JP3495844B2 - Milling machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain barrel having a grain inlet at one end and a grain outlet at the other end, and a fine grain rotary driven inside the grain barrel. Equipped with a grain roll,
The present invention relates to a so-called "friction type" grain refiner in which the grain roll has a stirring blade continuously provided in the rotation axis direction on the peripheral surface.

[0002]

2. Description of the Related Art This type of grain refiner feeds grains introduced from an introduction port between a grain barrel and a grain roll while rotating the grain roll in the grain barrel and agitating blades. It is agitated to remove the bran component on the surface by the frictional action between the grains, and then the grains are discharged from the discharge port, which is widely used for making brown rice into white rice.

By the way, grains, especially rice, have an elongated shape. For example, rice called Japonica cultivated in Japan has a dimensional ratio of width to length of 1.6-
It is about 2.4. Therefore, when the fine grain roll having the stirring blade is rotated, most of the rice grains between the fine grain roll and the fine grain cylinder are oriented such that the longitudinal axis thereof is parallel to the wall surface of the stirring blade. Then, because they are rubbed against each other in this state, sufficient friction action does not work at both ends in the longitudinal direction of the rice grain, and the bran component at both ends remains without being peeled off. It is a big problem that the embryo (a kind of bran component) at one end cannot be removed sufficiently.

Therefore, in Japanese Patent Laid-Open No. 64-15147, a slit hole 1 as shown in FIG.
No. 01 is formed, and the grain refiner in which the enlarged hole portion 102 is formed in a part of the slit hole 101 is proposed. That is, this grain refiner disturbs the flow of rice grains by changing the direction of the rice grains by inserting a part of the rice grains stirred in the grain refiner into the expansion hole 102, thereby changing the direction of the rice grains. A sufficient frictional action is exerted on both ends of the soybean so that the bran components at both ends are also peeled off.

[0005]

However, in the above-described conventional grain refiner, when a rice grain that is restricted by one end in the longitudinal direction being fitted into the enlarged hole portion 102 is collided with another rice grain that follows, an impact is generated. As a result, the rice grain fitted in the enlarged hole portion 102 may snap off. Then, since the broken pieces of rice grains are discharged to the outside of the grain-refining cylinder through the enlarged hole portion 102, the yield of the grain-refined rice is reduced.

Further, if the diameter of the enlarged hole portion 102 is reduced in order to improve the yield of refined grains, the enlarged hole portion 102 of rice grain is increased.
It was not enough to fit in, and the effect of peeling off the bran component at both ends was diminished.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and is capable of sufficiently exfoliating the bran components at both ends of a grain without lowering the yield of refined grain. The purpose of the present invention is to provide a grain refiner capable of improving the removal rate of germs.

[0008]

DISCLOSURE OF THE INVENTION According to the present invention, a grain barrel having a grain introduction port on one end side and a grain discharge port on the other end side, and a rotary drive in the grain barrel. Equipped with a refined grain roll, the peripheral surface of the refined grain roll is provided with a pair of stirring blades extending in the rotation axis direction and a plurality of recesses arranged side by side in the rotation axis direction, the plurality of recesses of the grain The groove has a wall surface having a downward slope in the feed direction and a wall surface having an upward slope in the grain feed direction, and is constituted by a groove having a substantially V-shaped cross section, and the ridgeline where the two wall surfaces of the recess intersect is a rotation axis. It is intended to solve the above-mentioned conventional problems by providing a grain refiner formed to have a predetermined inclination. Further, in the grain refiner, the stirring blade is formed in a substantially rectangular cross section having a wall surface on the front side in the rotation direction and a wall surface on the rear side in the rotation direction, and the recess is substantially cross-sectional in the vicinity of the wall surface on the front side in the rotation direction of the stirring blade. It may be formed in an oval shape. Further, in each of the above configurations, the inclination of the ridgeline where the two wall surfaces of the recess intersect with each other with respect to the rotation axis may be set so that the intersecting angle of the grain feeding direction between the ridgeline and the rotation axis is less than a right angle.

Further, the present invention further relates to a grain barrel having a grain inlet at one end and a grain outlet at the other end, and a grain that is rotatably driven inside the grain barrel. In a grain refiner equipped with a roll, a pair of stirring blades extending in the rotation axis direction and a groove-shaped recess having independent rectangular cross-sections arranged side by side in the rotation axis direction on the peripheral surface of the grain refinement roll. A plurality of agitating blades, the stirring blade is formed in a substantially rectangular cross section having a wall surface on the front side in the rotation direction and a wall surface on the rear side in the rotation direction, and the wall thickness of the grain roll is maximum at the portion connecting to the wall surface on the front side in the rotation direction. By increasing the pressure on the grain between the inner wall of the grain barrel and the peripheral surface of the grain roll, the long side walls of the plurality of recesses are formed to have a predetermined inclination with respect to the rotation axis, The inclination is set so that the crossing angle of the grain feeding direction is less than a right angle. The present invention aims to solve the above-mentioned conventional problems.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A grain refiner according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is used as a whole.
The grain refiner indicated by 1 has a grain barrel 4 having a grain inlet 2 at one end and a grain outlet 3 at the other end, and a grain barrel 4 arranged inside the grain barrel 4. And a grain roll 5.

The fine grain cylinder 4 is formed in a polygonal cylinder shape or a cylindrical shape such as a hexagonal cylinder, and is supported by the frame body 6 at one end thereof. A large number of slit holes 7 are bored in a portion of the grain refiner 4 surrounding the grain refiner roll 5, and a hopper 8 for collecting rice bran provided below this portion is connected to a grain-collecting blower (not shown) or the like. Has been. The discharge port 3 of the grain refiner 4 is biased by a biasing means (not shown) such as a spring in a direction to close the discharge port 3, and the biasing force is adjustable.
Is provided.

A rotary shaft 10 is pivotally supported on the frame body 6,
Pulleys 11a, 11b and V provided on one end side thereof
It is configured to be rotationally driven by the motor 12 via the belt 11c. The other end of the rotary shaft 10 projects into the grain barrel 4, and the screw-shaped grain-feeding roll 13 and the grain roll 5 are externally fitted to the projecting portion to rotate with respect to the rotary shaft 10. It is fixed by a key (not shown) or the like so as not to do so.

2 to 5 for the fine grain roll 5.
It will be described based on. The fine grain roll 5 is formed in a substantially cylindrical shape having a hollow portion 14 for inserting the rotary shaft 10. A pair of stirring blades 15 extending in the rotation axis direction are integrally formed on the peripheral surface of the fine grain roll 5. As is clear from the drawing, each stirring blade 15 is formed in a substantially rectangular cross section, and the pair of stirring blades 15 are extended linearly in parallel with each other.

Further, as shown in FIG. 3, each stirring blade 1
5 is a portion connected to the wall surface 15a on the front side in the rotation direction r of 5,
The refined grain roll 5 has the largest thickness, and is gradually thinned toward the other stirring blades 15. Therefore, the front wall surface 15a of the stirring blade 15 is lower than the rear wall surface 15b.

A plurality of recesses 16 are arranged side by side in the rotation axis direction on the peripheral surface of the grain mill roll 5 near the wall surface 15a. Each recess 16 is formed in a groove shape having a substantially V-shaped cross section from a wall surface 16a having a downward slope in the grain feeding direction f and a wall surface 16b having an upward slope in the grain feeding direction f.
Further, as shown in FIG. 4, each recess 16 has a ridge line direction 16c at which the wall surface 16a and the wall surface 16b intersect, and the stirring blade 1.
The angle lock (see FIG. 4) intersecting the imaginary line X parallel to the wall surface 15a of No. 5 is provided so as to be about 75-, for example.

Next, the operation when the rice is refined using the grain refiner 1 will be described. Rotating shaft 10 by motor 12
When rice grains are supplied to the introduction port 2 while being rotationally driven counterclockwise as viewed from the discharge port 3 side, the rice grains are introduced from the introduction port 2 into the fine grain cylinder 4 and rotate integrally with the rotating shaft 10. The grain is fed in the grain feeding direction f by the action of the roll 13.

The rice grains reaching the gap between the grain roll 5 and the grain barrel 4 are agitated by the stirring blades 15 of the grain roll 5 rotating integrally with the rotary shaft 10, and the rice grains are rubbed against each other. The bran component is peeled off.

FIG. 6 explains the state of the rice grains at this time.
In the figure, the symbol g indicates a rice grain. As described above, most of the rice grains g have a longitudinal axis of the stirring blade 1.
5 is oriented parallel to the wall surface 15a of the
The rice grain g dropped in 6 has its longitudinal axis parallel to the ridge direction 16c of the recess 16 (that is, the longitudinal axis has an imaginary line parallel to the wall surface 15a of the stirring blade 15 and the angle lock). Turn (to intersect).
(This is referred to as "biasing" below.)

Then, the deflected rice grain g is
The bottom of 6 is moved in an oblique direction so as to approach the wall surface 15a while returning toward the inlet 2 as shown by the arrow a,
Next, the rice grains g having a high density gathered in front of the wall surface 15a collide from one end in the longitudinal direction, and the impact of this collision and the stirring force of the stirring blade 15 rub the rice grains g against each other. To be combined.

Therefore, a sufficient friction action is exerted on both ends of the rice grain g, so that not only the body portion of the rice grain g but also the bran components at both ends are peeled off, and the germ at one end of the rice grain g is also sufficient. It is removed with a removal rate.

As described above, the rice grains as a whole are fed in the grain feeding direction f while peeling off the bran component. Then, when reaching the discharge port 3, the rice grain pushes open the resistance lid 9 against the biasing force of the biasing means, and goes out of the grain barrel 4 through the discharge port 3. The bran component separated from the rice grains is discharged to the outside of the fine grain cylinder 4 through the slit holes 7 by the suction of the bran collecting blower.

In the above-mentioned conventional grain refiner, the rice grain restrained in the expansion hole is broken by the impact caused by the collision with the other rice grain which follows, and the fine grain of the rice grain is discharged out of the grain cylinder through the expansion hole. Therefore, the grain yield was low, but in this grain mill 1, since the grain of rice is not restrained, the grain of rice is not broken or the yield of grain is low. .

The position of the concave portion 16 in the circumferential direction is not particularly limited, but as in this embodiment, the stirring blade 1
It is more preferable to provide it in the vicinity of the wall surface 15a on the front side of No. 5. That is, since the frictional action between the rice grains mainly works on the rice grains having a high density (pressure) collected by the stirring blade 15, if the recess 16 is provided near the wall surface 15a, the direction of the recess 16 is changed. The rice grains that have been removed will be subjected to frictional action in that orientation. On the other hand, if the recess 16 is provided at a position away from the wall surface 15a,
Even if the direction of the rice grain is changed by the concave portion 16, there is a possibility that the rice grain may have returned to the direction in which the longitudinal axis of the rice grain is parallel to the stirring blade 15 at the time when the frictional action is exerted on the rice grain.

The inclination of the recess 16 with respect to the rotation axis is not particularly limited, but as in this embodiment, the rice grain that has fallen into the recess 16 is inclined in the direction of returning to the inlet 2 side (returning direction). More preferable. By doing so, as shown in FIG. 7A, the rice grain g that has moved to the bottom of the recess 16 and the rice grain g that has been fed in the grain feeding direction f are at an angle closer to a frontal collision than a right angle. This is because the frictional action acting on both ends of the rice grain is increased due to the collision. On the other hand, when the concave portion 16 is provided by inclining the depressed rice grain toward the discharge port 3 side (feeding direction), the rice grain g that has moved to the bottom of the concave portion 16 as shown in FIG. 7B, The rice grains g sent in the grain-feeding direction f collide with each other at an angle close to a side collision, and there is a possibility that the frictional action acting on both ends of the rice grains becomes small.

Incidentally, when the recess 16 is provided so as to be inclined in the returning direction, it is particularly preferable that the angle bar shown in FIG. 4 is 60-80. That is, when the angle lock is smaller than 60-, the difference in the moving direction with respect to the rice grains fed in the grain feeding direction f becomes too large as a whole in the grain barrel 4, and the wall surface of the rice grains dropped in the recess 16 is too large. The movement toward 15a tends to be hindered. On the contrary, when the angle becomes closer to a right angle than 80 °, the action / effect of increasing the frictional action acting on both ends of the rice grain tends to decrease.

Further, in order to smoothly drop the rice grain into the concave portion and deflect the rice grain due to this depression, the concave portion is formed in a groove shape having a substantially V-shaped cross section as described above. , Particularly preferred. However, the shape of the concave portion in the present invention is not limited to this, and a groove-shaped concave portion 17 having a rectangular cross section as shown in, for example, FIGS. 8 and 9 is formed on the peripheral surface of the grain mill roll 5. May be.

Further, instead of the concave portion, the convex portion 18 as shown in, for example, FIGS. 10 and 11 is provided on the peripheral surface of the fine grain roll 5.
May be formed. By doing so, the axis of the rice grain in the longitudinal direction is aligned with the wall surface 18a of the convex portion 18 on the upstream side in the grain feeding direction f, so that the rice grain is deflected similarly to the case where the concave portion is formed. Almost the same effect is obtained that the bran components at both ends of the rice grain can be peeled off. However, the convex portion 18
Since it is easily worn, it is necessary to prevent the wear by using a hard material.

The inventor of the present invention projects a convex portion having the same shape as the convex portion 18 on the inner surface of the grain refining barrel 4 inclining with respect to the direction of the rotation axis, and deflects the rice grains by the convex portion. Although an attempt was also made, the effect of peeling off the bran component at both ends of the rice grain was inferior to that in the case where the concave portion or the convex portion was formed on the peripheral surface of the fine grain roll 5 as in the present invention. This is because the milling roll 5 rotates, whereas the milling barrel 4 is fixed, so the opportunity for the rice grains to contact the inner surface of the milling barrel 4 is greater than the opportunity to contact the peripheral surface of the milling roll 5. It is believed that this is because the number of rice grains is reduced, and thus the action of deflecting rice grains is also reduced.

By the way, the refined grain roll according to the present invention is not limited to the one having the linear stirring blades 15 like the refined grain roll 5, but, for example, as shown in FIG. The recess 16 similar to the above may be formed on the peripheral surface of the grain roll 20 provided with the stirring blade 19 that is curved in a "V" shape.

Further, the refined grain roll according to the present invention may have a shape as shown in FIGS. 13 and 14 described in JP-B-63-24741. That is, the grain refinement roll 21 has a stirring blade 22 projecting from the roll peripheral surface having a small diameter on the upstream side in the grain feeding direction f, and the peripheral side of the peripheral surface of the stirring blade 22 in the rotational direction r with respect to the stirring blade 22. The diameter is gradually increased to a substantially involute shape, and on the downstream side in the grain feeding direction f, the top surface of the stirring blade 23 extending from the stirring blade 22 and the roll peripheral surface are formed to have the same height. The concave portion 16 similar to the above may be formed on the peripheral surface of such a fine grain roll 21.

In the above embodiment, the case where the rice grains are refined has been described, but it goes without saying that the grains refined by the grain refiner according to the present invention may be other than rice grains. .

Further, in the present invention, in addition to the grain refiner for grain refinement by only one unit, 2 to 4 grain refiners are arranged in series, and stepwise from the initial grain refinement to the finished grain refinement is carried out. The present invention can also be applied to one or a plurality of grain refiners in the grain refiner configured to perform the above.

[0033]

As described above, in the grain refiner according to the present invention, the grain inside the grain barrel is lengthened by the concave portion or the convex portion provided on the circumferential surface of the grain roll. The axis of the direction is deflected so that it intersects with an imaginary line parallel to the wall surface of the stirring blade, so that sufficient friction action is exerted on both ends of the grain, and the bran component at both ends is also sufficiently peeled off. And the removal rate of the germ can be sufficiently increased. Moreover,
Unlike the conventional grain refiner with an enlarged hole formed in the wall of the grain mill, it does not restrain one end of the grain, so the grains do not break due to collisions between grains, and therefore the grain yield is improved. It does not decrease.

[Brief description of drawings]

FIG. 1 is a side sectional view of a grain refiner according to an embodiment of the present invention.

FIG. 2 is a side view of a grain roll in the grain mill of FIG.

FIG. 3 is a front view of a grain roll seen from the direction of arrow A in FIG.

FIG. 4 is a side view of the grain roll seen from the direction of arrow B in FIG.

FIG. 5 is an enlarged cross-sectional view of a main part of a refined grain roll cut along line C-C in FIG. 4.

FIG. 6 is an enlarged side view of an essential part of FIG. 4 for explaining the state of rice grains.

FIG. 7 is an explanatory diagram illustrating collision angles between rice grains.

FIG. 8 shows a grain roll according to another embodiment of the present invention.
It is the side view seen from the direction equivalent to.

9 is an enlarged cross-sectional view of essential parts of a grain roll cut along the line D-D in FIG. 8.

FIG. 10 is a side view of a grain roll according to still another embodiment of the present invention, as seen from a direction corresponding to FIG.

FIG. 11 is an enlarged cross-sectional view of the essential parts of a grain roll cut along the line EE of FIG.

FIG. 12 is a side view of a grain roll according to still another embodiment of the present invention.

FIG. 13 is a side view of a grain roll according to still another embodiment of the present invention.

FIG. 14 is a front view of a grain roll seen from the direction of arrow F in FIG.

FIG. 15 is an enlarged explanatory view of a main part of a grain barrel in a conventional grain mill.

[Explanation of symbols]

1 grain mill 2 entrance 3 outlets 4 fine grain cylinder 5 fine grain rolls 10 rotation axis 15 stirring blades 15a wall surface 16,17 recess 18 convex 19,23 Stirring blade 20,21 Fine grain roll

Claims (4)

(57) [Claims] 1. A grain introduction port is provided on one end side, and the grain introduction port is provided on the other end side.
A grain barrel with a grain outlet and rotation inside this grain barrel
And a peripheral surface of the grain roll which is driven.
Is a pair of stirring blades extending in the direction of the rotation axis and the rotation axis direction.
Providing a plurality of recesses arranged side by side, these recesses
Gradient wall and grain feed toward the grain feed direction
With an upwardly sloping wall toward the direction
And the wall surfaces of the recess intersect.
The ridge is formed so that it has a certain inclination with respect to the rotation axis.
A grain refiner characterized by that. 2. The grain refiner according to claim 1, wherein
The stirring blade is a wall surface on the front side in the rotation direction and a wall surface on the rear side in the rotation direction.
Is formed into a substantially rectangular cross section having
Formed in an elliptical cross section near the front wall in the rolling direction.
A grain refiner characterized by that. 3. A ridge line that intersects both wall surfaces of the recess.
The inclination with respect to the rolling axis is based on the
The crossing angle in the vertical direction is set to less than a right angle
The grain refiner according to claim 1 or 2. 4. A grain introduction port is provided at one end side, and the grain introduction port is provided at the other end side.
A grain barrel with a grain outlet and rotation inside this grain barrel
A milling machine with a driven milling roll, wherein
A pair of stirrers extending in the direction of the rotation axis are provided on the peripheral surface of the grain roll.
Independent traverses arranged side by side with the stirring blade in the direction of the rotation axis
A plurality of groove-shaped recesses with rectangular surfaces are provided, and the stirring blade is rotated.
It has a wall surface on the front side in the rolling direction and a wall surface on the rear side in the rotating direction.
Form a rectangular cross-section and adjust the thickness of the grain roll as above.
Grinding cylinder is maximized at the part connected to the front wall in the rolling direction
Increase the pressure on the grain between the inner wall of the grain and the surface of the grain roll,
The long side walls of the plurality of recesses have a predetermined inclination with respect to the rotation axis.
It is formed so that it has a crossing angle in the grain feeding direction.
The feature is that the degree is set to be less than a right angle.
Grain machine.