JPS62276390A - Drying controller for cereal grain drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an improvement in a grain dryer that dries grain while circulating it inside the machine.

(Prior art) When harvested grains are dried using this type of device, the grains are placed in a storage chamber, then led to a drying chamber to be dried, and then returned to the storage chamber again. The grains are dried while being circulated.

During drying, the moisture value of the grain is measured with a moisture meter, the rate of change in the moisture value per unit time (hereinafter referred to as the drying rate) is detected, and this detected drying rate is compared to a predetermined standard drying rate. The hot air temperature is compared with the reduction rate, and the hot air temperature is set according to the comparison result so that the two match. Then, the heat amount of the burner, which is the drying heat source, was controlled so that the set hot air temperature was achieved.

(Problem to be Solved by the Invention) In this type of drying rate control, when the detected drying rate is lower than the standard drying rate, the hot air temperature is increased to perform drying. When the temperature is relatively high, such as 20°C or higher, increasing the hot air temperature improves drying efficiency, but on the other hand, the grain temperature tends to rise, and the quality of the grain deteriorates due to the increase in grain temperature. There is a problem with the decline.

On the other hand, when the detected drying rate exceeds the standard drying rate, the hot air temperature is lowered and drying is performed.
Since the grain temperature does not rise, the quality of the grains does not deteriorate, but there is a problem that the amount of heat discarded to the outside exceeds the limit and the drying efficiency deteriorates.

In this way, with conventional drying loss rate control, if drying is carried out by increasing the hot air temperature when the outside air temperature is relatively high during drying, there is a problem of deterioration in grain quality. When drying is performed by lowering the hot air temperature when the temperature is relatively low, there is a problem of deterioration of drying efficiency.

In order to solve these problems all at once, it is an object of the present invention to make it possible to change the drying air volume in addition to the hot air temperature in drying loss rate control, and to adjust the drying air volume to the outside air temperature at the time of the change. The purpose is to change either the hot air temperature or the drying air volume accordingly, thereby improving both grain quality and drying efficiency regardless of the outside air temperature during drying.

(Means for Solving the Problems) In order to achieve the above object, the present invention, as shown in FIG. a drying rate detecting means A for detecting the drying rate; a drying rate comparing means B for comparing the detected drying rate detected by the drying rate detecting means A with a predetermined reference drying rate; When the detected drying loss rate and the reference drying rate do not match as a result of comparison by the loss rate comparison means B, either the hot air temperature or the drying air volume is set to the current value according to the outside air temperature detected by the outside air temperature sensor 21. a change command means C that sends out a command to change the drying air temperature; a hot air temperature calculation means that receives the command to change the hot air temperature and calculates the target hot air temperature; a drying air volume calculation means G for calculating the air volume; a drying heat source control means E for controlling the combustion of the drying heat source F so as to achieve the target hot air temperature calculated by the hot air temperature calculation means; It is equipped with a suction fan control means H that controls the exhaust air volume of the suction fan 9 so that the calculated target dry air volume is achieved.

(Function) That is, in the present invention, the drying rate comparing means B compares the detected drying rate detected by the drying rate detecting means A with a predetermined reference drying rate.

As a result of the comparison, when the detected drying g rate and the reference drying rate do not match, the change command means C changes either the hot air temperature or the drying air volume to the current value according to the outside air temperature detected by the outside air temperature sensor 21. Sends a command to change the value.

For example, when the detected drying rate is lower than the target drying rate and the outside temperature is relatively high, the change command means C sends a command to increase the drying air volume. Upon receiving this command, the drying air volume calculating means G increases the current drying air volume to calculate the target drying air volume.

The suction fan control means H controls the exhaust air volume of the suction fan 9 so that the target dry air volume is achieved.

At this time, since the hot air temperature is not changed by the hot air temperature calculation means, the drying heat source control means E controls the combustion of the drying heat source F so that the current hot air temperature is maintained.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic cross-sectional view of a grain dryer embodying the present invention. Reference numeral 1 indicates a storage chamber of the dryer, and two pairs of flow grain plates 2 are installed at the bottom of the storage chamber so that the interval becomes narrower as it goes downward. The grain chamber 3 is formed by each grain board 2 and installed at an angle.

Two mesh plates 4 as perforated plates are connected in parallel to each lower side of the floating grain plate 2, and a drying chamber 5 is formed between them. and,
A hot air chamber 6 is formed in which a burner 10 as a drying heat source is installed between two inner mesh plates provided near the center of the storage chamber 1.
A ventilation chamber 8 is formed between two outer mesh plates 4.4 and left and right machine walls 7, and is connected to a suction fan 9 of the ventilation chamber 8.

Reference numeral 11 denotes a grain collection room formed in the shape of a gutter, on the bottom of which a cross-feeding helix 12 is installed, the end of which is connected to the lower entrance of the elevator 13. Reference numeral 14 denotes a rotary valve pivotally supported at the lower end outlet of the drying chamber 5, and its rotation causes the grains in the storage chamber 1 to flow out through the drying chamber 5 into the grain collection chamber 11.

The upper outlet of the elevator 13 is connected to a grain feeding helix 15 installed on the ceiling of the storage room 1, and the exit of this grain feeding helix 15 looks into the storage room 1.

Reference numeral 21 denotes an outside air temperature sensor attached to the aircraft wall 7 to measure the outside air temperature, and 22 an outside air temperature sensor attached to the aircraft wall 7 to measure the outside air humidity. In addition, 20 is a moisture value for measuring the moisture content (moisture value) of grains during drying, and
Installed inside.

23 is a grain temperature sensor installed in the grain flow chamber 3 to measure the temperature of the grain; 24 is an exhaust temperature sensor installed in the ventilation chamber 8;
5 is a hot air temperature sensor installed in the hot air chamber 6. Also 26
27 is a fuel pump that supplies fuel to the burner 10;
is a fuel valve that adjusts the fuel supplied to the burner 10.

FIG. 3 is a perspective view of a blower showing an example of a control system according to an embodiment of the present invention.

In the figure, 30 is a CPU in the form of a microprocessor.
(Central processing unit), which makes various judgments as shown in FIG. 4, for example, and controls each component as described later.

Reference numeral 31 denotes an operation input setting device on which, for example, a drying button, a tensioning button, an ejection button, a stop button, etc. are arranged, and is connected to the CPU 30 via an input circuit 32. Also, moisture meter 2
0 and each of the sensors 21 to 25 are connected to the CPU 30 via the A/D converter 33.

34 is a display section connected to the CPU 30 via an output circuit 35, and this display section 34 performs various displays.

36 includes a read only memory (ROM) that stores control procedures for the CPU 30 to control each component, and a random access memory (RAM) that temporarily stores various data such as measurement data. It is a storage device.

37 to 39 are output circuits connected to the CPU 30, respectively, and the output circuit 37 includes a transport motor 40, a heater 41,
A moisture meter motor 42 is connected to each, a fan motor 43 is connected to the output circuit 38, and a fuel pump 26 is connected to the output circuit 39.

Next, please refer to the flowchart in FIG. 4 for an example of the operation of the embodiment configured as described above. 1α and explain.

When drying is started, the grains packed in the storage chamber 1 are led to the drying chamber 5 and dried, and then returned to the storage chamber 1 via the elevator fi 13 and the like to be tempered.

Then, as shown in step S1 in FIG. 4, when the drying control according to the present invention is started, the moisture meter 20 is operated, and the current moisture value of the grain is detected from the measurement data of the moisture meter 20. (Step S2), and in Step S3, the measurement data of the outside air temperature sensor 21 is read and the outside air temperature is detected.

Next, in step S4, the drying ratio is determined from the moisture value detected in step S2 and the moisture value detected last time, and the detected drying rate is compared with a predetermined reference drying rate (step S5).

As a result of the comparison, if the detected drying rate is smaller than the reference drying rate, the process proceeds to step S7, and the outside air temperature detected in step S2 is determined to be, for example, 20"0 or higher.
It is determined whether the value is greater than or equal to a predetermined value.

When the outside air temperature is 20° C. or higher, the hot air temperature is not changed at the current temperature in step 312, and only the rotational speed of the suction fan 9 is increased in the next step S17 to increase the drying air volume. Therefore, the current value of the hot air temperature is set as the target, and the combustion of the burner lO, which is the drying heat source, is controlled so that the temperature measured by the hot air temperature sensor 25 matches the target value, and the rotation speed of the suction fan 9 is As the number of rotations of the fan motor 43 increases, the amount of exhaust air is increased to a predetermined value, and drying is performed with the amount of exhaust air increased.

On the other hand, when the outside air temperature is 20° C. or less in step S7, only the hot air temperature is increased from the current value to a predetermined value in step 311, and the rotation speed of the suction fan 9 is not changed in the next step 516, so that it is increased. The hot air temperature is set as a target value, and the combustion of the burner 10 is controlled so that the temperature measured by the hot air temperature sensor 25 coincides with the target value, and the drying is performed with the current rotational speed of the suction fan 9 unchanged.

By the way, as a result of the comparison in step S5, if the detected drying rate is larger than the reference drying rate, the process proceeds to step S6, and it is determined whether the outside air temperature detected in step S2 is greater than or equal to a predetermined value, such as whether it is greater than or equal to 20°C. Determine whether or not.

Then, when the outside temperature is 20°C or less, step S
10, do not change the hot air temperature as it is, and proceed to the next step 3.
In step 15, only the rotational speed of the suction fan is reduced in order to reduce the drying air volume. Therefore, the combustion of the burner 10 is controlled so that the hot air temperature remains at the current temperature, and only the number of rotations of the suction fan 9 is reduced to a predetermined value, so that drying is performed with the amount of exhaust air reduced.

On the other hand, when the outside air temperature is 20° C. or higher in step S6, only the hot air temperature is lowered from the current value to a predetermined value in step S9, and the rotation speed of the suction fan 9 is not changed in the next step S14, so it is lowered. Set the hot air temperature as the target value,
The combustion of the burner 10 is controlled so as to match the target value, and drying is carried out with the rotational speed of the suction fan 9 unchanged.

By the way, as a result of the comparison in step S5, if the detected drying rate is equal to the reference drying rate, the hot air temperature is not changed in step S8, and the rotation speed of the suction fan 9 is not changed in step S13. Leave it to dry.

In this way, in the embodiment of the present invention, in order to increase the drying loss rate, when the outside temperature is relatively high, for example, 20 degrees Celsius or higher, the rotation speed of the fan is increased to increase only the drying air volume, and on the other hand, When the outside air temperature is relatively low, such as 20° C. or less, only the hot air temperature is increased. Therefore, if the outside air temperature during drying is high, the increase in grain temperature can be suppressed and a decline in grain quality can be prevented, and the drying efficiency will not decrease. It also does not reduce grain quality and drying efficiency.

In addition, in the embodiments of the present invention, in reducing the dry g rate,
When the outside air temperature is relatively high, only the hot air temperature is reduced, and when the outside air temperature is relatively low, the fan rotation speed is reduced to reduce only the drying air volume. Therefore, if the outside temperature during drying is high, the increase in grain temperature can be suppressed to prevent a decline in grain quality, and the drying efficiency will not decrease. The amount of heat dissipated to the outside is suppressed and drying efficiency is improved.

In addition, in this example, when the detected drying rate does not match the reference drying rate, an example was explained in which outside air temperature is used as a factor to change either the hot air temperature or the drying air volume. As shown in FIG. 5, it is of course possible to use a grain temperature or exhaust temperature that is predetermined depending on the moisture value.

For example, as shown in Figure 5, when the moisture value is 25% or more, the grain temperature is set at 26°C, and depending on whether the measured value of the grain temperature sensor is 26°C or more or less, the hot air temperature or the drying temperature is set. Configure to change one.

(Effects of the Invention) As explained above, according to the present invention, it is possible to change the drying air volume in addition to the 8M temperature in the drying rate control, and when changing, the outside temperature state at that time is changed. Since either the hot air temperature or the drying air volume is changed depending on the drying process, both grain quality and drying efficiency can be improved regardless of the outside air temperature during drying.

[Brief explanation of the drawing]

Fig. 1 is a functional diagram of the present invention, Fig. 2 is a schematic configuration diagram of an embodiment of the present invention, Fig. 3 is a block diagram of its control system, Fig. 4 is a flowchart showing an example of its operation, and Fig. 5 is a water It is a graph which shows the relationship between a value, a set grain temperature, etc. 9 is a suction fan, 20 is a moisture meter, 21 is an outside temperature sensor,
A is a drying loss rate detection means, B is a drying loss rate comparison means, C is a change command means, D is a hot air temperature calculation means, E is a drying heat source control means, F is a drying heat source, G is a drying air volume calculation means, and H is a drying air volume calculation means. Suction fan control means. Patent applicant: Iseki Ichiki Co., Ltd. Agent: Tobe Maki (and 2 others) Figure 2

Claims (1)

[Scope of Claims] A drying rate detection means for detecting a drying rate based on a temporal change in the moisture value of grains measured by a moisture meter; A drying rate comparison means that compares the drying rate with a predetermined standard drying rate, and an outside temperature sensor detects when the detected drying rate does not match the standard drying rate as a result of the comparison by the drying rate comparing means. a change command means that sends a command to change either the hot air temperature or the drying air volume from the current value according to the outside air temperature; and a hot air temperature calculation unit that receives the command to change the hot air temperature and calculates a target hot air temperature. drying air volume calculating means for receiving a command to change the drying air volume and calculating a target drying air volume; and drying for controlling combustion of the drying heat source so as to reach the target hot air temperature calculated by the hot air temperature calculating means. A drying control device for a grain dryer, comprising: a heat source control means; and a suction fan control means for controlling the exhaust air volume of a suction fan so as to reach the target drying air volume calculated by the drying air volume calculation means.