JPH03236591A - Control system for drying in grain drying machine - Google Patents

Abstract

PURPOSE:To prevent the misfire of a burner and improve combustion efficiency by a method wherein the number of operating sets of hot air device is controlled so as to be reduced to dry grain when the set hot air temperature of the hot air device is higher than an atmospheric temperature within the range of a predetermined temperature. CONSTITUTION:A set hot air temperature, set in accordance with the charging amount of grain and the like, is generated by the burner of a hot air device 3 provided for each drying chambers 2 separately while the hot air is induced and discharged by an exhaust fan 4 provided in respective drying chambers 2 separately whereby it crosses and passes through respective drying chambers 2 and grains, which flows down, are exposed to and dried by the hot air. During this drying work, a set hot air temperature, generated by the burner, is compared with the atmospheric temperature to operate the heating temperature of the burner and when the operated heating temperature is within a predetermined temperature range, two sets of fans among three sets of the same, for example, are operated and the operation of one set of the same is stopped. In order not to reduce the mean drying of the grains, the set hot air temperature of the operating two sets of burners is controlled so as to be higher than the set hot air temperature of the burners when three sets of the burners are being operated.

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, while grains were flowing down from the storage chamber in the upper part to the drying chambers in multiple upper and lower stages in the lower part, the hot air equipment installed in each drying chamber was used to set the amount of grains to be loaded from the burner, for example. The set hot air temperature is generated, and this hot air passes through this drying room and is sucked out to the outside of the machine by the exhaust fan installed in each drying room, thereby removing the grain flowing through each drying room. This is a drying control method in which the grains are dried by being exposed to this hot air, and is not a drying control method in which drying is performed by controlling the number of operating burners by heating the hot air generated from the burner.

Problem to be Solved by the Invention Grain is repeatedly circulated from an upper storage chamber to a plurality of lower drying chambers and flowing down. A set hot air temperature is generated depending on the grain size, etc., and this hot air is individually sucked and exhausted by the exhaust fan installed in each drying room, and passes through each drying room. The grains flowing down are exposed to this hot air and dried.

During this drying process, if there is a small amount of packed grain to be dried, the set hot air temperature will be low, and the heating temperature due to the temperature difference between this low set hot air temperature and the outside air temperature will be small. If the temperature is low, the burner may misfire, and this is an attempt to prevent this and to improve combustion efficiency.

Means for Solving the Problems The present invention is capable of processing grains flowing down from an upper storage chamber l through a plurality of upper and lower drying chambers 2 at a lower portion using hot air generated from a hot air device 3 provided separately for each of the drying chambers 2. In a grain dryer that dries while suctioning and exhausting air using an exhaust fan 4 provided separately in each drying room 2, when the set hot air temperature of each hot air device 3 is within a predetermined temperature range with respect to the outside air temperature, hot air is removed. The drying control method is characterized in that drying is performed by reducing the number of operating hot air devices 3 that generate heat by a predetermined number.

Effects of the Invention The grains are repeatedly circulated through the upper storage chamber 1 and the lower drying chamber 2 in multiple stages, for example, three stages, and then flowed down. A set hot air temperature set depending on the amount of grains to be packed, etc. is generated, and this hot air is sucked and exhausted by the exhaust fan 4 installed separately in each of the three drying chambers 2. The grains passing through and flowing down in each of the three drying chambers 2 are exposed to this hot air and dried.

During this drying work, the heating temperature of this burner is calculated by comparing the set hot air temperature generated by the burner with the outside air temperature, and if the calculated heating temperature is within the set predetermined temperature range, The operation of the burners is controlled in a decreasing manner, for example, two out of three burners are activated and one is deactivated;
The set hot air temperature of the two burners operated so as not to reduce the drying rate of the grains is controlled to be higher than the set hot air temperature of the burners when three burners are operated, and the grains are dried.

Effects of the Invention According to this invention, when the heating temperature of the set hot air generated by the burner of the hot air device i3 is within the set temperature range and is small, the number of operating burners is controlled to decrease, and the set hot air temperature is reduced. By controlling the temperature to be higher than before, the heating temperature of this burner was increased, so this burner did not misfire, and the burner was combusted in a high temperature range, improving combustion efficiency.

Embodiment In addition, in National Interest, the mechanism 6 of the grain dryer 5 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, and the upper end of this mechanism 6 is equipped with a transfer gutter 7 with a transfer spiral inside. A ceiling plate 9 is provided, and a storage chamber 1 for storing grains is formed in the upper part of the mechanism 6 below the ceiling plate 9. Below the storage chamber 1, there are, for example, three upper and lower ventilation mesh plates. Upper drying chambers 2 formed between them are arranged side by side and communicated with each other, and below each of the upper drying cars 2, middle drying chambers 2 formed between ventilation mesh plates are arranged side by side and communicated with each other, Below each of the middle drying chambers 2, lower drying chambers 2 formed between ventilation mesh plates are arranged in parallel and communicated with each other, and at the bottom of each of the lower drying chambers 2 there is a feed-out valve 10 that allows the grains to be fed out and flowed down. A grain collection gutter 11 rotatably equipped with a transfer spiral is provided below each of the drying chambers 2 in the lower tier to communicate with each other, and between the inner sides of each of the three drying chambers 2 in the upper and lower tiers. Three ventilation chambers 12 are formed in the upper and lower layers, and a hot air temperature sensor 13 is provided in each ventilation chamber 12 to detect the hot air temperature in the ventilation chamber 12. Exhaust room in tiers■
This is a configuration in which 4 is formed.

The front mechanism 6 is provided with an operating device 15 for starting and stopping the dryer 5, and a burner case 17 containing a burner 16 is provided in front of each of the three drying chambers 2 in the upper and lower stages.
A hot air device 3 consisting of the above and the like is provided in three stages, upper and lower, and behind the mechanism 6 on the rear side, an exhaust duct chamber 18 is provided behind the drying chamber 2 in the three upper and lower stages.
are provided in upper and lower three stages, and on the rear side of each of the exhaust duct chambers 18 are installed exhaust fans 4 in upper and lower three stages and exhaust fan motors 19 that rotationally drive the respective exhaust air W&4. The three upper and lower tiers of the ventilation chambers 12 are configured to communicate with each other individually, and the upper and lower three tiers of the ventilation chambers 14 and the upper and lower three tiers of the exhaust fan 4
This is a configuration in which the three upper and lower stages of the exhaust passage chambers 18 are individually connected to each other, and a valve that rotationally drives each of the delivery valves 10 via a deceleration mechanism 20 is provided at the bottom of the mechanism 6 on the rear side. This configuration includes a motor 21.

A supply port for supplying the transferred grains to the storage chamber 1 is provided at the center in the longitudinal direction of the bottom plate of the transfer gutter 7, and a supply port is provided below the supply port for uniformly diffusing and returning the grains into the storage chamber 1. This configuration includes a diffuser panel 22 that provides

The elevator 23 is provided in the front part of the mechanism 6 on the front side, and a packet conveyor 24 belt is stretched inside, and a dispensing tube 25 is provided between the upper end and the starting end of the transfer gutter 7 for communication. , a supply gutter 26 is provided between the lower end and the terminal end of the grain collection gutter 11 to communicate with each other.

A grain hoist motor 27 provided on the upper part of the grain hoist 23 rotates the packet conveyor 24 belt, the transfer spiral in the transfer gutter 7, the spreading plate 22, etc. The configuration is such that the transfer spiral is rotationally driven via the packet conveyor 24 belt.

Further, in the vertically central portion of this grain raising machine 23, grains that fall while being conveyed to the upper part by the packet conveyor 24 are received.
A moisture sensor 28 is provided to detect the moisture content of the crushed grains at the same time as the grains are crushed under pressure, and each part of the moisture sensor 28 is driven to rotate by the rotation of an internal moisture motor 29.

The operating device 15 has a two-box shape, and the surface plate of the box has the following features:
A start switch 30 for starting the dryer 5, and a stop switch 3 for stopping the dryer 5 for each of loading, drying, and discharging operations.
1. Grain type setting setting 32 and setting amount setting 33. The temperature of the hot air generated from each burner 16 is set according to the operation position of the grain type and the amount of grain put in. A moisture setting lever 34 for setting the finishing target moisture of grains depending on the operating position, grain moisture detected by the moisture sensor 28, hot air temperature detected by each of the hot air temperature sensors 13, remaining drying time, etc. are alternately displayed. A display window 35, a monitor display, etc. are provided, and an outside temperature sensor 36 for detecting the outside air temperature is installed on the outside of the bottom plate, and the detection values detected by the sensors 13, 28, 36, etc. - An A-D converter 37 that performs D conversion, an input circuit 38 into which the converted value converted by this A-D converter 37 is input, each switch 30.31, and each setting switch 32, 33, and 34. Input circuit 39 to which operations are input. A drying control device 42 includes a CPtJ 40 that performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits 38 and 39, an output circuit 41 that receives various commands from the CPU 40, and outputs them. Each of the settings 32, 33, and 34 is of a rotary switch type, and a predetermined value, type, etc. are set according to the operating position.

The drying control by the drying control device 42 is performed as follows, and the operation of the moisture setting controller 34 is performed by the CPU.
40, the finishing target moisture of the grain is set by this input, and when the grain moisture detected by the moisture sensor 28 is input to this CPU 40, the detected grain moisture and the finishing target moisture are combined. When they are compared and it is detected that they are the same, the drying control device 42 automatically controls the dryer 5 to automatically stop the drying of the grains.

The combustion control by the drying control device 42 is performed as follows. When the operations of the grain type setting function 32 and the charging amount setting function 33 are inputted to the CPO 40, this input causes the burner to be controlled. The temperature of the hot air generated from the CPU 40 is selected and set from the memory value set and stored in the CPU 40. For example, when the grain type setting knob 32 is operated to the position of the paddy grains, Amount setting hunting 3
3 is operated to a position where the amount of loaded grain is 6000 kg, and when these operating positions are input, the set hot air temperature (c) is selected and set to 30°C for all three burners from the set memory value. It is.

This set hot air temperature (Tc) and the outside air temperature (TA) detected by the outside air temperature sensor 36 are input to the CPU 40 and compared, and the heating temperature (T, ) of the burner 16 is calculated, This calculated heating temperature (rt) and the CPU
40 and the stored heating temperature (TA') is compared, and the number of operating burners 6 is controlled based on the comparison result.

For example, if the set hot air temperature (Tel) is 30°C and the detected outside air temperature (TA) is 28°C, the heating temperature (TE) of the three burners 16 is calculated to be 2°C. , this calculated heating temperature (T, ri 2℃ and the set heating temperature (
T%)7℃ is compared, (T,) 2℃<(T,')
The comparison result for 7° is the calculated heating temperature (T,) 2°C is the set heating temperature (T,)
T,') is input to the CPU 40 that the temperature is within the range of 7°C, and this input causes the operation of the three burners 16 in operation to be stopped, and at the same time, this stop control is These two burners 16 continue to operate in conjunction with
The set hot air temperature (re) is selected and set as 38°C from the set memory value, and the grains are dried at this set hot air temperature (re) of 38°C, and the set hot air temperature (TC)
is 30°C, and the detected outside air temperature (TA) is 20°C, the heating temperature ('rt) of the three burners 16 is calculated to be 10°C, and this calculated heating temperature (Tt
) 10°C and the set heating temperature (T,') 7°C are compared,
(T,)10°C>(T,')7°C This comparison result is input to the CPU 40 as the calculated heating temperature (TE) 10°C is outside the range of the set heating temperature (T,')7°C, With this input, the set hot air temperature (Tc) of the three vanes 16 in operation is continuously controlled at 30° C., and the grains are dried.

The set hot air temperature (Tc) generated by each burner 16 is individually detected by each hot air temperature sensor 13, and
This is input to U40, and this set hot air temperature (Tc) and this detected outside air temperature (re') are compared.

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

By operating each setting switch 32, 33, 34 of the operating device 15 to a predetermined position and operating the start switch 30 that starts the drying operation, each part of the grain dryer 5 and each burner 16 of each hot air device 3 can be adjusted. The moisture sensor 28 and the like are started, and each burner 16 generates hot air at a set temperature. and each exhaust fan 4 via each exhaust duct room 18
As a result, the grains stored in the storage chamber 1 are exposed to this hot air and dried while flowing down from the storage chamber 1 into each drying chamber 2. The grains are fed out and flowed down from the grain collection gutter 11 through the supply gutter 26 into the grain hoisting machine 23 by a lower transfer spiral, conveyed to the upper part by the packet conveyor 24, and transferred via the dump tube 25. The water is supplied into the gutter 7, and is transferred from the transfer gutter 7 onto the diffusion plate 22 by the upper transfer spiral, and is evenly diffused and reduced into the storage chamber l by the diffusion plate 22, and is circulated and dried. When the sensor 28 detects the same grain moisture as the finishing target moisture set by operating the moisture setting switch 34, the drying control device 42 of the operating device 15 automatically controls and automatically stops the dryer 5. Drying of the grain is stopped.

During this drying work, the set hot air temperature (Tc) generated from each burner 16 selected and set according to the operating position of each setting switch 32, 33 and the outside air temperature (TA) detected by the outside air temperature sensor 36 are set. is compared to calculate the heating temperature (T) of this burner 16, and this calculated heating temperature (T) is calculated.
rz) and the set heating temperature (TE') that has been set and stored, and the calculated heating temperature (T7) is the set heating temperature (T,').
When it is detected that the number of burners 16 in operation is within the range of
The set hot air temperature of 6 is controlled to a predetermined high temperature, and the grains are dried at this high temperature, and when the calculated heating temperature (TE) is outside the range of the set heating temperature (TE'), the burner 16 is activated. The operation of all burners 6 is controlled to dry the grains without reducing the number of burners 6.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a flowchart, Fig. 3 is an overall side view of the grain dryer, and Fig. 4 is A of Fig. 3. -A sectional view, 5th
The figure is a rear view of a portion of the grain dryer, and FIG. 6 is a partially cutaway front view of a portion of the grain dryer. Explanation of symbols 1 Storage chamber 2 Drying room 3 Hot air device 4 Exhaust air photograph (Fig. 1 1), S Fig. 2

Claims (1)

[Claims] The grains flowing down from the upper storage chamber 1 through the multiple upper and lower drying chambers 2 at the lower part are passed through the hot air blower 4 which is generated from the hot air device 3 which is installed separately in each drying chamber 2. In a grain dryer that dries while suctioning and exhausting air, the hot air device 3 generates heat from the hot air when the set hot air temperature of each hot air device 3 is within a predetermined temperature range relative to the outside air temperature.
A drying control method characterized in that drying is performed by controlling the number of operating units to decrease by a predetermined number.