Intelligent tea production line and processing method

Abstract

The invention discloses an intelligent tea production line and a processing method, and relates to the technical field of tea production. The production line comprises a tea leaf elevator, a duplex fixation unit, a vibration tank, a winnowing machine elevator, a winnowing machine, a winnowing machine vibration tank, a dampening machine elevator, a dampening machine, a tea leaf elevator, a triplet carding unit, a tea leaf dryer, a vibration tank, a mesh belt type cooling conveyor, a tea leaf dryer, a vibration tank, a winnowing machine elevator and a winnowing machine which are connected in sequence, and a fine selection line is arranged for removing impurities. The production line generally controls a plurality of numerical control cabinets through a numerical control center to realize sectional control, and the numerical control cabinets adopt a PLC processor and a touch screen to perform parameter adjustment and temperature closed-loop control. The processing method comprises the steps of feeding, two-stage fixation, winnowing, moisture regaining, three-stage strip tidying, drying and cooling, drying, winnowing and multi-stage fine selection. According to the invention, precision, standardization and intellectualization of tea processing are realized.

Description

Technical Field

[0001] This invention relates to the field of tea production technology, specifically to an intelligent tea production line and processing method. Background Technology

[0002] Anji white tea, a renowned tea with unique quality characteristics, relies heavily on precise control of its processing techniques to ensure its color, aroma, and taste. Traditional Anji white tea processing largely depends on assembly line operations using a combination of individual machines, such as existing technologies (e.g., the tea processing system disclosed in patent number ZL201520724468.5). While these systems achieve a degree of mechanization, they also suffer from significant technological bottlenecks. Firstly, at the control level, each individual machine typically uses independent mechanical control panels (such as switches and knobs), resulting in low levels of intelligence and standardization across the entire production line. Equipment startup is cumbersome, process parameters (such as temperature and frequency) are inaccurately adjusted and poorly displayed, and centralized monitoring, data recording, and closed-loop feedback are impossible, making it difficult to guarantee product quality stability. Secondly, in terms of refining processes, traditional impurity removal methods mainly rely on wind separation and subsequent manual screening. This approach is limited in its effectiveness at removing common solid impurities such as red stems, yellow leaves, and fragments, as well as tiny foreign objects like hair, dust, and iron filings. It is inefficient and prone to secondary contamination due to human fatigue, severely impacting the purity and safety of Anji white tea. The root of these problems lies in the lack of integrated intelligent control solutions and innovative multi-stage refining processes in the existing technological system, hindering the development of the Anji white tea industry towards higher standards and higher quality. Therefore, the industry urgently needs a new production line and processing method that can achieve precise and intelligent control throughout the entire process and integrate highly efficient impurity removal technologies. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the low level of intelligence in the existing tea production process leads to inaccurate process control, and the imperfect selection process leads to foreign matter residue in the tea. The present invention provides an intelligent tea production line and processing method to achieve precise control of the processing process and efficient removal of impurities.

[0004] To solve the above problems, the technical solution provided by the present invention is as follows:

[0005] An intelligent tea production line includes, in sequence, a tea elevator, a two-unit fixation machine, a vibrating trough, an air separator elevator, an air separator, an air separator vibrating trough, a rehumidifier elevator, a rehumidifier, a tea elevator, a three-unit tea sorting machine, a tea dryer, a vibrating trough, a mesh belt cooling conveyor, a tea dryer, a vibrating trough, an air separator elevator, and an air separator;

[0006] The production line also includes a sorting line, which comprises a tea elevator, a vibrating feeder, an elevator, a color sorter, an elevator, a vibrating trough, an elevator, a vibrating feeder, an air separator, an electrostatic precipitator, a high-magnetic bar, and a conveyor belt connected in sequence.

[0007] The production line is equipped with a CNC center and multiple CNC cabinets. The CNC cabinets control the equipment of the production line in sections. The CNC center is communicatively connected to all CNC cabinets and is used to uniformly control the CNC cabinets. The CNC center realizes human-machine interaction, data storage, process parameter management, production data and remote monitoring.

[0008] Each of the CNC cabinets includes a PLC processor, an analog input module, and a data processing module. The PLC processor is connected to a touch screen for starting and stopping the equipment and adjusting parameters.

[0009] The two-unit blanching machine and the three-unit shaping machine are equipped with infrared temperature detectors and proportional valves. The infrared temperature detectors are used to detect the temperature of the pan surface, and the PLC processor adjusts the gas flow through the proportional valves based on the comparison between the detected temperature and the set value.

[0010] By connecting the equipment in sequence, a main production line process from fixation, shaping, drying to air separation was constructed, realizing continuous and automated production of the core processes of Anji white tea.

[0011] By adding an independent selection line (including color sorting, air sorting, electrostatic dust removal, high magnetic iron removal and other equipment), a multi-level, in-depth removal process has been constructed specifically for solid impurities (red stems, yellow leaves, etc.) and micro foreign objects (hair, dust, iron filings, etc.) in tea leaves, aiming to significantly improve the purity and safety of the finished tea.

[0012] By setting up a CNC center and deploying multiple CNC cabinets in segments, an intelligent control system architecture of "centralized management and decentralized control" was constructed, which aims to solve the problems of low intelligence, inaccurate parameter adjustment, and inability to centrally monitor and record data caused by traditional single-machine independent control.

[0013] Infrared temperature detectors and proportional valves are integrated into key units (cracking and skewing) to provide a hardware foundation for precise and automatic control of temperature, a core process parameter.

[0014] Optionally, the CNC cabinet includes a blanching CNC cabinet, a re-moistening air-separation CNC cabinet, a skewing CNC cabinet, and a drying air-separation CNC cabinet, each controlling a corresponding equipment group.

[0015] The overall control system is further specified into modular control units divided according to process sections (CNC cabinets for blanching, re-moistening air separation, shaping, and drying air separation). This division makes control responsibilities clearer, facilitates regional debugging, maintenance, and process management, and improves the system's organizational structure and operability.

[0016] Optionally, the dual-unit blanching machine includes two pots, each equipped with front and rear temperature control, and the triple-unit shaping machine includes three pots, each equipped with front and rear temperature control.

[0017] The specific structures of the two-unit fixation machine and the three-unit shaping machine (two and three pots respectively) were defined, and each pot was equipped with two independent temperature controls: one for the front temperature and one for the rear temperature. This structure allows for differentiated temperature control in different areas of a single pot, to more precisely meet the temperature uniformity requirements of tea leaves during fixation and shaping, avoid local overheating or underheating, and improve processing uniformity.

[0018] Optionally, the PLC processor receives the pot surface temperature signal through the analog input module, compares it with the set temperature value, and controls the opening of the proportional valve to keep the pot surface temperature within the range of ±5 degrees Celsius of the set temperature value.

[0019] The document specifically defines the accuracy target (±5℃) for temperature closed-loop control and its implementation path. It clarifies the signal flow (temperature detection → analog input → PLC processing → output control) and the controlled object (proportional valve opening), aiming to ensure high precision and stability in temperature control during key processes such as fixation and shaping. This is a core technical means to guarantee the consistency of tea quality.

[0020] Optionally, the color sorter has three detection levels: upper, middle, and lower, for identifying and removing red bars, yellow sheets, and foreign fragments, respectively.

[0021] The specifications stipulate that the color sorter adopts a specific structure with upper, middle and lower three-layer detection levels. This design aims to significantly improve the recognition rate and rejection accuracy of foreign objects of different types and physical properties (such as red rods, yellow pieces, and fragments) through layered and target-specific detection, achieving a more efficient and accurate sorting effect than single-layer or general color sorting.

[0022] A tea processing method, based on the aforementioned intelligent tea production line, includes the following steps:

[0023] S1: Loading materials;

[0024] S2: Perform two-stage finishing based on the first set parameters;

[0025] S3: Wind sorting;

[0026] S4: Reabsorption;

[0027] S5: Perform three-segment processing based on the second set parameters;

[0028] S6: Drying and cooling are performed based on the third set parameters;

[0029] S7: Drying is performed based on the fourth set parameter;

[0030] S8: Wind selection;

[0031] S9: Impurity removal based on multi-level selection parameters.

[0032] The tea processing method transforms the capabilities of the production line hardware into a specific, executable sequence of processing steps (S1-S9). By introducing the expression "based on the Xth set parameter", the core of intelligent control (i.e. parameterized and standardized production) is integrated into the method, aiming to achieve standardization, repeatability, and high quality and efficiency in the processing process.

[0033] Optionally, the parameters for the two-stage blanching process include at least one of the following: temperature control range 355℃-365℃, 280℃-290℃, 255℃-265℃, and 155℃-165℃; and frequency control range 920HZ-980HZ.

[0034] This provides specific and optimized temperature and frequency process parameter windows for the crucial two-stage fixation process. These parameter ranges (such as 355-365℃ and 920-980Hz) are empirical values ​​summarized based on the quality requirements of Anji white tea. Their function is to guide production and ensure that the fixation process can fully deactivate enzyme activity and dissipate grassy odor, while avoiding scorching and forming a good color and aroma base.

[0035] Optionally, the parameters of the three-segment strip include at least one of the following: temperature control range 195℃-205℃, 180℃-190℃, 175℃-185℃, and 165℃-175℃; and frequency control range 860HZ-930HZ.

[0036] Specific and optimized temperature and frequency process parameter windows are provided for the three-stage tea shaping process. These parameters (such as 195-205℃ and 860-930Hz) are designed to guide the shaping process, so that the tea leaves can be gradually straightened and tightened under appropriate heat and mechanical force, and further evaporate moisture and develop aroma.

[0037] Optionally, the multi-stage selection process includes color sorting, air sorting, electrostatic dust removal, and high-magnetic iron removal. Color sorting: The color sorter selects impurities such as yellow leaves, fragments, scorched leaves, red stems, and tea fruits based on their color and shape. Air sorting: The air-powered sorting machine selects impurities such as stones, fragments, and broken leaves based on their weight, greatly reducing foreign objects such as fragments, tea fruits, and red stems, with the detection rate reduced to 0.1%. Electrostatic dust removal: The electrostatic dust collector can remove foreign objects such as tea hairs, dust, and hair. High-magnetic iron removal: High-magnetic rods can remove foreign objects such as iron filings, reducing the detection rate of impurities (such as hair and iron filings) in the finished Anji white tea to below 0.01%.

[0038] The specific technical means integrated into the multi-level selection process are clearly defined, namely, the combination of color sorting, air sorting, electrostatic dust removal, and high-magnetic iron removal. Its function is to construct a multi-level, multi-principle composite impurity removal system, targeting solid impurities with abnormal color / shape (color sorting), light and airy objects with weight / density differences (air sorting), tiny light non-metallic foreign objects such as hair and dust (electrostatic), and ferromagnetic metallic foreign objects (high-magnetic), thereby achieving near-all-round impurity removal.

[0039] Optionally, before the feeding step, a spreading step is also included, in which fresh leaves are spread in a spreading trough for 4 to 8 hours. The spreading trough is equipped with temperature and humidity sensors, and the data is connected to the CNC center to realize the monitoring and recording of the spreading process.

[0040] At the very beginning of the intelligent production line processing method, a traditional but crucial withering pretreatment step and its process parameters (withering for 4-8 hours) are added. Its function is to release some moisture and grassy odor through appropriate withering of fresh leaves, and to initiate the internal decomposition and transformation of tea leaves, laying a good biochemical foundation for subsequent heat processing steps such as fixation. It is a key pretreatment for forming the fresh and refreshing taste of Anji white tea.

[0041] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0042] This invention improves production efficiency and parameter accuracy through centralized segmented control; multi-stage selection ensures the purity of tea leaves; and equipment innovations such as the two-stage fixation machine and the three-stage shaping machine optimize the processing technology. Attached Figure Description

[0043] Figure 1 A flowchart illustrating a tea processing method as proposed in an embodiment of the present invention; Detailed Implementation

[0044] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0045] Example 1

[0046] An intelligent tea production line includes, in sequence, a tea elevator, a two-unit fixation machine, a vibrating trough, an air separator elevator, an air separator, an air separator vibrating trough, a rehumidifier elevator, a rehumidifier, a tea elevator, a three-unit tea sorting machine, a tea dryer, a vibrating trough, a mesh belt cooling conveyor, a tea dryer, a vibrating trough, an air separator elevator, and an air separator;

[0047] The production line also includes a sorting line, which consists of a tea elevator, a vibrating feeder, an elevator, a color sorter, an elevator, a vibrating trough, an elevator, a vibrating feeder, an air separator, an electrostatic precipitator, a high-magnetic bar, and a conveyor belt, connected in sequence.

[0048] The production line is equipped with a CNC center and multiple CNC cabinets. The CNC cabinets control the equipment of the production line in sections. The CNC center communicates with all the CNC cabinets and is used to control the CNC cabinets in a unified manner. The CNC center realizes human-machine interaction, data storage, process parameter management, production data and remote monitoring.

[0049] Each CNC cabinet includes a PLC processor, an analog input module, and a data processing module. The PLC processor is connected to a touch screen for starting and stopping the equipment and adjusting parameters.

[0050] The two-unit blanching unit and the three-unit shaping unit are equipped with infrared temperature detectors and proportional valves. The infrared temperature detectors are used to detect the temperature of the pan surface, and the PLC processor adjusts the gas flow through the proportional valves based on the comparison between the detected temperature and the set value.

[0051] Process operation principle: Fresh leaves or semi-finished tea are connected in the order of the equipment in the claims and flow through each processing station in sequence. Under the action of gravity, mechanical transmission (such as elevator, vibrating trough, conveyor belt) and other forces, the entire process of processing from pretreatment, fixation, shaping, drying to multi-stage impurity removal is completed.

[0052] Control and Operation Principle: The CNC center acts as the top-level monitoring and command hub, communicating with the CNC cabinets in each area. Each CNC cabinet's PLC processor serves as the local control core, receiving sensor signals from connected devices (such as infrared temperature detectors) (converted via analog input modules). After processing by the data processing module and internal program logic, control signals are output. Operators use touchscreens to start and stop equipment, set and monitor process parameters (such as set temperature and frequency). For temperature control, the PLC compares the real-time pot surface temperature measured by the infrared detector with the set value, calculates the control quantity, and precisely controls the gas supply by adjusting the opening of the proportional valve, thereby achieving closed-loop automatic adjustment of the heating temperature and ensuring process stability.

[0053] The CNC cabinets include those for blanching, rehydration air separation, shaping, and drying air separation, each controlling its corresponding equipment group. During production line operation, the start-up, shutdown, interlocking, process parameter execution, and monitoring of equipment within each process section (e.g., the blanching CNC cabinet controlling a dual-unit blanching unit) are independently managed by their respective dedicated CNC cabinets. Each CNC cabinet simultaneously maintains data communication with the overall CNC center, reporting status and receiving instructions, achieving a "local autonomy, global collaboration" operating mode.

[0054] A two-unit fixation machine consists of two pots, each with front and rear temperature controls. A three-unit shaping machine consists of three pots, each with front and rear temperature controls. During fixation or shaping, the tea leaves move from front to back within the pots. Each pot may have at least two infrared temperature detection points (front and rear) to monitor the pot surface temperature at the tea inlet and outlet areas, respectively. Based on feedback from these two detection points, the PLC independently adjusts the power of the corresponding gas proportional valve (or heater) to stabilize the front and rear temperatures of the pots at their respective set process values, creating a temperature gradient or uniform temperature field that better meets the process requirements.

[0055] The PLC processor receives the pot surface temperature signal through the analog input module and compares it with the set temperature value. By controlling the opening of the proportional valve, it maintains the pot surface temperature within a range of ±5 degrees Celsius of the set temperature value. An infrared temperature detector (non-contact) converts the detected pot surface temperature into an analog electrical signal. This signal enters the analog input module of the CNC cabinet and is converted into a digital signal that the PLC can process. The PLC processor's internal PID (Proportional-Integral-Derivative) or other control algorithms compare the current temperature digital signal with the temperature value set by the operator on the touchscreen and calculate the error. Based on the magnitude and trend of the error, the PLC outputs a corresponding control quantity. This control quantity determines the opening degree of the proportional valve, thereby linearly adjusting the gas flow rate and ultimately dynamically stabilizing the pot surface temperature within a narrow range of ±5 degrees Celsius around the set value.

[0056] The color sorter has three detection layers—upper, middle, and lower—for identifying and removing red rods, yellow flakes, and fragments, respectively. The specific structure of this three-layer detection system is defined for the color sorter. This design aims to significantly improve the identification rate and removal accuracy of different types of foreign objects with different physical properties (such as red rods, yellow flakes, and fragments) through layered and target-specific detection, achieving a more efficient and accurate sorting effect than single-layer or general-purpose color sorters.

[0057] The tea leaf elevator includes an upwardly inclined frame, a power unit, a conveyor belt, and a leaf-leveling device. The frame has a feed hopper at the bottom and a discharge hopper at the top. The conveyor belt, mounted on the frame, transports tea leaves from the feed hopper to the discharge hopper. The leaf-leveling device includes a leaf-leveling shaft with leaf-leveling blades arranged spirally around the shaft. The leaf-leveling blades on the left and right sides of the shaft are arranged spirally in opposite directions. The power unit provides power to the conveyor belt and the rotating shaft.

[0058] The blanching and shaping machine includes a frame, a multi-basin pan, a swing mechanism mounted on the frame for driving the multi-basin pan to reciprocate, an eccentric wheel transmission mechanism connected to the swing mechanism, an AC motor for driving the eccentric wheel transmission mechanism, and a gas device for heating. The gas device includes a gas source and a gas nozzle connected to it. A proportional valve for controlling the amount of gas is installed on the pipeline between the gas source and the gas nozzle. An infrared temperature detector is installed on the frame for detecting the surface temperature of the multi-basin pan. The probe of the infrared temperature detector is aimed at the multi-basin pan to detect the surface temperature of the pan in real time. The blanching and shaping machine also includes a frequency converter for adjusting the swing frequency by adjusting the speed of the AC motor.

[0059] The air separator includes a frame, an air duct fixedly installed on the frame, a feeder located above the air duct, an air separator chamber, and a dust removal chamber with dust removal ports. The end of the air duct is connected to one side of the air separator chamber, and the other side of the air separator chamber is connected to the dust removal chamber. The air separator chamber includes an air separator chamber cavity, and multiple tea outlets are provided below the air separator chamber cavity.

[0060] The rehumidifier includes a frame and a drive motor. The frame has a housing, and the drive motor drives a horizontal conveyor belt. The housing has at least two horizontal conveyor belts distributed vertically. The housing has a tea inlet for conveying tea to the uppermost horizontal conveyor belt and a tea outlet for conveying tea out of the lowermost horizontal conveyor belt. Different horizontal conveyor belts are equipped with sprockets, which are connected by chains. The housing has windows covered with breathable mesh. The conveying directions of adjacent horizontal conveyor belts are opposite: the feed end of the lower horizontal conveyor belt extends horizontally beyond the discharge end of the upper horizontal conveyor belt.

[0061] Tea drying machine: includes a frame, with upper, middle and lower ring chains with drying plates inside the frame. The upper, middle and lower ring chains are driven by a speed change device. The upper ring chain is connected to an upper leaf conveying device at its end. The drying plates of the box adopt a fine-pore filter structure. A dehumidification hood is provided at the top of the frame. An air inlet box is provided on the other side of the frame. An air inlet pipe is connected to the outside of the air inlet box. A tea outlet is provided at the lower end of the frame. An impeller is provided above the tea outlet.

[0062] Mesh belt cooling conveyor: includes a support frame, side plates, motor, fan, shaft, and conveyor mesh belt. A side plate is installed on each side of the support frame. The conveyor mesh belt is set between the lower sides of the side plates through the shaft. The motor is connected to the shaft through a transmission belt. The fan is set above the side plates.

[0063] Example 2

[0064] Combined with appendix Figure 1 This embodiment of a tea processing method includes the following steps:

[0065] S1: Loading materials;

[0066] S2: Perform two-stage finishing based on the first set parameters;

[0067] S3: Wind sorting;

[0068] S4: Reabsorption;

[0069] S5: Perform three-segment processing based on the second set parameters;

[0070] S6: Drying and cooling are performed based on the third set parameters;

[0071] S7: Drying is performed based on the fourth set parameter;

[0072] S8: Wind selection;

[0073] S9: Impurity removal based on multi-level selection parameters.

[0074] The entire processing is automated under the unified scheduling of the CNC center and the coordinated control of each CNC cabinet. Fresh leaves or materials undergo physical and chemical changes in the corresponding equipment units in the order of S1 to S9. The process conditions (such as temperature, frequency, time, air volume, etc.) for each step (S2 fixing, S5 shaping, S6 / S7 drying, S9 selection, etc.) are preset by the operator in the CNC system, and the equipment automatically adjusts its operating status according to these "set parameters" (temperature control as described in claim 4). The selection step (S9) combines multiple physical field impurity removal principles such as color sorting, air sorting, electrostatic, and high magnetic fields to perform multi-stage purification treatment on the tea leaves from coarse to fine and from large to small particles.

[0075] The parameters for the two-stage blanching process include at least one of the following temperature control ranges: 355℃-365℃, 280℃-290℃, 255℃-265℃, and 155℃-165℃; and a frequency control range: 920Hz-980Hz. During the blanching process, each pot (and its preceding and following temperature zones) of the dual-unit blanching machine will automatically adjust and stabilize its surface temperature within the specific temperature range given in this claim, according to the closed-loop control principle of claim 4 (e.g., the temperature of the first pot is controlled at 355-365℃). Simultaneously, the vibration frequency driving the pot movement is also set within the specific range of 920-980Hz. This precise synergistic effect of "temperature-time-frequency" ensures the scientific nature and reproducibility of the blanching process.

[0076] The parameters for the three-stage tea-forming process include at least one of the following temperature control ranges: 195℃-205℃, 180℃-190℃, 175℃-185℃, and 165℃-175℃; and a frequency control range: 860Hz-930Hz. During the tea-forming process, the three pans (and their respective front and rear temperature zones) of the three-stage tea-forming unit operate according to different set temperature ranges (e.g., decreasing sequentially) and frequency ranges. The PLC system controls the temperature of each pan to remain stable within the set range and maintains a constant vibration frequency. The tea leaves are processed sequentially in the three pans, and under the gradient temperature and mechanical vibration, their shape and internal components undergo regular changes, ultimately forming the straight and tightly rolled shape characteristic of Anji white tea.

[0077] Multi-stage selection includes color sorting, air sorting, electrostatic dust removal, and high-magnetic iron removal. In the selection line (S9), the tea leaves pass through the following stages in sequence:

[0078] Color sorter: Based on optical image recognition, it removes red bars, yellow sheets, etc.

[0079] Air-powered separator: Uses airflow to separate lighter materials such as lint and dust.

[0080] Electrostatic dust collector: Tea leaves are passed through a high-voltage electrostatic field, and tiny, lightweight insulators (such as hair and plastic filaments) are attracted and removed due to induced charges.

[0081] High magnetic rod: Uses a strong magnetic field to adsorb ferromagnetic metal impurities such as iron filings mixed in tea leaves.

[0082] Color sorting: Color sorters separate impurities such as yellow leaves, fragments, scorched leaves, red stems, and tea fruits based on color and shape. Air sorting: Air-powered sorters remove stones, fragments, and broken leaves based on quality, significantly reducing foreign objects such as fragments, tea fruits, and red stems, lowering the detection rate to 0.1%. Electrostatic dust removal: Electrostatic dust collectors remove foreign objects such as tea hairs, dust, and lint. High-magnetic iron removal: High-magnetic rods remove foreign objects such as iron filings, reducing the detection rate of impurities (such as hair and iron filings) in the finished Anji white tea to below 0.01%.

[0083] By applying these four physical principles in series, efficient and in-depth removal of complex foreign objects can be achieved.

[0084] Before the feeding step, there is a withering step where fresh leaves are spread out in a withering trough for 4 to 8 hours. The withering trough is equipped with temperature and humidity sensors, and the data is connected to a numerical control center to monitor and record the withering process. Before entering the S1 "feeding" step, the harvested fresh leaves are evenly spread in the withering trough and left to stand for 4-8 hours under natural or controlled temperature and humidity conditions. During this period, the fresh leaves soften through slow respiration and moisture evaporation, some macromolecules begin to hydrolyze, and aroma precursors are formed. This biochemical preparation process allows the subsequent intelligent thermal processing to more effectively "lock in" and transform these beneficial components, improving the quality of the finished tea.

[0085] Production parameters:

[0086] Withering: Fresh leaves of Baiye No. 1 tea tree are spread in the withering trough for 4-8 hours. The withering trough is equipped with temperature and humidity sensors, and the data is connected to the numerical control center to monitor and record the withering process.

[0087] Fixation: The temperature of the front-end equipment of the No. 1 continuous tea fixing and shaping machine in the dual-unit fixing and shaping machine is 355℃-365℃.

[0088] The temperature of the rear equipment of the No. 1 continuous tea fixing and shaping machine in the dual-unit fixing and shaping machine is 280℃-290℃.

[0089] The average frequency of the No. 1 continuous tea fixing and shaping machine in the dual-unit fixing and shaping machine group is 980 Hz.

[0090] The temperature of the front-end equipment of the No. 2 continuous tea fixing and shaping machine in the dual-unit fixing and shaping machine is 255℃-265℃.

[0091] The temperature of the rear equipment of the No. 2 continuous tea fixing and shaping machine in the dual-unit fixing and shaping machine is 155℃-165℃.

[0092] The average frequency of the No. 2 continuous tea fixing and shaping machine in the dual-type fixing and shaping unit is 920 Hz.

[0093] Rehydration: The average rehydration time for Baiye No. 1 is 50-70 minutes.

[0094] Tea shaping: The front-end equipment temperature of the No. 1 continuous tea fixing and shaping machine in the three-unit tea shaping and shaping machine is 195℃-205℃.

[0095] The temperature of the rear equipment of the No. 1 continuous tea fixing and shaping machine in the triple-unit tea processing unit is 180℃-190℃.

[0096] The average frequency of the No. 1 continuous tea fixing and shaping machine in the three-unit tea processing unit is 930 Hz.

[0097] The front-end equipment temperature of the No. 2 continuous tea fixing and shaping machine in the triple-unit tea processing line is 180℃-190℃.

[0098] The temperature of the rear equipment of the No. 2 continuous tea fixing and shaping machine in the triple-unit tea processing unit is 180℃-190℃.

[0099] The average frequency of the No. 2 continuous tea fixing and shaping machine in the three-unit tea-processing unit is 860 Hz.

[0100] The front-end equipment temperature of the No. 3 continuous tea fixing and shaping machine in the triple-unit tea processing line is 175℃-185℃.

[0101] The temperature of the rear equipment of the No. 3 continuous tea fixing and shaping machine in the triple-unit tea processing line is 165℃-175℃.

[0102] The average frequency of the No. 3 continuous tea fixing and shaping machine in the three-unit tea processing unit is 860 Hz.

[0103] Initial drying: The drying temperature of the No. 1 hot air dryer is 105℃-115℃, and the average drying time is 18min-22min.

[0104] Re-drying: The drying temperature of the No. 2 hot air dryer is 90℃-100℃, and the average drying time is 10min-14min.

[0105] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A tea leaf intelligent production line, characterized in that, It comprises tea lifting machine, two-in-one fixation machine set, vibration tank, air selection machine lifting machine, air selection machine, air selection machine vibration tank, moisture regenerator lifting machine, moisture regenerator, tea lifting machine, three-in-one striping machine set, tea drying machine, vibration tank, mesh belt type cooling conveyor, tea drying machine, vibration tank, air selection machine lifting machine, air selection machine; The production line is also provided with a fine selection line, which comprises tea lifting machine, vibration feeder, lifting machine, color selection machine, lifting machine, vibration tank, lifting machine, vibration feeder, air selection machine, electrostatic dust collector, high magnetic bar, and transmission track in sequence. The production line is provided with a numerical control center and multiple numerical control cabinets, the numerical control cabinets control the devices of the production line in sections, the numerical control center is in communication connection with all the numerical control cabinets, and is used for unified control of the numerical control cabinets, and the numerical control center can realize man-machine interaction, data storage, process parameter management, production data and remote monitoring. Each numerical control cabinet comprises a PLC processor, an analog input module and a data processing module, the PLC processor is connected with a touch screen, and is used for start-stop control and parameter adjustment of the device. The two-in-one fixation machine set and the three-in-one striping machine set are provided with an infrared temperature detector and a proportional valve, the infrared temperature detector is used for detecting the temperature of the pot surface, and the PLC processor adjusts the amount of gas through the proportional valve according to the comparison result of the detected temperature and the set value.

2. The tea intelligent production line according to claim 1, characterized in that, The numerical control cabinets comprise fixation numerical control cabinets, moisture regenerator and air selection numerical control cabinets, striping numerical control cabinets and drying and air selection numerical control cabinets, and are used for controlling corresponding device groups respectively.

3. The tea intelligent production line according to claim 1, characterized in that, The two-in-one fixation machine set comprises two pot bodies, each pot body is provided with front temperature control and rear temperature control, and the three-in-one striping machine set comprises three pot bodies, each pot body is provided with front temperature control and rear temperature control.

4. The tea intelligent production line according to claim 1, characterized in that, The PLC processor receives the pot surface temperature signal through the analog input module, compares the pot surface temperature signal with the set temperature value, controls the opening of the proportional valve, and controls the pot surface temperature in the range of plus or minus 5 degrees Celsius of the set temperature value.

5. The intelligent tea production line according to any one of claims 1 to 8, characterized in that, The color selection machine is provided with three detection layers of upper, middle and lower, and is used for identifying and removing red rods, yellow pieces and broken pieces respectively.

6. A tea processing method based on the intelligent tea production line according to any one of claims 1-5, characterized in that, The method comprises the following steps: S1: feeding; S2: two-stage fixation based on first set parameters; S3: air selection; S4: moisture regeneration; S5: three-stage striping based on second set parameters; S6: drying and cooling based on third set parameters; S7: drying based on fourth set parameters; S8: air selection; S9: impurity removal based on multi-stage fine selection parameters.

7. The tea processing method according to claim 1, wherein The parameters of the two-stage fixation include at least one of the temperature control range 355℃-365℃, 280℃-290℃, 255℃-265℃, 155℃-165℃, and the frequency control range 920HZ-980HZ.

8. The tea processing method according to claim 1, wherein The parameters of the three-stage striping include at least one of the temperature control range 195℃-205℃, 180℃-190℃, 175℃-185℃, 165℃-175℃, and the frequency control range 860HZ-930HZ.

9. The tea processing method as claimed in claim 1, wherein, The multi-stage selection includes color selection, air selection, electrostatic dust removal and high magnetic iron removal. The color selection selects yellow pieces, broken pieces, scorched pieces, red rods, tea fruits and other impurities distinguished by color and shape through a color selector. The air selection selects stones, broken pieces, broken leaves and other impurities distinguished by mass through an air selection machine. The electrostatic dust removal removes foreign matters such as tea hairs, dust and hairs through an electrostatic dust removal machine. The high magnetic iron removal removes foreign matters such as iron filings through a high magnetic rod.

10. The tea processing method as claimed in claim 6, wherein, Before the feeding step, a step of spreading green leaves is further included, in which the fresh leaves are spread in a spreading tank for 4 to 8 hours. The spreading tank is provided with a temperature and humidity sensor, and data is connected to a numerical control center to realize monitoring and recording of the spreading process.

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