Milling assisting apparatus and rice milling system

Abstract

To provide a milling auxiliary device capable of intentionally removing hard bran from the surface of unpolished rice by utilizing the power of air when the unpolished rice is pneumatically fed, and a rice milling system using the same.SOLUTION: A rice milling system 1 of the present invention includes a bran separating device 11 installed on a frame 2, first and second hoppers 3 and 4, a first conveying path 7 in which a thermohygrometer 5 and a flow regulating valve 6a are installed, a mixed-phase pipe 8 connected to the downstream side of the first conveying path 7, and a milling assisting device 9 connected to the downstream side of the mixed-phase pipe 8 and the downstream side of the second conveying path 10a, and a first rice milling machine, a second rice milling machine, and a third rice milling machine sequentially connected to the downstream side of the bran separating device 11. 10b 10a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rice milling system used in the field of grain processing, and in particular to an apparatus for milling brown rice using conveying air and a rice milling system equipped with the same. [Background technology]

[0002] Rice that has had the husk removed from the rice kernel is called brown rice, but this brown rice is still covered in a layer of bran, and to turn it into white rice, it needs to be polished to remove the bran layer from the brown rice. Polishing processes are divided into two types: friction methods, which use the friction between the brown rice and a metal part or between the grains themselves, and grinding methods, which polish the brown rice with a grindstone-like roll to remove the bran. In the washing process that follows this polishing process, a method of washing the polished rice by blowing air onto it is already known from the perspective of saving energy. For example, Patent Document 1, entitled "Method and device for air rice transport, air separation of rice and dust, and air rice washing," discloses an invention related to a technology for washing rice by repeatedly pressing the rice against the inner surface of a rice conveying path while blowing and disturbing the polished rice with swirling blown-in air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-1122 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the invention disclosed in Patent Document 1 is designed to remove the small amount of bran and dust remaining on the surface of polished rice, and although hard bran may be accidentally removed from the surface of unpolished rice (brown rice), it is not designed to intentionally remove bran. In other words, the invention disclosed in Patent Document 1 had the problem of not being able to intentionally remove bran from the surface of unpolished rice (brown rice). The present invention has been made in response to such conventional circumstances, and aims to provide a milling auxiliary device that can intentionally remove hard bran from the surface of brown rice by using the power of air when the brown rice is conveyed by air, and a rice milling system using the same. [Means for solving the problem]

[0005] To achieve the above object, the milling auxiliary device according to the first invention is characterized by comprising: a long, cylindrical wire mesh tube into which raw brown rice is supplied together with conveying air from one end; a guide member installed inside the wire mesh tube that guides the raw brown rice downstream while bringing it into contact with the wire mesh tube by disturbing the conveying air; a casing with the wire mesh tube installed inside; and a bran recovery duct connected to the casing that recovers the bran scraped off by the raw brown rice coming into contact with the wire mesh tube. Note that in the first invention, the "guide member that disturbs the conveying air" includes a "guide member that causes the conveying air to swirl in a spiral."

[0006] In the first invention, the raw brown rice agitated with the conveying air inside the wire mesh tube comes into contact with the inner surface of the wire mesh tube, thereby removing the bran from the surface and discharging some of the bran through the mesh to the outside of the wire mesh tube. The bran discharged outside the wire mesh tube is then discharged to the outside of the milling auxiliary device through the bran recovery duct. If the casing is installed so that its central axis is horizontal and the bran recovery duct is located below the casing, the bran between the casing and the wire mesh tube falls toward the bran recovery duct by its own weight.

[0007] The second invention is characterized in that, in the first invention, it is provided with a hollow connecting member that connects the discharge opening provided on the side of the casing and the recovery opening provided on the side of the bran recovery duct, and a suction means installed in the bran recovery duct. In the second invention, in addition to the functions of the first invention, the suction means has the function of sucking the bran inside the connecting member toward the bran recovery duct and discharging the bran accumulated inside the bran recovery duct to the outside. Note that the above function of the suction means is naturally exerted even if the casing is not installed so that the central axis is horizontal, and it cannot be expected that the bran between the casing and the wire mesh tube will fall by its own weight toward the bran recovery duct located below the casing.

[0008] The third invention is characterized in that, in the first invention, the guide member is made of a plate material extending in a spiral shape and is installed inside the wire mesh tube so that the center line of the wire mesh tube and the spiral axis are parallel. In the third invention, in addition to the effect of the first invention, the conveying air flows along the surface of the spirally extending plate material, thereby circling around the spiral axis and proceeding downstream.

[0009] The fourth invention is characterized in that, in the third invention, the guide member is provided with a ventilation hole having a circular outline with the spiral axis passing through the center when viewed in a direction parallel to the center line of the pipe. In the fourth invention, a portion of the conveying air supplied to the inside of the wire mesh tube does not flow along the surface of the guide member but passes through the ventilation holes, and therefore, in addition to the effect of the third invention, the pressure applied to the guide member from the conveying air is reduced by the amount of the conveying air passing through the ventilation holes in the guide member.

[0010] The fifth invention is characterized in that, in the first invention, the guide member is made up of a plurality of members forming part of a spiral plate material, and is installed inside the wire mesh tube so that the conveying air flowing along the surface of this member swirls. In the fifth aspect of the invention, the same effect as that of the third aspect of the invention can be achieved by using a guide member with a simpler structure than that of the third aspect of the invention.

[0011] The sixth invention is characterized in that, in the first invention, the wire mesh tube has a number of slits that are elongated in the longitudinal direction or in a direction inclined relative to the longitudinal direction. In the sixth invention, in addition to the effect of the first invention, the number of slits that can be provided in the circumferential direction of the wire mesh tube is greater than that of a circular opening having the same opening area.

[0012] The seventh invention is a rice milling system that removes bran from raw brown rice using conveying air, and is characterized by comprising: a mixing pipe that mixes the raw brown rice with the conveying air; a blowing means that sends conveying air into the mixing pipe; a milling auxiliary device according to any of the first to sixth inventions that is installed downstream of the mixing pipe and to which the raw brown rice is supplied together with the conveying air; a bran separation device that is installed downstream of the milling auxiliary device; and a rice milling machine that is installed downstream of the bran separation device and to which the raw brown rice that has been processed by the milling auxiliary device is supplied. In the seventh invention, raw brown rice milled by the milling auxiliary device is supplied to the rice milling machine, which has the effect of reducing the energy required for the rice milling process and the load on the rice milling machine. [Effects of the Invention]

[0013] The first invention, which is equipped with a mechanism for rotating the raw brown rice together with the conveying air, differs from the polishing section of conventional rice polishers equipped with a mechanism for forcibly rotating the raw brown rice near the outer surface of the roll by contacting it with agitation protrusions. The mechanism for agitating the raw brown rice is small and simple, which reduces manufacturing costs. Furthermore, because the raw brown rice is agitated together with the conveying air in the first invention, unlike the conventional rice polishers described above, no power is required to rotate a motor. Therefore, the first invention achieves the effect of saving energy during the polishing process. Furthermore, in the first invention, the bran that is scraped off the raw brown rice by contact with the wire mesh tube and then passes through the mesh of the wire mesh tube is less likely to accumulate between the casing and the wire mesh tube, eliminating the need for frequent bran removal from between the casing and the wire mesh tube. This reduces maintenance costs.

[0014] According to the second invention, even if the casing is not installed so that its central axis is horizontal, the bran between the casing and the wire mesh tube is sucked toward the bran recovery duct by the action of the suction means, thereby achieving the effect of the first invention as well as the effect of being able to install the casing in a location where its central axis is not horizontal.

[0015] According to the third invention, in addition to the effect of the first invention, the guide member is made of a single member, and therefore, an effect is achieved in that the manufacturing cost can be reduced.

[0016] In the fourth invention, in addition to the effects of the third invention, a portion of the conveying air supplied inside the wire mesh tube passes through the ventilation holes, reducing the force applied to the guide member from the conveying air, making the plate material less likely to be damaged, thereby extending the life of the guide member.

[0017] According to the fifth invention, in addition to the effect of the first invention, since the guide member is made up of a plurality of members, there is an effect that the degree of freedom in design is increased.

[0018] According to the sixth invention, in addition to the effect of the first invention, by providing more slits in the circumferential direction of the wire mesh tube than in a circular opening having the same opening area, the bran removed from the raw brown rice can be efficiently discharged to the outside.

[0019] According to the seventh aspect of the present invention, the rice polishing machine is less likely to break down, which has the effect of extending its product life and reducing the cost required for rice polishing. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is an external view of a rice polishing system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing the configuration of the rice milling system shown in FIG. 1. [Figure 3] FIG. 2 is a perspective view of the milling assisting device shown in FIG. [Figure 4] FIG. 4 is an exploded perspective view of the casing shown in FIG. 3. [Figure 5] FIG. 4 is a cross-sectional view taken along the line CC in FIG. [Figure 6] FIG. 6 is a perspective view of the guide member shown in FIG. 5. [Figure 7] FIG. 7 is a perspective view showing a modified example of the guide member shown in FIG. 6. [Figure 8] 4 is a view of the connecting member and the bran collecting duct shown in FIG. 3 as seen from the casing side. [Figure 9] FIG. 6 is a perspective view of the wire mesh tube shown in FIG. 5. [Figure 10] FIG. 2 is a cross-sectional view of a milling assisting device, schematically illustrating the behavior of raw brown rice supplied inside. DETAILED DESCRIPTION OF THE INVENTION

[0021] The configuration, actions and effects of the rice milling auxiliary device and the rice milling system using the same of the present invention will be specifically described with reference to Figs. 1 to 10. The brown rice supplied to the rice milling machine includes rice from which some or all of the bran on the surface has been removed by processing with the milling assist device, but in this specification, all brown rice supplied to the rice milling machine, including rice in such a state, will be referred to as raw brown rice. Also, while the following explanation assumes that brown rice is used as the raw material, grains other than rice can also be used as the raw material in the milling assist device and rice milling system using it of the present invention. [Example]

[0022] As shown in Figures 1 and 2, the rice milling system 1 according to an embodiment of the present invention removes bran from raw brown rice using conveying air, and includes a bran separator 11 installed on a stand 2, a first hopper 3 and a second hopper 4, a first conveying path 7 equipped with a thermo-hygrometer 5 and a flow control valve 6a, a mixed-phase pipe 8 connected downstream of the first conveying path 7, a first blower 12 that sends conveying air into the first conveying path 7, and a second conveying path 10a connected downstream of the mixed-phase pipe 8. Furthermore, it is equipped with a milling auxiliary device 9 connected to the downstream side of the second conveying path 10a, a bran recovery duct 18 in which a damper 6b is installed, a second blower 13 which, together with the bran recovery duct 18, constitutes the milling auxiliary device 9, a third conveying path 10b whose upstream side is connected to the milling auxiliary device 9 and whose downstream side is connected to a cyclone-type bran separation device 11, and a first rice polisher 14, a second rice polisher 15 and a third rice polisher 16 which are connected in sequence to the downstream side of the bran separation device 11.

[0023] In the rice milling system 1, raw brown rice is first supplied to the first hopper 3, which is provided with an external discharge valve 3a. That is, after the rice milling process is completed, raw brown rice remaining in the first hopper 3 is discharged outside the machine through the external discharge valve 3a. The second hopper 4 has a rotary valve 4a, and the raw brown rice supplied from the first hopper 3 is stored inside, and is supplied from the rotary valve 4a to the mixed phase pipe 8 when the rice is milled.

[0024] The conveying air sent into the first conveying path 7 by the first blower 12 is supplied to the mixed phase pipe 8 with its flow rate adjusted by the flow rate adjustment valve 6a, and as shown by solid arrows A1 to A5, flows sequentially through the first conveying path 7, mixed phase pipe 8, second conveying path 10a, milling auxiliary device 9, and third conveying path 10b before reaching the bran separation device 11. The raw brown rice supplied from the second hopper 4 to the mixed phase pipe 8 is transported by this conveying air to the milling auxiliary device 9, where it is milled, and then supplied to the bran separation device 11 through the third conveying path 10b. Meanwhile, the bran scraped off from the surface of the raw brown rice during the polishing process moves toward the bran recovery duct 18, and bran discharge air sent into the bran recovery duct 18 by the second blower 13 flows inside the bran recovery duct 18 as shown by the dashed arrow B, transporting the bran scraped off from the surface of the raw brown rice to the downstream side of the bran recovery duct 18.

[0025] The raw brown rice supplied from the milling auxiliary device 9 is mixed with bran and dust (materials other than bran that are generated when part of the raw brown rice is shaved off), but this bran and dust are separated in the bran separator 11, and only the raw brown rice is supplied to the first rice milling machine 14. The first rice polisher 14 is equipped with a grinding module that uses a combination of a knot roll and a circular wire mesh (not shown) to scrape the bran off the surface of the raw brown rice, while the second rice polisher 15 and the third rice polisher 16 are equipped with a friction module that uses a combination of a stirring roll and a polygonal wire mesh (not shown) to remove the bran by friction between the raw brown rice grains. The raw brown rice supplied to the first rice polisher 14 is processed by the grinding module and then supplied to the second rice polisher 15. The raw brown rice processed by the friction module in the second rice polisher 15 is then supplied to the third rice polisher 16, where it is processed by the friction module in the same manner as in the second rice polisher 15.

[0026] In the rice milling system 1 configured as described above, raw brown rice that has been subjected to auxiliary milling processing by the milling auxiliary device 9 is supplied to the first rice miller 14 to the third rice miller 16, thereby reducing the energy required for the rice milling process and the load on the rice millers. As a result, the first rice miller 14 to the third rice miller 16 are less likely to break down, extending their product lifespan and reducing the cost required for the rice milling process. Furthermore, in a rice milling system 1 equipped with the milling auxiliary device 9, it is possible to omit the installation of the first rice miller 14 among the first rice miller 14 to the third rice miller 16. Furthermore, in conventional rice milling systems in which conveying air is used only for the purpose of transporting raw brown rice, the flow rate of the conveying air may be throttled during use. In contrast, in the rice milling system 1 in which conveying air is used for the purposes of transporting and milling raw brown rice, there is no need to throttle the flow rate of the conveying air, and the energy of the conveying air can be used effectively and without waste.

[0027] Here, the milling auxiliary device 9 will be described in detail. As shown in Figures 3 to 5, the milling auxiliary device 9 comprises a long casing 17 consisting of a casing main body 17a having a truncated cone-shaped connecting portion 17b at each axial end of a substantially semi-cylindrical half body 17c, and a substantially semi-cylindrical half body 17d detachably attached to the casing main body 17a, a bran recovery duct 18 arranged parallel to the casing 17, and a funnel-shaped connecting member 19 connecting the casing 17 and the bran recovery duct 18. That is, by removing the half body 17d from the casing main body 17a, maintenance of the components installed inside the casing 17 is possible. Also, the connecting part 17b has a through hole 17e that can be connected to the second conveying path 10a and the third conveying path 10b, which is provided at the center of the truncated cone so that the central axes of the two parts coincide with each other.

[0028] 5 and 6, the milling auxiliary device 9 is equipped with a wire mesh tube 20, which is a long rectangular tube having a fixing portion 21b and is installed inside the casing 17 so that the axial directions of the two tubes are parallel to each other, and a guide member 22, which is made of a spirally extending plate material and is installed inside the wire mesh tube 20 so that the center line of the wire mesh tube 20 and the helical axis 22b are parallel to each other. The guide member 22 is formed with ventilation holes 22a, which have a circular outline with the helical axis 22b passing through the center when viewed in a direction parallel to the center line of the wire mesh tube 20.

[0029] In FIG. 6, the wire mesh tube 20 is indicated by a broken line, and the manner in which the carrier air sent into the wire mesh tube 20 swirls due to the action of the guide member 22 is indicated by a broken arrow. In the guide member 22 having the above structure, a portion of the conveying air supplied into the wire mesh tube 20 flows along the surface of the spiral plate, circling around the spiral axis 22b as shown by the dashed arrow in Figure 6, and proceeding toward the downstream end 20c of the wire mesh tube 20, while the remaining conveying air passes through the ventilation holes 22a and flows toward the downstream end 20c of the wire mesh tube 20. In this way, the guide member 22 is made up of a single member, and can be manufactured inexpensively. Furthermore, in the guide member 22, the pressure applied to the guide member 22 from the conveying air is reduced by the amount that the conveying air passes through the ventilation holes 22a, which is expected to make the plate material less susceptible to damage and extend its lifespan.

[0030] The guide member 22 is not limited to the structure shown in FIG. 6. For example, the guide member 22 may have a structure without ventilation holes 22a. Alternatively, as shown in FIG. 7, a guide member 23 may be used in place of the guide member 22. The guide member 23 is made up of a plurality of members that form part of the spiral plate shown in FIG. 6, and the conveying air flows into the wire mesh tube 20 from the upstream end 20a (see FIG. 7), and then part of the air flows along the surface of the members, causing the conveying air to revolve around the spiral axis 23b as shown by the dashed arrow in FIG. 7. Alternatively, the guide member 22 may have a structure in which a number of flat plate members are randomly arranged inside the wire mesh tube 20.

[0031] In this case, the action and effect of guide member 22 can be similarly achieved with a structure simpler than that of guide member 22. Furthermore, because guide member 23 is composed of multiple components, a high degree of freedom in design can be expected. Furthermore, since the conveying air that does not flow along the surface of the plate passes through ventilation holes 23a and flows toward downstream end 20c of wire mesh tube 20, the pressure applied to guide member 23 from the conveying air is reduced by the amount of conveying air passing through ventilation holes 23a. As a result, the above-mentioned components are less likely to be damaged, and the effect of extending their lifespan is also achieved, similar to that of guide member 22.

[0032] As shown in Figures 5 and 8, the hollow connecting member 19 consists of a pair of side plates 19a, 19a arranged in parallel and each forming an approximately isosceles trapezoidal shape, and a pair of side plates 19b, 19b that connect the ends of the side plates 19a, 19b, and both ends of the side plates 19a, 19b are fixed to the casing 17 and the bran recovery duct 18, respectively, so as to connect the discharge opening 17f provided in the half body 17c of the casing 17 and the recovery opening 18b provided in the side 18a of the bran recovery duct 18.

[0033] As shown in Figures 5 and 9, the wire mesh tube 20 consists of two panel members 21, 21 having numerous holes formed by well-known methods such as punching or pressing, and has a hexagonal cylindrical portion 20b inside which guide member 22 and guide member 23 can be installed. Each of the two panel members 21, 21 comprises a half-split cylindrical portion 21a, which is formed by splitting the cylindrical portion 20b in half, and a fixed portion 21b, and is configured so that one fixed portion 21b can be detachably fixed to the other fixed portion 21b using fastening means such as bolts 24a and nuts 24b, as shown in Fig. 5. For convenience, the bolts 24a, nuts 24b, and bolt insertion holes are not shown in Figs. 1 and 3.

[0034] Furthermore, the half-cylindrical portion 21a has a large number of slits 21c in the form of elongated holes formed in a staggered pattern in a direction that forms a predetermined angle with respect to the longitudinal direction of the panel member 21. In Fig. 9, in order to avoid cluttering the illustration of the panel member 21 that constitutes the wire mesh tube 20, the slits 21c are shown only in some of the half-cylindrical portion 21a. Because the circumferential width of the slits 21c is narrower than that of circular openings having the same opening area, the number of slits 21c that can be provided in the circumferential direction of the wire mesh tube 20 is greater than the number of circular openings. Therefore, many slits 21c can be provided in the circumferential direction of the wire mesh tube 20. This allows the bran removed from the raw material brown rice to be efficiently discharged to the outside. The slits 21c may also be formed long and narrow in the longitudinal direction of the panel member 21. The fixing portion 21b is necessary when connecting a pair of panel members 21 to each other, but if the entire wire mesh tube 20 were installed inside the casing 17, wasted space would be created. Therefore, when the wire mesh tube 20 is assembled inside the casing 17, the fixing portion 21b protrudes from between the half body 17c and the half body 17d, as shown in Figures 3 and 5.

[0035] In the milling auxiliary device 9 having the above-described structure, the raw brown rice is supplied to the mixed-phase pipe 8 and then sent to the second conveying path 10a by the conveying air, and is then supplied to the inside of the wire mesh pipe 20 from the upstream end 20a through the through hole 17e provided in the connection part 17b of the casing 17. As already described using Figure 6, part of the conveying air supplied into the wire mesh tube 20 flows along the surface of the guide member 22 and moves downstream while swirling around the spiral axis 22b (see Figure 6) as shown by the dashed arrow in Figure 6, causing the raw material brown rice 25 to swirl around the spiral axis 22b together with the conveying air as shown by the thick solid arrow in Figure 10. When the raw material brown rice 25 comes into contact with the edge of the slit 21c, bran 26 is scraped off from its surface.

[0036] In this way, in the milling auxiliary device 9, the raw brown rice 25 rotates together with the conveying air, whereas in the milling section of conventional rice mills, for example, the raw brown rice 25 near the outer periphery of the roll is forced to rotate by coming into contact with agitation protrusions. In other words, compared to conventional rice mills, the milling auxiliary device 9 has a smaller and simpler mechanism for rotating the raw brown rice 25, which helps keep manufacturing costs low. Furthermore, because the raw brown rice 25 rotates together with the conveying air in the milling auxiliary device 9, unlike the above-mentioned conventional rice mills, no power is required to rotate a motor. Therefore, the milling auxiliary device 9 can save energy during the milling process.

[0037] 10, the bran 26 scraped off from the raw material brown rice 25 is discharged out of the wire mesh tube 20 through the slits 21c, then moves into the inside of the connecting member 19 through the discharge opening 17f of the casing 17, and further moves into the inside of the bran recovery duct 18 through the recovery opening 18b. The bran 26 accumulated inside the bran recovery duct 18 is then discharged out of the bran recovery duct 18 by the bran discharge air. That is, the bran 26 that has been scraped off from the raw material brown rice 25 and passed through the slits 21c of the wire mesh tube 20 is less likely to accumulate between the casing 17 and the wire mesh tube 20. Therefore, the milling auxiliary device 9 does not require frequent work to remove the bran 26 from between the casing 17 and the wire mesh tube 20, which has the effect of reducing maintenance costs.

[0038] 1, when the milling assisting device 9 is installed so that the central axis of the casing 17 is horizontal, the bran 26 that moves from the casing 17 into the connecting member 19 falls under its own weight and accumulates inside the bran recovery duct 18. However, in the milling assisting device 9, the bran discharge air flowing inside the bran recovery duct 18 discharges the bran 26 that has accumulated inside the bran recovery duct 18 to the outside, and also acts to suck the bran 26 inside the connecting member 19 toward the bran recovery duct 18. Therefore, the bran 26 inside the connecting member 19 is promoted to move toward the bran recovery duct 18 by the above-mentioned suction action.

[0039] That is, in the milling auxiliary device 9, even if the casing 17 is not installed so that its central axis is horizontal and it cannot be expected that the bran 26 between the casing 17 and the wire mesh tube 20 will fall toward the connecting member 19 due to its own weight, the above-mentioned suction action of the bran discharge air will naturally be exerted, and the bran 26 between the casing 17 and the wire mesh tube 20 will be reliably collected into the bran collection duct 18 through the inside of the connecting member 19. Therefore, the milling auxiliary device 9 can be installed even in a place where the central axis of the casing 17 is not horizontal.

[0040] The milling auxiliary device of the present invention is not limited to the structure shown in Figures 1 to 9. For example, the cylindrical portion 20b of the wire mesh tube 20 may be a square tube having a shape other than a hexagon, or may be a cylinder. In such cases, the above-mentioned functions and effects of the wire mesh tube 20 are similarly exhibited. Furthermore, the slits 21c provided in the panel member 21 may be formed to be elongated in the direction in which the conveying air guided by the guide member 22 flows.

[0041] Furthermore, guide member 22 and guide member 23 may have a structure in which a plurality of protrusions are formed on the surface thereof by elongated holes like slits 21c of panel member 21 or embossing, etc. In addition, the guide member installed inside wire mesh tube 20 need only have the function of disturbing the conveying air, so it is not limited to structures such as guide member 22 and guide member 23 and can be modified as appropriate. Furthermore, such guide members may have a structure in which ventilation holes are actually formed.

[0042] 2 functions as a suction means for sucking the bran 26 inside the connecting member 19 toward the bran recovery duct 18 by sending bran discharge air into the bran recovery duct 18, but a suction blower can also be installed downstream of the bran recovery duct 18 and used as the suction means instead of the second blower 13. In this case, however, it is desirable to operate the damper 6b installed in the bran recovery duct 18 to prevent air from flowing into the bran recovery duct 18 from the upstream side. [Industrial Applicability]

[0043] The present invention can be applied to rice milling machines used in the field of grain processing. [Explanation of symbols]

[0044] 1...Rice milling system 2...Frame 3...First hopper 3a...External discharge valve 4...Second hopper 4a...Rotary valve 5...Thermo-hygrometer 6a...Flow rate control valve 6b...Damper 7...First conveying path 8...Mixed-phase pipe 9...Milling auxiliary device 10a...Second conveying path, 10b...Third conveying path 11...Bran separator 12...First blower 13...Second blower 14...First rice miller 15...Second rice miller 16...Third rice miller 17...Casing 17a...Casing body 17b...Connection part 17c, 17d...Half body 17e...Through hole 17f...Discharge opening 18...Bran recovery duct 18a...Side surface 18b...Recovery opening 19...Connection member 19a, 19b...Side plate 20...Wire mesh pipe 20a...Upstream end portion 20b...Cylindrical portion 20c...Downstream end portion 21...Panel member 21a...Half-cylindrical portion 21b...Fixed portion 21c...Slit 22, 23...Guide member 22a, 23a...Ventilation hole 22b, 23b...Spiral shaft 24a...Bolt 24b...Nut 25...Raw material brown rice 26...Bran

Claims

1. a long, cylindrical wire mesh tube into which raw brown rice is supplied from one end together with conveying air; a guide member that is installed inside the wire mesh tube and that disturbs the conveying air to guide the raw material brown rice downstream while bringing it into contact with the wire mesh tube; a casing in which the wire mesh tube is installed; The milling auxiliary device is characterized by comprising a bran recovery duct connected to the casing for recovering bran scraped off when the raw brown rice comes into contact with the wire mesh tube.

2. a hollow connecting member that connects a discharge opening provided on a side surface of the casing and a recovery opening provided on a side surface of the bran recovery duct; 2. The milling auxiliary device according to claim 1, further comprising a suction means disposed in the bran recovery duct.

3. The guide member is made of a plate member extending in a spiral shape, 2. The milling auxiliary device according to claim 1, wherein the milling auxiliary device is installed inside the wire mesh tube so that the center line of the wire mesh tube and the spiral axis are parallel to each other.

4. 4. The milling auxiliary device according to claim 3, wherein the guide member is provided with a ventilation hole having a circular outline with the spiral axis passing through its center when viewed in a direction parallel to the center line of the tube.

5. 2. The milling auxiliary device according to claim 1, wherein the guide member is made up of a plurality of members that form part of a spiral plate material, and is installed inside the wire mesh pipe so that the conveying air flowing along the surface of these members advances downstream while swirling.

6. 2. The milling auxiliary device according to claim 1, wherein the wire mesh tube has a number of slits formed in a longitudinal direction or in a direction oblique to the longitudinal direction.

7. A rice milling system that removes bran from raw brown rice using conveying air, a mixing pipe that mixes the raw material brown rice and the conveying air; a blower for blowing the carrier air into the mixed-phase pipe; The milling auxiliary device according to any one of claims 1 to 6, which is installed downstream of the mixed-phase pipe and to which the raw material brown rice is supplied together with the conveying air; a bran separator installed downstream of the milling auxiliary device; A rice milling system characterized by comprising: a rice milling machine that is installed downstream of the bran separation device and to which the raw brown rice processed by the milling auxiliary device is supplied.

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