JP2015139765A - Grain milling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of remarkably increasing a grain crushing rate of a grain, when a body crack of chipping a part of the grain is caused, by receiving pressure by a milling roll in a held state when a part of the grain enters a slit by a size of a slit width, though rice bran is removed by the slit provided in a rice bran removing net, by supplying the grain between the milling roll and the rice bran removing net for covering an opening part of a casing, by inserting the milling roll having a screw thread part on an outer peripheral surface into the cylindrical casing, in a conventional grain milling machine of the grain.SOLUTION: A rice bran removing net 33 is formed by boring a slit 35 in a sheet member 36, and assuming a slit width of the slit 35 as S, a length directional diameter in unpolished rice 37 being the grain as L, a width directional diameter as W, and the smallest one among a thickness directional diameter T as a grain diameter G, S/G is set to 0.4 or less.

Description

  The present invention relates to a grain refiner equipped with a milling device that supplies grain between a dehulling net and a whitening roll to perform a whitening process, and particularly relates to a slit structure of the dehulling net.

  Conventionally, in a grain refiner such as brown rice, rice bran, and acne, a whitening roll that is horizontally disposed and has a thread portion on the outer peripheral surface is inserted into a cylindrical casing, A technique related to a whitening device that supplies grain between a dehulling net that covers an opening of a peripheral surface portion and the whitening roll is known (for example, see Patent Document 1).

  In this technique, the grain is pressed by the rotating whitening roll while being agitated, and is pressed toward the dehulling net. Therefore, the grain is ground or scraped by the opening edge of the slit formed in the dehulling net. Impurities such as cocoons and rice husks on the surface (hereinafter referred to as “cocoons”) are removed, and the cocoons and the like pass through the slits and flow down and stored in a coffin box disposed below the slits. .

Japanese Utility Model Publication No. 6-63141

  However, depending on the size of the slit width of the slit, a part of the grain enters the slit, the grain is subjected to pressure by the whitening roll while being sandwiched by the slit, and a part of the grain is There was a problem that chipping or torso cracking occurred, and the pulverization rate of the grain was remarkably increased.

Therefore, as a result of intensive studies to solve the above problems, the present inventor suppresses grain chipping and cracking by adjusting the slit width of the slit to a predetermined value according to the size of the grain. In addition to such “dimension adjustment”, it has been found that the effect of suppressing particle crushing can be further improved by “shape adjustment” in which the opening edge of the slit is adjusted to a predetermined shape.
That is, according to the first aspect of the present invention, in the grain refiner provided with a milling device for supplying grain between the milling net and the milling roll and performing the milling process, the milling net has a slit formed in the sheet member. S / G when the slit width of the slit is S, and the smallest of the diameter, the width direction diameter and the thickness direction diameter in the grain is the grain diameter G. Is set to 0.4 or less.
According to a second aspect of the present invention, the opening edge portion on the whitening roll side of the slit has a cross-sectional viewing angle shape and is formed substantially flush with the surface of the sheet member around the opening edge portion.
According to a third aspect of the present invention, the slit is formed by photoetching.
The length direction diameter, the width direction diameter, and the thickness direction diameter indicate the maximum diameter in the length direction, the maximum diameter in the width direction, and the maximum diameter in the thickness direction, respectively.

Since this invention was comprised as mentioned above, there exists an effect shown below.
That is, according to claim 1, it is possible to prevent a part of the grain from entering the slit, and to prevent the grain from being subjected to pressure by the whitening roll while being sandwiched by the slit. It is possible to suppress the occurrence of chipping and torso cracking and to reduce the crushed rate of the grains.
According to claim 2, the grain enters the slit along the opening edge of the R shape in cross section, or collides with a protrusion from the opening edge to the outside, and the grain is overloaded. This is eliminated, and the occurrence of grain chipping and cracking of the body can be further reduced, and the grain crushing rate can be further reduced.
According to claim 3, unlike in the case of machining such as punching, the sag of the R shape in cross section accompanying shearing and the burr protruding sharply outward are not formed at the opening edge of the slit. It is possible to reliably suppress the occurrence of grain chipping and torso cracking. Furthermore, expensive molds and jigs necessary for the machining are not necessary, and the machining cost can be greatly reduced.

It is a perspective view which shows the whole structure of the grain refiner concerning this invention. It is a front sectional view similarly. It is the perspective view which looked at the whitening apparatus from the front slanting lower part which shows the structure of a whitening apparatus. FIGS. 4A and 4B are enlarged plan views showing the arrangement of the plurality of slits, and FIG. 4B is an enlarged plan view showing the dimensions of the slits. 4A is a cross-sectional view taken along the line AA in FIG. 4B, FIG. 5A is a cross-sectional view of a slit made by photoetching, and FIG. 5B is a view of the slit made by punching. It is a cross-sectional view. It is an external view which shows the dimension of brown rice, Comprising: Fig.6 (a) is a front view of brown rice, FIG.6 (b) is a side view of brown rice. It is a crushed rate curve figure which shows the influence of the slit width and slit opening edge shape which has on the crushed rate of a grain.

  Hereinafter, the embodiment of the present invention will be described in detail using a case where brown rice is used as a grain as an example. The surface viewed from the direction indicated by the arrow F in FIG. 1 is the front of the rice mill 1 that is a grain mill, and the positions and directions of the respective members described below are based on this front.

First, the whole structure of the rice mill 1 concerning this invention is demonstrated with FIG. 1, FIG.
In the rice mill 1, a hopper 5 for introducing brown rice is disposed at the upper portion thereof, and the hopper 5 is formed in a funnel shape having the upper portion as an input port 5 a and is placed and fixed on the base 23. The box-shaped main body case 21 is fixed on the upper surface.

  A whitening device 4 for whitening brown rice is disposed in the upper part of the main body case 21, and a connection cover 6 is covered on the upper left side of the main body case 21. In the space between the connecting cover 6 and the upper left side surface of the main body case 21, the polished rice 4 sends brown rice (hereinafter referred to as “milled rice”) that is being polished toward the hopper 5. The rice milling path 3 is formed, and the left part of the whitening device 4 and the left end opening 5c of the hopper 5 are communicated with each other through the rice milling path 3.

  Further, a resistance plate 10 for adjusting the pushing pressure of the milled rice from the milling device 4 into the hopper 5 is disposed in the milled rice feed path 3. The resistance plate 10 is fixed to a support shaft 9 laid horizontally on the upper portion of the connection cover 6, and the support shaft 9 is supported by a resistance adjustment handle 11 so as to be rotatable.

  In addition, an opening 6a is formed in the lower portion of the connecting cover 6, and a shutter 7 that can be opened and closed by a lever 7a is covered in the opening 6a, and a discharge rod 6b is provided outside the opening 6a. Inclined to the left and below.

  On the other hand, in the upper right part of the whitening device 4, a rectangular tube-shaped insertion port 24 opened upward is formed, and the right end opening 5 b of the hopper 5 is connected to the upper end opening of the insertion port 24. A rice milling passage 2 for feeding the polished rice in the hopper 5 toward the milling device 4 is formed in the space in the inlet 24, and the hopper is passed through the rice milling passage 2. 5 is communicated with the right end opening 5b and the right part of the whitening device 4.

  Further, a rectifying plate 8 having a mountain shape in cross section is provided between the upper end portion of the rice milling passage 2 and the upper end portion of the rice milling passage 3, and both left and right end portions thereof are connected to each other. It is provided in the lower part.

  In addition, a basket box 12 for storing baskets and the like at the front part of the base 23 is placed in the lower part of the main body case 21, and an electric motor 13 is installed behind the basket box 12.

  The electric motor 13 is fitted and fixed to the lower opening 21c1 of the right side wall 21c of the main body case 21 from the left side, and a motor shaft 14 protrudes from the electric motor 13 to the right side. On the other hand, a bearing housing 18 is fixed to the upper opening 21c2 of the right side wall 21c so as to protrude inward, and a pair of left and right bearings 19 and 19 are accommodated in the bearing housing 18. A drive shaft 20 that drives the whitening device 4 is rotatably supported in parallel with the motor shaft 14 by bearings 19 and 19.

  Here, a power transmission path 25 is formed in a space between the right side wall 21c and the belt cover 22 covered on the outer surface of the right side wall 21c. The power transmission path 25 includes a drive pulley 15 fixed to the right end of the motor shaft 14, a driven pulley 17 fixed to the right end of the drive shaft 20 having a larger diameter than the drive pulley 15, The driven pulley 17 and the belt 16 wound between the driving pulley 15 are accommodated, and the pulleys 15 and 17 and the belt 16 constitute a belt type transmission mechanism 26.

  Further, a cover 27 is provided in an opening (not shown) on the front side wall 21a of the main body case 21. A knob 27a provided on the upper outer surface of the cover 27 is pulled forward, so that the box 12 By pulling out the soot, the soot and the like in the soot box 12 can be collected.

  In such a configuration, when brown rice is introduced into the hopper 5 from the inlet 5a and is almost full, the brown rice flows into the whitening device 4 through the rice milling passage 2. When the whitening device 4 is driven by the motor power transmitted from the electric motor 13 to the drive shaft 20 via the belt-type transmission mechanism 26, the brown rice is pushed leftward while being whitened. It is pushed up from the milled rice feed path 3 into the hopper 5. The push-up pressure at this time can be adjusted by changing the inclination angle of the resistance plate 10 by rotating the resistance adjusting handle 11.

  Then, the pushed-up milled rice passes over the current plate 8 from the left part of the hopper 5 and flows into the right part of the hopper 5 and again flows into the milling device 4 through the rice milling passage 2, By repeating the circulation, a so-called circulation type rice mill 1 is formed.

  At this time, every time the milled rice passes through the milling device 4, soot and the like are removed and the milling process proceeds. On the other hand, the removed soot and the like flow down into the straw box 12 and stored. The milled rice that has reached a predetermined milling degree is made to flow down from the discharge trough 6b and be taken out by opening the shutter 7 by operating the lever 7a.

Next, the whitening device 4 will be described with reference to FIGS.
The whitening device 4 is provided with a cylindrical casing 28 disposed in a substantially horizontal state below the hopper 5 and a whitening roll 29 inserted through the axial center of the casing 28.

  The charging port 24 is formed in the upper right part of the casing 28, and the right end opening 5 b of the hopper 5 is connected to the upper end opening of the charging port 24 as described above.

  The whitening roll 29 is inserted on the axial center of the casing 28, and a helical thread portion 29 a is formed on the outer peripheral surface of the whitening roll 29. Further, the whitening roll 29 has a cylindrical shape, in which the drive shaft 20 is inserted and integrated, and is driven to rotate by the motor power from the electric motor 13.

  Further, in the casing 28, flange portions 28c and 28d are formed at both left and right ends thereof, the left flange portion 28c is fixed to the left side wall 21b of the main body case 21, and the right flange portion 28d is The whitening device 4 is arranged at the upper part in the main body case 21 so as to be fixed to the bearing housing 18.

  Further, the lower peripheral surface excluding the left and right end surfaces of the casing 28 is removed in a semi-cylindrical shape to form an opening 31, and from the outer peripheral surface of the casing 28 along the upper edge of the opening 31. Thus, a pair of front and rear mounting ribs 28a and 28b project substantially horizontally outward. The mounting ribs 28a and 28b are provided in parallel to the axial center direction of the casing 28, and a removal member 32 that covers the opening 31 is rotatably attached to the rear mounting rib 28b.

  The removal member 32 includes a semi-cylindrical removal net 33 and a support frame 34 that supports the removal net 33 in a semi-cylindrical curved state. The support frame 34 includes a pair of front and rear linear frames 34a and 34b, a pair of semicircular left and right flange frames 34c and 34d for connecting the ends of the linear frames 34a and 34b, and the flanges. It consists of two semi-annular reinforcing ribs 34e and 34e installed between the straight frames 34a and 34b at substantially equal intervals between the frames 34c and 34d, and the whole is formed in a semi-cylindrical shape. Of these, the rear straight frame 34b is rotatably attached to the rear mounting rib 28b via a hinge (not shown).

  The debris net 33 is supported in a semi-cylindrical shape on the inner peripheral surfaces of the flange frames 34c and 34d and the reinforcing ribs 34e and 34e in the support frame 34.

  In such a configuration, when performing the whitening work, the support frame 34 is rotated upward about the rear straight frame 34b rotatably attached to the mounting rib 28b of the casing 28, and the front side The upper surface of the straight frame 34a is brought into contact with the lower surface of the attachment rib 28a, and in this state, the engagement lever 30 provided on the attachment rib 28a is rotated to engage the engagement piece 34a1 provided on the straight frame 34a. Engage with. Thereby, the semicylindrical removal net 33 supported by the support frame 34 can be locked in a state in which the opening 31 of the casing 28 is covered.

  When the brown rice put into the hopper 5 in this locked state flows into the casing 28 through the rice milling passage 2 in the filling port 24, the whitening roll 29 inserted into the casing 28 is rotated. Along with this, the screw thread 29a is sequentially moved to the left while spirally rotating, and during the movement, the pressure is applied toward the debonding net 33 while stirring.

  Then, wrinkles and the like are removed by grinding or rubbing with a large number of slits 35 drilled in the debris net 33, and the whitening process proceeds. It flows down and is stored.

Next, the structure of the slit 35 of the debris net 33 will be described with reference to FIGS.
As shown in FIGS. 3 to 5, the debris net 33 has a plurality of slits 35 formed in a straight line along the axial direction of the casing 28 in a sheet member 36 made of stainless steel sheet or the like. In addition, the staggered arrangement is made along the circumferential direction of the casing 28 indicated by the arrow 44.

  Due to the arrangement of the slits 35 in the axial direction, the slit 35 has an opening on the whitening roll 29 side in the corner (hereinafter referred to as “opening edge”) on the upper surface 36T side or the lower surface 36U side of the sheet member 36. An angle θ formed between the edge portions 35a and 35a and the moving direction indicated by the arrow 38 of the brown rice 37 pushed in the direction of the arrow 41 while rotating in a spiral shape can be brought close to a right angle, and the opening edge portion 35a -The effect of grinding and scratching by 35a is increased. Furthermore, the frequency of the brown rice 37 crossing over the opening edge portions 35a and 35a is increased by the staggered arrangement of the slits 35 in the circumferential direction. Thereby, the removal efficiency of the brown rice 37 and the like by the opening edge portions 35a and 35a is increased.

  In the slit 35 arranged as described above, the slit width is S, and the smallest one among the length direction diameter L, the width direction diameter W, and the thickness direction diameter T of the brown rice 37 shown in FIG. When thickness direction diameter T was made into grain size G, it became clear that S / G was 0.4 or less.

  When the S / G exceeds 0.4, a part of the brown rice 37 enters the wide slit 35 and is sandwiched by the slit 35, and the thread portion 29a of the rotating whitening roll 29 or the screw This is because a large pressure is likely to act from the other brown rice 37 being transferred by the mountain portion 29a toward the brown rice 37 being sandwiched.

  Further, in the slit 35, as shown in FIG. 5A, the opening edge portions 35a and 35a have a cross-sectional angle shape, and on the upper surface 36T that is the surface of the sheet member 36 on the whitening roll 29 side. On the other hand, it has been found preferable to be substantially flush.

  As shown in FIG. 5 (b), when the opening edge portions 39a and 39a are formed in an R shape in cross section, the brown rice 37 enters the slit 39 along the opening edge portions 39a and 39a, Further, when a protrusion projecting sharply outward beyond the lower surface 36U is formed on the opening edge portions 39b and 39b, the debris net 33 is mistakenly directed to the whitening roll 29 side to support the debris net 33. This is because, when attached to 34, the brown rice 37 collides with the protrusions, and the brown rice 37 is overloaded and easily broken.

  It has also been found that the slit is preferably formed by photoetching. In the photo-etching process, a photoresist, which is a photosensitive resin, is applied to the sheet member 36, which is a base material, and light is irradiated through a film mask formed in a predetermined slit pattern. Then, the slit 35 is formed by removing the portion that is not exposed by etching.

  The slits 35 in FIG. 5A are formed by performing such photo-etching on both the upper and lower surfaces 36T and 36U of the sheet member 36. In this photo-etching, corrosion is isotropic. Therefore, undercuts 36a and 36b are formed on the side edges on the corrosion root side. Since the undercuts 36a and 36b are formed in a concave shape projecting inward toward the center of the plate thickness, the opening edges 35a and 35a of the slit 35 have a cross-sectional angle shape, and from the upper and lower surfaces 36T and 36U. It does not protrude outward.

  On the other hand, the slit 39 in FIG. 5B is formed by performing a so-called punching process from the upper surface 36T side of the sheet member 36. In the punching process, the slits 36c are sequentially formed from the upper surface 36T side. A shearing surface 36d, a fracture surface 36e, and a burr 36f are formed. For this reason, the opening edge portions 39a and 39a on the upper surface 36T side are formed with the droop 36c so as to have an R shape in sectional view, and as described above, the brown rice 37 can easily enter the slit 39, and the opening edge on the lower surface 36U side. The burr 36f is formed in the portions 39b and 39b, and when the dehulling net 33 is attached to the support frame 34 with the lower surface 36U facing the whitening roll 29 side by mistake, the brown rice 37 collides with the burr 36f. To do.

Hereinafter, the present invention will be described in more detail with reference to examples.
As shown in FIG. 4 (a), the stripping net 33 has a sheet member 36 made of stainless steel (SUS304) having a thickness of 0.5 mm, slits 35 having a slit length SL of 15 mm, a center pitch P1 of 17 mm, It is produced by staggering along the circumferential direction of the casing 28 so that the vertical pitch P2 is 3 mm. At this time, the slit 35 is formed by photoetching from the upper and lower surfaces 36T and 36U, and only the slit width S is 0.5 mm, 0.7 mm, 1.0 mm, 1.2 mm, 1. Five kinds of demolition nets 33 having five stages of 5 mm are produced.

  Further, the sheet member 36 is punched from the upper surface 36T side so as to have the same size and position as the debris net 33, and slits 39 are formed in the same manner. Similarly, only the slit width S is 0.5 mm, Five types of pruning nets 33P having five stages of 0.7 mm, 1.0 mm, 1.2 mm, and 1.5 mm are manufactured.

  In addition, as described above, the length direction diameter L, the width direction diameter W, and the thickness direction diameter T of the brown rice 37 are measured as shown in FIG. Was measured in the same manner, and the grain size G was 1.8 mm.

  Moreover, the pulverization rate B was calculated | required from the refined grain which completed the whitening process as what shows the generation | occurrence | production of the chip | tip of a grain like brown rice, rice bran, and acne, and a crack generation | occurrence | production. The pulverization rate B is expressed by pulverization rate B (%) = [weight of crushed particles (g) / weight of whole polished grains (g)] × 100. In addition, the crushed particle | grains shall have lacked 1/3 or more of full length visually.

  In FIG. 7, the change of the pulverization rate B in each of the debris nets 33 and 33P obtained when the S / G is changed by changing the slit width S between 0.5 mm and 1.5 mm is shown by the curve 45. , 46.

  In any of the curves 45 and 46, it can be seen that when the S / G is 0.4 or less, the pulverization rate B is greatly reduced. Furthermore, the pulverization rate B of the curve 45 tends to be lower than the pulverization rate B of the curve 46 over the entire S / G range of this example. It can be seen that it is significantly enlarged below 4.

  That is, in the rice milling machine 1 that is a milling machine 1 provided with a milling device 4 that supplies brown rice 37 that is a grain between the milling net 33 and the milling roll 29 to perform the milling process, The slit 35 is formed by perforating the sheet member 36, and the slit width of the slit 35 is S, which is the smallest of the length L in the longitudinal direction, the diameter W in the width direction, and the diameter T in the thickness direction of the brown rice 37 When the grain size G is set to S, the S / G is set to 0.4 or less, so that part of the brown rice 37 is prevented from entering the slit 35, and the brown rice 37 is sandwiched between the slits 35. It can prevent receiving the pressure by the whitening roll 29 in a state, suppress the generation | occurrence | production of the chip | tip and the body crack of the brown rice 37, and can aim at the fall of the crushed rate B of the brown rice 37.

  Further, the opening edges 35a and 35a on the whitening roll 29 side of the slit 35 have a cross-sectional angle shape, and are substantially flush with the upper surface 36T that is the surface of the sheet member 36 around the opening edges 35a and 35a. As it is formed, the brown rice 37, which is a grain, enters the slit 39 along the opening edges 39a, 39a having a R-shaped cross section, or is a protrusion that protrudes outward from the opening edges 39b, 39b. It is possible to prevent the grain from being overloaded by colliding with 36f, further reducing the occurrence of chipping or cracking of the brown rice 37, and further reducing the crushed rate B of the brown rice 37.

  In addition, since the slit 35 is formed by photo-etching, unlike the case of mechanical processing such as punching, a slit 36c having a R-shaped cross section accompanying shearing processing and a burr 36f that protrudes sharply outward are provided as slits. It is not formed in 35 opening edge part 35a * 35a, and generation | occurrence | production of the chip | tip of the brown rice 37 which is a grain, and a body crack can be suppressed reliably. Furthermore, expensive molds and jigs necessary for the machining are not necessary, and the machining cost can be greatly reduced.

  In addition, the said removal net | network 33 * 33P may have a cylindrical shape, a hexagonal cylinder shape, a casing function, or the shape of the slit may be curved. Is not particularly limited as long as the above-described predetermined slit width is set.

  INDUSTRIAL APPLICABILITY The present invention can be applied to all pulverizers equipped with a pulverizing apparatus that supplies cereal grains between a scouring net and a pulverization roll to perform pulverization treatment.

1 Rice milling machine
4 Whitening device 29 Whitening roll 33 Removal net 35 Slit 35a Opening edge 36 Sheet member 36T Upper surface (sheet member surface)
37 Brown rice (grain)
G Grain particle size L Length direction diameter S Slit width T Thickness direction diameter W Width direction diameter

Claims (3)

  In a pulverizer equipped with a milling device for supplying a grain between a scouring net and a scouring roll and performing a scouring process, the scouring net is formed by drilling a slit in a sheet member. S / G was set to 0.4 or less, when the slit width of S was the smallest grain size diameter in the length direction diameter, width direction diameter and thickness direction diameter of the grain A grain mill characterized by that.   2. The grain refiner according to claim 1, wherein the opening edge portion of the slit on the whitening roll side has a cross-sectional angle shape and is substantially flush with the surface of the sheet member around the opening edge portion. .   The cereal machine according to claim 2, wherein the slit is formed by photoetching.

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