Mass and continuous production process of selenium-enriched organic green tea

[0032] In order to make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the protection scope of the specific claim of the present invention. The "core wire" mentioned below refers to the center line of the component.

[0033] The invention provides a green tea production equipment, such as figure 1 As shown, it includes a spreading device G1 for spreading tea leaves, a bronzing device 10 for broiling tea, and a drying device 20 for drying the tea. Tumbler curing device G2 for primary curing of tea, first cooling device T1 for primary cooling of tea, microwave curing device W10 for secondary curing of tea, used for secondary cooling of tea The second cooling device T2 for cooling the tea is used for the first sorting machine G3 for the first-level sorting of tea, and the third cooling device T3 for the third-level cooling of the tea is used for the second cooling of the tea. The second sorting machine G4 for classifying the tea, the fourth cooling device T4 for four-stage cooling of the tea, and the first drying device G5 for the first-stage drying of the tea, for spraying the tea The organic selenium solution spraying device T5, the second drying device G6 for two-stage drying of tea, and the sixth cooling device T6 for six-stage cooling of tea, which is used for refrigerating and curing the tea The refrigerating room G7 and the flavoring machine G8 used to enhance the fragrance of tea; the first, second, third, fourth, and sixth cooling devices are all made of bamboo screens. The drum finishing device G2, the first and second slicing machines, the first and second drying devices, the flavoring machine, and the cold room can all be used with the existing tea machine equipment with the same function, and the tea transportation between adjacent devices can be used Conveyor belt and/or manual transportation; the spraying device T5 can be a general spraying device, so that the organic selenium solution can be evenly sprayed on the surface of the tea. Through the combined use of the microwave curing device W10 and the roller curing device G2, the tea is cleaned and the primary curing is performed when the tea is blanched, and the color of the tea is fixed; the roller curing is used for the short-term first-level curing to form the aroma of the tea and promote non-enzymatic chemistry The reaction improves the quality of the tea soup, making the tea soup mellow and refreshing, and at the same time, the tea aroma develops into a chestnut aroma; the microwave curing is used for secondary curing, which is used for tea color improvement and color retention, so that the color of the finished tea is green and bright. The specific use of microwave curing device such as figure 2 As shown, the third box body is included. The upper and lower conveyor belts W11a and W11b are arranged vertically and horizontally. The conveying directions of the upper and lower conveyor belts W11a and W11b are opposite. The feeding end of the upper conveyor belt W11a The discharge end of the lower conveyor belt W11b is located outside the same end of the third box, the discharge end of the upper conveyor belt W11a and the feed end of the lower conveyor belt W11b are located inside the third box, and the lower conveyor belt W11b The feed end extends to the outside of the discharge end of the upper conveyor belt W11a. The third box body is provided with a horizontally arranged air collecting plate W13 and an air distribution plate W14. The air collecting plate W13 is located on the upper side of the upper conveyor belt W11a, and the air distribution plate W14 is located below. On the lower side of the conveyor belt W11b, the air collecting plate W13 and the air distribution plate W14 are composed of perforated plates, a microwave generator W12 is arranged between the upper and lower conveyor belts W11a and W11b, the upper top wall and the lower bottom wall of the third box body The air collection port W15 and the air supply port W16 are respectively arranged on the upper side, and the air collection port W15 and the air supply port W16 are connected by an air duct, and the air duct is provided with a dehumidifier and a third fan. Since the moisture in the tea leaves will be released during microwave curing, a third fan is set to extract and remove the generated water vapor, and at the same time, the dried hot air is sent to the third box to save energy and increase the dehydration rate of the tea. . The upper and lower conveyor belts are made of food-grade plastic mesh belts to avoid microwave absorption and ensure food safety.

[0034] In addition, the outer side of the discharge end of the upper conveyor belt W11a is provided with an obliquely arranged turning plate W18. The height of the turning plate W18 near one end of the upper conveyor belt W11a is less than the height of the other end. The turning plate W18 and tea leaves are discharged on the upper conveyor belt W11a. The falling paths of the material ends are arranged intersectingly, and the lower end of the turning plate W18 is located inside the lower conveyor belt W11b and is arranged in an isolated manner from the conveying surface of the lower conveyor belt W11b. Although microwave curing can evenly heat the tea leaves, the lower part of the tea leaves is attached to the conveyor belt, so that the water vapor evaporated from the lower part of the tea leaves cannot be quickly dispersed. Therefore, upper and lower conveyor belts W11a, W11b and turning plates W18 are installed. When the tea leaves are transferred between the upper and lower conveyor belts W11a and W11b, the tea leaves are reversed, so that the upper and lower sides of the tea can be adjusted to ensure that the evaporated water vapor of the tea can be effectively dispersed, and the water on the conveyor belt will not affect the quality of the tea. And enhance the microwave effect of tea. Preferably, the inclination angle of the turning plate W18 is set to 45-60°, and the distance between the lower end of the turning plate W18 and the conveying surface of the lower conveyor belt W11b is 2.5 to 3.5 cm. Secondly, the discharge end of the upper conveyor belt W11a is also provided with an air pipe W17. The upper conveyor belt W11a includes an upper conveyor belt body and a lower conveyor belt body. The air pipe W17 is located between the upper and lower conveyor belt bodies and the air pipe conveys along the upper The width of the belt W11a is set. The air pipe W17 is connected with the air jet device. The air pipe body of the air pipe W17 is provided with air nozzles for air jets. The blowing direction of the air nozzles is diagonally downward and points to the one near the turning plate W18. side. The setting of the wind pipe W17 can make the tea leaves on the upper conveyor belt fall onto the lower conveyor belt. Secondly, it can promote the effect of tea turning, and try to ensure that all tea leaves are turned over.

[0035] Hot green device 10 such as image 3 , 4 As shown, it includes a hopper 12 for adding tea leaves and a frame 11 on which the hopper 12 is arranged vertically. The bottom inner wall of the hopper 12 is a hemispherical arc surface, and the center of curvature of the arc surface is located at the mouth of the hopper. On the side, the lowest part of the arc-shaped surface is provided with a discharge interface 122a. The hopper 12 is fixed on the frame 11 by rotating around its core. The hopper 12 is connected with a first driving mechanism that drives it to rotate. The mouth of the hopper 12 is provided There is a hot water pipe 121. The hot water pipe 121 is composed of an inverted conical spiral tube body. The lower end of the hot water pipe 121 is plugged. The lower section of the hot water pipe 121 is inserted in the hopper 12 and the hot water pipe 121 is located The pipe body in the hopper 12 is provided with water outlet holes 121a at intervals. The water outlet direction of the water outlet hole 121a is obliquely downward pointing to the inner wall surface of the hopper 12. The lower side of the hopper 12 is provided with a hot green conveying pipe 13, and the upper end of the hot green conveying pipe 13 and The discharging interface 122a is connected with the core wire of the hopper 12 to form a rotating mating connection. The hot green delivery pipe 13 and the hot water pipe 121 are fixed on the frame, and the upper end of the hot water pipe 121 is connected to the hot water tank. The adjacent upper and lower water outlet holes 121a are arranged in a staggered pattern.

[0036] In the bronzing device 10, the tea leaves are put into the hopper 12, and the first driving mechanism drives the hopper 12 to rotate together, so that the tea leaves falling into the hopper 12 will spirally flow out from the discharge interface 122a together with the hot water into the bronzing conveyor. Tube 13, tea leaves will not stay in the hopper 12, to ensure that all tea can quickly enter the hot green conveying pipe 13, and each piece of tea entering the hot green conveying pipe 13 is surrounded by hot water evenly for blanching, thereby improving the bronzing effect In order to shorten the bronzing time, using the bronzing machine to bronz the tea leaves, the time for bronzing the tea leaves is only 50~60s, so as to avoid the excessive and under bronzing of the tea, improve the color of the tea and avoid tea polyphenols. The dissolution of substances improves the quality of the tea; at the same time, the tea is cleaned thoroughly.

[0037] The hot-greening time of tea leaves can be controlled by setting the length of the hot-green delivery pipe 13 and the flow rate of the hot water. The hot water injection flow rate in the hopper 12 is consistent with the optimal delivery flow rate in the hot-green delivery pipe 13. The tea leaves and hot water coming out from the lower end of the hot green conveying pipe 13 are separated by a conveying mesh belt (screen), and the tea leaves are quickly dried after separation for the next operation.

[0038] A further solution is that the hot green conveying pipe 13 is composed of a spiral insulation pipe, such as Figure 5 Shown. The spiral heat preservation tube can reduce the length of the hot green conveying pipe 13 and prevent tea leaves from being blocked in the hot green conveying pipe 13. In addition, a support plate can be provided on the outer peripheral wall of the hopper 12, the support plate is fixed on the frame 11, and the support plate is connected to the frame 11 through a ball connecting piece to form a rotational fit connection. The first drive mechanism can be a motor, and the hopper 12 passes The belt is connected with a motor, and the motor drives the hopper 12 to rotate.

[0039] For the drying device 20, the technical solutions adopted are such as Image 6 , 7 8. As shown in 8, the drying device 20 includes a horizontally arranged conveyor mesh belt. The feed end of the conveyor mesh belt is arranged corresponding to the discharge nozzle 131 at the lower end of the bronzing conveying pipe 13, and the bronzing conveying pipe 13 is arranged with the conveying mesh belt. A cloth piece 24 is arranged in between to make the tea leaves fall evenly on the conveyor belt along the belt width direction of the conveyor belt. The middle of the conveyor belt is located in the wind box 25. The conveyor belt includes upper and lower first and second belts. 21, 22, a water collection trough 23 is arranged between the first and second mesh belts 21 and 22. The water collection trough 23 is arranged corresponding to the blanking opening of the cloth part 24. The wind box 25 is composed of a long box body. The two ends are provided with vacancies for the conveying mesh belt to pass through. The bottom of the wind box 25 is provided with an air inlet pipe interface 251, and the top of the wind box 25 is provided with an air pipe interface 252. The air box 25 is also provided with a horizontally arranged air distribution plate 253 and a gas collecting plate. 254, the air distribution plate 253 and the air collecting plate 254 are both perforated plates, the air collecting plate 254 is located on the upper side of the first mesh belt 21, the air distribution plate 253 is located on the lower side of the second mesh belt 22, and the first air box 25 , Two mesh belts 21, 22 are also provided with first and second air pipes 20a, 20b, the first and second air pipes 20a, 20b are respectively located on both sides of the conveyor belt (two sides of the conveying direction) and along the conveyor belt The conveying directions are respectively set (that is, the length directions of the first and second air pipes 20a, 20b are consistent with the conveying direction of the conveyor mesh belt), and the first and second air pipes 20a, 20b are provided with first air nozzles at intervals on the tube bodies. The air outlet direction of the air nozzle is directed obliquely upward to the middle of the conveying mesh belt. A third air pipe 20c is also provided between the first and second mesh belts 21 and 22. The third air pipe 20c is located at the discharge end of the conveying mesh belt and along the conveying mesh belt. The third air pipe 20c is provided with a second air nozzle at intervals on the body of the third air pipe 20c. The air outlet direction of the second air nozzle is directed diagonally upwards to the side away from the conveyor belt. The inlet pipe interface 251 and the first, second, and third air pipes Both are connected with the air outlet of the second fan.

[0040] Since the tea leaves cannot directly impact and fall onto the conveying mesh belt, a cloth member 24 needs to be provided to buffer the cloth to prevent damage to the tea leaves and make the tea leaves evenly arranged in the belt width direction of the conveying mesh belt. The hot air flow is introduced into the air box 25 through the inlet of the air inlet pipe, and the uniform distribution of the hot air flow through the cloth member makes the tea leaves conveyed by the mesh belt turn and lose water, and the tea leaves are quickly dried. The arrangement of the first and second air pipes 20a, 20b is to prevent the tea leaves from falling from the edge of the mesh belt when turning on the first mesh belt, increase the turning effect of the tea leaves, and shorten the drying time of the tea leaves. The air flow formed by the third air nozzle can make the tea leaves separate from the conveyor belt and enter the next process. For example, the first conveyor belt 26 is provided at the blanking end of the conveyor belt 26, the upper belt body of the first conveyor belt 26 is U-shaped, and the first conveyor belt 26 and the conveyor belt are arranged alternately, so that the tea leaves falling from the conveyor belt It falls into the first conveyor belt 26 and is transported by the first conveyor belt 26 to the next process for other operations.

[0041] The specific operation is, such as Picture 9 As shown, the cloth member 24 includes a cloth board and a surrounding board 243 arranged around the cloth board. The cloth board is composed of a folded board body. The height of the folded board body gradually decreases along the conveying direction of the conveyor belt. The width gradually increases along the conveying direction of the conveying mesh belt. The folded plate body includes a first plate body 241 and a second plate body 242 arranged in sequence along the conveying direction of the conveying mesh belt. The lower end side of the second plate body 242 The angle between the second plate body 242 and the horizontal plane is 3~5°, the angle between the first plate body 241 and the horizontal plane is 5~8°, and the lower end of the pipe 13 is burned. The inlet nozzle is arranged corresponding to the first plate body 241, the angle between the core wire of the discharge nozzle 131 at the lower end of the bronzing conveying pipe 13 and the first plate 241 is 8-10°, and the lower end of the bronzing conveying pipe 13 The discharge nozzle 131 is arranged in a trumpet shape with an ellipsoidal cross section (that is, the lower discharge nozzle 131 is arranged in a horn shape and the lower discharge nozzle 131 has an ellipsoidal cross section). The above cloth board can make the tea leaves evenly distributed along the width direction of the conveying mesh belt, and improve the subsequent drying effect of the tea leaves. The above-mentioned angle control is necessary, which can make the tea leaves fall smoothly on the conveyor belt, and prevent the tea leaves from colliding with the conveyor belt, causing the tea leaves to be stuck in the mesh or broken. Through a large number of experiments and optimization, it is found that the above angle is used for implementation. , The damage rate of tea can be reduced to below 0.8%, which greatly improves the quality of tea. The cloth member 24 is fixedly connected to the base through the connecting member.

[0042] Since the impurities and pesticide residues on the surface of the tea will dissolve in the hot water during the blanching process, in order to save energy, the hot water and hot air are generally recycled and reused. Therefore, the present invention adopts such Picture 10 The scheme shown is implemented: the water outlet of the sump 23 is connected to the coarse filter device 10A, the water outlet of the coarse filter device 10A is connected to the organic matter removal device 10B, and the water outlet of the organic matter removal device 10B is connected to the heater 10C for heating The water outlet of the heater 10C is connected to the hot water tank 10D, and the water outlet of the hot water tank 10D is connected to the hot water pipe; the outlet pipe interface of the air box is connected to the first fan 20A, and the air outlet of the first fan is connected to the dehumidifying device 20B is connected, the air outlet of the dehumidification device 20B is connected with the heating device 20C, the air outlet of the heating device 20C is connected with the second fan 20D, and the air outlet of the second fan 20D is connected with the air inlet pipe interface of the wind box. The coarse filter device 10A can be a general mesh filter device to remove some larger impurities, and the organic matter removal device 10B is mainly used to remove pesticide residues in the water body. It can be an activated carbon adsorption filter device or other commonly used pesticide removal devices The heater 10C heats the hot water so that the temperature of the hot water meets the demand for hot tea. The coarse filter device 10A, the organic matter removal device 10B, the heater 10C, the hot water tank 10D, and the hopper realize hot water through the pump body Of delivery. In order to achieve energy saving, the continuous hot green of tea can be guaranteed. The dehumidification device 20B is used to remove the moisture in the hot air flow, and the heating device 20C is used to increase the temperature of the hot air flow to meet the demand for drying the tea leaves.

[0043] All cooling devices can be made of bamboo plaques or bamboo screens.

[0044] When drying the tea in a traditional oven, the tea is placed on a drying bed and pushed into the oven for drying. Because it cannot turn the tea, the tea loses water unevenly, and it needs to be repeatedly cooled and recovered for multi-stage drying. Dry, and the amount of drying of the single tea is small, which affects the production efficiency of the tea, and is difficult to adapt to the continuous mass production of tea. Therefore, the present invention adopts Picture 11 The technical solution shown is implemented: the first drying device includes a first drying box H16, and the first drying box H16 is provided with first, second, and third drying boxes arranged in parallel and opposite to each other for conveying tea leaves. Drying conveyor belt. Both ends of the second drying conveyor belt H12 are located in the first drying device. The discharge end of the first drying conveyor belt H11 and the feeding end of the third drying conveyor belt H13 are both located in the first drying device. Inside a drying box H16, the feed end of the first drying conveyor belt H11 and the discharge end of the third drying conveyor belt H13 respectively extend to the outside of both ends of the first drying device. A first current collecting plate H17 and a first current distribution plate H18 are arranged horizontally in the box H16. The first current collecting plate H17 is located on the upper side of the first drying conveyor belt H11, and the first current distribution plate H18 is located on the third The lower side of the drying conveyor belt H13, the lower side of the first, second and third drying conveyor belts are respectively provided with a first current sharing plate H15, and the first electric heating tube is uniformly provided on the upper plate surface of the first current sharing plate H15 H16, the first current collecting plate H17, the first current distribution plate H18, and the first current sharing plate H15 are all composed of orifice plates (horizontally arranged). The upper top wall and the lower bottom wall of the first drying box H16 are respectively arranged The first air collection port and the first air supply port, and the first air collection port and the first air supply port are connected by an air duct. The air duct is equipped with a fourth dehumidifier and a fourth fan. The first and second drying and conveying The outer side of the belt discharge end is respectively provided with a first turning mechanism for turning tea leaves. The first turning mechanism includes a first cloth board F11 arranged obliquely. The height of the first cloth board F11 is along the first drying conveyor belt H11. Or the conveying direction of the second drying conveyor belt H12 gradually increases (that is, the height of the first cloth plate F11 outside the discharge end of the first drying conveyor belt H11 gradually increases along the conveying direction of the first drying conveyor belt H11 , The height of the first cloth board F11 outside the discharge end of the second drying conveyor belt H12 gradually increases along the conveying direction of the second drying conveyor belt H12), the surface of the first cloth board F11 and the tea leaves are in the first and The falling paths of the discharge end of the second drying conveyor belt are arranged intersectingly; the first flow-sharing plate H15 mainly makes the hot air flow in the first drying device evenly, so as to prevent the uneven air flow from rolling up the tea leaves on the conveyor belt, while using For the installation of the first electric heating tube H16, if the power of the first electric heating tube H16 in the upper and lower layers is different, the first flow-sharing plate H15 can also function to separate the inner cavity of the first drying device, so that the first drying The inner cavity of the device is divided into cavity channels with different drying temperatures for gradient drying of tea leaves. By arranging the multi-layer drying conveyor belt in the first drying box H16 and the first turning mechanism between the conversion and conveying of the adjacent drying conveyor belts, the continuous mass drying of tea leaves can be realized, and the first drying conveyor belt can be dried at the same time. A turning mechanism turns the tea leaves, so that the tea leaves can be evenly dehydrated, so that multi-stage resuscitation drying is not required, and the production efficiency of the tea leaves is improved.

[0045] A more preferred solution is that the inclination angle of the first cloth plate F11 is 45-60°, and the distance between the lower end of the first cloth plate F11 and the conveying surface of the adjacent drying conveyor belt on the lower side is 2.5-3.5 cm. The control of the size can make the tea leaves slipped from the first fabric board flip 120-135°, that is, only one flip is performed to avoid the tea leaves turning too much, so that the top and bottom faces of most tea leaves are adjusted. The control of the tilt angle of the board F11 is very important. Too large or too small will reduce the effective turnover rate of the tea. When the tilt angle is controlled at 45-60°, the effective turnover rate of the tea can reach more than 88%; in addition, the first and second drying The discharge end of the conveyor belt is also provided with a first air pipe H19 respectively. The first air pipe H19 is arranged along the width of the first and second drying conveyor belts. The first air pipe H19 is connected to the first air blowing device. The first air pipe H19 The tube body is provided with a first air nozzle for air blowing. The blowing direction of the first air nozzle is diagonally downward and points to the side close to the lower end of the first cloth plate F11. The first cloth plate F11 is composed of a wave plate. The corrugation direction of the plate is consistent with the width direction of the first and second drying conveyor belts. The conveying direction of the second drying conveyor belt H12 is opposite to the conveying direction of the first and third drying conveyor belts; the first air pipe H19 can be set first Makes the tea leaves on the upper drying conveyor belt fall onto the lower drying conveyor belt, and secondly, it can promote the effect of tea turning, try to ensure that all tea leaves complete the turning action, so that the effective turning rate of tea is increased to 97.2% or more. Improve the efficiency of tea drying.

[0046] The structures of the first and second drying devices are the same. The power of the first electric heating tubes H16 installed on the three first flow sharing plates H15 in the second drying device is gradually reduced from top to bottom, thus spraying organic selenium The tea leaves in the solution are dried in a gradient in the second drying device, so that the organic selenium solution can be better integrated into the tea, and the quality of the tea is improved and the tea is dehydrated in a balanced manner.

[0047] In addition, the traditional operation method has two implementation methods for spraying organic selenium solution on tea. One is: direct spraying without turning the tea. This operation makes the tea only spray the organic selenium solution on one side, and the tea cannot be absorbed uniformly, which affects the effect of the tea. The absorption of organic selenium, in addition, the uneven absorption causes the loss of the uniformity of the moisture content in the tea, which affects the subsequent drying operation and reduces the quality of the tea; the second is: the tea is manually turned manually, and the tea is turned in this way The uniformity of the selenium is poor, and there is still the problem of uneven spraying. In addition, there is a large amount of organic selenium solution on the palm of the hand during operation, resulting in waste of organic selenium and tea hygiene problems. Therefore, the present invention adopts Picture 12 , 13 The shown technical solution is implemented. The spraying device includes a spraying box P13. The spraying box P13 is provided with first and second spraying conveyor belts arranged in parallel and opposite to each other for conveying tea leaves. The first spraying conveyor belt P11 The discharge end and the feed end of the second spray conveyor belt P12 are both located inside the spray box P13 and are arranged oppositely. The feed end of the first spray conveyor belt P11 and the discharge end of the second spray conveyor belt P12 respectively extend to On the outside of both ends of the spraying oven, above the first and second spraying conveyor belts, mounting brackets P14 are respectively installed. The mounting brackets P14 are installed with a spray mechanism for spraying organic selenium solution on the surface of the tea. The spray mechanism is compatible with the organic selenium solution storage tank. The spraying mechanism includes spraying pipes P15 arranged at intervals along the tea transportation direction on the mounting bracket P14. The spraying pipes P15 are arranged along the bandwidth of the first and second spraying conveyor belts. The spraying pipes P15 are provided with spray heads at intervals, and adjacent spraying pipes The spray heads on P15 are arranged in a staggered pattern. A second turning mechanism is provided between the discharge end of the first spray conveyor belt P11 and the feed end of the second spray conveyor belt P12. The second turning mechanism includes an inclined arrangement The height of the second cloth board F12, the height of the second cloth board F12 gradually increases along the conveying direction of the first spray conveyor belt P11, the surface of the second cloth board F12 and the tea leaves falling at the discharge end of the first spray conveyor belt P11 The paths are intersected and arranged; by setting the first and second spraying conveyor belts in the spraying box P13 and setting the second turning mechanism between the first and second spraying conveyor belts, the continuous mass spraying of tea leaves is realized. The spray conveyor belt P11 sprays the organic selenium solution on one surface of the tea leaves, and then turns the tea leaves through the second turning mechanism, and then sprays the organic selenium solution on the other side surface of the tea leaves on the second spray conveyor belt P12, so that The organic selenium solution is evenly sprayed on the entire outer surface of the tea, so that the water content of the tea after absorbing the organic selenium solution is still balanced, which is beneficial to simplify the subsequent drying process and improve the production efficiency and quality of the tea.

[0048] The preferred solution is: the inclination angle of the second cloth board F12 is 45-60°, the distance between the lower end of the second cloth board F12 and the conveying surface of the second spray conveyor belt P12 is 2.5 to 3.5 cm; the first spray conveyor belt P11 The discharge end is also provided with a second air pipe P16, the second air pipe P16 is arranged along the width of the first spray conveyor belt P11, the second air pipe P16 is connected with the second air blowing device, and the second air pipe P16 is arranged at intervals on the body There is a second air nozzle for air jet. The blowing direction of the second air nozzle is diagonally downward and pointing to the side close to the lower end of the second cloth panel F12. The second cloth panel F12 is composed of a wave plate, and the corrugation direction of the wave plate is The width directions of the first and second spray conveyor belts are the same, and the conveying directions of the first and second spray conveyor belts are the same. The above-mentioned size control and the purpose of setting the second air pipe P16 are consistent with the first drying device.

[0049] The first and second turning plates composed of wave plates can ensure that the tea leaves are evenly arranged along the bandwidth of the conveyor belt after turning the materials. Generally, the groove depth of the groove on the wave plate is 1~1.2cm and the groove width is 2~2.5. cm, so that the effect of uniform distribution of tea leaves is the best.

[0050] The specific process for producing green tea using the above equipment is:

[0051] A production process of selenium-enriched green tea includes the following steps:

[0052] Spreading: Place the picked fresh leaves (one bud and one leaf, one bud and two leaves) on the spreading device for spreading until the color of the tea starts to darken, turning the fresh leaves during spreading;

[0053] Bronzing: Put the spread tea leaves into the bronzing device for 50~55s, controlling the temperature of hot water to 95~98℃, after broiling, transport the tea leaves to the drying device to dry;

[0054] First-level curing: After drying, put the tea leaves in a drum-curing machine at 130~140℃ for 1.5-2min;

[0055] Cooling: Put the first-grade tea leaves into the first cooling device, and then cool them for 5-10 minutes at room temperature, so that the tea will be recovered, non-enzymatic chemical reaction will occur, and the flavor and fragrance will be developed;

[0056] Second-level curing: transport the cooled tea to the microwave curing device for a second curing, the second curing time is 1.2~1.25min, the power is 12KW (microwave output power), and the tea is placed in the second cooling device after the second curing Resuscitate at room temperature and cool for 5-8 minutes;

[0057] Arrangement: After the second level is cooled, put the tea in the first unwinding machine for the first level arrangement. The temperature of the first level arrangement is 50~60℃, and the time is 2~2.5min. Put it on the third cooling device for three-level cooling. The three-level cooling time is 5-8min. After the third-level cooling, place the tea in the second sorting machine for second-level sorting. The temperature is 40~50℃, and the time is 1~1.5min. After the second ordering is finished, it is spread on the fourth cooling device at room temperature for fourth level cooling, and the fourth level cooling time is 8-10min;

[0058] Drying: After four-stage cooling, the tea leaves are placed in the first drying device for first-stage drying. The temperature of the first-stage drying is 100~105℃, and the first-stage drying until the moisture content of the tea drops below 25%. After the primary drying is completed, the organic selenium solution is sprayed on the surface of the tea by a spray device to increase the moisture content of the tea to 30-35%. After the organic selenium solution is sprayed, the tea is placed in the second drying device for secondary drying. After the secondary drying treatment is completed, spread it at room temperature on the sixth cooling device for six-stage cooling, and the six-stage cooling time is 30~35min; the secondary drying treatment is: first 100~105℃ drying treatment 8~ 10min, and then drying at 85~90℃ until the moisture content of the tea drops below 5%; the spraying amount of the organic selenium solution is based on the organic selenium content of 0.23~0.25mg/kg in the selenium-enriched tea, and the organic selenium solution is The selenium-enriched wine mother is prepared with distilled water after removing alcohol and peculiar smell by steaming; it can avoid the influence of spraying organic selenium solution on the aroma, color and taste of tea soup.

[0059] Maturation: After drying, put the tea leaves in a refrigerated room at 1~3℃ for 1 month of refrigeration and maturation (when refrigerated and maturing, try to isolate oxygen or control the oxygen content to a very low level);

[0060] Fragrance: Put the refrigerated and matured tea leaves into a flavoring machine at 80-85°C for 30-35 minutes, cool and vacuum package after the flavoring is finished.

[0061] The green tea prepared by the above process has a smooth strip shape, a bright green color, a chestnut fragrance, a strong aroma, a bright green soup, a mellow and fresh tea soup, and is rich in organic selenium. It is a high-quality health green tea.

[0062] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, after knowing the content of the present invention, they can also make changes to them without departing from the principle of the present invention. Several equivalent transformations and substitutions, these equivalent transformations and substitutions should also be regarded as belonging to the protection scope of the present invention.