JPH0687737B2 - Batch type dehydrator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a batch-type dehydrator that mainly centrifuges water from wet green tea leaves.

[Prior art]

It is necessary to remove water adhering to the surface of washed fresh tea leaves and wet wet tea leaves as much as possible before processing tea.

The method of removing the adhering water by utilizing the centrifugal force is generally used, and examples thereof include JP-B-60-17237 and JP-A-55-58061.

[Problems to be solved by the invention]

The latter makes it possible to automatically take out fresh tea leaves after the dehydration operation by making the dehydrator itself reversible, but the inversion mechanism is complicated and vibrations tend to occur during centrifugal dehydration. There is.

The former makes it possible to take out fresh tea leaves without inverting the dehydrator itself by removing the bottom of the dehydration tank, but it has the drawback that some of the fresh tea leaves that are put in may fall off as they are. .

It is an object of the present invention to provide a batch type dehydrator which does not have the above-mentioned drawbacks.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention comprises a frame body which is surrounded by side walls to form a dehydration chamber, a central shaft which is rotatably mounted on a central portion of the dehydration chamber in a direction perpendicular to the center, A disk fixed to the lower part of the central shaft, which serves as a bottom plate, and a dehydrating tube which is annularly slidably mounted on the central shaft and which is formed of a perforated plate and is detachable by engaging and disengaging the disk. The bottom of the dehydration tube contacts and engages the bottom plate as the lower limit, and means for sliding the dehydration tube up and down and a member for guiding the water dehydrated under the dehydration chamber to the outside are provided. At the time of operation, the dehydration cylinder is lowered to the lower limit and rotated through the central shaft, and after the dehydration operation, the dehydration cylinder is pulled up and only the disc is rotated and taken out.

〔Example〕

Therefore, the present invention will be described based on the embodiments shown in FIGS. 1 is a dehydration chamber surrounded by four side walls 12 on the upper side.
The frame body 11 is formed.

Reference numeral 2 denotes a central axis that is vertically mounted around the center of the dehydration chamber 11. Reference numeral 21 is a bearing that supports both ends of the central shaft 2, 22 is a V pulley mounted on the lower end of the central shaft 2, and 23 is a motor equipped with a V pulley 24 linked to the V pulley 22. Also, dehydration room 11
A disk 28 serving as a bottom plate is fixed to the lower part of the central shaft 2 inside.

Reference numeral 4 denotes a dehydrating cylinder which is annularly mounted on the central shaft 2 and is formed of a perforated plate having a large number of small holes or a wire mesh. The dehydration cylinder 4 is fixed to a cylinder shaft 45, which is rotatably and vertically slidable with respect to the central shaft 2, by a connecting punch 46 at its upper portion. Further, the lower side cylinder of the dehydration cylinder 4 is formed to be joined to the disk 28. When the dehydration cylinder 4 and the cylinder shaft 45 are lowered to the lower limit, the lower side circumference is joined to the disk 28 to form the dehydration cylinder 4 and the disk 28 serving as the bottom.
The dehydration tub A is formed by and the projection 46 at the lower end of the cylinder shaft 45 is inserted into and engaged with the projection 29 of the disk 28, so that the dehydration cylinder 4 and the cylinder shaft 45 can store fresh tea leaves, and It becomes rotatable together with the central shaft 2.

Reference numeral 5 is a drive means for vertically sliding the dehydration cylinder 4 and the cylinder shaft 45 with respect to the center shaft 2. The means 5 includes an air cylinder 51 fixed downward to the upper frame 1 of the center shaft 2, and an air cylinder 51 at the upper part. And an elevating arm 53 which is fixed to the tip of the rod 52 and whose lower portion is axially attached to the outer periphery of the cylindrical shaft 45. Air cylinder 51 rod
When 52 is fully extended, the dehydrating cylinder 4 and the cylinder shaft 45 are at the above lower limit, and when the rod 52 is fully contracted, a sufficient space a is formed between the lower side cylinder of the dehydrating cylinder 4 and the disk 28.

Reference numeral 6 denotes a bottom surface of the dehydration cylinder 11, which is a member that guides the water separated during the dehydration operation to the outside. The opening / closing door 61 is divided into two at the center and is inclined so that the center side is high and the side portions are low.
And an opening / closing link 62 and an air cylinder 63, which open and close the opening / closing door 61 centered on the side when the fresh tea leaves are taken out.

Reference numeral 7 denotes a feeding conveyor whose end faces the dehydrating cylinder 4 and supplies wet tea leaves into the dehydrating cylinder 4. 8 is
It is a take-out conveyor for arranging the starting end portion thereof under the dehydration chamber 11 and for carrying the dehydrated and taken-out fresh tea leaves to the outside.

Reference numeral 9 denotes a drive motor 23 for the central shaft 2, an air cylinder 51 for vertically sliding the dehydration cylinder 4, and an air cylinder 6 for opening and closing the opening / closing door 61.
3. A control panel for controlling the operation, stop, and rotation speed of the loading / unloading conveyors 7 and 8, the surface view of which is shown in FIG. Reference numeral 91 is a power switch, and 92 is an operation time timer 93 of the feeding conveyor 7 for varying the amount of fresh tea leaves to be fed, and a dewatering time timer 93 for changing the dehydration operation time according to the amount of water adhering to the fresh tea leaves.

Reference numeral 10 is a brake for eliminating free running of the central shaft 2, which is effective for efficiently extracting fresh tea leaves, but it is not necessary. 41 is a nylon net which is attached along the inner peripheral surface of the dehydration cylinder 4 with a margin, and with this,
When the dehydration tube 4 is stopped and taken out, the fresh tea leaves attached to the inner peripheral surface are easily peeled off.

Therefore, the operation of dehydrating the fresh tea leaves to which water drops adhere will be described in order.

(1) Preparation before the start The dehydration operation time T2 is set according to the degree of adhesion of the water droplets on the fresh tea leaves. For example, 30 seconds is standard.

Further, in consideration of the apparent density of the fresh tea leaves and the carrying capacity of the feeding conveyor 7, the feeding time T1 of the feeding conveyor 7 is set so as to feed an appropriate amount of the fresh tea leaves into the dehydration tank A.
For example, it takes about 12 seconds to add 10 kg of fresh tea leaves.

In addition, the extraction time T3 of fresh tea leaves may be constant regardless of the fresh tea leaves to be fed.

Therefore, fresh tea leaves to which water to be dehydrated adheres are sequentially put into the hopper 71 of the feeding conveyor 7.

(2) Inserting fresh tea leaves As shown in FIG. 2, with the dehydration cylinder 4 and the disk 28 forming a dehydration tank A, the dehydration tank is rotated at a low speed together with the central shaft 2. (Although it may be stopped, when it is rotated a little, the fresh tea leaves spread evenly on the disk 28, so it is easy to spread the fresh tea leaves evenly on the inner peripheral wall even during high-speed rotation.) Then, the feeding conveyor 7 is operated for T1 hour. Then, a predetermined amount of fresh tea leaves is added.

(3) Dehydration operation When the supply of fresh tea leaves is completed, the dehydration tank A is rotated at high speed to start dehydration by centrifugation. The high-speed rotation speed varies depending on the diameter of the dehydration cylinder 4, but is usually 700 rpm.

The fresh tea leaves are evenly spread on the inner peripheral surface of the dehydrating cylinder 4 by the centrifugal force. The adhering water droplets are gradually separated from the fresh tea leaves, and go out through the small holes of the dehydrating cylinder 4 and are shaken off. The splashed water droplets hit the four side walls 12 and flow along the side walls 12 to open / close the door 61.
It drops upward and flows outward.

When the dehydration operation is performed for about 30 seconds, most of the water droplets adhering to the surface of the fresh tea leaves are separated.

(4) Extraction of fresh tea leaves When the dehydration time T2 has elapsed, first, the rotation of the dehydration tank A is stopped. Next, the rod of the air cylinder 51 is contracted to raise the dehydration cylinder 4 along the central axis to form a space a between the dehydration cylinder 4 and the disk 28. At the same time, the opening / closing door 61 is opened. The state shown in FIG. 3 is obtained. Then, the central shaft 2 and the disk 28 are rotated.

When the dehydration tank A stops, the fresh tea leaves, which have been attached to the inner peripheral surface of the dehydration cylinder 4 by centrifugal force, drop onto the disk 28 due to gravity. Then, due to the centrifugal force generated by the rotation of the disk 28, the disk 28 scatters from the space a and falls onto the starting end of the takeout conveyor 8. The fresh tea leaves are carried out by the take-out conveyor 8. The take-out time is about 15 seconds.

(5) Preparation for shifting to the introduction of fresh tea leaves When the removal of one fresh tea leaf has been completed, the rotation of the central shaft 2 is stopped, the dehydration tank A is formed, and the opening / closing door 61 as shown in FIG.
Close. Then, the process is restarted from the above (2) so as to dehydrate the next fresh tea leaves.

Thereafter, the above operations (2) to (5) are repeated until all the wet fresh tea leaves are dehydrated.

FIG. 6 shows a standard time chart of the dehydration operation from the above (2) to (5).

〔effect〕

This invention is a dehydration tank A for centrifuging water drops from fresh tea leaves.
Is composed of a disk 28 which is a bottom plate fixed to the central shaft 2 and a dehydrating cylinder 4 which is vertically slidable with respect to the central axis. The disk 28 and the dehydrating cylinder 4 are connected to each other during the operation of feeding and dehydrating fresh tea leaves. It is possible to store and dehydrate fresh tea leaves by joining them, and at the time of removal, separate them to form a space a to allow fresh tea leaves to be taken out from the bottom. It is possible to do. Therefore, unlike the conventional case, there is no bottom of the dehydration layer and a part of the fresh tea leaves that have been thrown in does not fall as it is, and the dehydration operation of the fresh tea leaves is surely performed one by one and the dehydration layer itself. Since it can be taken out without inverting, the structure is simple and strong, and even if the fresh tea leaves are biased during centrifugal dehydration, vibration is unlikely to occur and is durable and long-lasting.

Further, since the upper and lower ends of the central shaft 2 which rotates at high speed can be firmly fixed by the bearings 21 and 22, the resistance to the deviation of the green tea leaves is further enhanced.

When the fresh tea leaves are taken out, the dehydrating cylinder 4 is detached from the disk 28 to form a space a therebetween, and the disk 28 is rotated, so that the fresh tea leaves do not remain quickly due to the centrifugal force of the disk 28. Removed and taken out.

Since a member for guiding the separated water to the outside is arranged under the dehydration chamber 11, it does not scatter to the outside and does not fall on the already dehydrated tea leaves.

[Brief description of drawings]

FIG. 1 shows a loading / unloading conveyor 7 according to an embodiment of the present invention.
8 is an overall front view, FIG. 2 and FIG. 3 are state views of the right side view of the embodiment at the time of introducing and dehydrating fresh tea leaves, respectively.
FIG. 4 is a state diagram at the time of taking out, and FIG.
Of FIG. 5, FIG. 5 is a front view of the control panel 9, and FIG. 6 is a time chart. 1 ... Frame 12 ... Side wall 2 ... Center axis 28 ... Disk 4 ... Dehydration cylinder 5 ... Vertical sliding means 6 ... Member for guiding water droplets to the outside

Claims (1)

[Claims] 1. A frame body having a dehydration chamber surrounded by side walls, a central shaft rotatably mounted around a central portion of the dehydration chamber in a vertical direction, and fixed to a lower portion of the central shaft. A disk serving as a bottom plate, a dehydrating cylinder which is annularly slidably mounted on the central axis and slidable up and down with respect to the central axis, and which is formed of a perforated plate and can be engaged with and disengaged from the disk, and a lower side of the dehydrating cylinder serves as a bottom plate It consists of means for sliding the dehydration tube up and down with the place where it comes into contact and engagement as the lower limit, and a member for guiding the water dehydrated under the dehydration chamber to the outside. It is a batch-type dehydrator in which the dehydration cylinder is pulled up after the dehydration operation, and only the disk is rotated to take out.