JPH0989453A - Grain dryer using far-infrared rays - Google Patents

Abstract

PROBLEM TO BE SOLVED: To irradiate a circulating flow of grain with far-infrared rays evenly so that the grain can be dried evenly and efficiently without causing unevenness of drying. SOLUTION: There are provided a grain-storing tank 2 in the upper part of a drying- machine body 1, an aeration-drying part 3 in its middle part, and a grain-discharging tank 4 in its lower part. The grain stored in the grain-storing tank 2 is aerated to dry at the aeration-drying part 3 as the grain circulates, flowing through the aeration- drying part 3, grain-discharging tank 4, and back to the grain-storing tank 2. Inside the grain-discharging tank 4 there are provided far-infrared radiators 21, 22 which emit far infrared rays to the grain that flows down scatteringly or in a thin layer from the aeration-drying part 3. The wall forming the grain-discharging tank 4 is built as a heat-insulating structure consisting of a heat-insulating material 19. Above a conveyor trough 16 of a grain-discharging conveyor 5 a reflecting plate 24 serving as a screen to the far-infrared rays is provided. The conveyor trough 16 is equipped with a grain-pressure sensor 26 in a setup to automatically stop, when abnormality in grain pressure is detected, both the radiation of the far infrared rays from the far infrared radiator and the downward flow of grain from the aeration-drying part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a ventilation drying means for drying circulating fluidized grains with hot air and a far infrared ray drying means for drying by irradiation with far infrared rays to efficiently and evenly dry grains. The present invention relates to a far infrared ray-based grain dryer.

[0002]

2. Description of the Related Art A grain storage tank is provided in the upper stage of a dryer main body, a ventilation drying section is provided in the middle stage, and a grain extraction tank is provided in the lower stage, and the ventilation drying section, grain extraction tank, and grain storage tank of the grain stored in the grain storage tank are provided. A grain dryer that circulates and circulates through a passage to dry in a draft dryer is described in Japanese Patent Publication No. 5-22834 or Japanese Patent Laid-Open No. 6-3052. In this conventional grain dryer, a draft dryer is used. Far infrared rays are radiated from the side surface of the drying passage to the grain flowing down the drying passage to cross the drying passage, so that the drying by the far infrared rays is also performed to improve the efficiency of drying.

[0003]

However, in the case of irradiating far infrared rays so as to cross the drying passage of the ventilation drying section like the above-mentioned conventional grain dryer, the grain flows down in the drying passage in a full state. Therefore, there is a considerable difference in the amount of heat received by the far infrared rays from the far infrared ray irradiating side of the drying passage and the opposite side, causing uneven drying in the width direction of the drying passage and evenly distributing the grain. It turns out that it cannot be dried.

Therefore, in the present invention, a far-infrared radiator is provided in a grain extraction tank in which grains flowing down through a ventilation drying section flow in a scattered or thin layer state, so that far-infrared rays are evenly distributed to grains circulating and flowing. An object of the present invention is to provide a far-infrared ray-using grain dryer capable of efficiently drying grains uniformly by irradiation without causing uneven drying.

[0005]

In order to achieve the above object, a far infrared ray-based grain dryer according to the present invention comprises a grain storage tank in the upper stage of a dryer body, a ventilation drying section in the middle stage, and a grain removal tank in the lower stage. In a grain dryer that installs and stores the grains stored in the grain storage tank in a ventilation drying unit, a grain extraction tank, and a grain storage tank while circulatingly flowing in the ventilation drying unit, a ventilation drying unit is installed in the grain extraction tank. The far-infrared radiator that irradiates far-infrared rays is provided to the grain that flows down in a scattered or thin layer, and the wall surface that forms the grain extraction tank has a heat insulating structure.

The grain dryer utilizing far infrared rays according to the present invention is provided with a grain storage tank in the upper stage of the dryer body, a ventilation drying section in the middle stage, and a grain take-out tank in the lower stage, respectively, to store the grains stored in the grain storage tank. In a grain dryer that circulates and flows in the ventilation drying section, grain extraction tank, and grain storage tank while drying in the ventilation drying section, the grains flow into the grain extraction tank from the ventilation drying section in a granular or thin layer state. A far-infrared radiator that irradiates far-infrared rays to the grain is provided, and a reflection plate that shields the far-infrared ray is provided on the grain carrying-out conveyor provided at the bottom of the grain removing tank.

Further, in the far infrared ray-based grain dryer according to the present invention, a grain storage tank is provided in the upper stage of the dryer body, a ventilation drying section is provided in the middle stage, and a grain extraction tank is provided in the lower stage. In a grain dryer that circulates and flows in the ventilation drying section, grain extraction tank, and grain storage tank while drying in the ventilation drying section, the grains flow into the grain extraction tank from the ventilation drying section in a granular or thin layer state. A far-infrared radiator that irradiates far-infrared rays to the grain is installed, and a grain pressure sensor is installed in the transport gutter of the grain carry-out conveyor provided at the bottom of the grain extraction tank. The infrared radiation is automatically stopped, and the flow of grain from the draft drying section is automatically stopped.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a far infrared ray-based grain dryer according to the present invention. FIG. 1 is a front view of the far infrared ray-based grain dryer as a whole, and FIG. FIG. 3 is a side view showing a cutaway view, and FIG. 3 is an enlarged vertical sectional front view of a main part.

A dryer main body 1 is provided with a grain storage tank 2 in the upper stage of the dryer main body 1, a ventilation drying section 3 in the middle stage, and a grain extracting tank 4 in the lower stage.
A grain unloading conveyor 5 is provided below the grain unloading tank 4 over the entire length in the front-rear direction.
And the grain distribution conveyor 6 on the upper part of the grain storage tank 2 are connected by an elevator 7, and the grain carry-out conveyor 5 and the elevator 7
The grain is circulated through the grain storage tank 2, the ventilation drying unit 3, the grain extraction tank 4, and the grain storage tank tank 2 via the grain distribution conveyor 6.

The ventilation drying section 3 has drying passages 8 and 8 formed by ventilation walls, and a hot air supply cylinder 9 forming the drying passages 8 and 8 is provided in a hot air supply chamber 11 containing a burner 10. In communication with each other, the air blast cylinder 12 communicates with an air blast chamber 14 equipped with a suction air blaster 13, so that the grains flowing down from the grain storage tank 2 through the drying passages 8 of the ventilation drying unit 3 are fed into the hot air supply chamber 11. Through the hot air supply cylinder 9 and across the drying passages 8 and 8 to the exhaust hot air cylinder 12 by suction hot air. Feeding rolls 15 and 15 are provided at the lower ends of the respective drying passages 8 and 8 of the ventilation drying unit 3.

The grain take-out tank 4 is slanted from the both sides of the upper part thereof to the transport gutter 16 of the grain carry-out conveyor 5, and the flow grain board 1 is inclined.
It is formed by being surrounded by 7, 17 and both side walls 18, 18. The heat sink 19 and the side walls 18 and 18 are heat insulating materials 19.
And a reflecting plate 20 is laminated on the surface of the heat insulating material 19, and the constituent wall of the grain extracting tank 4 has a heat insulating structure. The heat insulating material 19 is made of glass wool or the like having high heat resistance, and the reflection plate 20 is made of a polished plate such as aluminum or stainless steel.

The far-infrared radiator 2 is provided in the grain extracting tank 4.
1 and 22 are arranged in upper and lower two stages, and the far-infrared radiator 21 has a cylindrical shape extending over substantially the entire length of the grain extracting tank 4 in the front-rear direction. The far infrared rays radiated from the far infrared radiators 21 and 22 are fed from the drying passages 8 and 8 of the ventilation drying unit 3 by the rotation of the feeding rolls 15 and 15, and the grains are laid on the surface of the shed plates 17 and 17. Irradiation is applied to grains flowing down in the form of granules or thin layers. The far infrared radiators 21 and 22 are
It emits far-infrared rays having a wavelength suitable for drying grains by burning fuel. Although the far-infrared radiators 21 and 22 are provided in the upper and lower two stages in the illustrated configuration,
The installation form or the number of installations is arbitrary.

A reflector 23 is provided above the far infrared radiators 21 and 22. This reflector 23 is
Far-infrared rays emitted from the far-infrared radiators 21 and 22 are diffusely reflected in the direction of the shedding boards 17, 17 to produce the shedding boards 1
This is for evenly irradiating far-infrared rays to the grains flowing down on the surfaces of Nos. 7 and 17. Therefore, the shape, the distance from the far-infrared radiators 21 and 22, and the like are determined by the grain plate 17,
It is set to a state suitable for evenly irradiating the surface of 17 with far infrared rays. The reflector 23 is also made of a polished plate of aluminum, stainless steel, or the like.

The transport gutter 16 of the grain unloading conveyor 5 provided in the lower part of the grain unloading tank 4 is constructed to have a capacity larger than the capacity for receiving the amount of grain in a normal transport state. That is, the grain carry-out conveyer 5 stops the feeding rolls 15 and 15 of the drying passages 8 and 8 during the circulation and flow of the grains, and then the drying passages 8 and 8 are provided.
It is set to an appropriate volume that can already accommodate the falling grain by leaving the lower end of the. The transport gutter 16 of the grain discharge conveyor 5 is provided with a reflection plate 24 that covers the upper surface thereof. The reflecting plate 24 has a chevron shape, and a grain inflow passage 25 is formed between both end edges of the reflecting plate 24 and the transport gutter 16. The reflection plate 24 is for shielding the grain accumulated in the transport gutter 16 from far infrared rays emitted from the far infrared ray radiators 21 and 22. The reflecting plate 24 is also made of a polishing plate made of aluminum, stainless steel, or the like.

A grain pressure sensor 26 is provided in the transport gutter 16 of the grain carry-out conveyor 5. This grain pressure sensor 26
Senses that the grain pressure in the transport gutter 16 rises abnormally. Although illustration is omitted, when the grain pressure sensor 26 detects an abnormality in the grain pressure in the transport gutter 16, the burner 10 is stopped to automatically stop the ventilation drying in the ventilation drying unit 3, and the drying passages 8 and 8 are The feeding rolls 15 and 15 are stopped to automatically stop the flow of grain from the drying passages 8 and 8 to the grain extracting tank 4. Grain pressure sensor 26
Is, for example, a switch operated by grain pressure, a pressure-sensitive resistance element, or the like.

In the far-infrared ray-using grain dryer configured as described above, the grains that are put into the grain storage tank 2 and stored therein are dried in the drying passages 8 and 8 of the ventilation drying unit 3 by the rotation of the feeding rolls 15 and 15. Through the grain take-out tank 4, through the grain carry-out conveyor 5, the elevator 7, and the grain distributing conveyor 6, and circulates and flows in the path of the grain storage tank 2. Then, in the ventilation drying unit 3, in the process of flowing down the drying passages 8 and 8, it is dried by ventilation by the hot air flowing from the hot air supply cylinder 9 across the drying passages 8 and 8 to the exhaust cylinder 14.

On the other hand, the grains flowing down from the drying passages 8, 8 of the ventilation drying unit 3 into the grain extracting tank 4 by the rotation of the feeding rolls 15, 15 are scattered or thin layer on the surfaces of the grain plates 17, 17. The far-infrared rays emitted from the far-infrared radiators 21 and 22 are evenly distributed to the grain flowing down on the planes of the grain shedding boards 17 and 17, while exhibiting the state and flowing into the transport gutter 16 of the grain carry-out conveyor 5. Since the grains are irradiated and far-infrared dried, the grain is efficiently and evenly dried by ventilation drying and far-infrared drying.

The grain take-out tank 4 slopes from both sides of the upper part thereof to the transport gutter 16 of the grain carry-out conveyor 5 and the flow grain board 1
7 and 17 and the side walls 18 and 18 are surrounded, the grain board 17 and 17 and the side walls 18 and 18 are heat insulating materials 1.
Since the reflecting plate 20 is laminated on the surface of the heat insulating material 19, the heat emitted from the far infrared radiators 21 and 22 in the grain extracting tank 4 is prevented from being dissipated to the outside. Therefore, the efficiency of drying the grain by far infrared rays in the grain extraction tank 4 is significantly improved, the heat energy is effectively used, and the grain is uniformly dried by far infrared rays by eliminating the uneven temperature distribution in the grain extraction tank 4. Further equalization can be achieved.

Further, the transport gutter 16 of the grain unloading conveyor 5 provided at the lower part of the grain unloading tank 4 is configured to have a capacity larger than the capacity for receiving the amount of grain in a normal transport state, and moreover, the transport gutter of the grain unloading conveyor 5 is provided. Since the reflection plate 24 that covers the upper surface of the grain 16 is provided, even if the grain conveyor 5 is stopped as in the case of a power failure during grain drying, the grain that has already flowed into the grain extraction tank 4 will be lost. Are all housed in the transport gutter 16 of the grain raising conveyor 5, and the far-infrared rays emitted from the far-infrared radiators 21 and 22 are shielded by the reflecting plate 24 on the upper surface thereof. Therefore, even if the far-infrared radiators 21 and 22 continue to radiate far-infrared rays due to combustion of fuel, the grain extraction tank 4
The grain does not fall into the over-dried state or the cracked state, and a fire can be prevented.

Further, since the grain pressure sensor 26 is provided in the transport gutter 16 of the grain carrying-out conveyor 5, when the transmission system of the grain carrying-out conveyor 5, the elevator 7 or the like is loosened or broken, for example, Even when the grain carrying-out conveyor 5 is stopped due to such an abnormality, the grain pressure sensor 26 senses an abnormal increase in grain pressure in the transport gutter 16 at that time, whereby the burner 10 is stopped and the draft drying section 3 is stopped. In addition to automatically stopping the ventilation drying in, the rotation of the feeding rolls 15 and 15 in the drying passages 8 and 8 is automatically stopped to stop the flow of the grain from the drying passages 8 and 8 to the grain extracting tank 4 and further to the far infrared rays. Since the combustion of the fuel that radiates far infrared rays from the radiators 21 and 22 is stopped, over-drying of grains in the ventilation drying section 3, cracking of the barrel, fire, and over-drying of grains in the grain extracting tank 4 are performed. It is possible to prevent the body cracks, the occurrence of the fire together in advance.

[0021]

According to the present invention, by providing a far-infrared radiator in the grain extraction tank in which grains flowing down the ventilation drying section flow in a dispersed or thin layer state, far-infrared rays are radiated to the circulating grain. By evenly irradiating, you can efficiently and evenly dry grains without causing uneven drying.

With the structure described in claim 1, heat energy is prevented from being radiated to the outside in the grain extraction tank for irradiating the grain with far infrared rays to dry the grains with far infrared rays, and the grains are radiated by far infrared rays. The drying efficiency can be further improved.

Further, by adopting the structure described in claim 2, as in the event of a power failure during the drying of the grain,
Even if the grain conveyor is stopped, all the grains that have already flowed into the grain take-out tank are stored in the conveyor gutter of the grain extraction conveyor, and the far-infrared radiation from the far-infrared radiator is shielded by the reflector on the top surface. Thus, it is possible to prevent the grain from being overdried, cracked, or even fired.

Further, by adopting the structure described in claim 3, in a transmission system such as a grain carrying-out conveyor or an elevator,
Even if the grain unloading conveyor stops due to an abnormality such as when the power transmission belt becomes loose or broken, the grain pressure sensor detects an abnormal increase in grain pressure in the transport gutter, and far infrared radiation is emitted. Far-infrared radiation from the body is automatically stopped, and the flow of grain from the drying passage to the grain extraction tank is automatically stopped, resulting in overdrying of the grain in the ventilation drying section, cracking of the barrel, fire, and in the grain extraction tank. It is possible to prevent over-drying of grain, cracking of the barrel, and fire.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional front view of a grain dryer using far infrared rays.

FIG. 2 is a side view showing a part of FIG.

FIG. 3 is an enlarged vertical sectional front view of a main part.

[Explanation of symbols]

 1 Dryer Main Body 2 Grain Storage Tank 3 Ventilation Drying Part 4 Grain Extracting Tank 5 Grain Carrying Conveyor 6 Grain Conveyor 7 Elevator 8,8 Drying Passage 9 Hot Air Supply Cylinder 10 Burner 11 Hot Air Supply Chamber 12 Exhaust Cylinder 13 Suction and Discharge Machine 14 Exhaust chamber 15,15 Feeding roll 16 Conveyor gutter 17,17 Grain board 18,18 Both side walls 19 Insulating material 20 Reflector 21,22 Far-infrared radiator 23 Reflector 24 Reflector 25 Grain inflow path 26 Grain pressure sensor

Claims (3)

[Claims] 1. A grain storage tank is provided in the upper stage of the dryer main body, a ventilation drying section is provided in the middle stage, and a grain extraction tank is provided in the lower stage, and the ventilation drying section, grain extraction tank, and grain storage tank of the grains stored in the grain storage tank are provided. A far-infrared radiator that irradiates far-infrared rays to grains that fall from the ventilation-drying unit in the grain-drying unit in the air-drying unit in the form of particles dispersed or in a thin layer in a grain dryer that circulates and circulates in a route to dry-air in the ventilation-drying unit. The far-infrared grain drying machine is characterized in that the wall surface forming the grain extraction tank has a heat insulating structure. 2. A grain storage tank is provided in the upper stage of the dryer main body, a ventilation drying section is provided in the middle stage, and a grain extraction tank is provided in the lower stage, and the ventilation drying section, grain extraction tank, and grain storage tank of the grain stored in the grain storage tank are provided. A far-infrared radiator that irradiates far-infrared rays to grains that fall from the ventilation-drying unit in the grain-drying unit in the air-drying unit in the form of particles dispersed or in a thin layer in a grain dryer that circulates and circulates in a route to dry-air in the ventilation-drying unit. The far-infrared ray-using grain dryer is characterized in that a reflecting plate for shielding far-infrared rays is provided on the grain-carrying-out conveyor provided at the bottom of the grain-taking tank. 3. A grain storage tank is provided in the upper stage of the dryer main body, a ventilation drying section is provided in the middle stage, and a grain extraction tank is provided in the lower stage, and the ventilation drying section, grain extraction tank, and grain storage tank of the grains stored in the grain storage tank are provided. A far-infrared radiator that irradiates far-infrared rays to grains that fall from the ventilation-drying unit in the grain-drying unit in the air-drying unit in the form of particles dispersed or in a thin layer in a grain dryer that circulates and circulates in a route to dry-air in the ventilation-drying unit. A grain pressure sensor is provided in the transport gutter of the grain unloading conveyor provided at the bottom of the grain unloading tank to automatically stop the far-infrared radiation from the far-infrared radiator when an abnormal grain pressure is detected, and from the ventilation drying section. A far-infrared ray-using grain dryer characterized by automatically stopping the flow of grain.