea leaves, that is, the sieve holes on the three screens 230 in this embodiment gradually decrease from top to bottom, thereby allowing the tea leaves added to the inner cylinder 210 to be screened at multiple levels, wherein the screens 230 are funnel-shaped, so that the tea leaves on the screens 230 will gradually accumulate at the guide pipe 231, so that the guide pipe 231 can transport the tea leaves after tea-fixing treatment to the outer cylinder 220; In actual use, a discharge pipe 232 is provided on the side wall of the guide pipe 231 for guiding the tea leaves entering the guide pipe 231 into the outer cylinder 220. The discharge pipe 232 is tilted so as to transport the tea leaves to the corresponding bearing air-permeable ring 240. When the lifting member drives the inner cylinder 210 and the outer cylinder 220 to move upward synchronously, the blocking ring 410 can block the corresponding guide pipe 231. At this time, the tea leaves are piled on the corresponding screen 230, so that they are treated by the microwave tea-wiping mechanism. When the lifting member drives the inner cylinder 210 and the outer cylinder 220 to move downward, the blocking ring 410 is moved away from the corresponding material guide pipe 231, and the material guide pipe 231 is opened. At this time, the tea leaves on the screen 230 that have been treated with withering can fall onto the corresponding supporting air ring 240 through the material guide pipe 231 and the unloading pipe 232. At this time, cold air can be transported into the outer cylinder 220 through the cooling mechanism, so that the tea leaves on the supporting air ring 240 can be cooled down, thereby facilitating the subsequent production processing of the tea leaves after withering.

[0030] Among them, through the setting of the vibration component, when the blocking ring 410 blocks the guide pipe 231, it can drive the inner cylinder 210 and the outer cylinder 220 to vibrate synchronously, so that the tea leaves on the screen 230 are turned over, thereby improving its withering effect; when the blocking ring 410 releases the blockage of the guide pipe 231, at this time, the vibration component drives the inner cylinder 210 and the outer cylinder 220 to vibrate synchronously, which can better transport the tea leaves on the screen 230 to the bearing air ring 240 through the guide pipe 231 and the unloading pipe 232, thereby promoting the effect of transporting the tea leaves to the bearing air ring 240; at the same time, when the tea leaves are transported to the bearing air ring 240 for cooling, the vibration component drives the inner cylinder 210 and the outer cylinder 220 to vibrate synchronously, which can turn the tea leaves on the bearing air ring 240, thereby accelerating its cooling effect.

[0031] Combination Figure 4 As shown, in this embodiment, a slide groove 401 is provided on the outer wall of the rotating shaft 250 along its axial direction, a slider sliding in the slide groove 401 is provided on the blocking ring 410, a mounting ring 402 located above the corresponding screen 230 is provided on the rotating shaft 250, and a first spring 420 for driving the blocking ring 410 to fit the upper end opening of the guide tube 231 is sleeved on the rotating shaft 250 located between the corresponding mounting ring 402 and the blocking ring 410, and the lifting member drives the inner cylinder 210 and the outer cylinder 220 to descend to realize the opening of the upper end of the guide tube 231.

[0032] In this embodiment, a keyway is formed between the blocking ring 410 and the rotating shaft 250 through the coordinated setting of the slider and the slide groove 401, so that the rotation of the rotating shaft 250 can drive the blocking ring 410 to rotate; wherein, the first spring 420 can drive the blocking ring 410 to move downward, so that the blocking ring 410 moves to the lowermost end of the corresponding slide groove 401. At this time, when the lifting member drives the inner cylinder 210 and the outer cylinder 220 to move upward, the guide tube 231 can move upward and fit with the corresponding blocking ring 410, so that the guide tube 231 is closed, that is, the tea leaves can be accumulated on the screen 230 and be treated with withering; when the lifting member drives the inner cylinder 210 and the outer cylinder 220 to move downward, the guide tube 231 moves downward and away from the blocking ring 410, so that the guide tube 231 is opened. At this time, the tea leaves on the screen 230 that have been treated with withering can be added to the corresponding load-bearing air-permeable ring 240 through the guide tube 231, so that the tea leaves can be cooled and cooled.

[0033] Combination Figure 5-7 As shown, in this embodiment, a cavity 701 with an opening at the lower end is provided at the lower end of the rotating shaft 250, and a limiting groove 702 is provided on the side wall of the cavity 701 along the axial direction of the rotating shaft 250; the lifting member includes an inner ring 710 arranged in the cavity 701 and an outer ring 720 sleeved on the outside of the rotating shaft 250, and the outer ring 720 and the inner ring 710 are connected by a limiting block passing through the corresponding limiting groove 702, and the bottom wall of the inner cylinder 210 is evenly provided with a push rod 260 overlapped on the outer ring 720, and the bottom wall of the processing tank 100 is threadedly installed with a threaded rod 270 extending into the cavity 701 to lift the inner ring 710.

[0034] In this embodiment, through the above structure, under the action of the first spring 420, the push rod 260 can be preferably abutted against the upper side wall of the outer ring 720. At this time, the threaded rod 270 can be threadedly rotated to allow the threaded rod 270 to extend into the cavity 701, thereby enabling the inner ring 710 to be lifted and lowered in the cavity 701, and then the outer ring 720 is lifted and lowered through the limit block, so that the inner cylinder 210 and the outer cylinder 220 can be lifted and lowered synchronously; In order to facilitate the operator to rotate the threaded rod 270, a hand wheel 271 is provided at the lower end of the threaded rod 270, thereby facilitating the synchronous lifting and lowering operation of the inner cylinder 210 and the outer cylinder 220.

[0035] In this embodiment, the vibration member includes a protrusion 721 arranged on the upper side wall of the outer ring 720, and a guide slope 722 is provided on one side wall of the protrusion 721 for allowing the push rod 260 to slide onto the protrusion 721. The rotation of the rotating shaft 250 is used to drive the outer ring 720 to rotate so that the push rod 260 cooperates with the protrusion 721 to realize the vibration of the inner cylinder 210.

[0036] In this embodiment, the stop groove 702 and the stop block are matched so that the rotation of the shaft 250 can drive the outer ring 720 to rotate, thereby driving the protrusion 721 to rotate and move, so that it cooperates with the ejector rod 260; Among them, one side wall of the protrusion 721 forms a guiding inclined surface 722, and the other side is a vertical side wall. At this time, the rotation of the rotating shaft 250 can drive the guiding inclined surface 722 to squeeze the push rod 260 so that the push rod 260 slides onto the protrusion 721, thereby causing the inner cylinder 210 and the outer cylinder 220 to move upward synchronously. When the protrusion 721 continues to rotate, the push rod 260 can hit the outer ring 720 along the vertical side wall of the protrusion 721, thereby causing the outer ring 720 to continue to rotate, which can better cause the inner cylinder 210 and the outer cylinder 220 to vibrate; Among them, when the blocking ring 410 is in contact with the guide tube 231 to seal the guide tube 231, at this time, under the action of the first spring 420, the vibration member drives the inner tube 210 and the outer tube 220 to vibrate, and the guide tube 231 is always in a closed state; when the blocking ring 410 is away from the guide tube 231 to open the guide tube 231, at this time, the vibration member drives the inner tube 210 and the outer tube 220 to vibrate, and the guide tube 231 is always in an open state, so that the tea leaves can be transported into the outer tube 220. Specifically, in this embodiment, a motor 110 for driving the rotating shaft 250 to rotate is disposed on the top cover 103 , so that the vibration member drives the inner cylinder 210 and the outer cylinder 220 to vibrate.

[0037] In this embodiment, a mounting cylinder 411 which is sleeved outside the rotating shaft 250 is provided on the upper side wall of the blocking ring 410, and spiral blades 412 are arranged along the circumference of the outer wall of the mounting cylinder 411. The rotating shaft 250 drives the spiral blades 412 to rotate to turn over the tea leaves on the screen 230.

[0038] In this embodiment, through the above-mentioned structure, the rotation of the rotating shaft 250 can drive the blocking ring 410 to rotate, and can drive the spiral blade 412 to rotate, and can transport the tea leaves accumulated at the blocking ring 410 upward through the spiral blade 412, so that the tea leaves are turned over, thereby promoting the withering effect of the tea leaves.

[0039] In this embodiment, the lower end of the inner cylinder 210 is connected to the bottom wall of the processing tank 100 through the telescopic ring cylinder 280. A collecting pipe 290 connected to the telescopic ring cylinder 280 is provided on the bottom wall of the inner cylinder 210, and the lower end of the collecting pipe 290 extends out of the bottom end of the processing tank 100.

[0040] In actual use of this embodiment, the broken tea leaves after being screened by the screen 230 at multiple levels fall to the bottom end of the inner cylinder 210 and are collected, wherein the telescopic ring cylinder 280 is in the shape of a corrugated ring cylinder so that it can be telescopic, and its upper end is fixedly connected to the bottom end of the inner cylinder 210, and its lower end is fixedly connected to the bottom wall of the processing tank 100, thereby realizing the lifting installation of the inner cylinder 210 in the processing tank 100, so that it will not rotate in the circumferential direction; Among them, through the setting of the collecting pipe 290, the broken tea at the bottom of the inner cylinder 210 can be discharged out of the processing tank 100 through the collecting pipe 290. Specifically, there are multiple collecting pipes 290 distributed along the circumference of the inner cylinder 210, all of which are located in the telescopic ring cylinder 280 and extend out of the bottom wall of the processing tank 100, and a switch valve is provided on the collecting pipe 290, thereby, the broken tea at the bottom of the inner cylinder 210 can be better discharged.

[0041] In this embodiment, the cooling mechanism includes an air inlet pipe 120 uniformly distributed along the circumference of the processing tank 100 at the outer bottom end of the processing tank 100, a sliding ring groove 501 is provided on the outer wall of the inner cylinder 210 along its circumference, and the inner wall of the supporting air ring 240 extends into the corresponding sliding ring groove 501 for sliding arrangement, and a bracket 251 is provided at the upper end of the rotating shaft 250, and a toggle rod 252 is distributed on the bracket 251 and passes through the upper end wall of the outer cylinder 220.

[0042] In this embodiment, the outer wall of the outer cylinder 220 and the inner wall of the processing tank 100 are slidably and tightly matched, and the outer cylinder 220 can be rotatably mounted on the outer wall of the inner cylinder 210 through the arrangement of the sliding ring groove 501 and the bearing air-permeable ring 240; The cooling mechanism further includes a refrigeration component and a cold air delivery pipe connecting the air inlet pipe 120 and the refrigeration component, wherein the refrigeration component is of an existing structure, which can prepare cold air and deliver the cold air to the air inlet pipe 120 through the cold air delivery pipe, thereby enabling the cooling mechanism to deliver cold air to the outer cylinder 220, wherein the telescopic ring cylinder 280 can separate the cold air, so that the cold air flows upward and is discharged out of the processing tank 100 through the bearing air ring 240 and the feed hopper 101, so that the tea leaves on the bearing air ring 240 are cooled and cooled; at this time, the vibration member drives the outer cylinder 220 to vibrate, which can better achieve the vibration of the tea leaves on the bearing air ring 240 to improve its cooling and cooling effect; Among them, through the arrangement of the bracket 251 and the toggle rod 252, the toggle rod 252 passes through the top of the outer cylinder 220, so that the rotating shaft 250 rotates through the bracket 251 and the toggle rod 252 to rotate the outer cylinder 220, and preferably the tea leaves transported to the corresponding supporting air ring 240 through the discharge pipe 232 are spread flat on the supporting air ring 240, and cooperate with the vibration of the inner cylinder 210 and the outer cylinder 220, so that the tea leaves are preferably cooled and cooled.

[0043] In this embodiment, in order to better enable the vibration member to drive the inner cylinder 210 and the outer cylinder 220 to perform a relatively stable lifting and lowering to generate vibration when the inner cylinder 210 and the outer cylinder 220 move downward to open the guide tube 231, a retaining ring 510 is provided at the upper end of the toggle rod 252, and a second spring 520 for driving the outer cylinder 220 to move downward is sleeved on the toggle rod 252, and a nut 253 for limiting the downward movement of the outer cylinder 220 is provided at the lower end of the toggle rod 252. The second spring 520 is used to drive the top end of the outer cylinder 220 to move downward, so that the rotation of the rotating shaft 250 can drive the inner cylinder 210 and the outer cylinder 220 to generate stable vibration.

[0044] In this embodiment, a notch 221 is provided on one side wall of the outer cylinder 220 corresponding to the air-permeable ring 240 , and an openable and closable side door 130 is provided on the outer side wall of the processing tank 100 corresponding to the notch 221 .

[0045] Through the construction in this embodiment, in actual use, the side door 130 is fixed to the side wall of the processing tank 100 by bolts. When the side door 130 is opened, the outer cylinder 220 can be rotated to make the groove 221 correspond to the side door 130, thereby facilitating the removal of the tea leaves after the cooling treatment on the air-permeable ring 240 so that the tea leaves can be processed in subsequent production.

[0046] This embodiment also provides a tea production method, which specifically comprises the following steps: S1. Fresh leaf spreading: Spread the picked fresh tea leaves on a spreading machine for spreading. The spreading temperature is controlled at 20-26°C and the spreading time is controlled at 3-4h. S2, withering, screening and cooling: using the above-mentioned production device to wither, screen and cool the tea leaves treated in step S1; S3, rolling: using an automated rolling machine to roll the tea leaves processed in step S2; S4, deblocking: using a tea block deblocking machine to deblock the tea leaves processed in step S3; S5, initial drying: using a dryer to dry the tea leaves after deblocking at high temperature; S6, moisture regain: using a multi-layer moisture regain machine to perform moisture regain treatment on the tea leaves treated in step S5; S7, re-drying: using a dryer to perform low-temperature slow drying on the tea leaves treated in step S6; S8, finished product: cooling the tea leaves in step S7 to obtain finished tea leaves.

[0047] The tea production method can screen the tea leaves during the withering treatment by using the production device, simplifying the production process and thus ensuring the quality of the white tea; the multi-layer moisture conditioning machine is adopted to better ensure the uniform moisture content inside the tea leaves and guarantee the uniformity of drying; the initial baking is carried out by using a high-temperature roughening fire to promote the aroma of the tea leaves, and the secondary baking is carried out by using a low-temperature slow baking method, which can further enhance the aroma of the tea leaves while ensuring the moisture content of the tea leaves, thereby making the quality of the prepared tea leaves more superior.

[0048] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A tea leaf withering and screening device, comprising a processing tank (100), characterized in that: A processing tank (100) is provided with a liftable inner cylinder (210) and an outer cylinder (220) rotatably sleeved on the outer side of the inner cylinder (210); funnel-shaped screens (230) are arranged in intervals from top to bottom in the inner cylinder (210); a microwave de-greening mechanism for de-greening tea leaves on the screen (230) is provided on the side wall of the inner cylinder (210); a guide tube (231) for guiding the tea leaves on the screen (230) into the inner cylinder (210) is provided at the middle of the screen (230); a carrying ventilating ring (240) for carrying the tea leaves on the corresponding screen (230) is provided in the outer cylinder (220); and a microwave de-greening mechanism for de-greening tea leaves on the screen (230) is provided on the outer side of the processing tank (100). A cooling mechanism is provided for conveying cold air into the outer cylinder (220) to cool the tea leaves; a feeding hopper (101) for feeding tea leaves into the inner cylinder (210) is provided at the upper end of the processing tank (100); a rotating shaft (250) is provided in the processing tank (100) and is rotatable and passes through the material guide pipe (231); a blocking ring (410) is provided on the rotating shaft (250) for blocking the material guide pipe (231); a lifting member for driving the inner cylinder (210) and the outer cylinder (220) to rise and fall synchronously is provided at the lower end of the rotating shaft (250); and a vibrating member for driving the inner cylinder (210) and the outer cylinder (220) to vibrate synchronously is also provided at the lower end of the rotating shaft (250).

2. A tea leaf withering screening device according to claim 1, characterized in that: A slide groove (401) is provided on the outer wall of the rotating shaft (250) along its axial direction, a slider sliding in the slide groove (401) is provided on the blocking ring (410), a mounting ring (402) located above the corresponding screen (230) is provided on the rotating shaft (250), and a first spring (420) for driving the blocking ring (410) to fit the upper opening of the guide tube (231) is sleeved on the rotating shaft (250) between the corresponding mounting ring (402) and the blocking ring (410), and the lifting member drives the inner tube (210) and the outer tube (220) to descend to open the upper opening of the guide tube (231).

3. A tea leaf withering screening device according to claim 2, characterized in that: A cavity (701) with an opening at the lower end is provided at the lower end of the rotating shaft (250), and limiting grooves (702) are provided on the side walls of the cavity (701) along the axial direction of the rotating shaft (250); the lifting member comprises an inner ring (710) provided in the cavity (701) and an outer ring (720) sleeved on the outside of the rotating shaft (250), and the outer ring (720) and the inner ring (710) are connected via limiting blocks penetrating the corresponding limiting grooves (702); lifting rods (260) overlapped on the outer ring (720) are evenly distributed on the bottom wall of the inner cylinder (210), and a threaded rod (270) extending into the cavity (701) to lift the inner ring (710) is threadedly installed on the bottom wall of the processing tank (100).

4. The tea leaf withering screening device according to claim 3, characterized in that: The vibration member comprises a protrusion (721) disposed on the upper side wall of the outer ring (720), and a guide inclined surface (722) for allowing the push rod (260) to slide onto the protrusion (721) is disposed on one side wall of the protrusion (721). The rotation of the rotating shaft (250) is used to drive the outer ring (720) to rotate so that the push rod (260) cooperates with the protrusion (721) to realize the vibration of the inner cylinder (210).

5. The tea leaf withering screening device according to claim 2, characterized in that: The upper side wall of the blocking ring (410) is provided with a mounting cylinder (411) sleeved outside the rotating shaft (250), and the outer side wall of the mounting cylinder (411) is provided with spiral blades (412) along its circumference, and the rotating shaft (250) drives the spiral blades (412) to rotate so as to turn over the tea leaves on the screen (230).

6. The tea leaf withering screening device according to claim 5, characterized in that: The lower end of the inner cylinder (210) is connected to the bottom wall of the processing tank (100) via a telescopic ring cylinder (280), and a collecting pipe (290) communicating with the inside of the telescopic ring cylinder (280) is provided on the bottom wall of the inner cylinder (210), and the lower end of the collecting pipe (290) extends out of the bottom end of the processing tank (100).

7. The tea leaf withering screening device according to claim 1, characterized in that: The cooling mechanism comprises an air inlet pipe (120) uniformly distributed along the circumference of the processing tank (100) at the outer bottom end of the processing tank (100); a sliding ring groove (501) is provided on the outer wall of the inner cylinder (210) along its circumference; the inner wall of the bearing air permeable ring (240) extends into the corresponding sliding ring groove (501) for sliding arrangement; a bracket (251) is provided at the upper end of the rotating shaft (250); and a toggle rod (252) is distributed on the bracket (251) and passes through the upper end wall of the outer cylinder (220).

8. The tea leaf withering screening device according to claim 7, characterized in that: A retaining ring (510) is provided at the upper end of the toggle rod (252), a second spring (520) for driving the outer cylinder (220) to move downward is sleeved on the toggle rod (252), and a nut (253) for limiting the downward movement of the outer cylinder (220) is provided at the lower end of the toggle rod (252).

9. The tea leaf withering screening device according to claim 8, characterized in that: A notch (221) is provided on one side wall of the outer cylinder (220) corresponding to the bearing air-permeable ring (240), and an openable and closable side door (130) is provided on the outer side wall of the processing tank (100) corresponding to the notch (221).

10. A tea production method, comprising the tea withering screening device according to any one of claims 1 to 9, characterized in that: The specific steps include: S1. Fresh leaf spreading: Spread the picked fresh tea leaves on a spreading machine for spreading. The spreading temperature is controlled at 20-26°C and the spreading time is controlled at 3-4h. S2, withering, screening and cooling: the tea leaves treated in step S1 are withered, screened and cooled by the production device; S3, rolling: using an automated rolling machine to roll the tea leaves processed in step S2; S4, deblocking: using a tea block deblocking machine to deblock the tea leaves processed in step S3; S5, initial drying: using a dryer to dry the tea leaves after deblocking at high temperature; S6, moisture regain: using a multi-layer moisture regain machine to perform moisture regain treatment on the tea leaves treated in step S5; S7, re-drying: using a dryer to perform low-temperature slow drying on the tea leaves treated in step S6; S8, finished product: cooling the tea leaves in step S7 to obtain finished tea leaves.

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