JPS636381A - Cereal drier controller - 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 a grain dryer control device that is used in a dryer for drying grains such as rice and wheat and performs drying control.

[Conventional technology]

In order to dry grain in a grain dryer and to proceed with the work after drying as scheduled and to improve work efficiency, it is necessary to operate the dryer so that the finished time is at the scheduled time.

Therefore, conventionally, the drying time is calculated by dividing the difference between the initial grain moisture content Gl measured by a moisture meter and the target finishing moisture content Gf by the average hourly drying loss rate, and the scheduled finishing time is A timer is set to a time obtained by subtracting the current time and the drying time from t, and the dryer starts operating after the elapse of this time.

[Problem that the invention seeks to solve]

However, the operator needs to calculate the time to set the timer, and the drying rate is also affected by the amount of grain loaded into the grain dryer and the outside temperature. Because of the curved changes, it was difficult to complete drying within the scheduled finishing time.

In view of the above problems, the present invention allows the operator to
To provide a grain dryer control device capable of completing drying at a scheduled finishing time t without needing to calculate time.

[Means for solving problems]

In the present invention, in a grain dryer control device that sets or detects drying conditions for grains and dries the grains by blowing hot air onto the grains based on the drying conditions, finishing time and finishing moisture are set as drying conditions. and means for controlling the drying of the grain so that it reaches a set finishing moisture level at a set finishing time in accordance with the drying conditions.

[Effect]

The operator sets drying conditions such as finish time and finish moisture. Among the drying conditions that affect the drying time, the negative part is detected by a detector.

According to these drying conditions, the drying of the grain is controlled so that it reaches the set finishing moisture at the set finishing time, so that the finishing time approximately coincides with the set finishing time and the work after finishing is performed. It is possible to proceed as planned.

〔Example〕

Preferred embodiments of the present invention will be described according to the drawings.

FIG. 1 shows a longitudinal section and a control circuit of the circulating grain dryer W110, and FIG. 2 shows a cross section taken along the line r--■ in FIG.

As shown in Figure 1, the inside of the circulating grain dryer 1alO is as follows:
It can be roughly divided into an upper storage section 12 and a lower drying section 14, and grains 16 flow down from the storage section 12 to the drying section 14. A rotary valve 18 driven by a motor 17 is disposed below the drying section 14, and is configured to periodically drop the grains in the drying section 14 downward in fixed amounts each time. Below the rotary valve 18 is a screw conveyor 20 driven by a motor 19.
is arranged to convey the dropped grains to the side packet conveyor 22. The packet conveyor 22 is disposed on the side of the WiN type grain dryer 10 and lifts the transported grain above the circulation type grain dryer 10. , w1 A screw conveyor 24 is disposed at the top of the circular grain dryer 10 to convey the lifted grain to the upper center of the circular grain dryer 10.

At the center of the upper part of the circulation type grain dryer 10, a leveler 8!26 is arranged, which receives the grains conveyed by the screw conveyor 24 and drops them by centrifugal force, making the upper surface shape of the grains 16 into a mortar shape. ing.

These packet conveyor 22, screw conveyor 24
, the equalizer 26 are interlocked, and the motor 27
Driven by.

An example of the body 28 on which the drying section 14 is installed is provided with a hot air generator R30, and an axial blower 32 driven by a motor 31 is provided on the other side.

This hot air generator [30 is composed of, for example, a kerosene burner, and includes a kerosene supply pump 33 and a motor 35 that drives a combustion air supply fan.

As shown in FIG. 2, the drying section 14 is composed of a mesh wall surface 34 and a mesh wall surface 36 that face each other. Drying section 1
4. An air guide path 38 is formed between the drying section 14,
An exhaust passage 40 is formed between the fuselage bodies 28. The drying section 14 and the axial exhaust fan 32 side of the air guide path 38 are partitioned by an inner wall 42, and the hot air from the hot air generator 30 is transferred to the air guide path 3.
8. The grains in the drying section 14 are dried through the drying section 14 and the air exhaust passage 40, and then sent to the axial flow exhaust fan 32 side.

As shown in FIG. 1, the packet conveyor 22 is used as a detector to detect drying conditions that affect the grain drying time.
A moisture detector 44 is disposed at the lower side of the fuselage 28, a level meter 46 is disposed inside the upper part of the fuselage 28, a hot air temperature detector 48 is disposed within the air guide path 38, and an outside temperature detector is disposed outside the fuselage 28. A container 50 is provided.

This moisture detector 44 periodically samples the grains dried in the drying section 14 and conveyed into the packet conveyor 22 to detect the moisture content. Further, the level meter 46 is, for example, a capacitance type, and is adapted to detect the level of grain in the storage section 12.

The signals from these detectors are sent to an analog multiplexer 5
2. Microcomputer 5 via A/D converter 54
6.

The drying condition setting devices include a variety setting device 58 for setting the grain type K, a finishing moisture setting device 60 for setting the finishing moisture G of the grain, and a finishing time setting device 62 for setting the finishing time for drying, which will be described later. A drying mode setting device 64 for setting a drying mode M is provided, and respective set values are supplied to the microcomputer 56. Further, the microcomputer 56 can read the current time from the timer 66.

The microcomputer 56 drives the motor 17, 19, 27, 31, 35, pump 33, and moisture detector 44 via the driver 68 according to these set or detected drying conditions, and achieves the set finish. Finished moisture content G set at time t.

Drying control is performed so that The microcomputer 56 also controls the finishing time and the finishing time 1.
．． Setting errors and the like are displayed on the display 70, and a buzzer 72 is activated in the event of a setting error.

Next, the software configuration of the microcomputer 56 will be explained with reference to FIGS. 3 and 4.

In step 100, data as drying conditions are read from each of the detectors (including the timer 66) and each setting device. Next, in step 102, grain variety K is selected.

The required drying time f (K, m,.

Gr, Gt> is calculated, and the time t0 read from the timer 66 in step 100 is added to this to determine the finishing time t in the normal drying mode.

Here, the maximum drying loss rate mc is the maximum drying loss rate that does not impair the quality of the grain, and is determined as a function of the grain variety K and the moisture content G. The required drying time r becomes longer as the difference between the finished moisture content Gf and the initial moisture content OL increases and as the value of the maximum drying loss mc decreases.

Next, in step 104, the drying mode M set by the drying mode setting unit 64 is determined.

If the normal drying mode is selected, the finishing time t is displayed in step 106. Next, in step 108.110, normal drying control is performed until the moisture content G −/r<G≦Gf. In this normal drying control, the initial moisture content at, the finishing moisture content Gf, the finishing time are set for the grain variety, Grain level L
From the value, a target moisture content curve as shown in FIG. 4 is determined. Then, the hot air generator 3 is set so that the moisture content periodically detected by the moisture detector 44 is on this curve.
0. The axial exhaust fan 32 is operated so that the hot air temperature Th detected by the hot air temperature detector 48 becomes a predetermined temperature. This predetermined temperature is determined in consideration of the outside air temperature Te detected by the outside air temperature detector 50, and when the moisture content periodically detected by the moisture detector 44 deviates from the moisture content curve shown in FIG. is corrected according to the amount of deviation.

In this way, in the normal drying mode, step 102
At time t, calculated as t, the moisture content becomes G, and the circulating grain drying I! ! 10 operations are stopped.

Next, if it is determined in step 104 that the mode is other than the normal drying mode, then in step 112 the values of the finishing times are compared.

1, <1. If it is determined that
At step 4, the buzzer 72 is sounded and an error in setting the finishing time 1 is displayed on the display 70.Next, at step 115, the operator waits for the operator to reset the finishing time t, and then the process returns to step 100. If it is determined in step 112 that t≧L, drying mode M is determined in step 116.

If it is determined that it is the start time delay mode, wait for time t to become (tt t*+to) in step 118, and then proceed normally as described above until G≦Gt in step 108.110. Drying control is performed, where Lo is the drying start time. As a result, the moisture content G changes as shown in FIG. 4, and at the finishing time t set by the finishing time setting device 62, the moisture content G becomes the finished moisture content Gt, and the operation of the circulating type drying tM a 10 starts. will be stopped.

If it is determined in step 116 that the mode is the pause drying mode, steps 120 and 122 determine that the moisture content G is 1, for example.
The same normal drying control as above is performed until the drying temperature reaches 8%. When the moisture content G reaches 18%, the drying operation is temporarily stopped, and in step 124, the time t2 at which drying is to be restarted is calculated.

This time t2 is calculated as follows, that is,
In FIG. 4, a straight line l is drawn passing through a point P where the moisture content G is 18%. The slope of this straight line l is the outside temperature sensor 5o.
It is determined by taking into consideration the value of the outside air temperature Te read from J-.

The intersection of this straight line l and the moisture content curve in the start time delayed drying mode is determined as t2.

Next, in step 126, the process waits until time t reaches t2, and then proceeds to steps 108 and 110, where normal drying control similar to the above is performed. As a result, the moisture content curve is the same as that in the normal drying mode until time t1 after the start of drying, and time 1. From time t2 to time t2, it becomes direct ki f, and time t! Finishing time 1
．． It becomes equal to the moisture content curve in the delayed start time drying mode. In this way, by stopping the drying operation from time t1 to time t2, the difference in moisture content between the inside of the grain and its surface portion becomes smaller, and it is possible to prevent the formation of shell side due to drying after restarting the drying operation. can.

If it is determined in step 116 that the mode is low air volume drying mode, low air volume drying control is performed in steps 128 and 130 until G≦G. That is, as shown in the fourth area, at time 1. Find a target moisture content curve such that the moisture content G becomes the finished moisture content G. Then, the air volume by the axial exhaust fan 32 is adjusted so that the moisture content follows this moisture content curve.

In this case, the air volume by the axial exhaust fan 32 is smaller than the air volume in the normal drying mode. Note that the rotational speed of the axial exhaust fan 32 is set to be the same as the rotational speed in the normal drying mode.

As a result, the moisture content of the grain is gradually lowered than in the normal drying mode, so that it is possible to prevent the grain from forming a shell side.

If it is determined in step 116 that the mode is low hot air drying mode, low hot air drying control is performed in steps 132 and 134 until GAG is reached. That is, as shown in FIG. 4, at time 1. A target moisture content curve such that the moisture content G becomes the finished moisture content Gf is determined. Then, the temperature of the hot air is adjusted so that the moisture content follows this moisture content curve. In this case, the hot air temperature will be lower than the hot air temperature in the normal drying mode. Note that the rotational speed of the axial exhaust fan 32 is set to be the same as the rotational speed in the normal drying mode.

As a result, as in the case of the low air flow drying mode, the moisture content of the grain gradually decreases compared to the case of the normal drying mode, so that it is possible to prevent the grain from forming a shell side.

The selection between the low air volume drying mode and the low hot air drying mode is made depending on the grain variety, outside air humidity, etc.

In the above embodiment, the drying start time t0 is read, but if the time of the timer 66 is cleared at the start of drying, there is no need to read the time t0. In this case, finishing time 1. The origin is the point at which drying starts.

In addition, in the present invention, it is only necessary to perform grain drying control so that the finished moisture content G is set at the set finishing time tf. It is sufficient if at least one of a drying mode and a low-hot air drying mode is included.

〔Effect of the invention〕

In the grain dryer control device according to the present invention, grain drying is controlled so that the finishing moisture level is set at the set finishing time according to the drying conditions set by the operator or detected by the detector. As a result, the drying operation can be stopped at the preset finishing time, which has the excellent effect of allowing subsequent work to proceed as scheduled.

[Brief explanation of drawings]

Figure 1 is a diagram showing the hardware configuration of the example, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a flowchart showing the software configuration of the example, and Figure 4 is a diagram showing each drying process. FIG. 3 is a diagram showing a target moisture content curve in the mode. 10...Circulating grain dryer 30...Hot air generator 32...Axial flow exhaust fan 44...Moisture detector 46...Level meter 48...Hot air temperature detector 50...Outside Air temperature detector 58... Variety setting device 60... Finishing moisture setting device 62... Finishing time setting device 64... Drying mode setting device

Claims (1)

[Scope of Claim] A grain dryer control device that sets or detects grain drying conditions, and blows hot air onto the grains based on the drying conditions to dry the grains, comprising: a finishing time and a finishing moisture content as the drying conditions; 1. A grain dryer control device comprising: a means for setting grain drying conditions; and a means for controlling grain drying so that a set finishing moisture is achieved at a set finishing time in accordance with drying conditions.