JP2640107B2 - Multi-chamber aeration rotary dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-chamber ventilated rotary drying apparatus, and more particularly to a rotary chamber, in which a plurality of small chambers are formed by dividing the inside of a rotary drum with a permeable metal plate and forming each of the chambers. The chamber is characterized by an independent drying drum.

(Prior Art) In general, when an object to be dried made of granular powder is unraveled and continuously dried with hot air to obtain an independent granular material of each particle, a ventilation rotary drying apparatus is used.

FIGS. 2 and 3 show a drying apparatus of a ventilation rotation type as an example, and reference numeral 11 in the figures denotes a rotating drum. This is the main part of the aeration rotary drying apparatus, which is the drying material input area 11a, the drying area 11b, and the drying product removal area 11a.
A rail 12 is wound around the outer periphery of the dried material input area 11a and the dried product removal area 11c, and the rail 12 is supported by a pair of front and rear rollers 13f and 13r.
Although not shown, a ring gear is attached to the outer periphery of the material-loading area 11a, and a small gear is meshed with the ring gear. The driving force of the small gear rotates the rotary drum 11 at an appropriate speed. It has become.

A drying object charging chute 14 is provided on an end face of the drying material charging area 11a so as to charge the drying material into the body, and a product outlet 15 is provided at a rear end of the dried product discharging area 11c. Is provided to take out the dried granules.

The dry area 11b forms the main body of the apparatus, and the body is formed using a wire mesh, punched metal and other countless small holes and a breathable plate material with slits, and the inner surface is formed on the inner surface. A scraping louver 16 is attached, and as the rotating barrel 11 rotates, the objects to be dried in the barrel are sequentially scraped up and stirred, mixed and uniformly dried, and by the impact force at that time. The material to be dried is unraveled, so that the particles are not joined or entangled, so that the particles are made independent of each other. Dried area 11b
A casing 17 is provided outside the casing. This casing 17 is a kind of duct, and a hot air intake 18
A heater 19 and a blowing fan 20
Are connected to each other, hot air is taken into the casing, and an exhaust port 21 is formed in the upper portion, from which exhaust gas from the dryer is discharged.

(Problems of the prior art) By the way, in this drier, as the rotating drum 11 rotates, the material to be dried is subjected to the frictional force with the inner peripheral surface of the rotating drum and the scraping louver 16.
As it rises along the inner peripheral surface and falls in order when it reaches a certain height, the whole is uniformly stirred and mixed and dried evenly, and it is unraveled by the impact force at the time of falling, Although it is suitable for drying powders and granules, on the other hand, the amount of dry matter in the barrel is regulated, and when the amount of dry matter in the barrel becomes more than a certain amount, it may not be stirred and mixed completely become.

Therefore, in order to increase the processing capacity, it is necessary to increase the size of the apparatus. However, in this case, the production cost and other costs increase, and the impact force applied to the powder and granules increases, and the powder and granules increase. However, there is a disadvantage that the object to be treated is limited and the defective rate increases because the possibility of crushing and powdering increases.

Conventionally, as shown in FIGS. 4 and 5, a ventilating air duct 22 is provided on the center line of the rotating drum 11, and a heater 19 and an air fan 20 are connected to the rotating duct 11 as a measure for solving such a drawback. Then, hot air is directly blown into the rotary drum 11 from the blow duct 22, and the rotary drum 11 is partitioned by a non-permeable partition wall 23 to form a plurality of small chambers 24.
Was made into an independent small rotating drum (small chamber type air-drying system).

In this drying apparatus, the individual small chambers 24 are much smaller than the rotary drum 11 and the impact force applied to the material to be dried is smaller than that of the above-mentioned conventional ventilation rotary drying apparatus. Is significantly reduced, so that fragile powders can be processed.
Hot air is blown from the air duct 22 into each small chamber 24,
If the air duct 22 is formed thin, the small chambers 24 become too narrow, causing drying unevenness. Have.

In particular, this drying apparatus has a surface into which hot air is blown (blower duct 22) and a surface from which hot air is discharged (rotary drum 11) as shown in small chambers 24a and 24b when the amount of material A to be dried in small chamber 24 is small.
A hot air passage is generated between the small room and the small room, and the hot air is wasted in this small room. In order to eliminate such a problem, it is necessary to fill the small chamber 24 with a large amount of the material to be dried. However, in this case, the material to be dried cannot be stirred or mixed. The function of the device is completely lost.

(Means for Solving the Problems) The present invention is intended to solve the above-mentioned drawbacks of the conventional air-permeable rotary drying apparatus so that fragile powders can be efficiently dried. The inside is divided by an air-permeable metal plate to form a plurality of fan-shaped small chambers, each of which is an independent drying cylinder, and hot air is blown from the lower half of the rotating cylinder.

(Example) Hereinafter, the present invention will be specifically described based on an illustrated example.

The figure shows a longitudinal section of the central part of the multi-chamber ventilation rotary drying apparatus according to the present invention. In the figure, reference numeral 1 denotes a rotating drum, and 2 denotes a casing. There is almost no difference from these already described conventional ones. That is, the rotating drum 1 is made of wire mesh, punching metal,
It is formed using a breathable metal plate with countless other small holes and slits, and although not shown, an area for inputting the material to be dried and an area for removing the dried product are formed. Chutes and dried product outlets are provided.

The interior of the rotating drum 1 is divided by a gas permeable metal plate 8 to form a plurality of fan-shaped small chambers 3.

The casing 2 also functions as a ventilation duct by covering the rotary drum 1 as in the conventional case. The casing 2 has an exhaust port 4 formed in the upper part and a hot air intake port 5 formed in the lower part. The heater 6 and the blower fan 7 are connected to each other so that hot air for drying is sent into the casing 2. Further, the inside of the casing 2 is a rotating body 1
The partition wall 9 is provided at a position at which the hot air is divided into upper and lower parts, and prevents the free flow of hot air in the casing 2, and the hot air sent into the casing 2 from the hot air inlet 5 passes through the lower half surface of the rotary drum 1. Pass through the rotating drum 1 and enter the lower chamber 3L, 3L
… Dries the dried object A filled in it,
Further, the material A to be dried is passed through the small chambers 3U, 3U,... In the upper half, dried out of the rotary drum 1, and discharged through the exhaust port 4 to the outside of the machine.

(Effects) As described in detail above, according to the present invention, a plurality of fan-shaped small chambers are formed by dividing the inside of a gas-permeable rotary drum with a gas-permeable metal plate, and each of the small chambers is formed into a small rotary drum. In the casing, a partition wall is provided at a position where the rotary drum is vertically divided into two parts.
As in the case of the small-chamber ventilated rotary drying apparatus shown in FIG. 5, the powdering rate of the dried substance is reduced, so that the fragile dry substance can be processed. Since the filling rate of the object to be dried in the small chamber can be increased as compared with the drying efficiency of the dryer of the system, the drying efficiency is improved.

Moreover, since the hot air effectively acts on the material to be dried even if the material to be dried is not excessively filled in the small chamber as in a small-chamber type ventilation rotary dryer, the material to be dried is sufficiently stirred and mixed in the small room. And drying can be performed uniformly, and the drying efficiency is improved in this respect as well. In particular, the hot air is divided into small chambers 3
After passing through L, 3L, etc., it further passes through the upper chambers 3U, 3U, etc., so that the heat utilization efficiency is further enhanced, contributing to an improvement in drying efficiency.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. FIG. 2 is a vertical sectional front view showing a conventional ventilation rotary drying apparatus of a ventilation rotation type. FIG. 3 is a vertical side view of the same. FIG. FIG. 5 is a vertical sectional side view showing the rotary dryer, and FIG. DESCRIPTION OF SYMBOLS 1 ... Rotating body, 2 ... Casing 3 ... Small chamber, 4 ... Exhaust port 5 ... Hot air intake, 6 ... Heater 7 ... Blow fan, 8 ... Metal plate 9 ... Partition wall

Claims (1)

(57) [Claims] 1. A ventilation rotary drying device comprising a gas permeable rotary drum covered with a casing, wherein the rotary drum is internally partitioned using a gas permeable metal plate to form a plurality of fan-shaped small chambers. An exhaust port is formed at the upper part, a hot air inlet is formed at the lower part, a heater and a blower fan are connected to this, and a partition is provided inside the rotary body at a position where the rotary drum is vertically divided into two parts. A multi-chamber ventilated rotary drying apparatus characterized in that the sent hot air passes through a small chamber in the lower half of the rotating drum and then further through a small chamber in the upper half.