JP2629087B2 - Supply control device in dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed rate control device for a dryer, and more particularly, to grains supplied from a grain storage section via conveying means for conveying the grains at a variable conveying speed. A grain receiving part for receiving and storing the grains, and a grain stored in the grain receiving part passing downward, and drying by passing hot air through the passing grains. Storage unit for detecting a storage amount of the grain receiving unit in a dryer having a unit and a drive device that can be driven intermittently provided below the unit so as to send out the kernel that has passed through the drying unit. Detecting means for automatically increasing or decreasing the transport speed of the transport device based on the detection information of the stored amount detecting means so as to maintain the stored amount within a set range, and intermittently driving the sending device. Supply amount control device in a dryer having On.

[0002]

2. Description of the Related Art Even if the grains are supplied to the grain receiving portion by driving the transport means at a constant transport speed, and the dryer is operated under the supply, the drying is performed by the dryer. Grain throughput is not always kept constant. This is because the grain to be treated may have its transported characteristics fluctuated due to a change in its moisture value or the like. This is because the amount of grains sent into the dryer via the variator may vary. When such fluctuations occur and the amount of the grain stored in the grain receiving portion is based on the change to be in a state where none or almost none is present, aeration is performed on the grain passing through the drying part located thereunder. The passage of hot air for drying the grain should be formed in a state of passing through the grain receiving portion without passing through the grain of the drying unit (in other words, hot air blow-through occurs), Drying of the grain will not be performed as expected.
Therefore, in order to avoid such a situation, conventionally, when the grain storage amount (hereinafter, simply referred to as the kernel storage amount) in the grain receiving unit becomes smaller than the lower limit set value ( That is, when the kernel storage amount becomes insufficient, the sending device is stopped and the transport speed of the transport unit is increased to thereby supply the kernel to the kernel receiving unit (hereinafter, the kernel supply amount).
(Referred to simply as grain supply).
It should be noted that, when the kernel storage amount becomes larger than the lower limit set value, the delivery device is driven again. Further, when the kernel storage amount becomes larger than the upper limit set value (ie, when the kernel storage amount becomes excessive), the transport speed of the transport unit is reduced to reduce the kernel supply amount. It was adjusted to make it happen. That is, the transport speed of the transport unit is increased / decreased and the drive of the delivery device is intermittently performed based on the detection information of the kernel storage amount, and the kernel storage amount is maintained within the set range by the operation. I was

[0003]

In such a conventional structure, when the storage amount of the grain becomes insufficient, the sending device is stopped until the storage amount is recovered, and during the stop time, the feeding device is stopped from the dryer. There is a disadvantage that the delivery of the dried grains is not performed and the efficiency of the drying operation of the grains is reduced, and it has been desired to reduce the stop time of the delivery device as much as possible. The present invention has been made in view of such circumstances, and an object of the present invention is to make it possible to efficiently control the operation of each unit by preventing the sending device from stopping as much as possible.

[0004]

According to the present invention, there is provided a dryer for controlling a supply amount in a dryer, wherein the storage amount detecting means determines whether or not the storage amount is smaller than a set lower limit value. It is configured to be able to detect whether it is larger or smaller than an intermediate set level set to a larger value, and whether it is larger than a set level for starting operation of the sending device. The supply amount adjusting means stops the sending device as the storage amount becomes smaller than the set lower limit, and as the storage amount becomes larger than a set level for the operation start. To drive the sending device,
And, only when the sending device is in a driving state, while reducing the transport speed of the transport means by a first set amount as the storage amount becomes smaller than the intermediate set level, As the storage amount decreases from large to small with respect to the intermediate set level, the transport speed of the transport unit is increased by a second set amount set to a value larger than the first set amount. There is a point.

[0005]

According to this feature, the kernel storage amount is:
It is detected in at least two stages: a set lower limit and an intermediate set level set to a value larger than the lower limit. Then, while the delivery device is in the driving state, the increase amount when the kernel storage amount becomes large to small with respect to the intermediate setting level is increased from small to large with respect to the intermediate setting level. By making the amount larger than the decrease amount in the case of the above, it becomes possible to suppress the amount of stored kernel particles from becoming smaller than the set lower limit as much as possible. As a result, it is possible to minimize the stoppage of the delivery device. However, if, for some reason, the state in which the amount of grain output by the sending device is larger than the amount of grain supply from the transport means continues and the amount of stored grain is smaller than a set lower limit, If it is left as it is, the blow-by of the hot air will occur, so in order to avoid this, the sending-out device is stopped until the kernel storage amount becomes larger than the set level for operation start, and the kernel storage amount is quickly increased. When the kernel storage amount becomes larger than the set level for starting operation, the delivery device is driven.

[0006]

According to the present invention, as described above, it is possible to minimize the decrease in the grain storage amount from the set lower limit,
The stoppage of the delivery device is avoided as much as possible, so that the efficiency of the grain drying operation can be improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a cargo receiving tank 1 (an example of a grain storage unit) that receives and temporarily stores grains (specifically, paddy). Below this, a belt conveyor 2 whose transfer speed can be changed (transfer stop is also possible) under the control of the drive unit 2a, transfers the grains from the load receiving tank 1 to a dryer 3 (more specifically, the It is arranged as a part of the conveying means A which conveys to supply the grain to the upper grain receiving portion 3a). The receiving tank 1 is provided with a valve 1a at its lowermost portion. By opening the valve 1a, the grains in the receiving tank 1 are supplied onto the belt conveyor 2. After the grains supplied to the belt conveyor 2 are conveyed by the belt conveyor 2, the grains are received by the remaining components of the conveying means A (a conveying device such as a bucket conveyor). It is supplied to the section 3a.

The dryer 3 passes the grains stored in the grain receiving portion 3a downward together with the grain receiving portion 3a which is the uppermost portion of the dryer 3 as described above. A drying unit 3b for blowing hot air through the passing grain to dry the grain, and a driving unit provided below the drying unit 3b to send the grain that has passed through the drying unit 3b to the outside of the dryer 3. Intermittent sending device 3c (specifically, a rotary valve)
And In the dryer 3, the grain is subjected to a drying process based on the passage of the grain through the drying unit 3b, and the grain after the process is sent out of the dryer 3 by the sending device 3c. After that, it is transported to a position of a silo (not shown) through a transporting device (constituted by a transporting device such as a bucket conveyor) having the same configuration as the transporting device A, and supplied into the silo And stored there.

The dryer 3 is provided with a supply control device according to the present invention. The supply amount control device includes a storage amount detection unit S that detects the kernel storage amount (the kernel storage amount in the kernel receiving unit 3a), and maintains the kernel storage amount within a set range. The transfer speed of the transfer device A is automatically increased or decreased (including stop) based on the detection information of the storage amount detection means S, and the sending device 3
and a supply amount adjusting means B for intermittently driving the drive c.

The storage amount detecting means S is specifically composed of the following four sensors S ₁ , S ₂ , S ₃ , S ₄ . That is, the inside of the load receiving tank 1, the upper limit detection sensor S ₁ that the grain storage amount is detected whether is greater than an upper limit corresponding to the full state, corresponding its grain storage amount is substantially empty the lower limit detecting sensor S ₂ for detecting the whether is smaller than the lower limit, they both sensors S _1, S ₂ pair which are arranged vertically spaced between the accumulated amount detecting sensor S _3, S ₄ , four sensors are provided, and the four sensors S ₁ , S ₂ , S ₃ , S ₄ constitute the storage amount detecting means S.

Each of the sensors S ₁ , S ₂ , S ₃ , S ₄ is of a pressure-sensitive type, and is configured to output an ON signal when a pressure greater than a set pressure is detected. That is, when the sensor is turned on, it is detected that the grain storage amount is above the sensor installation location, and when the sensor is turned off, it is detected that the grain storage amount is below the sensor installation location. It is supposed to be.
In the following description, it referred to as a first storage amount detection sensor S ₃ for detecting the first storage amount sensors of the upper detection sensor S ₁ side of the pair of storage amount detection sensor S _3, S _4, the sensor of the lower limit detection sensor S ₂ side is referred to as a second storage amount detection sensor S ₄ for detecting the second storage amount. The first
Accumulated amount detection sensor S ₃ is as described below, the delivery device 3c
It also functions as means for detecting whether or not it is at the set level at which the operation is started.

In the supply amount control device of the present invention, the control device 4 using a microcomputer is used to control the operation of each part based on the detection information of each of the sensors S ₁ , S ₂ , S ₃ , S _4. It is provided as supply amount adjusting means B. That is, the control device 4 as the supply amount adjusting means B
Controls the transport speed of the transport unit A (specifically, the belt conveyor 2) based on the detection information of the storage amount detection unit S so as to maintain the kernel storage amount within a set range. Stop control), and controls the driving of the sending device 3c.

Next, the operation of the control device 4 will be described with reference to the flowchart shown in FIG. First, the upper limit detection sensor S ₁ is based on whether the ON either OFF, the said grain storage amount is determined whether or not reached. When said upper limit sensor S ₁ is the grain storage amount becomes ON has reached the upper limit, closes the valve 1a of the load receiving tank 1, the belt conveyor 2
To stop. On the other hand, if the if the grain storage amount does not reach the upper limit, the lower limit sensor S ₂ is ON OF
It is determined whether or not the grain storage amount has reached the lower limit based on whether or not it is F. When said lower limit sensor S ₂ is the grain storage amount becomes OFF has reached the lower limit, stopping the delivery device 3c.

[0014] when the grain storage amount is between the upper and lower limits, the first accumulated amount detecting sensor S ₃ is based on whether a change to ON from OFF, the grain accumulated amount It is determined whether or not the small amount reaches the first storage amount close to the upper limit. When the kernel storage amount has reached the first storage amount, it is determined whether or not the sending device 3c is stopped. When the delivery device 3c is stopped, the delivery device 3c is driven. On the other hand, when the delivery device 3c is driven, the transport unit A is smaller than the throughput of the dryer 3. It is determined that the grain supply amount (the supply amount to the grain receiving portion 3a) is large, and the conveying speed of the belt conveyor 2 is reduced to minimize the stoppage of the belt conveyor 2, and The amount of grain supply is to be reduced.

[0015] If the no more than grain accumulation volume is the first storage amount, the first accumulated amount detecting sensor S ₃ is based on whether changes to OFF from ON, the grain accumulated amount It is determined whether or not the amount is smaller than the first storage amount. When the kernel storage amount is smaller than the first storage amount, it is determined whether or not the belt conveyor 2 is stopped. When the belt conveyor 2 is stopped,
If the belt conveyor 2 is not stopped while the belt conveyor 2 is driven, it is determined that the processing amount of the dryer 3 is larger than the grain supply amount, and the delivery device 3c is stopped. In order to minimize this, the conveying speed of the belt conveyor 2 is increased to increase the grain supply amount.

The amount of increase or decrease in the amount of grain supply in both cases described above is the amount of decrease in the case where the amount of kernel storage becomes smaller than the amount of first storage in the first storage. The amount is set to be larger than the increase amount α when the amount is reduced from large to small. The amount of the decrease is set to be smaller in the second time than in the first time and in the third time than in the second time. However, it is set to a constant value after the third time.

[0017] When the first storage amount detection sensor S ₃ is no ON / OFF changes be in ON state or OFF state based on the ON / OFF change of the second accumulation amount detecting sensor S _4, wherein An increase or decrease with respect to the level of the second storage amount is determined. Then, the second storage amount detection sensor S ₄ is turned off.
When the grain storage amount is changed from F to ON and the kernel storage amount is larger than the second storage amount, the conveying speed of the belt conveyor 2 is reduced to decrease the kernel supply amount. on the other hand,
The second accumulation amount detecting sensor S ₄ is changed to OFF from ON, when said grain storage amount is decreased from the second storage volume, the grain by accelerated transport speed of the belt conveyor 2 Increase the grain supply.

The amount of increase or decrease in the amount of grain supply in both cases described above is the amount of increase in the case where the amount of kernel storage becomes smaller than the amount of second storage in the second storage. The amount is set to be larger than the decrease amount β when the amount increases from small to large. The amount of increase is set to be smaller in the second time than in the first time and in the third time than in the second time. However, it is set to a constant value after the third time.

[0019] When the second accumulation amount detecting sensor S ₄ is no ON / OFF changes be in the ON state or the OFF state, to maintain the current adjustment state. Then, the control device 4 repeats each process described above until the entire operation is completed.

It is to be noted that the amount of decrease in the case where the amount of stored grains is larger than the first amount of storage is smaller than the amount of increase in the case where the amount of stored grains is smaller than the first amount of storage. Is also set to large, and the increase amount when the grain storage amount becomes large to small with respect to the second storage amount, when the grain storage amount becomes small to large with respect to the second storage amount. The reason for setting the amount larger than the reduction amount is that the grain storage amount is set to the first storage amount and the second storage amount so that the stop time of the belt conveyor 2 and the delivery device 3c is minimized. This is for the purpose of quickly returning to the state.

Next, another embodiment will be described. In the above-described embodiment, the case where the operation of the delivery device 3c is restarted when the kernel storage amount has recovered to the first storage amount on the upper limit side has been described, but it is larger than the second storage amount. The operation may be restarted at the time of recovery.

Further, in the above embodiment, in order to detect whether or not the kernel storage amount is within the set range, an interval is provided between the upper limit sensor S ₁ and the lower limit sensor S _2. Although the case where two sensors S ₃ and S ₄ are provided is illustrated, for example, one sensor is provided between the upper limit sensor S ₁ and the lower limit sensor S _2.
A plurality of sensors may be provided, and the attachment points of the sensors may be set to the intermediate setting level and the setting level for starting the operation of the sending device 3c. However, the increase side is set to a value larger than the decrease side.

An embodiment is also conceivable in which the supply of grains to the dryer is performed from a grain storage unit (for example, a silo) other than the cargo receiving tank 1. Further, it goes without saying that the specific configuration of each unit required for carrying out the present invention can be variously changed according to the structure of the dryer.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a supply amount control device according to the present invention together with a dryer.

FIG. 2 is a flowchart showing a control operation of a supply amount control device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grain storage part 3 Dryer 3a Grain receiving part 3b Drying part 3c Sending device A Conveying means B Supply amount adjusting means S Storage amount detecting means

Claims (1)

(57) [Claims] A grain receiving portion (3a) for receiving and storing grains supplied via a transport means (A) for transporting the grains from the grain storage portion (1) at a variable transport speed. And a drying section (3b) for passing the grains stored in the grain receiving section (3a) downward and drying by passing hot air through the passing grains. A storage unit for storing the grain in the grain receiving unit (3a), wherein the drying unit (3c) is provided under the drying unit (3b) to send out the grain that has passed through the drying unit (3b). And a transfer speed of the transfer means (A) based on detection information of the storage amount detection means (S) so as to maintain the storage amount within a set range. Increase and decrease, and
A supply amount control device for a dryer comprising: a supply amount adjusting means (B) for intermittently driving the sending device (3c). Whether it is smaller or not, whether it is larger or smaller than an intermediate set level set to a value larger than the set lower limit, and larger than a set level for starting operation of the sending device (3c). Is configured to be able to detect whether or not
The supply amount adjusting means (B) stops the sending device (3c) as the storage amount becomes smaller than the set lower limit, and the storage amount is larger than the operation start set level. , The storage amount is increased from a small value to a large value with respect to the intermediate set level only when the transmission device (3c) is driven and only when the transmission device (3c) is in a driving state. The transfer speed of the transfer means (A) is reduced by a first set amount along with the transfer, and the transfer of the transfer means (A) is performed as the storage amount becomes smaller than the intermediate set level. A supply control device for a dryer configured to increase the speed by a second set amount set to a value larger than the first set amount.