JPS6314776B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in grain moisture measuring devices.

Conventional moisture meters that measure grain moisture using capacitance have problems because the grain density inside the measurement chamber containing the anode varies significantly depending on the shape of the grain, the roughness of the grain surface, etc. This causes a large error in the measured moisture value.
Furthermore, the mechanism has become complicated and failures often occur.

In addition, a measuring tube is connected to a weighing scale, grains remain in the measuring tube, the grain density is measured by the load of the measuring tube, and the output of the electrode plate of the moisture content meter is corrected using this measurement output. This product has been proposed as No. 55-23458, but this device does not have a moisture sensor in the measuring tube, and the grains supplied to the part where the electrode plate is provided are sent from the measuring tube or funnel to its outlet. Because the grain flows down at a large flow rate, the angle of repose of the upper surface of the grain in the area where the electrode plate is installed does not reach its natural state, and the state changes greatly. As a result, the moisture value measured by the electrode plate fluctuates greatly. The measuring tube of the weight scale and the electrode plate of the moisture content meter are arranged vertically, so
It is not possible to measure the moisture content of the grains in a stable state, and the weighing tube falls under the load of the grains staying in the measuring tube, and the scale uses the grain density inside the measuring tube as the measurement voltage. The reference voltage of the moisture content meter is made to match the voltage measured by the electrode plate in advance, and the measurement output of the moisture content meter due to the potential difference between the reference voltage and the measurement voltage is corrected by the measurement output of the weight scale, so the control circuit This was complicated, and the moisture content of the grains was displayed on the display as the measuring cylinder was lowered, and it was not possible to display the moisture content of the grains at the same time as the feeding action stopped.

Furthermore, JP-A-55-31951 discloses a device that connects a measuring section with a sensor inside to a weighing device, and provides a bottom lid that can be opened and closed at the bottom of the measuring section to measure the moisture content with the grain always at a constant weight. In this case, too, the paddy flows down from the paddy guide mechanism into the cylindrical electrode at a large flow rate, and the upper surface of the paddy does not have a natural angle of repose, and the state changes greatly, causing water absorption by the electrode. The rate measurements varied widely.

The present invention sparsely supplies grains flowing down from a grain conveying gutter to a measurement container by the vibration action of a vibration device, and measures the grains flowing down as a small flow rate into a measurement container equipped with a moisture sensor on the inner wall. Fill the measuring container, let the upper surface overflow at the natural angle of repose, fill the measuring container with a fixed volume of grain, and measure the grain density in the measuring container with a weighing device in a stable state. At the same time, it is an object of the present invention to provide correction of grain moisture values that can easily and reliably correct grain moisture values based on grain density by measuring the grain moisture with a sensor.

In order to achieve this object, the grain moisture measuring device of the present invention connects a weighing device to a measuring container equipped with a moisture sensor on the inner wall, and has a grain conveying gutter equipped with a vibrating device in the upper part of the container. It has a configuration characterized by the following.

The present invention will be explained with reference to embodiment figures. A machine frame 1 is provided with a grain feeding port 2 on one side of the upper part and a grain discharging port 3 on the lower side, and a fixing plate 4 is installed on the upper side of the frame 1.
A grain conveying gutter 6 equipped with a vibrating device 5 is mounted on the plate 4, and a weighing device 7 is fixedly installed at the bottom of the fixed plate 4, and a measuring container 8 is mounted on one side thereof.
Or concatenate 9. The weighing device 7 has a fixed frame 10 with a protruding hanging rod part and a movable frame 11 with a protruding horizontal rod part arranged vertically in parallel, and each frame 10, 11 is connected by a connecting rod 12 so that it can be freely moved up and down. The hanging rod portions and horizontal rod portions of both frames 10 and 11 are connected to each other by a spring 14 provided on a spring balance 13 of the weighing device 7. The measurement container 8 or 9 is a cylinder 15A or 1 with an open top.
Moisture sensor 16A or 16B on the inner wall of 5B
At the same time, an on-off valve 17 is provided at the bottom and connected to an on-off device 18A or 18B.

The container 8 in FIG. 1 supplies grains by flowing down from the gutter end of the upper conveying gutter 6 to a cylindrical body 15A having a predetermined capacity, and measures the grain moisture with its moisture sensor 16A. The opening/closing device 18A is configured to open/close the opening/closing valve 17 using a solenoid 19 and a connecting rod 20. There is.

Next, in the container 9 of FIG. 2, a moisture sensor 16B consisting of a moisture measuring section b and a volume measuring section a is attached to the inner wall surface of a cylinder 15B with an open upper part, and a grain conveying gutter in the upper part is attached. A predetermined weight of grain is supplied by flowing down from the gutter end of No. 6, and the moisture of the grain is measured by the moisture measuring part b of the moisture sensor 16B, and the moisture of the part where the capacity changes is measured by the capacity measuring part a of the moisture sensor 16B. The opening/closing device 18B is provided with a rotary cam mechanism 21 to open and close the opening/closing valve 1.
It is formed so that it can be opened and closed by locking or separating from the locking rod 22 of No.7.

Further, an electric circuit 23 provided in the weighing device 7
and the electric circuit 24 provided in the vibrating device 5 are interconnected via a control circuit 25. The vibration device 5 is activated by a signal from the timer 26 provided in the control circuit 25, and its vibration causes the grains in the grain conveying gutter 6 to flow down and be supplied to the measuring container 8 or 9. At the same time, the grain feeding action is stopped by the stop signal of the timer 26. Therefore, an arbitrary predetermined weight of grain is supplied to the container 8 or 9, and the moisture sensor 16A is
measures the capacitance of the grains in the container 8 and inputs the detection signal to the control circuit 25. In the control circuit 25, the measured moisture value is density-corrected, and the moisture value is applied to the container of the control circuit 25. It is formed so as to be displayed on a display 27 provided in the.

The machine frame 1 also has a grain tank 28 such as a grain dryer.
The grain outlet 29 opened in the wall of the tank 28 and the grain feeding port 2 on the upper part of the machine frame 1 are connected by a grain flow path 30, and the sample grains in the grain tank 28 are It is formed so as to flow down and be supplied to the conveying gutter 6.

With the above-mentioned configuration, the sample grains flowing down from the grain tank 28 to the grain conveying gutter 6 via the grain flow path 30 are removed from the gutter end of the grain conveying gutter 6 by the vibration action of the vibrating device 5. The grains are supplied by flowing down into the measurement container 8 (see FIG. 1), and as soon as a grain layer of the angle of repose is formed on the upper part of the cylinder 15A, a timer 26 provided in the control circuit 25 (or a predetermined signal from the weighing device 7) is supplied. The vibrating device 5 stops in response to a stop signal (measurement of weight) to stop the supply of grains from the grain conveying gutter 6 to the container 8, and the weighing device 7 measures whether a predetermined amount of grain has been fed. Weigh the container 8, measure the weight of the grains, and input the signal to the control circuit 25. At the same time, the moisture sensor 16A measures the capacitance of the grains in the container 8 and sends the signal to the control circuit. 25, the control circuit 25 density-corrects the measured moisture value and displays the moisture value on a display 27 provided in the container of the control circuit 25. For the grains whose moisture content has been measured, the solenoid 19 of the opening/closing device 18A is actuated by the end signal from the timer 26, and the opening/closing valve 17 is opened to discharge the grains, and the control circuit 25 The on-off valve 17 is closed in response to the signal, and the moisture content of the grains is continuously measured.

In the apparatus of the second embodiment, the weight of the grains flowing down from the gutter end of the conveying gutter 6 to the lower container 9 is measured by the weighing device 7, and when a predetermined weight is reached, the weight of the grains flowing down from the gutter end of the conveying gutter 6 to the lower container 9 is measured by the detection signal. The vibration device 5 is stopped to interrupt the flow of grains from the grain conveying gutter 6, and immediately the moisture measuring section b of the sensor 166B measures the grain moisture value inside the cylinder, and the volume measuring section a measures the grain moisture value. The capacitance is measured, each detection signal is input to the control circuit 25, the measured moisture value is density-corrected, and the accurate grain moisture value is simply and automatically displayed on the display.

According to the present invention, the grains flowing down from the grain conveying gutter are sparsely supplied to the measuring container due to the vibration action of the vibration device, and the grains flowing down to the measuring container having a moisture sensor on the inner wall are supplied with a small flow rate. The grains are then filled into the measuring container, and the upper surface of the grains overflows at a natural angle of repose.The measuring container is then filled with a constant volume of grains, and in a stable state, the grain density in the measuring container is measured by a weighing device. At the same time, the grain moisture value is measured using a sensor, and the grain moisture value can be easily and reliably corrected based on the grain density.

[Brief explanation of the drawing]

The drawings are illustrations of embodiments of the present invention. FIG. 1 is a sectional side view of the device, and FIG. 2 is a sectional side view of another embodiment of the invention. 1... Machine frame, 2... Grain feeding port, 3... Discharge port, 4... Fixed plate, 5... Vibration device, 6... Grain conveyance gutter, 7... Weighing device, 8... Measuring container, 9... Measuring container, 10... Fixed frame, 11... Moving frame, 12... Continuous rod, 13... Spring balance, 14... Spring, 15A/15B... Cylindrical body, 16
A・16B... Moisture sensor, 17... Open/close valve, 18
A・18B...Switching device, 19...Solenoid, 20
...Connecting rod, 21... Rotating cam mechanism, 22... Locking rod,
23... Electric circuit, 24... Electric circuit, 25... Control circuit, 26... Timer, 27... Display, 28... Grain vat, 29... Grain outlet, 30... Grain flow path, a... Capacity measuring section, b... Moisture measurement section.

Claims (1)

[Scope of Claims] 1. Grain moisture measurement, characterized in that a weighing device is connected to a measuring container provided with a moisture sensor on the inner wall, and a grain conveying gutter equipped with a vibration device is provided in the upper part of the container. Device. 2. The grain moisture measuring device according to claim 1, wherein the measuring container is provided with a discharge valve at its bottom. 3. A patent claim in which an electric circuit provided in the weighing device and an electric circuit provided in the vibrating device are connected to supply grains of an arbitrary predetermined weight from the grain conveying gutter to the measuring container. The grain moisture measuring device according to item 1 or 2.