Tea leaf roasting device

Abstract

The present invention provides a tea leaf roasting device, comprising a box body used for placing roasted products. The tea leaf roasting device further comprises a heating device, and the heating device is located at a side part or a bottom part of the box body. A conversion structure is disposed between the heating device and the box body. The conversion structure comprises a base plate, and at least one side of the base plate is provided with a thermal wave conversion material. By using a thermal wave conversion layer and a material having negative ion and far-infrared emission functions configured on said layer, the present invention achieves an effect superior to that of charcoal roasting, and the temperature can be stably controlled for large-scale drying or roasting. In addition, the material of a resistance wire is improved and optimized, so as to further increase the generation of negative ions and far-infrared rays, resulting in tea leaves having better appearance, aroma, taste, and water-soluble extract content compared to those from charcoal roasting.

Description

Tea baking device Technical Field

[0001] The present invention relates to the field of tea processing equipment, and in particular to a tea baking device. Background Art

[0002] With the improvement of economic level, people's requirements for quality of life are getting higher and higher, and drinking tea as a leisure way to cultivate sentiment is becoming more and more popular; the traditional tea making process includes picking, spreading fresh leaves, withering, shaping, cooling and moisture recovery, initial drying, aroma enhancement, and drying, etc. Drying is the last process, which evaporates excess water in the tea leaves to promote the heating and aroma formation of the leaves, thereby enhancing and fixing the quality and facilitating storage.

[0003] Traditional tea is baked in a charcoal oven, and the far-infrared waves and partial negative ion effects of the charcoal heat radiation are used to ensure the good taste of the tea after baking, especially high-end tea. For this purpose, Chinese patent application number CN201320198419.3 discloses a drying device for baking tea in a charcoal oven, including a side enclosure and a baking panel arranged in the side enclosure for placing tea leaves; the baking panel is located in the middle and upper position of the side enclosure, and the diameter of the bottom surface of the side enclosure is adapted to the size of the baking oven; a layer of cloth is also provided on the baking panel to prevent small tea leaves from falling.

[0004] The above solution can ensure good tea quality, but it consumes a lot of wood and is difficult to achieve due to its low degree of automation. Automated electric baking of tea leaves can easily destroy the nutritional components of the tea leaves, leaving them dry and astringent. In view of this, the present invention is proposed. Technical issues

[0005] Problems solved by the present invention: Existing tea baking devices are unable to achieve automatic control of the baking device while ensuring the quality of the tea. The present invention improves the amount of negative ions and far-infrared rays generated during the drying or baking process of tea leaves by optimizing the heating resistance wire and utilizing the heat wave conversion material layer, thereby optimizing the quality of tea leaves. At the same time, compared with charcoal baking, the baking time and temperature of tea leaves can be stably controlled, which is conducive to the large-scale production of the baking process, saves a large amount of charcoal resources, and avoids environmental pollution caused by charcoal burning. At the same time, this baking equipment is also suitable for leaves, roots, stems, etc. of other plants and medicinal materials. Tea leaves are widely representative, so the following cases and corresponding descriptions are represented by tea leaves. Technical Solutions

[0006] To solve the above problems, the present invention provides a tea baking device, comprising a box for placing tea leaves, the tea baking device also comprising a heating device, the heating device being located at the side or bottom of the box, a conversion structure being arranged between the heating device and the box, the conversion structure comprising a substrate, and a heat wave conversion material being arranged on at least one side of the substrate.

[0007] This setting utilizes the heat wave conversion material in the conversion structure to simulate the far-infrared emission and negative ion release effects formed by the combustion of charcoal powder, and the tea produced is of excellent quality. The shape of the base can be set as needed, such as round or square. By providing a layer of heat wave conversion material, the negative ions and far-infrared emissivity effects generated are better than the effects of charcoal combustion heating; the baking time and temperature of the tea can be stably controlled, which is conducive to the large-scale production of the baking process, and a large amount of charcoal resources are saved, and the environmental pollution caused by charcoal combustion is avoided. The tea types include tea leaves suitable for baking, as well as leaves, roots, stems, etc. of other plants and medicinal materials.

[0008] Preferably, the tea baking device also includes a base, which is round or square and is located at the bottom of the box body. The box body and the box cover are sequentially arranged on the base, and the box cover is detachably connected to the box body. The heating device is arranged on the base or integrated into the conversion structure.

[0009] Preferably, the tea baking device also includes a box cover, one side of the box body is open, the box cover is located on the side of the box body and can selectively block the opening, the conversion structure is located on the side of the box body, and the heating device is arranged on the box body or integrated on the conversion structure.

[0010] Preferably, the heating device includes a carbon-based resistance wire, a ceramic resistance wire, or a graphene resistance wire, and the carbon-based resistance wire is made of carbon fiber or silicon carbide. By improving and optimizing the material of the resistance wire, the generation of negative ions and far-infrared rays is further increased, and the final appearance, aroma, taste, and water-soluble content of the tea leaves are all superior to those obtained by charcoal baking. Preferably, the temperature adjustment range of the heating device is 30-160°C. This setting allows for low-temperature drying or high-temperature baking as needed, and has a wide range of applications.

[0011] Preferably, the thermal wave conversion material is composed of at least one of carbon powder, quartz, carbon silicon material, ceramic, tourmaline, volcanic stone, and jade. Preferably, the thermal wave conversion material is composed of 50% tourmaline, 30% carbon powder, and 20% volcanic stone. Regarding far-infrared emission, the far-infrared emissivity of tourmaline, volcanic stone, and carbon powder is approximately 0.90 or higher, and the combined far-infrared emissivity is approximately 0.9-0.95, which is better than charcoal's approximately 0.7. The far-infrared emissivity of a metal resistance wire of equivalent strength is only approximately 0.5.

[0012] Preferably, the conversion structure includes an annular support platform, the annular support platform is located on the side of the base plate away from the box body, and the base plate is provided with a flange around the periphery, the flange extending away from the annular support platform. Preferably, the conversion structure also includes a first retaining rib, the first retaining rib is located on the side of the base plate close to the flange, and a limiting groove is formed between the flange and the first retaining rib for limiting the assembly of the box body.

[0013] Preferably, the annular support platform is trumpet-shaped, with the diameter of the circle surrounding one end of the annular support platform closest to the substrate being D1, and the diameter of the circle surrounding the other end being D2, where D1 < D2. This arrangement can focus the heat generated by the heating device, while also improving the stability and reliability of the assembly. Preferably, the substrate is provided with multiple through-holes, which facilitates heat transfer.

[0014] Preferably, the base includes a bottom wall and side walls, and the inner wall surface of the side wall is provided with a limit baffle, which is located above the heating device and is used to support the conversion structure. There are three limit baffles and they are evenly spaced along the circumference of the base. This arrangement is simple in structure and easy to produce and process.

[0015] Preferably, the teas include tea leaves suitable for baking, and leaves, roots, stems, etc. of other plants and medicinal materials. Beneficial effects

[0016] Compared to existing technologies, the tea drying device of the present invention has the following advantages: 1) By incorporating a heat wave conversion material, the device achieves superior negative ion and far-infrared emissivity compared to charcoal drying devices, resulting in high-quality tea and convenient large-scale drying. 2) By optimizing the material of the resistance wire, the device further increases the amount of negative ions generated, resulting in tea leaves with a better appearance, taste, and water extract content than charcoal drying devices. 3) The device can stably control the baking time and temperature of tea products, facilitating large-scale production of the baking process. It also significantly saves charcoal resources and avoids environmental pollution caused by charcoal combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is an overall schematic diagram of a tea-tea baking device according to an embodiment of the present invention;

[0018] FIG2 is an exploded view of a tea-tea roasting device according to an embodiment of the present invention;

[0019] FIG3 is another structural schematic diagram of the tea baking device according to an embodiment of the present invention;

[0020] FIG4 is a schematic structural diagram of a conversion structure according to an embodiment of the present invention;

[0021] FIG5 is another perspective view of the conversion structure according to the embodiment of the present invention;

[0022] FIG6 is a schematic structural diagram of a heating device according to an embodiment of the present invention;

[0023] FIG7 is an appearance diagram of tea leaves baked by different equipment in an experimental example of the present invention.

[0024] Description of reference numerals:

[0025] 1-base; 11-heating device; 111-heating plate bottom shell; 112-insulating heat insulation layer; 113-heating wire; 114-insulating ring; 115-temperature limiting device; 116-conductive sheet; 117-ceramic block; 118-temperature measuring probe; 12-knob; 13-switch; 14-limit baffle; 2-conversion structure; 21-annular support platform; 22-first baffle; 23-base plate; 231-flange; 24-limiting groove; 3-box body; 31-second baffle; 32-first rib; 33-second rib; 4-box cover. Best Mode for Carrying Out the Invention

[0026] To make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the technical features in the embodiments of the present invention can be combined with each other.

[0027] The traditional tea making method includes withering, rolling, fermentation, drying and other processes. Drying is a necessary procedure in tea making. If it is not handled properly, it will easily destroy the chlorophyll and make the tea leaves turn yellow, and have a significant impact on the taste of the tea. This is why mid-range and high-end teas are all dried in charcoal ovens.

[0028] With the improvement of living standards and the influence of China's unique tea culture, tea tasting has become an important way of communicating in life and work, and is increasingly popular. However, due to the large amount of wood used in charcoal drying ovens and limited production capacity, they can no longer meet the market demand for tea quality and supply. The heat radiation waves generated by the metal resistance wire when heating are mainly in the visible light and near / mid-infrared bands, while far-infrared waves are relatively rare and can easily directly burn the surface of the tea leaves, reducing the quality of the tea leaves. To this end, the applicant proposes the following technical solution:

[0029] A tea-roasting device comprises a base 1, a housing 3 and a lid 4 disposed sequentially on the base 1, and a conversion structure 2 disposed between the base 1 and the housing 3. The conversion structure 2 comprises a substrate 23, at least one side of which is provided with a thermal wave conversion material. This arrangement utilizes the thermal wave conversion material in the conversion structure 2 to simulate the far-infrared emission and negative ion release effects of burning charcoal powder, resulting in high-quality tea leaves. The base 1 also includes a circuit board, a heat dissipation structure, and other components. The specific structures and connections are conventional and are not described here.

[0030] As an example of the present invention, the tea baking device also includes a base 1, which is round or square and is located at the bottom of the box body 3. The box body 3 and the box cover 4 are arranged on the base 1 in sequence, and the box cover 4 is detachably connected to the box body 3. The heating device 11 is arranged on the base 1 or integrated on the conversion structure 2, as shown in Figures 1-4.

[0031] As another example of the present invention, the tea baking device also includes a box cover 4, one side of the box body 3 is open, the box cover 4 is located on the side of the box body 3 and can selectively block the opening, the conversion structure 2 is located on the side of the box body 3, and the heating device 11 is arranged on the box body 3 or integrated on the conversion structure 2, as shown in Figure 5.

[0032] As an example of the present invention, the thermal wave conversion material is composed of at least one of carbon powder, quartz stone, carbon silicon material, ceramics, tourmaline, volcanic stone, and jade. The carbon powder can be charcoal or fruit shell, bamboo charcoal powder. The thickness of the thermal wave conversion material is 1-5cm. Preferably, the thermal wave conversion material is composed of 50% tourmaline, 30% carbon powder, and 20% volcanic stone. As an example of the present invention, the thermal wave conversion material is mixed evenly and then bonded by adding an adhesive such as cement, and the particle size of the material is 80μm to 2cm. The far-infrared emissivity test instrument: TSS-5X is used to test the far-infrared emissivity of the thermal wave conversion material at room temperature. The test range is: emissivity in the range of 4-22 microns. The results are shown in Table 1 below;

[0033] Table 1: Far infrared emissivity test table

[0034] Product Name Sample 1 Sample 2 Sample 3 Average Tourmaline 0.92 0.94 0.90 0.92 Ceramic powder 0.89 0.91 0.90 0.90 Volcanic stone 0.91 0.90 0.91 0.91 Jade 0.88 0.90 0.89 0.89 Carbon powder 0.90 0.91 0.90 0.90 Charcoal 0.75 0.72 0.70 0.72 Nickel-iron alloy 0.50 0.50 0.51 0.50

[0035] A rough test using a portable negative oxygen ion detector (accuracy 0-50,000 / cubic centimeter) shows that the number of negative ions produced by charcoal combustion is about 1000-3000 / cm 3 , and the number of negative ions generated by the thermal wave conversion layer of the present invention is about 3000-8000 / cm 3 , while ordinary metal resistance wire generates positive charge and does not generate negative ions 3 As for the far-infrared emission effect, the far-infrared emissivity of tourmaline, volcanic stone, and charcoal powder is about 0.90 or above, and the far-infrared emissivity of their combination is about 0.90-0.95, which is better than charcoal at about 0.7. The far-infrared emissivity of metal resistance wire at the same strength is about 0.5.

[0036] As an example of the present invention, a heating device 11 is provided in the base 1, and the heating device 11 includes a carbon-based resistance wire, a ceramic resistance wire, and a graphene resistance wire, and the material of the carbon-based resistance wire is carbon fiber or silicon carbide. As another example of the present invention, the heating device 11 is provided in the conversion structure 2, and the heating device 11 is located in the lower layer of the thermal wave conversion material. This arrangement makes the heating device 11 and the conversion structure 2 modular, and the assembly efficiency is high. The temperature adjustment range of the heating device 11 is 30-160°C, and it can be dried at low temperature or baked at high temperature as needed, and has a wide range of applications.

[0037] As an example of the present invention, the base 1 is circular and is provided with a knob 12 and a switch 13. A heating device 11 is provided within the base 1. The knob 12 is electrically connected to the switch 13 and the heating device 11. The heating device 11 is energized by turning on the switch 13, and the current in the heating device 11 is adjusted by turning the knob 12 to control the heating temperature.

[0038] Preferably, a limit baffle 14 is provided on the inner wall surface of the base 1, and the limit baffle 14 is located above the heating device 11 and is used to support the conversion structure 2. This setting structure is simple and convenient for production and processing. As an example of the present invention, there are three limit baffles 14 and they are evenly spaced along the circumference of the base 1. This setting structure is simple and convenient for production and processing. The limit baffle 14 is connected to the base 1 by screwing or clamping. This setting facilitates the fixation of the heating device 11 and facilitates maintenance.

[0039] As an example of the present invention, the conversion structure 2 includes a base plate 23, an annular support platform 21 is provided on one side of the base plate 23, and a flange 231 is provided around the periphery of the base plate 23, the flange 231 extending away from the annular support platform 21. Preferably, the conversion structure 2 also includes a first retaining rib 22, the first retaining rib 22 is located on a side of the base plate 23 close to the flange 231, and a limiting groove 24 is formed between the flange 231 and the first retaining rib 22 for limiting the assembly of the box body 3.

[0040] Preferably, the annular support platform 21 is trumpet-shaped. The diameter of the circle surrounding the end of the annular support platform 21 closest to the substrate 23 is D1, and the diameter of the circle surrounding the other end of the annular support platform 21 is D2, where D1 < D2. This arrangement can focus the heat generated by the heating device 11, while improving the stability and reliability of the assembly. Preferably, the substrate 23 is provided with multiple through-holes. This arrangement facilitates heat transfer.

[0041] Preferably, the height of the first retaining rib 22 is H1, and the height of the flange 231 is H2, where H1>H2. This arrangement allows the first retaining rib 22 to guide the assembly of the box body 3, improving assembly efficiency. Furthermore, the upper end surface of the first retaining rib 22 abuts against the box body 3, making assembly more stable.

[0042] As an example of the present invention, the box body 3 is generally thin in the middle and narrow at both ends, and a second retaining rib 31 is provided on its outer periphery, with the lower end surface of the second retaining rib 31 abutting the flange 231. This arrangement allows all the heat generated by the heating device 11 to act on the tea leaves within the box body 3, resulting in high thermal energy utilization. Preferably, a first rib 32 and a second rib 33 are provided on the outer side of the box body 3, and the first rib 32 and the second rib 33 are arranged to intersect. This arrangement can improve the mechanical strength of the box body 3, and the simple structure facilitates production and processing. Preferably, the box body 3 is processed from bamboo strips.

[0043] As an example of the present invention, the heating device 11 includes a heating plate bottom shell 111 and a heating wire 113. An insulating heat insulation layer 112 is provided on the heating plate bottom shell 111. The heating wire 113 is provided on the insulating heat insulation layer 112. An insulating ring 114 is provided on the outer periphery of the heating wire 113. The insulating heat insulation layer 112 and the insulating ring 114 are made of ceramic material.

[0044] The heating wire 113 is a spring-shaped wire wound with a round metal conductive wire, and is prepared by the following method: select the diameter range of the metal conductive wire according to the electrical parameter requirements; select the screw diameter required for winding the metal conductive wire according to the area and winding length; wind the metal conductive wire around the screw to form a spring shape; lay the heating wire 113 into the disk and fix it with a fixing piece. The heating wire 113 is preferably laid in a concentric ring shape. After the heating wire 113 is installed, it is connected to the working circuit through the conductive sheet 116, and the conductive sheet 116 is fixed on the ceramic block 117. The heating wire 113 is wound with a round metal conductive wire, which can reduce material costs and processing costs, because the material requirements are relatively low, the resistivity requirements are not so high, and the round wire is easier to prepare than the flat strip. During the preparation process, the material utilization rate will be higher, and there is basically no loss, which has the effect of reducing consumption and protecting the environment.

[0045] A temperature probe 118 is provided at the center of the heating wire 113 and is connected to the temperature limiting device 115. The heating wire 113 is wound with a round graphene conductive filament. The round graphene conductive filament does not require a specific high resistance value and resistivity, and the material is not damaged during the winding process. This results in a high yield rate, high material utilization, and virtually no loss, thus reducing energy consumption and protecting the environment. Furthermore, the wound wire has a long service life.

[0046] The same batch of tea leaves was baked at 95°C for 10 hours using the tea drying oven, electric drying oven with metal heating wire, and charcoal drying oven described in this application. The appearance of the dried tea leaves is shown in Figure 7. According to the tea quality evaluation method, the dried tea leaves were brewed with hot water. The brewing method is to accurately weigh 3-5 grams of tea sample and place it in a prepared evaluation cup. The tea is then brewed with 100°C boiling water for 5 minutes, with a tea-to-water ratio of 1:50. The boiling water is poured in, the lid is covered, and the time is accurately measured. After the brewing time is reached, the tea soup is drained in time. The tea soup is then evaluated in the following order: color of the soup, aroma, flavor, and leaf bottom. At the same time, the water extract of the brewed tea is tested. Three parallel samples are taken for each sample. The results are shown in Table 2. The relevant testing methods are all existing technologies and will not be described in detail here.

[0047] Table 2 Appearance, aroma, taste and extract content of tea leaves roasted with different equipment

[0048]

[0049] As can be seen from the table above, the color of tea leaves prepared by charcoal baking changes from green leaves to slightly burnt yellow, the color of tea leaves baked using metal resistance wire changes from green leaves to burnt yellow, and the color of tea leaves baked in the tea drying cage described in the present application changes from green leaves to slightly burnt yellow, with some green leaves, and it is clear that the green color of the leaves is still retained; the water extract of tea leaves prepared by charcoal baking is slightly better than that of tea leaves baked using electric baking, but the water extract of tea leaves baked using the tea drying furnace described in the present application is significantly higher than both. When baking tea leaves using the tea drying cage described in the present application, it can both improve baking efficiency and ensure good tea quality.

[0050] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A tea baking device, comprising a box (3) for placing baked products, characterized in that: The tea leaf roasting device further comprises a heating device (11), wherein the heating device (11) is located at the side or bottom of the box (3), a conversion structure (2) is arranged between the heating device (11) and the box (3), and the conversion structure (2) comprises a substrate (23), and a thermal wave conversion material is arranged on at least one side of the substrate (23).

2. The tea baking device according to claim 1, characterized in that: The drying device further comprises a base (1), the base (1) is circular or square and is located at the bottom of the box body (3), the box body (3) and the box cover (4) are arranged on the base (1) in sequence, the box cover (4) and the box body (3) are detachably connected, and the heating device (11) is arranged on the base (1) or integrated on the conversion structure (2).

3. The tea baking device according to claim 1, characterized in that: The baking device further comprises a box cover (4); one side of the box body (3) is open; the box cover (4) is located on the side of the box body (3) and is capable of selectively blocking the opening; the conversion structure (2) is located on the side of the box body (3); and the heating device (11) is arranged on the box body (3) or integrated on the conversion structure (2).

4. The tea baking device according to any one of claims 1 to 3, characterized in that: The heating device (11) comprises a carbon-based resistance wire, a ceramic resistance wire, or a graphene resistance wire, and the carbon-based resistance wire is made of carbon fiber or silicon carbide.

5. The tea baking device according to claim 4, characterized in that: The temperature adjustment range of the heating device (11) is 30-160°C.

6. The tea baking device according to claim 1, characterized in that: The thermal wave conversion material is composed of at least one of carbon powder, quartz stone, carbon silicon material, ceramics, tourmaline, volcanic stone and jade.

7. The tea baking device according to claim 6, characterized in that: The thermal wave conversion material consists of 50% tourmaline, 30% carbon powder and 20% volcanic stone.

8. The tea baking device according to claim 1, characterized in that: The tea leaves include tea leaves suitable for baking, and leaves, roots, stems, etc. of other plants and medicinal materials.

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