JPH0424438Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a grain sample that is sandwiched between a pair of rotating electrode rolls and detects the moisture content of the sample from an electrical signal caused by a change in the current flowing between the pair of electrode rolls. This invention relates to a moisture measuring device.

BACKGROUND ART A conventional grain moisture measuring device of this type is described in, for example, Japanese Utility Model Publication No. 56-41247, which will be described with reference to FIG. 1,1'
are a pair of electrode rolls 1 and 1' which face each other at a distance suitable for clamping the sample grain 2 and rotate in the direction of the arrow. And a pair of electrode rolls 1,
An electric signal based on the current flowing between the pair of electrode rolls 1 and 1' when the sample grain 2 is sandwiched between the electrode rolls 1 and 1';
For example, a pair of electrode rolls 1 and 1' are connected to a constant voltage power source with a resistor connected in series, and the moisture content of the sample grain is measured by the voltage across the resistor.

Problems that the invention aims to solve By the way, in such a conventional moisture measuring device, the distance between the pair of electrode rolls facing each other is constant, so the grain size of the sample grain is large and small. However, the forces applied to the sample grains were significantly different, which affected the detected electrical signals and reduced measurement accuracy.

Therefore, in order to improve the measurement accuracy of this type of grain moisture measuring device, it is necessary to always keep the force applied to the sample grain uniform between a pair of electrode rolls, and to adjust the detected moisture value based on changes in that force. It is important to correct the

Means for Solving the Problems The present invention is intended to solve the above-mentioned problems, and its contents will be explained below using FIGS. 1 to 3, which correspond to embodiments.

A sample grain is sandwiched between a pair of rotating electrode rolls 101, 101', and a pair of electrode rolls 101, 1
In the apparatus for detecting the moisture content of a sample grain from an electric signal caused by a change in current flowing between the electrode rolls 101 and 101', the pair of electrode rolls 101 and 101' can be freely displaced from a position with a small distance between them, where they do not touch each other, in a direction in which they are separated from each other. And a pair of electrode rolls 10
1, 101' are resiliently supported in the direction in which they approach each other. In addition, a pair of electrode rolls 10
A detector 105 is provided to measure the force that the displaceable electrode roll 101' receives when the sample grains are held between the sample grains 1 and 101', and the moisture detection value is corrected using the force detected by the detector 105. has been done.

Function The sample grain whose moisture content is to be measured is placed between a pair of electrode rolls 1
During this process, an electrical signal due to a change in the current flowing through the sample grain between the pair of electrode rolls 101, 101' is detected, and the moisture content of the sample grain is measured from the electrical signal. be done. And a pair of electrode rolls 101, 10
1' is freely displaceable in the direction away from a small interval position where they do not contact each other, and is elastically supported in the direction in which they approach each other, so that regardless of the grain size of the sample grain, the pair of electrode rolls 10
The sample grain, which is held between The moisture content of can be measured with high precision.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

101 and 101' are a pair of electrode rolls,
One of the electrode rolls 101 is provided at a fixed position, and the other electrode roll 101' is supported so as to be freely displaceable by t' in a direction away from each other from a position t at a small distance where they do not contact each other. There is. The displaceable electrode roll 101' is elastically supported by a compression spring 102 in a direction toward the electrode roll 101. 1
03 is a displacement boss of the electrode roll 101', 104 is a support member for the compression spring 102, and a detector (strain gauge, etc.) 105 is attached to this support member 104 to detect the force applied to the compression spring 102. . The pair of electrode rolls 101, 101' are each rotated in the direction of the arrow. As shown in FIG. 2, the pair of electrode rolls 101 and 101' are connected to a constant voltage power source 106 with a resistor 107 in series, so that the voltage e across the resistor 107 can be detected. There is. Further, the detector 105 constitutes a bridge circuit 109 connected to a constant voltage power source 108, and is configured to detect the force applied to the electrode roll 101' via the compression spring 102 as an electric signal. Reference numeral 110 denotes an amplifier circuit, and 111 denotes a moisture detection circuit. Therefore, the detected moisture value is detected as a value corrected by the force applied to the electrode roll 101'. Note that an outside temperature signal may be input to the moisture detection circuit 111, and correction may also be performed based on the signal. 11
2 shows the sample grain.

In the grain moisture measuring device of this example,
Now, the sample grain 112 is connected to a pair of electrode rolls 101,
101', the sample grain 112
is sandwiched between the pair of electrode rolls 101 and 101' by rotation, and then falls downward. While the sample grain 112 is being sandwiched between the pair of electrode rolls 101, 101', a voltage is generated across the resistor 107 due to the current flowing between the pair of electrode rolls 101, 101' through the sample grain 112. e is input to the moisture detection circuit 111, and the moisture content of the sample grain 112 is measured. The measured moisture value is corrected by the force applied to the electrode roll 101' detected by the detector 105, so that the sample grain 112 sandwiched between the pair of electrode rolls 101, 101' Coupled with the fact that the compression spring 102 receives a substantially constant force as shown in FIG. 3, measurements can be made with high precision regardless of the size of the particle shape.

That is, as shown in FIG.
2 is crushed by l-l' in the process of passing between the pair of electrode rolls 101 and 101', but the force applied to the sample grain 112 during that time draws a gentle curve a, and is detected accordingly. The voltage e becomes approximately uniform. In the moisture detection circuit 111, the change in force is inputted from the detector 105, so that the detected moisture value is corrected. Note that, as in the conventional case, a pair of electrode rolls 101, 10
If the facing interval of 1' is constant, sample grain 1
The force a' that 12 receives changes greatly, and the detected voltage e' also exhibits a large peak accordingly.

Effects of the invention In short, since the present invention is configured as described above, the force applied to the sample grain between the pair of electrode rolls 101, 101' is always kept uniform, and the detected moisture value is adjusted according to the change in the force. This has the effect of significantly improving the accuracy of moisture measurement.

[Brief explanation of the drawing]

The drawings show an embodiment of the moisture measuring device according to the present invention, in which FIG. 1 is a schematic front view of the device, FIG. 2 is a circuit diagram of the main part of the device, and FIG. 3 is an explanatory diagram of the operation. FIG. 4 is an explanatory diagram of a conventional example. 101, 101'...Pair of electrode rolls, 10
2... Compression spring, 105... Force detector, 106
... Constant voltage power supply, 111 ... Moisture detection circuit, 11
2... Sample grain, a... Force applied to the sample grain, e
...Detected voltage.

Claims (1)

[Scope of utility model registration request] A sample grain is sandwiched between a pair of rotating electrode rolls, and the moisture content of the sample grain is detected from an electric signal caused by a change in the current flowing between the pair of electrode rolls, in which the pair of electrode rolls can be freely displaced in the direction of separating them from each other. The electrode rolls are elastically supported in the direction in which they approach each other, and a detector is provided to measure the force exerted on the movable electrode rolls when the sample grain is held between them, and the detected moisture value is corrected using the force detected by this detector. A grain moisture measuring device characterized by being configured as follows.