JPH03113278A - Dry control system for grain dryer - Google Patents

Abstract

PURPOSE:To reduce drying time in dehumidification drying by drying with hot air by a burner air unit the temperature of grains rises to a specified temperature from the start of drying, halting the heating of the burner after the temperature has risen to the specified temperature, and drying with dehumidified air by a dehumidification device. CONSTITUTION:When hot air flows from a hot air chamber 13 across a drying chamber 1 and absorbed and discharged out by an exhauster 8 by way of an exhaust chamber 14, this action forces the grains stored in a storage chamber 16 to be exposed by this hot air when flowing through the drying chamber 1 and then dried up. More specifically, when an attempt is made to detect the specified grain temperature which exceeds 38 deg.C, a drying control device operates to halt the operation of a burner under control and suspends combus tion. At the same time, a dehumidification device starts so as to generate dehu midified air which is repeated so that the grains may be exposed and dried up. When a moisture sensor detects the moisture of grains which is equivalent to a finishing target moisture set by operating a moisture setting control, the drying control device for an operation device controls a dryer 4 and suspends its operation automatically and stops the drying of the grains.

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 repeatedly circulated through a drying chamber and flowed down, while either hot air generated from a burner or dehumidified air generated from a dehumidifier was used to fill this drying chamber from the start to the end of drying. This is a drying method in which the grains flowing down the drying chamber are exposed to the drying wind of either of these dryers and are dried, and either the burner or the dehumidifier is installed. It was a drying control method in which grains were dried using a grain dryer.

Problems to be Solved by the Invention While the grains are repeatedly circulated through the drying chamber and flowed down,
For example, dehumidified air generated from a dehumidifier and having a temperature several degrees higher than the outside air passes through the drying chamber, and the grains flowing down the drying chamber are exposed to the dehumidified air and dried.

At the start of this drying, the temperature of the dehumidified air generated from the dehumidifying device is low, so that the temperature of the grains does not rise well in the early stage of drying, and therefore the drying efficiency may not improve.

Means for Solving the Problems The present invention provides a grain dryer in which grains are dried by passing hot air generated from a burner 2 or dehumidified air generated from a dehumidifying device 3 while letting the grains flow down into a drying chamber 1. From the start of drying until the grain temperature rises to a predetermined temperature, drying is performed with the hot air from the burner 2, and after the grain temperature rises above the predetermined temperature, the burner 2 is stopped and the dehumidifier 3
The drying control method is characterized in that drying is performed using the dehumidified air.

Effect of the Invention While the grains are repeatedly circulated through the drying chamber 1 and flowing down, the hot air generated from the burner 2 passes through the drying chamber 1, so that the grains flowing down inside the drying chamber 1 are exposed to this hot air. The grain temperature during drying is, for example,
When the temperature rises to 38°C, the burner 2 is stopped, and at the same time,
Dehumidified air whose temperature is several degrees higher than the outside air temperature is generated from the dehumidifier 3,
As this dehumidified air passes through the drying chamber 1, the grains flowing down in the drying chamber 1 are exposed to this dehumidified air and dried.

Effects of the Invention According to this invention, at the start of drying, the grains are dried with hot air generated from the burner 1, so that the grain temperature is raised to a predetermined grain temperature in a short time, and efficient drying is performed. The grains are dried in a state close to natural drying using dehumidified air from the dehumidifying device 3, thereby shortening the drying time in dehumidifying drying and at the same time making it possible to dry grains stably for one serving.

Embodiment On the ward side, the mechanism 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 structure includes an operating device 6 for starting and stopping the burner 2, etc., a burner case 7 in which the burner 2 is installed, and a dry air blowing chamber 26 in which the dehumidifier 3, etc. is installed. is an exhaust fan 8, and an exhaust fan motor 9 that rotationally drives this exhaust fan 8.
This configuration includes a valve motor 10, etc.

In the center of the lower part of the mechanism 5, there is provided a grain collection gutter 11 which is equipped with a transfer spiral in the front and back direction, and above the grain collection gutter 11, a drying chamber 1 formed between ventilation mesh plates is arranged in parallel. At the bottom of each drying chamber 1, a feed-out valve 12 for feeding and flowing grains is rotatably supported. The structure is configured such that the burner 2 or the dehumidifier 3 is communicated with the burner 2 or the dehumidifier 3 through the drying chamber 1, and an exhaust chamber 14 is formed outside each drying chamber 1 and communicated with the exhaust fan 8. Speed change mechanism 1 with motor 10
5, each delivery valve 12 is rotationally driven.

A storage chamber 16 is formed above each drying chamber 1 and communicated with the storage chamber 16,
A transfer gutter 17 in which a ceiling plate 28 and a transfer spiral are rotatably supported is provided on the upper side of the storage chamber 16, and a supply port for supplying transferred grains into the storage chamber 16 is provided in the center of the transfer gutter 17. A diffusion plate 18 is provided below the supply port to uniformly diffuse and return the grains into the storage chamber 16.

The grain elevating machine 19 is provided in front of the front wall plate, and inside thereof a packet conveyor 20 belt is stretched between upper and lower pulleys, and a discharging cylinder 21 is provided between the upper end and the starting end of the transfer gutter 17. A supply gutter 22 is provided between the lower end and the terminal end of the grain collecting gutter 11 for communication.
The grain elevator motor 23 installed on the top of 9 moves the packet conveyor 20 belt, the transfer spiral in the transfer gutter 17, and the spreader plate 18.
The transfer spiral in the grain collecting trough 11 is rotatably driven via the belt of the packet conveyor 20, and the moisture sensor 24 provided at the center in the vertical direction detects when the grain is being conveyed to the upper part by the packet conveyor 20. The structure is such that the grains falling on the ground are received, the grains are crushed under pressure, and at the same time, the moisture content of the crushed grains is detected. Each part of the moisture sensor 24 is rotationally driven by a moisture motor 25 provided inside. A grain temperature sensor 45 is provided in the supply gutter 22 to detect the temperature of the grains flowing down the feed gutter 22.

A fuel pump 27 having a fuel valve is provided on the outside of the lower plate of the burner case 7, and the fuel pump 27 sucks fuel in the fuel tank 29 and supplies it to the burner 2 by opening and closing the fuel valve. A blower 30 and a blower motor 31 that rotate at variable speeds are provided on the outside of the upper plate, and the blower motor 31 rotates to drive the blower 30 to supply combustion air to the burner 2 in an amount commensurate with the amount of fuel to be supplied.
The front wall plate of the burner case 7 is provided with an inlet 34 for sucking in outside air during combustion in the burner 2, and the inlet 34 has a rotating mechanism for opening and closing the inlet 34. A movable closing plate 32 is provided, and this closing plate 32 is configured to be opened and closed by the operation of a solenoid 33, and the hot air generated from the burner 2 passes through the dry air blowing chamber 26 and into the blowing chamber 13 on the rear wall plate. This configuration is provided with an air blowing port 35 for supplying air to the air.

The dehumidifier 3 is provided on the lower side of the burner case 7, and the dehumidifier 3 has a box shape and has an inlet 36 on the front wall plate of the box for sucking in outside air during heat exchange in the dehumidifier 3. , and the rear wall plate is provided with an air outlet 37 through which outside air is converted into dehumidified air within this dehumidifier 3 and this dehumidified air is supplied into the air blowing chamber 13 via the dry air blowing chamber 26. The suction port 36 is provided with a rotatable closing plate 38 that opens and closes the suction port 36, and this closing plate 38 is configured to open and close by the operation of a solenoid 39. A compressor 40 circulates and converts the refrigerant from low-temperature, low-pressure gas to high-temperature, high-pressure gas, high-temperature, high-pressure liquid, and low-temperature, low-pressure liquid in order to exchange the dehumidified outside air with dehumidified air that has a temperature several degrees higher than the outside air temperature.
, a compressor motor 41 for rotationally driving the compressor 40, a condenser 42, an expansion valve 43, and an evaporator 44 are provided.

The operating device 6 has a box shape, and the dryer 4, the burner 2, and the dehumidifier 3 are installed on the surface plate of the box.
Start switch 4 for starting each drying and discharge operation separately
6. A stop switch 47 for stopping operation, a temperature setting switch 48 for setting the temperature of the hot air and dehumidifying air generated from the burner 2 and the dehumidifying device 3 according to the operation position of the grain type and the amount of grain being loaded, a moisture setting switch 49 for setting the finishing target moisture depending on the operating position; a display window 51 for alternately displaying the grain moisture detected by the moisture sensor 24; each hot air temperature detected by the hot air temperature sensor 50; and the remaining drying time. The structure is equipped with a monitor, etc., and a drying control device 52, a temperature control device 53, etc. are provided inside, and each setting 48, 49 is a rotary switch type, and a predetermined value is set depending on the operating position. This is the configuration in which .

The drying control device 52 includes an A-D converter 54 that converts the detected values detected by the moisture sensor 24 and the grain temperature sensor 45 into A-D converters, and the converted values converted by the A-D converter 54 are inputted thereto. an input circuit 55 to which the respective switches 46, 47 and the moisture setting switch 49 are input. The configuration includes a CPU 57 that performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits 55 and 56, and an output circuit 58 that receives and outputs various commands issued from the CPU 57.

The temperature control device 53 is an A-D converter that converts the detection value detected by the hot air temperature sensor 50 into A-D converter.
An input circuit to which the converted value converted by the D converter is input, an input circuit to which the operation of each temperature setting 48 is input, and various input values input from these input circuits are subjected to arithmetic and logical operations and comparison operations. The CPU 57, this CPU 5, which performs
This configuration is provided with an output circuit 58 that receives and outputs various commands issued from 7.

The drying control by the drying control device 52 is performed as follows. When the moisture setting switch 49 is operated, this operating position is input to the CPU 57, and the finishing target moisture of the grain is set by this input. The grain moisture detected by the moisture sensor 24 is input to the CPU 57, the input detected grain moisture is compared with the set finishing target moisture, and when the detected grain moisture becomes the same as the finishing target moisture, this drying process is completed. The dryer 4 is automatically controlled by a control device 52 to automatically stop the dryer 4.

When the start switch 46 is operated to start the drying operation, this operation is input to the CPU 57, and drying of the grains is started by this input. At the start of this drying, the burner 2 is started and the The set hot air set by operating each temperature setting knob 48 is generated, and the grains are exposed to the set hot air temperature and dried. The detected grain temperature is detected by the grain temperature sensor 45 and inputted to the CPU 57 at time intervals, and the detected grain temperature is compared with a set grain temperature of 38° C., for example, which is set and stored in the CPU 57. When the grain temperature becomes equal to or higher than the set grain temperature, the drying control device 52 automatically controls the burner 2 to stop combustion, and at the same time the dehumidification device 3 is started, and the dehumidification device 3 starts the CPU 57. Dehumidified air is generated at the set humidity and temperature that have been set and stored, and the grains are dried by being exposed to this dehumidified air.

Temperature control by the temperature control device 53 is performed as follows. When each temperature setting knob 48 is operated, this operating position is input to the CPU 57, and this input changes the temperature of the hot air generated from the burner 2. is set, and when the burner 2 is in combustion, the hot air temperature sensor 50
The temperature of the hot air generated from the burner 2 detected by the CPU
57, the input detected hot air temperature and the set hot air temperature are compared, and if they are different, the fuel valve and the fuel pump 27 are connected so that the detected hot air temperature becomes the same as the set hot air temperature. The amount of fuel supplied to the burner 2 is controlled, and when heat exchange is performed in the dehumidifying device 3, the temperature of the dehumidified air generated from the dehumidifying device 3 detected by the hot air temperature sensor 50 is and humidity are the CPtJ57
The input detected dehumidifying air temperature and humidity are compared with the set dehumidifying air temperature and humidity, and if they are different, the intake air volume is adjusted so that the detected dehumidifying air temperature becomes the same as the set dehumidifying air temperature. is controlled, and the rotation speed of the compressor motor 41 is controlled so that the rotation of the compressor 40 is controlled so that the detected dehumidifying air humidity becomes the same as the set dehumidifying air humidity.

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

Each part of the grain dryer 4, the burner 2, the moisture sensor 24, etc. are started by operating each setting switch 48, 48, 49 of the operating device 6 to a predetermined position and operating the start switch 46 that starts drying. Hot air is generated from the burner 2, passes through the drying chamber 1 from the hot air chamber 13, passes through the exhaust chamber 14, is sucked and exhausted by the exhaust fan 8, and is stored in the storage chamber 16. The dried grains are dried by being exposed to the hot air while flowing down from the storage chamber 16 into the drying chamber 1, and are delivered to the lower part by the delivery valve 12 and flowed down from the grain collecting trough 11 to the supply trough. 22 and into the grain hoisting machine 19 by a lower transfer spiral, then transported to the upper part by a packet conveyor 20, passed through a dispensing cylinder 21, and is supplied into a transfer gutter 17, and from this transfer gutter 17 onto a spreading plate 18. The grain temperature detected by the grain temperature sensor 45 is set and stored, for example, the set grain temperature 38. When detecting temperature above ℃,
The drying control device 52 automatically controls the burner 2 to stop combustion, and at the same time, the dehumidifying device 3 is started and dehumidifying air is generated from the dehumidifying device 3. The grains that are repeatedly circulated are exposed and dried, and when the moisture sensor 24 detects the same grain moisture as the finishing target moisture set by operating the moisture setting switch 49, the drying control of the operating device 6 is performed. The dryer 4 is automatically stopped under automatic control by the device 52, and the drying of the grains is stopped.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a partially cutaway overall side view of the grain dryer, and Fig. 3 is a cross section taken along line A-A in Fig. 2. Figure 4 is B of Figure 2.
-E sectional view, Figure 5 is a rear view of a part of the grain dryer, Figure 6 is a rear view of a part of the grain dryer.
The figure is a partially cutaway front view of a part of the grain dryer. Explanation of symbols ■ Drying room 2 Burner 3 Dehumidifier

Claims (1)

[Claims] In a grain dryer that dries grains by passing hot air generated from a burner 2 or dehumidified air generated from a dehumidifier 3 while letting the grains flow into a drying chamber 1, the grain temperature rises to a predetermined temperature from the start of drying. Until then, the grains are dried with the hot air from the burner 2, and after the grain temperature rises above the predetermined temperature, the burner 2 is stopped and the grains are dried with the dehumidified air from the dehumidifier 3. Drying control method.