JPH0650225B2 - Drying controller for grain dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a grain dryer for drying grains such as paddy with hot air while circulating the inside of the machine, and particularly to improvement of a drying control device thereof.

(Prior Art) When, for example, paddy is dried with a grain dryer, the harvested paddy is put in a storage chamber and then the paddy is introduced into the drying chamber.

By the way, due to the impact at the time of harvesting, the impact of transporting the harvested paddy from the harvesting place to the dryer, or the friction when the paddy is put in the storage chamber and circulated inside the paddy for drying, Often, a part of the rice leaves to become brown rice.

(Problems to be solved by the invention) However, conventionally, the hot air temperature of the burner is set without considering the situation where brown rice is mixed in the paddy as described above, that is, the removal rate is not taken into consideration. The fuel valve of the burner was controlled so that Therefore, the brown rice mixed in the paddy may cause a problem that cracks easily occur during drying.

In order to solve this problem, an object of the present invention is to investigate the desorption rate of grain and set an appropriate hot air temperature based on the result of the investigation, thereby preventing cracking of brown rice during drying. Especially.

(Means for Solving Problems) In order to achieve such an object, the present invention provides a removal rate determination unit A for determining the size of the removal rate of grain and a determination result of the removal rate determination unit A. The hot air temperature setting means B for setting the hot air temperature of the drying heat source D in the dryer to a predetermined value, and the hot air temperature determined by the hot air temperature setting means B,
And a dry heat source control means C for controlling the dry heat source D.

(Operation) In the present invention, for example, the operator compares the inspection sample taken out from the dryer with each of the standard samples 52 to 54, and selects the closest standard sample from them. Then, the removal rate of the barcode form according to the standard sample is determined by the barcode sensor 50.
Read it.

When the escape rate is input in this way, the escape rate determining means A
Determines its withdrawal rate. Then, according to the determination result, the hot air temperature setting means B sets the hot air temperature of the drying heat source D of the dryer to a predetermined value.

Thereby, the dry heat source control means C controls the dry heat source D so that the hot air temperature of the dry heat source D becomes the set value.

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

FIG. 2 is a schematic sectional view of a grain dryer in which the present invention is implemented. In the figure, reference numeral 1 denotes a storage chamber of a dryer, and two pairs of shed boards 2 are attached to the lower portion of the shed board so as to be inclined so that a space becomes narrower as it goes downward.
To form.

Two mesh plates 4 are connected in parallel to each lower side of the grain plate 2,
In the meantime, the drying chamber 5 is formed. Then, a hot air chamber 6 in which a burner 10 as a dry heat source is installed is formed between two inner mesh plates 4 provided near the center of the storage chamber 1, and the two outer mesh plates 4 and 4 and the left and right sides are formed. The air exhaust chamber 8 is formed between the machine wall 7 and
It is connected to the suction fan 9 of the exhaust chamber 8.

Reference numeral 11 denotes a gutter-shaped grain collecting chamber, in which a lower helix 12 is installed at the bottom thereof, and the end of the lower helix 12 is connected to the lower inlet of the elevator 13. Reference numeral 14 denotes a rotary valve which is axially supported at the outlet of the lower end of the drying chamber 5, and the rotation thereof causes the grains in the storage chamber 1 to flow out to the grain collecting chamber 11 via the drying chamber 5.

The upper outlet of the elevator 13 is connected to the upper helix 15 installed on the ceiling of the storage chamber 1, and the outlet of the upper helix 15 can be seen in the storage chamber 1.

Reference numeral 20 denotes a moisture meter for measuring the moisture content (moisture content) per grain of the grain being dried, which is installed in the grain shedding chamber 3. Reference numeral 21 denotes an outside air temperature sensor attached to the machine wall 7 to measure the outside air temperature, and 22 denotes an outside air humidity sensor attached to the machine wall 7 to measure the outside air humidity.

23 is a grain temperature sensor installed in the grain shedding chamber 3 to measure the temperature of the grain, 24 is an exhaust temperature sensor installed in the blast chamber 8, 2
Reference numeral 5 is a hot air temperature sensor installed in the hot air chamber 6. Again 26
Is a fuel pump for supplying fuel to the burner 10, and 27
Is a fuel valve for adjusting the fuel supplied to the burner 10.

FIG. 3 is a block diagram showing an example of the control system of the embodiment of the present invention.

In the figure, 30 is a microprocessor type CPU
It is a (central processing unit), and makes various judgments as shown in FIG. 5, for example, and controls each component as described later.

Reference numeral 31 is an operation input setting device having, for example, a dry button, a sticking button, a discharge button, a stop button, etc., and is connected to the CPU 30 via an input circuit 32. Also, a moisture meter 2
0 and each of the sensors 21 to 25 are connected to the CPU 30 via the A / D converter 33.

Reference numeral 34 denotes a display unit connected to the CPU 30 via the output circuit 35, and the display unit 34 performs various displays.

A memory 36 is composed of a read-only memory (ROM) that stores a control procedure 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 device.

Reference numerals 37 to 39 denote output circuits connected to the CPU 30, respectively. The output circuit 37 includes a carry motor 40, a heater 41,
The moisture meter motors 42 are respectively connected, the output circuit 38 is connected to the fan motor 43, and the output circuit 39 is connected to the fuel pump 26 and the fuel valve 27.

Reference numeral 50 denotes a bar code sensor which is detachably arranged on the operation panel like the operation input setting device. This barcode sensor 5
0 reads the printed bar codes 52A to 54A corresponding to the standard samples 52 to 54 color printed on the standard sample card 51 as shown in FIG.

The standard samples 52 to 54 are standards to be compared with the paddy taken out from the dryer as an inspection sample by the operator as described later, and correspond to the depletion rates of “small”, “medium”, and “large”. Standard samples 52, 53, and 54 are sequentially printed in color.

Reference numeral 55 denotes a loss rate sensor, which automatically takes out a predetermined number of paddy immediately after or during the drying of the paddy, and measures the proportion (release rate) of brown rice in the given amount of the paddy.

The standard sample card 51 may be fixed in advance at a predetermined position on the operation panel.

Next, an operation example of the embodiment configured as described above will be described with reference to the flowchart shown in FIG.

Prior to the control shown in FIG. 5, the operator takes out the paddy in the dryer and puts it in a prepared dish immediately after the start of drying or during the drying. Next, the operator visually compares the inspection sample with each of the standard samples 52 to 54 in the standard sample card 51. Then, the standard sample closest to the inspection sample is selected from among them, and the bar codes 52A to 54A corresponding thereto are read by the bar code sensor 50.

In this way, when the barcodes 52A to 54A are read by the barcode sensor 50 (step S1), the control according to the present invention is started, and the removal rates indicated by the read barcodes 52A to 54A are "small" and " Medium, large
It is determined which of the two is (step S2).

And the removal rate indicated by the barcode is "small", "medium"
The hot air temperature T of the burner 10 corresponding to "large" is set to T1, T2,
Each is set to T3 (steps S3 to S5). The relationship between the hot air temperatures T1, T2, and T3 is given by the following equation.

T1>T2> T3 (1) That is, the larger the removal rate, the larger the amount of brown rice in the mixed rice, and the brown rice is more likely to crack. Therefore, the hot air temperature T is set low.

Then, the fuel pump 26 and the fuel valve 27 are controlled so that the temperature of the hot air from the burner 10 becomes the above-mentioned set temperature (step S6).

As described above, according to this embodiment, when the removal rate is large, the set hot air temperature of the burner 10 is set to be low, so that a large amount of brown rice is contained in the dried paddy and cracking of the barrel is likely to occur. In this case, it is possible to prevent the body from cracking.

Next, an operation example of another embodiment of the present invention will be described with reference to the flowchart of FIG.

Prior to the control shown in FIG. 6, the operator takes out the paddy in the dryer immediately after the start of drying or during the drying, and visually compares the inspected sample with the standard samples 52 to 54. Then, the standard sample that most closely resembles the test sample is selected from among them, and the corresponding bar code 52A to
54A is read by the barcode sensor 50.

When the barcodes 52A to 54A are read by the barcode sensor 50 in this way (step S11), the control according to the present invention is started, and the moisture value at that time measured and calculated by the moisture meter 20 is read ( Step S1
2). Next, it is determined whether or not the removal rate and the water content are larger than the predetermined values (steps S13 to S1).
5).

When the removal rate is larger than a predetermined value and the water content at that time is larger than a predetermined value, the amount of brown rice in the paddy is large and there is a risk of causing cracks in the burner.
It is necessary to make the hot air temperature T of 0 relatively low, and at this time, the hot air temperature T is set to T4 (step S1).
9). When the desorption rate is higher than the predetermined value but the moisture value at that time is lower than the predetermined value, the hot air temperature T of the burner 10 is set to (T4 + ΔT) (step S1).
8). Here, ΔT indicates a minute amount.

On the other hand, when the removal rate is smaller than the predetermined value and the moisture value at that time is smaller than the predetermined value, the amount of brown rice in the paddy is small and there is no possibility of causing cracks in the burner.
The hot air temperature T of 0 may be relatively high, and at this time,
The hot air temperature T is set to T5 (step S17). When the desorption rate is smaller than the predetermined value but the moisture value at that time is larger than the predetermined value, the hot air temperature T of the burner 10 is set to (T5-ΔT) (step S16).

Therefore, the relationship between the hot air temperatures T4 and T5 is given by the following equation.

T4 <T5 (2) Then, the fuel pump 26 and the fuel valve 27 are respectively controlled so that the temperature of the hot air from the burner 10 becomes the above-mentioned set temperature (step S20).

As described above, according to this embodiment, when the removal rate is large and the moisture value at that time is large, the set hot air temperature of the burner 10 is set low, so that a large amount of brown rice is contained in the dry paddy. In addition, even if the water content of the whole paddy is large at that time and cracks easily occur, the cracks can be prevented.

In addition, in each of the above-described embodiments, the operator visually judges the removal rate based on the standard sample, and reads the bar code corresponding to the bar code with the bar code sensor 50 to input the bar code.
It is needless to say that the removal rate sensor 55 can be used instead, and in this case, the above work can be automated, which is extremely convenient.

(Effect of the invention) As described above, in the present invention, the removal rate is determined immediately after the start of drying of the grain or during the drying, and the hot air temperature of the burner, which is the drying heat source, is set according to the determined removal rate. Since the drying is performed at the set hot air temperature, there is an effect that the cracking of the barrel can be prevented in advance even when a large amount of brown rice is mixed in the dry paddy and cracking of the barrel is likely to occur. .

[Brief description of drawings]

FIG. 1 is a functional diagram of the present invention, FIG. 2 is a schematic sectional view of a dryer in which the present invention is implemented, FIG. 3 is a block diagram showing its control system, FIG. 4 is a plan view of a standard sample card, and FIG. FIG. 5 is a flow chart showing an operation example of the embodiment of the present invention, and FIG. 6 is a flow chart showing an operation example of another embodiment. A is a removal rate determination means, B is a hot air temperature setting means, C is a drying heat source control means, and D is a drying heat source.

Claims (1)

[Claims] 1. A removal rate determination means for determining the degree of removal rate of grain, and a hot air temperature setting for setting a hot air temperature of a drying heat source in a dryer to a predetermined value according to the determination result of the removal rate determination means. And a drying heat source control means for controlling the drying heat source so that the hot air temperature determined by the hot air temperature setting means is controlled.