JPH04332379A - Operation control method of grain drier - Google Patents

Abstract

PURPOSE:To discharge remaining grains, dropped and discharged into a hot air drier at the lower part of a grain drier, automatically to the outside of the drier by the opening operation of an on/off valve for a cooling device at the upper part of the drier. CONSTITUTION:When no grain is detected in a cooling device 4 at the upper part of a grain drier and a hot air drier 7 at the lower part of the same, an on/off valve 3 for said cooling device 4 is opened to drop and supply remaining grains on the on/off valve 3 into said hot air drier 7 and a predetermined period of time has elapsed after the remaining grains are discharged automatically to the outside of the drier, the grain drier is controlled so as to be stopped automatically. Accordingly, the remaining dried grains of this time will never be mixed with grains to be dried next time and the remaining grains will never be dried again whereby the cracking of the remaining grains will never be generated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for a grain dryer.

0002

[Prior Art] Conventionally, there has been a cooling device that feeds grains from an upper cooling storage chamber with a closed valve at the bottom of a lower cooling collecting trough, circulates and cools the grains, and a drying storage chamber in the upper side. A hot air drying device is provided for drying the grains by blowing hot air into the drying chamber while circulating the grains from the chamber to the lower grain drying chamber, and the cooling storage chamber and the drying storage chamber A cooled grain sensor and a dry grain sensor are provided to detect the presence or absence of grains,
Both of these air-cooled and dry grain sensors
It was detected that there were no grains in the drying storage chamber, and the on-off valve was controlled from a closed state to an open state, and the remaining grains remaining on this on-off valve were dropped and supplied into the hot air drying device. Even then, the operation control system did not specifically switch to the discharge operation in order to discharge the remaining grains outside the machine.

0003

[Problems to be Solved by the Invention] Grain stored in the drying storage chamber of the hot air drying device of the grain dryer is circulated from the drying storage chamber to the grain drying chamber. The grains are dried by being exposed to hot air, and the dried grains are discharged to a cooling storage chamber of a cooling device for cooling, and the dried grain sensor detects that there are no grains in the drying storage chamber. Then, it is detected that the discharge of the grains in the drying storage chamber has been completed, and cooling of the dried grains in the cooling storage chamber is started, and while being circulated from the cooling storage chamber to the cooling collecting trough The grains are left to cool, and when the cooling is finished, the cooled grains are discharged outside the machine.
When the cooled grain sensor detects that there are no more grains in the cooled storage chamber, it is detected that the grain discharge is completed and the dryer is stopped.

[0004] The next drying is double drying, in which the on-off valve at the bottom of the cooling collecting grain trough of the cooling device is opened, and the grains are circulated and dried from the cooling device to the hot air drying device. When performing this, the on-off valve is controlled to be open, and the remaining grains that were previously left to cool and were discharged onto this on-off valve fall into the hot air drying device by the opening control of the on-off valve. The dried residual grains are mixed with the newly loaded and dried grains, which are then dried.As a result, the residual grains may be re-dried and split into shells. Furthermore, due to the sound of falling grains, new grains are inserted even though there are dried grains remaining, which can lead to loss of reliability, and this is an attempt to solve this problem. .

[0005]

[Means for Solving the Problems] The present invention provides a cooling method in which grains are fed out from an upper cooling storage chamber 1 to a lower cooling collecting trough 2 with an on-off valve 3 at the bottom closed, and the grains are circulated and cooled. Grain provided with a device 4 and a hot air drying device 7 that blows out the grains from the upper drying storage chamber 5 to the lower grain drying chamber 6 and circulates the grains while blowing hot air into the drying chamber 6 to dry the grains. In the dryer, a cooling grain sensor 8 and a drying grain sensor 9 detecting the presence or absence of grains in the cooling storage chamber 1 and the drying storage chamber 5 are connected to the cooling storage chamber 1 and the drying storage chamber 5. In addition to detecting that there are no grains inside,
When the on-off valve 3 is controlled from the closed state to the open state, the remaining grains remaining on the on-off valve 3 are dropped into the hot air drying device 7 and are controlled to be discharged outside the machine. The dryer is configured to automatically stop the dryer after a predetermined period of time has elapsed.

[0006]

Effect of the Invention The grains stored in the drying storage chamber 5 of the hot air drying device 7 of the grain dryer are circulated from the drying storage chamber 5 to the grain drying chamber 6 while being circulated inside the drying chamber 6. The grains flowing down are exposed to hot air and dried, and the dried grains are discharged to the cooling storage chamber 1 of the cooling device 4 for cooling, and the dry grain sensor 9 detects the inside of the drying storage chamber 5. When it is detected that there are no grains left in the dry storage chamber 5, it is detected that the discharge of the grains in the drying storage chamber 5 has been completed, and cooling of the dried grains in the cooling storage chamber 1 is started, and this cooling storage The grains are circulated from the chamber 1 to the cooling collection trough 2 and left to cool. When the cooling is finished, the cooled grains are discharged outside the machine, and the cooled grain sensor 8 detects the grains in the cooling storage chamber. When it is detected that there are no more grains in the dryer, it is detected that the grain discharge is completed and the dryer is stopped.

During the next drying, the cooling grain sensor 8 and the drying grain sensor 9 detect that there are no grains in the cooling storage chamber 1 and the drying storage chamber 5, and the cooling device When double drying is performed in which the on-off valve 3 at the bottom of the cooling grain collecting trough 2 of No. 4 is controlled to be open, and the grains are circulated from the cooling device 4 to the hot air drying device 7 for drying. In this case, the on-off valve 3 is controlled to be open, and the remaining grains, which were previously left to cool and discharged onto this on-off valve 3, are placed in the hot air drying device 7 by the opening control of the on-off valve 3. It is discharged falling into the dry storage chamber 5,
At the same time, the dryer is controlled to discharge grains outside the machine, and the remaining grains are discharged from the drying storage chamber 5 through the drying chamber 6 to the outside of the machine. After this discharge, the grains are packed and double drying begins.

[0008]

According to the present invention, the air-cooled grain sensor 8 and the dry grain sensor 9 detect that there are no grains in the air-cooled storage chamber 1 and the dry storage chamber 5, and the air-cooled grain sensor 8 and the dry grain sensor 9 detect that there are no grains in the air-cooled storage chamber 1 and the dry storage chamber 5. On-off valve 3
When the control is changed from the closed state to the open state, the control automatically switches to the discharge operation that discharges the grains to the outside of the machine, and the grains are discharged to the outside of the machine. Newly dried grains are mixed with the grains and are no longer dried, so when grains crack or the sound of grains falling occurs, the removal operation is carried out, which increases reliability. improved.

[0009]

[Embodiment] The illustrated example shows a grain dryer 10 in which a cooling device 4 for cooling grains is installed in the upper part, and a hot air drying device 7 for drying the grains is installed in a stacked state in the lower part. . The cooling device 4 and the hot air drying device 7 of this dryer 10 have a rectangular shape that is long in the front and back direction, and the cooling device 4 on the upper part of the machine wall 11 is
A cooling transfer gutter 13 in which a cooling transfer spiral 12 is rotatably installed in the upper part and a cooling ceiling plate 14 are provided.
A cooling storage chamber 1 for storing grains is formed on the lower side, and a cooling full sensor 18 is provided in this cooling storage chamber 2 to detect the full state of grains, and also to detect the presence or absence of grains. The structure includes a cooling grain sensor 8 that detects the

[0010] At the lower side of the cooling storage chamber 1, there are provided cooling collecting troughs 2, 2 which communicate with the cooling storage chamber 1. It has a structure in which a grain transfer spiral 15 is installed, and diamond-shaped guide plates 16, 16 are provided above the cooling grain troughs 2, 2. As shown in FIG. 5, on-off valves 3, 3 are provided below the cooling grain troughs 2, 2 so as to be openable and closable, and the on-off valves 3, 3 are opened and closed by forward and reverse rotation of on-off valve motors 17, 17. This on-off valve 3, 3
In the open state, the grains in the air-cooled grain collection troughs 2, 2 are configured to fall and be supplied into the hot air drying device 7 on the lower side, and in the closed state, the grains in the air-cooled grain transfer spiral 15 are supplied. The cooling grain collecting trough 2
, 2 is configured to transport the grains laterally.

As shown in FIG. 6, the on-off valve 3 and the on-off arm 19 are rotatably mounted on the support shaft 19', and the on-off valve 3 is slidably moved through the elongated hole 20 of the on-off arm 19. The on-off valve 3 is opened and closed by the on-off valve motor 17, and is provided with a rotatable auxiliary arm 21 that holds one end of the on-off valve 3 to prevent the on-off valve 3 from opening naturally. The arm 21 is configured to be rotated by an auxiliary arm motor 22 that rotates in forward and reverse directions, and after the auxiliary arm 21 is in the open state, the on-off valve 3 is rotated.
is controlled to be open, and after the on-off valve 3 is closed, the auxiliary arm 21 is controlled to be closed, and these are provided separately for each on-off valve 3.

As shown in FIG. 7, the on-off valve 3 is configured to be opened and closed directly by the forward and reverse rotation of the on-off valve motor 17, and a convex portion 23 for holding is provided at the tip of the on-off valve 3, A holder 24 that engages and holds the convex portion 23 is rotatably provided, a connector length 25 is rotatably provided on the holder 24, and a connector length 25 is rotatably provided with a connector length 25. A short connector 26 is provided, and the connector short 26 is attached to a connector motor 27 that rotates in forward and reverse directions, and the convex portion 23 of the on-off valve 3 is connected to the holder 24 via the connector long and short 25 and 26. These are provided separately for each on-off valve 3 in order to hold the on-off valve 3 and prevent the on-off valve 3 from opening naturally.

As shown in FIG. 8, the on-off valve motor 17, which rotates forward and backward, rotates both the cooled grain transfer spirals 15, 15 and the on-off valves 3, 3 via respective belts 29, etc. A clutch 30 is provided on the support shaft 19' that supports the opening/closing valve 3, and this clutch 30 is configured to be turned on and off by a solenoid 28. The opening/closing valve 3 is configured to be controlled to be open or closed even when the grain 15 is being driven to rotate. The valve 3 is controlled to be in a closed state, and the on-off valves 3, 3 are controlled to be in an open state during double drying.

As shown in FIG. 9, the bottom of the on-off valve 3 is shaped into a slight arc, and the pivot point of the on-off valve 3 is provided in the upper part, and the fulcrum and one end of the on-off valve 3 are connected to each other. is configured in an inclined state, and by controlling the open state of the on-off valve 3, grains do not remain on this on-off valve 3. The shape and opening/closing method of the on-off valve 3 are configured to use any one of FIGS. 5 to 9.

[0015] A drying transfer gutter 32 having a drying transfer spiral 31 rotatably installed therein is provided in the center between the cooling grain collection gutter 2, 2. A drying storage chamber 5 of the hot air drying device 7 is formed below the drying transfer gutter 32, and a drying full amount sensor 3 for detecting the full amount of grains is installed in this drying storage chamber 5.
3, and a dried grain sensor 9 for detecting the presence or absence of grains. Also, on the lower side of this drying storage chamber 5, there are three ventilation chambers 34 on both left and right sides and in the center, and on both left and right sides. Between the ventilation chambers 35, 35, four grain drying chambers 6 are provided, and at the bottom of each drying chamber 6 there is rotatably supported a feeding valve 36 that feeds out the grains and lets them flow down. , each of the delivery valves 36 is configured to be rotationally driven by a delivery valve motor 37.

The lower side of each of the drying chambers 6 is connected to a drying grain collection gutter 39 in which a drying grain transporting spiral 38 is rotatably installed. On the front side of the machine wall 11, an air passage chamber 40 is formed which can communicate with each of the air blow chambers 35, 35, and a burner case 42 having a burner 41 therein is removably attached to the air passage chamber 40. An operating device 43 for starting and stopping the dryer 10 is detachably provided on the outer surface of the machine wall 11.

On the back side of the machine wall 11, each of the ventilation chambers 3 is provided.
4 is formed, and this ventilation path chamber 4
4. The central rear side exhaust cylinder 45 is provided with an exhaust fan 46 and an exhaust fan motor 47 for rotationally driving the exhaust fan 46. Each supply port for supplying the transferred grains to the cooling storage chamber 1 and the drying storage chamber 5 is provided at the center in the front-rear direction of the bottom plate of the cooling/drying transfer gutter 13, 32. On the sides, cooling/drying diffusion plates 48 and 49 are rotatably provided.

The grain hoisting machine 50 is installed outside on the back side of the machine wall 11, and has a belt attached to a bucket conveyor 51 stretched inside. One side of the tube 52 is in communication with the starting end of the cooling transfer gutter 13, and the other side is in communication with the starting end of the drying transfer gutter 32 via the falling tube 53. is provided with a discharge switching valve 54 which can be opened and closed freely.
is configured to be opened and closed by forward and reverse rotation of the dispensing cylinder motor 55', and when the dispensing switching valve 54 is open, the grains from the grain raising machine 50 are supplied to the cooling transfer gutter 13, and The grain is supplied to the dry transfer gutter 32 in a closed state, and the lower end is connected to the terminal end of the dry grain collection gutter 39 by providing a feed gutter 55, and 56 is a grain raising machine. The grain raising machine motor 56 is configured to rotate each part of the grain raising machine 50 using a motor.

The grain elevating machine 50 includes a moisture sensor 57 that receives the grains that fall while being conveyed to the upper part by the bucket conveyor 51, crushes the grains under pressure, and simultaneously detects the moisture content of the crushed grains. is provided and is configured to be rotationally driven by a moisture motor 58. A drying discharge funnel 59 is provided on the bottom plate at the starting end of the drying transfer trough 32, and a switching valve 60 is provided in the drying discharge funnel 59 so as to be openable and closable. When the switching valve 60 is closed, grains from the downflow tube 53 are supplied into the drying storage chamber 5 through the drying transfer gutter 32, and when the switching valve 60 is open, the grains are discharged outside the machine. The dry transfer spiral 31 in the dry transfer gutter 32 is connected to the dry transfer motor 6.
1 to drive the rotation.

Cooling discharge funnels 62, 62 are provided at the end portions of the cooling collecting grain troughs 2, 2, and a circulation switching valve 63 and a discharge switching valve 64 are provided in the cooling discharge funnel 62 so as to be openable and closable. established,
The circulation switching valve 63 is configured to be opened and closed by a circulation motor 65 that rotates in forward and reverse directions, and the discharge switching valve 64 is configured to be opened and closed by an exhaust motor 66 that rotates in forward and reverse directions. When the rotation of the cold collected grain transfer spiral 15 is stopped and both the circulation switching valve 63 and the discharge switching valve 64 are closed, the grains are allowed to stand still and cool in the cooling storage chamber 1, The grains are circulated and cooled by the closed state of the on-off valve 3, the rotational drive of the cooled grain transfer spiral 15, the open state of the circulation switching valve 63, and the closed state of the discharge switching valve 64. , the on-off valve 3
The grains are discharged to the outside of the machine in the closed state, the rotational drive of the cooled grain transfer spiral 15, the closed state of the circulation switching valve 63, and the open state of the discharge switching valve 64. The cooling grain transfer spiral 15 is configured to be rotationally driven by a cooling grain collection motor 67, and during standing cooling and single drying in which grains are dried by circulating only the hot air drying device 7, The cooling grain transfer spiral 15 is configured not to be rotationally driven.

The dryer 10 is configured to perform either single drying or double drying, and when single drying is performed, the discharge switching valve 54 of the discharge tube 52 and the drying discharge funnel 59 said switching valve 60,
The circulation switching valve 63 and the discharge switching valve 64 of the cooling discharge funnel 62 are in the open state, and the opening/closing valves 3, 3 of the cooling collecting grain troughs 2, 2 are in the closed state, and the cooling collecting funnel 62 is in the closed state. The grain transfer spirals 15, 15 are in a stopped state, and the grains in the drying storage chamber 5 are transported from the drying storage chamber 5 through the drying chambers 6, the drying grain collecting trough 39, and the supplying trough 55. The grain is transferred and supplied into the grain machine 50, conveyed to the upper part by the bucket conveyor 51, passed through the dispensing pipe 52 and the falling pipe 53, and is supplied into the drying transfer gutter 32. From the drying transfer gutter 32, the drying It is transferred and supplied onto the diffusion plate 49, and this dry diffusion plate 49
Then, the drying material is uniformly diffused and supplied into the drying storage chamber 5 and circulated for drying.

When double drying is performed, the discharge switching valve 54 of the discharge tube 52 and the on-off valves 3, 3 of the cold collecting grain troughs 2, 2 are opened, and the cold discharge is funnel 6
The circulation switching valve 63 and the discharge switching valve 64 of the drying discharge funnel 59 are closed, and the switching valve 60 of the drying discharge funnel 59 is closed, and the grains in the drying storage chamber 5 are The grains are transferred and supplied from the storage chamber 5 into the grain hoisting machine 50 via the drying chambers 6, the drying grain collection gutter 39, and the supply gutter 55,
It is conveyed to the upper part by the bucket conveyor 51, supplied from the dispensing cylinder 52 into the cooling transfer gutter 13, and transferred from the cooling transfer gutter 13 onto the cooling diffusion plate 48, and this cooling diffusion. Circulation is carried out in which grain is uniformly diffused and supplied into the cooling storage chamber 1 by the board 48, and then dropped from the cooling storage chamber 1 through the cooling collecting troughs 2, 2 and into the drying storage chamber 5. The structure is such that it is dried by

[0023] The cooling is performed by either standing cooling or circulation cooling, and when standing cooling is performed, the dispensing switching valve 54 of the dispensing tube 52 is opened. state, the opening/closing valves 3, 3 of the cooling grain collection troughs 2, 2 and the switching valve 60 of the drying discharge funnel 59 are in the closed state,
The circulation switching valve 63 and the discharge switching valve 64 of the cooling discharge funnel 62 are closed, and the cooling grain transfer spiral 15 is stopped, so that the dried grains in the drying storage chamber 5 are The grains are transferred from the drying storage chamber 5 to the grain hoisting machine 50 via the drying chambers 6, the drying gutter 39, and the supply gutter 55, and are conveyed to the upper part by the bucket conveyor 51. It is supplied from the outlet tube 52 into the cooling transfer gutter 13 , from the cooling transfer gutter 13 onto the cooling diffusion plate 48 , and evenly distributed into the cooling storage chamber 1 by the cooling diffusion plate 48 . It is configured to be diffused and supplied to the storage chamber 1 and allowed to stand still to cool.

When circulation cooling is performed, the discharge switching valve 54 of the discharge pipe 52 is opened, and the on-off valves 3, 3 of the cooling grain collection troughs 2, 2 and the dry discharge funnel 5
The switching valve 60 of the drying storage chamber 5 is closed, the circulation switching valve 63 of the cooling discharge funnel 62 is open, and the discharge switching valve 64 is closed. The dried grains are sent from the drying storage chamber 5 to the grain raising machine 50 via the drying chambers 6, the drying grain collection gutter 39, and the supply gutter 55.
The water is transported to the inside, transported to the upper part by the bucket conveyor 51, supplied from the discharge tube 52 into the cooling transfer gutter 13, and transferred and supplied from the cooling transfer gutter 13 onto the cooling diffusion plate 48. The grains are uniformly distributed and supplied into the cooling storage chamber 1 by the cooling diffusion plate 48, and from the cooling storage chamber 1 to the cooling collecting troughs 2, 2, the cooling discharge funnel 62, and the discharge tube 68. is fed into the grain raising machine 50 through the bucket conveyor 51.
from the dispensing cylinder 52 to the cooling transfer gutter 13.
from the cooling transfer gutter 13 to the cooling diffusion plate 4.
8, and is evenly diffused and supplied into the cooling storage chamber 1 by the cooling diffusion plate 48, where it is circulated and cooled.

The operating device 43 has a box shape, and the surface plate of the box is equipped with various parts of the dryer 10, the burner 41, the moisture sensor 57, etc., and is activated for each operation of discharge and cooling. Each start switch 69 to be operated, single start switch 7 to be operated separately for single drying and double drying
0, a double start switch 71, a stop switch 72 for stopping operation, a moisture setting knob 73 for setting the finishing target moisture of grains according to the operating position, a grain type setting knob for setting the temperature of the hot air generated from the burner 41 according to the operating position. A screwdriver 74 and a clamping amount setting knob 75 are provided, and the surface plate is equipped with a digital display section 76 and a monitor that alternately digitally display detected grain moisture, detected drying temperature, remaining drying time, etc. It is said that

The moisture sensor 5 is located inside the operating device 43.
7. An A-D converter 78 that converts the detected value detected by the hot air temperature sensor 77 that detects the temperature of the hot air in the ventilation chamber 35 from A to D, and the converted value converted by this A-D converter 78 is input. input circuit 79, the switches 69, 70, 71,
72 and the operation of the setting pinchers 73, 74, 75, and an input circuit 80 to which the detections detected by the cooling/drying full quantity sensors 18, 33 and the cooling/drying grain sensors 8, 9 are input.
, a built-in control device 83 consisting of a CPU 81 that performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits 79 and 80, and an output circuit 82 that receives and outputs various commands issued from the CPU 81. It is configured to do this. The setting knobs 73, 74, and 75 are of a rotary switch type, and are configured to set predetermined values, types, etc. depending on the operating position.

The operation control by the control device 83 is performed as follows. That is, the double start switch 71 is operated from single drying, and the contents of this operation are input to the CPU 81 to control switching to double drying (step 1), and the presence or absence of grains in the drying storage chamber 5 is determined by the It is detected by the dry grain sensor 9, and the absence of grain is detected and inputted (step 2), and the presence or absence of grain in the cooling storage chamber 1 is detected by the cooling grain sensor 8. When it is detected and input that there are no grains (step 3), each part of the dryer 10 is configured to be controlled as follows to discharge the grains to the outside of the machine.

The discharge switching valve 54 of the discharge cylinder 52 is controlled to be open (step 4), and the dry discharge funnel 59
The switching valve 60 is controlled to be open (step 5),
The grain raising machine 50, the cooling grain transfer spiral 12, and the drying transport spiral 31 are started (step 6), and the cooling grain collecting spiral 15, the dry grain collecting transport spiral 38, and the delivery valve 38 are started. (Step 7), the exhaust fan 46 is started (Step 8), the on-off valve 3 is controlled to be open (Step 9), and the operation is controlled for a predetermined time set and stored in the CPU 81 (Step 10). , within this predetermined time, when the on-off valve 3 is opened, the cooled remaining grains that remain on the on-off valve 3 and fall are discharged outside the machine, and after this predetermined time has elapsed, Each part of the dryer 10 is controlled to switch to a state in which grains are double-dried (step 11), and the dryer 10 is controlled to be stopped (step 12).

When it is detected that there are grains in the drying storage chamber 5, it is determined whether or not the grains in the cooling storage chamber 1 and the grains in this drying storage chamber 5 may be mixed. is detected (step 13), and when it is detected that the grains may be mixed, the on-off valve 3 is controlled to be open (step 14), and each part of the dryer 10 is switched to a state where the grains are double-dried. The configuration is controlled (step 15). If it is detected that mixing is not possible, the switching control to double drying is canceled (step 16), and single drying is continued (step 17).

When it is detected that there are grains in the cooling storage chamber 1, the on-off valve 3 is controlled to be open (step 18), and each part of the dryer 10 is controlled to be switched to a double drying state. (Step 19). In addition, the control device 83 has the following functions. That is, the operation details of the moisture setting knob 73 are input to the CPU 81, the finishing target moisture is set by this input, the grain moisture detected by the moisture sensor 57 is also input to the CPU 81, and these detected grain moisture and a set finishing target moisture content, and when the detected grain moisture reaches the finishing target moisture content, the dryer 10 is automatically stopped and the drying of the grains is stopped.

The hot air temperature set by operating the setting knobs 74 and 75 and the hot air temperature detected by the hot air temperature sensor 77 are compared, and if they are different, the hot air temperature becomes the same as the set hot air temperature. The structure is such that the amount of combustion fuel is controlled to increase or decrease. Further, on the surface plate of the operating device 43,
A transport switch 84 is provided which is operated when dropping grains from the cooling device 4 to the hot air drying device 7, and when the transport switch 84 is operated, the content of the operation is input to the CPU 81, With this input, the opening/closing valve 3 is controlled to open after a predetermined period of time set and stored in the CPU 81 has elapsed after the exhaust fan 46 is driven to rotate.

The operation of the above embodiment will be explained below. When the double start switch 71 of the operation device 43 of the grain dryer 10 is operated to switch from single drying to double drying, the inside of the cooling storage chamber 1 of the cooling device 4 and the drying storage chamber of the hot air drying device 7 are The presence or absence of grains in the cooling/drying grain sensor 8 and 9 is detected by the cooling/drying grain sensors 8 and 9, and when it is detected that there are no grains in both, the bottom of the cooling collecting gutter 2 of the cooling device 4 is opened/closed. The valve 3 is controlled to be open, and each part of the dryer 10 is controlled to discharge the grains, and the cooled grains remaining on the open/close valve 3 are removed from the hot air dryer 7. The grains are dropped and supplied into the drying storage chamber 5, and are transferred and supplied from the drying storage chamber 5 through the grain drying chamber 6, the drying grain collecting gutter 39, and the supplying gutter 55 into the grain hoisting machine 50 by the drying grain transfer spiral 38. The grains are conveyed to the upper part by the bucket conveyor 51 of this hoisting machine 50, and are discharged to the outside of the machine via the dumping tube 52, the falling tube 53, and the drying discharge funnel 59. After this operation has been carried out for a predetermined time, the drying machine 10 is automatically stopped.

When double drying the grains housed in the dryer 10, the setting knob 73 of the operating device 43
, 74, 75 to predetermined positions and the double start switch 71 that starts double drying starts each part of the dryer 10, the burner 41, and the moisture sensor 57, and at the same time starts the drying process. The on-off valves 3, 3 of the gutters 2, 2
The dispensing switching valve 54 of the dispensing tube 52 is controlled to be open, and the switching valve 60 of the drying discharge funnel 59 is controlled to be closed,
Also, the circulation switching valve 63 and the discharge switching valve 64 of the cooling discharge funnel 62
is controlled to be in a closed state, and double drying is started.

The hot air generated from the burner 41 starts from the air passage chamber 40, passes through the air chambers 35, 35, passes through each of the drying chambers 6, passes through each exhaust chamber 34 and the air exhaust passage chamber 44, and then is sent to the exhaust fan 4.
6, the grains stored in the cooling storage chamber 1 of the cooling device 4 are transferred from the cooling storage chamber 1 through the cooling grain collection troughs 2, 2 to the hot air. The drying material is supplied falling into the drying storage chamber 5 of the drying device 7, is exposed to the hot air while flowing down from the drying storage chamber 5 into each of the drying chambers 6, is dried, and is delivered to the lower part by each drying delivery valve 36. The dried grains flow down from the dry grain collection gutter 39, pass through the supply gutter 55, and are transferred and supplied into the grain hoist 50 by the dry grain transfer spiral 38 in the dry grain collection gutter 39, and are fed to the bucket conveyor 51. The cooling transfer spiral 12 in the cooling transfer gutter 13 is conveyed to the upper part and supplied into the cooling transfer gutter 13 through the dispensing cylinder 52, and from the cooling transfer gutter 13 onto the cooling diffusion plate 48. The grain moisture is transferred and supplied by the air-cooling diffusion plate 48 and is evenly diffused and returned into the cooling storage chamber 1 for circulation drying. When the finishing target moisture content is reached, the dryer 10 is automatically stopped under automatic control by the control device 83 of the operating device 43, and the drying of the grains is stopped.

[Brief explanation of drawings]

The figure shows one embodiment of the invention.

[Figure 1] Block diagram

[Figure 2] Flowchart

[Figure 3] Overall side view of grain dryer

[Figure 4] Enlarged sectional view taken along line A-A in Figure 3

[Figure 5] B-B enlarged sectional view of Figure 3

[Figure 6] BB enlarged sectional view of Figure 3

[Figure 7] B-B enlarged sectional view in Figure 3

[Figure 8] BB enlarged sectional view of Figure 3

[Figure 9] BB enlarged sectional view in Figure 3

[Figure 10] Enlarged front view of part of the grain dryer

[Fig. 11] Enlarged perspective view of part of the grain dryer

[Figure 12] Enlarged partially cutaway front view of a part of the grain dryer

[Explanation of symbols]

1 Cooling storage chamber 2 Cooling grain collection gutter 3 On-off valve 4 Cooling device 5 Dry storage room 6 Grain drying room 7 Hot air drying device 8 Cooling grain sensor 9 Dry grain sensor

Claims (1)

[Claims] Claim 1: A cooling device 4 that feeds out grains from an upper cooling storage chamber 1 to a lower cooling collecting trough 2 with an on-off valve 3 at the bottom closed, circulates and cools the grains, and an upper drying storage chamber. 5 to a grain drying chamber 6 on the lower side, and a hot air drying device 7 for drying by blowing hot air into the drying chamber 6 while circulating the grains to flow down. A cooling grain sensor 8 and a drying grain sensor 9 detecting whether there are grains in the cooling/drying storage chambers 1 and 5. At the same time, when the on-off valve 3 is controlled from the closed state to the open state, the remaining grains remaining on the on-off valve 3 are dropped into the hot air drying device 7 and are controlled to be discharged outside the machine. An operation control method characterized in that the dryer is automatically stopped after a predetermined period of time has elapsed.