White tea withering bed with uniform wind structure

Abstract

The present application belongs to the technical field of tea processing equipment, and particularly relates to a white tea withering bed with uniform air distribution structure. The white tea withering bed comprises a bed frame, a tea spreading bed surface fixedly arranged on the upper portion of the bed frame and used for spreading tea, a uniform air distribution box arranged below the tea spreading bed surface and provided with an air inlet at the bottom, an axial flow fan installed at the air inlet and used for sending air into the uniform air distribution box, a set of guide plates arranged inside the uniform air distribution box between the air inlet and the tea spreading bed surface and used for uniformly guiding air flow to each region of the tea spreading bed surface, and a control system electrically connected with the axial flow fan and used for adjusting the rotating speed of the axial flow fan. The uniform air distribution box and the set of guide plates are arranged to decompose concentrated air flow into multiple points of uniform air outlet, so that the speed difference of air in each region of the tea spreading bed surface is greatly reduced, and the problem of uneven withering is effectively avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of tea processing equipment, and specifically relates to a white tea withering bed with a uniform airflow structure. Background Technology

[0002] White tea is one of the six traditional tea categories in my country. Its production process involves neither frying nor rolling, relying mainly on withering and drying. Among these, withering is the key step in determining the quality of white tea, directly affecting the color, aroma, taste, and the transformation of its internal substances.

[0003] Currently, white tea withering mainly employs natural withering, sun withering, and combined withering methods. Natural withering is typically carried out in withering troughs or withering beds, where fresh leaves are evenly spread on sieves or bed surfaces, relying on natural ventilation or simple fans to help them lose moisture. However, existing withering equipment generally suffers from the following problems:

[0004] Uneven airflow distribution: Traditional withering beds often use bottom openings or single-point air intake, which leads to large differences in airflow velocity in different areas of the bed surface. The rate of water loss of tea leaves is inconsistent between the edge and the middle, and between the near air vent and the far air vent, resulting in uneven withering.

[0005] Therefore, developing a white tea withering bed that can achieve uniform airflow distribution is of great significance for improving the consistency and quality of white tea processing. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the aforementioned problems in the prior art, the present invention provides a white tea withering bed with a uniform airflow structure.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solution adopted by the present invention includes: a white tea withering bed with a uniform airflow structure, comprising a bed frame; a leaf-spreading bed surface, fixedly disposed on the upper part of the bed frame for spreading tea leaves; a uniform airflow box body disposed below the leaf-spreading bed surface, with an air inlet at its bottom; an axial flow fan installed at the air inlet for supplying air into the uniform airflow box body; a guide plate assembly disposed inside the uniform airflow box body, located between the air inlet and the leaf-spreading bed surface, for uniformly guiding the airflow to various areas of the leaf-spreading bed surface; and a control system electrically connected to the axial flow fan for adjusting the rotational speed of the axial flow fan.

[0010] Furthermore, the uniform air box has a conical structure.

[0011] Furthermore, the deflector assembly includes a first deflector and a second deflector. The first deflector and the second deflector are circular. The first deflector has a first grid structure with concentric circles, and the second deflector has a second grid structure with a grid-like distribution. The first deflector is located below the second deflector.

[0012] Furthermore, the leaf spreading bed surface is a stainless steel screen or a stainless steel perforated plate with a hole diameter of 0.5mm-2mm.

[0013] Furthermore, the control system includes a controller and a frequency converter, and the axial flow fan is a variable frequency axial flow fan.

[0014] Furthermore, the control system also includes a temperature and humidity sensor, which is located above the leaf spreading bed or inside the air distribution box, for real-time monitoring of withering environmental parameters and feedback to the control system.

[0015] (III) Beneficial Effects

[0016] The beneficial effects of this invention are: by setting up a uniform air distribution box and a guide plate assembly, the concentrated airflow is decomposed into multiple points of uniform air outlet, which greatly reduces the wind speed difference in different areas of the leaf bed and effectively avoids the problem of uneven withering. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the white tea withering bed with uniform airflow structure according to the present invention;

[0018] Figure 2 A schematic diagram of the first guide plate of the white tea withering bed with uniform airflow structure of the present invention;

[0019] Figure 3 A schematic diagram of the second guide plate of the white tea withering bed with uniform airflow structure of the present invention;

[0020] Figure 4 A schematic diagram of the leaf spreading bed surface of the white tea withering bed with uniform airflow structure of the present invention.

[0021] [Explanation of Labels in the Attached Image]

[0022] 1. Axial flow fan; 2. First guide vane; 3. Second guide vane; 4. Air distribution box; 5. Leaf bed surface; 6. Bed frame. Detailed Implementation

[0023] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The bed frame 1 is made of stainless steel square tubing welded together, with overall dimensions of 3m in length, 1.5m in width, and 0.8m in height. The top of the bed frame 1 is fixedly installed with a leaf-spreading surface 5, which is welded together. The leaf-spreading surface 5 is made of 304 stainless steel perforated plate with a hole diameter of 1mm and an opening rate of 35%, ensuring air permeability while preventing tea leaves from falling.

[0025] A uniform air distribution box 4 is fixedly installed below the leaf spreading bed 5. The uniform air distribution box 4 has a height of 0.3m, and its upper part is welded to the bottom surface of the leaf spreading bed 5. An air inlet is opened at the center of the bottom of the uniform air distribution box 4, and an axial flow fan 1 is installed at the air inlet 8. In this embodiment, the axial flow fan 1 is a variable frequency axial flow fan 1 with a rated power of 0.75kW, an adjustable air volume range of 1500~4500 m³ / h, and an adjustable wind speed range of 0.8~2.5 m / s.

[0026] The air distribution box 4 is equipped with a baffle plate assembly. For example... Figure 1 , 2 As shown, the guide vane assembly includes a first guide vane 2 and a second guide vane 3. The first guide vane 2 and the second guide vane 3 are 100-200mm apart. The air distribution box 4 has a conical structure with its apex facing downwards, located directly above the air inlet, and is used to evenly distribute the vertical airflow blown by the axial flow fan 1 in all directions. The first guide vane 2 is circular and has a first grid structure distributed in concentric circles, with a height of 50mm. Its edge is welded and fixed to the air distribution box 4, further guiding the airflow to various areas of the bed surface.

[0027] The second guide vane 3 is circular and has a grid-like second mesh structure. For example... Figure 3 As shown, the second guide plate 3 is composed of interlaced thin plates forming several square grid holes. The grid holes are 50mm × 50mm in size and 50mm in height, and their edges are welded and fixed to the air distribution box 4. The second guide plate 3 is used to perform secondary rectification of the airflow, eliminate the local eddies generated by the guide plate, and make the air velocity distribution more uniform.

[0028] The control system includes a PLC controller, a frequency converter, and a touch screen. Operators can set the wind speed curves for each stage of withering on the touch screen based on the white tea variety (such as Fuding Da Bai Cha, Zhenghe Da Bai Cha, etc.), the moisture content of the fresh leaves, and the ambient temperature and humidity. The control system automatically adjusts the speed of the axial flow fan 1 according to the settings. Simultaneously, a temperature and humidity sensor (not shown) is installed inside the air distribution box 4 to monitor the inlet air temperature and humidity in real time and feed the data back to the control system for closed-loop regulation.

[0029] During operation, fresh leaves are evenly spread on the leaf spreading bed 5, with a thickness of 2-3 cm. The axial flow fan 1 is started, and the airflow enters the uniform air distribution box 4 through the air inlet. First, the airflow is dispersed outwards from the uniform air distribution box 4, then evenly distributed to each area of ​​the uniform air distribution box 4 via the first guide plate 2. It then passes through the second guide plate 3 for rectification, and finally distributes upwards at a uniform speed across the leaf spreading bed 5, fully contacting the tea leaves and removing moisture. Throughout the withering process, the operator can adjust the airflow speed on the control system according to the tea's condition. For example, a higher airflow speed (1.5-2.0 m / s) is used in the early stage to quickly remove surface moisture; the airflow speed is reduced (1.0-1.5 m / s) in the middle stage to promote the transformation of internal substances; and the airflow speed is appropriately increased (1.5-2.0 m / s) in the later stage to evenly remove moisture until the withering is moderate.

[0030] Actual production verification shows that after adopting the withering bed of this embodiment, the difference in moisture content of tea leaves in different areas of the bed surface is reduced from ±5% in the traditional withering bed to ±1.5%. The color and softness of the withered leaves are consistent, and the white tea produced has a complete appearance, clear soup color, fresh and mellow taste, and the quality is significantly improved.

[0031] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A white tea withering bed with a uniform airflow structure, characterized in that, include: bedstead; A leaf-spreading bed is fixedly installed on the upper part of the bed frame and is used to spread tea leaves. An air distribution box is located below the leaf bed surface, and an air inlet is provided at its bottom; An axial flow fan is installed at the air inlet to supply air into the air distribution box. The airflow guide plate assembly is disposed inside the air distribution box, located between the air inlet and the air distribution plate. Between the leaf bed surfaces, used to evenly guide airflow to various areas of the leaf bed surface; The control system is electrically connected to the axial flow fan and is used to adjust the speed of the axial flow fan.

2. The white tea withering bed with a uniform airflow structure according to claim 1, characterized in that, The uniform air box has a conical structure.

3. The white tea withering bed with a uniform airflow structure according to claim 2, characterized in that, The deflector assembly includes a first deflector and a second deflector. The first deflector and the second deflector are circular. The first deflector has a first grid structure with concentric circles, and the second deflector has a second grid structure with a grid-like distribution. The first deflector is located below the second deflector.

4. The white tea withering bed with a uniform airflow structure according to claim 1, characterized in that, The leaf spreading bed surface is a stainless steel screen or a stainless steel perforated plate with a hole diameter of 0.5mm-2mm.

5. The white tea withering bed with a uniform airflow structure according to claim 1, characterized in that, The control system includes a controller and a frequency converter, and the axial flow fan is a variable frequency axial flow fan.

6. The white tea withering bed with a uniform airflow structure according to claim 1 or 5, characterized in that, The control system also includes a temperature and humidity sensor, which is located above the leaf spreading bed or inside the air distribution box, for real-time monitoring of withering environmental parameters and feedback to the control system.

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