JP2580040B2 - Control equipment for grain drying equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device of a grain drying apparatus for drying while circulating and flowing the grain.

[Conventional technology]

2. Description of the Related Art Conventionally, a control device of a grain drying device that controls a circulation unit, a blowing unit, a burner, and the like of the grain drying device so as to dry the grain to a predetermined moisture value is known.

In this control device, a moisture sensor for detecting the moisture value of the grain is provided in the grain drying device, and the moisture sensor detects the moisture value of the grain during drying. The detected moisture value and the set moisture value set by a dial etc. (for example, 15%)
Is compared with a control device constituted by a microcomputer or the like. As a result, when the detected moisture value becomes equal to the set moisture value, the circulating system, the blowing system and the burner of the drying device are stopped.

By the way, in the grain drying apparatus, when an abnormality occurs in the circulation system, the blowing system, the burner, and the like, the operation of all the systems such as the fire extinguishing of the burner is stopped regardless of the abnormality in any of the systems.

However, when an abnormality of the circulation system occurs while the grain drying device is circulating and blowing, the air blowing system is stopped, and the drying state of the grain being dried becomes uneven, which is not preferable. Also, if there is an abnormality in the burner during drying, if all the systems are stopped when the water content is equal to or higher than a predetermined moisture value (for example, 20%), the grain will be left in an undried state, There is a problem that it is steamed and deteriorates.

For this reason, when the burner is abnormal and the burner is extinguished, the moisture in the grain during drying is measured, and all the systems are stopped only when the measured moisture value is below the reference value. An apparatus has been proposed (JP-A-61-2524).
No. 80). According to this, it is possible to take a countermeasure according to the dry state of the grain.

[Problems to be solved by the invention]

However, in order to measure the moisture value after the abnormality is detected, the circulatory system must be operated to sample the grain even after the abnormality is detected, and the grain must be transported to the moisture measuring device. In addition, the time required to measure the moisture value of the sampled grain is also required, and when an abnormality occurs, the circulation system and the ventilation system must be stopped immediately even when the moisture value is equal to or less than a predetermined value. There is a problem in that the grains must be activated by this operation, and the quality of the grains is thereby increased.

The present invention has been made in view of the above-described circumstances, and has as its object to provide a control device for a grain drying apparatus capable of performing appropriate abnormality processing according to the content of the abnormality at the time of occurrence of the abnormality and the drying state of the grain.

[Means for solving the problem]

A control device for a grain drying device according to the present invention controls a grain drying device including a circulation system for circulating and flowing grains, a blowing system for blowing outside air to the grains to be circulated and flowing, and a burner for heating the blown outside air. A control device for the grain drying device, wherein the moisture detection sensor detects a moisture value of the grain at predetermined time intervals during a grain drying process, a storage unit for storing the detected moisture value, and a burner extinguishing operation. First abnormality processing means for performing abnormality processing based on the contents of the abnormality and the current operation when an abnormality occurs in the circulation system or the air supply system, and an abnormality occurs in the burner during the operation at the time of burner ignition. A second abnormality processing unit that stops the operation of the transport system and the circulation system when the latest moisture value stored in the storage unit is equal to or less than a predetermined reference moisture value when the burner is extinguished. ing.

[Action]

According to the present invention, during work when the burner is extinguished, appropriate abnormality processing is performed based on the contents of the abnormality and the contents of the work, for example, when a circulation abnormality occurs during circulation ventilation, the ventilation system is continuously operated, If the air is being discharged and blown, the operation of all systems is stopped. Thereby, the grain can be prevented from being uneven and the grain can be prevented from being deteriorated.

If an abnormality occurs during the operation of igniting the burner, the burner is extinguished and the moisture value stored in the storage means is compared with a predetermined reference moisture value. In this comparison result, when the moisture value is equal to or less than the reference moisture value, if the operation of the ventilation system and the circulation system that are operating normally is continued, the operation becomes the same as a so-called steaming operation, and the grains are over-dried, and the body cracks and the like occur. In some cases, the operation of the ventilation system and the circulation system is also stopped. In addition, when the moisture value exceeds the reference moisture value, the steaming operation is performed gradually, so that the air blowing system and the circulation system are continuously operated. This makes it possible to perform the optimum abnormality processing according to the finished state of the grain.

In the present invention, the moisture value to be compared with the reference moisture value, the moisture value that is periodically detected is stored in the storage means,
When an abnormality occurs, one of the moisture values stored in this storage means
By reading and using the latest moisture value, it is not necessary to detect the moisture value again after the occurrence of the abnormality, and the abnormality processing time can be reduced.

〔Example〕

FIGS. 1 and 2 show a grain drying apparatus 10 provided with a grain drying apparatus control device according to an embodiment of the present invention. It is in the shape. The upper internal cavity of the fuselage 12 is a grain tank 14, and the lower internal cavity is a drying unit 16.

The drying section 16 is formed with a flow-down passage 18 partitioned by a porous net-like partition so that grains in the grain tank 14 flow down. Between the downstream flow paths 18, air guide paths 20 and exhaust air paths 22 are formed alternately. A burner 24 is connected to the air guide path 20, and a suction blower 27 which is a blowing system is connected to the exhaust path 22. Because of this, burners
The hot air generated by 24 is sent to wind guideway 20,
It flows from 20 through the downflow path 18 to the exhaust air path 22. Therefore, the grains in the downflow path 18 are dried by the hot air.

A shutter drum 30, which forms part of a circulation system reciprocatingly rotated by a motor 28, is disposed at the lower end opening of the downflow passage 18, and the cereal that passes through the downflow passage 18 and is dried is a grain collecting unit below the shutter drum 30. It is fed out to 31. At the side of the grain collecting section 31, an insertion port 29 for inserting grain into the machine is provided.

A lower screw conveyor 34, which is a circulating system driven by a synchronous motor 32, is disposed below the grain collecting unit 31, and the grain fed by the shutter drum 30 is machined.
It is designed to be transported to the front side of 12. On the front side of the body 12, a bucket conveyor 36, which is a circulation system, stands.

The inside of the bucket conveyor 36 includes an endless conveyor 39 driven by a synchronous motor 38 and a grain transport bucket 41 attached to the endless conveyor 39. These also constitute a circulation system together with the shutter drum 30 and the like. This bucket conveyor 36 is a lower screw conveyor 34
Is transported to the top of the body 12.
The upper screw conveyor is located at the upper end of the bucket conveyor 36.
One end of 40 corresponds, and the upper screw conveyor 40
The other end is connected to a rotary equalizer 42 as a circulation system.

In addition, the screw conveyor 40 and the rotary equalizer 42 are
Driven by a motor 38 together with a bucket conveyor 36,
The grains lifted and conveyed by the bucket conveyor 36 are distributed and distributed to the grain tank 14 of the body 12.

At the lower part of the bucket conveyor 36, a moisture sensor 44 for detecting the moisture value of the grain is arranged, and a part of the grain scooped up when the bucket 41 for transporting the grain of the bucket conveyor 36 is turned over. It is designed to flow into.

As shown in FIG. 3, a power switch 50, a drying operation switch 52, and a moisture setting dial 5 provided on the operation unit 60 are provided.
3. The grain setting dial 54 and the humidity setting dial 56 are each connected to a control circuit 48 arranged inside the body 12. The control circuit 48 includes the burner described above.
24, a suction blower 27, a motor 28, a motor 32, a motor 38, a moisture sensor 44 are connected, and an AC power supply 51 is connected via a power switch 50, and a predetermined voltage (100V or 200V) is supplied from the AC power supply 51. And a predetermined frequency (50Hz or 60Hz)
Is provided.

In the memory of the control circuit 48, the moisture value detected by the moisture sensor 44 is sequentially updated and stored. In the present embodiment, since the detection of the moisture value is performed every 30 minutes, the moisture value in the memory is updated to a new moisture value every 30 minutes.

Here, a flame detector 62, a high-temperature thermosensor 64, and an airflow switch 66 are attached to the burner 24, and are connected to an abnormality detection device 68, respectively. The state of the burner 24 is detected by each of these sensors, and abnormality can be determined. In the circulating system, thermal relays 70, 72, and 74 are attached to the motors 28, 32, and 38, respectively, and are connected to the abnormality detection device 68. With these thermal relays 70, 72, 74, the load state of the motors 28, 32, 38 can be detected and abnormality can be determined. Further, a thermal relay 76 is also attached to the air blowing system, and is connected to the abnormality detecting device 68. The thermal relay 76 can detect a load state and determine an abnormality.

The abnormality detection device 68 is connected to the control circuit 48, and outputs a signal for activating an abnormality processing routine programmed in the control circuit 48 when an abnormality occurs.
Further, the abnormality detecting device 68 is connected to a notifying device 78 including a display unit, a buzzer, and the like for notifying the operator of the abnormality when an abnormality occurs. Further, a restoration completion operation switch 80 operated when the restoration is completed after the occurrence of the abnormality is also connected, and the operation of the restoration completion operation switch 80 causes the control by the control circuit 48 to return from the abnormality processing routine to the normal drying control routine. Can be.

 Next, the operation of the present embodiment will be described.

First, a grain moisture detection control routine by the micro computer will be described in detail with reference to FIG.

When the power switch 50 is turned on, a timer for reading the output of the moisture sensor 44 every predetermined time T (for example, one second) is started (step 200). Next, it is determined whether or not the time of the timer 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), the timer is reset (step 208), and the process jumps 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. In the micro computer, the average value of the plurality of moisture values is calculated and stored in the memory as the moisture value every 30 minutes.

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

Grains (eg, paddy) are loaded into the grain drying device 10,
When the drying operation switch 52 is turned on, the grain setting dial
Determine which grain is set to 54 (step
100).

If it is determined that the grain setting dial 54 is set to, for example, paddy, the set moisture value set by the moisture setting dial 53, for example, 15% is read (step 10).
Four).

Next, a fire extinguishing moisture value for extinguishing the burner 24 is determined from the set moisture value of 15%. That is, the fire extinguishing moisture value is set to a predetermined amount, for example, 17%, which is larger by 2% than the set moisture value 15% (step 106).

Thereafter, the burner 24 is ignited, and the suction / exhaust air blower 27 is turned on (step 108), and the motors 28, 32, and 38 are turned on, and the shutter drum 30 and the transport section (the lower screw conveyor 34, the bucket conveyor 36, and the upper screen) are turned on. Yukon conveyor 40,
The rotary equalizer 42) is rotated (step 110).

As a result, the hot air is sucked into the draft blower 27 and
The hot air sent into the air duct 20
It is supplied directly to the paddy inside. Further, the hot air after absorbing the moisture of the paddy is discharged to the outside of the grain drying device 10 through the exhaust air passage 22.

Further, the paddy is fed from the drying unit 16 to the grain collecting unit 31 by the shutter drum 30, and is successively conveyed from the grain collecting unit 31 to the bucket conveyor 36 by the lower screw conveyor 34, and further rotated by the bucket 41 of the bucket conveyor 36. Is transported upward. Airframe 12 by bucket conveyor 36
Is transported to the upper central portion of the machine body 12 by the upper screw conveyor 40, and returned to the grain tank 14 in the machine body by the rotary equalizer 42.

While performing this hot air drying, a predetermined time (for example, 30 minutes)
Each time, the detected moisture value is compared with the above fire extinguishing moisture value, and it is determined whether or not the detected moisture value is 17% or less of the fire extinguishing moisture value (step 112).

If the moisture value of the grain (detected moisture value) is 17% or less, the burner 24 is extinguished (step 114). As a result, the outside air is sucked by the draft blower 27 and sent into the air guide path 20, and the outside air sent into the air guide path 20 is directly supplied to the paddy in the downflow path 18, and the circulating blast drying is performed.

In the next step 116, the detected moisture value is set to the set moisture value of 15%.
It is determined whether or not the following has been reached (step 116).

When the detected moisture value of the paddy becomes less than the set moisture value of 15%, the suction air blower 27 is turned off, and the motors 28, 32, 38
Is turned off, the shutter drum 30 and the transport section (the lower screw conveyor 34, the bucket conveyor 36, the upper screw conveyor 40, and the rotary equalizer 42) are stopped to end the drying operation (step 118).

Here, the grain drying device 10 of the present embodiment is provided with an abnormality detection device 68 that detects an abnormality of each system, and when an abnormality is detected by the abnormality detection device 68 during the drying operation,
By the interruption, the process proceeds to the abnormality processing routine shown in FIG. Hereinafter, the abnormality processing routine will be described.

First, in step 200, the system in which an abnormality is detected is determined. If the system where the abnormality is detected is a circulatory system,
The process proceeds to 2, and first, the operation of the circulation system is stopped. In the next step 204, the current work content is determined. That is, the subsequent abnormality processing differs depending on the work content. In step 204, the current work is circulated ventilation work (burner 2
4 is extinguishing the fire), stop the operation of the ventilation system,
Since there is a possibility that the grain may be steamed, the process proceeds to step 206 while the operation of the air blowing system is continued, and the abnormality is notified.

If the current work is the discharge ventilation work (the burner 24 is extinguishing the fire) in step 204, the grain drying apparatus 10 can be completely stopped. After stopping the operation of the system,
Move to step 6 to notify the abnormality.

If the burner 24 is currently ignited in step 204, it is necessary to extinguish the burner 24 irrespective of other work contents, so the process proceeds to step 210 to extinguish the burner 24. The processing after step 210 will be described later.

Next, when it is determined that the system in which the abnormality is detected in step 200 is the air blowing system, the process proceeds to step 212, and first, the operation of the air blowing system is stopped. In the next step 214, the current work content is determined in the same manner as when the circulatory system is abnormal. Here, in the case of a blower system abnormality, the abnormality processing differs depending on whether the burner 24 is igniting or extinguishing. If the burner 24 is extinguished in step 214, the process proceeds to step 206 while the other normal systems are continuously operated, and the abnormality is notified. If the burner 24 is being ignited in step 214, the process proceeds to step 210 to extinguish the burner 24 first. Where
If an abnormality occurs in the burner 24 in 200, the process proceeds to step 210, and the burner 24 is extinguished. After the burner 24 has been extinguished, the process proceeds from step 210 to step 216 to read out the moisture value stored in the memory of the control circuit 48 of the grain drying apparatus 10, and then at step 218, the moisture content thus read out is read. Determine if the value is less than 20%. Here, when a negative determination is made, that is, when it is determined that the moisture value exceeds 20%, it is determined that the grain does not deteriorate even if the so-called steaming process is continued, and another system (blowing system) And the operation of the circulatory system) is continued, and the process proceeds to step 206 to notify the abnormality.

In addition, an affirmative determination is made in step 218, that is,
%, It is judged that there is a risk of body cracking or deterioration when the steaming process is performed, and it is determined that there is a risk of body cracking and deterioration.
The process proceeds to step 206 to perform abnormality notification.

The abnormality is notified by activating the notification device 78 in step 206, and after the operator has taken a countermeasure in response to this abnormality, the operator can operate the restoration completion operation switch 80 to complete the restoration of the abnormality in the control device. It is determined that it has been performed (step 222), and the process returns.

As described above, in the present embodiment, the abnormal processing can be performed without causing the deterioration of the grain by changing the abnormal processing according to the abnormal system (abnormal contents) and the work contents at that time. it can. Further, when the burner 24 is extinguished, the abnormal processing is changed depending on whether or not the moisture value measured last time is equal to or less than the predetermined value (20%). The finished state can be maintained.

Further, in this embodiment, since the above-mentioned moisture value is compared with a predetermined value using the moisture value measured last time (up to 30 minutes before), it is not necessary to measure the moisture value again after the occurrence of the abnormality, Can be shortened.

〔The invention's effect〕

As described above, the control device of the grain drying apparatus according to the present invention has an excellent effect that appropriate abnormality processing can be performed according to the content of the abnormality when the abnormality occurs and the drying state of the grain.

[Brief description of the drawings]

1 is a schematic sectional view of the grain drying apparatus of the present embodiment, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a circuit diagram of a control apparatus of the grain drying apparatus of the present embodiment. FIG. 4 is a flow chart showing a control routine for reading the output of the moisture sensor of the present embodiment. FIG. 5 is a flow chart showing a control routine of the drying control of the present embodiment. 9 is a flowchart showing a processing interrupt routine. 10 ... Grain dryer, 24 ... Burner, 27 ... Suction blower, 28 ... Motor, 32 ... Motor, 38 ... Motor, 44 ... Moisture sensor, 48 ... Control circuit, 53 ... Moisture Setting dial, 68 …… Abnormality detection device.

Claims (1)

(57) [Claims] 1. A control apparatus for a grain drying apparatus for controlling a grain drying apparatus having a circulation system for circulating and flowing grains, a blowing system for blowing outside air to the grains to be circulated and flowing, and a burner for heating the blown outside air. There is a moisture detection sensor that detects the moisture value of the grain every predetermined time during the drying process of the grain, a storage unit that stores the detected moisture value, and a circulation system or a ventilation system during work when the burner is extinguished. A first abnormality processing means for performing an abnormality process based on the content of the abnormality and the current work content when an abnormality has occurred, and when the burner has an abnormality and the fire is extinguished during the operation at the time of burner ignition, A control device for a grain drying apparatus, comprising: second abnormality processing means for stopping the operation of the transport system and the circulation system when the latest moisture value stored in the storage means is equal to or less than a predetermined reference moisture value.