JP3811694B2 - Grain dryer - Google Patents

Description

  The present invention relates to a grain dryer that dries grains while circulating in the machine, and more particularly to an improvement of the heating device.

  In the circulation type grain dryer, the grain flow passage formed in the ventilation structure is connected to the bottom of the tempering chamber at the top of the machine body, and the hot air of the burner is crossed by this to blow the hot wind on the grain flowing down. And the grain which came out from the flow-down passage is collected in the cereal collection room of the bottom of the machine body, this is returned to the tempering room, and it flows down the flow-down passage again and is exposed to hot air.

  Thus, the inside of the machine is repeatedly circulated and dried, but the circulating grain is heated only when it flows down the grain flow passage and is not heated otherwise. Hot air also crosses the grain flow passage directly from the burner and is then released outside the machine. For this reason, there was a problem that efficiency was bad and drying time was long.

  Therefore, the inventors of the present invention have installed a heat radiation pipe having a far-infrared radiator on the outer periphery in the cereal collection room, and supplied hot air from the burner through this heat radiation pipe, so that The thing which irradiates infrared rays was proposed (Japanese Patent Application No. 7-297831).

  According to this, the grain is heated not only when flowing down the downflow passage, but also in the collection room, and the heat of the burner can be used effectively, so that the quality and efficiency of drying can be improved as compared with the prior art. .

  However, in this case, the grain that has fallen from the downflow passage to the cerealing room is immediately sent to the tempering room, and the time for staying in the cerealing room is short. There has been a problem that the infrared drying effect has not yet been utilized.

  Therefore, the present invention has been made for the purpose of improving the efficiency and quality of drying by sufficiently effectively using far infrared rays from a heat radiating tube.

In order to achieve the above-mentioned object, a grain flow passage with a ventilation structure is connected to the tempering chamber, a hot air chamber and a discharge chamber are provided across the grain flow passage,
The grain flow passage is communicated with a grain collection room provided at the lower part of the machine body, and a feed valve for discharging the grains in the grain flow passage to the grain collection room is provided,
A far-infrared radiator is provided at the center in the left-right direction of the grain collection room,
Forming the cereal collection board forming the cereal collection chamber so that the gradient of the lower part of the cereal collection board is less than the upper part of the cereal collection board;
Below the feeding valve, a drift cereal board is provided, and the grains discharged from the feeding valve are dropped onto the cereal collection board via the drift cereal board,
Furthermore, the low inclined tip of the drift cereal board is made to approach toward the upper part of the cereal collection board.

According to the present invention, the grain collecting plate forming the harvesting chamber is formed so that the gradient of the lower part of the collecting board is lower than that of the upper part of the collecting board. Thus, the irradiation time of far infrared rays can be lengthened.
In addition, the grain discharged from the feeding valve is dropped onto the upper part of the collecting board through the drifting board, and coupled with the flow down on the collecting board over a wide range, the far-infrared rays are sufficiently irradiated to the grain. it can.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front sectional view of a grain dryer embodying the present invention, and FIG. 2 is a side view showing a part thereof in section.
A tempering chamber 2 is provided at the top of the machine body 1.
A pair of left and right inclined plates 3 and three flow regulating chevron shapes 14 are provided at the bottom of the tempering chamber 2 to form four inverted cross-shaped cereal parts 5, and the grain lowering passage 4 is formed at each lower end opening. Connect.
The grain flow down passage 4 has parallel left and right side walls formed by a perforated plate 17, and a drop port at the lower end thereof is connected to a cereal collection chamber 6 provided at the lower part of the machine body 1. A feeding valve 7 is installed at each drop opening. A large number of small holes are drilled in the perforated plate 17 to impart air permeability to the grain flow passage 4.
Of the spaces partitioned by the four grain flow passages 4, the center is the first exhaust chamber 9a, and the outside is the second exhaust chamber 9b and the third exhaust chamber 9c. The grain flow passage 4 is sandwiched between the first hot air chamber 8a and the second hot air chamber 8b and the exhaust air chambers 9a, 9b and 9c in the remaining space.
Accordingly, the hot air crosses the two left and right grain flow passages 4 from the first hot air chamber 8a to the first exhaust air chamber 9a and the second exhaust air chamber 9b. The hot air chamber 8b is formed so as to be able to ventilate the first and third exhaust chambers 9a and 9c across the two left and right grain flow passages 4b.
These exhaust chambers 9a, 9b, and 9c are connected to a suction fan 11 (see FIG. 2) on the back of the machine body.

Reference numeral 18 denotes a heat radiating pipe, which is installed horizontally in the center of the cereal collection chamber 6, and a burner 10 on the front of the machine body is connected to the start end. The heat radiating pipe 18 is folded back in a U shape in the cerealing chamber 6, and the end of the radiating tube 18 rises upward through the front of the cerealing chamber and is connected to the hot air chambers 8 a and 8 b, respectively.
As shown in FIG. 3, the heat radiating pipe 18 has a double pipe structure in which a predetermined range from the connection portion with the burner 10 is covered with an outer pipe, and a far-infrared paint (for example, Okitsumo stock) Company B-600) is painted to form a far-infrared radiator.
At the bottom of the trough-shaped grain collecting plate 23 constituting the grain collecting room 6, a grain collecting spiral 15 extending in the front-rear direction is provided, and its delivery end is connected to the lower entrance of the lift elevator 16, and the top of the lift elevator 16. The outlet is connected to the beginning of the grain feeding helix 12 of the tempering room 2. A diffusing plate 13 is attached to the grain feeder at the end of the grain feeder 12.
As a result, the circulation route of the grain returning from the tempering room 2 to the tempering room 2 through the grain flow passage 4 and from the cerealing room 6 through the cereal collecting spiral 15, the rising elevator 16, and the cereal feeding spiral 12 Form.

FIG. 4 is an enlarged cross-sectional view of a reference example in the grain collection chamber 6.
Under the feeding valve 7, a cover plate 22 and a drifted cereal plate 21 inclined in a bowl shape are provided on both side edges thereof, thereby covering the upper side of the heat radiating pipe 18, and collecting the lower inclined lower end of the shed plate 21. It is made to approach toward the upper part of the grain board 23.
Reference numeral 25 denotes a blower of the burner 10, and 26 denotes a protective cover frame of the heat radiating pipe 18.

The operation of the grain dryer configured as described above will be described.
Grains are supplied to the tempering room 2 by the ascending elevator 16 and the cereal supply spiral 12, and are spread widely in the tempering room 2 by the diffusion plate 13. The grain fills the grain flow passage 4 and reaches the feeding valve 7.
In this state, the burner 10 is combusted, hot air is sent to the heat radiating pipe 18 by the blower 25, the double pipe portion 19 of the heat radiating pipe 18 is heated by the hot air of the burner 10, and the grain collecting chamber is made from the far-infrared paint coated on the outer periphery. 6 emits far infrared rays. Further, the double pipe portion 19 prevents overheating of the portion close to the burner 10.
The hot air that has heated the double pipe portion 19 continues to heat the heat radiating pipe 18 that is folded back in a U shape, and is supplied from the tip to the first hot air chamber 8a and the second hot air chamber 8b.
Then, the first hot air chamber 8a crosses the grain flow passage 4 to the first exhaust air chamber 9a and the second exhaust air chamber 9b, and the second hot air chamber 8b crosses the grain flow passage 4 Thus, the first exhaust chamber 9a and the third exhaust chamber 9c are reached and discharged from the exhaust chamber by the suction fan 11 from these exhaust chambers.
When traversing the grain flow passage 4, the surface layer portion is dried by passing between the grains descending the grain flow passage 4.

Although the surface temperature of the heat radiating pipe 18 is lowered by the amount of heat radiation as the distance from the burner 10 increases, the overall shape is folded back into a U shape, and the tip 18a returns to the connection portion with the burner 10; The surface temperature in the longitudinal direction of the entire 18 is averaged, and the amount of far-infrared radiation becomes substantially uniform.
The grain descending the grain flow down passage 4 is discharged onto the drifting grain plate 21 by the feeding valve 7 and falls to the upper part of the grain collecting board 23 along the inclination of the drifting grain board 21. It passes along the gap of the plate 23 and descends along the gradient of the grain collecting plate 23. At this time, the descending grain is uniformly exposed to the far infrared rays of the heat radiating tube 18. The grain is heated uniformly by penetration of far-infrared rays, moisture contained in the grain moves to the surface, speeds drying of the grain, and suppresses the occurrence of defects such as shrinkage and torso cracking.

The grains that have fallen into the collection room 6 gather at the bottom of the collection board 23, are sent forward by the collection helix 15, are transferred to the ascending elevator 16, rise, and are fed at the upper end of the ascending elevator 16. 12, and returned to the upper part of the tempering chamber 2. Thereafter, the inside of the machine is repeatedly circulated until the grain reaches a moisture content suitable for storage (eg, 12 to 14%).
In this way, the grain that has flowed into the grain collection chamber 6 from the grain flow down passage 4 slides down on the grain collection plate 23 to the bottom of the valley and is transferred to the lift elevator 16 until the far infrared rays of the heat radiating pipe 18 are moved. However, in this embodiment, the grain is guided by the drifting grain board 21 and falls on the upper part of the grain collecting board 23, so that the distance of sliding down the grain collecting board 23 is long. Therefore, since the irradiation time of far infrared rays becomes longer compared with the case where there is no drifting grain plate 21 and falls directly from the grain flow passage, the drying effect of far infrared rays can be used effectively. Moreover, since the grains are diffused widely on the plate surface of the grain collection board 23 by the drift grain board 21, far-infrared rays are irradiated on average and there is no unevenness in drying.

FIG. 5 shows an embodiment of the present invention.
The slope between the upper and lower parts of the grain collecting plate 23 is bent so that the gradient of the grain collecting lower part 23b is formed more loosely than the upper part of the grain collecting board 23a, and the lower end of the drifting grain plate 21 is made to look into the upper part of the collecting plate 23a.
Reference numeral 24 denotes the bent portion.
Thus, if the gradient of the grain collection board lower part 23b is formed loosely, the flow-down speed of the grain can be slowed and the irradiation time of far infrared rays can be further increased.

  It is possible to improve the efficiency and quality of drying of a grain dryer that dries the grain while circulating in the machine by making full use of far infrared rays from the heat radiating tube.

It is front sectional drawing of the grain dryer of this invention. It is a side view which shows a part same as the above in cross section. It is a top view of the heat radiating tube of this invention. It is an expanded sectional view of the reference example of the grain collection room of this invention. It is an expanded sectional view of an example of the grain collection room of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airframe 2 Conditioning room 3 Inclined plate 4 Grain flow down passage 5 Grain part 6 Grain collection room 7 Feeding valve 8 Hot air chamber 9 Ventilation chamber 10 Burner 11 Suction fan 12 Grain spiral 13 Diffusion plate 14 Flow regulation mountain shape 15 Collection Grain spiral 16 Elevator 17 Perforated plate 18 Radiator tube 19 Double tube part 20 Radiator part 21 Grain plate 22 Cover plate 23 Grain collecting plate 24 Bending part 25 Blower 26 Protective cover frame

Claims (1)

A grain flow passage with a ventilation structure is connected to the tempering room, and a hot air chamber and a discharge chamber are provided across the grain flow passage,
The grain flow passage is communicated with a grain collection room provided at the lower part of the machine body, and a feed valve for discharging the grains in the grain flow passage to the grain collection room is provided,
A far-infrared radiator is provided at the center in the left-right direction of the grain collection room,
Forming the cereal collection board forming the cereal collection chamber so that the gradient of the lower part of the cereal collection board is less than the upper part of the cereal collection board;
Below the feeding valve, a drift cereal board is provided, and the grains discharged from the feeding valve are dropped onto the cereal collection board via the drift cereal board,
Furthermore, the grain dryer which makes the low-tilt tip of the said drift grain board approach toward the upper part of a grain collection board.

Images