JPH09178344A - Circulation type grain dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circulation type grain dryer which makes it possible to operate a grain collecting unit and scattering unit by one driver. SOLUTION: A grain tank 2 is formed substantially in a cylindrical shape. A grain dry passage 3 of annular cross section made of porous walls 11, 12 is connected to the lower end of the tank 2. An hot air chamber 6 or exhaust chamber 8 is formed inside the passage 3 so as to pass the hot air through the passage 3, and the chamber 8 or 6 is formed at the annular outside. A rotary shaft 13 coaxial with the center of the tank 2 is stood in the tank 2. A scattering unit 23 for substantially uniformly scattering the grain discharged from an upper conveyor 5 is supported to the upper part of the shaft 13, and a conveying disc 25 for conveying the grain flowing down from the passage 3 in the circumferential edge direction of the tank 2 is supported to the lower part of the shaft 13 so as to approach the lower end of the passage 3. Further, a scraping-out blade 28 for scraping up the grain in a grain collecting trough 27 annularly provided along the circumferential edge of the tank 3 to a grain lifter 4 is provided at the end edge of the disc 25.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention relates to rice
The present invention relates to a circulation type grain dryer that dries grains such as wheat while circulating them.

[0002]

2. Description of the Related Art Conventionally, as a circulating grain dryer of this type, the one disclosed in FIG. 3 is known, and, referring to FIG. 3, a grain tank 102 is provided above a machine body 101. With a ventilation structure provided at the bottom thereof
The grain drying chamber 104 provided with 03 is connected. And
As a grain circulation device, a rotary valve 106 is provided at the drop port 105 at the lower end of the grain flow passage 103, and the lower end of the grain flow passage 103 is connected to the grain collecting unit 107 at the bottom of the machine via this rotary valve 106, Further, the hot air chamber 108 and the exhaust air chamber 109 are adjacent to each other with the grain flow path 103 interposed therebetween, and a burner is connected to the hot air chamber 108 and a suction fan is connected to the exhaust air chamber 109.

Then, the rotary valve 106 is rotated to drop the grains in the grain tank 102 through the grain flow-down passage 103 to the grain-collecting section 107, which is flowed down by the grain-collecting spiral 110 and the elevator 111 as a grain-collecting device. Gutter 112
Then, it is returned to the grain tank 102 again by the upper spiral 113 and the scattering plate 114 as a scattering device and circulated in the machine. At this time, the hot air from the burner is sent to the hot air chamber 108 to pass through the porous wall of the grain flow-down passage 103 to dry the grain. The exhaust air containing moisture after passing through the grain flow-down passage 103 is sucked by the suction fan of the air exhaust chamber 109 and discharged to the outside of the machine.

[0004]

However, according to the above-mentioned conventional circulating grain dryer, the rotary valve 1 is used.
06, a motor for driving the grain-collecting spiral 110, and a motor for driving the upper spiral 113 and the scattering plate 114 are provided, so that the structure is complicated and the manufacturing cost is high due to independent driving devices. It was.

In view of the above problems, it is a technical object of the present invention to provide a circulating grain dryer capable of operating the grain collecting device and the scattering device by one driving device.

[0006]

In order to solve the above problems, the present invention relates to a grain tank for storing grains, and a grain drying process in which the grain tank is connected to a lower end of the grain tank and dried while the grains flow down. A circulation type consisting of a passage, a fried machine that circulates the grains flowing out from the grain drying passage to the grain tank, and an upper conveyance device that is connected to the fried machine and hangs above the grain tank. A grain dryer, wherein the grain tank is substantially cylindrical, and a grain drying passage having a circular cross-section having a porous wall is provided to connect to the lower end of the grain tank, and hot air passes through the grain drying passage. As described above, the inside of the annular grain drying passage is formed in the hot air chamber or the exhaust air chamber, and the annular outside is formed in the exhaust air chamber or the hot air chamber, respectively, and a rotary shaft having the tank central portion as the axis is formed in the tank. While standing upright, the upper transfer device is installed above the rotary shaft. On the lower part of the rotating shaft, a transport disk for transporting the grains discharged from the grain drying passage in the circumferential direction of the tank is mounted on the lower part of the rotating shaft while the scattering device for scattering the grains discharged from the grain in the tank almost uniformly. Is attached so as to be close to the lower end of the grain drying passage, and further, at the edge of the conveying disc, the grains in the grain collecting trough provided annularly along the peripheral edge of the tank are scraped by the frying machine. I took the technical measure of installing a scraping blade.

The transport disc may be attached to the rotary shaft via a clutch mechanism capable of transmitting or disconnecting the rotary motion of the rotary shaft.

[0008]

When the grain is stuck, the rotary shaft is rotated, for example, to the right so as not to rotate the transport disc. Then, the transport disk spins idle by the clutch mechanism, and only the scattering device that is axially attached to the rotating shaft is rotated. At this time, when the grain elevator and the upper conveying device are driven and the grains are stuck from one side of the grain elevator, the grains are fed by the grain elevator and laterally fed by the upper conveying device. It is discharged from the upper transfer device and supplied to the rotating scattering device. Then, the grains are scattered by the centrifugal force of the scattering device and uniformly deposited in the grain tank.

During grain circulation / drying, the rotary shaft is rotated counterclockwise, for example, so as to rotate the transport disc. Then, the rotating motion of the rotating shaft is transmitted to the transfer disk by the clutch mechanism, and the rotating shaft, the scattering device, and the transfer disk are rotated. At this time, when the transport disc is rotated, the grains at the lower end of the grain drying passage are transported by the centrifugal force in the peripheral direction of the tank and fall into the grain collecting trough, and the grains are scraped by the scraping blades to be lifted by the frying machine. Be transported to. Then, it is returned to the grain tank again by the lifting machine, the upper conveying device, and the scattering device to circulate the grains. At this time, the hot air is sent to the hot air chamber and passed through the dry grain passage to dry the dry grain. Exhaust air containing moisture after passing through the grain drying passage is discharged out of the machine together with dust from the air exhaust chamber.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. 1 is a vertical cross-sectional view showing an embodiment of a circulating grain dryer of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. In FIG. 1, reference numeral 1 is a machine body of a circulation type grain dryer, and a grain tank 2 for storing grains.
And a grain drying passage 3 connected to the lower end of the grain tank 2 to dry the grain while flowing down, and a grain dripping machine 4 for circulating the grain flowing out from the grain drying passage 3 to the grain tank 2.
And an upper transfer device 5 which is connected to the grain fried machine 4 and horizontally extends above the grain tank 2.

The grain tank 2 has a substantially cylindrical shape, and is connected to the lower end of the grain tank 2 and has a circular cross-section perforated wall 1
A grain drying passage 3 formed by 1 and 12 is provided (see FIG.
), The inside of the grain drying passage 3, that is, the porous wall 11
An inner space surrounded by is formed in the hot air chamber 6, and an outer space of the grain drying passage 3, that is, a space surrounded by the porous wall 12 and the side wall 7 of the machine body 1 is formed in the air exhaust chamber 8. And hot air chamber 6
Is connected to a burner 9 provided at the bottom of the machine body 1 through a perforated disk 26 described later, and the exhaust chamber 8 is connected to a suction fan 10.

In the grain tank 2, a rotary shaft 13 having a central portion of the tank 2 as an axis is provided upright. The lower part of the rotary shaft 13 is supported by a support base 14, and the rotary shaft 13 is rotatably provided by bearings 15 and 16 embedded in the support base 14 and bearings 17 and 18 provided in an intermediate portion of the rotary shaft. A pulley 19 pivotally attached to the rotary shaft 13 is provided in the inner cavity of the bottom of the support base 14, and the pulley 19 communicates with a motor pulley 22 of a motor 21 provided on the side wall 7 via a V belt 20.

On the upper part of the rotary shaft 13, a spattering device 23 for depositing the grains in the grain tank 2 almost uniformly is attached. The scattering device 23 is formed, for example, in the shape of a dish, and the grains are scattered by the centrifugal force generated by the rotation of the scattering device 23 and are uniformly deposited in the grain tank 2. At this time, it is desirable to arrange the upper transport device 5 directly above the scattering device 23 so that the grains from the upper transport device 5 are supplied to the scattering device 23.

On the other hand, at the lower part of the rotary shaft 13, since the grain flowing down from the drop port 24 at the lower end of the grain drying passage 3 is transported in the peripheral direction of the tank (toward the side wall 7), the transport disk 25 has a transport port 25. Is pivoted so as to be close to. At this time, if the transfer disk 25 is axially attached via a clutch mechanism 35 (for example, a one-way clutch) capable of transmitting or disconnecting the rotational movement of the rotating shaft 13, the transfer disk 25 can be attached at the time of extension.
Is stopped, and the transport disk 25 is rotated during circulation drying.

Further, the transport disc 25 has a structure in which the central side of the transport disc 25 is formed as a porous disc 26 with the porous wall 11 forming the hot air chamber 6 as a boundary so that the hot air of the burner 9 can pass through the hot air chamber 6. And And at the bottom of the side wall 7,
A grain collecting gutter 27 having an annular cross section along the outer peripheral edge of the tank 2 is provided. The transport disc 25 extends to the grain collecting trough 27, and a plurality of scraping blades 28 are provided at the edge of the transport disc 25 so that the grains dropped on the grain collecting trough 27 can be lifted by the frying machine 4. You can scrape it up.

The fried grain machine 4 is composed of, for example, an endless bucket conveyor provided with a large number of buckets. A grain hopper 31 is provided at the lower part of one side of the fried grain machine 4, and the fried grain machine is also provided. An opening 30 is provided in the lower part of the other side of the No. 4 and is connected to the grain collecting gutter 27 via an inclined plate 29.
On the other hand, the upper part of the fried grain machine 4 is connected to one end of the upper transfer device 5 via the downflow gutter 32, and the other end of the upper transfer device 5 is arranged directly above the scattering device 23. A discharge pipe 34 is provided below the flow-down gutter 32 via a switching valve 33 so that the grain can be circulated and discharged. Reference numeral 36 is a control box in which a control device is built in. The control device 36 has an electric signal from operation switches (none of which are shown) for sticking, circulating / drying, discharging, etc., an outside air temperature outside the machine, By inputting electrical signals from various sensors (none of which are shown) that detect the moisture of the grain, the temperature of hot air, etc., the rotation direction, rotation speed and ON / OF of the motor 22 are input.
F control and hot air temperature control of the burner 9 are performed.

Next, the operation of the above embodiment will be described.

When the grain is stuck, the control device 36 outputs a signal to the motor 21, for example, to rotate it to the right so as not to rotate the transport disk 25. Then, the rotating shaft 13 is also rotated to the right, the transport disc 25 is idled by the clutch mechanism 35, and only the scattering device 23 axially attached to the rotating shaft 13 is rotated. At this time, when the switching valve 33 is switched to the upper transfer device 5 side and the grain elevator 4 and the upper transfer device 5 are driven to stick the grain from the hopper 31 on one side of the grain elevator 4, the grain is lifted. While being lifted by the machine 4, it is laterally fed by the upper transport device 5, further discharged from the upper transport device 5 and supplied to the rotating scattering device 23. Then, the grains are scattered by the centrifugal force of the scattering device 23 and uniformly deposited in the grain tank 2.

When the circulation of the grains is completed and the circulation / drying is to be performed next, the control device 36 outputs a signal to the motor 21 to rotate the conveyor disc 25, for example, to the left. Then, the rotary shaft 13 is rotated counterclockwise and the transport disc 2 is rotated.
The rotary motion of the rotary shaft 13 is transmitted to the rotary shaft 5, and the rotary shaft 13, the scattering device 23, and the transport disk 25 are rotated. Transport disc 2
When 5 is rotated, the grains at the lower end of the grain drying passage 3 are conveyed in the circumferential direction of the tank by the centrifugal force. Then, the grains fall onto the grain collecting gutter 27, and the grains are scraped by the scraping blades 28 and conveyed to the grain lifting machine 4. Further, the grain is returned to the grain tank 2 again by the lifting machine 4, the upper conveying device 5, and the scattering device 23 and circulates in the machine.

At this time, the hot air from the burner 9 is sent to the hot air chamber 6 to pass through the porous walls 11 and 12 of the grain drying passage 3 to dry the grains. Exhaust air containing moisture after passing through the grain drying passage 3 is sucked by the suction fan 10 connected to the air exhaust chamber 8 and discharged outside the machine together with dust.

The grain is discharged by the motor 21 as in the circulation.
Is rotated counterclockwise, and further the switching valve 33 is connected to the discharge pipe 34.
When switched to the side, the grains fed by the grain lifting machine 4 are discharged from the discharge pipe 34 to the outside of the machine via the downflow gutter 32.

[0022]

As described above, according to the present invention, the grain tank has a substantially cylindrical shape, and the grain drying passage connected to the lower end of the grain tank and having a circular cross section having a porous wall is provided. The inside of the annular grain drying passage is formed in the hot air chamber or the exhaust chamber and the annular outside is formed in the exhaust chamber or the hot air chamber so that hot air can pass through the grain drying passage, and the tank central portion is formed in the tank. While the rotation shaft having the axis as a center is erected, a scattering device that scatters the grains discharged from the upper transfer device into the tank substantially evenly is attached to the upper part of the rotation shaft while the rotation device is rotated. At the lower part of the shaft, a transport disc for transporting the grain flowing down from the grain drying passage in the tank peripheral direction is axially attached so as to be close to the lower end of the grain drying passage, and further at the edge of the transport disc. The above-mentioned is used to lift the grains in the grain collecting trough provided in an annular shape along the periphery of the tank. Since the machine is equipped with a scraping blade, it is possible to operate the grain collecting device and the scattering device with one drive device, and it is necessary to operate independent drive devices for each process of sticking, circulating, drying and discharging. It has become possible to provide a circulating grain dryer that has a simple structure and is inexpensive to manufacture.

Further, since the transport disc is rotatably attached to the rotary shaft via a clutch mechanism capable of transmitting or disconnecting the rotary motion of the rotary shaft, the transport disc is stopped when the grain is stuck. It is now possible to drive only the scattering device, and it is also possible to drive the transport disk and the scattering device when circulating and drying the grain.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a circulating grain dryer of the present invention.

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

FIG. 3 is a schematic vertical sectional view showing a conventional circulation type grain dryer.

[Explanation of symbols]

 1 Airframe 2 Grain tank 3 Grain drying passage 4 Grain lifter 5 Upper transfer device 6 Hot air chamber 7 Side wall 8 Exhaust chamber 9 Burner 10 Suction fan 11 Perforated wall 12 Perforated wall 13 Rotating shaft 14 Support 15 Bearing 16 Bearing 17 Bearing 18 Bearings 19 Pulleys 20 Pulleys 21 Motors 22 Motor pulleys 23 Scattering devices 24 Drop openings 25 Conveying discs 26 Perforated discs 27 Grain gutters 28 Scraping blades 29 Inclined plates 30 Openings 31 Hoppers 32 Downflow gutters 33 Switching valves 34 Discharge pipes 35 Clutch mechanisms Control box

Claims (2)

[Claims] 1. A grain tank for storing grains, a grain drying passage connected to a lower end of the grain tank to dry the grain while allowing the grains to flow down, and a grain flowing out from the grain drying passage. What is claimed is: 1. A circulation type grain dryer comprising: a grain elevator that circulates to the grain tank; and an upper transfer device that is connected to the grain grain machine and hangs above the grain tank. In addition, a grain drying passage having a circular cross section formed of a porous wall is provided connected to the lower end of the grain tank, and a hot air chamber is provided inside the annular grain drying passage so that hot air can pass through the grain drying passage. Or, in the exhaust air chamber, an annular outside is formed in the exhaust air chamber or the hot air chamber, respectively, and a rotary shaft having a central portion of the tank as an axis is erected inside the tank, and the upper part of the rotary shaft is The grains discharged from the upper conveyor are scattered almost evenly in the tank. On the lower part of the rotating shaft, a transport disk for transporting the grains flowing down from the grain drying passage in the tank peripheral direction is attached to the lower part of the rotating shaft so as to be close to the lower end of the grain drying passage. In addition, the end of the conveyor disc is provided with a scraping blade for scraping the grain in the grain collecting trough provided in an annular shape along the peripheral edge of the tank to the fried machine. Dryer. 2. The circulation type grain dryer according to claim 1, wherein the conveyor disc is pivotally attached to the rotary shaft via a clutch mechanism capable of transmitting or disconnecting the rotary motion of the rotary shaft.