JPH01217184A - Grain drying control method of grain dryer - Google Patents

Abstract

PURPOSE:To obtain good dry grains even if a mixing quantity of polished rice and millet of high moisture is large by estimating the moisture shifting quantity of the grains after the completion of drying and controlling to stop the drying according to the estimating moisture shifting quantity on the basis of the different quantity of the moisture of only polished rice, the whole grain moisture and the mixing ratio of the polished rice and millet. CONSTITUTION:A moisture sensor 22 is formed like a box, grains fed from a grain flowing conduit 23 is delivered into a spiral channel 25 of a rotating carrying roll 24 one by one, sandwiched by pressure and pulverized by the outer circumferential surface of detecting rolls 1, 1 and grain moisture is detected by the wave height and wave width of voltage waves of the grains. Since the maximum value of the wave height and wave width value are different in polished grains, polished rice and millet, mixing ratio is operated respectively, whereby the moisture shifting quantity of the grains after the completion of drying is estimated and a drier is automatically stopped to stop drying of the grains when an operation average moisture value of only polished grains becomes a grain moisture value at which the moisture shifting quantity is contained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a grain drying control system for a 1g 2 grain dryer.

Conventional technology Conventionally, a certain number of drying grains are crushed one by one between a pair of rotationally driven detection rolls and crushed under pressure, and at the same time, the waveform height of the voltage waveform of the crushed grains is measured. Grain moisture was detected based on the value, and when the detected grain moisture became equal to the set finishing target moisture, the grain dryer was automatically stopped and drying of the grains was stopped.

Problems to be Solved by the Invention At the same time, a predetermined number of drying grains are transferred one by one between a pair of rotationally driven detection rolls and crushed under pressure, and at the same time, the voltage waveform of the crushed grains is The highest value of height is detected,
This detected maximum value is replaced with grain moisture, and when this detected grain moisture becomes equal to the set finishing target moisture, the grain dryer is automatically stopped and the drying of the grain is stopped.

If a large amount of green rice or grains are mixed into the grain during drying, these grains often have a high moisture content compared to fine grains, and this high If a large amount of moisture is detected in green rice or rice bran, the moisture content of the grain will be high, and for this reason, the fine grains may be overdried by the time drying is completed, and this causes the body side of the fine grains to be too dry. If drying occurs or is left unattended after drying, the high moisture content of green rice or rice grains may transfer to the fine grains, resulting in the moisture content of the fine grains becoming higher than the target moisture content. Therefore, the grains sometimes had to be re-dried before being hulled, which sometimes required extra man-hours.

Means for Solving the Problems This invention crushes grains under pressure while rotating them, and determines the fine grains, blue color, etc. in the grains by the waveform height and waveform width of the voltage waveform of the crushed grains. In a grain dryer equipped with a pair of detection rolls (1), (1) for detecting the moisture content of rice, gruel, etc., the moisture content of the grains detected by the detection rolls (1), (1) can be detected by the eight grains. In addition to carrying out both the moisture detection of the grains and the moisture detection of the fine grains including the green rice and the rice cake, etc.
The mixing ratio of these green rice and rice grains is calculated, and the amount of moisture transferred to the dried grains after drying is estimated based on the calculated mixing ratio of green rice and the detected moisture of both, and based on this estimated amount of moisture transfer. The grain drying control system is configured to perform drying control.

Operation of the invention Between a pair of rotationally driven detection rolls (l゛), (1),
At the same time as some of the grains being dried are compressed and crushed one by one by a predetermined number of grains, the highest value of the waveform height and the waveform width value of the voltage waveform of the crushed grains are detected, and based on these detected values, ,
For example, if the maximum value of the waveform is below a predetermined value and the waveform width value is within a predetermined range, it is determined that the moisture value of fine grains has been detected, and the maximum value of the waveform is above a predetermined value and the waveform width value is within a predetermined range. If it is within the range, it is determined that moisture in the green rice has been detected, and if the maximum value of the waveform is below or above the predetermined value and the waveform width value is narrower than the predetermined range, it is determined that moisture has been detected. Even if the maximum value of the waveform is below a predetermined value, if the waveform width value is wider than the predetermined range, the detected moisture value is cut off, assuming that the grain was measured at the time between two grains.

The average value of a predetermined number of grains of only the detected fine grains is calculated, and the calculated average moisture value of only the fine grains obtained by this calculation,
The average value of the detected predetermined number of grains such as fine grains, green rice, and grains is calculated, and the calculated average moisture value of all the grains obtained by this calculation is alternately displayed on the dryer. From the number of detections of green rice and rice bran within these predetermined grain numbers,
The mixing ratio of green rice and rice grains is calculated.

The calculated average moisture value of only the grains obtained above is compared with the calculated average moisture value of all grains, and after drying is completed based on the amount of difference in this comparison result and the mixing ratio of green rice and rice bran obtained above. The moisture transfer amount of the grains is estimated, and when the calculated average moisture value of only the fine grains reaches the grain moisture value that takes this moisture transfer amount into consideration, the dryer is automatically stopped and the drying of the grains is stopped. Ru.

Effects of the Invention With this invention, it is possible to detect the moisture content of only fine grains and the moisture content of all grains including green rice and rice bran, etc., and also calculate the incorporation ratio of these green rice and rice grains. Depending on the difference between the moisture content of grains and the moisture content of all grains, and the mixing ratio of green rice and rice bran,
By estimating the moisture transfer amount of the grain after grain drying is completed, and controlling the drying of the grain to stop while taking this estimated moisture transfer amount into consideration, high moisture content in the grain being dried is prevented. Even when grains contain a large amount of green rice or rice grains, the moisture content and amount of grains are detected during drying, and drying is controlled based on these detected values. There is no need for over-drying of the fine grains, which causes shell side formation, and there is no need to re-dry the grains, which makes it possible to obtain good dried grains and improve drying efficiency.

Example In addition, when rotating, the model (3) of the dryer (2) has a rectangular shape that is long in the front and back direction, and is composed of front and rear wall plates and left and right wall plates, and this dryer (2) is installed on the front wall plate. A burner case (6) containing an operating device (4) for starting and stopping operations and a burner (5) is provided, and the burner case (6) has a fuel valve and a fuel valve for supplying fuel to the burner (5). The structure includes a pump (7), a blower (31) and a motor (32) for supplying combustion air, and an exhaust fan (33) and a motor (34) on the rear wall plate. It is the composition.

Inside the model (3), a storage chamber (8) is formed in the upper part,
On the lower side of this storage chamber (8), a drying chamber (1G) in which a delivery valve (9) is rotatably supported on the lower part is arranged in parallel and communicated with the drying chamber (1G),
At the bottom of each drying chamber (10), there is provided a grain collecting trough (11) in which a transfer spiral is rotatably supported on the lower part to communicate with each other. ), and an exhaust chamber (13) is formed outside each of the drying chambers (lO), and the hot air generated from the burner (5) flows from the hot air chamber (12) to the drying chamber (10) and to the drying chamber (10). The exhaust fan (
33), and the hot air chamber (12)
A hot air temperature sensor (14) is installed inside the hot air chamber (12) to detect the hot air temperature inside the hot air chamber (12). It is configured to be rotationally driven by the motor (34).

In the upper part of the model (3), a ceiling plate (15) and a transfer gutter (16) equipped with a transfer spiral are provided above the storage chamber (8), and in the center of this transfer gutter (16), the transferred grains are A supply port is provided for supplying the liquid into the storage chamber (8), and a diffusion plate (17) is provided below the supply [1].

The elevating device (18) is provided in front of the front wall plate, and inside the packet conveyor (19) belt is stretched between the upper and lower pulleys, and the elevating device (18) is provided between the upper end and the starting end of the transfer gutter (16). A projecting tube (20) is provided to communicate with the lower end and the grain collection gutter (11).
) A supply gutter (21) is provided between the grain raising machine (18) and the terminal end thereof, and a motor (3
5) and a moisture sensor (22) for detecting grain moisture is installed in the vertically central part, and this motor (35) moves the packet conveyor (19) and the transfer spiral in the transfer gutter (16). It is configured to rotate and drive the spreading plate (17), etc., and the grains that fall while being conveyed to the upper part by the packet conveyor (18) are received by the flow grain gutter (23), and the grains are
3), the water is guided downward and supplied into the moisture sensor (22).

The moisture sensor (22) is formed into a box shape, and inside the box, the grains supplied from the flow grain trough (23) are fed into the spiral groove (25) of the rotating transfer roll (24). included,
A pair of detection rolls (1), (1
), and this detection roll (1),
(1) At the same time as the grains are compressed and crushed on the outer peripheral surface, the waveform height and waveform width of the voltage waveform of the crushed grains are detected, and the grain moisture is determined by these detected waveform heights and detected waveform widths. It is a configuration in which grain moisture is detected by replacing
The crushed grains for which moisture has been detected adhering to each of the detection rolls (1) are removed by each cleaning roll (27), and the remaining grains that have not been fed into the spiral groove (25) of the transfer roll (24) are removed by each cleaning roll (27). The grain leaks from the spiral groove (28) of the deep groove, and the leaked grain and the crushed grain whose moisture has been detected are guided down by the discharge gutter (29) into the raised grain a (1B). The moisture sensor (22) is connected to the motor by transmitting an electrical measurement signal from the operating device (4) at predetermined time intervals. (30) rotates, and each part is rotationally driven by the rotation of this motor (30).

The operating device (4) is configured to start and control the dryer (2) and adjust and control each part. for,
A tensioning start switch (3B), a drying start switch (37), a discharge start switch (38), a stop switch (3B) for starting the drying R (2) for each operation, and a stop switch (3B) for stopping the drying R (2).
9) Grain type (40) for setting the temperature of the hot air generated from the burner (5), Grain amount (41),
a moisture gap (42) for setting a target moisture content for grain finishing; an increase switch (43) for increasing and decreasing the drying time; a decrease switch (44); a detected hot air temperature detected by the hot air temperature sensor (14); A display window (
45) and a monitor display, etc., and these grain type machine (40), shaving machine (41), and moisture dispenser (42) are of rotary switch type. The temperature of the hot air generated from the burner (5) is set by the operating position of the burner (40) and the filling amount hole (41).
Further, the finishing target moisture content of the grains to be dried is set by the operating position of the moisture pocket (42), and a control device (4B) and a moisture control device (47) are provided inside the box body. The configuration is as follows.

The moisture control device (47) is a device that mainly controls the drying of grains, and includes an A-D converter (48) that converts the detection value detected by the moisture sensor (22) from A-D to A-D. An input circuit (49) into which the converted value converted by the D converter (48) is input, an input circuit (5G) into which the operation of the moisture meter (42) is input, and each of these input circuits (49).
, a CPU (51) that performs arithmetic and logical operations, comparison operations, etc. on various input values input from (50), and an output circuit (52) that receives and outputs various commands from this CPU (51). It is the composition.

The control device (413) mainly controls the dryer (2).
This is an A-D converter that performs A-D conversion of the detected value detected by the hot air temperature sensor (eye), and this A-D converter. an input circuit into which the converted value is input, the pasting start switch (3B), and the drying start switch (37).
, the discharge start switch (3B), the stop switch (39), the grain type amount machine (aO), the loading amount machine (41), the increase switch (43), and the decrease switch (44). The CPU (51) performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits;
This configuration includes an output circuit that receives and outputs various commands from the PU (51).

The operation of the moisture control device (42) is input to the moisture control device (47), and the control device (4B) controls the grain type control (40), the filling amount control device (41), and the drying start. When the operation of the switch (37) is input, each of the motors (30), (32), (34), and (35) rotates,
At the same time as each part of the dryer (2) is rotationally driven, the fuel pump (7) and the moisture sensor (22) are started, and the dryer (2) starts drying grains. 32 grains were measured four times during drying, and these four
The structure is such that the highest value of the voltage waveform of each of these 32 grains is taken as grain moisture and the average value is calculated, and from the calculated average value of these 4 times, the overall average value of these 4 times is further calculated. ,
This calculated overall average value is displayed on the display window (45) as the moisture content of all grains including fine grains, green rice, and grains. The highest value of the voltage waveform must be 1% higher than the overall average value, set and stored in the CPU (51).For example, if the overall average value is 22%, the voltage If the waveform width value of the waveform is within a predetermined range set and stored in the CPU (51), it is determined to be fine grains, and only the grains determined to be fine grains are averaged for each of the four times as described above. is calculated, and from the average value of the four calculations, the overall average value of the four calculations is further calculated as described above, and this calculation overall average value is displayed on the display window (45) as the moisture content of only the fine grains. be.

Green rice is determined when the highest value of the voltage waveform is at least 1% higher than the @ calculation overall average value set and memorized above. For example, if the calculation overall average value is 22% as described above, it is 23% or higher,
If the voltage waveform width value is within the predetermined range set and memorized above, it is determined to be green rice, and the highest value of the voltage waveform is determined to be green rice if the highest value of the voltage waveform is 1 from the overall calculated average value set and memorized above.
% higher or lower, for example, if the overall average value of the calculation is 22% as above, it is 23% or higher, or 23%.
% or less, and if the waveform width value of the voltage waveform is a value narrower than the predetermined range set and stored, it is determined to be a rice. Depending on the number of times old rice determined to be green rice is detected among these 32 grains, The mixing ratio of this green rice is calculated by the CPU (51), and based on the number of times of detection of rice grains determined to be grains among the 32 grains, the mixing ratio of this rice is calculated by the CPU (51) in the same way as the mixing ratio of green rice. The configuration is such that calculation is performed using (51).

The CPU calculates the calculated overall average value (M^) of all grains, the calculated overall average value (Ms) of fine grains only, and the mixed ratio of green rice (D^) detected by the moisture sensor (22) as described above.
Substituting into the following formula set and memorized in (51), the moisture transfer of the grain after the completion of grain drying rl (Me) 'tt
The CPU (51) is configured to perform a calculation.

MD = (MA - Ms) X D AThis CPU
The finishing target moisture set by operating the moisture twisting (42) in (51) is corrected by the moisture transfer amount (Me) obtained by calculation from the above calculation formula, and this corrected finishing target The calculated overall average value (Ms) of only the moisture content and fine grains is compared, and when they are the same, it is assumed that the drying of the grains has been completed.
The moisture control device (47) performs self-Rh control to automatically stop the dryer (2).

Also, during this drying, the detected hot air temperature detected by the hot air temperature sensor (14) and the set hot air temperature are compared, and if they are different, the number of times the fuel valve is opened and closed is changed so that the temperature becomes the same as the set hot air temperature. The amount of fuel sucked by the fuel pump (7) is controlled by the control device (4B).

By operating the grain type setting (40), filling amount setting (41) and moisture twisting (42) of the operating device 2t (4) to predetermined positions, and operating the drying start switch (37),
Dryer (2), moisture sensor (22) and burner (5)
is started, hot air is generated from this burner (5), this hot air is ventilated from the hot air chamber (12) to the drying chamber (10), passes through the exhaust chamber (13), and is sucked and exhausted by the exhaust fan (33). The grains stored in the storage chamber (8) are exposed to this hot air and dried while flowing down from the storage chamber (8) into the drying chamber (lO), and are then transported to the lower part by the delivery valve (9). The grains are fed out and flowed down to be supplied into the grain collecting gutter (11), and from this grain collecting gutter (11), via the feeding gutter (21), into the grain hoisting machine (18) by the lower transfer spiral, and then transported to the packet conveyor. (18), is transported to the upper part, is supplied into the transfer gutter (16) through the dispensing tube (20), and is diffused from this transfer gutter (1B)! (17) Transferred to the upper part by the 111g rotation, and this diffusion plate (17)
is evenly diffused and reduced into the storage chamber (8), circulated and dried, and the moisture sensor (22) detects the moisture only in the fine grains and the fine grains.
At the same time, the moisture content of all grains including green rice and grains is detected, and the mixing ratio of green rice is also detected, and the moisture content of only these fine grains is detected.
The amount of grain moisture transfer after grain drying was detected based on all the grain moisture and green rice mixing ratio, and the detected grain moisture transfer amount was set by operating the moisture twisting (42). If the finishing target moisture content is corrected and the corrected finishing target moisture content is the same as the moisture content of only the detected fine grains, the moisture control device (4B) of the operating device (4) automatically controls the drying process. Automatically stop machine (2).

By performing grain drying that takes into account moisture transfer after grain drying, an accurate finished target moisture content can be obtained.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side sectional view of a moisture sensor, Fig. 2 is a rear view of the moisture sensor,
Figure 3 is a block diagram, Figure 4 is a flow chart, and Figure 5 is a block diagram.
The figure is an overall side view of the dryer partially cut away, FIG. 6 is a sectional view taken along the line AA in FIG. 5, and FIG. 7 is an enlarged front view of a portion of the dryer. In the figure, code (1) indicates a detection roll.

Claims (1)

[Claims] A pair of devices that crush the grains under pressure while rotating and detect moisture in fine grains, green rice, rice cake, etc. in the grains based on the waveform height and waveform width of the voltage waveform of the crushed grains. In a grain dryer equipped with detection rolls (1), (1), the grain moisture detected by the detection rolls (1), (1) is detected only in the fine grains and transferred to the green rice. and moisture detection including the rice gruel, etc.
and the mixed ratio of rice bran, and the calculated mixed ratio of green rice and the detected moisture of both to estimate the amount of moisture transferred to the dried grains after completion of drying, and drying is controlled based on this estimated amount of moisture transferred. A grain drying control system featuring: