JPH02233987A - Controller of grain dryer - Google Patents

Abstract

PURPOSE:To reduce errors between the moisture content of grain after dried and a set moisture content by a method wherein when the moisture content of the grain detected by a moisture sensor is a specified value larger than a set moisture content, the grain is dried by ventilation and grain circulation after a burner is stopped, and a ventilation equipment and a grain circulation equipment are stopped when the moisture content of the grain becomes equal to the set moisture content. CONSTITUTION:Grain loaded in a dryer 10 is dried while it is fluidized and circulated by circulation equipment 34, 36, 40 and 40, ventilator 27, and a burner 24. During drying, the moisture content of the grain is detected by a moisture sensor 44. When the detected moisture content becomes a specified value larger than a set moisture content, the burner 24 is stopped by a controller 48. At this time, the ventilator and the circulation equipment are kept in operation to dry the grain by ventilation and grain circulation. After that, when the moisture content of the grain becomes equal to the set moisture content, the ventilator and the circulation equipment are stopped to stop grain circulation and fluidization. Therefore, when drying operation is completed, the grain is cooled down and the moisture content of the grain reaches the set moisture content.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a grain drying device, and more particularly to a control device for a grain drying device that dries grain while circulating and flowing it.

[Prior Art] Conventionally, a control device for a grain drying device is known that controls a circulation means, an air blowing means, a burner, etc. of the grain drying device so as to dry the grain to a predetermined moisture value.

This control device dries grains using the operating pattern shown in FIG. That is, a moisture sensor is provided in the grain drying apparatus to detect the moisture value of the grain, and this moisture sensor detects the moisture value of the grain during drying. This detected moisture value is compared with a set moisture value (for example, 15%) set by a dial or the like by a control device including a microcomputer or the like. As a result, when the detected moisture value becomes equal to the set moisture value, the circulation means, blower means, and burner of the drying device are stopped.

However, in the control device for this grain drying device, the burner is stopped when the set moisture value is reached, so the temperature of the grain is high (for example, 40° C.) immediately after the grain drying device is stopped. For this reason, it is necessary to let the grain cool naturally before performing the next operation (for example, hulling), and this natural cooling takes time, resulting in poor work efficiency. In addition, since the drying equipment is stopped when the grain temperature is high,
It is necessary to correct the detected moisture value to the moisture value at normal temperature (for example, 25° C.), compare this corrected moisture value with a set moisture value, and then stop the drying device. Therefore, an error is likely to occur between the moisture value when the grain reaches room temperature and the set moisture value.

Is there a system for grain drying equipment that solves the above problems and quickly cools grains? As the B device, a control device that dries grain according to the operation pattern shown in FIG. 8 is known. That is, when the detected moisture value reaches a set moisture value (for example, 15%), the burner is extinguished and the grain is cooled by circulating air. Thereafter, when the temperature of the grain reaches normal temperature (for example, 25° C.), the circulation means and the blowing means are stopped.

However, in the control device of this grain drying device, after the grain has reached the set moisture value, it is further cooled by circulating air. For this reason, the drying of the grain progresses further and becomes over-dried (for example, 13%).

[5 Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems.It eliminates the need to let the grain cool naturally after the drying process is completed, and reduces the moisture content of the grain after the drying process is completed. It is an object of the present invention to provide a control device for a grain drying device that can extremely reduce the error between the moisture value and the set moisture value.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a circulating means for circulating grain, a blowing means for blowing outside air onto the circulating grain, and a burner for heating the blown outside air. A control device for a grain drying device that controls a grain drying device comprising: a moisture sensor that detects a moisture value of the grain; and operating the circulation means, the blowing means, and the burner to dry the grain; When the moisture value of the grain is larger than the set moisture value by a predetermined amount, the burner is stopped and the grain is ventilated and circulated to dry, and when the moisture value of the grain becomes equal to the set moisture value, the blowing means and the circulation means are turned off. The apparatus is characterized by comprising a control means for stopping the apparatus.

[Operation] According to the present invention, the grain loaded in the apparatus is dried while being circulated and flowed within the apparatus by the circulation means, the blower means, and the burner. In this case, the moisture value of the grain is detected by the moisture sensor. When the detected moisture value becomes larger than the set moisture value by a predetermined amount, the control means stops the burner. At this time, the operation of the air blowing means and circulation means is continued to circulate and dry the grains. Thereafter, when the moisture value of the grain becomes equal to the set moisture value, the circulation means and circulation flow are stopped. Therefore, at the end of the drying operation, the grain has been cooled and the moisture value of the grain has reached the set moisture value.

[Effects of the Invention] Since the present invention has the above-mentioned structure, it is not necessary to let the grain cool naturally after the completion of the drying operation, and the moisture value at the end of drying can be set to the set moisture value, which is an excellent effect. are doing.

[Embodiment] Fig. 1 and Fig. 2 show a grain drying apparatus 10 equipped with a control device for a grain drying apparatus according to an embodiment of the present invention. It is said to be box-shaped, long from front to back. The upper inner cavity of the fuselage 12 serves as a grain tank 14, and the lower inner cavity serves as a drying section 16.

A flow path 18 partitioned by a porous mesh-like partition wall is formed in the drying section 16, and the grains in the grain +f 14 flow down. Air guide passages 20 and air exhaust passages 22 are alternately formed between adjacent flow passages 18.

A burner 24 is connected to the air guide path 20, and a suction exhaust fan 27 is further connected to the air exhaust path 22. Therefore, the hot air generated by the burner 24 is sent to the air guide path 20, passes through the downstream path l8 from the air guide path 20, and enters the air exhaust path 22.
flows to Therefore, this hot air dries the grains in the flow path l8.

A shutter drum 30 that is reciprocated by a motor 28 is arranged at the lower end opening of the flow path l8.
The dried grains that have passed through 8 are delivered to a grain harvesting section 31 below the shirt drum 30.

There is a loading port 29 on the side of the grain harvesting section 31 for loading grain into the machine.
is provided.

Further, a lower screw conveyor 34 driven by a synchronous motor 32 is arranged at the lower part of the grain harvesting section 31, and is adapted to convey the grain fed out by the shirt drum 30 to the front side of the machine body 12. A packet conveyor 36 is erected on the front side of the body 12.

The inside of this packet conveyor 36 is comprised of an endless conveyor 39 driven by a synchronous motor 38 and grain conveying packets 41 attached to the endless conveyor 39. This packet conveyor 36 is a lower screw conveyor 3.
The grain sent out from 4 is conveyed to the top of the machine body 12. One end of an upper screw conveyor 40 corresponds to the upper end of the packet conveyor 36, and a rotary equalizer 42 is connected to the other end of the upper screw conveyor 40.

The upper screw conveyor 40 and the rotary equalizer 42 are driven by a motor 38 together with the packet conveyor 36, and distribute the grain lifted and conveyed by the packet conveyor 36 to the grain tank 14 of the machine body 12.

A moisture sensor 44 for detecting the moisture value of grain is arranged at the bottom of the packet conveyor 36, and when the grain conveying packet 41 of the packet conveyor 36 is reversed, a portion of the scooped grain flows into the inside. It is supposed to be done.

As shown in FIG. 3, a power switch 50, a drying operation switch 52, a moisture setting dial 53, a grain setting dial 54, and a humidity setting dial 56 are provided in the reproduction section 60.
are each connected to a control circuit 48 located inside the fuselage 12. The control circuit 48 is connected to the burner 24 , suction fan 27 , motor 28 , motor 32 , motor 38 , and moisture sensor 44 described above, and is also connected to an AC power source 51 via a power switch 50 . A predetermined voltage (100V or 20V) is supplied from the AC power supply 51.
0V) and a predetermined frequency (507 or 607) is supplied.

Next, the operation of this embodiment will be explained. First, let's talk about the grain moisture detection control routine using a microcomputer.
This will be explained in detail with reference to the drawings.

When the power switch 50 is turned on, a timer is started to read the output of the moisture sensor 44 every predetermined time T (for example, 1 second) (step 200).

Next, it is determined whether the timer time is equal to a predetermined time T (step 202).

If it is determined that the timer time is equal to the predetermined time T, the output of the moisture sensor is read (step 204).
, reset the timer (step 208) and jump to step 200.

That is, the output of the moisture sensor 44 is read every predetermined time T, and the moisture value of the grain is detected and recorded in the microcomputer.

Next, the drying control routine by the microcomputer will be described in detail with reference to FIG. 5 using numerical values that do not interfere with the present invention.

Grain (for example, paddy) is loaded into the grain drying device 10,
When the drying operation switch 52 is turned on, it is determined which grain the grain setting dial 54 is set to (step 100).

If it is determined that the grain setting dial 54 is set to paddy, for example, the set moisture value set by the moisture setting dial 53, for example 15%, is read (step 1).
04).

Next, the extinguishing moisture value for extinguishing the burner 24 is determined from this set moisture value of 15%. That is, the extinguishing moisture value is set to be a predetermined amount, for example, 2% larger than the set moisture value of 15%.
% (step 106).

Thereafter, the burner 24 is ignited, the suction exhaust fan 27 is turned on (step 108), and the motors 28, 32, 3
8 is turned on to rotate the shirt drum 30 and the conveying section (lower screw conveyor 34, packet conveyor 36, upper screw conveyor 40, rotary equalizer 42) (step 110).

As a result, the hot air is sucked into the air blower 27 and the air guide path 2
The hot air sent into the air guide path 20 is directly supplied to the rice grains in the downstream path 18.

Further, the hot air after absorbing the moisture of the paddy is discharged to the outside of the grain drying apparatus 1.0 through the air exhaust path 22.

Further, the paddy is fed from the drying section 16 to the grain harvesting section 31 by the shutter drum 30, and is sequentially conveyed from the grain harvesting section 31 to the packet conveyor 36 side by the lower screw conveyor 34, and then upward by the packets 41 of the rotating packet conveyor 36. transported to. Packet conveyor 3
The paddy conveyed to the upper part of the machine body 12 by the upper screw conveyor 40 is sent to the upper central part of the machine body 12 by the upper screw conveyor 40, and is returned to the grain bin 14 in the machine body by the rotary equalizer 42.

While performing this hot air drying, the moisture of the paddy is detected by the moisture sensor 4 at predetermined time intervals T according to the control routine shown in FIG.
4 and read into the control circuit 48. It is determined whether the detected moisture value is less than or equal to the fire extinguishing moisture value calculated in step 106 (step 112).

If the moisture value of the grain (detected moisture value) is less than the extinguishing moisture value of 17%, the burner 24 is extinguished (step 114).

As a result, the outside air is sucked into the air blower 27 and the air guide path 2
The outside air sent into the air guide path 20 is directly supplied to the rice grains in the flow path 18, and circulation air drying is performed.

In the next step 116, it is determined whether or not the read detected moisture value has become equal to or less than the set moisture value of 15% (step 116).

When the detected moisture value of the paddy falls below the set moisture value of 17%, the suction and exhaust fan 27 is turned off, and the motors 28 and 3 are turned off.
2 and 38 are turned off, and the shirt drum 30 and the conveyance section (
The lower screw conveyor 34, packet conveyor 36, upper screw conveyor 40, and rotary equalizer 42) are stopped to complete the drying operation (step 118).

Further, when the grain to be dried is other than paddy, the extinguishing moisture value is determined from the set moisture value determined according to the seed order of the grain (step 120).

The outline of the drying operation pattern is shown in Figure 6. Until the burner is extinguished, drying is performed at an average drying rate of 1%/h, and after the burner is extinguished, the average drying rate is 0.5%/h.
dried.

In this way, in the above embodiment, the extinguishing moisture value of 17% for extinguishing the burner is determined from the set moisture value of 15% set by the moisture setting dial, and the extinguishing moisture value of 17% is determined for extinguishing the burner.
% and the detected moisture value detected by the moisture sensor 44, the burner 24 is extinguished and circulation drying is performed. Thereafter, when the detected moisture value becomes equal to the set moisture value of 15%, the drying device is stopped.

Therefore, the temperature of the paddy at the end of the drying operation is approximately room temperature 25°C. Therefore, the next work such as husking can be done immediately. Furthermore, there is no need to temperature-correct the detected moisture value of the paddy at the end of the drying operation, and errors due to correction do not occur. Therefore, the error between the grain moisture value and the set moisture value can be made extremely small.

Furthermore, after the moisture content of the paddy reached the extinguishing moisture value of 17%,
Since the burner 24 is extinguished and the rice is dried using residual heat (35° C.), the burner 24 has good fuel efficiency.

Further, the Tevana 24 is extinguished when the moisture content of the rice reaches the extinguishing moisture value of 17%. For this reason, as in the prior art shown in Figs. 7 and 8, the maximum temperature of paddy (4
The maximum temperature of paddy is lower (35℃) compared to 0℃).
. Therefore, it is possible to prevent the quality of paddy from deteriorating due to high temperatures.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of the grain drying device of this embodiment, Fig. 2 is a sectional view taken along line 1-1 in Fig. 1, and Fig. 3 is a circuit diagram of the control device of the grain drying device of this embodiment. FIG. 4 is a flowchart showing a control routine for reading the output of the moisture sensor of this embodiment, FIG. 5 is a flowchart showing a control routine for drying control of this embodiment, and FIG. 6 is a flowchart showing a control routine for drying control of this embodiment. Diagrams illustrating an outline of control. FIGS. 7 and 8 are diagrams illustrating an outline of conventional drying control. 10... Grain drying device, ・Burner, ・Suction/exhaust fan, ・Motor, ・Moisture sensor, ・Control circuit, ・Moisture setting dial.

Claims (1)

[Claims] (1) A control device for a grain drying device that controls a grain drying device equipped with a circulation means for circulating and flowing grain, a blowing means for blowing outside air onto the circulating and flowing grain, and a burner for heating the blown outside air. The moisture sensor detects the moisture value of the grain, and the circulation means, the blower means, and the burner are operated to dry the grain, and when the moisture value of the grain is larger than the set moisture value by a predetermined amount, the burner is activated. a control means for stopping the air blowing means and the circulation means when the moisture value of the grain becomes equal to a set moisture value. control device.