JP7287122B2 - grain drying equipment - Google Patents

Description

The present invention relates to grain drying equipment.

In a grain dryer, an air volume sensor is provided in a suspended state on the upper part of a burner body to constitute air volume detection means (Patent Document 1).

JP-A-8-128782

According to Patent Literature 1, in the case of drying grains while supplying hot air, it is possible to determine whether or not the heating temperature by the burner is in an appropriate combustion state with respect to the air volume detected by the air volume detecting means. However, when a plurality of grain dryers are installed and operated in a building, the air volume tends to fluctuate due to the operation of the exhaust fan of the adjacent dryer.

The present invention determines the impact of adjacent dryer operation and attempts to continue proper drying operation.

In order to solve the above problems, the present invention has taken the following technical means.

In the first present invention, a plurality of grain dryers (D1, D2, D3) are arranged from the near side to the far side from the air intake (63) in a building (H) in which the air intake (63) is provided, In a grain drying apparatus in which exhaust air guide ducts (55d1, 55d2, 55d3) from each grain dryer (D1, D2, D3) penetrate the building (H) wall and exhaust air out of the building (H) ,
Each grain dryer (D1, D2, D3) among the plurality of grain dryers (D1, D2, D3) is provided with an anemometer (65d1, 65d2, 65d3) for detecting a drying air volume, and an anemometer (65d1, 65d2, 65d3), calculate the reduced air volume (Δq1, Δq2, Δq3) with respect to the air volume (q0) at the set rotation speed of the exhaust fan (10) of each grain dryer (D1, D2, D3) based on the detected air volume. Each grain dryer (D1, D2, D3) is provided with a control unit (Sd1, Sd2, Sd3) for
The control units (Sd1, Sd2, Sd3) of the respective grain dryers (D1, D2, D3) are connected to the management terminals (T) to communicate the operation information of the respective grain dryers (D1, D2, D3). make it possible
When a certain grain dryer (D3) detects a drop in air volume, the influence of the operating conditions of the other grain dryers is determined, and the drop in air volume (Δq) is an allowable drop or an abnormality due to other causes. The grain drying apparatus is characterized in that it can be determined from the operation information of each of the grain dryers whether it is in a state of decrease.
The second aspect of the present invention is the first invention configured to control the rotational speed of the exhaust fan (10) to increase based on the decreased air volume (Δq1, Δq2, Δq3) of each of the grain dryers (D1, D2, D3). is the grain drying apparatus of the present invention.
The third aspect of the present invention is the first aspect of the present invention configured to control the combustion amount of the combustion burner (7) to decrease based on the decreased air volume (Δq1, Δq2, Δq3) of each of the grain dryers (D1, D2, D3). 1 is a grain drying apparatus of the present invention;
A first invention related to the present invention is a grain drying apparatus in which a plurality of grain dryers D1, D2, and D3 are arranged in a building H, wherein each grain in the plurality of grain dryers (D1, D2, D3) The dryers D1, D2 and D3 are provided with decompression detection means 64d1, 64d2 and 64d3, and based on the decompression detection of the decompression detection means 64d1, 64d2 and d3, the set rotation of the exhaust fan 10 of each grain dryer D1, D2 and D3 is controlled. It is provided with control units Sd1, Sd2, Sd3 for calculating decreased air volumes Δq1, Δq2, Δq3 with respect to the air volume q0 in numbers.

In a second invention related to the present invention , in the first invention related to the present invention , the number of rotations of the exhaust fan 10 is increased based on the reduced air volumes Δq1, Δq2, Δq3 of the grain dryers D1, D2, D3. configured to control.

In a third invention related to the present invention , in the first invention related to the present invention , the combustion amount of the combustion burner 7 is reduced based on the decreased air volumes Δq1, Δq2, Δq3 of the grain dryers D1, D2, D3. configured to control.

According to the present invention, the operator can appropriately determine the decrease in the drying air volume of each grain dryer D1, D2, D3.
According to the first invention related to the present invention , it is possible to calculate the reduced air volume Δq1, Δq2, Δq3 with respect to the air volume q0 at the set rotational speed of the exhaust fan 10 from the respective detection outputs of the pressure reduction detection means 64d1, 64d2, 64d3. , the operator can determine the decrease in the drying air volume of each of the grain dryers D1, D2, and D3.

According to the second invention related to the present invention, in addition to the effects of the first invention related to the present invention , the control units Sd1, Sd2, Sd3 calculate the decreased air volumes Δq1, Δq2, Δq3, and based on the values Since the number of revolutions of the exhaust fan 10 is controlled to increase by controlling the rotation speed of the exhaust fan 10, a proper drying operation can be performed by controlling the increase of the reduced drying air volume.

According to the third invention related to the present invention , in addition to the effects of the first invention related to the present invention , the control units Sd1, Sd2, Sd3 calculate the decreased air volumes Δq1, Δq2, Δq3, and based on the values Since the combustion amount of the combustion burner 7 is controlled so as to decrease, the proper drying operation can be performed under the combustion amount corresponding to the drying air amount.

1 is a perspective view of a grain dryer located in a building; FIG. It is a front sectional view of a grain dryer. Fig. 2 is a sectional side view of a drying chamber and a grain collecting chamber of the grain dryer; It is a control panel front view. It is a control block diagram. It is a flow chart. It is a combustion amount-fan rotation speed relationship graph. It is a flow chart. It is a moisture value-virtual exhaust air absolute humidity relationship graph. (a) multiple grain dryer layout plan, (b) air velocity graph immediately before introduction of the dryer, (c) decompression status graph, and (d) loss air volume (decreased air volume) graph against exhaust fan rotation speed. It is a graph corresponding to the number of grain dryers in operation and the pressure reduction situation. It is a hot-air temperature fluctuation comparison diagram. It is a flow chart. It is a side view which shows a dryer and a dust collector connection state. 1 is a schematic diagram of a driving situation management system; FIG.

A grain dryer as an embodiment of the present invention will be described based on the drawings.

In the building H, a plurality of grain dryers D1, D2, and D3 (three in the example shown) are installed, which will be described in detail below.

Grain dryers D1, D2, and D3 have the same configuration, and a storage chamber 2 for storing grains from top to bottom, a drying chamber 3 for drying grains, and a grain collection chamber 4 are provided inside a box 1. .

An elevator 5 for raising grains and a burner case 6 are provided on the front side of the box 1, and a combustion burner 7 for generating hot air is provided in the burner case 6. - 特許庁An exhaust duct 9 communicating with an exhaust chamber 8 is provided on the rear side of the box 1, and an exhaust fan 10 is provided on the rear side surface of the exhaust duct 9. - 特許庁One end start side of the exhaust air return duct 11 is connected to the upper surface of the exhaust fan 10 , and the other end end side of the exhaust air return duct 11 is connected to the box 1 . The exhaust air inlet 12 of the exhaust air return duct 11 communicates with the inside of the exhaust fan 10, and the exhaust air supply port 13 on the terminal side communicates with the upper rear portion of the hot air chamber 14 described later.

An upper spiral gutter 15 for laterally conveying the grains lifted by the elevator 5 is provided on the upper part of the box 1. - 特許庁

In the drying chamber 3 below the storage chamber 2, a pair of grain flow-down passages 19 having a Y-shaped cross section are formed to further divide the grains in the left and right storage chamber 2 into left and right. In the upper half of the drying chamber 3, a pair of left and right auxiliary exhaust chambers 8a are formed on the upper side. A hot air chamber 14 is provided in the left-right central portion of the drying chamber 3, and a far-infrared radiator 16 is provided inside the hot air chamber 14 so as to extend in the front-rear direction. The grain flow-down passages 19, 19 through which the grains flow down are arranged on both left and right sides of the hot air chamber 14, and exhaust chambers 8, 8 are provided on the left and right outer sides of the grain flow-down passages 19, 19.例文帳に追加

A rotary valve 17 for feeding grain is provided at the left and right confluence portion at the lower end of the grain flow-down passage 19 , and a lower spiral 18 for conveying the grain to the elevator 5 is provided below the rotary valve 17 .

The burner case 6 is formed with a large number of outside air intake slits for taking in outside air. The combustion burner 7 is equipped with an intermittent combustion gun type burner 7 in this embodiment.

The exhaust fan 10 includes rotary blades 20 rotating in an outer cylinder 24 by a horizontal axis of rotation 20a extending in the front-rear direction, fixed blades 21 for rectifying the exhaust air discharged from the rotary blades 20, and rotary blades. 20, and an exhaust air guide plate 22 for guiding the exhaust air discharged by the rotor blades 20 to the exhaust air return duct 11 side.

The fixed blades 21 are positioned behind the rotary blades 20 on the exhaust side, and have twisted exhaust air rectifying surfaces on both left and right sides. The outer end of the fixed wing 21 is attached to the outer cylinder 24 and the inner end of the fixed wing 21 is attached to the inner cylinder 25 .

An exhaust air control valve 26 is provided in the exhaust air return duct 11 for increasing or decreasing the amount of exhaust air flowing into the exhaust air return duct 11 . The exhaust air control valve 26 is configured to be able to adjust the rotation angle about the horizontal axis in the left-right direction by the exhaust air control valve motor 27 (return exhaust air amount adjusting means). The exhaust air return duct 11 includes a first duct portion 11 a extending upward from the upper surface of the exhaust fan 10 and a second duct extending in the front-rear direction connecting the upper end portion of the first duct portion 11 a and the rear surface of the box 1 . 11b, and an exhaust control valve 26 is provided in the first duct portion 11a. The second duct portion 11b is configured such that the opening area is gradually enlarged in a forward-broadening manner.

The far-infrared radiator 16 is composed of a large-diameter first cylindrical portion 30 and a small-diameter second cylindrical portion 31 . The rear portion of the first cylindrical portion 30 is configured as a constricted portion 30a, which is connected to the constricted portion via the bent portion on the starting end side, guides the second cylindrical portion 31 upward, and is folded back and connected to the front side. Both the first cylindrical portion 30 and the second cylindrical portion 31 are hollow, and the second cylindrical sea bream 31 is arranged above the first cylindrical portion 30 in parallel with the front-rear direction via a predetermined space.

The front end opening of the first cylindrical portion 30 is arranged to face the combustion portion of the combustion burner 7, the front end of the second cylindrical portion 31 is closed with a plate, and the left and right sides are located at the front lower portion, which is the terminal end side of the second cylindrical portion 31. Openings 31a are provided at predetermined intervals.

An operation panel U having a built-in control unit S is provided on the front side surface of the burner case 6 . On the front side of the operation panel U, as shown in FIG. 3, operation switches such as a loading switch 32, a ventilation switch 33, a drying switch 34, a discharge switch 35, and a stop switch 36 are provided. In addition, a liquid crystal operation display panel 45 is provided for sequentially switching displays of hot air temperature, measured moisture value, and remaining time until the end of the drying operation.

In addition, a charging amount switch 37 for setting the charging amount, a moisture setting switch 38 for setting the target moisture value to be reached, a setting display panel 39 for displaying the setting values of the charging amount switch 37 and the moisture setting switch 38, setting A numerical value increase/decrease switch 40 for changing the setting value of the display panel 39 is provided. A grain setting switch 41 for setting the grain type to be dried and a drying speed setting switch 42 for setting the drying speed are also provided.

A hot-air temperature sensor 43 for detecting the temperature inside the hot-air chamber 14 is provided in the hot-air chamber 14, and an outside air temperature sensor 44 for detecting the outside air temperature is provided at an appropriate place on the operation panel U. As shown in FIG.
As shown in FIG. 5, various switches and sensors are connected to the input side of the controller S via an input interface, and various motors and driving means are connected to the output side via an output interface.

Next, the grain drying operation will be briefly described with reference to the flow chart of FIG.

When the operator turns on the stocking switch 32, the elevator 5 and the upper spiral 15 are driven to sequentially stock the stocked grains into the storage chamber 2.例文帳に追加When the charging operation is completed, the operator sets the amount of grains to be charged with the charging amount switch 37, sets the target moisture value (for example, 14%) with the moisture setting switch 38, and uses the grain setting switch 41 to set the target moisture content. The grain is set, and the drying speed is set with the drying speed setting switch 42 (S101).
Next, when the drying switch 34 is turned ON (S102), the drying operation is started, and the circulation system of the rotary valve 17, the lower spiral 18, the elevator 5, and the upper spiral 15 starts to drive (S103), and the combustion burner 7 burns. is started (S104).

The hot air generated by the combustion burner 7 passes through the interior of the far-infrared radiator 16 by the suction action of the exhaust fan 10, and passes through the openings 31a, 31a, . . . Flow into 14. Then, the hot air flows from the hot air chamber 14 into the grain flow-down passage 19 formed of a net and acts on the grain. The hot air that has dehydrated the grains flows into the exhaust chamber 8, then passes through the exhaust duct 9 and is discharged outside the machine by the exhaust fan 10. - 特許庁A part of the exhaust air with heat and moisture is supplied to the hot air chamber 14 through the exhaust air return duct 11 and reused for the drying operation. The grains are dried by hot air, the action of far infrared rays emitted from the far infrared radiator 16, and the exhaust air returned from the exhaust air return duct 11. - 特許庁

Further, referring to FIG. 6, the controller S reads switch operation information and sensor detection information (S105), executes combustion amount control operation (S106), and executes the exhaust control valve control means A at the same time. (S107). Drying is controlled normally, and when the moisture value detected by the moisture meter 54 falls below the preset finish moisture value (S108), the motors of each part are stopped to complete the drying (S109).

Here, the burner combustion amount control will be described.

The combustion burner 7 of the present embodiment is a so-called gun-type burner, in which combustion air is supplied by a burner blower fan 52, fuel drawn out from a fuel tank (not shown) by a pump 50 is sprayed from a nozzle 49, and an igniter Ignite and burn at 51. The amount of fuel supplied from the pump 50 to the combustion burner 7 can be controlled by the proportional control valve 53. The grain type, the difference between the drying speed preset by the setting switch 42 and the actual drying speed, the outside air temperature etc., the controller S calculates the required combustion amount of the burner every predetermined unit time, calculates the fuel supply amount corresponding to this calculation, and outputs a fuel supply amount command signal to the proportional control valve 53. . Note that the combustion burner 7 uses the fuel supply amount Fa (liters/hour) set in advance according to the performance specific to the equipment as a reference, and when a larger fuel supply amount than this is required, the proportional control valve Based on the control signal applied to 53, the necessary fuel supply amount Fb is calculated (proportional combustion operation). However, when less than the reference fuel supply amount Fa is required, the combustion burner 7 is switched to a so-called intermittent combustion operation in which the combustion process and the combustion stop process are alternately performed. By setting the period T (for example, 60 seconds) between the combustion process and the stop process in the intermittent combustion operation to be constant and changing the combustion process time Tb and the stop process time Ts, it is possible to adjust the combustion state below the reference fuel supply amount Fa. It is configured.

As shown in an example of the combustion amount-fan rotation speed relationship graph in FIG. It is configured to be controlled. Further, during the intermittent combustion operation, in the combustion process, the rotation is controlled by selecting the lowest rotation speed Ra in the combustion amount-fan rotation speed table. In the stop step of the intermittent combustion operation, the rotation speed is selected in advance so that the burner blower fan 52 is continuously rotated during the intermittent combustion operation. Note that the fan rotation speeds in the combustion process and the stop process in the intermittent combustion operation may be the same or different.

Next, the return exhaust air amount adjustment control means will be described based on the flow chart of FIG. Based on the knowledge that the exhaust air return amount by the exhaust air control valve 26 can be calculated from the exhaust air absolute humidity, and that there is a close relationship between the virtual exhaust air absolute humidity and the moisture value as shown in FIG. In the example, the virtual exhaust air absolute humidity is obtained from the detected moisture value, and the necessary exhaust air return amount is calculated from the virtual exhaust air absolute humidity (S201 to S203). As a result, it is determined whether or not the current position (angle) of the exhaust air control valve 26 needs to be corrected (S204). Output is made to rotate the exhaust control valve motor 26m forward (S206). If it is determined in S205 that correction for reducing the exhaust air return amount is necessary, an output is issued to reverse the exhaust air control valve motor 26m (S207). Although not shown, it is assumed that neither forward rotation nor reverse rotation is required, and in this case, forward and reverse output to the exhaust control valve motor 26m is not output.

The exhaust air control valve 26 is regulated and controlled in relation to the absolute humidity of the exhaust air as in the above example. , outside air temperature, and other conditions. For example, at the beginning of drying, the ratio of the exhaust air from the machine to be returned to the exhaust return duct 11 side is increased in order to raise the grain temperature, and as the drying operation continues, the moisture value measured by the moisture meter 53 decreases. For example, the exhaust air control valve 26 is controlled such that the ratio of returning to the air return duct 11 side is gradually decreased, and almost all of the exhaust air is discharged out of the apparatus when the target moisture value is approached.

In the present embodiment, even when the exhaust air control valve 26 is fully open, that is, even when the largest amount of exhaust air is supplied to the hot air chamber 14 via the exhaust air return duct 11, the exhaust air does not flow through the slit of the exhaust air guide plate 22. 22a or between the fixed blades 21 where the exhaust guide plate 22 is not attached, the ratio of the return exhaust air supplied to the hot air chamber 14 is about 40% of the total external exhaust air volume. is.

Moisture content detection by the moisture meter 54 is configured to be capable of measuring a single grain, and is configured to determine the moisture distribution for each predetermined number of grains. Then, the water content variation of a predetermined number of grains, for example, the water content distribution width is determined to determine the size of the variation. It is configured to correct the standard exhaust air return amount by a predetermined amount less. With this configuration, it is possible to prevent condensation from occurring due to an excessive return amount of exhaust air. An example is shown in FIG. 9, the standard line targets grains with no moisture variation or less than a predetermined amount, and as shown by small variation (dotted line) and large variation (one-dot chain line), the larger the variation, the more virtual exhaust wind Absolute humidity is corrected on the lower side.
The wall of the building H is provided with an intake port 63 . When the operation of the grain dryer D1, D2 or D3 is started in the building H, outside air is taken in from the outside air intake port of the burner case 6 by the suction action of the exhaust fan 10, that is, outside air is introduced from the intake port 63. Exhaust air from the grain dryers D1, D2 or D3 is discharged outside the building H through exhaust air guide ducts 55d1, 55d2 and 55d3 penetrating the wall of the building H for each grain dryer D1, D2 or D3. By the way, while the grain dryers D1, D2 or D3 are in operation, when outside air is introduced from the outside air intake of the burner case 6 of the grain dryers D1, D2 or D3 in the building H, the single grain dryer is operated. There is no effect when multiple grain dryers are operated, but there is an effect on the flow rate, pressure, and amount of air introduced from the outside air intake. For example, if the grain dryer D1 is closest to the intake port 63, followed by the grain dryer D2, and farthest by the grain dryer D3, the outside air is supplied to the grain dryers D1, D2, and D3 in this order. easier to take in. That is, assuming that the grain dryers D1, D2, and D3 are installed in this order from the side closest to the intake port 63, and that all of these are in operation, as shown in FIG. The air flow velocity immediately before the introduction is least affected by the grain dryer D1 near the intake port 63, so the flow velocity (Vd1) is substantially close to the standard flow velocity (Vd). Grain dryer D3 is slowest in order of the farthest distance (Vd2≈Vd-v2, Vd3≈Vd-v3, v2<v3) ((b) in the figure). Presumed from this tendency, the state of pressure reduction Δp from the atmospheric pressure is highest on the side near the intake port 63, and decreases in the order of grain dryer D2 and grain dryer D3 (Δp1>Δp2>Δp3) (Fig. (C)), the amount of introduced air loss Δq for 10 rotations of the exhaust fan increases in order from the grain dryer D1 to the grain dryers D2 and D3 (Δq1<Δq2<Δq3) ((D) in the figure).

In view of the above tendency, pressure reduction detection means 64d1, 64d2, 64d3, for example, anemometers 65d1, 65d2, 65d3 are installed at appropriate locations in the building H or at appropriate locations in each of the grain dryers D1 to D3, and the detection output is controlled by the control unit Sd1, Arithmetic processing is performed at Sd2 and Sd3 to calculate pressure reductions Δp1, Δp2 and Δp3. That is, the pressure reduction Δp1 with respect to the set air volume p0 of the exhaust fan 10 (when a grain dryer having the same capacity for D1, D2, and D3 is installed) is detected by the respective detection outputs p1, p2, and p3 of the anemometers 65d1, 65d2, and 65d3. (=p0-p1), Δp2 (=p0-p2) and Δp3 (=p0-p3) can be calculated. From this decompression state, it is possible to calculate the introduced air loss amounts Δq1, Δq2, Δq3 with respect to the set rotational speed of the exhaust fan 10, in other words, the reduced air volume with respect to the set air volume.

Since the reduced air volume Δq1, Δq2, Δq3 with respect to the set air volume q0 of the exhaust fan 10 can be calculated from the detection outputs of the anemometers 65d1, 65d2, 65d3, the operator can determine the drying air volume of each grain dryer D1, D2, D3. Decrease can be determined.

By the way, the operating conditions of the grain dryers D1, D2, and D3, which are installed in a plurality, affect the pressure reduction values of adjacent grain dryers, and as shown in FIG. When the pressure reduction values Δp1, Δp2, and Δp3 are set, the grain dryer D1 is turned off and the grain dryers D2 and D3 are turned on. 11(b), the state is substantially the same as the state in which .DELTA.p1 and .DELTA.p2 are translated as indicated by the dashed line in FIG. 11(b). Further, the decompression conditions Δp1″ and Δp3″ when the operation of the grain dryer D2 is turned off and the grain dryers D1 and D3 are turned on are Δp1″≈Δp1 as shown by the two-dot chain line in FIG. , Δp3′<Δp3″<Δp3. The decompression conditions Δp2 and Δp3 when the operation of the grain dryer D3 is turned off and the grain dryers D1 and D2 are turned on are approximately equal to the decompression line L when the whole grain dryers D1, D2 and D3 are turned on. A matching relationship is obtained (dotted line in FIG. 11(a)).

Therefore, the influence of the operating conditions of the other grain dryers can be determined by the pressure reduction detection means 64d1, 64d2, and 64d3 provided in each of the grain dryers D1, D2, and D3.

In addition, the control units Sd1, Sd2, and Sd3 provided in the grain dryers D1, D2, and D3, respectively, can communicate with each other whether or not the adjacent grain dryers are in an operating state. It is possible to determine whether the air volume drop Δq of the machine is in a permissible state or in an abnormal state due to some other cause.

Control units Sd1, Sd2, and Sd3 provided in grain dryers D1, D2, and D3, respectively, calculate the introduced air loss amount, that is, the reduced air volume Δq1, Δq2, and Δq3, and adjust the rotation speed of the exhaust fan 10 based on the calculated value. It is configured to control the rise. With this configuration, proper drying operation can be performed by increasing the reduced amount of drying air.

Also, the combustion amount of the combustion burner 7 is reduced based on the value of the reduced air amount Δq. With this configuration, proper drying operation can be performed by controlling the amount of combustion corresponding to the amount of drying air.

The decompression detection means 64d1, 64d2, 64d3 can improve the accuracy of the decompression detection and thus the accuracy of the calculation of the decrease in air volume by taking into consideration the atmospheric pressure when calculating with the anemometers 65d1, 65d2, 65d3.

Further, as the decompression detection means 64d1, 64d2, 64d3, the following air volume reduction determination means 56 can be used in addition to the method of calculating by the anemometers 65d1, 65d2, 65d3. In other words, referring to FIG. 12, the vertical axis represents the temperature level, and the horizontal axis represents the inside of the hot air chamber 14 viewed from the side. , and a line H2 showing the temperature distribution when the air volume is reduced. The temperature at the rear portion of the hot-air chamber 14 is high at the standard line H1, and at H2, the temperature at the rear portion of the hot-air chamber 14 is low and the temperature at the front portion of the hot-air chamber 14 is rising due to the decrease in air volume. indicates

That is, a front hot-air temperature sensor 43f arranged on the inlet side, a rear hot-air temperature sensor 43r arranged on the outlet side, and an outside air temperature sensor 44 are provided. Regarding Tfo and Tro, an air volume reduction determination means 56 is provided for outputting a determination result of air volume reduction when the reference ratio Po=Tro/Tfo of the external hot air temperature detected by both hot air temperature sensors is equal to or less than a predetermined reference value αo.

It should be noted that the air volume reduction determining means 56 can also determine the air volume reduction when the reference ratio P=Tr/Tf, excluding the outside air temperature, is equal to or less than a predetermined reference value α.

In addition to the above, the air volume reduction determining means 56 may be in the form of an air pressure sensor composed of a sensing actuator and a potentiometer.

According to the air volume reduction judging means 56, since the reduced air volume is calculated from the state of the hot air flowing through the drying chamber 3, the air volume reduction can be detected more appropriately.

Next, a configuration in which a common dust collector is connected to the grain dryer will be described with reference to FIG. Exhaust air guided from a collective duct 55T in which the exhaust air guide ducts 55d1, 55d2, and 55d3 of the grain dryers D1, D2, and D3 are collected is generated by mist generating means 58 configured at the inlet of the dust collector 57. The dust contained in the mist is collected, the dust-removed exhaust air is released from the air discharge port 59, and the collected dust falls into the water tank at the bottom. An air volume detection means 60 is arranged in the middle of the collecting duct 55T. When the air volume detected by the air volume detection means 60 fluctuates, it can be determined that the following situations occur. For example, the number of operating grain dryers D1, D2, and D3 is confirmed, and the number of revolutions of the inverter-equipped dust collecting fan 61 is controlled so as to maintain the optimum air volume.

Further, when the dust collector 57 is operated in conjunction with the drying work, the air volume detection means 60 in the exhaust air guide duct 55 can detect a predetermined air volume. If a problem occurs on the 57 side and smooth exhaust air circulation is hindered, the air volume will decrease, and the air volume detection means 60 will output a decrease in air volume. In such a case, as in the case of a decrease in air volume in the hot air chamber 14, by performing exhaust air control valve control and drying control corresponding to a decrease in air volume, it is possible to prevent problems caused by returning an excessive amount of exhaust air into the dryer main body. , it is possible to continue proper drying work. The air volume detection means 60 may be in the form of an air pressure sensor comprising, for example, a sensing actuator and a potentiometer.

FIG. 15 shows an operation information management system capable of exchanging information of control units Sd1, Sd2 and Sd3 provided in grain dryers D1, D2 and D3, respectively. It is possible to confirm operation information such as operation progress information and grain moisture information from the grain dryers in the ON state, information on the number of operating grain dryers D1, D2, and D3 indicating whether or not they are in operation.

A management portable terminal T such as a tablet and the control units Sd1, Sd2 and Sd3 are provided so as to be able to communicate with each other by short-range wireless communication means. The control units Sd1, Sd2, and Sd3 connected to the management terminal T are sequentially selected, and the operation information is collected for each grain dryer.

The operation information of the plurality of grain dryers D1, D2, and D3 input to the management mobile terminal T is transmitted to the mobile terminals W1 and W2 carried by the workers via a wireless communication line M such as the Internet. By using such an operation information management system, the operation information of the plurality of grain dryers D1, D2 and D3 can be acquired at remote locations.

9 Combustion burner 10 Exhaust fan 64d1 Pressure reduction detection means 64d2 Pressure reduction detection means 64d3 Pressure reduction detection means D1 Grain dryer D2 Grain dryer D3 Grain dryer H Building Sd1 Control unit Sd2 Control unit Sd3 Control unit q0 Set air volume Δq1 Reduced air volume Δq2 Decrease Air volume Δq3 Decreased air volume

Claims (3)

A plurality of grain dryers (D1, D2, D3) are arranged in a building (H) in which an air intake (63) is provided, from the side closer to the air intake (63) toward the far side , and each grain dryer (D1, D2, D3), respectively, exhaust air guide ducts (55d1, 55d2, 55d3) penetrate the wall of the building (H) and discharge the exhaust air outside the building (H),
Each grain dryer (D1, D2, D3) among the plurality of grain dryers (D1, D2, D3) is provided with an anemometer (65d1, 65d2, 65d3) for detecting a drying air volume , and an anemometer (65d1, 65d2, 65d3) , calculate the reduced air volume (Δq1, Δq2, Δq3) with respect to the air volume (q0) at the set rotation speed of the exhaust fan (10) of each grain dryer (D1, D2, D3) based on the detected air volume. Each grain dryer (D1, D2, D3) is provided with a control unit (Sd1, Sd2, Sd3) for
The control units (Sd1, Sd2, Sd3) of the respective grain dryers (D1, D2, D3) are connected to the management terminals (T) to communicate the operation information of the respective grain dryers (D1, D2, D3). make it possible
When a certain grain dryer (D3) detects a drop in air volume, the influence of the operating conditions of the other grain dryers is determined, and the drop in air volume (Δq) is an allowable drop or an abnormality due to other causes. A grain drying apparatus characterized in that it is configured such that it is possible to determine whether or not it is in a state of decrease from the operation information of each of the grain dryers . 2. The grain drying apparatus according to claim 1, wherein the rotation speed of the exhaust fan (10) is controlled to increase based on the decreased air volume ([Delta]q1, [Delta]q2, [Delta]q3) of each of the grain dryers (D1, D2, D3). . 2. The grain drying apparatus according to claim 1, wherein the combustion amount of the combustion burner (7) is controlled to decrease based on the decreased air volume ([Delta]q1, [Delta]q2, [Delta]q3) of each of the grain dryers (D1, D2, D3).

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