JP7413909B2 - Moisture meter - Google Patents

Description

The present invention relates to a moisture meter capable of measuring the moisture content of grains.

Traditionally, harvested grains such as paddy and soybeans have to be dried using a dryer to maintain a predetermined moisture content, and these dryers use a moisture meter to measure the moisture content of the grains. Dry conditions are managed by periodically measuring the values.

The above-mentioned moisture meter generally measures the current value that flows when grains are crushed with a pair of electrode rolls, and calculates the water content value from that value. Therefore, if the grain size changes, the measured value will change significantly, so when changing the grain to be dried in a dryer to a different type of grain with a different grain size, prepare a corresponding moisture meter for each type. However, this method is complicated and requires high cost measurements.

In order to cope with this, for example, the moisture meter disclosed in Patent Document 1 is capable of measuring the moisture content of different types of grains having different sizes. The moisture meter includes a pair of electrode rolls arranged in parallel in the radial direction of the rolls, in which a first rotating part for crushing small-diameter grains and a second rotating part for crushing large-diameter grains are arranged side by side in the rotational axis direction. A grain guide portion is disposed above both electrode rolls to guide grains between both electrode rolls. The position of the grain guide part can be switched along the rotation axis of the electrode roll, and by switching the position to one side, small-diameter grains can be measured in both first rotating parts. On the other hand, by switching the position to the other side, large-diameter grains can be measured in both second rotating parts.

JP 2018-36077 Publication

However, in the case of Patent Document 1, in order to switch between the measurement of small-diameter grains and the measurement of large-diameter grains, it is necessary to provide the device with a grain guide part that changes the path of grains to both electrode rolls. There was a problem in that the structure became complicated and the cost of parts and assembly increased. Furthermore, when switching the measurement to another type of grain having a different size, the operator has to switch the position of the grain guide portion, which is a problem in that the work is complicated.

The present invention has been made in view of the above, and its purpose is to be able to measure the moisture content of different types of grains with different sizes, and to eliminate the need for measurement work by an operator. To provide a moisture meter that is simple, has a simple structure, and is low cost.

In order to achieve the above object, the present invention provides a region for crushing small-diameter grains and a region for crushing large-diameter grains in order in the circumferential direction on the outer peripheral surface of an electrode roll, and It is characterized in that a crushing recess capable of accommodating the large-diameter grains is provided in the region where the grains are crushed.

Specifically, first and second electrode rolls are arranged in parallel in the roll radial direction so that their rotation axes extend in the same horizontal direction, and voltage, current, and resistance between the first and second electrode rolls are determined. and a detection unit capable of detecting at least one value, the voltage, current and The following measures were taken for a moisture meter configured such that the detection section detects at least one value of resistance and converts the moisture content value of the grain from that value.

That is, in the first invention, the outer circumferential surface of the first electrode roll includes a first region for crushing small-diameter grains and a second region for crushing large-diameter grains having a larger grain size than the small-diameter grains. and one or more of each are set so as to be lined up in order in the circumferential direction, and the second region is opened radially outward and when the large-diameter grain is accommodated, a part of the large-diameter grain is opened. A crushing recess configured to protrude from the crushing recess is formed , and a protrusion projecting radially outward is formed at the bottom of the crushing recess .

In a second invention, in the first invention, the crushing recesses are provided with a plurality of types having different bottom depths so as to be able to accommodate two or more types of large-diameter grains having different sizes. It is characterized by

A third invention is characterized in that in the first or second invention, the dimension of each of the crushing recesses in the direction of the rotation axis is set to a dimension corresponding to the grain size of the large-diameter grain. do.

In a fourth invention, in any one of the first to third inventions, a plurality of the crushing recesses are formed around the rotation axis.

In a fifth invention, in any one of the first to fourth inventions, the crushing recess has a circumferentially symmetrical shape when viewed from the rotation axis direction.

A sixth aspect of the invention is characterized in that, in the first aspect, the protrusion has a mountain-shaped cross section with a sharp tip and a pair of inclined surfaces that gradually approach the circumferential direction as they go radially outward. do.

In the first invention, when the small-diameter grains reach between both electrode rolls, they are crushed between the first electrode roll and the second electrode roll in the first region, so that the small-diameter grains are detected by the detection unit at the time of crushing. The water content value of small-diameter grains can be obtained by converting the value of at least one of current, voltage, and resistance.
If a small-diameter grain enters the crushing recess, the small-diameter grain will not be sandwiched between the second electrode roll, and the small-diameter grain will not be crushed and will not be crushed between the first and second electrode rolls. After passing through the gap, it falls below the first electrode roll and the second electrode roll.
On the other hand, when the large-diameter grains reach between both electrode rolls and are located in the first area of the first electrode roll, they do not enter between the first and second electrode rolls and are placed between the first and second electrode rolls. When the crushing recess reaches the position corresponding to the large-diameter grain, the large-diameter grain is accommodated in the crushing recess and is sandwiched between the second electrode roll and the second electrode roll. Since the large-diameter grains are crushed by crushing, the water content value of the large-diameter grains can be calculated from at least one of the values of current, voltage, and resistance detected by the detection unit during crushing.
In this way, even if small-diameter grains and large-diameter grains reach the same position between both electrode rolls, respective water content values can be obtained, so the structure of switching the grain path as in Patent Document 1 is used in the apparatus. There is no need to provide a moisture meter with a simple structure and low cost.
In addition, when switching measurement to another type of grain with a different size, the operator does not have to switch the grain route as in Patent Document 1, so the measurement work for the operator can be simplified. can do.
Furthermore, when the large-diameter grains accommodated in the crushing recesses are sandwiched between the outer circumferential surface of the second electrode roll, stress is concentrated on the contact portions of the projections with the large-diameter grains.
Therefore, the large-diameter grains are more likely to break in the crushing recesses, and there is also the effect that incorrect measurement of the moisture content in the large-diameter grains can be prevented.

In the second invention, it is possible to crush three or more different types of grains having different sizes between the first region of the first electrode roll and the plurality of different types of crushing recesses. Therefore, it is now possible to obtain moisture content values for three or more different types of grains with different sizes, and there is no need to replace the moisture meter every time you measure different types of grains with different sizes. Since there is no need to use the device, it is possible to keep costs low and to reduce the amount of effort required by the operator when handling the device.

In the third invention, since two or more large-diameter grains are not accommodated in each crushing recess side by side in the direction of the rotation axis, it is possible to simultaneously crush two large-diameter grains in each crushing recess. Therefore, it is possible to prevent abnormal values from occurring in the detection unit due to crushing two large-diameter grains at the same time. Moreover, since the area occupied by all the crushing recesses on the outer peripheral surface of the first electrode roll is minimized, the area of the first region that can be set on the outer peripheral surface of the first electrode roll is maximized. Therefore, when measuring small-diameter grains using a moisture meter, it is possible to efficiently measure the moisture content of the small-diameter grains.

In the fourth invention, since the number of times the large-diameter grain is measured per rotation of the first electrode roll increases, the water content value of the large-diameter grain can be efficiently measured.

In the fifth invention, when attaching the first electrode roll to the device, specifically, when assembling the device at a factory, or after removing the first electrode roll from the device for maintenance, the first electrode roll is attached to the device again. When installing, even if the mounting direction is reversed from the normal setting, the shape of the crushing recess viewed from the rotation axis direction will be the same as the normal setting. Therefore, even if the device is operated, large-diameter grains can be crushed in the crushing recess, so there is no need to stop the device and reinstall the first electrode roll, making it easier for the operator to handle. It can be made into a device.

In the sixth invention, since the tips of the protrusions are sharp, large stress is concentrated on the contact portions of the large diameter grains sandwiched between the protrusions and the outer peripheral surface of the second electrode roll.
Therefore, the large-diameter grains are reliably cracked within the crushing recesses, and the water content value of the large-diameter grains can be reliably obtained.

FIG. 1 is a perspective view of a moisture meter according to an embodiment of the present invention. 1 is a front view of the inside of a moisture meter according to an embodiment of the present invention. FIG. FIG. 3 is a view taken along arrow A in FIG. 2; FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, showing a state immediately before crushing small-diameter grains. FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, showing a state immediately before crushing large-diameter grains.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the following description of preferred embodiments is essentially only an example.

1 and 2 show a moisture meter 1 according to an embodiment of the present invention. The moisture meter 1 is a device used by being attached to a grain flow path through which grains 10 flow down in a circulating dryer that circulates and dries harvested grains such as rice and soybeans, and has a storage space inside. The main body case 2 has a substantially rectangular parallelepiped shape and has a diameter S1.

In addition, in the embodiment of the present invention, grains 10 such as paddy or wheat having a grain size in the range of 2 mm or more and less than 5 mm are referred to as small diameter grains 10A, and grains such as soybean grains having a grain size in the range of 5 mm or more and 10 mm or less 10 will be referred to as large-diameter grain 10B (see FIGS. 4 and 5).

A window (not shown) communicating with the storage space S1 is provided at approximately the center of the front surface of the main body case 2, and the window is covered with a transparent cover 2a having a rectangular plate shape.

A rectangular grain inlet 2b is formed approximately in the center of one side of the main body case 2, and the grain inlet 2b accommodates the grains 10 flowing down the grain flow passage in the circulation dryer. It is designed to be introduced into space S1.

As shown in FIG. 2, in the center of one side in the width direction of the storage space S1 of the main body case 2, each grain 10 introduced into the storage space S1 from the grain introduction port 2b is rotated at a predetermined interval. A conveying feeder 3 is provided, and the feeder 3 supplies grains 10 one by one to the downstream side of the apparatus via a shooter 3a extending diagonally downward.

A measurement unit 4 is disposed in the housing space S1 of the main body case 2 in a portion extending from the center to the bottom on the other side in the width direction.

The measurement unit 4 includes a first electrode roll 5 and a second electrode roll 6, which are arranged in parallel in the roll radial direction obliquely below the shooter 3a so that the rotation axes C1 and C2 extend in the same horizontal direction, and A drive motor 7 disposed above the second electrode rolls 5, 6, a gear box 8 connecting the first and second electrode rolls 5, 6 and the drive motor 7, and the first and second electrode rolls 5. . It is designed to rotate.

The first electrode roll 5 is made of a metal material and is located diagonally above the second electrode roll 6 on the side away from the feeder 3 .

As shown in FIG. 3, the first electrode roll 5 includes a thick disc-shaped roll main body 5a, and a pair of thin discs that are rotatably attached to both sides of the roll main body 5a in the direction of the rotation axis C1. The outer diameter of the disc plate 5b is set to be slightly larger than the outer diameter of the roll body 5a.

The roll main body 5a includes a first rotating part 51 on one half in the direction of the rotation axis C1, and a second rotating part 52 on the other half in the direction of the rotation axis C1.

Three crushing recesses 53 (second region) that open radially outward are formed on the outer circumferential surface of the first rotating part 51 at equal intervals around the rotation axis C1, and between each crushing recess 53 , three curved surface portions 54 (first regions) that are knurled are provided.

That is, the crushing recess 53 and the curved surface part 54 are set on the outer circumferential surface of the first rotating part 51 so as to be arranged in order in the circumferential direction.

The crushing recess 53 is closed on both sides in the direction of the rotation axis C1 by one disk plate 5b and the second rotating part 52, and its dimension in the direction of the rotation axis C1 is equal to the grain diameter of the large-diameter grain 10B. It has dimensions that correspond to

As shown in FIGS. 4 and 5, the crushing recess 53 has a circumferentially symmetrical shape when viewed from the direction of the rotation axis C1, and has a protrusion 53a projecting outward in the radial direction at its bottom. It is formed.

The protrusion 53a has a sharp tip and a mountain-shaped cross section with a pair of inclined surfaces 53b that gradually approach the circumferential direction toward the outside in the radial direction. It is in a position where it will not jump out.

That is, the crushing recess 53 has a W-shape when viewed in the direction of the rotation axis C1.

When the large-diameter grains 10B are accommodated in the crushing recess 53, a portion of the large-diameter grains 10B protrudes from the opening of the crushing recess 53 to the outside in the radial direction of the first rotating part 51. There is.

On the other hand, when the small-diameter grains 10A are accommodated in the crushing recess 53, the small-diameter grains 10A are prevented from protruding from the opening of the crushing recess 53 to the outside in the radial direction of the first rotating part 51.

As shown in FIG. 3, three crushing recesses 53 and three curved surface portions 54 are set on the outer circumferential surface of the second rotating portion 52 so as to be lined up in order in the circumferential direction, similarly to the first rotating portion 51. , each of the crushing recesses 53 in the second rotating part 52 is at an intermediate position between the crushing recesses 53 of the first rotating part 51 when viewed from the direction of the rotation axis C1.

That is, the crushing recesses 53 provided in the first electrode roll 5 are alternately staggered on one side and the other side in the direction of the rotation axis C1 in the circumferential direction of the first electrode roll 5. ing.

The crushing recess 53 of the second rotating part 52 is closed on both sides in the direction of the rotational axis C1 by the other disk plate 5b and the first rotating part 51, and the dimension in the direction of the rotational axis C1 is a large diameter. The size corresponds to the grain size of the grain 10B.

The second electrode roll 6 is located diagonally below the first electrode roll 5 on the feeder 3 side, and has a knurling process on its outer peripheral surface.

The dimensions of the second electrode roll 6 in the rotation axis C1 direction are approximately the same as those of the first electrode roll 5, while the outer diameter of the second electrode roll 6 is set larger than the outer diameter of the first electrode roll 5. There is.

At a position on the opposite side of the first electrode roll 5 from the feeder 3, as shown in FIG. 2, a first scraper 11a and a first brush 12a are arranged at a predetermined interval in order from the upstream side in the rotational direction. The tips of the first scraper 11a and the first brush 12a are configured to come into sliding contact with the outer circumferential surface of the first electrode roll 5 in a rotating state to clean the outer circumferential surface of the first electrode roll 5.

Further, below the second electrode roll 6, a second scraper 11b and a second brush 12b are arranged at a predetermined interval in order from the upstream side in the rotational direction, and the second scraper 11b and the second brush 12b , each tip is in sliding contact with the outer circumferential surface of the second electrode roll 6 in a rotating state to clean the outer circumferential surface of the second electrode roll 6.

The control panel 9 has a detection part 9a that can detect the value of the current flowing between the first electrode roll 5 and the second electrode roll 6. The value of the current that flows between the first electrode roll 5 and the second electrode roll 6 when they are sandwiched and crushed while passing between the first electrode roll 5 and the second electrode roll 6 that rotate in opposite directions to each other. At the same time, the water content value of the grain 10 is calculated and obtained from the current value.

Further, the control panel 9 controls the control panel 9 when the grains 10 are caught between the first electrode roll 5 and the second electrode roll 6 and a load exceeding a predetermined value is applied to the drive motor 7 that rotates the first electrode roll 5 and the second electrode roll 6. The first electrode roll 5 and the second electrode roll 6 are each reversely rotated via the drive motor 7 to prevent the grains 10 caught between the first electrode roll 5 and the second electrode roll 6 from being crushed. It is designed to be dropped below the accommodation space S1.

Next, the measurement of the moisture content of the small diameter grains 10A using the moisture meter 1 will be described in detail.

When the small-diameter grains 10A are dried in the circulation dryer, the small-diameter grains 10A flowing downward in the grain passing passage flow from the grain introduction port 2b of the main body case 2 to the storage space S1 inside the main body case 2. introduced in small quantities.

Each small-diameter grain 10A introduced into the storage space S1 is sequentially transferred at a predetermined interval while being hooked on a part of the outer peripheral surface of the feeder 3 rotating in the R1 direction, and is transported one by one to the downstream side of the device via the shooter 3a. fed to the side.

The small-diameter grains 10A that have passed through the shooter 3a are placed in front of the first electrode roll 5 that rotates in the R2 direction and the second electrode roll 6 that rotates in the R3 direction. Then, the small-diameter grains 10A reach the outer peripheral surface of the second electrode roll 6, and while being placed on the outer peripheral surface of the second electrode roll 6, the small-diameter grains 10A are transferred to the first electrode by the rotational movement of the second electrode roll 6. It reaches between the roll 5 and the second electrode roll 6.

Then, as shown in FIG. 4, the small diameter grains 10A are crushed between the curved surface portion 54 of the first electrode roll 5 and the second electrode roll 6, so that the small diameter grains 10A are detected by the detection unit 9a during crushing. The water content value of the small diameter grain 10A is obtained by converting the current value.

If the small-diameter grains 10A enter each of the crushing recesses 53 of the first electrode roll 5, the small-diameter grains 10A are not sandwiched between the first electrode roll 5 and the second electrode roll 6, so the small-diameter grains 10A are The grains 10A pass between the first electrode roll 5 and the second electrode roll 6 without being crushed, and then fall below the first electrode roll 5 and the second electrode roll 6.

Next, the measurement of the moisture content of the large-diameter grains 10B using the moisture meter 1 will be described in detail.

When the large-diameter grains 10B are dried in the circulation dryer, the large-diameter grains 10B flowing downward in the grain passage are stored inside the main body case 2 from the grain inlet 2b of the main body case 2. It is introduced into the space S1 little by little.

Each large-diameter grain 10B introduced into the storage space S1 is sequentially transferred at a predetermined interval while being hooked on a part of the outer peripheral surface of the feeder 3 which is rotating in the R1 direction, and is delivered to the device one by one via the shooter 3a. It is supplied to the downstream side.

The large-diameter grains 10B that have passed through the shooter 3a are thrown into the space between the first electrode roll 5 and the second electrode roll 6. Then, the large-diameter grains 10B reach the outer circumferential surface of the second electrode roll 6, and while being placed on the outer circumferential surface of the second electrode roll 6, the large-diameter grains 10B are transferred to the first It reaches between the electrode roll 5 and the second electrode roll 6.

Then, when the large-diameter grain 10B is located on the curved surface portion 54 of the first electrode roll 5, it does not enter between the first electrode roll 5 and the second electrode roll 6, and the first electrode roll 5 and the second electrode roll When the crushing recess 53 reaches the position corresponding to the large-diameter grain 10B while remaining in the position before entering between the rolls 6, the large-diameter grain 10B is accommodated in the crushing recess 53 and the second electrode roll Since the large-diameter grains 10B are crushed by being sandwiched between them, the water content value of the large-diameter grains 10B can be obtained by converting the current value detected by the detection unit 9a during crushing.

As described above, according to the embodiment of the present invention, even if the small-diameter grains 10A and the large-diameter grains 10B reach the same position between the first electrode roll 5 and the second electrode roll 6, respective water content values can be obtained. Therefore, there is no need to provide the apparatus with a structure for switching the route of the grains 10 as in Patent Document 1, and the moisture meter 1 can have a simple structure and low cost.

Furthermore, when switching between measurement of small-diameter grains 10A and large-diameter grains 10B, which are different types of different sizes, an operator can distinguish between small-diameter grains 10A and large-diameter grains 10B, as in Patent Document 1. Since there is no need to switch between different routes, the measurement work for the operator can be simplified.

In addition, since the dimension of the crushing recess 53 in the direction of the rotation axis C1 corresponds to the grain size of the large-diameter grain 10B, two or more large-diameter grains 10B are rotated in the crushing recess 53. They are not housed side by side in the axis C1 direction. Therefore, two large-diameter grains 10B are not crushed at the same time in each crushing recess 53, and an abnormal value in the detection part 9a caused by crushing two large-diameter grains 10B at the same time is prevented. Can be done.

In addition, by making the dimension of each crushing recess 53 in the rotation axis C1 direction a dimension corresponding to the grain size of the large-diameter grain 10B, the entire area occupied by the crushing recess 53 on the outer peripheral surface of the first electrode roll 5 becomes the minimum. Therefore, since the area of the curved surface portion 54 that can be set on the outer circumferential surface of the first electrode roll 5 is maximized, when measuring the small-diameter grains 10A with the moisture meter 1, it is possible to efficiently measure the moisture content of the small-diameter grains 10A. can be measured.

Further, since three crushing recesses 53 are provided in the circumferential direction of the first electrode roll 5, the number of times the large diameter grain 10B is measured per rotation of the first electrode roll 5 increases. Therefore, it is possible to efficiently measure the moisture content of the large-diameter grains 10B.

Moreover, since the crushing recess 53 has a symmetrical shape in the circumferential direction when viewed from the direction of the rotation axis C1, when the first electrode roll 5 is attached to the device, specifically, when assembling the device at a factory, Or, when the first electrode roll 5 is removed from the device for maintenance and then reattached to the device, even if the mounting direction is reversed from the normal setting, the rotation axis C1 direction of the crushing recess 53 The shape when viewed from is the same as the normal setting. Therefore, even if the device is operated, the large-diameter grains 10B can be crushed in the crushing recess 53, so there is no need to stop the device and reinstall the first electrode roll 5, and the operator The device can be easily handled.

In addition, since a protrusion 53a is provided at the bottom of the crushing recess 53, when the large diameter grain 10B accommodated in the crushing recess 53 is sandwiched between the outer peripheral surface of the second electrode roll 6 and , stress is concentrated on the contact portion of the protrusion 53a with the large-diameter grain 10B. Therefore, the large-diameter grains 10B are easily broken within the crushing recess 53, and it is possible to prevent incorrect measurement of the water content value in the large-diameter grains 10B.

Further, since the protrusion 53a has a mountain-shaped cross section and its tip is pointed, the protrusion 53a of the large-diameter grain 10B sandwiched between the crushing recess 53 and the outer circumferential surface of the second electrode roll 6 is in contact with the protrusion 53a. A large amount of stress will be concentrated at the contact area. Therefore, the large-diameter grains 10B are reliably cracked within the crushing recess 53, and the water content value of the large-diameter grains 10B can be reliably obtained.

In the embodiment of the present invention, the shapes of the crushing recesses 53 formed in the first electrode roll 5 are the same, but the shape is not limited to this, and for example, two or more types of large diameter grains having different sizes can be crushed. A configuration may be adopted in which a plurality of types of crushing recesses 53 having different bottom depths are provided so as to be able to accommodate the grains 10B, respectively.

Specifically, in the large-diameter grain 10B, the measurement is performed separately for the large-diameter grain 10B ₁ having a predetermined outer diameter dimension and the large-diameter grain 10B ₂ having a larger outer diameter than the large-diameter grain 10B ₁ . In such a case, a shallow crushing recess 53A (not shown) for the large diameter grain 10B ₁ and a deep crushing recess 53B (not shown) for the large diameter grain 10B ₂ are provided. They are provided on the outer circumferential surface of the first electrode roll ₅ , and when the bottom of the crushing recess 53B is accommodated in the crushing recess 53B, the large diameter grain _10B1 is placed in the crushing recess 53B. The first electrode roll 5 may be prepared at a position where it does not protrude outward from the opening in the radial direction of the first rotating part 51 or the second rotating part 52. Then, during measurement, the large-diameter grains _10B1 are accommodated in the crushing recess 53A and crushed, but when they enter the crushing recess 53B, they are not crushed and are separated by the first electrode roll 5 and the second electrode roll 6. It begins to pass between. Moreover, while the large-diameter grains 10B ₂ are accommodated in the crushing recess 53B and crushed during measurement, if they enter the crushing recess 53A, they are between the first electrode roll 5 and the second electrode roll 6. Therefore, the control panel 9 causes the first electrode roll 5 and the second electrode roll 6 to rotate in the opposite direction via the drive motor 7 so that they fall below the accommodation space S1 without being crushed. Become.

In this way, by providing a plurality of types of crushing recesses 53 with different bottom depths on the outer circumferential surface of the first electrode roll 5, three or more different types of grains with different sizes can be generated in combination with each curved surface part 54. 10 crushes are possible. Therefore, it is now possible to obtain the moisture content values of three or more different types of grains 10 with different sizes, and the moisture meter 1 is replaced every time different types of grains 10 with different sizes are measured. Since there is no need to do this, it is possible to keep costs low and to reduce the amount of effort required by the operator when handling the device.

Further, in the embodiment of the present invention, in the first electrode roll 5, the three crushing recesses 53 are formed at equal intervals around the rotation axis C1, but they may not be formed at equal intervals.

Further, in the embodiment of the present invention, six crushing recesses 53 are formed in the first electrode roll 5, but one to five crushing recesses 53 may be formed, or seven or more may be formed. .

Further, in the embodiment of the present invention, the crushing recesses 53 are formed in a staggered manner in the circumferential direction of the first electrode roll 5 on one side and the other side in the direction of the rotation axis C1. It does not have to be formed out of alignment.

Further, in the embodiment of the present invention, the crushing recess 53 has a circumferentially symmetrical shape when viewed from the direction of the rotation axis C1, but the crushing recess 53 does not have to have a circumferentially symmetrical shape.

Further, in the embodiment of the present invention, one protrusion 53a is formed at the bottom of the crushing recess 53, but two or more protrusions 53a may be formed at the bottom of the crushing recess 53.

Further, in the embodiment of the present invention, a knurled curved surface portion 54 is provided between each of the crushing recesses 53 in the first electrode roll 5, but knurling is not an essential requirement. If the small-diameter grains 10A can be crushed without knurling, the knurling process may not be performed.

Further, in the embodiment of the present invention, the protrusion 53a has a mountain-shaped cross section with a sharp tip, but stress can be concentrated on the large-diameter grain 10B when crushing the large-diameter grain 10B. If so, other shapes may be used.

Further, in the embodiment of the present invention, the detection unit 9a of the control panel 9 detects the current value flowing between the first electrode roll 5 and the second electrode roll 6, and converts the value of the water content of the grains 10. However, the present invention is not limited to this, and the detection unit 9a may detect the voltage value between the first electrode roll 5 and the second electrode roll 6 and convert it into the moisture content value of the grain 10. Alternatively, the value of the resistance between the first electrode roll 5 and the second electrode roll 6 may be detected and the water content value of the grain 10 may be obtained by converting the value of the resistance between the first electrode roll 5 and the second electrode roll 6. The moisture content value of the grain 10 may be obtained by detecting at least one value of .

INDUSTRIAL APPLICABILITY The present invention is suitable for a moisture meter capable of measuring the moisture content of grains dried in a dryer.

1 Moisture meter 5 First electrode roll 6 Second electrode roll 9a Detection part 10A Small diameter grain 10B Large diameter grain 53 Crushing recess (second area)
53a Projection 53b Slanted surface 54 Curved surface (first region)
C1 Rotation axis center

Claims (6)

First and second electrode rolls arranged in parallel in the roll radial direction so that the rotation axes extend in the same horizontal direction, and at least one value of voltage, current, and resistance between the first and second electrode rolls. Equipped with a detectable detection section,
The detection unit detects at least one value of voltage, current, and resistance during crushing of grains that are sandwiched and crushed while passing between the first and second electrode rolls that rotate in opposite directions; , a moisture meter configured to convert and obtain the moisture content value of the grain from the value,
On the outer peripheral surface of the first electrode roll, a first region for crushing small-diameter grains and a second region for crushing large-diameter grains having a larger grain size than the small-diameter grains are arranged in order in the circumferential direction. one or more of each are set,
A crushing recess is formed in the second region and is configured to open outward in the radial direction and allow a portion of the large-diameter grain to protrude from the opening when the large-diameter grain is accommodated; A moisture meter characterized in that a projection projecting radially outward is formed at the bottom of the crushing recess. In the moisture meter according to claim 1, the crushing recess is provided with a plurality of types having different depths at the bottom so that two or more types of the large-diameter grains having different sizes can be respectively accommodated. Moisture meter with special features. The moisture meter according to claim 1 or 2, wherein a dimension of each of the crushing recesses in the rotation axis direction is set to a dimension corresponding to a particle diameter of the large-diameter grain. . 4. The moisture meter according to claim 1, wherein a plurality of the crushing recesses are formed around the rotation axis. 5. The moisture meter according to claim 1, wherein the crushing recess has a circumferentially symmetrical shape when viewed from the rotation axis direction. 2. The moisture meter according to claim 1, wherein the protrusion has a mountain-shaped cross section with a sharp tip and a pair of inclined surfaces that gradually approach the circumferential direction as they go radially outward. Total.