JPS63260A - Tea-making process and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable ideal rolling and drying of tea leaves, by calculating a curve of water-content vs. time during the processing period from determined value of water-content of tea leaves, predetermined water-content of processed tea leaves and predetermined processing time and controlling the feeding rate of heating medium for tea leaves. CONSTITUTION:In a coarse rolling, medium rolling and fine rolling of tea leaves, the water-content and quantity of tea leaves charged to a rolling and drying chamber 2 are determined by a sensor S7. The target water-content of processed tea leaves and the processing time are inputted from an indication board 37. A curve of the water-content vs. time in the processing period is calculated from the determined value and the preset value by a microcomputer 30. The quantity and temperature of hot air supplied to a rolling drum 2 is controlled in a manner that the value determined by a property-determination sensor S8 coincides with the curve in the course of processing.

Description

Detailed Description of the Invention (Objective of the Invention) <Industrial Application Field> The present invention relates to a tea manufacturing method and apparatus, and particularly relates to a tea manufacturing process that substantially involves a drying action, that is, a rough rolling process, a medium rolling process, and a tea manufacturing process that involves a substantial drying action. It can be applied to processing methods and equipment in processes, fine rolling processes, etc.

<Background of the Invention> In the processing of tea leaves, the steamed tea leaves are repeatedly rolled and dried from the rough rolling process to the fine rolling process, and are further dried and finished to produce a 6"-'A product. In this way In the tea manufacturing process, the rolling and drying of tea leaves are carried out in an integrated manner, and the equipment used during this process, including the rough rolling machine, essentially performs the drying function.

For this reason, in the tea manufacturing process, various factors such as spindle rotation speed, hot air temperature, hot air volume, etc. are controlled in order to obtain the desired drying state. Recently, several attempts have been made to automatically control this without relying on the skill of the operator. That is, many people including the present inventor have made inventions for predetermining a target moisture content and controlling tea manufacturing elements so that the actual moisture content changes in line with this.
At that time, no particular consideration was given to how to determine the target moisture content itself. This is because the tea leaves are harvested,
In addition, this seems to be due to the acceptance of the fact that the properties of tea can vary greatly depending on the fertilizer management of the tea plantation, as well as the amount of treatment in the previous process. Therefore, the target moisture content itself is a table based on the greatest common divisor that statistically processes the empirical values of the ordinance, and it is difficult to understand it mathematically. In addition, because the capacity of the rolling and drying chamber changes depending on the tea manufacturing equipment, it is necessary to create a target moisture content transition curve (table) through statistical processing each time.
At this point, the digitization of the tea manufacturing process was at a standstill.

By the way, the present inventor has discovered that this target moisture content transition curve is uniquely determined by a certain constant coefficient, and that the coefficient can always be measured regardless of sensitive factors that are difficult to grasp numerically, such as the variety of tea leaves and the time of picking. We focused on the fact that if it were determined by elements, it would be possible to facilitate the quantification of the tea manufacturing process. Based on this perspective, once the target water content transition curve is uniquely determined, the necessary tea manufacturing conditions, such as rotation speed, hot air temperature, hot air volume, etc., can be determined by taking into account various efficiencies and rates.

For example, 1 is corrected by water vapor partial pressure of the air used; 3 is corrected by rotational speed, 4 is corrected by capacity, ks is corrected by processing process; if other influences are corrected, the total efficiency is kl Xk2 Xk3 xk4Xk
3, it becomes possible to quantify the data by analyzing the data for each factor. Of course, initially due to other influences?
It cannot be denied that many of the f-correct ks are not necessarily clear.

However, until now, the targets varied widely, and the targets themselves had already taken into account 1...ks in various corrections, so there was no distinction between factors that had already been taken into account and factors that had not been taken into account, and it was difficult to quantify them. I was at a standstill.

Technical matters that were attempted to be developed> The present invention considers the rolling process to be a simple drying process, obtains a target moisture content transition curve, and uses this to obtain the necessary tea manufacturing conditions. Based on the basic premise that the tea manufacturing process can be quantified by multiplying various efficiencies, the idea was based on how to determine the target moisture content transition curve.

In determining the target moisture content transition curve, the idea was further developed based on the fact that the moisture content decreasing curve would depend on the moisture content at the time. After confirming that it is similar,
This is an attempt to complete the concept as a technical concept. This technical concept can be applied to processes that substantially involve drying, such as coarse rolling, medium rolling, and fine rolling.

(Structure of the Invention) Means for Achieving the Object> In other words, the tea manufacturing method of the present invention is a tea leaf processing method that substantially involves a drying action, and uses a microcomputer with a so-called CPU at its core, to improve the individuality of the rolling drying process actually performed. Values include input moisture content of tea leaves, target extraction moisture content, and set process time, except for those that are automatically loaded as default values, or values that can be automatically loaded as measured values or manually input to the instruction board. By loading these three values, the target moisture content transition curve, which is the control target curve for the rolling drying process that is currently being performed, is set as a part, and the moisture content of the tea leaves during the rolling drying process that is currently being performed is determined by this curve. This system is characterized in that the tea making elements are adjusted mainly based on the output of the drying medium supplying means so that the output changes almost approximating to .

In addition, the tea making device of the present invention uses a microcomputer with a so-called CPU at its core as an arithmetic and control section.
In an apparatus that essentially tumbles and dries tea leaves, the tea making elements are controlled mainly by the output of the drying medium supply means so that the moisture content transitions approximately close to the target moisture content transition curve. a means for measuring the moisture content of tea leaves, a means for setting the target moisture content of tea leaves at the time of extraction and a process time, reading and calculating the input moisture content of tea leaves, the target moisture content of tea leaves, and the set process time, and calculating the target moisture content transition curve. It is characterized by having a function that requires the following, and thereby aims to achieve the above-mentioned purpose.

<Example> The present invention will be specifically explained below based on the illustrated example. As already stated, the present invention can be applied to various tea manufacturing apparatuses that have a substantial drying effect, and specifically, It can be applied to rolling machines, medium rolling machines, fine rolling machines, etc. In the embodiments described below, a rough milling machine among these will be used as an example to specifically explain the method. First, a specific embodiment of the device of the present invention will be described, and its operating state will be explained along with a control flowchart. The present invention will now be described in detail.

FIG. 1 shows an embodiment of the present invention,
This figure shows the rough kneading machine 1 in a skeletal manner, and also shows the related control device mainly composed of a microcomputer. First, coarse kneading machine 1. Since the conventionally known ones are commonly used, detailed illustrations are omitted and only a skeletal illustration is provided.

Reference numeral 2 in the rough rolling machine 1 is a rolling barrel, which is hollow and forms a rolling and drying chamber 2' in which the tea leaves are processed. It is constructed by arranging breathable bamboo ducts and the like. In the kneading and drying chamber 2' formed by the kneading drum 2, a main shaft 3 is disposed approximately at the center in the longitudinal direction.
A rubbing hand 4 and a stripping hand 5 are attached to the. The rotation of the main shaft motor N1 is transmitted to the main shaft 3 by a chain 6, and the kneading hands 4 and the stripping hands 5 are rotated within the kneading and drying room 2'. Such a drying room 2
Air, which is a drying medium, is introduced into the drying chamber 2', and tea leaves, which are the processed material, are introduced into the drying chamber 2'. An exhaust port 10 is provided above the drying chamber 2'. Furthermore, a tea leaf inlet 1) is provided above this, and a take-out M12 is provided below the side of the rolling barrel 2 so as to be openable and closable so as to open a part of the surface of the rolling chamber. Next, drying medium supply means 1 to this drying chamber 2'
Regarding No. 5, this is defined as including all the devices involved in supplying heated air (hot air), which is a drying medium, until it is discharged. The main device of this drying medium supply means 15 is a so-called heater. First, a hot air blowing fan 16 for feeding outside air is provided on the starting side, and a heating chamber 17 is formed on the blowing side. A burner is installed in this heating chamber 17. A heat exchanger 19 heated by the heat exchanger 18 is circulated in a zigzag pattern, and between the heat exchangers 19 and 18, outside air at normal temperature, which is returned from the treatment blower fan 16, is heated and turned into hot air, which is then sent into the hot temperature introduction duct 9.

Various dampers are installed along the supply path of such hot air or the initially normal temperature air that is sucked.
Reference numeral 2) is an intake air adjustment damper provided at the outlet α of the hot air blowing fan 16, 22 is a hot air adjustment damper provided in the hot air supply duct, and 23 is provided above the exhaust port 10.

It is an exhaust damper. Next, the part involved in inputting the tea leaves, which is the workpiece (in terms of details, reference numeral 25 is a weighing box, which is supported by a spring 26 on the machine frame of the appropriate coarse rolling machine 1, and is attached to the bottom of the box. The bottom: 27 is provided so that it can be opened and closed freely.The basic principle of this weighing box 25 is that when a predetermined amount of tea leaves is put in, the spring 26 is compressed by the weight of the tea leaves, and the weighing box 2
After detecting that the position of 5 has been lowered and measuring a predetermined amount, the bottom cover 27 is opened and the tea leaves are introduced into the drying chamber 2' through the tea leaf inlet 1). Furthermore, at the bottom of this tea leaf inlet 1), an opening/closing plate 2 is provided in the shape of a double door. Further, in such a device, the following sensor is provided according to the present invention. First, an intake air dry bulb temperature sensor SL, an intake air wet bulb temperature sensor S2, and an intake air velocity sensor S3 are installed in the outside air introduction part, and the amount of air introduced and its properties are measured here. A hot air temperature sensor S4 is installed near the hot air introduction duct 9, and an exhaust port 10 from which hot air is discharged is provided.
An exhaust dry bulb temperature sensor Ss and an exhaust wet bulb temperature sensor S6 are provided nearby. Further, an input amount detection sensor S) is provided near the measuring box 25, and a sensor S6 for measuring the properties of the sampled tea leaves is separately attached to this apparatus.

In such a rough rolling machine, hot air is supplied into the rolling and drying chamber 2' as the tea leaves are introduced in accordance with the usual method, and by driving the main shaft 3, the tea leaves are rolled and stirred by the rolling hands 4 and the sifting hands 5, and the tea leaves are rubbed. and drying. This basic operation itself is performed in the same manner as in the conventional method. However, in the present invention, by adding a control means as described below, control is automatically performed to obtain the most preferable final product. First of all, regarding this control system, reference numeral 30 is a microcomputer which is one of the main components of the control system.・It is equipped with a writable RAM and an I/○ port for transmitting and receiving input/output signals. This configuration is a configuration of the so-called microcomputer itself, and further explanation will be omitted. Each of the microcomputers 30 is provided with an interface for driving an actual mechanism or for obtaining information from various sensor groups. First, reference numeral 31 is an output interface. I10
The actuator group 32 is driven by receiving the output from the port. This actuator group 32 can be appropriately driven according to the operation of the members to be controlled, and appropriately drives the stamping motor and other torque actuators. Further, reference numeral 35 is an input interface,
The output of this human interface 35 is input to the microcomputer 30. Sensing signals from the sensor group 36 are supplied to the input interface 35 as information. That is, specifically, it is data from various sensors S1 to S8.

Furthermore, information from an instruction hoard 37 is input to this input interface 35. Specifically, data such as the amount of tea leaves to be input, the input moisture content, the target moisture content, and the process time are input to this instruction board 37 by manual operation by the operator.

This apparatus has the configuration described above, and performs processing as follows. The following explanation is based on the flowchart showing the control program shown in Fig. 3 and the target water content transition curve which is an example of the control (shown in Fig. 2 and Table 1 showing specific data thereof, etc.). The explanation will be given by taking the example of data that is available in the Internet, but prior to that explanation, some of each term will be explained. First, the steps in the flowchart of the program are defined as control steps, and the series of processing times from inputting tea leaves to removal during actual processing is defined as a period. time) is called the Kani step. In addition, in flowcharts, etc., all the steps are N and each step is n.

i) Setting the target control curve First, when starting the operation, initialize the microcomputer 30 according to the usual method, and then start the control step 1.
In step 01, input moisture content, target extraction moisture content, and set process time are input.

For example, in the rough rolling process, in the example shown in Table 1 and Figure 2, the input moisture content (%) = 360%, the target extraction moisture content (%)
) = 100%, set process time - 40 minutes. Such input is performed by manually operating the instruction board 37 in the above-mentioned mask.

Next, in a control step 102, air properties, input amount,
This is for inputting the target tea temperature. Regarding the air properties, since the drying medium supply means 15 has already started operation, the intake air dry bulb temperature sensor Si, the intake air wet bulb temperature sensor S2, the intake air speed sensor s3, and the hot air temperature sensor S
4. Exhaust dry bulb temperature sensor SS, exhaust wet bulb temperature sensor S6
Detection signals from etc. are input to the input interface 35.

Of course, it is not necessary to input all of these data, and in the control example shown in Table 1 and Figure 2, the temperature data of the wet and dry bulb temperature needle at the intake position (for example, 25
℃, 2) ℃) is input. Further, in this control example, the input amount is set to 120 kg, and the target tea temperature is set to 36°C. After such input, control step 103
In , the transition state of the target hot air temperature is input. This is done by determining the ratio of each step based on experimental data, determining the reference value from the temperature data of the psychrometric thermometer, target tea temperature, etc., and automatically determining the value by multiplying this by each ratio, and the instruction board 37. In this method, the values for each step are manually set.

For example, according to the second step in Table 1, for example, 98 ° C to 98
The temperature is set to gradually decrease to 91°C.

Temperature spindle rotation change state (from Table 1) Next, in control step 104, it is determined whether or not the process can be started, and if the process can be started, that kake step is the first kake step. In other words, it is determined in the subsequent control step 105 whether or not it is the second step PL. In addition, if the process does not start, loop 20
1, the process is repeated to determine whether or not to start the process again.

In this way, the efficiency constant K in the first step is
is read out in the subsequent control step 106. Here, the efficiency constant K will be explained. Since the target and actual values may approximate or differ depending on how the efficiency constant is selected, the designer should pay attention to this. The following factors were considered in the implementation (7+l) as influencing efficiency.

kl　; Suito partial pressure Relationship between dry bulb temperature and wet bulb temperature of the outside air It is determined by the person in charge whether the air is dry or not. The drying speed is different.

k2; Spindle rotation speed 6- How quickly can rubbing and spatula remove internal moisture? It depends on whether it leaks to the outside.

k3　;Capacity (how many kg type) O==Mechanical, such as the heat storage capacity of the equipment itself efficiency.

k4; Processing process details C = Leaf-like state or pinched state, etc. Impact of.

k5; Other colors O-Removed moisture/Kani step size Initial moisture content and correction factors (k 6).

Therefore = kl Xk2 xk3 xk4 xk5
It becomes Xk6.

Therefore, if the data for each factor is multiplied by M and analyzed, it will contribute to counting. Of course, not all of the factors listed in the examples may be present, and there may be overlapping factors that originate from the same cause. However, by accumulating and analyzing data, they should be sorted out. In other words, the present invention is unknown (
It also allows the equation to be organized by moving the (uncertain) factor (coefficient) to the - side or wrapping it in the - equation.

Ideal required air volume determined from K × Actual target transition ball volume - target moisture content (depends on hot air temperature, but is always determined to be one) The following values were used. Of course, this K is the sum of the multiplications of each factor, but its details are not the gist of the present invention, and were obtained as a result of data analysis of the factors that the applicant focused on, and this is not necessarily unique. do not have.

<Efficiency change state (from Table 1)> This efficiency constant K is different between each step P1 to P8 as shown in the table above, and if it is not the first time, the efficiency constant is changed as appropriate. It is input as a correction value from the loop 202 to the subsequent stage of the control step 106. Subsequently, in control step 108, a target water content transition curve is calculated, and values are assigned for each step. This calculation is performed in control step 101.
The calculation can be performed only by the values of input moisture content, target extraction moisture content, and set process time input in . Here, the basics of calculating the moisture content transition curve will be explained.

Assuming that the drying rate depends on the moisture content at that time, the water that dries during t; time y(t) i moisture content 1=>1 +Δt y(t) −1(E +Δ1)=αy(t )Δ[Divide both sides by Δt (y(t +Δt)−y(t)) /Δt=−αy(t
) If ΔL is 0, then dy/dt=-αy If both sides are divided by y, 1/y -dy, /dt=α Integrating this, 1)/y -dy=-αIdt In y + CL =-α・t Shifting C1, In y = -α・1-(1 y=e (-yt CI) = Ce (-yt) (where C= e -CI) Here, when t=Q, the initial water content is yo. By = c = y.

Also, if the removal time t=T and the removal water content is y1, then yt　Ya　　-e〈-αT) e(-αT)=y1/y.

- αT=pn-y1/ya α= IIn (yt/yl) ) ) /T Therefore, the water content is y = yo e((In Cy+ /yo) ) /
T) It can be expressed as t.

In the present invention, the previous equation is the target water content transition curve calculation formula based on the original assumption, but it is also conceivable to assume a calculation formula that is approximate to this formula simply to not use this calculation formula.

For example, ■ y = y, G e (In (
yt / yo) /T 8 1 t
B■y= ((yl -yo)/TB) t
B +yO■y=(yo yt) (1-sin
(πt/2T))+y1 *8; It is just a coefficient, etc., but in any case, its constant is input moisture content,
This is a formula that uses the extracted moisture content and the process time, and is defined only by these.

Table 1> In other words, the target moisture content (z) for each step is as shown in Table 1: Step Po: 360% d, b,
The following pt: 317 (same below as unit omitted), P
2:279, Pa:23B, P4:202
, Ps: 172, Ps
:147, P7 :12), P
It is determined as a:100. Setting such a target water content transition curve is one of the basic technical ideas of the present invention, but based on this, each tea manufacturing element, especially,
Various control values are calculated to control the drying medium supply means 15. In the control step 109, the target hot air temperature transition value input in the control step 103, the target moisture content transition curve calculated in the control step 108, which is a previous control step, and the control step 106
．． According to the value of the efficiency constant calculated in 107,
- It calculates the air volume transition target value in each step for each period. Specifically, the following calculation is performed to calculate the air volume transition target value. That is, the ideal required air volume is determined as follows.

Latent heat of vaporization (kca+2/kg) at tea temperature tc ('C)
)=L, then L=539.1 0,643 X(tc -100)-
〇,0OOf334X (t c 100 ) 2Specific capacity r is γ=1,291 where dry bulb temperature is t('C)
X273 /273 + t Also, the amount of water to be removed in each step ΔuJ (kg) is the input amount; W (kg) Input water content; An (d, b) Initial water content; At (d, b) Water combination rate: A2 (d, b), then Δur-WX (At-Az)/(Ao+10
0).

Also, process time; T hot air temperature; 1) 4 ideal required air volume; N1, then M = (LXΔ1.IJ) / (0,24X t M
xγxT).

So, for example, if we pay attention to the crab step P4, L = 53
9.1-0,643 X(36-100)-0,0O0
834X(36-100)2 =576.8γ=1,2
91 X273 /273 +25=1,183Δmouth・
120 X (238-202) / (360-!-
100) = 9.39M=576.8 X91391
0,24X95X1,183X5=40.2 (r
rr/m1n).

Similarly, the required air volume is calculated as follows: <Required air volume change state> *Unit: m/win By multiplying this by the efficiency constant, the target air volume is determined as shown in the table below.

<Target air volume change! 3 (from Table 1)> *Unit: rd/min In this way, specific control values for each tea manufacturing element were obtained, and the results are as shown in Table 1 above. After allocating data in this way, in control step 1) 0, the steps in each period are sequentially controlled from the first, and first, the steps within one step are set to a certain fixed time. The process is performed sequentially depending on whether or not the second step is completed. First, after confirming in control step 1) 0 that it is within the first step n, the air flow target in the previous step n is read out based on the calculation result of the air volume transition target value in control step 109. 0 For example, if the step n is the step P1, the air volume at that time is 1Orr?/min in Table 1, and that command is output.Then, the control step 1)2 In this step, it is checked whether the target calmness value and the current airflow rate match. Of course, at this time, if the current air volume and the target value do not match, the process goes through loop 203 and in control step 1) 4, a correction value corresponding to the error is output 7. After confirming that the current air volume and the target air volume match in this way, the process progress is determined in control step 1) 3.The process time of step n, e.g. In the case of crab step pt, it is 4 minutes, but it is determined whether or not it has exceeded 4 minutes, and if it has exceeded, the extraction time, that is, whether or not the crab step of - period has been consumed or not is further controlled. This is determined in step 1)4. In this control step 1) 4, it is determined whether or not step n has reached step N. If it has not yet reached step N for one period, the control step is executed to proceed to the next step. - Replace the kani step with n+1 in knob 1) 5, input again control step 1) 1 from loop 206, and repeat the process already described. In addition, control step 1) 3 for determining the process progress level
If the time stipulated in the kani step n has not yet been exceeded, supplementary corrections such as tea temperature correction or moisture content correction are performed, which will be described later. Describing a specific example of controlling the drying medium supply means 15 in a control example using such control steps, first, when adjusting the hot air temperature, the air volume and the burner 18 are controlled.
The number of revolutions of the hot air blower fan 16 is increased or decreased by controlling the voltage applied to the drive motor itself, or by shifting a continuously variable transmission interposed in the middle. Change it. Furthermore, apart from such means or together with these means, an intake air adjustment damper 2 is provided.
) may be controlled by switching the
In this case, the intake adjustment damper 2) is set to the fully open position, for example.
When @ ground is set, the fully open position or up to the specified position W is 1.
It is divided into several stages from address to address n, and shifted by a motor or the like to obtain the rotation angle accordingly. In addition, when controlling the output of the heat exchanger 19 itself, for example, when a plurality of burners 18 are provided, the operation of one or some of them is stopped and the output of the burners 18 is switched. Of course, if only one burner 18 is provided, the fuel injection amount is adjusted by adjusting the nozzle, etc.
Adjust the amount of flame of 8 itself. Furthermore, the adjustment can be made by closing the exhaust side. For example, the exhaust adjustment damper 23 may be controlled in the same way as the intake adjustment damper 2) to switch its open/closed state. In order to control the time of direct contact with the drying medium, etc., the rotation of the main shaft 3 may be controlled, and the stirring state may be changed using the wiper 5. In order to switch the rotation speed of the main shaft 3, specifically, the voltage applied to the main shaft motor M is controlled to increase or decrease the rotation speed, and a continuously variable transmission or the like is interposed in the middle to control this. The rotation of the main shaft 3 may be controlled by this. By following the steps described above, almost the final extraction conditions can be obtained and tea leaves can be dried with properties close to ideal.

ii) Feedback control Control step 1) for determining the degree of process progress mentioned above
In step 3, if the required time for each step has not yet been reached, in subroutine 205, corrections are made based on the state of tea temperature and water content.

That is, in the control step 120, it is determined whether or not there is a need for sequential feedback correction, and if it is necessary, it is further determined in the first addition step whether or not the time interval in which correction can be applied has elapsed, that is, when the check time has passed. It is determined in control step 12) whether or not the If both of these are negative, an output is sent to the loop 1206, and the control in control step 1) 1 described above is repeated.

If the affirmative signal from control step 12) is within the check time, it is determined in control step 122 that one or both of tea temperature and water content should be controlled. First, when determining the tea temperature, in control step 123, the current tea temperature is input from the sensor and read. Thereafter control step 124
, it is determined whether or not the target tea temperature, for example, 36°C, matches the current tea temperature, and if they match, the routine 1206
The control steps described above are repeated. If the tea temperature does not match the target tea temperature, a correction output is outputted in control step 125, and a comparison and determination are performed again in control step 124 for determination through loop 207. For example, every time the tea temperature shifts by 0.2°C, the hot air temperature is increased or decreased by 2°C. Of course, the output of the control step 125, which instructs the correction output, may be directly input to the loop 206 side.

- On the other hand, in the case of feedback control based on the tea leaf moisture content, the current moisture content is input in control step 126. Specifically, this moisture content information is obtained by measuring appropriately sampled tea leaves using a high frequency capacitance type moisture meter or the like, and inputting the value. After the current moisture content is input in this way, the target moisture content is read out from the target moisture content transition curve of the crab step at the time of measurement, and this is calculated based on the calculation in the control step 109 to determine how much the crab step is. This is to input whether it is a second step at the beginning of a stage and read out the value at the second step. Similarly, in control step 128, the air flow rate transition target value in the second step at that time is inputted based on the calculation in control step 109.

After making such an input, it is determined in control step 129z whether the current moisture content and the target moisture content match, and if they match, the output is input to loop 206 and control step 1) 1 is performed again. This means that the control from

Of course, if there is a mismatch between the current moisture content and the target moisture content in the control step 129, a correction output is output in the control step 130 to control the moisture content to approach the target moisture content.

Such a correction itself also includes the control of the burner 18 in hardware as already mentioned, the hot air blower fan 16
It controls the rotational speed of the engine, and also controls the intake air adjustment damper 2).

1: i) Determination of continuation of control In this way, after determining whether or not extraction is to be performed in control step 1) 4, if the extraction state is reached, that is, the situation in which all the predetermined addition steps have been completed. If so, it is determined in control step 1) 6 whether or not to continue processing in the next period in which new tea leaves are processed in the same machine. That is, if there is no need to continue the next period, an appropriate alarm or the like is activated in control step 1) 7, and the - series of tea making processes is ended. - On the other hand, after the processing of the period is completed, if the processing of the second period in which new tea leaves are processed or the processing of the subsequent period is continued, the moisture content of the tea leaves actually taken out in control step 1) 8 is J1). Next, in control step 1)9, the change coefficient β is determined by comparing the value of the next target number of combined water content with the actual extracted water content in control step 1)8.

That is, when repeating the next period, the actual extracted moisture content after extraction is measured and input, compared with the target moisture content to determine the change coefficient β,
The efficiency factor is changed from 6 to β・k6, and in subsequent periods, the βs are multiplied together and the value changes to 6. In the n period, β1, β2, and βn− change from 6 to 6. .

For example, in the second period, the first period withdrawal is 90% (d
-b), then β・k a = (360-90) / (360-1
00) Rini 6 = 1.038ka.

Therefore, the target air volume needs to be 1/1.038 times the amount mentioned above.

Furthermore, if the line is configured with two rough rolling machines and one rolling machine, it is also possible to make this change as follows.

β'6=(βa+kg)÷2=(((360-90) k6/(360
-100))+ksl) ÷ 2 This is a formula that always averages the previous value.

After setting the new efficiency constant in this way, loop 2 again
04, the output from control step 1) 9 is input to the previous stage of the initial control step 101, and the control of the dose line is repeated.

(Effects of the Invention) As described above, the present invention makes it possible to obtain constant, nearly ideal control data just by inputting the input moisture content of tea leaves, the target extraction moisture content, and the set process time. If the tea leaves are processed in accordance with this, almost ideal processing of tea leaves can be achieved.

[Brief explanation of drawings]

Fig. 1 is a skeletal configuration diagram showing one embodiment of the present invention, Fig. 2 is a water-containing industry transition target curve according to the control method of the present invention, and Fig. 3
The figure is a flowchart showing processing steps for carrying out the invention. 1; rough rolling machine 2; rolling barrel 3; main shaft 4; rolling hand 5; sieving hand 6; chain 9; hot air introduction duct 10; Delivery fan 17; heating chamber 18; burner 19; heat exchanger 2); intake adjustment damper 22; heat adjustment damper 23; exhaust adjustment damper 25; measuring box 26; spring 27; bottom cover 28; opening/closing plate 30; Computer 1'' user 31; Output interface 32: Actuator group 35; Input interface 36; Sensor group 37; Instruction board M; Main shaft motor SL, intake air dry bulb temperature sensor S2; intake air wet bulb temperature sensor S3i intake air speed sensor S4i hot air temperature Sensor SS, exhaust dry bulb temperature sensor S6; exhaust wet bulb temperature sensor s7, input amount detection sensor SS; tea leaf property measurement sensor

Claims (2)

[Claims] (1) In a tea leaf processing method that essentially involves a drying effect, a microcomputer with a so-called CPU as the core is used to determine the input moisture content of tea leaves, target extraction moisture content, and setting process as individual values of the rolling drying process. Except for time, which is automatically read as a default value, it can be read automatically as a measured value, or manually input to the instruction board, and these three values can be read in for the actual massage. A target moisture content transition curve, which is the control target curve for the drying process, is uniquely determined, and the output of the drying medium supplying means is mainly controlled so that the moisture content of tea leaves during the currently rolling drying process changes approximately to this curve. A tea manufacturing method characterized by adjusting tea manufacturing elements set as follows. (2) A microcomputer with a so-called CPU at its core is applied as the arithmetic/control unit, and the tea manufacturing elements, which are set mainly based on the output of the drying medium supply means, are controlled so that the transition approximates the target moisture content transition curve. , an apparatus for essentially rolling and drying tea leaves, at least a means for measuring the moisture content of tea leaves at the time of inputting, a means for setting the target moisture content of the tea leaves and the process time at the time of taking out, and a means for setting the input moisture content of the tea leaves and the target extraction. A tea making apparatus characterized by having a function of reading a moisture content and a set process time and calculating the target moisture content transition curve.