JPS6346376B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a density stabilizing device in a powder moisture measuring device.

Conventional technology In conventional moisture meters that measure grain moisture using capacitance, 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. Moreover, even if the input amount is constant, the input density will not be constant due to differences in the friction coefficient of foreign grains, resulting in large errors in the measured moisture value, and the mechanism etc. will become complicated, leading to failures. However, it has some drawbacks such as frequent occurrence.

For example, Japanese Patent Application Laid-Open No. 55-31951 discloses an inflow device having a mechanism for adjusting the amount of paddy inflow from a circulating dryer, a device that measures a constant weight of paddy that has flowed in, and at the same time measures the moisture content of the paddy, A capacitive continuous type that is equipped with a discharge mechanism that discharges the paddy after measurement and a device that returns the discharged paddy to the dryer, and continuously measures the moisture content of the paddy by repeating the above series of operations. A paddy moisture content measuring device has been proposed, but this device only measures weight and moisture content.
There is a drawback that the density of the incoming paddy differs depending on the shape of the paddy, etc., which causes errors in the moisture content, and the paddy is fed during the moisture content measurement, making it impossible to obtain accurate measured values.

Furthermore, Japanese Patent Publication No. 39-13200 discloses that a certain amount of a sample is dropped from a certain height onto a receiving plate in a closed chamber, and then this receiving plate is vibrated for a certain period of time to diffuse and arrange the sample. An apparatus for measuring the moisture content of a diffused sample has been proposed, which measures the moisture content of the diffused sample using an electrode placed on the receiving plate or facing the receiving plate. Also, the influence of sample density on moisture content is not taken into consideration.
Furthermore, no consideration was given to the automatic opening/closing timing between the moisture content measuring device and the opening/closing bottom of the container.

Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks, vibrates a container for measuring the moisture content of powder and granules, eliminates the density difference of the powder and granules therein, and measures the density value. Therefore, the measured value detected by the moisture sensor is corrected, and furthermore, when the moisture sensor is measuring moisture, the supply of powder to the measurement unit and the vibration of the moisture measurement container are stopped, thereby preventing errors due to density unevenness. In addition to ensuring accurate moisture values through automatic operation, the density stabilization device of the powder moisture measuring device improves measurement performance by automatically performing the operation. The purpose is to provide

Means for Solving the Problems The density stabilizing device of the powder moisture measuring device of the first invention of the present application has a moisture sensor installed on the inner wall and a vibrator attached to the moisture measuring container, which is provided with a discharge valve at the bottom. It is connected to a weighing device, and a powder supply device is installed above it, and based on the signal from the timer, the weight value for a fixed volume of powder and granule is measured to obtain the density of the powder and granule. A control circuit is provided to stop the supplying device and the vibrator and to operate the weighing device and the moisture sensor, and a correction circuit that corrects the signal from the moisture sensor according to the density of the powder or granular material. The device has a configuration characterized in that the device and a moisture sensor are connected.

Further, the density stabilizing device of the powder moisture measuring device according to the second invention includes a moisture measuring container provided with a moisture sensor on the inner wall and a discharge valve at the bottom, and a vibrator and a weighing device connected to the container. A powder supply device is installed above the container, and a volume measuring device is installed in the container so that the density of the powder can be obtained by measuring the volume for a constant weight of the powder. A control circuit is provided to stop the supply device and the vibrator when the body has flowed into the container, and to operate the volume measuring device and the moisture sensor, and to adjust the signal from the moisture sensor depending on the density of the granular material. The volume measuring device and the moisture sensor are connected to a correction circuit for correction.

Embodiments The present invention will be described with reference to embodiment figures. In Fig. 1, a machine frame 1 is formed with a grain feeding port 2 on one side of the upper part and a grain discharging port 3 on the lower part.
A fixing plate 4 is mounted on the upper side of the interior, and a grain conveying gutter 6 equipped with a vibrator 5 is placed on the fixing plate 4 to serve as a feeding device, and a weighing device 7 is fixed below the fixing plate 4. At the same time, a moisture measuring container 8 is connected to one side of the weighing device 7. In the moisture measuring container 8, a moisture sensor 18 is attached to the inner wall surface of a cylindrical body 17A having an open top, and an opening/closing discharge valve 19 provided at the bottom thereof is connected to an opening/closing actuating device 20. The moisture measuring container 8 is a cylindrical body 17A formed to have a predetermined volume.
The grains in the form of granules are supplied by flowing down from the gutter end of the upper conveying gutter 6, and the weight of the grains forming an angle of repose at the upper part is measured. 21 shaft part and opening/closing valve 1
9 are connected by an opening/closing link 22. Furthermore, a vibrator 32 is attached to the moisture measuring container 8 in order to vibrate the container itself and make the charging density of the grains supplied into the moisture measuring container 8 uniform and constant.

Each electric circuit 7', 5', 32' of the weighing device 7 and the vibrators 5, 32, and each electric circuit 1 of the opening/closing actuator 20 of the moisture sensor 18 and the opening/closing valve 19.
8' and 20' are connected to each other through a control circuit A, and supply the sample grains by flowing down from the gutter end of the conveying gutter 6 to the moisture measuring container 8 to obtain an arbitrary predetermined grain density. The moisture content of the grains is measured, and the grains whose moisture content has been measured are discharged via an on-off valve 19, and this moisture measurement action is configured to be repeated continuously.

In the above configuration, the sample grains flowing down from the grain tank 34 to the grain conveying gutter 6 via the grain flow path 36 are transferred from the gutter end of the grain conveying gutter 6 to the moisture measuring container 8 by the vibration action of the vibrator 5. It flows down and is supplied to the container 8 by the action of the vibrator 32.
The grains are uniformly introduced into the container (see Figure 1),
A grain layer with an angle of repose is formed in the upper part of the cylinder 17A. Immediately, the vibrators 5 and 32 are stopped by a stop signal from a timer provided in the control circuit A, and the flow of grains from the grain conveying gutter 6 to the container 8 is stopped. The moisture measuring container 8 fed to a certain volume is weighed to measure the grain weight, and the signal is sent to the control circuit A.
At the same time, the moisture sensor 18 measures the capacitance of the grains in the container 8 and inputs the signal to the control circuit A, which controls the measured moisture value to an arbitrary predetermined value. The density is corrected and the moisture value is displayed on a display provided in the container of control circuit A. For the grains whose moisture content has been measured, the solenoid 21 of the opening/closing actuator 20 is actuated by the end signal from the timer, and the opening/closing valve 19 is opened to discharge the grains, and then closed. Grain moisture measurements are carried out continuously.

FIG. 2 shows another embodiment of the present invention, in which a cylindrical body 17B is formed to have an arbitrary volume of the moisture measuring container 8.
When a predetermined weight of grains is measured in the cylinder 17B, the vibrators 5 and 32 are stopped and the grains are supplied from the grain conveying gutter 6. is stopped, and the volume relative to the weight is measured by a volume measuring device 23 attached to the wall of the cylindrical body.

The volume measuring device 23 is provided with a volume measuring device 24 such as a variable resistance attenuator, and the volume measuring device 24 performs measurement. Further, the opening/closing actuating device for the opening/closing valve 19 is provided with a rotary cam mechanism 25 and is configured to be opened/closed by joining or separating from the locking rod 26 of the opening/closing valve 19. In this case, the electric circuit operates in the same manner as the circuit described above by installing the volume measuring device 23 shown in FIG. 4 in place of the weighing device 7 shown in FIG. 3 and connecting it to the circuit. In addition to measuring in a stable state, the volume is reliably measured, the density is corrected according to the change in the grain volume, and the corrected accurate moisture value is automatically displayed on the display 30.

In FIG. 3, a sensor 18 consisting of a power supply CV converter B and each output side of a weighing device 7 are connected to the input side of a correction circuit 28, and the output side of the correction circuit 28 is connected to an amplifier 29 and a relay. The detection signal from the moisture sensor ₁₈ is connected to the display 30 through the contacts R1 of the moisture sensor 18, and the contact _R1 of the relay is closed after the vibrators 5 and 32 are stopped by the operation of the timer. The detection signal from the device 7 and the correction circuit 28 are compared with each other and are appropriately corrected by addition or subtraction.
The correction signal is amplified by the amplifier 29, transmitted, and displayed on the display 30.

In this embodiment, the weight of the grains flowing down from the gutter end of the conveying gutter 6 to the lower moisture measuring container 8 is measured by the weighing device 7, and when a predetermined weight is reached, the respective vibrators 5 are ,32
, the flow of grains from the grain conveying gutter 6 is stopped, and the sensor 18 immediately measures the grain moisture value in the cylinder 17B, and the volume measuring device 23 measures the volume. The detection signals are respectively input to the control circuit A, the measured moisture values are corrected to an arbitrary predetermined density, and accurate grain moisture values are simply and automatically displayed on the display.

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 According to the present invention, the container for measuring the moisture content of powder and granules is vibrated to eliminate the difference in density of the powder and granules therein, and the density of the powder and granules is measured, and the moisture sensor is detected based on the density value. In addition, during moisture measurement with the moisture sensor, the supply of powder to the measurement unit and the vibration of the moisture measurement container are stopped to prevent density irregularities, the shape of the powder, and foreign matter. In addition to ensuring accurate moisture values by preventing errors based on the presence or absence of moisture, the measurement performance is improved by automatically performing this operation, and the moisture content of powder and granular materials can always be measured with high precision. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side sectional view of the device, FIG. 2 is a side sectional view of another embodiment of the device, and FIGS. 3 and 4 both show the control circuit thereof. be. DESCRIPTION OF SYMBOLS 1... Machine frame, 2... Grain feeding port, 3... Grain discharging port, 4... Fixed plate, 5... Vibrator, 5'... Circuit of vibrator 5, 6... Grain conveyance gutter, 7... Weighing device, 7'... Weighing Device circuit, 8... Moisture measurement container, 17A, 1
7B...Cylinder body, 18...Moisture sensor, 18'...Moisture sensor circuit, 19...Opening/closing valve (discharge valve), 20
...opening/closing actuator, 20'...circuit of the opening/closing actuator,
21... Solenoid, 22... Opening/closing link, 23... Volume measuring device, 24... Volume measuring device, 25... Rotating cam mechanism, 26... Locking protrusion, 28... Correction circuit, 29
...Amplifier, 30...Display device, 31...Timer, 32
...vibrator, 34...grain tank, 36...grain flow path, A
...Control circuit, B...C-V converter.

Claims (1)

[Scope of Claims] 1 A vibrator and a weighing device are connected to a moisture measuring container which is provided with a moisture sensor on the inner wall and a discharge valve at the bottom, and a powder supply device is provided above the container. , so that the density of the powder or granule can be obtained by measuring the weight value for a constant volume of the powder or granule.
A control circuit is provided that stops the supply device and the vibrator based on a signal from a timer, and operates the weighing device and the moisture sensor, and corrects the signal from the moisture sensor based on the density of the powder or granular material. A density stabilizing device for a powder moisture measuring device, characterized in that the weighing device and the moisture sensor are connected to a correction circuit. 2 A vibrator and a weighing device are connected to a moisture measuring container that is equipped with a moisture sensor on the inner wall and a discharge valve at the bottom, and a powder supply device is installed above the container for measuring the moisture content. A volume measuring device is provided in the container so that the density of the granular material can be obtained by measuring the volume value for the body, and the supply device and the vibrator are stopped when a certain weight of the granular material has flowed into the container. and a control circuit for operating the volume measuring device and the moisture sensor;
A density stabilizing device for a granular material moisture measuring device, characterized in that the volume measuring device and the moisture sensor are connected to a correction circuit that corrects a signal from the moisture sensor according to the density of the granular material.