JPH049253B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to a pair of detection rolls that are opposed to each other and pivoted on a machine frame so as to maintain a predetermined distance between the rolls, which is narrower than the grain size of grains. The resistance of the current flowing between the pair of detection rolls through the crushed grains while supplying grains to the opposing space and crushing the grains by a pair of detection rolls. The present invention relates to an improvement in a grain moisture content measuring device that measures the moisture content of grains by detecting a value.

[Prior Art] As shown in FIG. 1, the above-mentioned grain moisture content measuring device uses a pair of detection rolls 1, 1 made of an electrically conductive metal material; Attach it to the formed support shafts 2, 2, and attach the support shafts 2, 2 to the
A pair of detection rolls 1 are attached to the machine frame a via an insulating material.
It is arranged and supported so that the width between the rolls of ₁ is somewhat narrower than the grain size of the grain G to be measured, and it is connected to the measurement circuit that measures the electrical resistance. . By rotating the support shafts 2, 2 in synchronism in the direction shown by the arrow in FIG. While crushing the supplied grains G,
The moisture content in the grain is measured by detecting the electrical resistance value of the current flowing between the detection rolls 1 and 1 through the crushed grains. Also, the support shafts 2, 2 supporting the detection rolls 1, 1
The terminals also serve as connection terminals for connecting the detection rolls 1, 1, which serve as electrodes, to a measurement circuit that detects electrical resistance, and if the pivot position of the rolls moves, the connection will be poor and the detected value will be inaccurate. Since it is assumed that
Its position is fixed and it is assembled and supported on the machine frame a.

[Problems to be Solved by the Invention] The moisture content measuring device of the above-mentioned form is applicable when the distance between the detection rolls 1 and ₁ shown in FIG. If it is set to 〓, when attempting to measure the moisture content of brown rice grains, which have a smaller grain size than these grains or barley grains, the detected value will become unstable due to poor crushing.

Also, from this, the pair of detection rolls 1, 1
The support shafts 2, 2 of are supported on the machine frame a so that the support positions of the support shafts 2, 2 are displaced, and by adjusting the displacement of the support shafts 2, 2, the distance between the rolls of the pair of detection rolls 1, 1 is adjusted. 〓l ₁ corresponds to the grain size of the target grain〓
If you switch to , a slight deviation in the position of the support shafts 2 and 2 will cause a large deviation in the measured value of the electrical resistance, so in the end, large-sized paddy/wheat grains will be The target moisture content measuring device and the moisture content measuring device for small grains such as brown rice grains will each be made as dedicated machines.

By the way, this moisture content measuring device is used to accurately control the operation of the grain dryer when drying grains in the grain dryer. Regarding drying, since the final purpose is to finish the brown rice to a specified moisture content for submission to the Food Agency, it is necessary to measure the moisture content with a wide distance between the rolls of the detection rolls that target rice grains. A moisture content measuring device with a narrow distance between the device and the detection roll for brown rice becomes necessary. For this reason, farmers who use a grain dryer to dry paddy must prepare these two moisture content measuring devices, which poses a large burden.

The present invention has been made to solve this problem, and includes a pair of opposing detection rolls 1, 1 with their respective support shafts 2, 2 fixed in position relative to the machine frame a. While being pivotally supported, the distance between the detection rolls 1 and 1 is a wide space suitable for measuring the moisture content of paddy grains and wheat grains, and a narrow space suitable for measuring the water content of brown rice grains. To provide a new moisture content measuring device that can accurately detect the moisture value of large-diameter paddy grains and wheat grains and the moisture value of small-diameter brown rice grains by switching to The purpose is to

[Means for Solving the Problems] In the present invention, as a means for achieving this object, a pair of detection rolls that are pivotally supported on the machine frame by separate support shafts are provided with The detection rolls are formed in such a way that one half has a large diameter and the other half has a small diameter, and the detection rolls are combined into a pair on the machine frame so that the large diameter sides of the detection rolls face each other, and the detection rolls are mounted on each support. The shaft is supported at a fixed pivot position, and the detection rolls are driven in synchronization, and the measurement circuit connected to the detection rolls has a large-diameter side and a large-diameter side of the detection rolls. The grain is characterized in that it is provided with a changeover switch that switches between a state in which the measuring circuit is turned on when they are opposite to each other and a state in which the measuring circuit is turned on when the small diameter side and the small diameter side of the detection rolls are opposed to each other. A device for measuring moisture content of grains is proposed.

[Example] Next, an example will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings are used for components having the same effect as those of the conventional means.

In FIG. 3, reference numerals 1 and 1 are detection rolls made of an electrically conductive metal material, each supported by one end of a support shaft 2, 2 made of an electrically conductive metal material; As shown in the figure, the detection rolls 1, 1 are supported on the machine frame a via an insulating material 3 in parallel on the left and right in a position where they are in different states, so that the detection rolls 1, 1 face each other at a predetermined interval. It is designed to do so. Drive gears 4, 4 are fitted onto the other end sides of these support shafts 2, 2 via insulating materials 40, 40, and these drive gears 4, 4 are shown in FIG. As shown in FIG.
As a result, the detection rolls 1, 1 are rotated in synchronism in the direction of arrow A in FIG.

Further, contact terminals 6 made of carbon brushes are connected to the support shafts 2, 2, respectively, and are connected to a measuring circuit installed in the machine frame a.
When the measurement circuit and the drive motor M circuit are on, when grains G, which are the material to be measured, are fed from the supply port 7 provided on the top side of the machine frame a, the grains G are transferred to the detection rolls 1, 1. The detection roll 1 and the detection roll 1, which become electrodes by being inserted between them, are electrically connected via the grain G, and the grain G is connected to the measurement circuit.
A current flows with an electrical resistance corresponding to the water content, and the electrical resistance value is detected by the measuring circuit, converted to water content, and displayed on the display section. These configurations are no different from conventional grain moisture content measuring devices of this type.

However, the above-mentioned detection rolls 1, 1 are
As shown in the figure, when supported on the support shafts 2, 2, the axis O of the detection rolls 1, 1 is eccentrically supported with respect to the axis P of the support shafts 2, 2, respectively. , and each eccentric detection roll 1,
The detecting rolls 1, 1 are supported on support shafts 2, 2 with their phases shifted in the circumferential direction by 180 degrees so that the long diameter sides of the radii from the center of rotation of the detecting rolls 1, 1 face each other. , one half side 1a in the circumferential direction of the circumferential surface thereof has a large diameter, the other half side 1b has a small diameter, and the one half side 1a having the large diameter and the one half side 1a are combined so as to face each other. be.

Further, as shown in FIG. 5, timing cams 8, 8 are mounted on the support shafts 2, 2, and the timing cams 8, 8 have a large diameter portion 8a on one half side in the circumferential direction and a small diameter portion 8b on the other half in the circumferential direction. 1 and 1 are respectively provided corresponding to the large diameter side and the small diameter side, and limit switches S ₁ and S ₂ are connected to these, respectively.

The limit switch _S1 is set to be turned on when the contact piece is pushed in, and the limit switch _S2 is set to be turned off when the contact piece is pushed in. These limit switches S ₁ ,
S ₂ is connected to the aforementioned measurement circuit via a separate switch S ₃ , which
By switching _S3 , the connection is alternately switched and connected to the measurement circuit.

As a result, when the limit switch S ₁ is connected to the measuring circuit and controlling the measuring circuit, one half 1a on the large diameter side of the detection rolls 1, 1,
The measuring circuit is turned on only during the half-turn when the rollers 1a face each other and perform the crushing action, and when the limit switch _S2 is connected to the measuring circuit and controlling the measuring circuit, the detection rolls 1 and 1 are turned on. The measuring circuit is turned on only during the half-circle when the other halves 1b, 1b on each smaller diameter side face each other and perform a crushing action.

6 and 7 show another embodiment of the detection rolls 1,1. The detection rolls 1, 1 are the sixth
As shown in the figure, when one half side 1a is formed to have a larger diameter side gradually increasing in diameter, and the other half side 1b is formed to be a smaller diameter side coaxial with the support shaft 2,
As shown in FIG. 7, a bulge is formed only on one half side 1a to form a large diameter side, and both one half side 1a, which is the large diameter side, and the other half side 1b, which is the small diameter side, are respectively It may be formed as appropriate, such as when it is formed coaxially with the support shaft 2.

Further, the detection rolls 1, 1 are driven by a drive motor M
It is desirable to provide a control switch in the circuit to control the motor so that it always stops at a fixed position. The aforementioned switches S ₁ and S ₂ may be used as this control switch.

[Function] The grain moisture content measuring device according to the present invention configured as described above functions as follows.

By operating the changeover switch _S3 , there is a state in which the detection operation is performed only when the large-diameter half sides 1a of the detection rolls 1, 1 face each other and crush grains, and a state in which the detection operation is performed only when the large diameter sides 1a of the detection rolls 1, The detection operation is switched to a state in which the detection operation is performed only when the other half sides 1b, which are the smaller diameter sides, face each other and crush the grains.

From this, when measuring the moisture content of brown rice while crushing it, the detection rolls 1, ₁ have one half side 1a of the large diameter and one half side 1a, which is the opposing distance 〓l 1 suitable for crushing brown rice. Set it so that it will perform a detection operation when it faces you. This makes it possible to accurately measure the moisture content of small diameter brown rice.

Next, when trying to measure the moisture content while crushing paddy grains and wheat grains, the distance between the opposing detection rolls 1 and 1 〓l ₂ is the interval that is suitable for crushing the paddy grains and wheat grains.
It is set in such a state that the detection operation is performed when the other half 1b of the small diameter is opposed to the other half 1b. This makes it possible to accurately measure the moisture content of large-diameter rice grains and wheat grains.

[Effects of the Invention] As explained above, the moisture content measuring device according to the present invention has a pair of opposing detection rolls 1, 1 with their supporting shafts 2, 2 fixed in position on the machine frame a. However, by operating the changeover switch _S3 , there is a state in which the detection operation is performed only when the large-diameter halves 1a, 1a of the pair of opposing detection rolls 1, 1 face each other, and a state in which the detection operation is performed only when the large-diameter halves 1a, 1a of the pair of opposing detection rolls 1, 1 are opposed, and a state in which the detection operation is performed only when the large-diameter halves 1a, 1a of the pair of opposing detection rolls 1, 1 are opposed. Other half 1b, 1
Since the state is changed to a state in which the detection operation is performed only when the two faces are facing each other, by operating this changeover switch _S3 , it is possible to detect large diameter grains such as paddy grains without moving the position of the spindles 2, 2. It is possible to switch between a state where the distance between the rolls is narrow, which is suitable for measuring the moisture content, and a state where the distance between the rolls is wide, which is suitable for measuring the moisture content of small-diameter grains such as brown rice grains. Now, it is possible to accurately measure the moisture content of large-diameter grains (rice grains) and small-diameter grains (brown rice grains) with a single moisture content measuring device.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the conventional means, FIG. 3 is a longitudinal sectional front view of the grain moisture content measuring device according to the present invention, FIG. 4 is a longitudinal sectional side view of the same device, and FIG. 5 is the same device as above. FIG. 6 is a front view of the main part of another embodiment, and FIG. 7 is a front view of the main part of still another embodiment. Explanation of drawing symbols, 1...detection roll, 1a...
One half side, 1b...Other half side, a...Machine frame, 2...Spindle, 3...Insulating material, G...Grain, _l1 , _l2 ...Between rolls, M...Drive motor , m...output shaft, 4
... Drive gear, 40 ... Insulating material, 50 ... Conduction gear, 6 ... Contact terminal, 7 ... Supply port, 8 ... Timing cam, 8a ... Large diameter part, 8b ... Small diameter part,
S ₁ , S ₂ ... limit switch, S ₃ ... changeover switch.

Claims (1)

[Claims] 1 A pair of detection rolls 1 and 1 are supported on a machine frame a by separate support shafts 2 and 2, and one half side 1a of each circumferential surface thereof in the circumferential direction has a large diameter and the other half side 1b has a small diameter. The detection rolls 1, 1 are assembled into a pair on the machine frame a so that the large diameter sides of the detection rolls face each other, and the pivot positions of the respective support shafts 2, 2 are adjusted. The detection rolls 1, 1 are fixedly and pivotally supported, the detection rolls 1, 1 are driven in synchronization, and the measurement circuit connected to the detection rolls 1, 1 includes a large diameter side of the detection rolls 1, 1 and a large diameter side of the detection rolls 1, 1. A changeover switch _S3 is used to switch between turning on the measuring circuit when the two sides face each other and turning on the measuring circuit when the small diameter sides of the detection rolls 1 and 1 face each other. A grain moisture content measuring device characterized by comprising: