JPS6231266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moisture content measuring device for a grain dryer that dries grains using hot air.

An object of the present invention is to provide a moisture content measuring device for a grain dryer that can improve measurement accuracy.

In order to achieve the above object, the present invention provides a moisture content meter A for detecting the moisture content of grains during drying.
and a grain temperature detection device B that detects the temperature of the grains during drying, and when the grain temperature detected by the grain temperature detection device B is equal to or higher than a predetermined value, the temperature becomes constant according to an increase in the temperature difference from the predetermined value. and a control device G that corrects the measured value of the moisture content meter A to a lower value at a ratio of .

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

In FIGS. 1 to 3, numeral 1 indicates a grain dryer, which is constructed as follows. That is, reference numeral 3 denotes a storage chamber, in which an upper transfer spiral 4 for loading grains is installed horizontally, and a discharge port 5 of the upper transfer spiral 4 is located at the upper center of the storage chamber 3. 6
is a dispersing rotor, and the discharge port 5 of the upper transfer spiral 4
It is located below.

7, 7 is a drying room, each of which has ventilation frames 8, 8 such as wire mesh or perforated iron plates erected with a predetermined width;
The drying chambers 7, 7 are connected to each other via hopper-shaped portions 9, 9 provided at the lower part of the storage chamber 3.

Reference numeral 10 denotes a grain harvesting chamber, which is located below the drying chambers 7, 7 and through which the grains flow down.
1 is installed horizontally.

A hot air chamber 12 is provided between the drying chambers 7, 7 so that hot air is blown into the hot air chamber 12 from the burner 2.

Reference numeral 13 denotes an air exhaust chamber, which is provided outside the drying chambers 7, 7, respectively, and communicates with a suction fan 14 that exhausts air to the outside of the machine.

15, 15 is a rotary valve, drying chamber 7,
It is rotatably provided at the lower part of the grain harvesting chamber 7 and slowly feeds the grains into the grain harvesting chamber 10.

Reference numeral 16 denotes an elevator, whose lower end communicates with the lower transfer spiral 11 described below, and whose upper end communicates with the upper transfer spiral 4 via a supply hopper 17.

A hopper 18 has a lower end communicating with the lower part of the elevator 16.

A is a moisture content meter, B is a grain temperature detection device, and C is a hot air temperature detection device.The moisture content meter A is attached to the machine wall 3a of the storage chamber 3 and detects the moisture content of the grains during drying. Further, a grain temperature detection device B is installed near the electrode of the moisture content meter A to detect the temperature of the grains during drying, and a hot air temperature detection device C is installed in the hot air chamber 12 or the like. The temperature of the hot air supplied to the drying chamber 7 is detected.

Reference numeral 19 denotes a control panel in which a control device 20 is installed, and an outside temperature detection device D and a grain amount setting device E are attached to this control panel 19.

The control device 20 includes a moisture content meter A, a grain temperature detection device B, a hot air temperature detection device C, and an outside temperature detection device D.
and a grain amount setting device E are connected.

P is a fuel pump that controls the amount of fuel supplied to the burner 2.

The moisture content meter A is constructed as follows. That is, as shown in FIG.
A motor 22 capable of forward and reverse rotation is housed in a case 21, and a rotating cylinder 26 is connected to its output shaft 23 via gears 24 and 25. 27 is a bearing for the rotating cylinder 26.

A key groove 28 is formed inside the rotary tube 26, and the base end of the electrode rod 30 is slidably connected to the rotary tube 26 via a key 29 that fits into the key groove 28.

31 is an extruded metal that moves only in the left and right direction, and is screwed into a screw 32 carved in the center of the electrode rod 30.
An expansion spring 33 interposed between the extruded metal A31 and the bearing 27 urges the electrode rod 30 toward its tip.

A gutter-like plate 34 is vertically fixed to the inner surface of the machine wall 3a, and its upper edge is sloped low toward the inside of the storage chamber 32 to reduce the resistance of grains flowing down. Gutter plate 34
A receiving plate 35 having an uneven surface is attached to the inner surface of the electrode rod 30 so as to face the tip of the electrode rod 30.

Numeral 36 is a threaded rod with bearings on both left and right ends, and connects the gear 37 to the gear 25. A movable metal 38 is screwed into the screw rod 36, and the movable metal 38 is keyed into a keyway 40 formed on the lower surface of the machine frame 39.

Reference numeral 41 denotes a shutter plate which extends freely in and out below the gutter-like plate 34 and is biased toward the inside of the storage chamber 3 by a contraction spring 42 . At the center of the upper surface of the shutter plate 41, a locking piece 41a is erected, and a screw rod 3
There are limit switches LS-1 near both left and right ends of 6.
Install LS-2. 41b is the shutter plate 41
It shows a stopper formed by bending the end of the .

The moisture content meter A operates as follows.

First, the motor 22 begins to rotate forward, which causes the rotating cylinder 26 and screw rod 36 to rotate, and the electrode rod 30
is pushed out by the metal 31, and the shutter plate 41 is moved by the moving metal 38 into the storage chamber 3.
protrude inward. When the moving metal 38 contacts the limit switch LS-1, the motor 22
is cut, and the electrode rod 30 is locked at a position with a slight gap between it and the receiving plate 35 as shown by the solid line in FIG. is applied, the moisture content is measured from the resistance, and the data voltage Es is output.

When a certain period of time (for example, 10 seconds) has elapsed after the start of locking, the motor 22 is reversed, the electrode rod 30 is moved back by the extruded metal 31, and the shutter plate 41 is moved back by the moving metal 38. And the moving metal 38 is the limit switch LS-2
When it comes into contact with the motor 22, the motor 22 is turned off, thereby retracting the electrode rod 30 and the shutter plate 41 to their original positions.

The grain temperature detection device B includes a receiving plate 35 of a gutter-like plate 34.
installed below.

When the grain temperature detected by the grain temperature detection device B is equal to or higher than a predetermined value, the moisture content meter A is measured at a constant rate according to the increase in temperature difference from the predetermined value. It is connected to a moisture measuring circuit G with grain temperature correction as a control device that corrects the measured value of the meter A to a lower value, and a moisture content display circuit H is connected to the output side of the moisture measuring circuit G with grain temperature correction. Further, the grain temperature detection device B is connected to the moisture measurement circuit G with grain temperature correction via the grain temperature measurement circuit I. In the moisture measuring circuit G with grain temperature correction, when the grain temperature t inputted from the grain temperature measuring circuit I is higher than a predetermined value of 20°C, the moisture content inputted from the moisture measuring circuit F is calculated every time the grain temperature t increases by 1°C. The value of the ratio is corrected by subtracting a certain percentage of 0.1%, and this correction value is displayed on the display circuit H. For example, if the grain temperature t measured by grain temperature measurement circuit I is 25°C and the moisture content measured by moisture measurement circuit F is 15%, subtract 0.5% from this measurement value 15% to 14.5. %, and this corrected moisture content of 14.5% is displayed on the moisture content display circuit H.

A comparison circuit K is connected to the output side of the grain temperature measurement circuit I, and a fuel control circuit V is connected to the output side of this comparison circuit K.
-2 to the fuel control circuit V. A grain temperature setting circuit L is connected to the input side of the grain temperature measuring circuit I.

Furthermore, the hot air temperature detection device C is connected to the comparison circuit N via the hot air temperature measurement circuit M. The output side of this comparison circuit N is connected to a fuel control circuit V via a fuel control circuit V-1. An outside temperature detection device D and a grain amount setting device E are connected to the input side of the comparison circuit N via a hot air temperature calculation circuit Q.

A burner 2 is connected to the fuel control circuit V via a fuel pump P. The fuel control circuit V outputs a signal to increase the amount of fuel supplied to the fuel pump P only when signals to increase the amount of fuel supplied are issued from both the fuel control circuits V-1 and V-2. .

In the above configuration, when drying grains, the temperature of the grain temperature setting circuit L is set. As an example, the grain temperature is about 40°C. Also,
The hot air temperature is set by the hot air temperature calculation circuit Q based on the set value of the grain amount setting device E and the outside temperature detected by the outside temperature detection device D.

In this way, when the grain temperature and the hot air temperature are set and the drying work is started, the temperature of the grain being dried is detected by the grain temperature detection device B, and the temperature of the grain being dried is detected by the hot air temperature detection device C. The hot air temperature within 12 is detected.

Further, the data voltage Es of the moisture content meter A is converted into a digital measured moisture content Ms in a moisture measuring circuit F.

This measured moisture content Ms is determined by the measured grain temperature value t, which is a digital quantity, converted by the grain temperature measuring circuit I from the grain temperature detected by the grain temperature detection device B in the moisture measuring circuit G with grain temperature correction. Corrected. That is, it is determined whether the measured grain temperature value t is higher than 20℃, and if t<20℃, the measured moisture content Ms is directly displayed on the moisture content display circuit H, and if t>20, s=Ms−t The measured moisture content Ms is corrected according to the relational expression -20°C/10, and the moisture content s is calculated and displayed on the moisture content display circuit H.

For example, if the measured grain temperature value t is 25℃, the measured moisture content
When Ms is 15%, the corrected moisture content s is s = 15% - (25 - 20/10) = 14.5%.

On the other hand, the hot air temperature detected by the hot air temperature detection device C is converted into a digital measured hot air temperature value T by the hot air temperature measurement circuit M, and compared with the set hot air temperature by the comparison circuit N. has not reached the set hot air temperature, the fuel control circuit V-
1 can generate an increase signal for the fuel supply amount. In addition, the measured grain temperature value t converted by the grain temperature measurement circuit L is compared with the set grain temperature in the comparison circuit K, and when the measured grain temperature value t has not reached the set grain temperature, the fuel control circuit V-2 A signal will appear to increase the amount of fuel supplied. In this way, only when an increase signal for the fuel supply amount is output from both fuel control circuits V-1 and V-2, an increase signal for the fuel supply amount is output from the fuel control circuit V, and the fuel from the fuel pump P is increased. Increase supply.

Then, when the hot air temperature rises and the measured hot air temperature value T reaches the set hot air temperature, a fuel supply amount reduction signal is output from the fuel control circuit V-1, and the fuel is supplied from the fuel pump P via the fuel control circuit V. The feed rate is reduced to prevent temperature rise above the set point. Also,
When the temperature of the grain also rises and the measured grain temperature t reaches the set grain temperature, a fuel supply amount reduction signal is output from the fuel control circuit V-2, and the fuel is supplied from the fuel pump P via the fuel control circuit V. supply is reduced to prevent temperature rise above the set point.

As is clear from the above description, according to the configuration of the present invention, the moisture content of the grain is detected by the moisture content meter, the grain temperature at this time is detected by the grain temperature detection device, and the grain temperature is detected by the grain temperature detection device. When the grain temperature exceeds a predetermined value, the control device lowers the measured value of the moisture content meter at a fixed rate according to the increase in temperature difference from the predetermined value. However, the accuracy of grain moisture content display can be improved.

Note that this invention is not limited to the above-described embodiments. For example, if the grain temperature detection device is in a position where it can properly detect the temperature of the grains being dried,
It can be installed anywhere.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view showing a part of a dryer equipped with the device of the invention, Fig. 2 is a front view, and Fig. 3 is a front view. A sectional view, Figure 4 is a side sectional view of the moisture content meter, and Figure 5 is a side sectional view of the moisture content meter.
The figure is a block diagram. (Explanation of symbols representing main parts of the drawing), A
... Moisture content meter, B ... Grain temperature detection device, G ... Moisture measurement circuit with grain temperature correction (control device).

Claims (1)

[Claims] 1. A moisture content meter that detects the moisture content of the grains being dried, a grain temperature detection device that detects the temperature of the grains that are being dried, and when the grain temperature detected by the grain temperature detection device is equal to or higher than a predetermined value. and a control device that corrects the measured value of the moisture content meter to a lower value at a constant rate in accordance with an increase in temperature difference from a predetermined value.