JPH0454900B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a moisture measuring method in which the moisture content of a high-moisture substance such as livestock manure containing solids is selectively measured from the outside of a container in a non-contact manner.

[Conventional technology]

Conventionally, known methods for measuring the moisture content of livestock manure include the constant temperature drying method (100°C, 24-hour method) and the infrared moisture measurement method.

[Problem to be solved by the invention]

The conventional measurement method described above has the problem that measurement is time-consuming and measurement values cannot be obtained instantaneously. In addition, the electrical resistance method and capacitance method, which are known as moisture measurement methods that easily measure the moisture content of low-moisture substances such as grains and pastures, cannot measure the moisture content of high-moisture substances such as livestock manure. When used, the measurement accuracy deteriorates, making it impractical. The present invention has been made to solve the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention winds a coil around the outer periphery of a non-conductive container containing a water-containing substance containing solid matter, and provides an upper electrode and a lower electrode, and connects both ends of the coil to an oscillation circuit. The upper electrode and the lower electrode are connected to the oscillation circuit via the switch, and by switching the switch, changes in the inductance of the coil due to the amount of water in the hydrated material and static between the electrodes can be controlled. This method is characterized by being able to measure moisture over a wide range by changing the capacitance.

[Effect]

By the above means, the moisture measuring method of the present invention
It is possible to selectively and accurately measure a water-containing substance containing solids such as livestock dung at high moisture levels and low moisture levels depending on its water content.

【Example】

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a cylindrical container with a bottom that stores high-moisture substances including solid matter such as livestock manure, and a coil 2 is wound around the outer circumference of this container 1 with enamelled wire or plating wire. is forming. Further, on the outer periphery of the container 1 below the coil 2, a pair of upper and lower electrodes 3 for measuring capacitance, which are conventionally known, are provided. A capacitor 4 is connected between one end 2a and the other end 2b of the coil 2, and the upper electrode 3a of the electrode 3.
An oscillation circuit 5 is connected to the upper electrode 3a.
The oscillation circuit 5 is provided with a changeover switch 6.
This switch 6 is configured to switch between a contact 6a connected to one end 2a of the coil 2 and a contact 6b connected to the lower electrode 3b of the electrode 3. Further, the output from the oscillation circuit 5 is output to an output terminal 7. In the moisture measuring device having such a configuration, when the livestock manure A to be measured is placed in the container 1 and the changeover switch 6 is connected to the contact 6a, the inductance of the coil 2 changes and the feces are connected to the terminal via the oscillation circuit 5. 7
This output is used to detect the amount of moisture in the livestock manure A, and specifically, it is interpreted as a change in the resonance frequency. In this case, since the resonant frequency varies depending on the shape of the container 1 and the length of the coil, the relationship between the moisture content and the amount of change in the resonant frequency is corrected in advance before measurement. In addition, when the moisture content of the livestock manure A to be measured is low (for example, it is in the process of drying), by switching the changeover switch 6 to the contact 6b side, the capacitance similar to that of the conventional well-known method using the electrode 3 can be increased. Moisture measurement can be performed using the measurement method. In this way, by switching the changeover switch 6,
Since the coil 2 can measure high moisture and the electrode 3 can measure low moisture, it is possible to measure moisture over a wide range, and it is possible to measure input materials, mixed materials, and products at actual livestock farms and joint processing facilities. It becomes easy to measure the moisture content of materials, the capacity of livestock manure processing facilities can be accurately and easily grasped, and the operational management of the facilities is simplified.

【Effect of the invention】

As explained above, according to the moisture measuring method of the present invention, a coil is wound around the outer periphery of a non-conductive container containing a water-containing substance including solids, and an upper electrode and a lower electrode are provided. Both ends are connected in series to an oscillation circuit and a changeover switch, and the upper electrode and lower electrode are connected to the oscillation circuit via the switch, and by switching the changeover switch, the inductance of the coil changes depending on the amount of water in the hydrated substance. By changing the capacitance between the electrodes,
Since it is possible to measure moisture over a wide range, it is possible to selectively, easily and instantaneously measure the moisture in high moisture substances with a simple structure. Furthermore, since the structure and means are simple, it can be manufactured at low cost and easily adapted to existing systems.

[Brief explanation of the drawing]

The drawings are a perspective view and a circuit diagram of a moisture measuring device showing an embodiment of the present invention. 1... Container, 2... Coil, 3... Electrode, 4... Capacitor, 5... Oscillation circuit, 6... Selector switch, 7... Output terminal, A... Livestock manure.

Claims (1)

[Claims] 1.A coil is wound around the outer periphery of a non-conductive container containing a water-containing substance containing solids, and an upper electrode and a lower electrode are provided, both ends of the coil are connected in series to an oscillation circuit and a changeover switch, and the upper The electrode and the lower electrode are connected to the oscillation circuit via the above switch, and by switching the changeover switch, a wide range of changes can be made by changing the inductance of the coil depending on the amount of water in the water-containing substance and changing the capacitance between the electrodes. A moisture measurement method characterized by making it possible to measure moisture.