JPH07159034A - Dryer for wet food and the like - Google Patents

Abstract

PURPOSE:To improve drying performance, reliability by repeatedly granulating and heating raw material to enhance fluidity and a heat exchanging efficiency and dry uniformly. CONSTITUTION:The dryer for food and the like comprises a screw feeder 3 connected to a lower part of a drying cylinder 1 and a raw material supply hopper 2 to receive and feed supplying or drying raw material (a), a blower 5 connected to the feeder 3 to feed under pressure the material (a) together with input gas and hot gas, and a circulating cylinder 6 connected to the blower 5 to feed the material (a) to diffuse it into a ceiling 11 in the cylinder 1. Further, the dryer comprises a plurality of stages of partition plates 12 with dropping holes arranged in the cylinder 1, heating means 20 attached to the plates 12, and agitating scrapers 15 arranged on the plates 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drier for damp foods, which dries residue (okara), various vegetables and wastes of seafood during tofu production.

[0002]

2. Description of the Related Art A large amount of residue (okara) produced during the production of tofu is directly consumed as food, etc., and the majority of it is discarded, but it is a highly moist powder with a water content of 90% or more. Since it is bulky and heavy, and it requires a lot of labor and time to handle and dispose of it, this residue (okara) is dried to make it lightweight and easy to store in bags, and it is effective for animal and plant feed and fertilizer. Proposed to be used. For example, a drier for wet foods has been developed, which uses a crusher to loosen the residue (okara) to improve fluidity and to let it flow in a series of far infrared ray drying tubes together with hot air, and emit far infrared rays to dry it. .

[0003]

A conventional drying apparatus for wet foods, when drying a highly wet powdery substance such as the above-mentioned residue (okara), does not have to be loosened once by a crusher as described above. There is a limit to the atomization, it is necessary to mix a large amount of hot air to impart fluidity and distribute it,
There are problems that the heat exchange efficiency and the processing efficiency are lowered, and the dispersion of the drying is apt to occur, and that the apparatus becomes large and the initial cost increases.

The present invention was developed in order to address the above-mentioned problems. The object of the present invention is to improve the fluidity and heat exchange efficiency by repeating atomization and heating of the raw material. An object is to provide a drying device for wet foods, which has uniform drying and improved drying performance and reliability.

[0005]

DISCLOSURE OF THE INVENTION The present invention is directed to a screw feeder which is connected to a lower portion of a drying cylinder and a material supply hopper and which receives and transfers a material being supplied or dried, and an air intake member which is connected to the screw feeder. And a blower that sends the raw material under pressure with hot air, a circulation tube that is connected to the blower to transfer the raw material and blows it onto the ceiling of the drying cylinder, a partition plate with multiple drop holes arranged in the drying cylinder, and a partition plate By providing a heating means attached to the above and a stirring and scraper arranged on each of the above-mentioned partition plates, it is possible to improve the fluidity and heat exchange efficiency by repeating the atomization of the raw material, and to even out the drying process to achieve rapid drying. Is dried.

[0006]

[Function] The raw material supplied from the raw material supply hopper is transferred to the blower by the screw feeder, and is agitated and pressure-fed with the intake air and hot air by the blower and the circulation cylinder and sprayed to the ceiling in the drying cylinder, The particles are effectively atomized and dispersed by collision and scattering, and are further agitated and swirled and heated by the uppermost partition plate and agitation / scraper to be efficiently primary dried, and then dropped to repeat similar drying several times. It is returned, and the transfer and drying are continuously repeated by circulation to be smoothly performed, and the raw material is effectively atomized to improve the fluidity and the heat exchange efficiency, and the drying is even. It is liquefied and dried rapidly, resulting in excellent dry processing performance and reliability.

[0007]

1 and 2 show an embodiment of the present invention. In the drawing, 1 is a drying cylinder, 2 is a raw material supply hopper for the raw material a to be dried, 3 is a screw feeder for the raw material a being supplied or being dried, 5 is a blower that also serves as a stirrer for pressure-feeding the raw material,
Reference numeral 6 denotes a blower and a circulation cylinder connected to the upper part of the drying cylinder 1, 8 denotes a dry product discharge cylinder branched through a switching damper 7 in the middle of the circulation cylinder, 11 denotes a ceiling inside the dry cylinder 1, and 12 denotes inside the dry cylinder. A partition plate with a plurality of stages of falling holes 14 disposed therein, 15 an agitator / scraper disposed on each partition plate, 20 heating means for the partition plate, 24 an exhaust port, and 25 a lower part of the drying cylinder 1. A circulating shout provided, 26 is a motor with a speed reducer 27 for driving, a is a raw material (wet foods) to be dried, b to j are movement paths of the raw material, and in the illustrated embodiment, the drying cylinder 1 and the raw material are used. A screw feeder 3 that is connected to the lower part of the supply hopper 2 and receives and transfers the raw material a that is being supplied or dried, and a raw material a that is connected to the screw feeder and that is connected to the screw feeder and that has intake air or hot air.
Blower 5 for pressure-feeding, and circulation cylinder 6 connected to the blower for transferring raw material a and spraying it on ceiling 11 in drying cylinder 1.
A partition plate 12 having a plurality of stages of falling holes 14 arranged in a drying cylinder, a heating means 20 attached to the partition plate, and a stirrer / scraper 15 arranged on each partition plate. It is a drying device.

More specifically, the illustrated drying apparatus for wet foods has a drive control mechanism including a control panel 30, a controller 31, and control means 32a to 32e as shown in FIG. Various control patterns based on data such as types of wet foods to be processed, powder particle size, and degree of wetness are input in advance, and when the control panel 30 is operated, control signals 30a and 31a having control patterns corresponding to wet foods are output. In the power transmission system of the motor 26, each control means 3
The screw feeder 3, the blower 5, the stirring and scraper 15, the heating means 20 and the switching damper 7 are drive-controlled by 2a to 32e (manual operating means is also provided, not shown).

For example, when the residue (okara) at the time of tofu production is used as the raw material a to be dried, when the control panel 30 is operated,
The motor 26 operates and the control signals 30a and 31a of the control pattern corresponding to the raw material a are output, and the control means 32 are provided.
Each part of the drying device is sequentially driven and controlled by a to 32e. That is, the screw feeder 3 is connected to the lower side of the raw material supply hopper 2 with the circulation shout 25 and the valve 2a at the lower part of the drying cylinder 1, and is rotationally controlled by the control means 32a to supply from the raw material supply hopper 2. The raw material a being dried or circulated from the circulation short 25 is smoothly transferred to the blower 5 at a controlled speed together with the intake air (from the raw material supply hopper 2) and the hot air (from the drying cylinder 1) (arrow direction). Direction b).

The blower 5 has a plurality of blades 5a obliquely installed at an appropriate rearward inclination angle (about 53 degrees) with respect to the rotation direction, and the rotation of the blades 5a is controlled by the control means 32b. The mixture is appropriately stirred and pressure-fed with the intake air and the hot air to the circulation cylinder 6 at a predetermined high speed (arrow direction c), and the circulation cylinder 6 has its upper and lower ends communicating with the blower 5 and the upper wall of the drying cylinder 1. The raw material a sent from the blower 5 is transferred at high speed together with the intake air and the hot air (arrow direction d), and is sprayed from the upper end portion 6a thereof to the ceiling 11 in the drying cylinder 1 widely in the arrow direction e and swirled appropriately. Then, the raw material a is collided and scattered to be positively atomized and uniformly dispersed.

The drying cylinder 1 has a heat insulating layer (a space, if necessary filled with a heat insulating material) 1a in the periphery and an exhaust port 24 in the upper portion,
Ceiling 11 that scatters raw material a sprayed inside
Alternatively, the partition plate 12 and the agitator / scraper 15 are arranged in a plurality of stages, and the circulation shout 25 and the screw feeder 2 are arranged below. As shown in the figure, each partition plate 12 partitions the inside of the drying cylinder 1 into a plurality of stages at upper and lower intervals, and a heating means 20 (a warm water generator 21, an inflow port 22a and an outflow port) is provided in a hot water circulation chamber 13 formed therein. Hot water pipe 22 with 22b) is attached, the hot water generator 21 is controlled (water temperature, flow rate) via the control means 32c, and the heated water is circulated in the direction of the arrow to control the hot water circulation chamber of each partition plate 12. A hot plate mechanism that heats the raw material a by circulating it in the inside 13 together with hot air is provided, and a drop hole 14 for the raw material a is provided in each partition plate 12 (see FIG. 2). The stirring and scraper 15 is disposed on each partition plate 12 and has a common drive shaft 16
It has a stirring bar 17 and a scraper 18 which are rotationally controlled by the partition plate 12 which is rotationally controlled by a control means 32d.
The above material a is appropriately stirred and transferred by a stirring bar 17, transferred by a scraper 18, swirled in a direction g as indicated by an arrow, heated and dried, and then dropped h from a drop hole 14 to the next stage.
After repeating the stirring, swirling, and heat drying a plurality of times (three times in the illustrated example), the raw material a being dried is sent together with hot air from the circulation shout 25 to the screw feeder 2 for circulation, and the above steps are continued. It has a structure that it is repeatedly and repeatedly dried.

In the drying cylinder 1, the raw material a is sprayed at a high speed from the upper end portion 6a of the circulation cylinder 6 toward the ceiling 11 in the drying cylinder 1 in the direction e as shown by the arrow, and is slightly deflected as shown in the figure. Is widely collided with the ceiling 11 and is scattered in the direction f of the arrow in the form of an appropriate swirling flow, and the collision causes the particles to be finely divided and dispersed, and further, the uppermost partition plate 1
The stirring and scraper 15 which is rotationally driven on 2 receives a proper amount of stirring to generate a swirling flow g, and the hot water circulation chamber 1 of the partition plate 12
It is heated by the heated water in 3 to be primarily dried and then dropped to the next stage from the drop hole 14 (direction h in the arrow direction), and is efficiently heat-exchanged and dried on the uppermost partition plate 12, and then the next. The same secondary drying and tertiary drying are repeated by the partition plate 12 and the agitator / scraper 15 at the lowermost stage, and then sent from the circulation shout 25 to the screw feeder 3 again to be circulated and continuously dried. Is repeated. Also,
During the above-mentioned drying, an appropriate amount of hot air is discharged from the exhaust port 24 provided in the upper part of the drying cylinder 1, and accordingly, the raw material supply hopper 2 is introduced to supplement the hot air, and the hot air is appropriately exchanged and heated and dried together with the transfer. Is carried out smoothly.

The degree of drying of the raw material a is, for example, the exhaust port 24.
It is easily judged by detecting the humidity of the exhaust gas by a sensor (not shown) provided in the above, and the switching damper 7 provided in the middle of the circulation cylinder 6 is switched as indicated by the dotted line by the control of the control means 32e based on the detection signal. Then, the dried product is taken out by the discharge tube 8 branched in the middle of the circulation tube 6 and received in the container 29. A manual operation means is also provided (not shown). For example, the scattering state of the raw material a inside is observed through a viewing window provided on the side of the drying cylinder 1, and the degree of dryness thereof is detected to switch. Manual operation for switching the damper 7 is also possible (not shown).

As described above, the raw material a is agitated and pressure-fed by the blower 5, sprayed and scattered to the ceiling 11 in the drying cylinder 6 by the circulation cylinder, and then appropriately divided by the plurality of partition plates 12 and the agitation / scraper 15. The continuous drying is carried out by repeating the stirring and swirling, the heating and drying, and the circulation. Even extremely high-humidity foods such as the above-mentioned residue (okara) can be smoothly transferred by repeating the above-mentioned granulation and heat drying, and the heat exchange efficiency can be remarkably enhanced to dry quickly. It is processed.

As shown in the figure, 48 kg of okara (water content: 90%) was put into a drying device having a partition plate 12 and a stirring / scraper 15 arranged in three stages, and the result was about 2
A fully dried product was obtained in 0 minutes. It is dried about 10 minutes earlier than conventional dryers. Even if this drying process was repeated every day, the electricity bill / month was about 20,000 yen, which was a significant reduction. That is, the device is significantly downsized and provided at a low cost, and the initial cost is significantly reduced.

In the above-mentioned embodiment, the drying treatment of the residue (okara) which is mainly produced during the production of tofu has been explained.
The same applies to wastes such as various seafood containing a large amount of water. If necessary, these wastes are pulverized by a pulverizer (not shown) and dried. Further, the heating means may be hot air instead of the illustrated heated water and is designed in various mechanisms. The above-mentioned drying device is designed in the size of the drying cylinder corresponding to the type of raw material to be dried, the amount of treatment, etc., the number of partitions and the number of stages of the agitation and scraper.

[0017]

According to the present invention, the raw material supplied from the raw material supply hopper constructed as described above is transferred to the blower by the screw feeder, and is agitated and pumped together with the intake air and the hot air by the blower and the circulation cylinder, It is sprayed on the ceiling in the drying cylinder and is positively collided and scattered to be effectively granulated and dispersed, and is also agitated and swirled by the uppermost partition plate and agitation and scraper to be efficiently heated and primary dried. After that, it is dropped and similarly subjected to secondary drying and tertiary drying, and is circulated again to repeat the above-mentioned transfer and drying continuously and repeatedly, and the raw material is effectively granulated, and heat exchange is performed together with fluidity. Drying performance and reliability are remarkably improved, for example, the efficiency is remarkably increased, the drying is made uniform, and the drying treatment is rapidly performed to remarkably improve the treatment efficiency.

Therefore, there is an advantage that the device can be downsized and provided at low cost, and the initial cost can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view (A) and a control block diagram thereof (B) showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line XX of FIG.

[Explanation of symbols]

 1 Drying Cylinder 2 Raw Material Supply Hopper 3 Screw Feeder 5 Blower 6 Circulation Cylinder 11 Ceiling 12 Partition Plate 14 Falling Hole 15 Stirring and Scraper 20 Heating Means a Raw Material (wet foods)

Claims (1)

[Claims] 1. A screw feeder connected to a lower portion of a drying cylinder and a raw material supply hopper and configured to receive and transfer a raw material being supplied or dried, and a screw feeder connected to the screw feeder to feed the raw material together with intake air and hot air. With a blower
A circulation tube connected to the blower to transfer the raw material and blow it onto the ceiling in the drying tube, a partition plate with a plurality of stages of falling holes arranged in the drying tube, and heating means attached to the partition plate, A drier for wet foods, comprising a stirrer / scraper arranged on each of the partition plates.