JPH03102188A - Dry control system for cereals drier - Google Patents

Abstract

PURPOSE:To improve a drying efficiency and to effectively use a humidifier by controlling to sequentially reduce atmospheric air volume to be sucked from an atmospheric air suction port based on lapse time from a start of drying or moisture of cereals and drying the cereals. CONSTITUTION:When a start switch 37 is operated, mixed dehumidifying dry air of dehumidifying air generated from a dehumidifier 2 and atmospheric air sucked from an atmospheric air suction port 3 is transversely passed from an air flow chamber 12 into a drying chamber 1 through an air discharge chamber 14, sucked and discharged by an air discharger 7. Thus, cereals contained in a storage chamber 17 are exposed with hot blast during flowing down from the chamber 17 through the chamber 1, and dried. Air volume of the atmospheric air sucked from the part 3 of the mixed humidifying dry air is controlled to a state sequentially narrowed by a speed shifting motor 31 according to the moisture of the cereals detected by a moisture sensor 26 during lapse time from the start of drying to a timer 33 during drying, and the cereals are exposed with the mixed dehumidifying dry air controlled to be reduced in the air volume of the atmospheric air, and dried. Accordingly, its drying efficiency is improved.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a drying control method for a grain dryer.

Conventional technology In the past, grains were fed into a drying room and allowed to flow down, while drying was carried out by passing mixed dehumidified drying air, which is a mixture of dehumidifying air from a dehumidifying device and outside air sucked in from an outside air inlet. The drying control method was used to dry by controlling the outside air volume of the mixed dehumidified drying air during drying to a constant air volume without changing it depending on the elapsed time from the start of drying or the moisture content of the grains during drying.

Problems to be Solved by the Invention While the grain is repeatedly circulated through the drying chamber of the grain dryer and flowing down, dehumidified air from the dehumidifier is sent to the drying chamber.
By passing the mixed dehumidified drying air mixed with the outside air taken in from the outside air inlet, the grains flowing down in the drying chamber are exposed to the mixed dehumidified drying air and dried.

During this drying process, when the moisture content of the grains is high in the early stage of drying, ventilation drying can achieve a certain degree of drying, which increases the intake of outside air during the early stage of drying to increase the drying effect and save energy. After that, when the grain moisture decreases and approaches the equilibrium moisture content, the outside air volume of the mixed dehumidifying drying air is reduced, and this mixed dehumidifying drying air is turned into a low dehumidifying air to improve drying efficiency. This is an attempt to make effective use of this dehumidification device.

Means for Solving the Problems This invention ventilates mixed dehumidified dry air, which is a mixture of the dehumidified air from the dehumidifying device 2 and the outside air taken in from the outside air intake port 3, while letting the grains flow into the drying chamber l. The grain dryer installed to dry the grains is characterized in that the amount of outside air sucked in from the outside air intake port 3 is controlled to decrease sequentially based on the elapsed time from the start of drying or the moisture content of the grains. The drying control method is configured as follows.

Effects of the Invention While the grain is repeatedly circulated through the drying chamber 1 of the grain dryer and flowing down, the drying chamber 1 receives dehumidified air generated from the dehumidifying device 2 and outside air sucked from the outside air intake port 3. The drying chamber 1
While flowing down, the grains are exposed to this mixed dehumidified drying air and dried.

During this drying operation, the outside air volume of the mixed dehumidified drying air is gradually reduced depending on the elapsed time from the start of drying or the decrease in grain moisture. For example, when the finishing target moisture is near, this outside air volume is controlled so that it is not sucked. The grains are dried using mixed dehumidified drying air.

Effects of the Invention According to the present invention, the outside air volume of the mixed dehumidified drying air passing through the drying chamber 1 is controlled to be sequentially reduced depending on the elapsed time from the start of drying or the moisture content of the grains, and this control results in a mixed dehumidified drying with low humidity. By drying the grains with the wind, drying energy can be used effectively and the efficiency of drying the grains can be improved.

Embodiment In the illustrated example, the machine wall 5 of the grain dryer 4 has a rectangular shape that is long in the front and back direction and is made up of front and rear wall plates and left and right wall plates. The configuration includes an operating device 6 for starting and stopping the dryer 4, and the rear wall plate includes an exhaust fan 7, a variable speed exhaust fan motor 8 for driving the exhaust fan 7 to rotate at variable speeds, and an operating device 6 for starting and stopping the dryer 4. This configuration includes a valve motor 9 and the like.

At the center of the lower part of the machine wall 5, there is provided a grain collection gutter 10 in which a transfer spiral is rotatably installed in the front-rear direction, and on the upper side of this grain collection gutter 10, a drying chamber L formed between ventilation mesh plates is arranged in parallel. At the bottom of each drying chamber 1, a feeding valve 11 for feeding and flowing grains is rotatably installed. are in communication with each other, and a temperature sensor 13 is provided inside this ventilation chamber 12 to detect the temperature of the mixed dehumidified dry air in this ventilation chamber 12. A wind chamber 14 is formed and communicated with the exhaust fan 7, and each delivery valve 11 is rotatably driven by the valve motor 9 via a speed reduction mechanism 15. A storage chamber 1 is provided above each drying chamber 1.
A transfer gutter 19 equipped with a ceiling plate 18 and a transfer spiral is provided on the upper side of this storage chamber 17, and a transfer gutter 19 is provided in the center of this transfer gutter 19 to supply grains to be transported into this storage chamber 17. A supply port is provided, and the storage chamber 17 is provided below the supply port.
It has a configuration in which a diffusion plate 20 is provided to uniformly diffuse and return the grains.

The grain elevating machine 21 is provided in front of the front wall plate, and inside thereof a packet conveyor 22 belt is stretched between the upper and lower pulleys, and between the upper end and the starting end of the transfer gutter 19 is a discharging cylinder 23. A supply gutter 24 is provided between the lower end and the terminal end of the grain hoist 10 for communication.
The grain elevator motor 25 installed on the upper part moves the packet conveyor 22 belt, the transfer spiral in the transfer gutter 19, and the spreader plate 2.
0 and the transfer spiral in the grain collecting trough IO are rotated via the packet conveyor 22 belt, and a moisture sensor 26 provided approximately at the center in the vertical direction transfers the packet 1 to the upper part by the conveyor 22 belt. It receives grains that fall during transportation, crushes the grains under pressure, and at the same time detects the moisture content of the crushed grains.A moisture motor 27 provided inside this moisture sensor 26 is connected to The moisture sensor 26 is rotated by the transmission of the electric measurement signal f3, and each part of the moisture sensor 26 is rotationally driven by the rotation of the moisture motor 27.

The dehumidifying device 2 has a box shape and has an inlet 28 on the front wall plate of the box body for sucking outside air. The structure is such that the outside air is converted into dehumidified air, and the ceiling board is provided with an outside air inlet 3 that takes in outside air. It has a configuration in which a ventilation port 29 through which mixed dehumidified dry air is supplied into the ventilation chamber 12 is provided in the rear wall plate, and an on-off valve 30 that can be opened and closed is provided in the outside air intake port 3. It is configured to be opened and closed by a variable speed motor 31 that rotates in forward and reverse directions, and at the same time as this opening/closing valve 30 is controlled to be in an open state, the rotation speed of the exhaust fan 7 is controlled to increase its rotational speed, and air is discharged from the outside air intake port 3. The intake air volume is controlled to increase, and contrary to the above, the opening/closing valve 30 is controlled to be closed, and at the same time, the rotation speed of the exhaust fan 7 is controlled to reduce the rotation speed to increase the amount of the outside air. The configuration is such that the amount of outside air taken in from the suction port 3 is controlled to decrease, and the amount of outside air taken in from the suction port 28 does not change even if the rotational speed of the exhaust fan 7 changes.
The dehumidifier 2 converts the outside air sucked in from the suction port 28 into dehumidified air, and the dehumidifier 2 contains refrigerants such as low-temperature low-pressure gas, high-temperature high-pressure gas, high-temperature high-pressure liquid, and low-temperature low-pressure liquid. A compressor 32 that converts while circulating, a compressor motor 33 that rotationally drives this compressor 32, and a condenser 34.
, an expansion valve 35, an evaporator 36, and the like.

The operation bag holder 6 is box-shaped, and the dryer 4 and the dehumidifier 2 are mounted on the surface plate of the box, and a start switch 37 is used to start and stop the drying and discharging operations separately. A stop switch 38, a moisture setting switch 40 that sets the grain finishing target moisture depending on the operating position, a display window 4l and a monitor display that alternately displays the detected mixed dehumidified drying air temperature, detected grain moisture, remaining drying time, etc. The structure includes a drying control device 42, a temperature control device 43, and a timer 44 for setting the elapsed time from the start of drying, and the moisture setting control 4o is a rotary switch type. There is a configuration in which a predetermined value is set depending on the operating position. The drying control device 42 includes an A-D converter 45 that converts the detection value detected by the moisture sensor 26 from A to D;
An input circuit 4 into which the converted value converted by the converter 45 is input.
6. The switches 37 and 38, the input circuit 47 into which the operation of the moisture setting control 40 is input, the input circuit 47 into which the input value to be input to the timer 44 is input, and each of these input circuits 46 and 47. A CPU 48 that performs arithmetic and logical operations, comparison operations, etc. on various input values input from the CPU 48. This CPU4
Output circuit 4 that receives various commands from 8 and outputs them.
9 is provided.

The temperature control device 43 includes an A-D converter that converts the detected value detected by the temperature sensor {3 into A-D, an input circuit into which the converted value converted by the A-D converter is input, and each input circuit. The configuration includes a CPU 48 that performs arithmetic and logical operations, comparison operations, etc. on various input values input from the circuit, and an output circuit 49 that receives and outputs various commands from the CPU 48.

The drying control and drying stop control by the drying control device 42 are performed as described below. When the moisture setting switch 40 is operated, this operating position is input to the CPU 48, and the grain finishing target is set by this human power. Moisture is set, and the grain moisture detected by the moisture sensor 26 is
48, this input detected grain moisture is compared with the finishing target moisture, and if the same grain moisture as the finishing target moisture is detected by the moisture sensor 26, this drying control device 42
The dryer 4 is automatically controlled and automatically stopped.

When the dehumidifying air capacity of the dehumidifying device 2 satisfies the mixed dehumidifying drying air Q, settings are made and stored in the CPU 48 as shown in FIGS. 2 and 3 based on the elapsed time from the start of drying and the grain moisture content. As shown in FIG. 2, when the time has elapsed, the mixed dehumidified dry air Q is selected from the dehumidified air Q2 generated from the dehumidifier 2 and the outside air Q+ taken in through the outside air intake port 3. For example, when A time has passed since the start of drying, the temperature of the mixed dehumidifying drying air Q is 27°C, as shown in the table below.
The configuration is such that the humidity is 60% and the air flow is 0.55 m''/sec, as shown in the table below, where the dehumidified air Q2 and outside air Q1 are controlled, and when time B has elapsed, the air is mixed as shown below. The temperature of the dehumidifying dry air Q is 30℃, the humidity is 30%, and the air volume is 0.55 m"/s
ec, as shown in the table below, the dehumidifying air Q2 and the outside air Q
, and are controlled, and as shown in FIG. 3, when the grain moisture is low, the mixed dehumidifying drying wind Q is selected from the dehumidifying wind Q2 and the outside air wind Q1, and when the grain moisture is 30%, As shown in the table below, the temperature of the mixed dehumidifying and drying air Q is 27℃, the humidity is 60%,
As shown in the table below, the dehumidifying air Q and outside air air Q are controlled so that the air volume is 0.5 m''/sec. As shown in the table below, the temperature of the mixed dehumidifying dry air Q is 27°C, and the humidity is 40%, and the air volume is 0.5 rri'/sec.
This is a configuration in which the air flow Q and the outside air Q are controlled.

A mixed dehumidifying drying wind Q is selected from the dehumidifying wind Q generated from the device 2 and the outside air wind Q taken in from the outside air intake port 3. For example, when E time has elapsed since the start of drying, the following The temperature of the mixed dehumidifying dry air Q is 27℃, the humidity is 60%,
As shown in the table below, the dehumidifying air Q2 and the outside air air Q are controlled so that the wind speed is 0.45 rn'/sec, and the dehumidifying air capacity of the dehumidifying device 2 is controlled to be 0.45 rn'/sec. When the wind Q is not satisfied, the configuration is set and stored in the CP048 as shown in Figures 4 and 5 according to the elapsed time from the start of drying and the grain moisture. 4
As shown in the figure, when the dehumidification F time elapses, as shown in the table below,
As shown in the table below, the temperature of the mixed dehumidifying and drying air Q is 30°C, the humidity is 30%, and the air volume is 0.2rr1''/sec.
The structure is such that the dehumidifying wind Q and the outside air Q1 are controlled, and as shown in Fig. 5, when the grain moisture is present, the dehumidifying wind Q and the outside air wind Q are
, and the mixed dehumidifying drying wind Q is selected, and the grain moisture is 30%.
In this case, as shown in the table below, the temperature of the mixed dehumidifying and drying air Q is 27
℃, humidity is 60%, and air volume is 0. The dehumidifying air Q and outside air Q1 are controlled so that the drying speed is 45 m"/sec as shown in the table below. When drying progresses and the grain moisture content is 15%, the mixed dehumidifying drying is performed as shown in the table below. The temperature of wind Q is 27℃,
The configuration is such that the dehumidifying air Q. and the outside air air Q are controlled so that the humidity is 30% and the air flow is 0.2 rn''/sec, as shown in the table below.

Temperature control by the temperature control device 43 described in iii.
The detected temperature is compared with the set temperature that has been set and stored in
The rotation speed of the compressor 32 is controlled to control the rotation speed of the compressor 32, and as described above, the elapsed drying time and grain moisture are input, and the temperature and humidity of the mixed dehumidified dry air are selected. In this case, this control is given priority. Note that FIG. 1O and parts of FIGS. 1 and 6 are views showing other embodiments, and as shown in FIGS. 1O and 1, the hot air chamber 1
A pressure sensor 50 for detecting the pressure (P in) inside the dehumidifier 2 is provided on the front wall plate, and the air volume of the mixed dehumidified dry air Q generated from the dehumidifier 2 is detected based on the pressure detected by the pressure sensor 50. The force detected by the pressure sensor 50 is manually inputted to the CPU 48, the flow rate of the mixed dehumidifying dry air Q is detected by this input, and this detected value is compared with the air flow rate set and stored in the CPU 4B. The forward/reverse rotation time of the variable speed motor 31 is controlled, and the opening/closing position of the on-off valve 30 is controlled so that the open/close position of the on-off valve 30 is controlled so that the open/close position of the open/close valve 30 is controlled so that the open/close position of the open/close valve 30 is adjusted so that the open/close rotation time of the variable speed motor 31 becomes the same as the set wind. The air flow rate 01 is controlled by the drying control device 42 so that the air flow rate of the mixed dehumidified drying air Q that crosses and passes through the drying chamber 1 is always the same. It is also possible to have a configuration in which they are the same.

Hereinafter, the operation of the above embodiment will be explained.

By operating the moisture control knob 40 of the operating device 6 to a predetermined position and operating the start switch 37 to start drying,
Each part of the grain dryer 4, the dehumidifier 2, the moisture sensor 26, etc. are started, and the dehumidified air generated from the dehumidifier 2 and the outside air sucked from the outside air intake port 3 are mixed to become a mixed dehumidified dry air. , this mixed dehumidified dry air flows from the ventilation chamber 12 to the drying chamber 1.
The grains stored in the storage chamber 17 are absorbed by the hot air while flowing down from the storage chamber 17 through the drying chamber 1. The grains are exposed and dried, are fed out to the lower part by the feed valve 1l, flow down, are transferred from the grain collection gutter 10 through the feed gutter 24 into the grain hoisting machine 2l by the lower transfer spiral, and are fed to the packet conveyor 22.
It is conveyed to the upper part and supplied into the transfer gutter 9 through the dispensing tube 23, and from this transfer gutter l9, it is transferred and supplied onto the diffusion plate 20 by the upper transfer spiral, and from this diffusion plate 20 into the storage chamber l7. The moisture sensor 26 is evenly distributed, circulated and dried.
When the grain moisture content is the same as the finishing target moisture set by operating the moisture setting controller 40, the drying control device 42 of the operating device 6 automatically controls the drying machine 4 to automatically stop the grain moisture. Stop grain drying.

During this drying work, the outside air drawn from the outside air intake port 3 of the mixed dehumidified drying air is determined by the elapsed time input to the timer 44 from the start of drying or by the grain moisture detected by the moisture sensor 26. The open air volume of the opening/closing valve 30 is controlled so that the open state of the on-off valve 30 is gradually narrowed by the variable speed motor 31, and the outside air volume is dried by being exposed to the mixed dehumidifying and drying air whose volume is controlled to decrease.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, and FIG. 1 is a block diagram, FIG. 2 is a relationship between drying time and air volume, FIG. 3 is a relationship between grain moisture and air volume, and FIG. The diagram shows drying time and air volume.
Figure 5 is a diagram of the relationship between grain moisture, air volume, and exhaust fan rotation speed, Figure 6 is an overall top view of the grain dryer, and Figure 7 is a diagram of the relationship between grain moisture, air volume, and exhaust fan rotation speed. Figure 8 is a rear view of a part of the grain dryer, Figure 9 is a partially cutaway front view of a part of the grain dryer, and Figure 10 is another embodiment. FIG. 10 is a flowchart. Explanation of symbols 1 Drying room 2 Dehumidifier 3 Outside air inlet

Claims (1)

[Claims] A grain dryer installed to dry grains by blowing mixed dehumidified drying air, which is a mixture of dehumidifying air from a dehumidifying device 2 and outside air taken in from an outside air intake port 3, while letting the grains flow into a drying chamber 1. A drying control method characterized in that drying is carried out by sequentially controlling and decreasing the amount of outside air taken in from the outside air intake port 3 based on the elapsed time from the start of drying or grain moisture.