JP2017146051A - Grain drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grain drier having a cylindrical delivery valve and capable of controlling as desired in accordance with a grain type and the progress of drying.SOLUTION: A grain drier 1 comprises: a delivery valve 106 in which grains are circulated and dried from a storage part 101 through a drying part 102, and a grain collection part 103, and the grains flowed down from the drying part 102 are received and delivered to the grain collection part 103, the delivery valve 106 including a valve outlet 106a with a cross section in the axial direction being opened in a substantially C shape; a control part 107 for controlling the rotation of the delivery valve 106; and further means for obtaining grain type, in which the control part 107, while intermittently rotating the delivery valve with a prescribed pivot angle width, makes the valve outlet 106a face the grain collection part and variably controls the pivot angle width according to the obtained type of grain. Thereby, the delivery valve can be controlled as desired in accordance with a grain type and the progress of drying.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a grain dryer in a grain circulation form.

  As this kind of grain dryer of the grain circulation form, conventionally, the one controlled to drive the feeding valve intermittently and feeding from the drying section for drying the grain to the lower grain collecting section is known. (For example, refer to Patent Document 1).

  Further, as a feeding valve, a cylindrical feeding valve is known which is formed in a hollow cylindrical shape and is provided with a valve port which is a long hole in the axial direction (see, for example, Patent Document 2). According to this cylindrical feeding valve, since it can be manufactured at a low cost with a simple configuration, the manufacturing cost of the entire grain dryer can be suppressed. This cylindrical feeding valve is driven repeatedly alternately in the forward and reverse directions at predetermined cycle times. When the valve port faces the drying section, the grain flows down and is filled in the feeding valve. When facing the grain collection part, the filled grain falls into the grain collection part so that the grain is fed out.

JP 2002-122381 A JP 2005-49027 A

However, the cylindrical feed valve described in Patent Document 2 has the following problems.
When the grain in the grain dryer is dried and low in moisture, the volume shrinks and the fluidity increases, so the density of the grain filled in the valve increases in one delivery, and the grain in the cycle time increases. The amount of grain feed increases. As a result, the grain that has fallen to the cereal collecting part is conveyed by the cereal collecting spiral, but there is a problem that the grain is easily damaged by being pressed by increasing the number of grains in the cereal collecting spiral. In particular, when the grain is beans or buckwheat, the problem is a serious problem because the grain is particularly easily damaged. The cylindrical feed valve described in Patent Document 2 has problems such as not only a problem of grain damage but also noise and overload.

  In order to deal with problems such as scratching of the grain, it is conceivable that the feeding of the grain is made gentle gradually. However, if the feeding of the grain is made gentle gradually, the circulation speed is lowered and the drying speed is reduced. There is a risk of deterioration due to a decrease in efficiency and excessive temperature rise of the grain. Therefore, it is desirable to develop a cylindrical metering valve that can adjust the amount of grain feed, depending on the type of grain, based on characteristics such as ease of scratching and alteration and the progress of drying. ing.

  Then, an object of this invention is to provide the grain dryer provided with the cylindrical delivery valve | bulb which can be controlled as desired according to the kind of grain and progress of drying.

An object of the present invention is a feeding valve that circulates and drys grains from a storage unit through a drying unit and a cerealing unit, receives the grain flowing down from the drying unit, and feeds it to the cerealing unit. In the grain dryer comprising a valve opening having a substantially C-shaped cross section, and a control unit for controlling the rotation of the feeding valve,
Furthermore, it has a means for acquiring the grain type,
While the control unit rotates the feeding valve intermittently with a predetermined rotation angle width, the valve port is opposed to the cereal collection unit, and the rotation angle width depends on the type of the acquired grain. This is achieved by a grain dryer characterized in that it is variably controlled.
According to the present invention, the control unit is controlled to make the valve port face the cereal collecting unit while intermittently rotating the feeding valve with a predetermined rotation angle width. By intermittently turning to adjust the feeding amount of the grain and leveling it, and suppressing the load on the grain, it becomes possible to prevent the grain from being damaged and the grain falling The noise at the time can be reduced and overloading of the cereal collecting spiral can be prevented.

In a preferred embodiment of the present invention, the control unit is configured to rotate the feeding valve with a rotation angle width smaller than the straw when the obtained grain type is beans or buckwheat. .
When the grain is beans or buckwheat, the grain is easily broken and more easily damaged than the cocoon. However, according to a preferred embodiment of the present invention, the control unit uses the optimum rotation angle width for the cocoon as a reference. In the case of bean or buckwheat, the feed valve is controlled to rotate with a rotation angle width smaller than that of the straw. It is possible to prevent cracking and obtain a high damage prevention effect.

In another preferred embodiment of the present invention, the control unit is configured to rotate the feeding valve while gradually decreasing the rotation angle width according to the progress of drying from the start of drying.
In general, as the drying of the grain progresses, when the drying progresses and the moisture content becomes low, the volume shrinks and the fluidity becomes high, so that the density of the grain accumulated in the valve increases. As a result, the amount of the grain flowing out from the quantitative feed valve increases by one delivery, and it becomes easy to cause problems such as scratches when the grain falls, noise, and overloading of the grain collecting spiral. According to this preferred embodiment of the present invention, the controller is configured to rotate the supply valve while gradually decreasing the rotation angle width in accordance with the progress of drying from the start of driving. The amount of the grain fed from the valve to the grain collecting unit can be kept constant. Therefore, even if the drying of the grain progresses, there are problems of grain damage, noise, and overloading of the grain collecting spiral. It is possible to prevent the occurrence.

In a further preferred embodiment of the present invention, the control unit is configured to rotate the feeding valve by setting the rotation angle width to a maximum when discharging the grain out of the machine. ing.
According to this preferred embodiment of the present invention, the control unit is configured to operate the feeding valve by setting the rotation angle width to the maximum when discharging the grain out of the machine. Grains can be quickly discharged out of the grain dryer, and the convenience of the grain dryer can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the grain dryer provided with the cylindrical delivery valve | bulb which can be controlled as desired according to the kind of grain and progress of drying.

1 is an external perspective view of a grain dryer according to an embodiment of the present invention. It is front sectional drawing of the grain dryer of FIG. It is a sectional side view of the drying part and grain collection part of the grain dryer of FIG. It is a disassembled perspective view of the circulation mechanism of the grain dryer of FIG. It is the schematic of the operation panel of the grain dryer of FIG. It is a schematic block diagram of the control part of the grain dryer of FIG. It is a figure explaining the operation | movement of the delivery valve | bulb of the grain dryer of FIG. 1 (the 1). It is a figure explaining operation | movement of the delivery valve | bulb of the grain dryer of FIG. 1 (the 2). It is a figure explaining the operation | movement of the feeding valve of the grain dryer of FIG. 1 (the 3). (A)-(C) It is a time chart which concerns on operation | movement of the delivery valve | bulb of the grain dryer of FIG. (A)-(C) It is a time chart which concerns on operation | movement of the delivery valve | bulb of the grain dryer of FIG. 1 which concerns on another Example. It is a flowchart which shows control of the grain dryer of FIG. 1 which concerns on another Example.

  Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.

FIG. 1 is an external perspective view of a grain dryer 1 according to an embodiment of the present invention.
The grain dryer 1 is provided with an input hopper 112 for feeding grains and an operation panel 201 provided with various operation switches on the front surface of the machine body outer wall 100 formed in a box shape as a whole.

2 is a front sectional view of the grain dryer of FIG.
As illustrated in FIG. 2, the grain dryer 1 includes a storage unit 101 that stores grains, a drying unit 102 that blows and blows hot air on the grains, and a cereal collection that collects grains that flow down from the drying unit 102. The grain dryer main body 104 in which the sections 103 are sequentially stacked and the grain circulation mechanism including the cerealing section 105 provided along the outer wall of the machine body as shown in FIG. To do. The storage unit 101 includes an overhanging grain amount detection sensor, and can measure the amount of overhanging by measuring the height position of the top surface of the overhanging kernel.

  The drying unit 102 includes a combustion burner 102g that generates hot air, a hot air chamber 102f through which the hot air generated by the combustion burner 102g passes, a far-infrared radiator 102c in the hot air chamber 102f, and both left and right sides of the hot air chamber 102f. And a grain flow lowering chamber 102a, 102b in which the grain flows down.

  At the lower part of the drying unit 102, a feeding valve 106 for feeding the grain to the lower grain collecting unit 103 is provided. The feeding valve 106 is rotationally controlled by the control unit 107 of the grain dryer 1 and sequentially feeds the grains to the grain collecting unit 103. Then, the grain fed out to the cereal collection unit 103 falls on the cereal collection spiral 108 provided at the lower end of the cereal collection unit 103 leading to the cerealing unit 105.

FIG. 3 is a side sectional view of the drying unit 102 and the grain collecting unit 103 of the grain dryer 1 of FIG.
The hot air generated by the combustion burner 102g passes through the hot air chamber 102f and is discharged as exhaust air by the action of the exhaust fan 102d. Moreover, the far-infrared radiator 102c is provided in the hot-air chamber 102f, and the grain is dried by the action of hot air and far-infrared rays. The combustion burner 102g is accommodated in the burner case 102e.

FIG. 4 is an exploded perspective view of the grain circulation mechanism of the grain dryer 1 of FIG.
The grain circulation mechanism of the grain dryer 1 will be described with reference to FIG. The grain collecting spiral 108 conveys the grain fed by the feeding valve 106 to the front side of the grain dryer 1. The grain transported to the front side of the grain dryer 1 is transported upward by the ascending unit 105, and further supplied to the spreader 110 of the storage unit 101 by the upper spiral 109 connected to the upper side of the ascending unit 105. By doing so, the grains are uniformly accumulated and stored on the entire surface of the storage unit 101.

  A moisture meter 105 a that takes in grains falling from the bucket of the cerealing unit 105 and measures the moisture value is provided in the middle of conveyance to the upper part of the cerealing unit 105. A discharge shutter 105b for discharging the grain out of the machine is provided on the upper part of the cerealing part 105. The upper spiral 109 is provided with a dust discharger 109 a that sucks and discharges swarf and the like mixed with the grains conveyed by the upper spiral 109. The feeding valve 106 is connected to the feeding valve motor 106b. The control of the feeding valve motor 106b is controlled by the control unit 107, whereby the rotation of the feeding valve 106 is controlled.

FIG. 5 is a schematic diagram of an operation panel 201 for operating the grain dryer 1.
The operation panel 201 is provided with various operation switches. The operation switch includes a tension switch 202 for tensioning grains, a ventilation switch 203 for so-called ventilation operation for driving the exhaust fan 102d and the grain circulation mechanism, and drying for performing a drying operation by igniting the combustion burner 102g. A switch 204, a discharge switch 205 for discharging operation for discharging the grain in the storage unit 101 to the outside of the machine, and a stop switch 206 for stopping the operation are provided.

  Also, a grain setting switch 207 for selecting the type of grain stretched in the storage unit 101, a drying speed selection switch 208 for selecting a drying speed, a moisture setting switch 209 for setting a target moisture value, and an amount of tension A tension amount setting switch 210 and an emergency stop switch 211 are provided.

In addition, a drying operation display screen 212 for displaying information on the drying operation such as the moisture value and the remaining drying operation time, and a setting display screen s for displaying the setting amount or the setting moisture value are provided.
A control unit 107 that controls the operation is built in the operation panel 201.

FIG. 6 shows a schematic block diagram of the control unit 107.
The control unit 107 receives the switch information of the operation panel 201 and the detection information from the sensors provided in each part of the grain dryer main body 104, and controls the burner combustion amount and starts / Stop control, display content control of the display unit of the operation panel 201, rotation control of the feeding valve 106, and the like are performed.

  Provided on the input side of the control unit 107 is a signal obtained by operating various switches of the operation panel 201. In addition, moisture detection means such as a moisture meter 105a, grain flow detection means, outside air temperature detection means, hot air temperature detection means, and the like are provided.

  On the output side of the control unit 107, a feeding valve motor for driving the feeding valve 106, each motor of a grain circulation mechanism such as the cereal collecting spiral 108, the upper spiral 109, and the rising part 105, a burner motor, a pump, etc. And a suction fan motor such as an exhaust fan 102d, and a liquid crystal display section of a drying operation display screen 212 and a setting display screen 213 of the operation panel 201 are provided.

7, 8, and 9 are diagrams illustrating the operation of the feeding valve 106.
As shown in FIG. 7, the feeding valve 106 is formed in a hollow cylindrical shape, and is provided with a valve port 106a formed of a long hole whose longitudinal direction is the axial direction thereof. The feed valve motor 106b, the operation of which is controlled by the control unit 107 of the grain dryer 1, is rotated around the shaft 106c by repeating forward and reverse rotations at regular intervals. When the valve port 106 a faces the upper drying unit 102, grains flow from the drying unit 102 and are stored in the feeding valve 106. Next, when the valve port 106 a faces the cereal collection unit 103, the grain flows down to the cereal collection unit 103 to feed out the grain. Note that gaps between the feeding valve 106 and the grain flow lower chambers 102a and 102b are closed with seal members 103a and 103b.

Next, the operation of the feeding valve 106 will be described in detail.
In the initial position, the valve port 106a of the feeding valve 106 faces vertically downward (see FIG. 7). First, the feeding valve 106 starts clockwise forward rotation. In this case, the valve port 106a of the feeding valve 106 passes through the lower end of the left grain flow lowering chamber 102a (see FIG. 8). During this passage, the grains in the left-side grain flow lowering chamber 102a flow into the valve port 106c, so that the storage chamber 106d is filled with the grains. The position of the valve port 106a at this time is defined as a filling angle position during normal rotation. The feeding valve 106 continues normal rotation, and the valve port 106a passes through the lower end of the right grain flow lowering chamber 102b. At this time, since the inside of the storage chamber 106d is already filled with the grain, the grain hardly flows from the right grain flow lowering chamber 102b, the feeding valve 106 further rotates forward, and the valve port 106a moves downward. When faced, the grain in the storage chamber 106d falls and is supplied to the grain collecting spiral 108.

  When the feeding valve 106 is reversely rotated (counterclockwise), when the valve port 106a passes through the right grain flow lowering chamber 102b, it flows from the right grain flow lowering chamber 102b into the storage chamber 106d and enters the storage chamber 106d. Is filled (see FIG. 9). The position of the valve port 106a at this time is the filling angle position during reverse rotation. Then, further reversely, the valve port 106a passes through the lower end portion of the left grain flow lowering chamber 102a, the valve port 106a faces downward, and the grain in the storage chamber 106d is dropped and discharged.

FIGS. 10A to 10C are time charts related to the operation of the feeding valve 106.
Specifically, a rectangular wave related to the rotation control of the feeding valve 106 is illustrated with time taken on the horizontal axis. The control unit 107 performs rotation control so that the feeding valve 106 is rotated forward in the rectangular wave at the upper part of the horizontal axis, and is reversed in the rectangular wave at the lower part of the horizontal axis. Accordingly, the feeding valve 106 rotates with a predetermined rotation angle width at the top of the rectangular wave, and stops at the bottom and intermittently rotates. Here, the rotation angle width refers to the width of the angle at which the feeding valve 106 is continuously rotated by one rectangular wave.

  Here, since the horizontal axis represents time, the larger the width of the top or bottom of the rectangular wave, the longer the rotation or stop time. Therefore, if the rotation speed of the feeding valve 106 is constant, the rotation angle width is proportional to the width of the top of the rectangular wave. The time during which the feeding valve 106 is stopped is proportional to the width between the tops.

  10A and 10B, the valve port 106a rotates normally from the initial position to the filling angle position during normal rotation. Between the rectangular wave S1 and the rectangular wave S2, the rotation of the feeding valve 106 is stopped, and an interval for allowing the grains to sufficiently flow into the accommodation chamber 106d is provided.

  By the rectangular wave S2 in FIGS. 10A and 10B, the valve port 106a rotates forward from the filling angle position during forward rotation to just before the discharge angle position. That is, the valve port 106a faces the cereal collection unit 103 and rotates forward to a position immediately before the start of grain outflow. The position of the valve port 106a at this time is defined as a discharge angle position.

  Next, by the rectangular wave S3, the valve port 106a rotates forward from the discharge angle position to the initial position. The feeding valve 106 rotates at the top of each rectangular wave of the rectangular wave S3, temporarily stops between the rectangular waves, and gradually turns the valve port 106a to the cereal collecting unit 103 while rotating intermittently. By facing each other, the grains are fed out to the cereal collection unit 103 step by step. In this way, the control unit 107 rotates the feeding valve 106 intermittently, and turns it at a pseudo speed to gradually turn the valve port 106a toward the grain collection unit 103 when the grain is fed. Control. As a result, the grain is prevented from falling onto the grain collecting spiral 108 at a time, the load on the grain is reduced, and damage is prevented. In addition, noise can be reduced by reducing the impact when the grain falls. Furthermore, since the amount of the grain flowing into the cereal spiral 108 at a time is also leveled, an overload of the cereal spiral 108 can be prevented. As described above, the delivery of one grain is completed by the rectangular waves S1 to S3.

  Next, the feeding valve 106 is controlled to rotate in reverse and intermittently by the rectangular waves G1 to G3. At the time of reverse rotation, the position at which the valve port 106a passes the lower end of the right grain flow lowering chamber 102b becomes the filling angle position at the time of reverse rotation. Since the operation at the time of reverse rotation by the rectangular waves G1 to G3 is the same as that in which the rotation direction of the rotation control by the rectangular waves S1 to S3 at the time of normal rotation is reversed, the description is omitted.

  Note that the sum of the widths of the tops of the rectangular waves of S1 to S3 is the width of one rectangular wave required to rotate the valve port 106a of the feeding valve 106 once from the initial position. The same applies to the rectangular waves G1 to G3. Therefore, since the total width of the rectangular waves S1 to S3 required for one rotation of the valve port 106a from the initial position is constant, if there are many rectangular waves to be generated during one rotation, If the number of rectangular waves is small, the width of one rectangular wave is relatively large.

  That is, in one rotation of the feeding valve 106, the width of the rectangular wave is reduced and the number of rectangular waves to be generated is increased, so that the rotation angle width is reduced, and the feeding valve 106 is intermittently rotated. Move. Therefore, if the rotation angle width is reduced, the grains are gradually dropped and discharged. On the contrary, if the rotation angle width is increased, the grains are dropped and discharged more quickly.

  Here, the rectangular wave S3 of FIG. 10A and FIG. 10B is different in the width of one rectangular wave. That is, FIG. 10A shows that the grains in the storage chamber 106d are gradually dropped and discharged. The same applies to the rectangular wave G3 during reverse rotation. Specifically, in FIG. 10A, the number of times that the rotation is intermittently paused from the feeding by the rectangular wave S3 to the completion of feeding is three times, but in the case of FIG. 10B, it is one time. That is, in FIG. 10 (A), the number of times of temporarily stopping rotation is larger in FIG. 10 (A) than in FIG. 10 (B), so that the grain flows out to the cereal collection unit 103 more slowly. Note that the rotation angle width in FIG. 10B is larger than that in FIG.

  In a further preferred embodiment of the present invention, when the user operates the discharge switch 205 of the operation panel 201, the control unit 107 sets the rotation angle width to the maximum and operates the feeding valve 106. That is, when the grain drying is finished and the grain is discharged from the grain dryer 1, the intermittent control of the feeding valve 106 is similarly inconvenient for the user because the grain discharge is delayed. . Therefore, at the time of grain discharge, it is desirable that the rotation angle width is set to the maximum so that the grain is quickly fed out from the feeding valve 106 and the grain is discharged quickly. That is, when the discharge switch 205 is operated, the control unit 107 shifts to the control of FIG. As a result, the rotary valve is continuously rotated forward and reverse, and the grains in the storage unit 101 can be quickly discharged. This improves the convenience for the user.

  In consideration of problems such as damage to the grain, after the discharge switch 205 is operated, the rotation angle width may be increased and discharged. Thereby, the discharge speed | rate of a grain can be raised, preventing that a grain is damaged by being discharged | emitted at once at the time of discharge | emission.

In a further preferred embodiment of the present invention, the user can select the type of grain to be dried by operating the grain setting switch 207 of the operation panel 201, and the control unit 107 can control the grain selected by the operation panel 201. The rotation angle width is set in advance according to the type. For example, the rotation angle width of the rectangular waves S3 and G3. This makes it possible to make fine adjustments according to the fragility of the grain by setting the turning angle width of the grain to advance according to the type of grain. Can prevent scratches. Thereby, the damage prevention effect of a grain can further be improved.
In particular, when the grain is bean or buckwheat, the grain is easily damaged. Therefore, by operating the feeding valve 106 with a rotation angle width smaller than that of the straw, the cracking of the grain is prevented and a high damage prevention effect is obtained. can get.

  In a further preferred embodiment of the present invention, the control unit 107 rotates the feeding valve 106 by decreasing the rotation angle width according to the progress of drying from the start of drying. For example, the rotation angle width of the rectangular waves S3 and G3 is gradually decreased. The control unit 107 acquires the progress of drying by the moisture meter 105a. According to this configuration, the control unit 107 gradually decreases the rotation angle width during one rotation of the feeding valve 106 and increases the number of rectangular waves as the grain drying progresses. As a result, the feeding valve 106 rotates more gradually. In general, as grain drying progresses, the fluidity of the grain increases and the volume of the grain decreases. Then, the density of the grain in the valve 106 is increased. In response to this, the feeding valve 106 is rotated in small increments, and the feeding is slowed down so that the feeding amount of the grain can be leveled even when the drying of the grain proceeds. As a result, even if the drying of the grain proceeds, it is possible to prevent the grain from being damaged and the grain collecting spiral 108 from being overloaded.

Next, rotation control of the feeding valve 106 according to another embodiment will be described.
The rotation speed of the feeding valve 106 is constant (for example, one rotation in 10 seconds), but the number of rotations per unit time can be changed.
For example, FIG. 11 (A) shows a first rotation control in which the feeding valve 106 is rotated forward in a continuous manner a plurality of times (three times) and then rotated a plurality of times (a third time) continuously in reverse. Yes. FIG. 11B shows the second rotation control in which the motor rotates forward once and rotates at the initial position with a period of reverse rotation once after a set time stop (interval). The interval time in the second rotation control is preferably a short time (for example, 2 to 5 seconds) shorter than the time required for rotation. FIG. 11C shows the third rotation control in which the interval time is longer than the second rotation control. The interval in the third rotation control is desirably set longer than the time for which the rotary valve rotates once (for example, 20 seconds). Thus, the number of rotations (rotation amount) per unit time of the first rotation control is the largest.

Next, a drying operation using the rotation control of the feeding valve 106 of FIG. 11 will be described along the flowchart of FIG.
First, a tension operation is performed in which the grain is put into the storage unit 101 from the charging hopper 112 (step S1). At this time, the moisture value of the grain that has been cerealed by the cerealing unit 105 is measured by the moisture meter 105a. After the tensioning operation is completed, the user selects the type of grain that has been stretched with the grain setting switch 207, selects a desired drying speed with the drying speed selection switch 208, and sets the target with the moisture setting switch 209. The moisture value is set, and the amount of cereal that has been stretched by the stretch amount setting switch 210 is input.

First, the case where the straw is dried to a target moisture value of 14% will be described.
When the drying switch 204 is operated, the circulation mechanisms such as the combustion burner 102g, the exhaust fan 102d, and the dust exhauster 109a start to drive, and the grain is subjected to a drying action in the drying unit 102 while circulating in the apparatus (step S3).

  When the moisture value of the soot measured during the tension operation is 18% or more, the first rotation control with a large number of rotations per unit time of the feeding valve 106 is performed (step S5). That is, at the start of drying, a lot of long foreign matters such as swarf are contained, and a cocoon having a high moisture value has a low bulk density. Therefore, by rotating the feeding valve 106 a lot, a circulation amount is secured and stable circulation is achieved. To do. In addition, it quickly converges moisture variations and spots.

  When the drying operation proceeds and the moisture value of the soot reaches less than 18%, the rotation control of the feeding valve 106 is switched from the first rotation control to the second rotation control (step S7). That is, as the drying operation proceeds, long foreign matters are sucked and discharged by the dust remover 109a, and the bulk density of the soot due to a decrease in the moisture value increases, so even if the rotation speed of the feeding valve 106 is reduced, The amount of dredging can be secured. When 14% of the target moisture value is reached, the combustion burner 102g stops and the drying operation ends (step S9). By controlling the rotation of the feeding valve 106 according to the present embodiment, a stable amount of circulation can be ensured in both the case of the soot in the high moisture region and the case of the soot in the low moisture region. Can drive.

Next, the drying operation of wheat will be described.
In the case of wheat, the change in the bulk density due to the reduction of the moisture value is smaller than that of straw, and damage due to an increase in the rotation speed of the feeding valve 106 is likely to occur. Second rotation control is performed (step S12).

Next, soybean drying operation will be described.
In the case of soybean, since it is easier to damage due to circulation than straw and wheat, the drying operation is performed with the third rotation control with the smallest number of rotations (step S17).
In the present embodiment, the switching from the first rotation control to the second rotation control is performed based on the moisture value. In addition, when the set time (for example, 1 hour) elapses from the start of the drying operation, the first rotation control is performed. The rotation control may be switched to the second rotation control. The set time in this case is changed according to the amount of extension set by the extension amount setting switch 210. That is, the time for which the cereal grains are circulated differs depending on the amount of squeezing. Therefore, the first rotation control is performed for the time required for one circulation, and the second rotation control is performed for the drying operation after the second circulation.

  The rotation control switching based on the set time may be used when the grain moisture value at the time of filling is less than the set moisture value (less than 18%). That is, even if the grain at the start of drying is less than 18%, the first rotation control is performed for the first set time, and the second rotation control is switched when the set time elapses. Thereby, even if the moisture value at the time of tension is low, it is possible to cope with a case where a lot of long foreign matters are contained.

DESCRIPTION OF SYMBOLS 1 Grain dryer 100 Body outer wall 101 Storage part 102 Drying part 102a, 102b Grain flow lowering chamber 102c Far-infrared radiator 102d Exhaust fan 102e Burner case 102f Hot-air chamber 102g Combustion burner 103 Grain collecting part 103a, 103b Seal member 104 Grain drying Machine main body 105 Grain raising part 105a Moisture meter 105b Discharge shutter 106 Feed valve 106a Valve port 106b Feed valve motor 106c Shaft 106d Accommodating chamber 107 Control part 108 Grain collecting spiral 109 Upper spiral 109a Dust remover 110 Diffusion plate 112 Input hopper 201 Operation panel 202 Tension switch 203 Ventilation switch 204 Drying switch 205 Discharge switch 206 Stop switch 207 Grain setting switch 208 Drying speed selection switch 209 Moisture setting switch 210 Overlay amount setting switch 211 Sudden stop switch 212 drying operation display screen 213 setting display screen

Claims (4)

A feeding valve that circulates and drys the grain from the storage part through the drying part and the grain collecting part, receives the grain flowing down from the drying part and feeds it to the grain collecting part, and has an approximately C-shaped axial section. In the grain dryer comprising a valve opening that is open to the control unit for controlling the rotation of the feeding valve,
Furthermore, it has a means for acquiring the grain type,
While the control unit rotates the feeding valve intermittently with a predetermined rotation angle width, the valve port is opposed to the cereal collection unit, and the rotation angle width depends on the type of the acquired grain. Grain dryer characterized by variable control.   The grain dryer according to claim 1, wherein the control unit rotates the feeding valve with a rotation angle width smaller than that of the straw when the acquired grain type is beans or buckwheat.   2. The grain dryer according to claim 1, wherein the control unit rotates the feeding valve while gradually decreasing the rotation angle width in accordance with the progress of drying from the start of drying.   The said control part sets the said rotation angle width | variety to the maximum, and rotates the said delivery valve | bulb, when discharging | emitting the said grain outside a machine, The any one of Claims 1-3 characterized by the above-mentioned. The grain dryer according to item.