JP4273984B2 - Grain dryer - Google Patents

Description

The present invention relates to grain dryers.

  In the circulation type grain dryer, a cylindrical feeding valve is provided to feed the grain while rotating forward and backward at the lower end joining part of the left and right grain flow passages of the drying chamber, and the left and right peripheral surfaces of the feed valve and the left and right grain flow passages A left and right gap is formed between the lower end and a seal holding frame having a concave cross section is supported on the side wall of the machine frame below the lower ends of the left and right grain flow passages. Is known that attaches a seal slidably facing the feeding valve and opens and closes the seal holding frame to open and close the left and right gaps between the seal of the seal holding frame and the feeding valve (for example, Patent Documents). 1).

Further, in a circulation type grain dryer, it is known that the seal holding frame is configured to be removed from the opening on the side wall of the machine frame in the left-right direction or the front-rear direction (for example, Patent Document 2).
Japanese Utility Model Publication No. 1-1580 Japanese Patent No. 3351616

  The conventional feeding valve sealing device is configured to open and close the left and right gaps in order to process residual particles, and the seal supported by the seal holding frame body is properly slid with respect to the feeding valve. It was difficult to adjust to the contact state, and there was a problem that the grains leaked when the seal was worn. Therefore, the present invention is intended to solve such a problem.

In order to solve the above problems, the present invention has taken the following technical means.
The invention described in claim 1 includes an upper storage tank (2) , an intermediate drying chamber (3) , a cereal collection chamber (4) for collecting grains that are in the lower portion and have undergone a drying action, and cereal collection. In the grain dryer comprising circulation transfer means (25, 30, 31) such as an elevator (30) for returning the grains collected in the chamber (4) to the storage tank (2) , the right and left sides of the drying chamber (3) the lower converging portion cylindrical feeding valve for feeding the grains while reverse rotation to lower portion of the grain flow-down passage (5,5) (7) provided,該繰out lateral peripheral surface and the left and right grain flow-down of the valve (7) between the lower end portion of the passageway (5,5) constitute the left and right gaps (67), and the feeding valve lower part be provided below the right and left of grain flow-down passage (5,5) (7 the feeding to the axis of the valve (7) to the machine frame side wall opposing the seal support frame (68) on the left and right sides site) Unohana support shaft (73a, 73b) as well as rotatably supported by, the inside portion of the seal support frame (68) is attached a seal (69) for sliding contact faces the feeding to the valve (7) and seal (69) A gap adjusting means (A) for adjusting the distance between the feeding valve (7) and the support shaft (73a, 73b ) is provided on the outer side of the machine frame side wall , and the seal holding frame body is provided. An inspection window (81) that can be opened and closed is provided in the vicinity of the shaft support portion of (68) and corresponding to the air discharge chamber (16) of the drying chamber (3), and the seal holding frame body that is removed from the support shaft (73a) ( 68) and the seal (69) are configured to be removable from the inspection window (81) to obtain a grain dryer .

  According to the above configuration, while the grains accumulated in the upper storage tank 2 flow down the left and right grain flow passages 5 and 5 of the drying chamber 3, the right and left exhaust air chambers from the hot air chamber 3 at the center of the drying chamber 3. 16 is dried by hot air flowing in the air. Grains that have flowed down and joined to the lower ends of the left and right grain flow passages 5 and 5 are fed out by a feed valve 7 that repeats forward rotation or reverse rotation, and are accumulated in the lower cereal collection chamber 4 to circulate and transfer means 25, 30, 31. Is transferred to the storage tank 2 by whipping.

  Further, in the feeding valve 7 provided below the lower end joining portion of the right and left grain flow passages 5 and 5 in the drying chamber 3, a seal holding frame body 68 supported by support shafts 73a and 73b on the machine frame side wall. The left and right gaps 67 formed between the left and right peripheral surfaces of the feeding valve 7 and the lower ends of the left and right grain flow passages 5 and 5 are sealed. The degree of sliding contact between the seal 69 and the feeding valve 7 can be adjusted to near and far by the gap adjusting means.

Further, the seal holding frame body 68 and the seal 69 removed from the support shaft 73a are configured to be openable and closable configured in a portion near the shaft support portion of the seal holding frame body 68 on the side wall of the machine frame and corresponding to the air exhaust chamber 16 of the drying chamber 3. The inspection window 81 can be extracted.

  According to the first aspect of the present invention, the gap between the seal 69 attached to the inner side of the seal holding frame 68 and the feeding valve 7 is adjusted to the distance by the gap adjusting means, and the sliding contact of the seal 69 to the feeding valve 7 is achieved. Since the degree can be adjusted, even if the seal 69 is worn, the degree of sliding contact with the feeding valve 7 can be optimized and the durability can be improved.

Further, the seal holding frame body 68 and the seal 69 removed from the support shaft 73a can be extracted from the inspection window 81, and the maintainability of the feeding valve 7 can be improved.

(Example 1)
An embodiment of the present invention will be described below with reference to the drawings.
First, the whole structure of the grain dryer which comprises this invention is demonstrated. Reference numeral 1 denotes a machine frame of a grain dryer, in which a storage tank 2, a drying room 3, and a grain collection room 4 are stacked in this order. In the drying chamber 3, inclined grain flow passages 5, 5 are formed with the air-permeable mesh bodies 5 a, 5 a facing left and right, and a pair of left and right grain flow passages 5, 5 are formed in a V shape in front view. is doing. The upper side of each grain flow passage 5, 5 further forms a diamond-shaped space inside the left and right grain flow passages 5, 5 so as to form a V shape, and this space is formed in the hot air chamber 6. . In addition, the lower half part of the space forming body having a rhombus cross section is constituted by a ventilation net body, and the V-shaped upper half part is constituted by a non-breathable plate material.

  A feeding valve 7 is provided below the left and right junctions at the lower ends of the grain flow passages 5 and 5. The feeding valve 7 is formed in a cylindrical body having a circular cross section. The feeding valve 7 receives grains from an inlet port formed in a part of the outer periphery with forward rotation and reverse rotation, and the lower cereal collection chamber 4 according to forward and reverse rotation. It is the structure which makes it fall.

  In the hot air chamber 6 formed in the rhombus space inside the drying chamber 3, a far-infrared radiator 10 is formed in a polygonal cylindrical shape and has a length extending from the front side wall to the rear side wall of the drying chamber 3. And is detachably fixed to the front and rear surfaces of the machine wall. The far-infrared radiator 10 has a substantially hexagonal cross section that connects the inverted V-shape of the upper portion and the V-shape of the lower portion with a short vertical portion so as to correspond to the cross-sectional shape of the rhombus space portion. The upper protrusion and the lower protrusion are formed with slit-like openings 11 and 12 at the front and rear, and the left half and the right half are substantially opposed to each other with a predetermined gap therebetween. (See FIG. 3). The left and right half parts are attached to the front and rear walls with bolts and nuts attached to the front wall with a locking tool 26 that straddles the front upper part of the left and right half parts, and the left and right half parts on the front side. The lower and rear upper and lower portions are independently fixed to the front and rear walls by means of locking members 27 and 27 so as to be detachable by bolts and nuts.

  The far-infrared radiator 10 is configured to receive hot air from a burner 13 disposed in front of the dryer on the inlet side. That is, for example, a burner wind tunnel 14 having a vaporization type burner 13 disposed at the center is attached to the front wall of the machine body, and the burner wind tunnel 14 and the entrance of the far-infrared radiator 10 are communicated.

  A suction fan 15 is provided on the back side of the machine body, and is formed outside the grain flow passages 5 and 5 from the hot air chamber 6 which is a rhombus space through the grain flow passages 5 and 5 by the wind of the suction fan 15. It is comprised so that it may ventilate toward the exhaust path 16,16.

  The cereal collection chamber 4 is provided with a lower transport device 25 having a transfer spiral at the center thereof, and the grain fed from the feeding valve 7 is received by the lower transport device 25 and transferred to, for example, the front side of the machine body. An elevator 30 is provided on the front side of the machine body, and includes buckets 30a,..., And is configured to scoop up grains from the lower transfer device 25 and to cereal at the start end of the upper transfer device 31 provided on the upper ceiling. is doing. A hanging shaft 32 is provided at the center of the ceiling on the terminal end side of the upper conveying device 31 provided with the transfer spiral, and a rotating diffusion plate 33 is attached to the hanging shaft 32.

  Further, as shown in FIG. 6, an inlet wind tunnel 36 formed with outside air introduction slits 36 a,... Is formed in front of the machine wall so as to surround the burner wind tunnel 14. A controller (control unit) 40 is provided. A controller 40 operation panel 41 is provided in front of the inlet wind tunnel 36. The operation panel 41 includes a tension switch 42, a ventilation switch 43, a drying switch 44, a discharge switch 45, and a stop switch 46. The switch group is used to switch to various operation modes and to stop the operation. Moreover, if the emergency switch 47 is provided and this emergency switch 47 is operated, the whole body operation part can be stopped substantially simultaneously.

  In addition to these switches 42 to 47, a tension amount setting switch 48 for setting the tension amount, a moisture setting switch 49 for setting the final finishing moisture value, and a drying setting switch 50 (drying speed in the case of drought drying) Is set to fast, normal, and slow, and in the case of other grain drying, for example, a drying speed set in advance in association with varieties such as wheat and barley is set. Furthermore, timer increase / decrease switches 51 and 52 are provided for drying the finished product according to the processing time without depending on the moisture value.

  The moisture detection means 53 (shown in FIG. 1) employs a single-grain moisture meter, measures the moisture value in units of a predetermined number of grains every predetermined time, and calculates the moisture value by averaging the detection results for a predetermined number of times. In this configuration, the detected hot air temperature and the like are alternately displayed on the display unit 54 of the operation panel 41. In addition, the control unit 40 is configured to be able to determine the variation in moisture from the moisture value of one grain or to determine the number of immature grains, and these are displayed by three LEDs 55 and 56.

  In addition to inputting drying information and the like from the switch of the operation panel 41 to the control unit 40, detection information is input from various sensors to control the fuel supply amount of the vaporizing burner 13 and to provide a grain transfer system means. It is configured to control operation.

Next, the operation of the above configuration will be described.
The grain thrown into the tension hopper (not shown) is stretched into the storage tank 2 via the elevator 30, the upper transport device 32, etc. that are driven by turning on the tension switch (not shown). When the squeezing of the grain is completed, the process proceeds to a drying operation. In the previous stage, the setting of the grain type and the desired dry finish moisture value are set by the moisture setting switch 49 and the drying setting switch 50.

  When the drying switch 44 is turned on after the setting operation is completed, the elevator 30, the upper / lower transfer devices 25 and 31, the feeding valve 7, and the like are started, and the burner 13 is also driven so that the hot air flows into the drying chamber 3. It is supplied toward the entrance of the hot air chamber 6 which is a rhombus space.

  Here, the flame of the burner is hot-aired by the rotation of the suction fan 15, flows into the far-infrared radiator 10 while being mixed with the outside air introduced as appropriate, and heats the far-infrared radiator 10 to the upper and lower parts. It flows out of the far-infrared radiator 10 through the slit-shaped openings 11,. At that time, far-infrared rays are emitted from the surface of the far-infrared radiator 10 by the heating of the far-infrared radiator 10, and both the thermal radiation and the hot air act on the grains flowing down through the flow-down passages 5 and 5, Moisture transfer inside the grain is promoted by radiant heat and hot air by infrared rays, and an efficient drying action is performed along with the water removing action by the hot air.

  Far-infrared radiation and hot air are dried over the grain flow passages 5 and 5, and the hot air passing through the grain flow passages 5 and 5 is exhausted through the exhaust chambers 16 and 16. The grain dried in the drying chamber 3 is returned again to the storage tank 2 via the lower transfer device 25, the elevator 30 and the upper transfer spiral 31 of the cereal collection chamber 4, and undergoes a tempering action. Such a process is repeated and drying is completed when a predetermined moisture value is reached.

  In the embodiment shown in FIG. 3, since the cross-sectional shape of the far-infrared radiator 10 is configured so as to substantially follow the cross-sectional shape of the cereal flow passages 5 and 5, the far-infrared radiation from the far-infrared radiator 10 flows down the grain. Can be applied equally.

  Further, in the embodiment shown in FIG. 3, the far-infrared radiators 10, 10 are configured in a bilaterally symmetric shape, and the slit-shaped openings 11, 12 are configured by arranging the hot air chamber 6 with a space in the vertical direction. Hot air flows out from both the upper and lower surfaces, and overheating of the far-infrared radiators 10, 10 can be prevented.

  Moreover, as shown in FIG. 4, the slit-shaped opening part 11 is formed only in one upper part of the far-infrared radiator 10, and the lower side of the far-infrared radiator 10 is exclusively blown by hot air from the burner without exhausting hot air. You may comprise so that the heating of this may be accelerated | stimulated. A dust prevention shielding member 28 may be provided to optimize the temperature distribution in the hot air chamber 6.

  Further, as shown in FIG. 5, a slit-like lower opening 12 is formed only on the lower side of the far-infrared radiator 10 and hot air is not exhausted on the upper side, and the far-infrared radiator 10 is exclusively produced by the burner hot air. You may comprise so that the heating of the upper side of may be accelerated | stimulated.

  Moreover, you may arrange | position the far-infrared radiator 10 in the hot air chamber 6 as shown in FIG. That is, the rear side portion of the far-infrared radiator 10 is closed with the lid 61, and the far-infrared radiator 10 is attached to the rear side wall 62 of the machine frame 1 with a metal fitting at a distance. And the hot air temperature sensor 63 and the exhaust air temperature sensor 64 are attached to the left and right above the rear end part of the far-infrared radiator 10. Further, as shown in FIG. 8, when the attachment pieces 61a and 61a are integrally formed on both the left and right sides of the lid 61 by pressing, the lid 61 can be firmly attached to the far-infrared radiator 10 while reducing the number of parts. it can.

  As described above, since the predetermined interval is provided between the far-infrared radiator 10 and the rear side wall 62, the temperature of the rear side portion of the hot air chamber 6 does not become excessively high, and the hot air temperature sensor 63. And the detection temperature of the exhaust air temperature sensor 64 can be optimized.

  Further, as shown in FIG. 9, a slit 65 may be provided below a corresponding portion of the rear side portion of the far-infrared radiator 10 on the rear side wall 62. With this configuration, excessive temperature rise at the rear end of the hot air chamber 6 can be prevented by sucking outside air from the slit 65 and the temperature distribution can be equalized. The hot air temperature sensor 63 and the exhaust air temperature sensor 64 can Appropriate temperature detection can be performed.

  Moreover, you may comprise the far-infrared radiator 10 with a thermal radiation steel plate. Compared with the case where a far-infrared radiation paint is applied to a heat-resistant steel plate or the like, the process can be omitted, and the cost in assembly production can be reduced.

  Moreover, as shown in FIG. 10, the lower side part of the far-infrared radiator 10 may be in a closed state, and the opening 66 may be configured only on the front side part of the upper side part. By providing the opening 66 only in the front side near the burner 13, the temperature of the front side of the far-infrared radiator 10 increases, and the temperature distribution before and after the hot air chamber 6 can be equalized. That is, the inlet side near the burner tends not to be affected by the flame so much that hot air tends to flow to the rear side, and the temperature at the hot air chamber inlet side tends to be low. 66 is provided to make the temperature distribution uniform.

In addition, the far-infrared radiator 10 in FIG. 10 is configured to ensure strength by connecting lower slit portions at appropriate intervals.
Moreover, as shown in FIG. 11, the far-infrared radiator 10 is arranged at the center of the hot air chamber 6, and the distance between the left and right outer peripheral parts of the far-infrared radiator 10 and the left and right grain flow passages 5 and 5 is made equal to the left and right. May be. With this configuration, the wind speed distribution of the intake air in the hot air chamber 6 is equalized and a stable temperature distribution can be obtained. Further, the left, upper right, middle, and lower surface portions 10a, 10a, 10b, 10b, 10c, 10c of the far-infrared radiator 10 and the upper passages 5b, 5b, middle of the left and right grain flow passages 5, 5 The passages 5c, 5c and the lower passages 5d, 5d can be made to face each other, and the entire hot air chamber 6 can be evenly warmed by radiant heat.

Next, the seal configuration of the feeding valve 7 will be described with reference to FIGS.
Below the lower end joining part of the left and right grain flow passages 5 and 5, a cylindrical feeding valve 7 is provided which feeds the grain while repeating forward and reverse rotation in a cylindrical cross section. , 5 is provided with a feeding opening 7a for feeding the grain, and left and right gaps 67, 67 between the left and right peripheral surfaces of the feeding valve 7 and the lower ends of the left and right grain flow passages 5, 5 are formed. Is configured.

  Left and right seal holding frames 68, 68 having a concave cross section are disposed below the lower ends of the left and right grain flow passages 5, 5 and on both left and right sides of the feeding valve 7. That is, the outer frame body 68a formed in a U-shaped section and the inner frame body 68b fitted to the outer frame body 68a are integrally configured. Seals 69, 69 slidably facing the feeding valve 7 are detachably fixed to the inner side portions of the seal holding frames 68, 68, that is, at one corner portion of the inner frame body 68b by a bolt and nut with a pressing plate 69a. Yes. Brackets 70a and 70b are attached to both front and rear ends of the seal holding frame bodies 68 and 68, and support holes 71'a and 71'b of the front and rear side walls 71a and 71b of the machine frame 1 and support holes of the brackets 70a and 70b. The front and rear support shafts 73a and 73b are inserted into 70'a and 70'b, and the seal holding frame bodies 68 and 68 are pivotally supported on the front and rear side walls 71a and 71b (b). This pivot axis (A) is provided with an arm 74 on a support shaft 73a on the front side, and this arm 74 is configured to be rotatable along the outside of the front side wall 71a.

  Thus, when the feeding valve 7 is rotated forward and backward by forward / reverse driving means (not shown), the left and right grain flow passages while the feeding opening 7 a of the feeding valve 7 rotates above the left and right seals 69, 69. In this configuration, the grains from 5 and 5 are received in the feeding valve 7 and the inside grains are fed downward while the feeding valve 7 rotates downward from the left and right seals 69 and 69.

  When attaching the support shaft 73a with the front arm 74 to the support holes 70'a and 70'b of the brackets 70a and 70b, the support shaft 73a with the arm 74 is configured as a round bar, and the peripheral surface of the support shaft 73 A plurality of conical hole-shaped lock holes 73c,... Are configured by shifting in the rotational direction, and the tip of the lock bolt 75 screwed into the bracket 70a is selectively locked into one of the lock holes 73c,. The mounting angle of the arm 74 with respect to the holding frames 68, 68 is configured to be adjustable, and the sliding contact degree of the seal 69 with respect to the feeding valve 7 can be roughly adjusted.

  Further, bent pieces 76 and 76 are provided on the upper and lower sides of the front side wall 71a, and an adjusting bolt 78 is provided to vertically penetrate the bent pieces 76 and 76, and an adjusting body 79 is screwed onto the adjusting bolt 78 with a nut 80. ing. Reference numeral 77 denotes a locking nut which is screwed from below the bolt 78 to fix the bolt 78 between the bent pieces 76 and 76. Therefore, when the adjusting bolt 78 is rotated in the forward and reverse directions, the adjusting body 79 is configured to move up and down.

  By engaging the elongated hole 74a of the arm 74 with a bolt 80a that is screwed into the support hole 79a provided in the adjusting body 79, the arm 74 is interlocked with the vertical movement of the adjusting body 79 to rotate the support shaft 73a. It is the structure which carries out rotation interlocking | working forward and backward about an axis (a). Thus, by rotating the adjustment bolt 78, the seal holding frame body 68 can be rotated and adjusted via the arm 74 of the support shaft 73a, and the degree of sliding contact between the seal 69 and the feeding valve 7 can be finely adjusted. (Gap adjusting means A).

  A support wall 71b that penetrates and supports the support shaft 73b is formed in the wall portion on the rear side surface, and the three of the support shaft 73b, the bracket 70b, and the seal holding frame body 68 are integrated, and the assembly order is as follows. The front support shaft 73a is removed, the seal holding frame body 68 is held by mounting the support shaft 73b, and then the support shaft 73a and the gap adjusting means are assembled to the front bracket 70a.

  Further, in the vicinity of the shaft support portion of the seal holding frame 68 on the front and rear side walls 71a and 71b, that is, on the left and right outer sides of the shaft support portions of the front and rear side walls 71a and 71b and corresponding to the air discharge chamber 16 of the drying chamber 3 An inspection window 81 is provided, and the inspection window 81 can be opened and closed by an inspection lid 82.

  With this configuration, when the lock bolt 75 and the bolt 80a are loosened, the support shaft 73a is removed from the bracket 70, and the support shaft 73a is removed from the seal holding frame body 68, the seal holding frame body 68 (and the seal) 69) is only supported by the other support shaft 73b, and the long seal holding frame 68 and the seal 69 can be taken out of the machine from the inspection window 81 on the front side wall. Further, the inspection and adjustment of the seal 69 and the seal holding frame body 68 can be easily performed from the inspection window 81, and the maintainability can be improved.

Next, the body configuration of the grain dryer will be described with reference to FIGS.
The upper part of the drying machine 3 is stacked on the lower machine frame 1a with the lower part of the drying room 3 and the cereal collection room 4, and the upper part is a storage tank 2 inside the intermediate machine frame 1b. The machine frames 1c and 1c are stacked to constitute a grain dryer. The lower machine casing 1a includes a lower part of the left and right combustion chambers 6, a lower part of the grain flow passages 5 and 5, a lower part of the exhaust air chamber 16, and a cereal collection room 4. A pair of front and rear reinforcing rods 83, 83 are connected and reinforced with the frame 1a, and an insertion opening 84 is formed on the left and right sides of the grain collection chamber 4 on the front side wall 71 of the lower machine frame 1a. The upper conveying device 31, which is a long object, is attached so as to be removable in the front-rear direction.

  Then, the upper transport device 31 extracted from the upper machine casing 1c is inserted toward the rear side from the insertion opening 84 of the front side wall 71 of the lower machine casing 1a, and the reinforcing rods 83 and 83 are used to The hopper portion 31b is held upward while supporting the heel portion, and the upper end portion of the hopper portion 31b and the upper end portion of the lower machine casing 1a can be stored in a substantially aligned state. The upper transport device 31 can be connected to the lower machine casing 1a using the mounting bracket 85 that connects the two.

  Accordingly, the upper transport device 31 can be accommodated on the side of the connecting cylinder 86 to the elevator 30 of the lower transport device 25, and the transportation space can be reduced by compact packaging while sharing parts.

Next, the grain horizontal stretching device of the grain dryer will be described.
An openable laterally extending hopper (not shown) is provided on, for example, the right side wall 1d of the intermediate machine frame 1b stacked on the upper part of the lower machine frame 1a, so that grains can be stretched from the side of the machine body. A bracket 87 is attached to the lower end portion of the right grain flow passage 5, and the seal 69 and the stay 88 of the feeding valve 7 are fastened to the bracket 87 with bolts and nuts. The guide plate 89 is attached with bolts and nuts so as to be adjustable up and down (FIG. 20).

  Since it comprised as mentioned above, by adjusting the space | interval of the guide plate 89 and the grain collection room 4 suitably, aiming at the simplification of a structure, the amount of flowing-down kernels is optimized and the helix of the lower conveying apparatus 25 is adjusted. This prevents overloading and allows the grain to be smoothly stretched.

FIG. The front view which cut the whole part. The perspective view of an example of a far-infrared radiator. The perspective view of a far-infrared radiator other example. The perspective view of a far-infrared radiator and another example. The front view of an operation panel. The side view of a far-infrared radiator. The side view of a cover part, a rear view, and a top view. The rear view of the principal part. The side view of a far-infrared radiator. The front schematic diagram of the principal part. The expanded front sectional view of the principal part. The perspective view which the principal part disassembled. The disassembled perspective view of the gap adjusting mechanism. The plane sectional view of the important section. The top view which shows an upper conveying apparatus accommodation state. The side view and front view which show an upper conveying apparatus accommodation state. The enlarged front view which shows an upper conveying apparatus accommodation state. The enlarged side view which shows an upper conveying apparatus accommodation state. The expanded front sectional view of the principal part.

Explanation of symbols

1 Grain dryer frame 2 Storage tank 3 Drying chamber 4 Grain collection chamber 5 Grain flow passage 6 Hot air chamber 7 Feeding valve 7
7a Feed opening 10 Far-infrared radiator 16 Exhaust chamber 25 Lower transfer device (circulation transfer means)
30 Elevator (circulation transfer means)
31 Upper transfer device (circulation transfer means)
67 Left and right gap 68 Seal holding frame 69 Seal 73a, 73b Support shaft 73c Lock hole 74 Arm 75 Lock bolt 78 Adjustment bolt 81 Inspection window A Clearance adjustment means

Claims (1)

Upper storage tank (2) , middle drying chamber (3) , lower cereal collection chamber (4) for collecting dried grains, and cereal collected in the cereal collection chamber (4) In the grain dryer comprising circulation transfer means (25 , 30, 31) such as an elevator (30 ) for returning the rice to the storage tank (2) , the right and left grain flow passages (5, 5) in the drying chamber (3 ) while the forward reverse to the lower converging portion lower portion provided a valve (7) feeding cylindrical for feeding the grains,該繰out the lower end of the right and left peripheral surface and the left and right grain flow-down passage of the valve (7) (5,5) The left and right gaps (67) are formed between the left and right grain flow passages (5, 5) , and the seals are provided below the lower ends of the left and right grain flow passages (5, 5) and face the left and right sides of the feeding valve (7). the support shaft along the axis of the feeding valve holding frame (68) to the machine frame side walls (7) (73a, 73 ) As well as rotatably supported by, the seal holding frame body (68) the feed-out valve (7) in sliding contact face seal (69) attached to the seal (69) and the feed-out valve (7 inside portion of) A gap adjusting means (A) for adjusting the rotation of the support shafts (73a, 73b ) is provided on the outer side of the machine frame side wall .
An inspection window (81) that can be opened and closed is provided in the vicinity of the shaft support portion of the seal holding frame (68) and corresponding to the exhaust chamber (16) of the drying chamber (3), and is removed from the support shaft (73a). A grain dryer characterized in that the seal holding frame (68) and the seal (69) can be removed from the inspection window (81) .

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