JPH01206952A - Tea-steaming process and apparatus therefor - Google Patents

Abstract

PURPOSE:To facilitate the automatic control of the steaming treatment of tea leaves, by temporarily increasing or decreasing the feeding rate of tea leaves to a steaming drum and measuring the time elapsed before the detection of the increase or decrease of the delivery rate of the processed tea leaves from the steaming drum. CONSTITUTION:Tea leaves are continuously supplied to a charging port of a steaming drum 30 with transfer means 11-22, steamed in the steaming drum 3 and delivered from a delivery port 32 to the next stage by a transfer means 40. The steaming time is controlled by the inclination angle of the steaming drum 3. In a tea-making steaming machine having the above structure, the feeding rate of tea leaves to the steaming drum 30 is temporarily increased or decreased, the time elapsed before the detection of the temporary increase or decrease of the delivery rate by the delivery rate sensor 43 placed at the downstream of the delivery port 32 is measured (and operated) and the inclination angle of the steaming drum 30 is adjusted to equalize the measured time to the target time.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a tea manufacturing and steaming method and its equipment, and more specifically, to a desired target value for the steaming time of tea leaves passing through a steamer barrel. In order to achieve this, the steaming time is automatically controlled.

(0) Conventional Technology In the tea manufacturing process, the steaming process is so important that it is said to determine the value of the product.

In addition, it has the purpose of generating a flavor unique to green tea and facilitating the rolling drying operation in the next step. Steaming time is an important factor in achieving these objectives. The steaming time refers to the time from when the green tea leaves are put into the steamer until they are taken out, and this is approximately proportional to the degree of steaming (the progress of steaming the tea leaves).

Therefore, by adjusting the steaming time, it is necessary to perform steaming according to the properties of the green tea leaves and the customer's preferences.

However, the steamer with rotating barrel measures the steaming time; l
It's difficult to say that.

Conventionally, as a solution to these problems, Japanese Patent Application Laid-Open No. 1986-
There are inventions such as No. 216643, JP-A-60-256347, and JP-A-60-251842. The weight of each steamer is measured, and the amount of tea leaves retained in the steamer is M[9].
], and on the other hand, the amount of raw tea leaves supplied to the steamer N[9/
S] and steaming time T = M / N [S]
is calculated.

(8) Problems to be Solved by the Invention However, this method tends to be inaccurate in measurement because it attempts to measure 9 to 9 tea leaves in a vibrating steamer of 9 to 100. Therefore, the present invention does not have the drawbacks of the conventional device, and the actual steam heat is 8 iv.
It is an object of the present invention to provide a tea manufacturing and steaming method which can accurately determine the temperature and which can be carried out simply and inexpensively, and its method y81.

(d) Means for Solving the Problems In order to achieve the above object, the present invention continuously supplies a predetermined amount of tea leaves from one side to the steamer barrel, and the tea leaves discharged from the other steamer barrel. In addition to constantly measuring the weight per unit time, when the supply and discharge of tea leaves from the steamer drum are under normal conditions, the weight per unit time is measured. 8) Temporarily change the corresponding part!
The actual steaming time T is calculated based on the time difference until the change on the 8 side becomes a change on the discharge side and is set in advance. Especially when calculating the actual steaming time mentioned above. First, temporarily increase or decrease the hourly supply of tea leaves mentioned above.

Measure the times t1 and t2 until the increase and decrease on the supply side appear as increases and decreases on the discharge side, respectively, calculate the actual steaming time T based on the two times t1 and t2, 2) Change the above hourly supply of tea leaves l by a constant time m, and apply! Measure the times t3 and t4 until the rise and fall of the change on the 8 side appear as the rise and fall of the discharge side, respectively, and calculate the times ff1t3 at these two times.
, 1%+lTV at actual steaming based on t41! Calculate 3
First, if the above-mentioned hourly supply amount of tea leaves is changed temporarily, this will appear as a change in the discharge side, but the point at which the change in the discharge side becomes the center from the change in the supply side (
The time t5 until this point is reached is measured, and the actual steaming time≠ is calculated by measuring the time t5.

This will be explained based on the drawings.

The fixed quantity supply means 10 has a measuring conveyor opening in which a belt conveyor 12 is mounted on a load cell 13, and an endless belt 21 equipped with a large number of supports, which is stretched upwardly and inclinedly. The weighing conveyor 1 weighs the tea leaves supplied from the fresh leaf chamber at a preset weight per unit, and then weighs the tea leaves at a certain weight. For example, the steamer drum 3 is injected into the hopper 23 of the leaf feeder 20 intermittently every hour.
If the desired tea leaf supply amount to 1 is Ml [9/h], then Mi=m+10K [9/h].

On the other hand, in the leaf feeder 20, the tea leaves of rn+ [to 9] which are intermittently fed from the weighing conveyor 11 are changed in time height l to exactly [hl. Therefore, the steam barrel 31 (koha,
Fresh tea leaves are continuously supplied to the tea mixing control panel 50 at a preset weight.

Steam I! Reference numeral 30 denotes a steaming barrel 31 mainly consisting of a fixed barrel and a rotating barrel (not shown in the drawings), and a steaming barrel 31 that passes through the steaming barrel 31.
It consists of a stirring shaft (drawing fL: not provided) for stirring the tea leaves inside, a means 80 for adjusting the inclination of the steamer barrel 31, a means for adjusting the tip of the rotary drum and the stirring shaft (not shown in the drawing). ), etc., are also provided.

The means 40 for measuring the discharge Mik of tea leaves is a belt conveyor 41 placed on an O-docel 42 .

Then, the tea leaves discharged from the steamer barrel 31 and stably supplied via the vibrating conveyor 43 are carried out to the tea making machine for the next process. ] is measured. When the effective capacity of the belt conveyor 41 is L [ml] and the belt speed is V [m/hl], the amount of tea leaves discharged per hour M [9/h] is calculated from the following equation.

M=J÷(V+L) Therefore, the control means 70 can always calculate the amount of li discharged per hour.

The control means 70 is generally a microcomputer or sequence controller equipped with arithmetic functions, and has the following functions.

For example, if the amount M1 of tea leaves supplied to the steamer barrel 31 is set to 300 [9
/h] and the desired steaming time I+Il! T' to 75[
S], the control means 70 is set to that effect.

Therefore, the quantitative supply means 10 supplies tea leaves to 300 [(1
/h] is started to be supplied to the melon trunk 31, and the corresponding amount of steam is also supplied to start cutting off the steam heat. After a while, straw-ripened tea leaves will be discharged from the discharge port 32 of the steamer barrel 31, and after a few minutes, a steady state will be reached in which the amount of tea leaves is approximately equal to the amount of discharge, and the tea leaves will be steamed at a constant rate. It is then excreted.

Next, the control means 70 controls the following (+), (2), (
The actual steaming time T is calculated as in 3). (1),
The nitridation is 1% at the time of steaming! 'Calculated based on the fact that it tends to appear with a time lag depending on the JT.

(1) Temporarily change the hourly supply amount M1 of tea leaves (for example, 1
After returning to the steady state for a few minutes, the constant amount ΔM is temporarily decreased again.

Then, the changes in +ΔM and =ΔM appear shifted by equal times t1 and t2 corresponding to the actual steaming time T, respectively, in the measuring means 40 on the discharge side.

Therefore, by taking the average of tl and t2, the actual steaming time T
shall be.

Even if the supply amount M1 is simply increased or decreased, the change that appears on the discharge side will be the actual steaming time T.
Compared to , they tend to appear shorter and longer, respectively. However, as described above, since both are averaged, a more accurate value can be calculated.

(2) Change the supply amount M1 of tea leaves per hour over a certain period of time (for example, 3 minutes) (for example, increase 9/h to ΔM=30).

Then, in the discharge side measuring means 40, the rise and fall of the change in the supply amount are calculated as approximately equal waiting times Tvi according to the actual steaming time.

Even if the supply 51M+ is changed by Hayabusa, the appearance of the change on the discharge side will be slightly different when it increases and when it decreases. However, as described above, since the time t3 until a rising change appears and the time t4 until a falling change appears, a more accurate value can be calculated.

(3) Temporarily change the hourly supply amount M1 of tea leaves (for example, 2
change by a certain amount ΔM during the interval).

Then, this change appears in the measuring means 40 on the discharge side as a change in time that is shifted by a time corresponding to the actual steaming time T, and in a period that is slightly different from the above-mentioned time (longer than usual). Therefore, the time difference t5 from the center of the change period on the supply side to the center of the change period on the discharge side is calculated as the actual steaming time T.

If there is a simple time difference in the change, the time difference is either shorter or longer than the actual steaming time T and is difficult to match. However, by detecting the time difference between the center of change and the cow, the steaming time Therefore, it is accurate.

Since a more accurate actual steaming time T is calculated as shown in (+), (2), and (3) above, the control means 70 measures and compares the set values t3 and t4 of the steaming time, and calculates the difference between them. to T
Accordingly, the control elements of the steamer barrel 31, for example, the inclination angle of the steamer barrel 31, are changed so that the two coincide. For example, if the actual value T is longer than the set value T°, the adjusting means 81 is instructed to make the inclination angle steeper.

(f) Effects of the invention Unlike conventional products, there is no error caused by tea leaves adhering to the inside of the steamer barrel or tea leaves being dropped from the steamer barrel. Rather than setting the time for the deviation of the temperature to 1'1llT during steaming, the time of opening Tre during steaming is
Because it is calculated, the measured value is extremely accurate. Therefore, it is possible to improve the quality of tea.

Furthermore, the device is simple and inexpensive, and maintenance and inspection are easy.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing the device according to the present invention, and FIG.
．． Figure 3.4 shows (1) and (1) in the (ne) action column, respectively.
It is a graph explaining cases 2) and (3). 10... Constant supply line means 31... Steaming cylinder 40... Undegradation means 70... Control means

Claims (1)

[Scope of Claims] (1) Continuously supplying a predetermined amount of tea leaves from one side to the steamer drum, constantly measuring the weight of tea leaves discharged from the other steamer drum per unit time, and tea leaves in the steamer drum. When the supply and discharge of tea leaves are in a steady state, the above hourly supply amount of tea leaves is temporarily increased or decreased, and the increase or decrease on the supply side appears as an increase or decrease on the discharge side, respectively. Measure the time t1 and t2 between the two
The actual steaming time T is calculated based on the two times t1 and t2, the preset steaming time T' is compared with the actual value T, and the control elements of the steaming barrel are changed so that the two coincide. (2) Continuously supply a predetermined amount of tea leaves to the steamer from one side, constantly measure the weight per unit time of the tea leaves discharged from the other, and When the supply and discharge are in a steady state, the amount of tea leaves supplied per hour is changed for a certain period of time until the rise and fall of the change on the supply side appear as the rise and fall of the discharge side, respectively. The times t3 and t4 are measured, and the two times t3 and t4 are measured.
A tea steaming method in which the actual steaming time T is calculated based on the above, the preset steaming time T' is compared with the actual value T, and the control elements of the steamer barrel are changed so that the two match. (3) Continuously supply a predetermined amount of tea leaves to the steamer drum from one side, constantly measure the weight of tea leaves discharged from the other steamer drum per unit time, and ensure that the supply and discharge of tea leaves from the steamer drum is constant. If the above-mentioned hourly supply amount of tea leaves is changed temporarily in the above state, this will appear as a change in the discharge side, but from the change in the supply side to the point where the change in the discharge side becomes the center. The actual steaming time T is calculated based on the time t5, and the preset steaming time T is calculated.
′ and the actual value T, and the control elements of the steamer barrel are changed so that the two coincide (4)
) a quantitative supply means capable of arbitrarily changing the amount of tea leaves supplied per hour to the steaming drum; a measuring means capable of measuring the weight of tea leaves discharged from the steaming drum per hour; a means for changing control elements of the steaming drum; It is determined that the supply and discharge of tea leaves from the steamer barrel is in a steady state, and the quantitative supply means temporarily increases or decreases the amount of tea leaves supplied to the steamer barrel per hour, and the measurement means increases or decreases the amount supplied per hour. Measure the times t1 and t2 until they appear as increases and decreases on the discharge side, respectively, and calculate the times t1 and t2.
a control means capable of calculating an actual steaming time T from a predetermined value, and controlling the changing means so that a preset steaming time T' and the actual value T are equal to each other; Device. (5) A quantitative supply means that can arbitrarily change the amount of tea leaves supplied per hour to the steamer drum, a measuring means that can measure the weight of tea leaves discharged from the steamer drum per hour, and a means for changing the control elements of the steamer drum. and determining that the supply and discharge of tea leaves in the steamer barrel are in a steady state, and changing the amount of tea leaves supplied per hour to the steamer barrel by the quantitative supply means for a certain period of time, and detecting the change in the supply side by the measuring means. The time t3 until the rise and fall of the output side appear as the rise and fall of the discharge side, respectively.
, t4, and calculates the actual steaming time T from the times t3 and t4, and compares the preset steaming time T' with the actual value T so that the two match. A tea steaming device comprising a control means capable of controlling. (6) A quantitative supply means that can arbitrarily change the amount of tea leaves supplied per hour to the steamer drum, a measuring means that can measure the weight of tea leaves discharged from the steamer drum per hour, and a means for changing the control elements of the steamer drum. It is determined that the supply and discharge of tea leaves from the steamer barrel is in a steady state, and the amount of tea leaves supplied per hour to the steamer barrel is temporarily changed by the quantitative supply means, and the amount of tea leaves supplied to the steamer barrel per hour is determined based on the change in the supply side. The time t5 until the center of change is reached is measured, and the actual steaming time T can be calculated from the time t5, and the preset steaming time T' and the actual value T are compared to ensure that they match. A tea steaming apparatus comprising a control means capable of controlling the changing means so as to control the changing means.