JPS5872873A - Control system of drying of circulation type cereal 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 The present invention relates to a drying control system for one or four circulating grain dryers.

Circulating grain dryers, which are generally widely used, set the hot air temperature empirically or based on a pre-prepared table using the grain type, sum, initial SEMI moisture content, and outside air temperature as parameters. I was doing it.

However, this method of setting the altitude is difficult.

Since the length of drying time was not considered, there was an inconvenience that the dry bendability until the target moisture content was reached varied greatly depending on the weather conditions during Operation 1. Moreover, in combination with setting the drying time for each day of operation, the accumulation of 46 outages increases, resulting in a reduction in the operating rate of the dryer and a drawback of lowering the drying efficiency. In other words, with this type of drying, even though there is enough time to adjust the drying time and dry at low temperatures, the initial setting of hot air is set high each time, resulting in For one trigram, the machine was drying with direct current while leaving some free power.

However, considering the quality of the grain, it is desirable to stretch it for as long as possible and dry it at a low temperature.

The purpose of this invention is to solve this kind of problem by making it possible to set the drying time to 1 hour in order to eliminate downtime, and thereby to set the MS l1Iil1fof degree as low as possible. The object of the present invention is to provide a drying control method in which the drying time to reach the target moisture content matches the set time regardless of changes in outside temperature, etc.

In accordance with the above object, the present invention provides a method for determining the maximum moisture content of grain at dryness), °, star), and predetermined time intervals, and in addition to the current moisture content and fresh air quality I1.
7', the hot air temperature is set stepwise using the remaining drying time (set drying time - elapsed time) as a parameter. Here, the outside air temperature may be omitted depending on the case.

The 11th line 1 shows a drying curve obtained by the JLILL FRLU method according to the present invention.

Time t. is the time at which drying starts, and point a at this time is obtained from the moisture meter as the initial jφ moisture content. Time t. Then, preset information such as grain type, amount, drying time To, target moisture content (generally around 15%), and outside temperature are also taken in. As long as there are no sudden changes in the outside temperature, etc., this information will help you reach the target moisture content at the end of the drying time To (t4). The optimal Ws if l can be set each time using a table that stores the relationships.

This kind of method that has been used conventionally is to set the standard moisture content (moisture content according to the progress of drying IWi output 1) at the start of drying.
is set, and the hot air temperature is controlled at 1u at predetermined time intervals so that it always matches the set value.
This invention controls the ripening period (temperature) at predetermined time intervals based on moisture content, humidity, etc. so that drying can be completed within a predetermined drying time (time that has been extended in the past). At the start, time t
The hot air temperature is set so that the moisture content reaches the maximum moisture content in step 4 and the drying process ends.

The hot air temperature set as described above at time to is corrected again at time [1] after a predetermined time T1 has elapsed. This modification is performed by re-searching the table using new parameters in which outside temperature, moisture content, and remaining drying time (set drying time - elapsed time) are modified among the above parameters. Then, drying is performed for the next predetermined time T2 at the corrected hot air temperature, and at time t)2, eJ and parameters are corrected by reading out from the table, and the G (wind height) is accordingly corrected.

In this way, the hot air temperature is adjusted several times to several times during the initially set eruption time ttt1To, and the target water content is obtained at time t4. Therefore, even if the weather changes during the process, the hot air temperature will be adjusted accordingly.] By extending the start time until the standard moisture content is reached, there will be play until the next start of operation, which previously occurred.
Since 17J is used as drying time, the result is 11'17T of hot air during drying.
>Wind 77iK enables low-temperature drying of 40'C, making it possible to significantly improve grain quality. According to this invention, the drying time can always be kept constant regardless of the weather conditions.

Note that in the above explanation, the time for correcting the drying temperature is fixed, but the time width may be narrowed according to the time elapsed jυ·1. This improves the precision of control and the precision of the end time.

Next, a description will be given of the control method according to the present invention and the grain dryer to which it is applied.

FIG. 2 is a block diagram of the dryer control circuit, and FIG. 3 is a flowchart showing the operating procedure of the dryer control circuit.

In FIG. 2, the control unit 1 includes a CPU 10, a battery-backed R Alv+ 111R0M12, a timer 13 for distributing the elapsed time from the start of drying, and 11014.15. RAMII is the target moisture content,
There is a parameter area that records each of the cereals, willows, filling amount, drying time, outside temperature, and moisture content, a hot air temperature calculation table, and a table that stores the time between each drying (4HX) (r+
The area is divided into 1 area and 2 areas. Each table is a −1,: −'−' , ゛ 1−゛−“
′-゛′ - Created in advance and stored in RAM.

The dryer main body 2 is equipped with a moisture meter 3, and if the outside temperature is required, a temperature sensor 4 is used to detect the outside temperature. The outputs of these sensor units are converted into digital quantities by A/D converters 5 and 6, and input to t+y via a multiplexer 7 to l1014. In addition, 1-] standard moisture content setting volume 80, one type of grain setting volume 81, and filling amount setting volume 82
The setting data from the input section 8, which has a drying time setting volume 83 arranged on the operation panel, is inputted via the A/D converter 9.
1015. Furthermore, based on the oil amount set by the control unit l, an electromagnetic pump control pulse is sent from l1014 to the drive circuit 20, and the drive circuit 20 drives the electromagnetic pump 21 according to this control pulse.

Next, the operating procedure of this control circuit will be explained.

FIG. 3 shows the drying control procedure.

Step no (hereinafter step ni is simply referred to as ni)
In ~n3, each parameter set in the input section 8, that is, the target moisture content, grain type, filling amount, and drying time is taken in. Further, at n5 and n6, the current outside temperature and the current moisture content are taken in from the sensor section. In steps n7 to n8, hot air temperature data to be set is read from the hot air calculation table each time with reference to these parameters. Here, the remaining drying time is always stored in a register (not shown) as the time obtained by subtracting the elapsed open time ascertained by the timer 13 from the drying time To set in n3.

Subsequently, electromagnetic pump drive control of 09 and below is performed.

First, in step n9, the time for the drying section is set. Since the time of the first drying section is T1 (see FIG. 1), i=1 is set. nlO is the amount of oil required to keep the thermal expansion temperature set in n8 constant, based on the set temperature and actual/ill temperature +
Calculated from the frequency of the electromagnetic pump calculated from y and ax. , and 1JIX!1lJi of the -44" pump is pumped until the standard water content of 1" is reached.

When the current drying section 1i-Il is completed, the process returns to nl4-n5 and the processing below n5, that is, the wind temperature setting in the drying section of Le is performed.In addition, the electric 11 minute pump is The pulse signal number is opened/closed based on the data of both wave numbers of the electromagnetic pump set in , and IR1 is set as it progresses from n18 to n15 in the final drying section.

From there onwards, the predetermined time elapsed jf7! Drying temperature 1 is performed while the drying temperature is adjusted to l4n.

The time required for the Koshirae until the start of the next 11 river operations, which previously occurred.
Since id is the drying time, the result is the heat development during drying. The temperature itself can be lowered, allowing the palm wind temperature to be as low as 40°C compared to conventional high-temperature drying (50°C to 60°C).
, ``power running] fi', and the quality of grain can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 shows the drying curve blinded by the control method according to the invention. FIG. 2 is a block diagram of a dryer control circuit to which the control method according to the present invention is applied, and FIG. 31X1 is a flowchart showing the operating procedure of one of the control circuits. ■...control unit, 13...timer, 3...moisture rate meter,
4...Temperature sensor, 8...Input section. Applicant: Hiroshi Tatsumoto, Attorney: Hisao Komori, Patent Attorney

Claims (2)

[Claims] (1) It has an input section for grain type, amount, target moisture content, drying time, and current moisture content, and a timer that stores the elapsed time. A drying control method for a circulating grain dryer in which hot air temperature is set from a table stored in advance using information and remaining drying time obtained by subtracting elapsed time from the drying time as parameters. (2) Copy the input section for grain type, amount, target moisture content, drying time, outside temperature, and current moisture content, and the timer that memorizes the elapsed time. Drying insertion method 1 for a circulating grain dryer in which the hot air temperature is set from a table stored in advance using information from the drying time and the remaining drying time obtained by subtracting the elapsed time from the drying time as parameters.