JPH054591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for measuring grain temperature in a grain drying device.

(Prior Art) Conventionally, a method of measuring grain temperature using a measuring device in a grain drying apparatus is well known.

(Problem to be solved by the invention) However, the method of directly measuring grain temperature with a measuring device differs depending on whether the grain is dense or thin, and when the grain is dense, the temperature is higher. However, if the density of the grain is low, it will appear low.
lack accuracy.

Therefore, in the present invention, this is determined from the difference between the hot air supply temperature and the hot air exhaust temperature.

According to this calculation method, the most efficient drying can be achieved by using constants in the formula.

(Means for Solving the Problem) Therefore, the present invention provides a downstream type drying chamber 9, a hot air supply chamber 10 that supplies hot air to the downstream type drying chamber 9,
Hot air exhaust chamber 1 from which air is discharged from the downstream drying chamber 9
1, in which the hot air supply chamber 10
A method of measuring grain temperature in a grain grain machine is to install a hot air temperature sensor a inside the hot air exhaust chamber and an exhaust air temperature sensor b inside the hot air exhaust chamber, and assume the grain temperature from the measured values of both sensors a and b. It is something.

(Example) An example of an apparatus capable of carrying out the method of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a grain collection section placed on a weighing scale 2, which has a pair of left and right inflow sections 3, 3, Rotary valves 4, 4 are provided below the inflow portions 3, 3, respectively, the lower sides of which are surrounded by a receiving gutter 5, and a spiral conveyor 6 is installed horizontally on the central upper surface of the receiving gutter 5.

7 is a drying section placed on the upper part of the grain collection section 1;
A pair of left and right downstream drying chambers 9, 9 are formed with lower discharge ports 8, 8 aligned above the inflow portions 3, 3.
A hot air supply chamber 10 is formed between the downstream drying chambers 9, 9, and hot air exhaust chambers 11, 11 are formed outside the downstream drying chambers 9,9.

A hot air temperature sensor a is provided in the hot air supply chamber 10, and an exhaust air temperature sensor b is provided in the hot air exhaust chamber 11.
will be established.

The hot air temperature A measured by the hot air temperature sensor a and the exhaust air temperature B measured by the exhaust air temperature sensor b are weighted by being substituted into the following arithmetic expression K×A+(1−K)B. An average value is determined, and the weighted average value can be used as the detected grain temperature C when the grain is discharged from the down-flow drying chamber 9.

Here, the weight constant K is the weight constant of the seed grain. a type b Grain moisture content D It is best to make it a "variable constant" depending on the conditions.

Specifically, as shown in FIG. 4, between beer wheat and ordinary paddy, beer wheat is more easily affected by the drying temperature, so the "weight constant K" is set higher overall. When the "weight constant K" is increased, the "detected grain temperature C" becomes higher, thereby allowing low-temperature drying.
On the other hand, since paddy germinates even if it is dried at a slightly higher temperature than beer wheat, the "weighting constant K" is determined to be low overall in consideration of efficiency. When the "weighting constant K" is lowered, the "detected grain temperature C" becomes lower.
Can be dried at high temperatures.

Further, the "weight constant K" is determined in stages according to the moisture content D of the grain. This is because when the moisture content D is low, germination will occur even if the seeds are dried at high temperatures.

12 are perforated plates on both sides of the downstream drying chambers 9, 1;
3 is a burner connected to the hot air supply chamber 10;
4 is a hot air fan connected to the drying chamber 7, 15 is a fuel tank, 16 is a fuel pump, 17 is a fuel valve,
18 is a humidity control section installed in the upper part of the drying room 7;
It has a large humidity control tank 19, and the humidity control tank 19
A pair of left and right funnels 20, 20 are formed at the bottom of the , and the lower end openings 21, 21 of the funnels 20, 20 are as follows.
It fits into the upper ends 22, 22 of the down-flow type dryer 9, 9, respectively. A moisture meter d is installed in the funnel 20 to measure the moisture content D of the grains.

Reference numeral 25 indicates an elevator for lifting the grain discharged from the spiral conveyor 6, 26 indicates a discharge gutter thereof, and 27 indicates an upper conveyor. At a desired position outside the elevator 25, there is an outside temperature sensor for measuring the outside air temperature around the outer periphery of the elevator 25. A sensor 28 is provided.

FIG. 3 shows a control circuit that can be used for moisture measurement according to the present invention. D converter 2
Connect to 9. 30 is a central processing unit, 31 is a ram,
32 is a ROM, 33 is an operation unit, 34 is an input port,
35 is a display section, 36 and 37 are output ports, and 38 is a transport motor of the elevator 25.

(effect) Next, we will discuss the effect.

First, when the type of grain to be dried and the amount of grain to be dried are inputted using the operation section 33, for example, "4 koku of beer barley", the central processing section 30 calculates the drying temperature T in accordance with this data.

Assuming that the moisture content of the loaded undried beer barley is 32%, the "weight constant K" of the beer barley at that time is "0.8", so this is input to the central processing unit 30, and the elevator 25 is operated. When beer barley is supplied from the loading port at the lower end, it ascends the elevator 25 and falls from the upper conveyor 27 through the discharge gutter 26 into the humidity control tank 19, filling the flowing drying humidity 9.
The hot air supplied from the burner 13 via the hot air supply humidifier 10 is delivered by the rotary valves 4, 4 and discharged to the elevator 25 by the spiral conveyor 6, and is circulated and supplied into the humidity control tank 19 by the elevator 25. Ru.

Therefore, during the initial drying process, especially with the hot air temperature sensor a.
Assuming that hot air temperature = A = 42℃ and exhaust air temperature B = 20℃ using exhaust air temperature sensor b and moisture meter d, (from Figure 4, the weight constant K for beer barley is 0.8 when the moisture content is 32%). ”),
"Detected grain temperature C", which is a weighted average value, is 0.8 × 42 + (1-0.8) × 20 = 37.6 °C from the arithmetic formula of detected grain temperature C = K × A + (1-K) B. . In this case, when the drying set temperature T is, for example, 38°C, C=37.6°C<T=38°C, which means that the drying temperature is within the upper limit, and the drying operation is continued as is.

As the drying process progresses, hot air temperature sensor a, exhaust air temperature sensor b, and moisture meter d measure the following: hot air temperature A = 44°C, exhaust air temperature B = 24°C, and moisture content = 28%. In this case, the "weight constant K" of beer barley is "0.6" when the moisture content is 28% from Figure 4, so the "detected grain temperature C" which is the weighted average value at this time is K×A+( From the arithmetic formula 1-K)B, 0.6×44+(1-0.6)×24=36℃.

According to this method, when grain work is progressing and the weighting constant K is not changed, for example, the hot air temperature A = 44℃, the exhaust air temperature B = 24℃, and K = 0.8, and these results are expressed as K When substituted into ×A+(1-K)B, it becomes 0.8×44+(1-0.8)×24=40℃, which means that C=40℃>T=38℃, which exceeds the upper limit.

(Effects) Conventionally, a method of measuring grain temperature using a measuring device in a grain drying apparatus is well known. However, the method of measuring grain temperature using a measuring device differs depending on whether the grain is dense or thin, and cannot be measured accurately.

However, the present invention includes a downstream drying chamber 9, a hot air supply chamber 10 that supplies hot air to the downstream drying chamber 9,
Hot air exhaust chamber 1 from which air is discharged from the downstream drying chamber 9
1, in which the hot air supply chamber 10
A method of measuring grain temperature in a grain drying apparatus is to install a hot air temperature sensor a inside the hot air exhaust chamber and an exhaust air temperature sensor b inside the hot air exhaust chamber, and to assume the grain temperature from the measured values of both sensors a and b. Because of this, grain temperature can be measured without affecting grain density. It can also be used for automatic temperature control.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the grain drying apparatus, FIG. 2 is a side view thereof, FIG. 3 is a block circuit diagram, and FIG. 4 is a graph showing the relationship between weighting constants and moisture content. Explanation of symbols, 1...Grain collecting section, 2...Weighing scale, 3
...Inflow section, 4... Rotary valve, 5... Receiving gutter, 6...
Spiral conveyor, 7... Drying room, 8... Lower discharge port, 9... Downstream drying room, 10... Hot air supply room,
11... Hot air exhaust chamber, 12... Perforated plate, 13...
Burner, 14...Exhaust fan, 15...Fuel tank, 16...Fuel pump, 17...Fuel valve,
18...Humidity control section, 19...Humidity control tank, 20...
Funnel, 21... Lower end opening, 22... Upper end, 24
... Grain temperature sensor, 25 ... Elevator, 26 ...
Discharge gutter, 27... Upper conveyor, 28... Outside temperature sensor, 29... A/D converter, 30... Central processing section, 31... Ram, 32... ROM, 33...
Operation unit, 34...input port, 35...display unit,
36, 37... Output port, 38... Conveyance motor, a... Hot air temperature sensor, b... Exhaust air temperature sensor, d... Moisture meter, A... Hot air temperature, B... Exhaust air temperature, C... ...detected grain temperature, T...drying set temperature.

Claims (1)

[Claims] 1 A device comprising a downstream drying chamber 9, a hot air supply chamber 10 that supplies hot air to the downstream drying chamber 9, and a hot air exhaust chamber 11 that discharges air from the downstream drying chamber 9, in which the hot air A hot air temperature sensor a is installed in the supply chamber 10, and an exhaust air temperature sensor b is installed in the hot air exhaust chamber.
A method for measuring grain temperature in a grain drying apparatus in which the grain temperature is estimated from the measured values of both sensors a and