JPS61114078A - Cereal grain drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a grain dryer configured to blow hot air from a burner onto grains such as paddy or wheat to dry them to a target grain moisture content.

(Prior Art) In such a grain dryer, if the supply of hot air from the burner is stopped during the drying operation, the grains are subjected to a refining action and quality can be improved.

(Problems to be Solved by the Invention) However, in the case where the hot air supply from the burner is simply stopped as described above, the drying operation becomes longer by the time the hot air drying is stopped.

(Means for Solving the Problems) The present invention aims to solve these technical problems, and has taken the following technical measures.

That is, in a grain dryer configured to dry grains by exposing them to hot air from the burner (1), during this drying operation,
The burner (1) is extinguished when the grain moisture content reaches a preset value, and the burner (1) is re-ignited after a predetermined period of time. Configure higher than temperature.

(Operation) The grains are dried with relatively high-temperature hot air until a preset grain moisture content is reached. When that moisture level is reached, hot air supply to the grains is stopped for a predetermined period of time.

Thereafter, the burner (1) is reignited to once again expose the grains to hot air, but the temperature of the hot air is lower than the temperature before extinguishing.

(Effects) At the beginning of the drying process, the drying speed of the grains can be increased, so even if the drying process is stopped at the drying speed, the drying process does not take a long time.

Therefore, while it is possible to obtain a predetermined drying efficiency, it is possible to suspend the drying operation, so that it is possible to save fuel and improve the quality of grains.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings.

First, to explain its structure, a storage chamber (3) is provided in the upper part of the dryer (2), and a pair of left and right drying chambers (4) which are elongated in the front and rear are communicated with each other in the lower part. In addition, at the lower end of each drying chamber (4), there is installed a dispensing pulp (5) that is driven to rotate at a constant low speed, so that the grains in the drying chamber (4) are sent little by little to the collection chamber (6) at the bottom. It is about to be sent out. The left and right side walls of both drying chambers (4) are each made of a mesh or a perforated plate, so that the drying chamber (4) can be ventilated from side to side. In addition, the hollow chamber formed between the left and right drying chambers (4) is configured as a hot air chamber, and the burner (
1) and a fan (7) to uniformly dry the grains. Also, the collection room (6)
A screw conveyor (8) is installed at the bottom of the machine, facing forward and backward, and the grains that have undergone the drying process are once transferred to the rear, and then lifted and transferred upward by the grain lifting device (9). It is configured such that it is sent to the upper center of the storage chamber (3) by a transport conveyor α1, and then diffused and discharged via a diffuser α■.

A burner box (2) stores the burner (1).
), on the outer wall of the machine, there is a group of operation switches such as the drive system switch (drying bush button switch) (13) and stop switch (b) of the dryer (2), and the control operation depending on the type of grain such as paddy or wheat. A control box α equipped with a selectable grain type rotary switch CS*t is installed.In addition, the control box
A moisture detector αη is provided at a lateral position to detect moisture in grains subjected to drying action.
The moisture data detected by η is processed by the arithmetic and control unit (hereinafter referred to as CPU) in the control box αQ, and then displayed on the display unit α of the control box αQ.
displayed digitally.

Next, to explain the block circuit in Fig. 3, C
PU (to) is a memory (not shown) that stores necessary data such as control programs and drying curves corresponding to initial moisture values, and input port 翰■υ and output port Iwa@ corresponding to input and output.
(c) is provided to perform arithmetic logic and comparison calculation processing.

Then, the digital input circuit (c) and the A/
Output information from D conversion circuit (a) is incorrect, CPUQl1
The drive command signal output from 9 is output to the digital output circuit (5) via the output port (A), and is also output to the drive circuit (C) via the output port (C). The information input to this digital input circuit (c) includes the operation information output from the operation switch handle consisting of the switch α1αΦ, and the safety sensors (7 ), the grain amount information output from the grain amount rotary switch 0η, which sets the amount of grain to be dried (manual or automatic), and the grain type rotary switch, which selects the grain type. There is grain type information etc. output from the switch (G). In addition, as information input to the A/D conversion circuit (e), outside air temperature information outputted from the outside air temperature sensor (to), hot air temperature information outputted from the hot air temperature sensor (2), and the moisture detection There is grain moisture information output from the container αη.

Next, from the digital output circuit (5), the electromagnetic pump (
b), the ignition heater (to), the suction fan motor (to) that drives the suction fan (7), and the grain frying device i! (9) T-driven elevator motor (b) and rotary pulp (8)
A drive command signal is output to the rotary pulp motor (to) that drives the rotary pulp motor. Further, a drive command signal is output from the drive circuit (c) to the electromagnetic pulp for fuel (g). moreover,
from the output port) to the display section a via the amplifier circuit θ.
A drive command signal is output to 1.

cpu (1) has the functions described below. ■ The hot air temperature (T
A: Output the drive command signal as much as possible (T+s+k). ■When the detected moisture value reaches the resting moisture value stored in memory in advance, the combustion system is stopped, and after a few minutes,
The drive system of the dryer (2) and the wind fan motor are stopped. ■After the burner (1) has stopped (this may be the drive system of the dryer or the fan motor, etc., but is not limited to this), several hours later, the drive system and combustion system of the dryer (2) are switched to the fourth burner. Outputs a drive command signal according to the sequence shown in the figure. ■
After relighting the burner (1), the hot air temperature (TA
) minus several degrees (β) from the hot air temperature (Ta = TA−β
, However, a drive command signal is output as much as possible to o<p<ri>>.

Next, the control action of the above configuration will be explained.

First, the operator sets the grain amount rotary switch 01) to the scale corresponding to the amount of grain loaded into the machine! Then, set the grain type rotary switch α frame to the paddy side. Then, these grain amount information, grain type information, and outside temperature information from the outside temperature sensor (to) are input to the digital input circuit (
The temperature of the hot air (
T1+) is calculated.

Next, the operator sets the target finishing moisture value using the setting moisture switch (6), and then turns the drying bush ° button switch (13t-r○N).This operation information is then transferred to the digital input circuit. (c) - Since it is input to the CPU (to) via the input port (1), the CP UQl19
is the output capo, -to (to), through the digital output circuit @,
Sequentially send drive command signals to the electromagnetic pump (b), ignition heater (to), burner (1) carburetor motor (not shown), suction fan motor (to), elevator motor (b), and pulp motor (to). output and drive each. After a few minutes, the output port (c) and drive circuit (2) are connected to the CPUQJli.
) through the hot air temperature (Tu) and the hot air temperature ('l
) is output to the fuel electromagnetic valve (to), so that the fuel supplied through this pulp to the carburetor (not shown)!
1, and mixed with primary combustion air supplied from an air conditioning fan (not shown) controlled to have a predetermined rotation speed based on the opening time of the electromagnetic pulp drive signal. The mixed gas is ignited by the ignition heater and combusted. Then, the outside air sucked into the burner box (2) by the suction fan (7) by this combustion flame is heated and turned into hot air, which is sent into the hot air chamber to dry the shredded grains. During this drying work, the moisture data of the grains detected by the moisture detector α at predetermined intervals is
D conversion circuit (to)/input capo) CPU via ett
(to) is taken in and subjected to arithmetic processing, and then digitally displayed on the display section α0 from the output port () through the amplification circuit Oυ.

In such drying work, if the grain moisture detection data becomes less than the preset grain moisture value (resting moisture value) (B), the drive stop command signal of the CPU (To) is sent to the output port (C).・Through the digital output circuit (A), the output is output to the electromagnetic pump (B), the carburetor motor (not shown), and the elevator motor (To) to stop the drive, and the output port ■・Drive circuit (C) The electromagnetic valve (to) K is outputted through the solenoid valve (to) to stop the drive. After a few minutes, the output port
After the drive of the fan motor (7) is stopped via the digital output circuit @, this rest state is maintained for several hours. Then, when a predetermined period of time has elapsed (Fig. 5C), a drive command signal is output from the CPU (to) according to the sequence of the time chart shown in Fig. 4 to drive each rotating part of the dryer (2). Perform the drying process again. The drying curve after the re-drying operation (shown by the solid line in Figure 4) is approximately the same as the drying curve (shown by the broken line in Figure 5) predetermined by the drying initial moisture value (8) of the grain. Continue drying until the target moisture value is reached.

Therefore, if the initial moisture value (A) is larger than the resting moisture value (5), the hot air temperature (TA) until reaching this resting moisture value (5)? : Since the drying operation is performed at a temperature several degrees higher, the drying operation time at the initial stage of drying, that is, up to the resting moisture value (B) can be shortened. Further, after re-drying, the drying is performed at a hot air temperature (T, , ) lower than the hot air temperature (TA) at the initial stage of drying, so that the quality of the grains to be dried does not deteriorate.

In addition, in the initial stage of drying, if the initial moisture content is lower than the resting moisture value, the drying operation is performed at the standard hot air temperature (T, . . . ) instead of the increased hot air temperature (TA).

To explain Fig. 6, the grain amount rotary switch 0
The grain amount information set with η and the grain type information set with the grain type rotary switch αυ are input to the digital input circuit (
The data is taken into the CPU (g) via c) and subjected to comparison calculation processing. Then, a drive command signal corresponding to this information is output from the CPU (to) to the pole number switcher (to) via the digital output circuit (to), and controls the rotation speed of the fan motor (to) (for example, As shown in Fig. 7, if the amount of rice to be put in is large for ordinary paddy, the height is increased to increase the air volume.

Therefore, even if conditions such as the amount and type of grain differ, the drying operation can be carried out with a favorable drying air volume, making it possible to obtain dried grains of good quality.

Although the number of poles of the motor was changed in order to control the air volume of the suction fan (7), the present invention is not limited to this. The number of poles of the motor may also be changed by changing the diameter of the wind control valve.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a front view of the grain dryer, Fig. 2 is a partially cutaway side view, Fig. 3 is a block circuit diagram, and Fig. 4 is a FIG. 5 is a diagram showing a drying curve, FIG. 6 is a block circuit diagram for controlling the number of rotations of the fan, and FIG. 7 is a diagram showing the relationship between the loading amount, grain type, and fan. (1) indicates a burner.

Claims (1)

[Claims] In a grain dryer configured to dry grain by blowing hot air from a burner (1) onto the grain, when the grain moisture reaches a preset value during this drying operation, the burner (1) is extinguished and after a predetermined period of time, A grain dryer configured to relight a burner (1), and in which the hot air temperature of the burner (1) before extinguishing is higher than the hot air temperature after relighting.