JPH02234639A - Dryer for tea-processing - Google Patents

Abstract

PURPOSE:To obtain a continuous tea-processing dryer having small size and light weight and free from the danger of contamination of rough tea by forming an endless belt net of a conveyor with a net made of a synthetic resin or synthetic fiber. CONSTITUTION:The objective tea-processing dryer contains plural stages of air-permeable conveyors 22 in a drying chamber 1. The air-permeable conveyor 22 is a net conveyor having the form of an endless belt net made of a synthetic resin or synthetic fiber stable to rough tea (e.g. glassfiber-reinforced Teflon(R), nylon-reinforced polyester or aramid resin). The net conveyors are stretched between conveyor chains.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a continuous tea drying machine, and in particular, the present invention relates to a continuous tea drying machine, and in particular, the endless belt-like dryer of the conveyor is connected to a dryer made of synthetic resin or synthetic fiber.
・It is characterized by being formed using.

(Prior Art) In the tea manufacturing process, fresh raw tea confectionery picked from tea gardens is first processed into rough tea, which is then dried using a tea drier.

This tea dryer is a so-called continuous ventilation dryer,
The drying room is equipped with several stages of aeration conveyors such as conveyors or tray conveyors, and drying is carried out while transferring the coarse tea from the upper conveyor to the lower conveyor.

(Problems to be solved by the invention) Although the above-mentioned crude tea is a food or drink, the net conveyor and tray conveyor are toxic, wear out during operation,
Nets and trays must not rust, and in particular must not combine with the tannins contained in rough tea to form insoluble tannin salts. Limited to hard and chemically stable materials such as rust-free steel. Therefore, in the above-mentioned conventional tea drying machine, the conveyor frame, conveyor chain, etc. have to be made sturdy, so the apparatus is inevitably large.

Therefore, it is an object of the present invention to provide a dryer for tea production that is small and lightweight and does not cause the risk of contaminating rough tea.

(Means for Solving the Problems) The present invention uses a dryer ventilation conveyor made of synthetic resin or synthetic fiber that is stable against roughness, such as glass fiber-reinforced deflon, nylon-reinforced polyester, or aramid resin. The created net is a net conveyor with an endless belt-like net.In particular, the endless belt-like net is made separate from the conveyor chain, and is formed slightly longer than the conveyor chain, so that the bottom surface of the conveyor is slightly By creating slack, the time required for the endless belt net to rotate once is slightly longer than the time required for the chain to rotate once, and the connection rod of the endless belt net is Adopt means to change the position of contact with the object.

(Function) As described above, in the tea manufacturing dryer according to the present invention, the endless belt-like net of the aeration conveyor is separate from the conveyor chain, and is formed to be slightly longer than the conveyor chain, so that the rotation time is longer than that of the conveyor chain. By making the rotation time slightly longer than the rotation time, the position where the endless belt net contacts the conveyor chain changes each time the conveyor rotates once, and local wear and tear of the endless belt net is significantly reduced.

As a result, nets made using synthetic resins and synthetic fibers such as glass fiber reinforced DEFRON, nylon reinforced polyester, and aramid resin can now be used as endless belt-shaped nets, which eliminates the risk of deteriorating the quality of rough tea. In addition, the ventilation conveyor becomes lighter and smaller, and the dryer itself becomes lighter and smaller, reducing manufacturing and operating costs.

(Example) Hereinafter, the tea manufacturing dryer according to the present invention will be specifically described based on the illustrated example.

Reference numeral 1 in the figure is a drying room, which is equipped with several stages of ventilation conveyor 2 and sweep-out conveyor 3, with a quantitative supply hopper 4 for supplying rough tea material in the upper part, and a drying chamber in the lower part. A take-out port 5 is formed for taking out the rough tea.

Furthermore, a hot air generator 7 is attached to the drying room 1, and the generated hot air is sent into the room by a blower 8. After drying the rough tea on the ventilation conveyor 2 with this hot air, the drying room 1
It is designed to be discharged to the outside of the machine through an exhaust port 6 formed at the top of the machine.

These are almost the same as ordinary tea dryers of this type, except that the ventilation conveyor 2 is a net conveyor that uses a net made of synthetic resin or synthetic fiber that is stable against rough tea as an endless belt-like net. The same is true.

That is, the quantitative supply hopper 4 is for quantitatively feeding rough tea into the uppermost aeration conveyor 2, and is equipped with a feed conveyor 41 and a leveling roller 42, and is equipped with a feed conveyor 41 and a leveling roller 42 to feed the rough tea placed on the feed conveyor 4l. The rough tea is leveled to a constant thickness by a leveling roller 42, and the feeding amount of the rough tea is quantified.

The sweeping conveyor 3 consists of a pair of left and right chains 3l rotating counterclockwise in the figure and several brushes 32 attached to the chains 3l.
The powdery rough tea spilled on the bottom surface 12 of the cup is swept out toward the outlet 5.

The ventilation conveyor 2 is a so-called net conveyor, and is composed of a conveyor chain 2l and an endless belt-shaped net 22.

The conveyor chain 2l is almost the same as the chain part of a normal net conveyor, and consists of a pair of left and right endless chains 23, 23 and a large number of connecting rods provided at appropriate intervals between both chains 23, 23. 24, which is wound around a pair of front and rear sprockets 25f and 25r.

And both sprockets 25f. A rail 26 is provided between 25r, and the front sprocket 2
A drive device (not shown) is connected to 5f, so that when the sprocket 25f is rotated, the chain 23 rotates along the rail 26.

The endless strip nets 1 to 22 are made of glass fiber-reinforced Teflon, nylon fiber-reinforced polyester, aramid resin, etc., and are inferior in mechanical strength to the K4 wire mesh used in the ventilation conveyor of conventional tea dryers. It is lightweight, has solvent resistance, acid resistance, etc., and is made of a synthetic resin or synthetic fiber that is stable against rough tea.

In particular, this endless strip 22 is connected to the conveyor chain 21.
It is a separate body from the conveyor chain 21, and is only suspended from the conveyor chain 21 and is not connected to it. When the conveyor chain 21 is rotated, its upper surface (outward path) connects with the connecting rod 24. Due to the friction of the conveyor chain 21, it rotates integrally with the conveyor chain 21 at the same speed.

Furthermore, the endless belt-like net 22 is formed to be slightly longer than the conveyor chain 21, so that it is slightly slack on the lower surface (return path) of the conveyor.

That is, the endless belt-like net 22 is longer than the chain 23 between points A and B in the figure.

Since the chain 23 and the endless strip net 22 rotate at the same speed as described above, the time for the chain 23 and the endless strip net 22 to reach from point A to point B is delayed by the length of the endless strip net 22. To become.

In other words, the time required for the chain 23 and the endless belt net 22 to make one rotation is longer for the endless belt net l-22 by the difference in length between points A and B in the figure. , each time these shift by one rotation, a difference equal to the time difference will occur between the two.

Therefore, the position of the endless strip net 22 in contact with the connecting rod 24 changes each time, so the points where the endless strip net 1, 22 contacts the connecting rod 24 are dispersed over the entire surface.
As a result, the endless band-shaped net 22 does not wear out or wear out due to contact with the connecting rod 24 only at a specific point, and problems caused by contact with the connecting rod 24 are significantly reduced.

(Effects of the Invention) The present invention provides an endless belt-shaped net formed using synthetic resin or synthetic fiber such as glass fiber-reinforced Teflon, nylon-reinforced polyester, or aramid resin, which is suspended on a conveyor chain and driven directly to the endless belt-shaped net. This is a dryer equipped with an aerated conveyor that rotates the conveyor without applying any force.In particular, the endless belt-shaped net is separate from the conveyor chain, and is slightly longer than the conveyor chain. The bottom surface is slightly slack.

Therefore, the time required for the endless belt net to rotate once is slightly longer than the time required for the chain to rotate once, and the position of contact with the connecting rod of the endless belt net changes each time the conveyor chain rotates once. Therefore, unlike when the endless strip net is connected to a chain, specific points do not always come into contact with the connecting rods, but the points in contact with the connecting rods are distributed over the entire surface. Therefore, the resistance of the endless belt net to defects caused by contact with the connecting rods, such as apparent wear and tear, is significantly increased, and it has higher tensile strength and resistance than the conventional endless belt net (1) or wire mesh of the conventional transfer conveyor. It is now possible to use a net made of synthetic resin or synthetic fiber, such as glass fiber reinforced Teflon, nylon reinforced polyester, or aramid resin, which has low abrasion resistance.

As a result, there is no risk of rough tea being altered or slipping due to netting, and the aeration conveyor is lightweight and compact, and the dryer itself is lightweight and compact, reducing manufacturing and operating costs.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a tea dryer according to the present invention, FIG. 2 is a schematic diagram showing an example of an aeration conveyor,
Figure 3 is a plan view showing the main parts of the above, Figure 4 is a vertical front view,
FIG. 5 is a longitudinal side view. 1. Drying room 2: Ventilation conveyor 3: Sweeping conveyor 5: Take-out port 7: Hot air generator 21: Conveyor chain 23: Chain 25: Sprocket 4: Fixed amount supply hopper 6: Exhaust port 8: Blower 22/endless strip net 24: Connecting rod 26: Rail

Claims (1)

[Claims] In a tea drying machine, the drying chamber has a quantitative supply hopper at the top, an outlet at the bottom, and several ventilation conveyors inside.The ventilation conveyor is an endless conveyor made of synthetic resin or synthetic fiber. A tea drying machine characterized by a belt-shaped net suspended on a conveyor chain.