JP2008080199A5 - - Google Patents

Description

Rice milling equipment

  The present invention relates to a rice milling apparatus for whitening brown rice.

Patent Document 1 describes a technique for polishing rice by peeling off the surface of the grain thinly and widely.
Japanese Patent Publication No. 5-12987

Conventionally, it is an object of the present invention to provide a stable milling load and finish milled rice in a good milled state even at the initial stage of milling or at the end of milling where incomplete milling is unlikely to be applied.

In order to solve the above problems, the present invention has taken the following technical means.
That is, according to the first aspect of the present invention, a linear groove (d) parallel to the drive shaft (1) is set on the outer peripheral surface of the cylindrical whitening roll (2) that is rotationally driven by the drive shaft (1). The rice milling apparatus is characterized in that a large number are formed at intervals .

In the invention according to claim 2, the groove (d) has a depth (d1) shallower than the short diameter (r2) of rice (k) and a width (d2) of the long diameter (r1) of rice. The rice milling apparatus according to claim 1, wherein the rice milling apparatus is formed to be narrower and wider than the minor axis (r2) of rice .

According to the first aspect of the present invention, since the side surfaces d3 and e3 of the groove portions regularly contact the surface of the brown rice or the polished rice one after another to the brown rice filled in the polishing chamber, the rice bran layer on the surface of the brown rice or the polished rice is efficiently used. Can be peeled off well. Therefore, while it is possible to finish the milled rice with a good finish, the milling roll only forms a straight groove, so that the milling roll can be made at a low cost with a simple configuration .

According to the second aspect of the present invention, rice can be prevented from being clogged in the groove d .

As the best mode for carrying out the invention, a rice milling apparatus S that finishes brown rice to wash-free rice will be described.
A whitening roll 2, a conveying spiral 3, and a polishing roll 4 are appropriately attached along the vertical direction on the drive shaft 1 of the vertical axis, and these are configured to rotate with the rotation of the drive shaft 1.

  The transport spiral 3 includes a first transport spiral 3a and a second transport spiral 3b, and the whitening roll 2 includes a first whitening roll 2a and a second whitening roll 2b. From the top, the first transporting spiral 3a and the first whitening roll 2a are provided. The conveying spiral 3 and the whitening roll 2 are alternately arranged in the vertical direction in the order of the second conveying spiral 3b and the second whitening roll 2b.

  The drive shaft 1 is provided with a first drive shaft 1a and a second drive shaft 1b on the same vertical axis, and the first drive shaft 1a includes a first transport spiral 3a, a first whitening roll 2a, and a second transport spiral 3b. The second drive shaft 1b is configured to drive through the second whitening roll 2b and the polishing roll 4.

The first drive shaft 1a is configured to penetrate the inside of the second drive shaft 1b and is supported by the upper bearing portion w and the lower bearing portion x.
The first drive shaft 1a is driven by the first drive shaft drive motor M1, and the second drive shaft 1b is driven by the second drive motor M2. The first drive shaft 1a and the second drive shaft 1b are each configured to rotate in the reverse direction, and the first drive shaft drive motor M1 is a variable speed motor that can change the rotational speed with an inverter (not shown). The second drive shaft drive motor M2 is configured with a fixed rotational speed.

  The whitening roll 2 is made of metal (for example, stainless steel), and the polishing roll 4 is made of a plurality of stages of foamed resin. The discharge roll 7 is also made of a plurality of stages of foamed resin, but may be a normal wing as long as it can discharge polished rice.

On the outer peripheral surfaces of the first whitening roll 2a and the second whitening roll 2b, a large number of line-shaped grooves d and e are formed at set intervals in the direction parallel to the drive shaft 1, respectively.
Groove parts d and e are formed with depths d1 and e1 shallower than the thickness of rice (about 2 mm) (about 0.4 to 0.5 mm), and widths d2 and e2 are formed with a major axis r1 of rice (about 7 mm). ) Narrower than the minor axis r2 (about 3 mm) of the rice (about 5 mm), so that the rice does not clog the grooves d and e.

  Moreover, the inside of the 1st whitening chamber m and the 2nd whitening chamber o which are mentioned later by adjusting the flow volume of the whitening rice which passes along an outer peripheral part in the lower end part of each of the 1st whitening roll 2a and the 2nd whitening roll 2b. Adjusting protrusions g and h for adjusting the pressure of each are provided.

  The outer cylinder 5 is provided with a supply port 6 on one side thereof, and the upper outer cylinder 5a covering the periphery of the dispersion 11 and the first conveying spiral 3a, the first whitening roll 2a, the second whitening roll 2b, and the polishing roll 4 The middle outer cylinder 5b that covers the periphery of the discharge roll 7 and the lower outer cylinder 5c that covers the periphery of the discharge roll 7 are configured. The upper outer cylindrical body 5a, the middle outer cylindrical body 5b, and the lower outer cylindrical body 5c each have a flange portion f1 and are configured to be detachable with bolts or the like.

  Inside the middle outer cylindrical body 5b, there are provided metal strips 14 and 15 for covering the periphery of the whitening roll 2 and the polishing roll 4 with a set interval and forming a number of punched holes y. The stripping wire mesh of the present embodiment is configured in two upper and lower stages of an upper stripping wire mesh 14 and a lower stripping wire mesh 15, and flange portions 14 b and 15 b are formed on the upper ends of the stripping wire meshes 14 and 15, respectively. The upper flange portion 14b of the demolition wire mesh 14 is detachably coupled together with the flange portion f1 of the upper cylinder body 5a and the middle cylinder body 5b, and the lower flange portion 14c of the upper demolition wire mesh 14 is connected to the lower debris wire mesh 15. The upper flange portion 15b is detachably connected, and the lower flange portion 15c of the lower debonding wire mesh 15 is detachably connected together with the middle outer cylinder 5b and the flange f2 of the lower outer cylinder. In addition, all the connections are connected by bolts (not shown).

  In the present embodiment, the space between the first whitening roll 2a and the upper stripping wire net 14 is the first whitening chamber m, and the space between the second transporting spiral 2b and the top stripping wire 14 is the second transport. The space between the chamber n, the second milling roll 2b and the upper stripping mesh 14 or the lower stripping mesh 15 is the second milling chamber o, and the space between the polishing roll 4 and the bottom stripping mesh 15 is the polishing chamber p. The space between the discharge roll 7 and the discharge wire mesh 16 is defined as a discharge chamber q, and brown rice or polished rice passes through each chamber.

Inside the lower outer cylinder 5c, there are provided a discharge wire net 16 for forming a large number of dust exhaust holes z and a discharge passage 17 for discharging the polished rice to the outside of the outer cylinder 5.
A suction port 22 communicates with the suction fan 23 and is attached to the middle outer cylinder 5b. Then, a suction passage 24 is formed in the outer wall of the middle outer cylinder 5b, the suction passage 24 has a start end side facing the upper portion of the demetalization mesh 14, and a suction passage 24 end side facing the polishing roll 4. In the structure formed at the position and communicating with the end side of the suction passage 24 and the suction port 22, the soot generated in the first whitening chamber m and the second whitening chamber o passes through the punching hole y and is sucked from the suction passage 24. It is the structure sucked to the mouth. The soot sucked from the suction port 22 is accommodated in the soot container 28 via the cyclone 27.

  A plurality of air inlets 29 are formed in the outer cylindrical body 5, and are formed at positions facing the lower portions of the upper and lower debris meshes 14 and 15, respectively. This makes it easy to suck the heel that tends to collect in the lower flange portions 14c and 15c.

L is a gantry and supports the rice mill S and the drive motors M1 and M2.
Next, the process until the brown rice is washed with the rice mill S will be described.
When brown rice is supplied to the supply port 6, the brown rice is supplied into the upper outer cylinder 5 a, hits the dispersion 11, is dispersed throughout the upper outer cylinder 5 a, and is transferred to the first whitening chamber m below by the first transfer helix 3 a. Is done. And the side wall part d3 of the groove part d of the 1st whitening roll 2a acts on the surface of brown rice continuously regularly, and peels the rice bran layer on the surface of brown rice.

  The polished rice that has undergone whitening in the first whitening chamber m is conveyed to the second whitening chamber o by the second conveying spiral 3b and remains on the surface of the polished rice again at the side wall portion e3 of the groove portion e of the second whitening roll 2b. Peel off the layers.

  The polished rice that has been polished in the second polishing chamber o flows into the polishing chamber p, the surface is polished to finish it without washing, and the action of the discharge roll 7 removes dust and dirt slightly attached to the polished rice surface. Then, it is discharged from the discharge chamber q through the discharge passage 17 to the outside of the apparatus.

  The cocoons peeled off by the whitening action of the rice mill roll 2 pass through the culling holes (y) of the demetalization meshes 14 and 15 by the suction action of the suction fan 23, and pass through the suction passage 24 and the suction port 22 from the middle outer cylinder 5 b. It is discharged and stored in the bag storage container 28 via the cyclone 27.

Next, a process of making polished rice having a lower degree of whitening than unwashed rice will be described.
The rotational speed of the first drive shaft 1a is configured to change according to the set milling degree. In the present embodiment, the milling and standard and washing-free rice milling degrees can be set in descending order of milling degree. The 1st drive shaft 1a is the structure which can raise whitening degree by enlarging the force which peels the ridge layer of the 1st whitening roll 2a by making rotation speed high, so that whitening degree becomes high.

On the other hand, the rotational speed of the second drive shaft 1b is fixed so that the finished milling of the second milling roll 2b and the polishing action of the polishing roll 4 are stabilized.
The effects of this embodiment will be described below.

  Even if the length of the whitening roll was increased to improve the whitening ability, the whitening end of the whitening roll was easy to get around the whitening rice, and it was difficult to improve the whitening ability in proportion to the length of the whitening roll. However, the length of the first whitening roll 2a and that of the second whitening roll 2b are shortened by setting the second whitening roll 2b provided for the subsequent process on the same axis to reverse the whitening process. Therefore, the whitening ability can be improved, and the whitening ability can be improved.

  By configuring the second conveying spiral 3b and the second whitening roll 2b to rotate in the reverse direction on the same axis, the second whitening roll 2b is a grain from the opposite direction to the grain conveying direction of the second conveying spiral 3b. By performing the whitening action on the grains, the straw layer on the surface of the rice can be peeled from a different direction from the first whitening roll 2a, and the whitening ability can be improved.

  In order to change the rotation speed of the first whitening roll 2a and to fix the rotation speed of the second whitening roll 2b, the first whitening roll 2a performs rough whitening to a desired degree of whitening, and the second whitening roll 2b and The finish whitening process can be performed with the polishing roll 4.

  By forming a large number of line-shaped grooves d and e parallel to the drive shaft 1 on the outer peripheral surface of the cylindrical whitening roll 2 at set intervals, the side surfaces of the grooves are successively applied to the brown rice filled in the whitening chambers m and n. Since d3 and e3 regularly come into contact with the surface of brown rice or polished rice, the straw layer on the surface of brown rice or polished rice can be peeled off efficiently. Therefore, while it is possible to finish the milled rice with a good finish, since the milling roll only forms a line-shaped groove, the milling roll can be made with a simple structure and at a low cost. Further, the grooves d and e are formed such that the depths d1 and e1 are shallower than the thickness of rice (about 2 mm) (about 0.4 to 0.5 mm), and the widths d2 and e2 are set to the major axis of rice (about 7 mm). It is possible to prevent the rice from entering the groove portions d and e and being clogged by forming the rice in a narrower diameter (about 3 mm) and wider (about 5 mm).

  Moreover, it becomes possible to reduce a whitening load by making it the structure which the groove | channel parts d and e contact | abut regularly on the surface of rice, and peel off a straw layer, It is possible to reduce the grain temperature rise at the time of whitening processing. Power consumption can be reduced. Conventionally, it is difficult to apply a milling load and incomplete milled rice is likely to be generated. In the initial stage of milling or at the end of milling, a stable milling load is applied, so that the milled rice can be finished in a good milling state.

  In addition, the load of the variable speed motor that changes the rotation speed of the first whitening roll 2a can be reduced by separately driving the first whitening roll 2a and the second whitening roll 2b that are particularly loaded. Accordingly, an inverter with a small output can be obtained, and a rice milling apparatus S having an inexpensive configuration can be obtained.

  In addition, even when processing to a degree of whitening lower than that of non-washed rice, the surface can be smoothed by the polishing roll 4 after the whitening process is performed with the whitening degree set by the whitening roll 2, so that the degree of whitening is low. Even when finishing, it can be made into polished rice with good appearance.

Next, a configuration in which the rice milling apparatus S according to the present embodiment is used in a rice milling facility in which a fee is charged and brown rice is washed free will be described.
Reference numeral 30 denotes a charging hopper for charging brown rice. A rotary valve 31 for feeding brown rice to a lower end portion of the charging hopper 30, a first elevator 32 for graining the brown rice fed by the rotary valve 31, and a first lifting machine 32 In the subsequent process, a stone removing machine 33 for removing stones mixed with brown rice, a second elevator 34 for pulverizing the brown rice removed by the stone removing machine 33, and a rice milling apparatus S for whitening the brown rice cerealed by the second elevator 34 And a switching valve 37 for switching the milled rice from the milling apparatus S to the milled rice tank 35 side or the charge tank 36 side for temporary storage, and an operation panel 38 for setting a milling degree by charging a fee. Yes.

  The operation panel 38 is provided with a plurality of selection switches 40 to 44 for selecting the degree of milling. The milling degree of the present embodiment is divided into five types: separation 40, standard 41, upper white 42, non-washed rice 43, and germinated rice 44. The milling degree can be selected, and when the brown rice is put into the feeding hopper 30 and charged, and the selection switch is pressed, the various devices of the rice milling equipment start driving.

  The brown rice in the charging hopper 30 is fed by a set amount by a rotary valve 31, cerealed by a first elevator 32, supplied to a stone remover 33, and a stone removal process is performed. After passing through the stone remover 33, it is supplied to the rice milling device S via the second elevator 34. The milled rice that has been milled by the first milling roll, the second milling roll, and the polishing roll of the milling apparatus S is discharged into a milled rice tank.

By the way, in the rice milling apparatus S, the second drive shaft 1b is fixed at a rotational speed of about 1500 rpm, and the first drive shaft 1a is configured to change the rotation for each set milling degree.
When the distribution 40 is selected, the rotation speed of the first drive shaft 1a is set to about 1800 rpm, about 2100 rpm when the standard 41 is selected, about 2400 rpm when the upper white 42 is selected, and about 2700 rpm when the unwashed rice 43 is selected. Yes.

  In other words, the lower the finishing yield, the higher the rotational speed of the first drive shaft 1a. Moreover, by making the rotation speed of the 1st drive shaft 1a higher than the rotation speed of the 2nd drive shaft 1b, rough milling can be performed with a 1st milling roll, and finishing milling can be smoothly performed with a 2nd milling roll and a grinding | polishing roll. Moreover, stable finishing milling can be performed by fixing the rotation speeds of the second milling roll and the polishing roll.

  When the germinated rice 44 is selected, the rotational speed of the first drive shaft 1a is set to about 1500 rpm, which is the same as that for separating, and the switching valve is switched to the charge tank side. White rice is charged into the charge tank. When all the brown rice in the input hopper is whitened by the rice milling device and charged to the charge tank, the whitened rice in the charge tank is supplied to the rice milling device again through the second elevator and is subjected to the whitening treatment again to the white rice tank. Discharged.

  That is, the milling roll 2 of the present embodiment is not a friction-type milling machine in which rice is rubbed against each other, but is a milling machine that strips the surface layer of the rice and performs the milling process. It is difficult to remove the germ portion k. Therefore, by passing the inside of the rice milling apparatus S twice with a relatively low milling ability as in the present embodiment, it is possible to produce germinated rice having a high degree of milling and a portion of the germ portion k remaining.

  In this embodiment, brown rice is passed through the rice milling device S once to finish it without washing, and it can be finished to various levels of whitening. There is a possibility that it can be applied to washing-free rice with high finishing accuracy.

The figure explaining the inside of the rice milling device S Perspective view showing the whitening roll, conveying spiral, and polishing roll attached to the drive shaft Sectional view seen from the plane of the first milling roll and the upper stripping wire mesh 14 Diagram showing the operation room of the rice milling equipment Process diagram of rice milling equipment External perspective view of rice milling equipment

DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Whitening roll 2a 1st whitening roll 2b 2nd whitening roll 14 Upper stripping wire mesh 15 Lower stripping wire mesh d Groove part of 1st whitening roll e Groove part of 2nd whitening roll

Claims (2)

A large number of linear grooves (d) parallel to the drive shaft (1) are formed at set intervals on the outer peripheral surface of a cylindrical whitening roll (2) that is rotationally driven by the drive shaft (1). Rice milling equipment. The groove (d) is formed with a depth (d1) shallower than the thickness of rice (k), a width (d2) is narrower than the major axis (r1) of rice, and smaller than the minor axis (r2) of rice. 2. The rice milling apparatus according to claim 1, wherein the rice milling apparatus is widely formed .