JPH0449575Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a grain moisture content measurement method that detects the moisture content by supplying and crushing grain between a pair of rotating electrode rolls and measuring the electrical resistance of the grain. Regarding equipment.

[Conventional technology]

In the drying process of grain, a grain moisture content measuring device is used to measure the moisture content of the grain in order to ascertain the degree of drying.

This grain moisture content measuring device is provided with a pair of rotating electrode rolls. Grain is fed between these electrode rolls and crushed. Thereafter, the water content of the grain is detected by measuring the electrical resistance that flows between the electrode rolls through the grain.

In this case, fan-shaped notches are formed in each electrode roll so as to face each other and span about 1/4 of the circumference. Therefore, during normal times, grains only flow down between these notches, but during measurement, the electrode roll rotates and grains are sampled in areas other than these notches.
The material is then crushed and its electrical resistance measured before being discharged. Therefore, there is an advantage that the operations of grain sampling, crushing, and resistance measurement can be performed continuously and automatically.

By the way, it is naturally desirable that these operations for detecting the moisture content be performed in a short time.

[Problem that the invention aims to solve]

However, simply increasing the rotational speed of the electrode rolls will not crush the grains sufficiently, resulting in a decrease in measurement accuracy, and there is also a limit to crushing a large amount of grains at once for the purpose of improving accuracy. It was hot.

In consideration of the above facts, the present invention aims to provide a grain moisture content measuring device that can automatically detect the moisture content of grain in a short period of time without impairing measurement accuracy.

[Means for solving problems]

The grain moisture content measuring device according to the present invention is a grain moisture content measuring device for crushing grains and measuring electrical resistance, and includes a pair of electrode rolls in which at least one of the electrode rolls is formed with a notch, and one of the electrode rolls has a notch. The rotational speed of the electrode roll is set to an integral multiple of 2 or more than the rotational speed of the other electrode roll, and the measurement is continuously carried out two or more integral times in one revolution of the other electrode roll.

[Effect]

In the grain moisture content measuring device configured as described above, each operation of sampling, crushing, measuring, and discharging is performed multiple times during one revolution of one electrode roll, that is, in one period of measurement process. Therefore, highly accurate moisture content detection can be performed in a short time.

Furthermore, since the rotational speeds of both electrode rolls are different, the degree of crushing of the grain is improved, and since the crushed samples are not mixed together, the measurement accuracy is further improved.

〔Example〕

Fig. 1 shows a grain moisture content measuring device 1 according to the present invention.
0 is shown, and FIG. 2 is a schematic cross-sectional view of the grain moisture content measuring device 10.

The grain moisture content measuring device 10 is provided with a pair of electrode rolls 12 and 13. These electrode rolls 12 and 13 are made of a conductive metal material, and are formed with a substantially disk-shaped measuring section 14 and a shaft section 16 that protrudes from the center of the measuring section 14 toward one side in the axial direction. There is.

The peripheral wall 18 of the measuring part 14 is knurled and further has a threaded groove 20 formed therein. Furthermore, a notch 22 is formed in the measuring portion 14 in a fan-shaped notch extending over approximately 1/4 of the circumference.
These electrode rolls 12 and 13 are inserted into a case 24 and supported so as to rotate around a shaft portion 16.

The case 24 is an insulating member in which a pair of through holes 26 for supporting the electrode rolls 12 and 13 are bored in the center.
The shaft portions 16 of the electrode rolls 12 and 13 are inserted into these through-holes 26, respectively, and are pivotally supported by the pair of shaft portions 16 via two front and rear ball bearings 28, respectively. In this case, the distance between the axes of the left and right through holes 26 is set so that the gap between the measurement parts 14 of the electrode rolls 12 and 13 has a width that is somewhat narrower than the grain size of the grain, and the grain that has entered can be crushed.

A conductive contact terminal 34 is provided between each ball bearing 28 for supporting the electrode rolls 12 and 13.
are arranged so that they are sandwiched. The contact terminal 34 is a substantially C-shaped thin plate with one end bent inward to form a contact piece 36. This contact piece 36
is adapted to come into contact with the shaft portion 16 of the electrode rolls 12 and 13. In addition, there is a connection terminal 3 in the middle part.
8 is formed and connected to the measurement circuit 39 via a lead wire.

An electrode gear 40 is attached to the tip of the shaft portion 16 of the electrode roll 12 which is pivotally supported by the case 24 by each ball bearing 28, and an electrode gear 41 is meshed with the tip of the shaft portion 16 of the electrode roll 13. combined. Therefore, as the electrode gear 40 and the electrode gear 41 rotate, the electrode rolls 12 and 13
begin to rotate opposite each other.

In this case, the number of teeth of the electrode gear 41 is
The number of teeth is preferably 1/2 or less, and in this embodiment, it is 1/2. Therefore, while the electrode gear 40 rotates once, the electrode gear 41
It is preferable to rotate more than this, preferably two or more rotations, and in this embodiment, the rotation is two rotations. Therefore, along with this, the rotational speed ratio of the electrode roll 12 and the electrode roll 13 is also 1:2.
It is becoming.

The connecting portions of the electrode gear 40 and the electrode gear 41 with each shaft portion 16 are made of an insulating material. Therefore, the electrode roll 12 and the electrode gear 40 and the electrode roll 13 and the electrode gear 41 remain non-conductive even after being combined and integrated.

A drive motor 42 is disposed near the electrode gear 40. A motor gear 44 is fixed to the output shaft of the drive motor 42. Furthermore, an intermediate gear 46 is disposed between the electrode gear 40 and the motor gear 44 and is supported by an intermediate shaft 48, meshing with both gears. Therefore, the driving force of the drive motor 42 is transmitted to the electrode gear 40 via the intermediate gear 46 and also to the electrode gear 41, and the electrode roll 12 and the electrode gear 41, which are integrated with the electrode gear 40, are The integrated electrode rolls 13 are rotated to face each other.

The grain moisture content measuring device 10 configured as described above is arranged at the lower end of the bucket conveyor 50 for conveying grains, and a portion of the scooped grains is fed into the bucket 51 in the bucket conveyor 50. ing.

Next, the operation of this embodiment will be explained.

3A to 3G are explanatory views of the operation of the electrode roll 12 and the electrode roll 13.

A part of the grain scooped up into the bucket 51 of the bucket conveyor 50 is always fed into the grain moisture content measuring device 10 following the path indicated by arrow A in FIG. When the grain moisture content measuring device 10 is in an inoperative state, the notches 22 of the measuring part 14 are stopped at positions facing each other as shown in FIG. It is sent back to the bucket conveyor 50 through.

Grain moisture content is measured by activating the grain moisture content measuring device 10 and rotating the electrode rolls 12 and 13 to the sampling position. That is, the driving motor 42 is activated, and its driving force is transmitted to the electrode gear 40 and the electrode gear 41 via the intermediate gear 46. Therefore, the electrode roll 12 integrated with the electrode gear 40 and the electrode roll 13 integrated with the electrode gear 41 rotate in the direction of arrow B in FIG. 3A around each shaft portion 16. In this case, the rotational speed of the electrode roll 12 and the rotational speed of the electrode roll 13 are 1:2, corresponding to the gear ratio of the electrode gear 40 and the electrode gear 41.

When the electrode roll 12 rotates at an angle of 45 degrees in the direction of arrow B from the state shown in FIG.
The grains that had been sent back to the bucket conveyor 50 through the gap between the notches 22 of FIG. The first sampling is performed.

The grain that has entered between the measuring parts 14 is crushed between the measuring parts 14 as the electrode rolls 12 and 13 rotate as shown in FIGS. 3B to 3C. Furthermore, as the grain is crushed, a measurement current is passed between the left and right electrode rolls 12 and 13 from the measurement circuit 39 via the contact terminals 34. In this case, since the rotational speeds of the electrode roll 12 and the electrode roll 13 are different, the friction is large and the degree of crushing is improved, so that accurate measurement can be performed. The measuring circuit 39 measures an electrical resistance value corresponding to the moisture content of the crushed grains interposed between the measuring parts 14, and further converts the electrical resistance value into a water content and displays it on a display part (not shown).

The crushing is performed until the notch 22 of the electrode roll 13 corresponds to the measurement part 14 of the electrode roll 12 as shown in FIG. It is discharged as the roll 13 rotates and is transferred to the bucket conveyor 50 again.
sent back to

When the electrode roll 12 and the electrode roll 13 are further rotated to the state shown in FIG. 3E, a second sampling of the sample is performed in the same manner as in the state shown in FIG. 3B. However, in this state, the electrode roll 12
has not yet made one revolution from the state shown in FIG. 3A. After that, from Figure 3E to Figure 3F,
That is, the sample is crushed until the notch 22 of the electrode roll 12 corresponds to the measurement part 14 of the electrode roll 13, and the sample is crushed and the electrical resistance is measured in the same manner as described above. In this case as well, since the rotational speeds of the electrode roll 12 and the electrode roll 13 are different, the degree of crushing is improved and accurate measurement is performed.

When the electrode rolls 12 and 13 further rotate to reach the initial state shown in FIG. 3G, the crushed grains are discharged and sent back to the bucket conveyor 50.

As described above, in this embodiment, during one rotation of the electrode roll 12, that is, in one cycle of the measurement process,
Each sampling, crushing, measuring and evacuation movement can be performed twice.

When the measurement is completed and the drive motor 42 stops,
The measuring section 14 stops at a position where the notches 22 face each other and waits for the next moisture content measurement.

In this embodiment, the notch 22 is provided in both the electrode roll 12 and the electrode roll 13, but the present invention is not limited to this, and the structure in which the notch 22 is provided only in the electrode roll 13 as shown in FIG. Good too. Further, the rotational speed of the electrode roll 12 and the rotational speed of the electrode roll 13 is not limited to 1:2, and may be any speed as long as the electrode roll 13 is faster than the electrode roll 12.

Further, in this embodiment, the shape of the notch 22 is fan-shaped, but the shape is not limited to this, and the notch 23 may have other shapes such as a crescent shape as shown in FIG.

[Effect of idea]

As explained above, the grain moisture content measuring device according to the present invention is a grain moisture content measuring device that crushes grains and measures the electrical resistance, and includes a pair of electrode rolls in which at least one of them has a notch. The rotational speed of the one electrode roll is an integral multiple of 2 or more than the rotational speed of the other electrode roll, and the measurement is carried out consecutively an integral number of 2 or more times in one rotation of the other electrode roll. Therefore, it has the excellent effect of automatically detecting the moisture content of grains in a short time without compromising measurement accuracy.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of essential parts of the grain moisture content measuring device according to the present invention, Fig. 2 is a sectional view of the same device, and Fig. 3 is a sectional view of the same device.
Figures A to 3G are front views showing the operation of the electrode roll, and Figures 4 and 5 are front views of electrode rolls according to other embodiments. 10... Grain moisture content measuring device, 12... Electrode roll, 13... Electrode roll, 14... Measuring section, 2
2... Notch, 40... Electrode gear, 41... Electrode gear.

Claims (1)

[Scope of utility model registration request] A grain moisture content measuring device for measuring electrical resistance by crushing grain, which has a pair of electrode rolls in which at least one of the electrode rolls is formed with a notch, and the rotation speed of the one electrode roll is equal to the rotation speed of the other electrode roll. A grain moisture content measuring device, characterized in that the measurement is made at an integral multiple of 2 or more of the speed, and the measurement is carried out continuously at the integral number of 2 or more times in one rotation of the other electrode roll.