JPH0319943B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a grain moisture measuring device.

Conventional technology In conventional moisture meters that measure grain moisture using capacitance, the density of the grain inside the measurement chamber containing the anode is significantly affected by the shape of the grain, the roughness of the grain surface, etc. This difference causes a large error in the measured moisture value, and the mechanism is complicated, resulting in frequent failures.

To deal with this problem, in addition to measuring grain moisture with a grain moisture meter, it is possible to measure grain density and correct the measured moisture value using this density measurement value. If moisture is measured and grain density is measured at different locations, the true grain density for the grain at the time the grain moisture is measured may not be measured due to the time lag associated with the different locations. , errors occur and the measurement mechanism becomes complicated.

Furthermore, a weighing hopper provided with an electrode for measuring the moisture content of the sample has been proposed in Japanese Utility Model Application No. 55-116230.

Furthermore, the measuring tube is connected to a weighing scale, grains are retained in the measuring tube, the grain density is measured by the load on the measuring tube, and the output of the electrode plate of the moisture content meter is corrected using this measurement output. A moisture content measuring device for a circulating grain dryer has been proposed in Japanese Patent Application Laid-open No. 55-23458.

Problems to be Solved by the Invention However, the method described in Japanese Utility Model Application Publication No. 116230/1983 pushes a moisture measuring electrode into a sample and measures the moisture content with a moisture meter connected to the moisture measuring electrode. It was the one I made.

In addition, the one described in Japanese Patent Application Laid-open No. 55-23458 is
The grains constantly flow inside the measuring cylinder, and since the measuring cylinder of the weighing scale and the electrode plate of the moisture content meter are arranged vertically, both the electrode plate part and the weighing part can stably measure the moisture content of the grains. It was impossible to measure the weight.

It is an object of the present invention to address the above-mentioned problems and to
After supplying a predetermined amount of grain to a metering container and stopping its discharge, the grain density is stably measured by a weighing device, and at the same time, the grain moisture is measured by a moisture sensor in this state. The grain moisture value is automatically density-corrected by the correction circuit of the control circuit based on the density, and the error caused by the deviation between the position where the moisture of the grain is measured and the position where the density of the grain is measured is corrected. Errors due to differences in location are not generated, errors due to density unevenness of grains are prevented, the measurement mechanism is simplified, causes of failure are eliminated, the measurement performance is reliably improved, and the moisture content is always constant. It is an object of the present invention to provide a grain moisture measuring device that can achieve effects such as accurately and smoothly mass producing grains of high quality.

Means for Solving the Problems The grain moisture measuring device of the present invention connects a quantitative container provided with a moisture sensor on the inner wall to a weighing device, provides a discharge valve at the bottom of the quantitative container so as to be openable and closable, and The device and the moisture sensor are each connected to a correction circuit of a control circuit that corrects the moisture value of the grain measured by the moisture sensor based on the density of the grain measured by the weighing device. It is something that you have.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In Fig. 1, 1 is a grain tank 34 such as a grain dryer.
It is a machine frame provided on the side of the machine frame 1, and on one side of the upper part of the machine frame 1, a grain feeding port 2 is provided with an upward opening.
A grain removal port 3 is provided at the bottom of the machine frame 1 and opens downward, and a grain removal port 3 is provided in the wall of the grain tank 34.
5 and the grain feeding port 2 of the machine frame 1 are connected by a grain flow path 36, and the sample grains in the grain tank 34 are configured to flow down from the grain feeding port 2 onto the grain conveying gutter 6 and be supplied. ing.

A metering container 8 is mounted inside the machine frame 1 facing below the grain conveying gutter 6 , a fixing plate 4 is provided at the bottom of the grain conveying gutter 6 , and the metering container 8 is placed below the fixing plate 4 . It is connected to a weighing device 7 provided at

A moisture sensor 18 is attached to the inner wall surface of the cylindrical body 17A with the upper part of the metering container 8 open, and a grain conveying device equipped with a vibration device 5 is mounted on the fixed plate 4 above the cylinder 17A of the metering container 8. A gutter 6 is mounted to serve as a grain feeding device, and an on-off valve 19 serving as a discharge valve is provided at the bottom of the cylindrical body 17A so as to be openable and closable, and an on-off actuating device 20 is connected to the on-off valve 19.

Inside the machine frame 1, there is a fixed frame 10 provided at the lower part of the fixed plate 4 with a hanging rod part 9 protruding toward the quantitative container 8 at the upper end, and a horizontal rod part 11 protruding toward the fixed frame 10 near the center. The fixed frame 10 and the movable frame 12 are connected to each other by a connecting rod 13, and the movable frame 12 is vertically movable. 10 suspension rods 9
and the horizontal rod part 11 of the moving frame 12 are connected by a spring scale 16 equipped with a spring 14, a weighing amount detecting part 15, etc., and the cylinder 17A of the quantitative container 8 is attached to the moving frame 12.

A shaft portion of a solenoid 21 and an on-off valve 19 are connected to the on-off actuating device 20 by an on-off link 22 .

A container for a control circuit A including a display 30 is attached to the side of the machine frame 1.

In the metering container 8 shown in FIG. 1, grains are supplied by flowing down from the gutter end of the upper grain conveying gutter 6 to the cylinder 17A formed to have a predetermined capacity by the vibration action of the vibration device 5. It is configured to measure the weight of the grain that has formed an angle of repose at the top of the.

The electric circuit 7' of the weighing device 7, the electric circuit 5' of the vibrating device 5, the electric circuit 18' of the moisture sensor 18, and the electric circuit 20' of the on-off actuator 20 of the on-off valve 19 are interconnected via the control circuit A. have been contacted in connection with.

The vibration of the vibration device 5 causes sample grains to flow down from the gutter end of the grain conveying gutter 6 to the cylindrical body 17A of the metering container 8, and the weighing device 7 measures an arbitrary predetermined grain density, and the grain moisture is measured. is measured by a moisture sensor 18, and the grain whose moisture content has been measured is discharged via an on-off valve 19, and this moisture measurement operation is configured to be repeated continuously.

FIG. 3 shows a control circuit A that measures the weight of grains in the quantitative container 8 formed to a predetermined capacity as shown in FIG. 1 and corrects the moisture value of the moisture sensor 18. , the output side of the moisture sensor 18 consisting of a power supply and a capacitance-voltage converter (CV converter) B, and the output side of the weight detector 27 correct the moisture value measured by the moisture sensor 18 according to the grain density. The input sides of the correction circuit 28 are connected to each other, and the output side of the correction circuit 28 is connected to a display 30 via an amplifier 29 and a contact R1 of a relay.

FIG. 4 shows an electric circuit for the vibrating device installed in the control circuit A of the metering container 8 in FIG. has been done.

The detection signal from the moisture sensor 18 is compared with the detection signal from the weight detector 27 in a correction circuit 28 and appropriately corrected by addition or subtraction, and the correction signal is amplified by an amplifier 29 and transmitted. Ru.

On the other hand, a timer 31 installed in the electric circuit shown in FIG.
When a predetermined grain feeding time has elapsed, relay R1 is energized, and relay R1 opens an on/off contact (not shown) provided in vibrating device 5, and the vibrating device 5 vibrates grain conveying gutter 6. is stopped, the grain feeding action to the cylindrical body 17A of the metering container 8 is interrupted, and the contact R1 of the relay of the control circuit A in FIG. metering container 8 supplied with a predetermined volume of grains
Then, the subsequent grain feeding action by the vibrating device 5 is stopped, and the measured moisture value stably measured by the moisture sensor 18 is density-corrected by the correction circuit 28 according to the change in the weight of the weighed grains. The corrected and accurate moisture value is automatically displayed on the display 30.

Next, the operation of this embodiment will be explained.

The sample grains flowing down from the grain tank 34 to the grain conveying gutter 6 through the grain flow path 36 and the grain feeding port 2 are moved by the vibrating device 5.
The grain conveying gutter 6 is vibrated by the operation of the vibration device 5.
Due to the vibration effect, the grains flow down from the gutter end of the grain conveying gutter 6 to the metering container 8 and are supplied (see Fig. 1), and when a layer of grains at the angle of repose is formed on the upper part of the cylindrical body 17A of the metering container 8, the grains are immediately controlled. Timer 31 installed in circuit A
The vibration device 5 is stopped by the stop signal from the relay R1, and the flow of grains from the grain conveying gutter 6 to the metering container 8 is stopped.

Next, the weighing device 7 weighs the quantitative container 8 into which a predetermined amount of grain has been fed, and the weight of the grain is measured.The weight detector 27 inputs the detection signal to the correction circuit 28 of the control circuit A. At the same time, moisture sensor 18
measures the capacitance of the grains in the cylindrical body 17A of the metering container 8, and sends the detected signal to the correction circuit 2 of the control circuit A.
8, the correction circuit 28 of the control circuit A corrects the moisture value measured by the moisture sensor 18 to an arbitrary predetermined density, and controls the corrected moisture value via the amplifier 29 and the closed relay contact R1. It is displayed on the display 30 provided in the circuit A container.

The grains in the cylindrical body 17A of the metering container 8 for which the moisture measurement has been completed operate the solenoid 21 of the opening/closing actuator 20 in response to the completion signal from the timer 31, and the grains are transferred to the opening/closing valve 19 via the opening/closing link 22. Rotate, cylinder 1
7A is opened, the grains in the cylinder 17A are discharged into the machine frame 1, and when the grains in the cylinder 17A are completely discharged, the solenoid 21 of the opening/closing actuating device 20 is activated, and the opening/closing valve 19 is activated. The bottom of the cylindrical body 17A is closed, and grains are supplied into the cylindrical body 17A again by the vibrating device 5 to continuously measure the moisture content.

FIG. 2 shows another embodiment of the present invention, in which the cylinder 17B of the metering container 8 is formed to have an arbitrary capacity, the metering container 8 is connected to the weighing device 7, and the upper part of the inner wall surface of the cylinder 17B is A capacitance measurement section 23 for volume measurement is attached.

Cylindrical body 17B of quantitative container 8 formed to any capacity
The grains are supplied by flowing down from the gutter end of the upper grain conveying gutter 6 due to the vibrating action of the vibrating device 5, and a predetermined weight of grains is measured in the cylinder 17B, and its capacity is calculated by measuring the grain in the cylinder 17B. The capacitance measurement unit 2 is configured to perform measurement using a capacitance measurement unit 23 mounted on the inner wall and mounted on the cylindrical body 17B.
3 is a case in which the moisture sensor 18 is installed above the grain in the cylindrical body 17B and the measurement is performed based on a detection signal;
In some cases, a capacitance measuring device 24 such as a variable resistance attenuator is separately provided and the measurement is performed using the capacitance measuring device 24.

Opening/closing valve 1 provided at the bottom of the cylindrical body 17B so as to be openable and closable
The opening/closing actuating device No. 9 is configured to include a rotary cam mechanism 25 which is connected to or detached from the locking rod 26 of the opening/closing valve 19 to open and close the bottom of the cylindrical body 17B.

Since the other configurations are completely the same as the embodiment shown in FIG. 1, the same parts are given the same reference numerals and the explanation will be omitted.

FIG. 5 shows an electric circuit for a vibrating device provided in the control circuit A of the metering container 8 of FIG. The detector 27 and the setting device 32 are connected to the input sides of a comparator 33, and the output side of the comparator 33 is connected to the vibration device 5 via a relay R1.

The detection signal from the weight detector 27 and the setting device 32
An output based on an arbitrary grain weight set in advance is input to the comparator 33, and a coincidence signal from the comparator 33 excites relay R1, which is connected to the vibration device 5. An opening/closing contact (not shown) is opened, the vibration of the grain conveying gutter 6 by the vibration device 5 is stopped, the grain feeding action of the grain conveying gutter 6 is interrupted, and the contact R of the relay shown in FIG.
1 is closed, and the correction circuit 28 of the control circuit A and the display 30 are brought into conduction.

FIG. 6 shows a control circuit A that measures the weight of grains in the quantitative container 8 formed to an arbitrary capacity as shown in FIG. 2 and corrects the moisture value of the moisture sensor 18. A capacitance measuring section 23 is installed in place of the weight detector 27 in FIG. 3, and the output side of the capacitance measuring section 23 is connected to the input side of a correction circuit 28. The rest of the configuration is the same as that of the control circuit in FIG. 3, the same parts are given the same reference numerals, and it operates in the same way as the control circuit in FIG. At the same time, the grain capacity is reliably measured, the density is corrected by the correction circuit 28 according to the change in the grain capacity, and the corrected accurate moisture value is automatically displayed on the display 30. Become.

Next, the operation of this embodiment will be explained. Grain tank 34
The sample grains flowing down onto the grain conveying gutter 6 through the grain flow channel 36 and the grain feeding port 2 are moved from the gutter end of the grain conveying gutter 6 to the cylindrical body of the lower metering container 8 by the vibration action of the vibrating device 5. 17B and is supplied to the quantitative container 8.
The weight of the grain is measured by the weighing device 7, and when the predetermined weight is reached and the output set in the setting device 32 and the detection signal from the weight detector 27 match, the output signal from the comparator 33 is used. Then, the relay R1 is activated, and at the same time as the operation of the vibration device 5 is stopped, the contact R1 of the relay is closed, and the supply of grains from the grain conveying gutter 6 to the cylinder 17B by the vibration device 5 is stopped.

Then, the moisture sensor 18 immediately switches to the cylinder body 17B.
The capacitance measurement unit 23 measures the capacitance and inputs each detection signal to the correction circuit 28 of the control circuit A, and the correction circuit 28 arbitrarily adjusts the measured moisture value. The correct grain moisture value is automatically displayed on the display 30 via the amplifier 28 and the closed relay contact R1.

Note that the weighing device used in the present invention includes a weight scale, a spring scale, a load cell, and the like.

Effects of the Invention As described above, according to the grain moisture measuring device of the present invention, a metering container provided with a moisture sensor on the inner wall is connected to a weighing device, and a discharge valve is provided at the bottom of the metering container so as to be openable and closable. By connecting the weighing device and the moisture sensor to the correction circuit of the control circuit that corrects the moisture value of the grain measured by the moisture sensor based on the density of the grain measured by the weighing device, The grain density can be stably measured by a weighing device in a state where the capacity of grain is fed and its discharge is stopped, and at the same time, the grain moisture can be measured by a moisture sensor in that state. Since the grain moisture value is automatically density-corrected by the correction circuit of the control circuit based on There are no errors caused by differences in location, and errors due to uneven grain density can be prevented.The measurement mechanism is also simplified, eliminating causes of failure, and improving measurement performance. This allows for accurate and smooth mass production of high-quality grains with constant moisture content.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a grain moisture measuring device according to an embodiment of the present invention, FIG. 2 is a side sectional view of a grain moisture measuring device according to another embodiment of the present invention, and FIG. 1 is a control circuit diagram, FIG. 4 is an electric circuit diagram for the vibration device in FIG. 1, FIG. 5 is an electric circuit diagram for the vibration device in FIG. 2, and FIG. 6 is an electric circuit diagram for the vibration device in FIG. It is an electrical circuit diagram. 1... Machine frame, 2... Grain feeding port, 3... Grain discharging port, 4... Fixed plate, 5... Vibration device, 5'... Electric circuit, 6... Grain transport gutter, 7... Weighing device, 7'... Electric circuit , 8... quantitative container, 9... hanging rod part, 10... fixed frame, 11... horizontal rod part, 12... moving frame, 13... connecting rod, 14... spring, 1
5...Weighing detection section, 16...Spring scale, 17A, 17B
...Cylinder, 18...Moisture sensor, 18'...Electric circuit,
19... Opening/closing valve, 20... Opening/closing actuating device, 20'... Electric circuit, 21... Solenoid, 22... Opening/closing link,
23... Capacitance measuring unit, 24... Capacity measuring device, 25... Rotating cam mechanism, 26... Locking protrusion, 27... Weight detector, 28... Correction circuit, 29... Amplifier, 30... Display, 31... Timer, 32... Setting device, 33... Comparator, 34... Grain tank, 35... Grain outlet, 36... Grain flow path, A... Control circuit, B... Power supply C-V converter, R1
…relay.

Claims (1)

[Claims] 1. A metering container provided with a moisture sensor on the inner wall is connected to a weighing device, a discharge valve is provided at the bottom of the metering container so as to be openable and closable, and the weighing device and the moisture sensor are connected to the grains to be measured by the moisture sensor. A grain moisture measuring device, characterized in that each of the control circuits is connected to a correction circuit of a control circuit that corrects a moisture value based on the density of grain measured by the weighing device.