JPS602874A - Grain dryer grain moisture content measurement method - 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 This invention relates generally to grain driers, and more particularly to a method for measuring grain moisture content during grain drying.

In grain drying, there are generally four operating modes: loading the grain to be dried into a grain dryer, first exiting from the dryer, ventilation drying, and drying by combustion. Loading, discharging, and ventilation drying are performed by driving only the drive system of the dryer (elevator motor, noan motor, etc.).Drying by combustion (hereinafter simply "
Drying (referred to as "drying") is carried out by driving the combustion system (large-point heater, fuel supply pump, etc.) in addition to these. Of the four types of work mentioned above, the main one is, needless to say, drying work. In detail, this drying work is carried out, for example, by the following process. That is, first, a drying target temperature is set according to the type of grain to be dried, the amount of grain to be dried, and the condition at that time, etc., and the control device installed in the dryer takes in the actual temperature traces inside the dryer at predetermined intervals. (TF3) and the target air temperature (TA), the target temperature (TC) is determined by the outside air temperature (TA).
), and a comparison is made between the corrected target temperature (TC) and the actual temperature (TB). On the other hand, the automatic moisture meter installed in this dryer measures the moisture content of the grains during the drying process and sends the measurement results one after another as moisture value information to the control device, which then calculates the average value of the moisture value information. 7'
Compare with the target water level C) 111'i.

1ill l deviceFl l, k e4i)napuI
It controls the combustion system, including the parts combustion system, and the drive system. Generally, the above target moisture content is 11'i'+], and the initial moisture value is about 22 to 28% for rice grains that have been dried (for example, 14.!i. It takes quite a long time to dry the dryer to the target duty of 1 shift.During such drying work, which takes about 1 hour, the dryer's 11- Foreign matter got into the tally valve, and in order to remove it by 1), the dryer was suddenly stopped.
, or when the drive of the dryer is stopped due to the time limit operation of the timer (, (, conventional example C).
When the q-wave drive is stopped, the data stored in the memory in the control device immediately before the q-wave drive is also erased. In this case, for example, >1 t+++ Moisture Drying grains of 2296 candies at an average drying rate of 1% and a target moisture content of 1 [1'114.5%]
Although it will take a while, if the dryer is stopped for 18γ after the start of the drying process and the data just before the stop is erased, the remaining dry average moisture content 11fi+ can be reset to the initial value. Experience has shown that the difference between the actual water content at the end of the additional drying period is almost eliminated (11N-known'C).
colour. However, in this case, the remaining drying time is 1
If you only have about 5 hours, you can compare the average moisture value at the start of additional drying with the actual grain value. There was a problem in that the error between the water content and the water content could not be resolved, resulting in over-drying of the grains.

This invention solves the above-mentioned problems of the prior art; The purpose of the present invention is to provide a method for measuring grain moisture content in a dryer.

1 - The feature of this invention for achieving the purpose of development is that the moisture content measured at the start of drying of the grains that are circulated and dried in a dryer is measured in multiple stages from the initial value until the target moisture content is reached. The moisture content based on the measurements after the step is calculated based on the moisture content measured in the previous step. When restarting after the drying rate reaches the target moisture content, the moisture content is reduced to 1!
? There is a method for measuring grain moisture content in a grain dryer.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a 10-step diagram of an apparatus according to an embodiment of the method of the present invention, and FIG. 2 shows the structure of FIG.
.

In FIG. 1, reference number 1 indicates the arithmetic control section of the microcomputer 7, including a memory (not shown), input ports 1 to 1 corresponding to respective inputs and outputs, and output ports (all not shown). has. The input information given to the calculation control unit 1 includes the drying time of the grain to be dried as described above. Timer input information from timer 2 which has a time limit stop 11 function to regulate the drying time, grain seed drying of the grain to be dried, and grain seed drying information 5 given from the drying temperature switching knob that changes the set temperature [σ] depending on the weather conditions. , Set the target moisture content Set moisture value information given from the target moisture content knob 6, Interrupt the hot air temperature display during drying work, and set it instead of the hot air temperature) From the setting stagnation call switch Setting temperature information that can be changed 7, Drying operation information that is valid only when the timer is set and is given from the ignition switch entering the ignition process 8, Stopping the drive system and/or combustion system of the grain dryer as described above. various operation information provided from the operation section such as stop operation information 3 provided from the stop switch 3, and an overheating detection sensor (not shown) that detects abnormal heating of the burner l (both not shown).
Overheat detection sensor information 9 provided from thermostats 1 to 1), and paddy flow sensor information 1 provided from a paddy flow sensor that detects the movement status of paddy within the grain circulation system (not shown).
0. Wind pressure sensor information given from a wind pressure sensor that detects outside air ventilation pressure during drying work and ventilation drying work 11. This heat fR humidity temperature is detected in order to adjust the hot air temperature according to the comparison between the hot air temperature and the set temperature. The hot air temperature sensor information 12 provided from the hot air temperature sensor and the sensor information h (provided from various safety sensor groups) are included. ml + constant moisture moisture value information given from a measuring means, i.e., an automatic moisture meter, to measure the moisture content of Measured moisture value information 4 is obtained by extracting a measurement sample from the dried grains circulating in the grain circulation system of the grain dryer during the drying operation, and crushing this measurement sample with the two electrodes of the automatic moisture meter. The resistance value between the measurement electrodes is converted into a DC voltage and is provided to the calculation control section 1 from the automatic moisture meter.

The arithmetic control section 1 takes in the measured moisture value information 4 given from the automatic moisture meter at predetermined intervals, performs arithmetic processing, and then stores it in a memory (not shown). Note that the moisture value in the memory (not shown) is updated at the predetermined time intervals. The moisture value data in this memory will not be erased when the dryer is stopped by the timer or the dryer is stopped by operating the stop switch, and will be retained until the dryer's power supply and therefore the microcomputer's drive power is turned off. be done. When the arithmetic control unit 1 recognizes that a timed stop signal has been given from the timer, it sends a moisture measurement stop signal to the automatic moisture meter and also gives a command to the drive circuit 14 to stop the drive system and combustion system 15. Further, the calculation control section 1 takes out the average moisture value stored in a memory (not shown) and the set moisture value, performs a comparison operation, and determines the end of drying. The calculation control unit 1 has grain type information 5, set temperature information 7, and outside air temperature sensor information 13.
The set temperature (drying target temperature) is calculated by The calculation control unit 1 alternately takes in hot air temperature sensor information (actual temperature inside the dryer) 12 and outside air temperature sensor information (outside air temperature) 13 at predetermined time intervals (for example, 10 seconds), and calculates the target temperature corrected by the outside air temperature and the drying temperature. Burner combustion is controlled by comparing with the actual temperature inside the dryer.The display output of the arithmetic control unit 1 is given to the display device 18, and the display device 18 displays the actual temperature inside the dryer or the current grain moisture value, etc. based on this. The arithmetic control unit 1 outputs an on/off command signal to control the dryer drive system, the ignition heater, the combustion system 15 such as the fuel supply pump, etc.
control. Further, the arithmetic control unit 1 supplies fuel control information to the valve drive circuit 16 according to the comparison between the actual temperature and the target humidity, drives the valve drive circuit 16, and operates the fuel supply electromagnetic valve 1.
7 opening/closing control is performed. Reference number 19 is a driving power source for the microcomputer, and 20 is a power switch.

A measurement method using the above-mentioned configuration will be explained using the flowchart shown in FIG. 2.

In order for the arithmetic and control unit 1 to carry out a predetermined control operation according to the flow illustrated in FIG. 2, it is first necessary to load the grain f to be dried into the grain dryer. Therefore, when starting the work, the arithmetic control section 1 starts the control operation from step 3G.

When the arithmetic control unit 1 confirms that information regarding the tensioning switch operation 1°C has been given (step 3G), a flag flip-flop is set that is reset when the drive system of the dryer is driven and is reset when the drive system is stopped. (not shown) is set (step 38).

Next, the arithmetic control section 1 performs the staking operation by driving the drive system 15 such as the elevator motor and the upper spiral (none of which are shown) via a digital output circuit (not shown). The arithmetic control unit 1 checks whether operation information regarding stop stitching has been given (step 40), and when it determines that the above information has been given, resets the flag flip-flop (step 41) and outputs a digital output (not shown). The driving of the drive system 15 such as the elevator motor and the upper spiral (none of which are shown) is stopped via the circuit (step 42). However, when the arithmetic and control unit 1 determines in step 40 that the operation information regarding the stop switch has been given, the stakeout work is still continuing, so the operations from step 31 to step 3G to step 40 are repeated. I yelled. After the tensioning work is completed in step 42, the arithmetic and control unit 1 checks whether the drying operation information 8 has been given in step 3.
4) If it is determined that the operation and information have been given, the process moves to step 43. The arithmetic control unit 1 checks whether the drying time has been set to the limit by the timer (step 43). Next, in the drying operation, a constant (C) related to the drying time is set as a rule of thumb depending on the type of grain to be dried, the amount of mulch, etc., so the operator selects this constant (C) related to the drying time and starts the timer counter. The content of is set to (C) (step 43').

When the arithmetic control unit 1 confirms that the content of the timer counter is set to a predetermined time C (C: a positive integer) in step 43', it sends a drive command signal to the drive circuit 14 via a digital output circuit (not shown). Then, the drive system 15 is driven (step 44), and the fuel supply pump of the combustion system 15 is driven (step 45). Since the drying operation information 8 is given in step 34, the arithmetic control unit 1 operates a flag flip-flop (hereinafter referred to as "flag A"), not shown, which is set when the combustion system of the dryer is driven and reset when it is not driven. '') is set (step 4G), and if it is reset, a drive command for the heater in the combustion system 15 is sent to the drive circuit 14 via a digital output circuit (not shown) (step 47). ). Further, when the arithmetic control unit 1 determines that the flag A is set in step 46, the process proceeds to the next step 48. This is because if flag A is set in step 46, this indicates that the drying work is already in progress and the heater is also being driven, so there is no need to turn on the heater again.

Next, as mentioned above, the calculation control unit 1 takes in the measured moisture value information 4 given from the automatic moisture meter at predetermined intervals (
Step 48), arithmetic processing is performed and the data is stored in a memory (not shown) (Step 49). The calculation control unit 1 performs step 49
The arithmetic processing carried out in is to calculate the average value of the measured moisture values taken at predetermined time intervals. This average moisture value calculation is performed using the following formula. +-x=a+
-x+ (1-a)M.

1-X: average moisture value, a: constant 1M: measured moisture value. After calculating the average moisture value 1-x in step 49, the arithmetic control unit 1 retrieves 1-x from a memory (not shown),
It is output to the display device 18 (step 50). The arithmetic and control unit sets flag 8 to 1 to 1 since the combustion system for the drying 1st generation is in the operating state (step 51). The arithmetic control unit 1 checks whether operation information for the stop switch to stop the drying operation has been given (step 52), and if it is determined that the operation information has not been given, then the operation control unit 1 checks the heat Ffa given from the hot air temperature sensor. ? The m degree sensor information is taken in and stored in a memory (not shown) (state 31). Next, the arithmetic control unit 1 extracts the above information from a memory (not shown) and outputs it to the display device V"118 (step 32). When the arithmetic control unit 1 confirms that flag A is set, (
Step 33) Check whether the timer has not been reset. If not, step 43 to step 52 and step 33
After that, the operation up to step 43 is repeated again.

When the arithmetic control unit 1 recognizes that the operation information of the stop switch has been given in step 52, it resets the flag A (step 53), and sends the drive circuit 14, including the fuel supply pump, via a digital output circuit (not shown). Sends a signal to stop driving the combustion system 15 (step 54
). Next, the arithmetic control unit 1 determines whether a predetermined time (5 minutes) has passed since the combustion system 15 stopped driving by fKf.
(Step 55). The calculation control unit 1 performs step 5
The above operation is repeated until it is recognized in step 5 that the predetermined time has elapsed.

When the calculation control unit 1 confirms that the predetermined time (5 minutes) has elapsed in step 55, it sends a drive stop signal for the elevator motor drive system 15 to the drive circuit 14 via a digital output circuit (not shown) (step 56). . The user decided to wait a predetermined time interval (5 minutes) after stopping the driving of the combustion system 15 in step 54 and stopping the driving of the drive meter 15 in step 56 during the drying operation. This is because the drive system 15 is driven for a certain period of time to cool down the burner and then the operation is stopped in order to ensure safety.

The calculation control unit 1 takes in the hot air temperature sensor information provided from the hot air temperature sensor f's + and stores it in a memory (not shown) (step 31). Next, the arithmetic control section 1 takes out the above information from a memory (not shown) and outputs it to the display device 18 (step 32). Since the flag A has been reset in step 53, the arithmetic control section 1 confirms this by step 33) and proceeds to the next step 34.

Since the drying operation stop switch has been operated in step 52, the calculation control unit 1 moves to the next step 35 unless the drying operation information 8 is given again (step 34).
). Since the flag B is reset unless new operation information regarding the drive system 15 of the dryer is given, the arithmetic control unit 1 resets the flag B (step 35) and newly operates the tensioning switch ( The operations from step 31 to step 37 are repeated as long as the discharge switch information (step 36) and discharge switch operation information (step 37) are not provided.

When the arithmetic and control section 1 recognizes that the count contents of the timer have been reset in step 43 without receiving the operation information of the drying work stop switch in step 52, the process proceeds to step 57. The arithmetic control unit 1 holds the flag A set (step 5) because the drying operation has been stopped due to a time limit set by a timer (step 5).
7). Next, the arithmetic control unit 1 supplies a combustion engine 1 such as a fuel supply pump to the drive circuit 14 via a digital cycle output circuit (not shown).
A drive stop signal of No. 5 is sent (step 58). The arithmetic control unit decrements the count contents of the timer counter (Step 59), and checks whether the contents of the timer counter have been reset (Step Go).
). If the arithmetic control section 1 determines in step 60 that the simple count contents have not been reset, it returns to step 31 and repeats the operations from step 33, step 43, step 52 to step 33. If the arithmetic control unit 1 determines in step 60 that the contents of the timer counter have been reset, it resets flag 8 (steps 1 to 61) and instructs the drive circuit 14 to stop the drive system 15 via a digital output circuit (not shown). A command signal is sent (step 62). Since the flag Δ was reset to 1 in step 61, the arithmetic control unit 1 performs the operations from step 31 to step 37 unless operational information regarding the drying drive system and/or combustion system is given again. It will be repeated.

As explained above, according to the present invention, even if one dryer temporarily stops before the moisture content of the grains to be dried reaches the target moisture content, additional drying is performed based on the average moisture value immediately before stopping. Since we decided to carry out multiple steps of measurement from the initial value to the target moisture content, the moisture content based on the measurement at each step is an approximate calculation based on the moisture content based on the measurement at the previous step. The same result as when performing the method 1
This prevents over-drying, cracking of the shell, etc. and under-drying, and also contributes to saving on fuel costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus according to an embodiment of the method of the present invention, and FIG. 2 is a flowchart of the configuration of FIG. 1. 1... Arithmetic 1lIII group 2... Timer 3...
Stop switch 4... Automatic moisture meter patent Applicant Iseki No. 1 Iku Co., Ltd. 31-

Claims (1)

[Claims] The moisture content measured at the beginning of drying of the grains that are circulated and dried in the dryer is set as the initial value and measurements are carried out in multiple stages until the target moisture content is reached. In the grain moisture content measurement method of a dryer, in which the moisture content of grains is calculated continuously based on the approximate calculation based on the moisture content based on the target moisture content, When restarting after the dry air is temporarily suspended,
The moisture content of grains per 1 q of grain drying is 1 q of grain drying [standard method].