JPS63315882A - Drying controller for cereal 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 (Field of Industrial Application) The present invention relates to an improvement in a grain dryer that dries grain with hot air while circulating inside the machine.

(Prior Art) As this type of apparatus, one is known in which hot air from a burner is supplied to a drying chamber by an exhaust fan, and grains passing through the drying chamber are dried. and.

During the drying period, the moisture value is measured with a moisture meter, and the rate of change of the moisture value per unit time (hereinafter referred to as the drying loss rate) is calculated, and the calculated drying rate is based on a predetermined standard. Burner combustion is controlled to match the drying rate.

(Problems to be Solved by the Invention) When performing drying rate control in this manner, no particular problem occurs when the moisture value measured at moisture λ1 and the calculated drying rate are normal.

However, due to a failure in the mechanical system or electrical system of the moisture meter, the above-mentioned ΔIll constant moisture value and calculated drying loss rate may become abnormal. In such a case, it is not preferable to continue controlling the drying rate, and if this continues, there is a problem of deterioration of grain quality.

Therefore, in the present invention, when the calculated drying rate becomes abnormal,
The purpose is to prevent harmful effects caused by burner combustion, thereby preventing deterioration of grain quality due to drying rate control.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, the moisture value of the grain during drying is measured with the moisture meter 20, and the drying rate is calculated based on the temporal change in the moisture value, and the calculated drying rate matches a predetermined standard drying rate. In the grain dryer which controls the combustion of the burner 10, the permissible range setting means A sets the permissible range of the calculated drying loss rate based on the reference drying loss rate.

Determining whether the calculated drying loss rate is within the acceptable range,
and a burner control means B that stops the operation of the burner 10 when the burner 10 is out of the permissible range.

(Function) Now, when the dryer starts drying the grain, the moisture meter 20 detects the grain moisture at predetermined time intervals, and the drying loss rate is calculated from the moisture value.

Then, the burner control means B adds i1 to determine whether or not this calculated drying rate is within the tolerance range set by the tolerance range setting means A, and when it is outside the tolerance range, performs the operation on the eighth 10. stop.

Thereby, it is possible to prevent harmful effects caused by combustion in the burner 10 when drying rate control is impossible.

(Example) An example of the present invention will be described below with reference to the drawings (y, 4).
)do.

Figure 2 is a schematic cross-sectional view of the grain dryer in which Unreleased II was carried out. The grain chamber 3 is formed by each grain flow board 2, which is installed at an angle so as to become narrower.

Two mesh plates 4 are connected in parallel to each lower side of the floating grain plate 2,
A drying chamber 5 is formed between them. Then, a hot air chamber 6 in which a burner 10 as a drying heat source is installed is formed between two inner mesh plates 4 provided near the center of the storage chamber l, and a hot air chamber 6 in which a burner 10, which is a drying heat source, is installed is formed between the two outer mesh plates 4. An exhaust chamber 8 is formed between the machine wall 7 and the
It is connected to the exhaust fan 9 of the exhaust chamber 8.

Reference numeral 11 denotes a grain collection room formed in the shape of a gutter, and a lower helix 12 is installed at the bottom of the grain collection room, 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 an upper helix 15 installed on the ceiling of the storage chamber 1, and the outlet of this upper helix 15 looks into the storage chamber 1.

20 is a moisture meter that measures the moisture content (moisture) of grains during drying, and is installed, for example, in the grain room 3.

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 humidity sensor attached to the aircraft wall 7 to measure the outside air humidity.

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 exhaust chamber 8;
5 is a hot air temperature sensor installed in the hot air chamber 6. 25 again
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 block diagram 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 controls each component according to a predetermined procedure as described below.

Reference numeral 31 is a manual operation setting device that includes, for example, a drying button, a tensioning button, a discharge button, a stop button, a finishing moisture setting switch for setting the moisture when stopping drying, etc.
It is connected to the CPU 30 via an input circuit 32. In addition, the moisture meter 20 and each sensor 21 to 25 are connected to the A/D converter 33.
It is connected to the CPU 30 via.

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

36 is a memory consisting of a lead-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 device.

37 to 39 are output circuits connected to the CPU 30, respectively. 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 and a fuel valve 21 are connected to the output circuit 39.

Next, an example of the operation of the embodiment of the present invention configured as described above will be explained with reference to a flowchart.

Now, when the drying button arranged on the operation input setting device 31 is pressed, the grains in the storage chamber 1 are guided to the drying chamber and drying is started (step St).

Next, the grain moisture is detected at predetermined intervals using the moisture meter 20, and the drying loss rate R is calculated from the moisture value (step 52).
~S4).

Next, it is determined whether the calculated drying loss rate R corresponds to any of the following formulas (1) to (3) (steps S5 and S6).
.

α1 <R<α2(1) βl <R<α1 or α2×R×β2(2)R×βl
or R>β2(3) where αl, α2. βl.

The relationship of β2 is illustrated in Figure 5, and these values are ;! l! i Set in advance based on the quasi-drying rate 0 For example, αl is a value of 90% of the standard drying rate, α2 is a value of 110% of the standard drying rate, and βl is 80% of the standard drying rate.
The value of β2 is 120% of the reference drying rate.

As a result of the determination, if the calculated drying rate R corresponds to formula (1) and falls within the first tolerance range (see Figure 5), the calculated drying rate R matches the standard drying rate. Controls combustion of burner 10.

Further, when the calculated drying rate R corresponds to equation (2) and falls within the second allowable range (see Fig. 5), the process proceeds to step S7 to reduce the amount of fuel supplied to the burner 10 to increase the combustion amount. decrease.

Furthermore, when the 'B drying loss rate R corresponds to equation (3) and does not belong to either the first or ft52 allowable@circle, then (
(See FIG. 5) The process moves to step s8, where combustion of the burner 10 is stopped and only the exhaust fan 9 is rotated for a predetermined period of time to perform ventilation drying (step S9).

Next, the moisture meter 20 detects the grain moisture W2 again, and the moisture value (W-W2) is determined from the final moisture value W detected and stored in the final drying process, and the moisture difference is determined to be a predetermined value. (Step 5)
ll).

As a result, if the moisture difference is within a predetermined range, the operation of the dryer is stopped (step 512), and a message indicating that the drying control is abnormal is displayed on the display unit 34 (step 513).

On the other hand, when the moisture difference is outside the predetermined range, drying is restarted and the series of controls described above are performed.

In this way, when each process of steps SIO and Sll is included, when the accuracy of the drying loss rate H calculated in step S4 is low due to uneven moisture, the calculated drying loss rate is It is possible to prevent the problem of stopping the dryer due to a value outside the permissible range, and it is possible to perform more appropriate control.

(Effects of the Invention) As described above, in the present invention, the allowable range of the calculated drying loss rate is determined based on the standard drying loss rate, and when the calculated drying loss rate is outside the allowable range, the burner is However, since this operation is stopped, it is possible to prevent harmful effects caused by combustion in the burner when the calculated drying rate becomes abnormal, and this has the effect of preventing deterioration of grain quality due to drying rate control. .

Furthermore, in the present invention, failures in the mechanical system or electrical system of the moisture meter may be the cause of the calculated drying loss rate being outside the allowable range, but these failures can also be appropriately dealt with.

[Brief explanation of the drawing]

Fig. 1 is a functional diagram of the present invention, Fig. 2 is a schematic configuration diagram of a dryer to which an embodiment of the present invention is applied, Fig. 3 is a block diagram of an embodiment of the present invention, and Fig. 4 explains an example of its operation. The flowchart in FIG. 5 is an explanatory diagram of an example of its operation. 10 is a burner, 20 is a moisture meter, A is a tolerance setting means,
B is burner control means. Patent applicant: Iseki Okuki Co., Ltd. Agent: Rube Maki (and 2 others) Figure 1 Figure 2 Figure 5 01□・

Claims (1)

[Claims] A reference drying rate in which the moisture value of grains during drying is measured with a moisture meter, and the drying rate is calculated based on the temporal change in the moisture value, and the calculated drying rate is predetermined. In a grain dryer that controls combustion of a burner so as to match the standard drying ratio, the method further comprises: a tolerance setting means for setting an allowable range of the calculated drying ratio based on the reference drying ratio; Determine whether or not there is,
A drying control device comprising burner control means for stopping the operation of the burner when the temperature is outside the permissible range.