Control method of tea leaf fixation system

Abstract

The invention relates to a control method of a tea leaf fixation system, the control method is applied to the tea leaf fixation system, and the control method comprises the following steps: acquiring humidity data of to-be-fried tea leaves on a halogen moisture meter on a detection belt, and when the humidity data is reduced to target humidity, controlling a fixation barrel to be opened; when it is detected that the internal temperature of the fixation barrel reaches a target temperature, controlling a detection belt to move so as to convey the tea leaves to be fried to a lifting belt; and controlling the homogenizing roller and the lifting belt to operate according to the target control parameters, and controlling the fixation barrel to rotate at the target rotating speed, so that the tea leaves to be fried are fed into a feeding hole of the fixation barrel at the first, second and third discharging speeds. The system is controlled to operate based on the water content and grade of the tea leaves, automatic transportation and fixation operation are realized, a better fixation effect is realized in a fixation barrel through three-stage heating pan-firing and regulation and control of the tea leaf feeding amount in the process, uniform heating and sufficient fixation of the tea leaves are ensured, more aroma and nutritional ingredients are retained, and meanwhile, the overall quality and taste of the tea leaves are improved.

Description

Technical Field

[0001] The present application relates to the technical field of tea processing, and in particular to a control method for a tea withering system. Background Art

[0002] Killing the green tea is one of the primary processes of tea production. Its main purpose is to destroy and passivate the oxidase activity in fresh leaves through high temperature, inhibit the enzymatic oxidation of tea polyphenols in fresh leaves, evaporate part of the moisture in fresh leaves, soften the tea leaves, and facilitate rolling and shaping. At the same time, it emits a green smell and promotes the formation of a good aroma. The killing methods include: frying, steaming, and soaking. Killing the green tea generally follows the principles of "high temperature killing, high temperature first and low temperature later; killing old leaves tenderly, and killing tender leaves tenderly".

[0003] Currently, when using a stir-frying device to wither tea leaves, manual experience is mainly used to control the start and stop of the device and the stir-frying time. On the one hand, there is a large degree of subjectivity, which can easily lead to situations such as burnt tea leaves and incomplete withering, affecting the quality of the tea leaves. On the other hand, a large amount of labor is consumed, and improvements are needed to reduce manual intervention and improve the quality of withering. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a control method for a tea withering system. The system controls the operation based on the grade and moisture content of the tea leaves to realize automatic transportation and withering operations.

[0005] The first aspect of the present application provides a control method for a tea-withering system, which is applied to the tea-withering system. The tea-withering system includes a detection belt, a lifting belt, a withering barrel, and a controller connected in sequence. The detection belt is used for preliminarily drying tea leaves to be fried and detecting the humidity of the tea leaves. The lifting belt is provided with a material-leveling roller for adjusting the material flow rate. The withering barrel is provided with a photoelectric sensor for detecting the position of the material and a temperature sensor for detecting the temperature of each section. The control method includes:

[0006] First, the humidity data of the tea leaves to be fried is obtained by using a halogen moisture meter on the detection belt. When the humidity data drops to the target humidity, the withering barrel is controlled to open;

[0007] Secondly, when it is detected that the internal temperature of the withering barrel has reached the target temperature, the detection belt is controlled to move to transfer the tea leaves to be fried to the lifting belt; the target temperature of the withering barrel is 300℃ for the first stage, 280℃ for the second stage, and 240℃ for the third stage.

[0008] Thirdly, the material distribution roller and the lifting belt are controlled to run at the target control parameters, and the withering barrel is controlled to rotate at the target speed. The target control parameters enable the tea leaves to be fried to be fed to the inlet of the withering barrel at the first discharging speed. The target speed of the withering barrel is 2-3 seconds / revolution, and the first discharging speed is 400kg / h.

[0009] Among them, controlling the material distribution roller and the lifting belt to operate with target control parameters includes:

[0010] The material distribution roller is controlled to be lifted to the first material position, and the lifting belt is controlled to run at the first transport speed, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the first discharging speed.

[0011] Once again, when the second-stage material arrival signal sent by the photoelectric sensor is detected, the height of the material distribution roller and the speed of the lifting belt are lowered, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the second discharging speed;

[0012] Among them, lowering the height of the material distribution roller and increasing the speed of the belt include:

[0013] The material distribution roller is controlled to descend to the second material position, and the lifting belt is controlled to slow down so that the lifting belt runs at the second transport speed, so that the tea leaves to be fried can be fed into the feeding port of the withering barrel at the second discharging speed, and the second discharging speed is 300kg / h.

[0014] Finally, when the three-stage material arrival signal sent by the photoelectric sensor is detected, the tea grade of the tea to be fried is determined, the target discharge speed of the fried tea leaves is determined according to the tea grade, and the material distribution roller and the lifting belt are controlled to operate with the control parameters corresponding to the target discharge speed.

[0015] Among them, the tea grades to be fried are divided into first-grade tea and second-grade tea. The first-grade tea includes single bud and one bud and one leaf, and the second-grade tea includes one bud and two leaves and one bud three leaves or more.

[0016] Among them, determining the target discharging speed of the tea leaves according to the grade of the tea leaves, and controlling the material distribution roller and the lifting belt to operate at the control parameters corresponding to the target discharging speed include:

[0017] When the tea grade is first-grade tea, the material distribution roller is controlled to move to the third material position, and the lifting belt is controlled to run at the third transport speed, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the third discharging speed, and the third discharging speed is 180kg / h;

[0018] And, when the tea grade is second-grade tea, the material distribution roller is controlled to move to the fourth material position, and the lifting belt is controlled to run at the fourth transport speed, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the fourth discharging speed, and the fourth discharging speed is 220kg / h. The technical solution provided by the present application may have the following beneficial effects:

[0019] The present application provides a control method for a tea withering system, which controls the operation of the system based on the moisture content and grade of the tea leaves to achieve automatic transportation and withering operations. During the process, three-stage heating and frying are performed and the amount of tea leaves fed is adjusted to achieve a better withering effect in the withering barrel, ensuring that the tea leaves are heated evenly and fully withered, retaining more aroma and nutrients, while improving the overall quality and taste of the tea leaves, effectively avoiding situations such as burnt frying and incomplete withering, reducing manual intervention, and effectively improving the withering quality.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0022] Figure 1 It is a flow chart of the control method shown in the embodiment of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0028] A control method for a tea leaf withering system is applied to the tea leaf withering system. The tea leaf withering system comprises a detection belt, a lifting belt, a withering bucket and a controller connected in sequence. The detection belt is used for preliminarily drying tea leaves to be fried and detecting the moisture of the tea leaves. The tea leaves to be fried are laid horizontally on the detection belt so that the moisture in the tea leaves is preliminarily dried and evaporated. During the process, the moisture content of the tea leaves to be fried is detected in real time by a halogen moisture meter arranged on the detection belt.

[0029] The front end of the lifting belt is connected to the detection belt, and a material balancing roller for adjusting the material flow is arranged in the middle. Multiple material balancing rods are arranged around the material balancing roller and the height is adjustable. After the material balancing roller is moved to the target point, the material balancing roller is driven to rotate by the motor, so that the tea leaves to be fried that are accumulated on the lifting belt or above the target material level will slide down. After balancing, the tea leaves to be fried whose flow rate meets the requirements are lifted to the rear end of the lifting belt.

[0030] The rear end of the lifting belt is its highest point, which is set just above the feeding port of the killing barrel. A receiving pipe is set at the bottom of the lifting belt. The tea leaves to be fried fall into the receiving pipe through the rear end of the lifting belt, and then enter the killing barrel through the feeding port of the killing barrel connected to the receiving pipe. The killing barrel is set as a three-section structure, with the highest temperature in the feeding section, the second highest temperature in the middle section, and the lowest temperature in the discharge section. By setting three different temperatures, the killing process and effect can be effectively controlled, and the tea leaves can be prevented from being fried at high temperatures for a long time and becoming burnt. The high temperature in the entrance section helps to quickly kill the enzyme activity in the tea leaves, and achieve the killing of the tea leaves in the shortest time, avoiding further action of the enzyme. At the lower temperature in the middle section, the killing speed of the tea leaves can continue to be controlled, so that the tea leaves can obtain better aroma and retain more nutrients. At the low temperature in the last section, the residence time of the tea leaves in the killing process can be further extended, so that the tea leaves are heated evenly and the quality of the tea leaves is improved.

[0031] The withering barrel is equipped with a photoelectric sensor for detecting the position of the material and a temperature sensor for detecting the temperature of each section. A total of three photoelectric sensors and three temperature sensors are provided, and the three photoelectric sensors are respectively installed on the top of the feeding section, middle section and discharging section of the withering barrel. During the rotation of the withering barrel, under the action of the spirally arranged guide plate inside the withering barrel, the tea leaves to be fried move from the feeding section to the discharging section until they reach the discharging section and are output from the withering barrel based on the discharging port. When the tea leaves to be fried enter the corresponding section, the signal is output to the controller, and the temperature sensors are correspondingly installed in the feeding section, middle section and discharging section to detect the real-time temperature of the three sections respectively and output the signal to the controller.

[0032] The controller is connected with the detection belt, halogen moisture meter, lifting belt, material distribution roller, withering barrel, photoelectric sensor and temperature sensor, receives the output signals of the halogen moisture meter, photoelectric sensor and temperature sensor, controls the opening of the detection belt, lifting belt, material distribution roller and withering barrel and makes corresponding control adjustments.

[0033] like Figure 1 The tea withering system control method shown includes:

[0034] S1. Obtain the humidity data of the tea leaves to be fried by the halogen moisture meter on the detection belt. When the humidity data drops to the target humidity, control the opening of the withering barrel;

[0035] S2. When it is detected that the internal temperature of the withering barrel reaches the target temperature, the detection belt is controlled to move to transfer the tea leaves to be fried to the lifting belt.

[0036] Following the principle of high-temperature killing, high first and low later, the target temperature of the killing barrel is 300℃ for the first feeding section, 280℃ for the middle section of the second section, and 240℃ for the third discharging section.

[0037] S3. Control the material distribution roller and the lifting belt to run at the target control parameters, and control the withering barrel to rotate at the target speed. The target control parameters make the tea leaves to be fried be added to the feeding port of the withering barrel at the first discharging speed. The target speed of the withering barrel is 2-3 seconds / revolution, and the first discharging speed is 400kg / h.

[0038] Controlling the material distribution roller and lifting belt to operate at target control parameters includes:

[0039] S301, controlling the material distribution roller to rise to the first material position;

[0040] S302, controlling the lifting belt to run at a first transport speed;

[0041] S303, adding the tea leaves to be fried to the feeding port of the withering barrel at a first discharging speed.

[0042] S4, when the second-stage material arrival signal sent by the photoelectric sensor is detected, the height of the material distribution roller and the speed of the lifting belt are reduced, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the second discharging speed;

[0043] Lowering the height of the leveling roller and increasing the belt speed include:

[0044] S401, controlling the material distribution roller to descend to the second material position;

[0045] S402, controlling the speed of the lifting belt to slow down so that the lifting belt runs at a second transport speed;

[0046] S403, adding the tea leaves to be fried into the feeding port of the withering barrel at a second discharging speed, the second discharging speed being 300 kg / h.

[0047] S5. When the three-stage material arrival signal sent by the photoelectric sensor is detected, the tea grade of the tea leaves to be fried is determined, the target discharge speed of the tea leaves to be fried is determined according to the tea grade, and the material distribution roller and the lifting belt are controlled to operate with the control parameters corresponding to the target discharge speed.

[0048] The tea grades to be fried are divided into first-grade tea and second-grade tea. First-grade tea includes single bud and one bud and one leaf, and second-grade tea includes one bud and two leaves and one bud and three leaves or more. First-grade tea and second-grade tea have different tenderness, which is an important indicator to describe the maturity of tea. Tea bud is the tenderest part and contains the highest quality potential. Single bud refers to picking only the tender bud of the tea tree, while one bud and one leaf includes one tender bud and one tender leaf. One bud and one leaf are slightly mature, while one bud and two leaves or more are more mature. The water-soluble components in the tender leaves, especially tea polyphenols, have a significant effect on the color, aroma and taste of the tea. Different frying times are used for teas of different tenderness, following the principle of killing old leaves tenderly and killing young leaves old.

[0049] Determine the target discharge speed of the tea leaves to be fried according to the tea grade, and control the distribution roller and the lifting belt to operate at the control parameters corresponding to the target discharge speed, including:

[0050] S501, when the tea grade is first-grade tea, control the material distribution roller to move to the third material position, and control the lifting belt to run at the third transport speed, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the third discharging speed, and the third discharging speed is 180 kg / h;

[0051] S502, when the tea grade is grade II tea, control the material distribution roller to move to the fourth material position, and control the lifting belt to run at the fourth transport speed, so that the tea leaves to be fried can be fed to the feeding port of the withering barrel at the fourth discharging speed, and the fourth discharging speed is 220kg / h.

[0052] The first discharging speed is 400kg / h, the second discharging speed is 300kg / h, the third discharging speed is 180kg / h or the fourth discharging speed is 220kg / h. During the processing, as the position of the tea leaves to be fried in the withering barrel is adjusted to reduce the discharging speed, the amount of tea leaves fed into the withering barrel is gradually reduced. As the tea leaves enter the middle and final stages, the amount of tea leaves fed is gradually reduced, thereby achieving the purpose of controlling the contact time between the tea leaves and the heat source and the running speed of the tea leaves. The moderate feeding speed of the tea leaves in the middle stage can not only ensure the withering effect, but also enable the tea leaves to fully receive uniform temperature, thereby achieving full withering of the tea leaves. The slowing down of the feeding speed of the tea leaves in the discharging section can allow the tea leaves to better absorb the temperature, so that the last part of the tea leaves can be fully withered, thereby improving the quality of the tea leaves.

[0053] In accordance with the principle of tender killing of old leaves and old killing of young leaves, the third discharging speed is 180kg / h and the fourth discharging speed is 220kg / h. The large discharging speed makes the collision and friction between the tea leaves more frequent and tighter during the rotation of the tea leaves in the withering barrel when the feeding amount is large. This will increase the relative movement speed between the tea leaves, and the lateral transportation speed will also increase accordingly. The small discharging speed makes the tea leaves in the withering barrel relatively sparse when the feeding amount is small, and there are fewer collisions and frictions between the tea leaves. The relative movement speed is slow, and the lateral transportation speed will also slow down. Under the same rotation speed and the same transportation distance, the transportation time required is usually longer when the feeding amount is small. The second-level tea leaves with lower tenderness are input into the withering barrel at the fourth discharging speed of 220kg / h, so that they can be output from the withering barrel faster, and the old leaves can be tenderly killed; the first-level tea leaves with higher tenderness are input into the withering barrel at the third discharging speed of 180kg / h, and the frying time in the withering barrel is extended to achieve the tender leaves.

[0054] In actual operation, adjustments and optimizations need to be made according to specific circumstances to ensure that the tea can achieve the ideal withering effect.

[0055] Finally, it should be noted that, in this article, relationships such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms include, include or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0057] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A control method for a tea leaf withering system, characterized in that: Applied to a tea-tea-withering system, the tea-tea-withering system comprises a detection belt, a lifting belt, a withering barrel and a controller connected in sequence, the detection belt is used for preliminarily drying tea leaves to be fried and detecting the humidity of tea leaves, the lifting belt is provided with a material-leveling roller for adjusting the material flow, the withering barrel is provided with a photoelectric sensor for detecting the material position and a temperature sensor for detecting the temperature of each section, and the control method comprises: Acquire the humidity data of the tea leaves to be fried from the halogen moisture meter on the detection belt, and when the humidity data drops to the target humidity, control the withering barrel to open; When it is detected that the internal temperature of the tea-withering barrel reaches the target temperature, the detection belt is controlled to move so as to transfer the tea leaves to be fried to the lifting belt; Controlling the material distribution roller and the lifting belt to operate at target control parameters, and controlling the green tea withering barrel to rotate at a target speed, wherein the target control parameters enable the tea leaves to be fried to be fed to the feeding port of the green tea withering barrel at a first discharging speed; When the second-stage material arrival signal sent by the photoelectric sensor is detected, the height of the material distribution roller and the speed of the lifting belt are reduced, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at the second discharging speed; When the three-stage material arrival signal sent by the photoelectric sensor is detected, the tea grade of the tea leaves to be fried is determined, the target discharge speed of the fried tea leaves is determined according to the tea grade, and the material distribution roller and the lifting belt are controlled to operate with the control parameters corresponding to the target discharge speed.

2. The control method according to claim 1, characterized in that: The target rotation speed of the killing barrel is 2-3 seconds / revolution.

3. The control method according to claim 1, characterized in that: The first discharging speed is 400 kg / h.

4. The control method according to claim 1, characterized in that: The controlling the material leveling roller and the lifting belt to operate with target control parameters comprises: The material distribution roller is controlled to be lifted to a first material position, and the lifting belt is controlled to run at a first transport speed, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at a first discharging speed.

5. The control method according to claim 1, characterized in that: The step of reducing the height of the material distribution roller and the speed of the lifting belt comprises: The material distribution roller is controlled to descend to the second material position, and the lifting belt is controlled to slow down, so that the lifting belt runs at a second transport speed, so that the tea leaves to be fried are fed to the feeding port of the withering barrel at a second discharging speed, and the second discharging speed is 300kg / h.

6. The control method according to claim 1, characterized in that: The tea leaves to be fried are divided into first-grade tea leaves and second-grade tea leaves. The first-grade tea leaves include single buds and one bud and one leaf, and the second-grade tea leaves include one bud and two leaves and one bud and three leaves or more.

7. The control method according to claim 6, characterized in that: The step of determining the target discharging speed of the tea leaves according to the tea grade, and controlling the material distribution roller and the lifting belt to operate at the control parameters corresponding to the target discharging speed includes: When the tea is graded as first-grade tea, the material distribution roller is controlled to move to the third material position, and the lifting belt is controlled to run at a third transport speed, so that the tea to be fried is fed to the feeding port of the withering barrel at a third discharging speed, and the third discharging speed is 180 kg / h; And, when the grade of the tea is second-grade tea, the material distribution roller is controlled to move to the fourth material position, and the lifting belt is controlled to run at the fourth transport speed, so that the tea leaves to be fried can be fed to the feeding port of the withering barrel at the fourth discharging speed, and the fourth discharging speed is 220kg / h.

8. The control method according to claim 1, characterized in that: The control method according to claim 1 is characterized in that the target temperature of the killing barrel is 300°C for the first stage, 280°C for the second stage, and 240°C for the third stage.

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