A method for making tea by spreading and wilting

Abstract

A method for withering tea leaves, using withering equipment including a fan (2), a temperature sensor (3), a control box (5), a heating tube (7), and a frame (8), wherein a perforated plate (1) is arranged in the frame (8) to form a trough, and a guide plate (4) is set below the perforated plate (1). The method includes the following steps: starting the control box (5) and measuring and determining the correspondence between the wind speed and the frequency of the fan (2) in segments; spreading the fresh tea leaves flat on the perforated plate (1), controlling the thickness of the spread tea leaves to ensure uniform spreading; setting the direction and wind speed parameters of the fan (2), and starting the fan (2) and the heating tube (7); repeating the blowing process of the fan (2) and the heating process of the heating tube (7) according to the direction and wind speed parameters set in step three until withering is completed. This achieves parameterized and precise control of the withering process.

Description

Technical Field

[0001] This invention relates to a method for withering tea leaves, belonging to the field of tea processing technology. Background Technology

[0002] Spreading is the first crucial step after picking fresh tea leaves, and its quality directly affects the quality of subsequent tea processing. The core requirement is to maintain an appropriate water loss rate in the fresh leaves without damaging them, thus laying the foundation for subsequent withering, fixation, and other processes.

[0003] Currently, traditional withering processes mostly employ a tiered rack system. The entire withering process lacks effective control methods and is considered a crude operation. This method has the following problems: First, significant temperature and humidity differences between the upper and lower racks lead to uneven water loss rates and inconsistent withering degrees, thus affecting the uniformity of tea's taste, aroma, and other quality indicators. Second, to ensure even withering and water loss, frequent manual turning of the fresh leaves is necessary. This not only easily causes mechanical damage to the leaves, destroying internal nutrients and cell structure, but also consumes a large amount of labor. Furthermore, the subjective nature of manual operation makes it difficult to achieve standardized control of the withering process. Third, traditional withering devices have simple structures but weak control capabilities, failing to precisely adjust withering parameters according to different tea varieties and the state of the fresh leaves, further exacerbating quality fluctuations. Therefore, the traditional withering process has long suffered from numerous pain points, hindering the stable improvement of tea quality and the optimization of production efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing a method for withering and processing tea leaves.

[0005] To achieve the above objectives, the technical solution of the present invention is: a tea leaf withering method, wherein the tea leaf withering equipment includes a fan, a temperature sensor, a control box, a heating tube, and a frame. A perforated plate forms a trough in the frame, and a guide plate is installed below the perforated plate. The fan is speed-adjustable and has bidirectional rotation function. The temperature sensor is used to measure the temperature of the tea leaves during withering. The control box is equipped with a touch screen. The fan, temperature sensor, and heating tube are all connected to the control box. The control box receives information from the temperature sensor and sends control commands to the heating tube, including the following steps: Step 1, start the control box and measure and determine the correspondence between wind speed and fan frequency in segments; Step 2, spread the fresh tea leaves flat on the perforated plate, controlling the thickness of the spread leaves to ensure uniform spreading; Step 3, set the fan direction and wind speed parameters, and start the fan and heating tube; Step 4, repeat the fan blowing and heating process according to the fan direction and wind speed parameters set in Step 3 until withering is completed.

[0006] The thickness of the fresh tea leaves spread in step one is 100mm-150mm.

[0007] The specific process in step two is as follows: First, the fan rotates forward for 30-50 minutes at a speed of 0.3-0.5 m / s. During this time, the fan rotates forward, and the airflow blows from the fan into the trough, first passing through the heating tube. The control box controls the opening and closing of the heating tube according to the information transmitted by the temperature sensor, so that the hot air temperature is controlled at 10 degrees Celsius and the airflow speed is 0.3-0.5 m / s. The airflow is directed to the bottom of the perforated plate by the air guide plate, and the airflow flows from bottom to top through the spread tea leaves. Then the fan stops rotating for 5-10 minutes. The fan is then started to rotate in the reverse direction for 30-60 minutes at a speed of 0.2 m / s. At this time, the airflow is drawn in through the upper surface of the fresh tea leaves, passes through the fresh tea leaves, and flows out through the fan under the combined action of the air guide plate and the frame.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] 1. Compared with traditional processes, this method does not require manual turning of fresh leaves. Through negative pressure suction and precise temperature and humidity control, the fresh leaves can lose water evenly, minimizing mechanical damage to the fresh leaves, preserving the internal nutrients and aroma substances of the tea leaves, and significantly improving the final quality of the tea.

[0010] 2. This method is easy to implement. The perforated plate, fan, control box, heating tube and other devices used for tea withering are simple in structure, low in cost, and easy to adapt to existing tea processing production lines without the need for large-scale equipment modification.

[0011] 3. This method can achieve fully automated operation. By pre-setting parameters, the airflow, temperature, humidity and suction interval time can be precisely controlled. No manual intervention is required throughout the process, which greatly saves labor costs. At the same time, it can standardize and regulate the spreading process and ensure the stability of the quality of different batches of tea. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the tea-withering equipment in this invention.

[0013] Figure 2 This is an isometric view of the tea-spreading and withering equipment in this invention.

[0014] Figure 3 This is a top view of the tea leaf spreading and withering equipment in this invention.

[0015] Figure 4 This is a left view of the tea-spreading and withering equipment in this invention.

[0016] In the diagram, 1 is the perforated plate, 2 is the fan, 3 is the temperature sensor, 4 is the air guide plate, 5 is the control box, 6 is the touch screen, 7 is the heating element, 8 is the frame, and 9 is the casters. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] See Figures 1 to 4 A method for processing tea leaves by withering is disclosed. The withering equipment includes a fan 2, a temperature sensor 3, a control box 5, a heating element 7, and a frame 8. The control box 5 is equipped with a touch screen 6. A perforated plate 1 is arranged in the frame 8 to form a groove. The width of the perforated plate 1 is preferably 850-1200mm, the length is 5-6 meters, and the diameter of the perforations is 2.5mm-3mm. A guide plate 4 is installed below the perforated plate 1. The fan 2 is speed-adjustable and has bidirectional rotation function. The guide plate 4 and the fan 2 constitute an airflow control system. The fan 2, temperature sensor 3, and heating element 7 are all connected to the control box 5. The control box 5 receives information from the temperature sensor 3 and sends control commands to the heating element 7.

[0019] See Figures 1 to 4 The tea leaf withering method includes the following steps: Step 1, start the control box 5, measure and determine the correspondence between wind speed and fan 2 frequency in segments, and record the results in the control box 5; Step 2, spread the fresh tea leaves evenly on the perforated plate 1, control the thickness of the spread leaves, and ensure uniform spreading; Step 3, set the fan 2 rotation direction and wind speed parameters, and start the fan 2 and heating tube 7; Step 4, repeat the fan 2 blowing and heating tube 7 heating process according to the fan 2 rotation direction and wind speed parameters set in Step 3 until withering is complete. The control box 5 records the process data for each step, scores the withering results, and records the scores in the control box 5. This data is processed by a neural network algorithm to determine the optimal control sequence and time for fresh leaves with different seasons, varieties, and mechanical compositions.

[0020] See Figures 1 to 4 Specifically, the thickness of the fresh tea leaves spread in step one is 100mm-150mm.

[0021] See Figures 1 to 4 Specifically, the process in step two is as follows: First, the fan 2 is set to rotate forward for 30-50 minutes at a wind speed of 0.3-0.5 m / s. At this time, the fan 2 rotates forward, and the airflow blows from the fan 2 into the trough, first passing through the heating tube 7. The control box 5 controls the opening and closing of the heating tube 7 based on the information transmitted by the temperature sensor 3, controlling the hot air temperature to 30-40 degrees Celsius and the airflow speed to 0.3-0.5 m / s. The airflow is directed by the air guide plate 4 to the bottom of the perforated plate 1, flowing upwards through the spread tea leaves. Then, the fan 2 stops rotating for 5-10 minutes. The fan 2 is then started to rotate in the reverse direction for 30-60 minutes at a wind speed of 0.2 m / s. At this time, the airflow is drawn in through the upper surface of the fresh tea leaves, passes through the fresh tea leaves, and flows out through the fan 2 under the combined action of the air guide plate 4 and the frame 8.

[0022] See Figures 1 to 4 This tea-withering method uses a perforated plate 1 as the fresh leaf spreading platform, strictly controlling the thickness of the spread leaves to ensure uniform initial spreading. Heating pipes 7, in conjunction with an airflow control system, allow for precise adjustment of the airflow speed, temperature, and humidity via a control box 5. This standardizes and parametrically controls the withering process, eliminating reliance on weather conditions and experience, and improving tea quality. Simultaneously, the intermittent top-down airflow effectively balances the temperature and humidity across the perforated plate 1 and different areas, completely resolving the uneven temperature and humidity issues of traditional shelf-based withering. Furthermore, the fresh leaves are not turned or damaged during withering, maximizing their integrity and laying a solid foundation for subsequent processes. This method solves the long-standing industry problems of uniformity and controllability, while simultaneously protecting fresh leaves, improving quality, and reducing costs.

[0023] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such structures should be considered within the protection scope of the present invention.

Claims

1. A kind of tea spreading and withering production method, the tea spreading and withering equipment used includes fan (2), temperature sensor (3), control box (5), heating pipe (7), rack (8), the rack (8) is arranged with hole plate (1) and forms groove body, the hole plate (1) below is provided with air deflector (4), the fan (2) can be adjusted speed with bidirectional rotation function, the temperature sensor (3) is used to measure tea withering temperature, the control box (5) is provided with touch screen (6) on, the fan (2), temperature sensor (3), heating pipe (7) are all connected with control box (5), the control box (5) receives temperature sensor (3) information and sends control instruction to heating pipe (7), its characterized in that, Includes the following steps: Step 1: Start the control box (5) and measure in segments to determine the relationship between wind speed and frequency of fan (2); Step 2: Spread the fresh tea leaves evenly on the perforated plate (1), control the thickness of the spread of the fresh tea leaves, and ensure that the spread is even; Step 3: Set the rotation direction and wind speed parameters of the fan (2), and start the fan (2) and the heating tube (7); Step 4: Based on the fan (2) direction and wind speed parameters set in Step 3, repeat the fan (2) blowing and heating pipe (7) heating process until withering is completed.

2. The method for withering tea leaves according to claim 1, characterized in that: The thickness of the fresh tea leaves spread in step one is 100mm-150mm.

3. The method for withering tea leaves according to claim 1, characterized in that, The specific process in step two is as follows: First, the fan (2) rotates in the forward direction for 30-50 minutes, and the wind speed is 0.3-0.5 m / s; at this time, the fan (2) rotates in the forward direction, and the airflow blows from the fan (2) to the tank. It first passes through the heating tube (7). The control box (5) controls the opening and closing of the heating tube (7) according to the information transmitted by the temperature sensor (3), so that the hot air temperature is controlled at 30-40 degrees Celsius and the airflow speed is 0.3-0.5 m / s; the airflow is directed through the air guide plate (4) to the bottom of the perforated plate (1), and the airflow flows from bottom to top through the spread tea leaves; Then the fan (2) stops rotating and remains stopped for (5-10) minutes; Start the fan (2) and rotate it in the opposite direction for 30-60 minutes. The wind speed is 0.2 m / s. At this time, the airflow is drawn in through the upper surface of the fresh tea leaves, passes through the fresh tea leaves, and flows out through the fan (2) under the combined action of the air guide plate (4) and the frame (8).

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