Screen structure and its assembly method

Abstract

This invention provides a screen structure that can improve the bran removal performance of a bran removal wire mesh tube. [Solution] A screen structure comprising a wire mesh tube for removing bran in a grain milling machine, comprising a screen 2 having a large number of bran removal holes, a feed plate for restricting the movement of grains, and a holder 4A disposed on the outer surface of the screen 2 and detachably fixing the feed plate on the inner surface of the screen 2.

Description

Technical Field

[0001] The present invention relates to a screen structure used in a rice milling machine and an assembly method thereof.

Background Art

[0002] Conventionally, there are two types of grinding rice milling machines: vertical and horizontal. In both types, a grinding type polishing roll, which is a grindstone, is axially mounted on the main shaft inside the bran removing wire mesh cylinder. The space between the bran removing wire mesh cylinder and the grinding type polishing roll is used as a polishing chamber, with one end connected to the grain supply section and the other end connected to the grain discharge section. As a prior application related to the above grinding rice milling machine, for example, Patent Document 1 shown below is known.

[0003] Patent Document 1 discloses an invention related to a rice polishing device under the name of "rice polishing device". The rice polishing device disclosed in Patent Document 1 fixes a downward feeding grain conveying spiral on the upper outer periphery of a vertically rotating main shaft and a friction type rice polishing roll on the lower outer periphery. The outer periphery of the friction type rice polishing roll is surrounded by a lower bran removing cylinder to form a downward flowing friction rice polishing chamber between the friction type rice polishing roll and the lower bran removing cylinder. The outer periphery of the downward feeding grain conveying spiral is surrounded by a concentric rotating cylinder, and a grinding type rice polishing roll is fixed on the outer periphery of the rotating cylinder. The outer periphery of the grinding type rice polishing roll is surrounded by an upper bran removing cylinder to form an upward grinding rice polishing chamber at a higher position than the downward flowing friction rice polishing chamber between the grinding type rice polishing roll and the upper bran removing cylinder. In the rice polishing device that guides the rice grains initially polished in the upward grinding rice polishing chamber to the downward flowing friction rice polishing chamber for finish polishing, a multi - groove spiral for grain rising is provided on the inner surface of the upper bran removing cylinder, and the lower end of the upper bran removing cylinder is positioned higher than the upper end of the lower bran removing cylinder to facilitate the replacement of the lower bran removing cylinder.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] The multi-strand spiral (reference numeral 54 shown in Figure 6 of Reference Document 1) provided on the inner surface of the upper bran removal cylinder of the rice polishing apparatus disclosed in Patent Document 1 is similarly provided on the inner surface of the bran removal cylinder of conventional vertical or horizontal grinding type grain polishing machines. Furthermore, the multi-spindle helix described above is fixed by welding, for example, as shown in paragraphs 0018-0020 of Patent Document 2.

[0006] When multi-threaded spirals (protrusions) were attached to the inner surface of the bran removal cylinder by welding as described above, the following problems occurred: 1. Steps were created inside the screen, 2. Distortion occurred in the bran removal cylinder due to heat, and 3. Work became difficult. In particular, when steps were created inside the screen, the airflow around them was disturbed, making it easy for bran to accumulate, which reduced the bran removal efficiency of the bran removal cylinder. In addition, when the protrusions were fixed by welding, the grains being milled would collide with the welded area, causing bran to adhere to it, which presented a challenge in efficiently discharging the bran into the bran removal chamber.

[0007] Furthermore, another challenge was that the welding process for the protrusions on the rice bran removal cylinder was extremely complicated, making it difficult to improve the productivity of the cylinder itself.

[0008] This invention was made to address the aforementioned conventional circumstances, and its purpose is to provide a screen structure that can improve the bran removal performance of a bran removal wire mesh tube. Furthermore, another object of the present invention is to provide a screen structure that can improve the productivity of rice bran removal wire mesh tubes. [Means for solving the problem]

[0009] The first invention for solving the above problems is a screen structure that constitutes a bran removal wire mesh cylinder in a grain milling machine, characterized by comprising: a screen having a large number of bran removal holes; a feed plate that restricts the movement of grains; and a holder that is disposed on the outer surface of the screen and detachably fixes the feed plate on the inner surface of the screen.

[0010] In the first invention of the above configuration, the screen discharges bran through the bran removal holes. The feed plate regulates the direction of grain movement within the milling chamber. The holder is positioned on the outer surface of the screen and detachably secures the feed plate to the inner surface of the screen. As a result, in the first invention, turbulence in the airflow is less likely to occur on the inner side (curved concave side) of the screen structure, so the rice bran can be smoothly discharged from the inner side to the outer side (curved convex side) of the screen. Furthermore, in the first invention, since there are no protrusions other than the feed plate on the inner surface (curved concave side) of the screen structure, bran is less likely to adhere to the inner surface of the screen structure, and therefore less bran remains in the polishing chamber.

[0011] The second invention is the same as the first invention described above, wherein the screen is provided with a plurality of insertion holes in the thickness direction, the feed plate comprises a guide portion that extends in a rib-like manner in the circumferential direction of the rice bran removal wire mesh tube on the inner surface of the screen, and a plurality of projections that are inserted into each insertion hole from the inner surface to the outer surface of the screen, and the holder is attached to the projections so as to be in a position to prevent the projections from coming out of the insertion holes.

[0012] In the second invention with the above configuration, when the projection formed on the feed plate is inserted into the insertion hole provided in the screen, the projection protrudes from the outer surface of the screen. At this time, the guide portion is held upright on the inner surface of the screen. The guide portion of the feed plate restricts the movement of grain on the inner surface of the screen. The protrusions on the outer surface of the screen are used as mounting points for holders. The holder is detachably mounted on a protruding part on the outer surface of the screen, and serves as a retaining point for the feed plate.

[0013] The third invention is the second invention described above, characterized in that each projection has a slit hole that penetrates in a direction substantially parallel to the center line of the rice bran removal wire mesh tube, the portion of each projection that protrudes above the outer surface of the screen, and the holder has a flat claw portion that is inserted into each slit hole and a connecting portion that integrally connects the base side of the claw portion.

[0014] In the third invention of the above configuration, the slit hole formed in the projection of the feed plate is used as an insertion hole for the claw portion provided in the holder. The claw portion of the holder is inserted into the aforementioned slit hole, preventing the projection of the feed plate from coming out of the screen insertion hole. The connecting section integrates multiple claw sections, allowing for simultaneous insertion and removal of the claw sections into the slit holes. In other words, according to the third invention, compared to the case where each retaining structure is individually attached to the slit holes of the feed plate, the work of fixing the feed plate to the screen or removing the feed plate from the screen can be simplified.

[0015] The fourth invention is the third invention described above, characterized in that at least one of the multiple claw portions connected by the connecting portion has a slit formed therein that penetrates the thickness direction of the claw portion and allows a part of the planar area of ​​the claw portion to be bent.

[0016] In the fourth invention with the above configuration, after inserting the claw portion into the slit hole of the feed plate, it becomes easier to bend a part of the planar area of ​​the claw portion where the slit is formed. In this case, it is possible to make it difficult for the claw portion to pass through the slit hole of the feed plate. That is, it is possible to make it difficult to remove the holder from the feed plate. Also, in the fourth invention, by temporarily restoring the bent claw portion to its original shape, the claw portion of the holder can be removed from the slit hole of the feed plate. Therefore, according to the fourth invention, while significantly reducing the risk that the feed plate unintentionally detaches from the screen during use of the bran-removing wire mesh cylinder, the feed plate can be removed from the screen when necessary.

[0017] The fifth invention is the above-described third or fourth invention, wherein all of the plurality of claw portions connected by the connecting portion are inserted into the slit holes in any one feed plate.

[0018] In the fifth invention having the above configuration, the attachment or detachment of any one feed plate to the screen can be performed using one holder. Thereby, the assembly work of the screen structure according to the fifth invention can be performed easily and quickly.

[0019] The sixth invention is the above-described third or fourth invention, wherein the screen structure includes a plurality of feed plates, and the plurality of claw portions connected by the connecting portion are inserted into the slit holes in different feed plates, respectively.

[0020] In the sixth invention having the above configuration, the attachment or detachment of any one feed plate to the screen can be performed using a plurality of holders. Also, in the sixth invention, the attachment or detachment of the plurality of feed plates to the screen can be performed collectively. Thereby, the assembly work of the screen structure according to the sixth invention can be performed easily and quickly.

[0021] The seventh invention is the third or fourth invention described above, characterized in that both the feed plate and the holder are flat metal plates.

[0022] In the seventh invention with the above configuration, the feed plate and holder can be manufactured simply by cutting out a metal plate using laser processing or the like. This reduces the effort and cost involved in manufacturing the screen structure, which is the seventh invention.

[0023] The eighth invention is a method for assembling a screen structure, which constitutes a screen structure for a rice bran removal wire mesh tube in a grain milling machine, characterized in that the feed plate is positioned on the inner surface of the screen by inserting the projection of the feed plate through the insertion hole provided in the screen from the inner surface to the outer surface of the screen, and then a holder is attached from the outer surface of the screen to the projection that is protruding from the outer surface of the screen so as to prevent the projection from coming out of the insertion hole, thereby fixing the feed plate to the screen.

[0024] In the eighth invention with the above configuration, it is possible to achieve a state in which there are no protrusions other than the feed plate on the inner surface of the screen. In other words, in the eighth invention, the holder for fixing the feed plate to the screen is arranged on the outer surface of the screen. As a result, in the eighth invention, not only is it less likely for turbulence to occur in the airflow on the inner side (curved concave side) of the screen structure, but it is also less likely for rice bran to adhere to the inner side of the screen structure, so that the rice bran can be smoothly discharged from the inner side to the outer side (curved convex side) of the screen. [Effects of the Invention]

[0025] According to the first, second, and eighth inventions described above, a screen structure with excellent bran removal properties can be provided. Therefore, when a wire mesh tube for removing bran is constructed using such a screen structure and used in a grain milling machine, the milling of grain can be performed efficiently. Furthermore, according to the first, second, and eighth inventions described above, the frequency of maintenance on the grain milling machine can be reduced, and the risk of the grain milling machine malfunctioning can also be reduced. Therefore, according to the first, second, and eighth inventions, a high-performance grain milling machine can be provided.

[0026] According to the third and fifth to seventh inventions, the process of fixing the feed plate to the screen or removing the feed plate from the screen can be simplified. This improves the productivity of the screen structures, which are the inventions of the third and fifth through seventh inventions, and also makes their maintenance easier. As a result, the productivity of a grain mill equipped with a screen structure using a wire mesh tube for removing bran, which is the third and fifth to seventh inventions, can be improved, and its maintenance can also be made easier.

[0027] According to the fourth invention, the holder can be made less likely to detach from the feed plate, and the holder can be easily removed from the feed plate when necessary. Therefore, the reliability of the grain mill equipped with a screen structure-based wire mesh cylinder for removing bran, which is the fourth invention, can be improved during operation, and its maintenance can also be made easier. [Brief explanation of the drawing]

[0028] [Figure 1] This is a schematic cross-sectional view showing the overall configuration of a grinding-type vertical grain milling machine. [Figure 2] This is a perspective view of a vertical grinding-type grain mill with a portion of the screen structure removed from the milling section. [Figure 3] This is a perspective view of the screen structure according to Example 1. [Figure 4] This is a plan view of the screen structure according to Example 1, seen from the inner side (curved concave side). [Figure 5] This is a plan view of the screen structure according to Example 1, as seen from the outer side (curved convex side). [Figure 6] This is a perspective view of the screen structure according to Example 1 in an disassembled state. [Figure 7] (7A) is a plan view of the feed plate of the screen structure according to Example 1, and (7B) is a plan view of the holder of the same screen structure. [Figure 8] This is a partial perspective view showing the assembly procedure of the screen structure according to Example 1. [Figure 9] This is a partial perspective view showing the assembly procedure of the screen structure according to Example 1. [Figure 10] This is a partial perspective view showing the assembly procedure of the screen structure according to Example 1. [Figure 11] (11A) is a partial perspective view showing the holder of Example 1 before the claw portion is bent, and (11B) is a partial perspective view showing the holder with the claw portion bent. [Figure 12] This is a perspective view of a horizontal grinding-type grain mill with a portion of the screen structure removed from the milling section. [Figure 13] This is a perspective view of the screen structure according to Example 2. [Figure 14] This is a plan view of the screen structure according to Example 2, seen from the inner side (curved concave side). [Figure 15] This is a perspective view of the screen structure according to Example 2 in an disassembled state. [Figure 16] (16A) is a plan view of the feed plate of the screen structure according to Example 2, and (16B) is a perspective view of the holder of the same screen structure. [Figure 17] This is a partial perspective view showing the assembly procedure for the screen structure according to Example 2. [Figure 18] This is a partial perspective view showing the assembly procedure for the screen structure according to Example 2. [Figure 19] This is a partial perspective view showing the assembly procedure for the screen structure according to Example 2. [Figure 20] (20A) is a partial perspective view showing the holder before the claw portion of the modified example of Example 2 is bent, and (20B) is a partial perspective view showing the holder with the claw portion bent. [Modes for carrying out the invention]

[0029] A screen structure and its assembly method according to an embodiment of the present invention will be described in detail with reference to Figures 1 to 20. Note that the following description of preferred embodiments is essentially illustrative.

[0030] Prior to describing the screen structure and assembly method according to an embodiment of the present invention (hereinafter referred to as "this embodiment"), a grinding-type grain polishing machine equipped with a bran-removing wire mesh cylinder having the screen structure according to this embodiment will be described with reference to Figures 1 and 2. Although Figure 1 illustrates the structure of a grinding-type vertical grain mill, the structure of the grinding-type horizontal grain mill, which will be shown later, is essentially the same.

[0031] In this embodiment, the grinding-type vertical grain milling machine 50A has a main shaft 53 erected in the approximate center of the main body base 52 using an upper bearing section 54 and a lower bearing section 55, and a grain milling section 51A equipped with a grinding-type polishing roll 56 (hereinafter referred to as "polishing roll 56") is provided directly above the upper bearing section 54. Furthermore, a motor base 57 equipped with a motor 58 is attached to the main body base 52, and the spindle 53 is connected to the motor 58 via a spindle pulley 60, a V-belt 61, and a motor pulley 59. In other words, the spindle 53 is driven by the motor 58.

[0032] The polishing roll 56 is a stack of multiple cylindrical grinding discs 62 attached to the main spindle 53, with spacers 63 interposed between each grinding disc 62. Furthermore, abrasive grains of a grinding wheel, which function as a cutting edge for grinding, are integrally fixed to the entire circumferential surface of the grinding disc 62 by means of sintering or other methods. Furthermore, the peripheral surface of the spacer 63 interposed between the multiple grinding discs 62 may be equipped with air nozzles (not shown). In this case, air taken in from outside the grinding-type vertical grain mill 50A can be injected from the air nozzles as a bran-removing airflow, thereby accelerating bran removal during milling. In addition, a feed roll 64 for the raw material grains (not shown) is attached to the main shaft 53 at the upper end of the polishing roll 56. A screw blade 65 is provided on the outer surface of this feed roll 64, and the rotation of this screw blade 65 feeds the grains into the polishing chamber 67.

[0033] Furthermore, rice bran removal wire mesh tubes 66A (Figure 1) are erected around the rice polishing roll 56 at desired intervals. The space formed between these rice bran removal wire mesh tubes 66A and the rice polishing roll 56 is the rice polishing chamber 67.

[0034] In this embodiment, as shown in Figure 2, the rice bran removal wire mesh tube 66A is formed by attaching the screen structure 1A according to this embodiment to the operating frame 10A, and then stretching it between four support columns 68 erected around the polishing roll 56, so that the four screen structures 1A are integrated into a cylindrical shape via the support columns 68. The outside of the bran-removing wire mesh cylinder 66A is further equipped with an arc-shaped bran-removing chamber cover 69 that spans between the four support columns 68, as shown in Figure 1, and the space formed between this bran-removing chamber cover 69 and the bran-removing wire mesh cylinder 66A is the bran-removing chamber 70. Furthermore, each support column 68 is covered with a support column cover 71.

[0035] A supply cylinder 72, which guides the grain raw material into the polishing chamber 67, is mounted on the upper end of a support column 68. This supply cylinder 72 is positioned to surround the feed roll 64, which is located at the upper end of the polishing roll 56. Furthermore, a hopper cylinder 73 is provided above the supply cylinder 72, and a raw material inlet 74 is provided on the upper wall of this hopper cylinder 73. Furthermore, a hollow cone-shaped guide body 75 is provided inside the hopper cylinder 73, and a supply amount adjustment device 77 consisting of two perforated rotating plates that rotate by operating an adjustment lever 76 is provided on top of it.

[0036] At the lower end of the polishing chamber 67, there is an outlet 78 which is a cut-out section of the bran removal wire mesh tube 66A, and a discharge trough 79 is connected to this outlet 78. Furthermore, the discharge trough 79 is equipped with a lid 81 that is operated by, for example, a weight lever 80. In this embodiment, the case in which the lid 81 is biased by the weight lever 80 is described as an example, but the means for biasing the lid 81 may be air pressure or the like, or the milled grain may be discharged from the lid 81 without any load.

[0037] Furthermore, the polishing chamber 67 is provided with polishing chamber resistors 82 that protrude toward the circumferential surface of the polishing roll 56. These polishing chamber resistors 82 are provided on each of the support columns 68. The polishing chamber resistor 82 is a long, plate-like structure that extends in the axial direction of the polishing roll 56. Furthermore, the polishing chamber resistor 82 is biased toward the circumferential side of the polishing roll 56 by an air pressure application mechanism (not shown), thereby restricting the movement of grains in the polishing chamber 67 in the circumferential direction of the polishing roll 56.

[0038] Furthermore, below the bran removal chamber 70 in the grinding-type vertical grain mill 50A, an annular bran collection chamber 83 is provided, and a scraping blade 84 that rotates integrally with the polishing roll 56 is installed inside this bran collection chamber 83. Furthermore, a bran discharge port (not shown) is provided at the bottom of the bran collection chamber 83, and the bran is discharged from this port. Furthermore, a bran collection fan 85 is provided at the bottom of the main shaft 53, and the bran discharged from the polishing chamber 67 to the bran removal chamber 70 via the bran removal wire mesh tube 66A is discharged outside the grinding-type vertical grain mill 50A by drawing in air from a supply port or the like.

[0039] When milling grain using the grinding-type vertical grain milling machine 50A shown in Figure 1, the grain (e.g., brown rice) is supplied from a chute (not shown in the figure) to the input port 74 (see Figure 1). At this time, the flow rate of the grain (e.g., brown rice) can be appropriately adjusted by operating the adjustment lever 76. Furthermore, the grains that flow into the hopper cylinder 73 are evenly dispersed in the circumferential direction by the guide body 75 and supplied to the upper part of the polishing chamber 67. After this, the grains supplied to the polishing chamber 67 flow actively (revolving and rotating) in a relatively low-pressure environment due to the rotation of the polishing rolls 56, and their surface layer is scraped off as they come into contact with the circumferential surface of the polishing rolls 56.

[0040] Furthermore, the grains inside the polishing chamber 67 are biased to protrude towards the circumferential side of the polishing roll 56 by a polishing chamber resistance body 82, which is installed inside each support column 68 and is not shown. This resistance body prevents the circumferential movement of the polishing roll 56. This action causes the grains to accumulate on the circumferential surface of the polishing roll 56, and the grinding action by the polishing roll 56 at that time is sufficient to act on the grains, and the bran in the grooves on the back side of the grains can also be sufficiently removed. [Examples]

[0041] The screen structure according to Example 1 will be described with reference to Figures 1 to 11. The screen structure 1A according to Embodiment 1 of this embodiment comprises a screen 2 formed by dividing a wire mesh cylinder, which has numerous bran removal holes 2b formed therein for discharging bran generated in the polishing chamber 67 of a grinding-type vertical grain mill 50A to a bran removal chamber 70, into n sections in a vertical manner (for example, 4 sections); a feed plate 3 that protrudes from the inner surface (curved concave side) of the screen 2 to restrict the movement of grains in the polishing chamber 67; and a holder 4A that is arranged on the outer surface (curved convex side) of the screen 2 and detachably fixes the feed plate 3 to the inner surface of the screen 2.

[0042] More specifically, as shown in Figures 3 to 7, screen 2 is a wire mesh in which numerous elongated holes, which are bran-removing holes 2b, are formed in the thickness direction of the main body portion 2a, which is a curved plate body obtained by dividing a metal cylinder, such as stainless steel, into n sections (for example, 4 sections) in a vertical manner. In the actual screen 2, the bran removal holes 2b are formed over almost the entire area of ​​the main body 2a, but in the drawings of this embodiment, only a portion of the bran removal holes 2b are shown. Furthermore, the main body portion 2a of the screen 2 has insertion holes 2c formed in the thickness direction, separate from the bran removal holes 2b, for inserting the projections 3c of the feed plate 3. Furthermore, the screen 2 is provided with flat mounting plate portions 2d on each of its side edges, which are parallel to the center line when the rice bran removal wire mesh tube 66A is formed, and countersunk bolts 12 for attaching the screen structure 1A to the frame 10A are provided at desired locations on these mounting plate portions 2d. Furthermore, the bolt insertion holes 2e formed at desired locations on the mounting plate portion 2d are used when fixing the screen structure 1A to the support column 68 with bolts 11.

[0043] As shown in Figures 6 and 7A, the feed plate 3 is a flat plate formed by cutting out a metal plate, such as stainless steel, using laser processing or the like. Furthermore, the feed plate 3 includes a long, slender, flat guide portion 3a (see Figure 4) that protrudes from the inner surface of the screen 2 (towards the polishing chamber 67) when attached to the screen 2, and a plurality of flat projections 3c are provided at desired intervals on the end face 3b of this guide portion 3a, that is, on the end face 3b that is positioned opposite the inner surface of the screen 2 when the feed plate 3 is attached to the screen 2. In addition, each projection 3c has a slit hole 3d formed in the thickness direction. The slit holes 3d formed in each of the protrusions 3c are used to attach the holder 4A.

[0044] As shown in Figures 6 and 7A, the holder 4A is also a flat plate formed by cutting out a metal plate, such as stainless steel, using laser processing or the like. As shown in Figures 3 to 7B, the holder 4A includes a flat claw portion 4a that is inserted into the slit holes 3d of each protrusion 3c that protrudes from the outer surface of the screen 2 when the feed plate 3 is attached to the screen 2, and an elongated flat connecting portion 4c1 that integrally connects the base 4b side of each claw portion 4a. In other words, in holder 4A, claw portions 4a are attached to the long side of the elongated flat connecting portion 4c1 at desired intervals. More specifically, in holder 4A, each claw portion 4a is positioned such that the direction from the base 4b to the tip of the claw portion 4a is perpendicular to the longitudinal direction of the connecting portion 4c1. Therefore, in holder 4A, multiple claw portions 4a are arranged in a sawtooth pattern along the long side of the connecting portion 4c1. When using the holder 4A described above, any one feed plate 3 can be fixed to the screen 2 using one holder 4A.

[0045] Furthermore, at least two of the multiple claw portions 4a provided on the holder 4A, and more preferably the claw portions 4a provided on the holder 4A near both ends in the longitudinal direction of the connecting portion 4c1, have slits 4d1 formed therein that extend toward the center in the width direction and penetrate through the thickness direction of the plate body constituting the claw portion 4a. The method of using this slit 4d1 will be explained in detail later, with reference to Figure 11. Furthermore, as described above, since the holder 4A is a flat metal plate, it can be bent to conform to the curved shape of the outer surface of the screen 2 during use.

[0046] The assembly method of the screen structure 1A according to Embodiment 1 will be described with reference to Figures 8 to 11. When assembling the screen structure 1A according to Example 1, first, as shown in Figure 8, the feed plate 3 is placed on the inner surface (curved concave side) of the screen 2, and then the respective protrusions 3c protruding from the feed plate 3 are inserted into the respective insertion holes 2c formed in the screen 2. As a result, as shown in Figure 9, the protrusions 3c of the feed plate 3 protrude from each insertion hole 2c onto the outer surface of the screen 2. Subsequently, as shown in Figures 9 and 10, the holder 4A can be attached to the feed plate 3 by inserting the claw portion 4a of the holder 4A into the slit hole 3d formed in the projection 3c that protrudes from the outer surface of the screen 2. As a result, the individual claws 4a inserted into the slit holes 3d of the feed plate 3 prevent the projections 3c of the feed plate 3 from coming out of the insertion holes 2c of the screen 2. To remove the feed plate 3 from screen 2, simply reverse the above procedure.

[0047] In the state shown in Figure 10, it cannot be said with certainty that there is absolutely no concern that the claw portion 4a of the holder 4A may come off the slit hole 3d of the feed plate 3 due to vibrations during the operation of the grinding-type vertical grain mill 50A. In light of these circumstances, after inserting the claw portion 4a of the holder 4A into the slit hole 3d of the feed plate 3, the flat portion of the claw portion 4a with the slit 4d1 formed thereon can be bent, as shown in Figures 11A and 11B, to more reliably prevent the claw portion 4a from coming out of the slit hole 3d. In other words, this prevents the holder 4A from unintentionally detaching from the feed plate 3.

[0048] Furthermore, as shown in Figure 11B, the bent claw portion 4a can be temporarily restored to its original shape, allowing it to be removed from the slit hole 3d of the feed plate 3. This allows the feed plate 3 to be removed from the screen 2 when necessary.

[0049] In addition, in the holder 4A, even if only a slit 4d1 is formed in at least one claw portion 4a and that claw portion 4a is bent, it is sufficient to prevent the holder 4A from coming off the feed plate 3. However, it is more preferable to form slits 4d1 in at least two of the multiple claw portions 4a provided on the holder 4A. Furthermore, by forming a slit 4d1 in the claw portion 4a located near the longitudinal end of the connecting portion 4c in the holder 4A, the stability of the feed plate 3 when it is fixed can be further enhanced.

[0050] As shown in Figure 9, in the screen structure 1A according to Embodiment 1, when the feed plate 3 is attached to the screen 2, the length direction of the slit hole 3d formed in the projection 3c that protrudes from the outer surface of the screen 2 is along or coincides with the curved shape (arc) of the outer surface of the screen 2. As a result, by sliding the holder 4A toward the projection 3c of the feed plate 3 with the connecting portion 4c1 of the holder 4A curved to follow the outer surface (arc) of the screen 2 (Figures 9 and 10), the claw portions 4a provided on the holder 4A can be simultaneously inserted into the individual slit holes 3d of the feed plate 3. At this time, the plate surface of the connecting portion 4c1 of the holder 4A will be in a state where it overlaps with the outer surface of the screen 2.

[0051] Furthermore, in the screen structure 1A according to Example 1, as shown in Figures 4 and 5, when the feed plate 3 is attached to the screen 2, the longitudinal direction of the guide portion 3a is slightly inclined with respect to the circumferential direction of the rice bran removal wire mesh cylinder 66A. Therefore, when the feed plate 3 is attached to the screen 2, the direction of penetration of the slit hole 3d does not perfectly coincide with the centerline direction of the rice bran removal wire mesh cylinder 66A, and is slightly inclined with respect to this centerline. Therefore, the direction in which the slit holes 3d penetrate when the feed plate 3 is attached to the screen 2 is described as being "approximately parallel" to the centerline direction of the rice bran removal wire mesh cylinder 66A.

[0052] According to the screen structure 1A of the embodiment 1 described above, it is possible to achieve a state in which there are absolutely no protrusions other than the guide portion 3a on the inner surface of the screen 2. In other words, according to screen structure 1A, all the fixing structures for securing the feed plate 3 to the screen 2 can be placed on the outer surface of the screen 2. In this case, when the screen structure 1A according to Example 1 is used to construct the bran removal wire mesh cylinder 66A and is used in the grinding-type vertical grain milling machine 50A, turbulence in the airflow within the polishing chamber 67 is less likely to occur, allowing the bran to be smoothly discharged from the polishing chamber 67 to the bran removal chamber 70. In other words, the bran removal performance of the bran removal wire mesh cylinder 66A can be improved. In addition, with screen structure 1A, since there are no protrusions other than the guide portion 3a on the inner surface of screen 2, it is possible to prevent grains being milled from colliding with the stepped portions formed on the inner surface of screen 2, as in the conventional technology, and preventing bran from adhering to them. As a result, when the grinding-type vertical grain milling machine 50A is in operation, bran is less likely to accumulate on the inner side of the screen structure 1A (the side of the polishing chamber 67), which reduces the frequency of maintenance on the grinding-type vertical grain milling machine 50A and makes it less likely for the grinding-type vertical grain milling machine 50A to malfunction. Therefore, according to the screen structure 1A of Example 1, a high-performance grinding-type vertical grain milling machine 50A can be provided.

[0053] Furthermore, according to the screen structure 1A of Example 1, the operation of attaching the feed plate 3 to the screen 2, or removing the feed plate 3, can be made extremely easy. As a result, the productivity of the screen structure 1A can be improved, and maintenance and repair of the screen structure 1A can also be made easier.

[0054] In addition, according to the screen structure 1A of Example 1, since both the feed plate 3 and the holder 4A are flat metal plates, their manufacture is extremely easy. Therefore, this also contributes to improving the productivity of screen structure 1A.

[0055] Furthermore, if the feed plate 3 is a flat metal plate, when heat treatment is performed to improve its strength, the heat is distributed evenly to the feed plate 3, making it less likely for variations in quality to occur after heat treatment. Therefore, from this point of view as well, we can provide a high-performance screen structure 1A and a grinding-type vertical grain milling machine 50A using it.

[0056] Here, we will describe a modified example and detailed structure of the screen structure 1A according to Example 1. The space between the claw portions 4a of the holder 4A may, if necessary, be extended to a slender, flat connecting portion 4c1 and may also be provided with a flat reinforcing portion 4e that protrudes from the tip side of the claw portions 4a. In this case, the width of the connecting portion 4c1 in the shorter direction can be increased, thereby improving the strength and durability of the holder 4A.

[0057] In this embodiment, the case in which a slit 4d1 is formed in the claw portion 4a of the holder 4A is described as an example, but the slit 4d1 does not necessarily have to be formed. If a slit 4d1 is not formed in the claw portion 4a, after inserting the claw portion 4a of the holder 4A into the slit hole 3d of the feed plate 3 (see Figure 10), the desired claw portion 4a can be bent toward the projection 3c of the feed plate 3 to prevent the claw portion 4a from coming out of the slit hole 3d of the feed plate 3. In this case, removing the holder 4A from the feed plate 3 becomes somewhat more difficult, but it prevents the holder 4A from coming off.

[0058] In this embodiment, the feed plate 3 and holder 4A are described as being flat metal plates, but they do not necessarily have to be flat metal plates and may have a three-dimensional shape other than a flat plate. In this case, while the manufacturing of the feed plate 3 and holder 4A may be costly and time-consuming, the intended function can be performed without any problems.

[0059] In this embodiment, the case in which a holder 4A is used as the retaining structure for the feed plate 3 is described as an example, but a retaining structure other than the holder 4A may be used for the feed plate 3. More specifically, instead of the slit hole 3d formed in the projection 3c of the feed plate 3, an insertion hole is formed for inserting a retaining structure (not shown), and by attaching the retaining structure, such as a fastener consisting of a bolt and nut or a cotter pin, to this insertion hole, the feed plate 3 can be prevented from coming off. Alternatively, a groove for fitting can be formed in the projection 3c of the feed plate 3, and a clamping device or the like having a structure that fits into this groove can be attached to the projection 3c to prevent the feed plate 3 from coming off. In either case, compared to using the combination of feed plate 3 and holder 4A according to Example 1, it may not be possible to simplify the installation and removal of the retaining structure. However, since it is possible to achieve a state in which there are no protrusions other than the guide portion 3a on the inner surface of the screen structure 1A, a screen structure 1A with excellent bran removal performance can be provided. [Examples]

[0060] A screen structure and its assembly method according to Embodiment 2 of the present invention will be described with reference to Figures 12 to 20. The screen structure 1B according to Example 2 is a screen structure used in the bran removal wire mesh cylinder 66B that constitutes the grain polishing section 51B of the grinding type horizontal grain polishing machine 50B as shown in Figure 12. The grinding-type horizontal grain mill 50B is configured such that the axis of the main shaft 53 of the grain milling section 51A in the aforementioned grinding-type vertical grain mill 50A is horizontally positioned, and two grain milling sections 51B are provided in the vertical direction. The grain, which is the raw material, is milled as it moves sequentially from the grain milling section 51B located in the upper section to the grain milling section 51B located in the lower section.

[0061] As shown in Figure 12, the bran removal wire mesh cylinder 66B of the grinding-type horizontal grain milling machine 50B is formed by attaching the screen structure 1B according to this embodiment to the operating frame 10B and stretching it between two horizontally arranged support columns 68 around the milling roll 56, thereby integrating two screen structures 1B into a cylindrical shape via the support columns 68.

[0062] The structure of the screen structure 1B according to Example 2 will be described with reference to Figures 12 to 16. In Example 2, components common to the screen structure 1A in Example 1 described above are denoted by the same reference numerals and their descriptions are omitted, while the different components are described below. As shown in Figures 12 and 13, the screen 2 in the screen structure 1B of Example 2 is a wire mesh tube with many bran removal holes 2b formed therein, which is divided vertically into n sections (for example, 2 sections). As shown in Figure 13, in the screen structure 1B according to Embodiment 2, any one feed plate 3 is fixed to the screen 2 by multiple holders 4B. In the screen structure 1B according to Example 2, the fixing structure of the feed plate 3 is also entirely located on the outer surface of the screen 2. As shown in Figure 14, the only protrusions on the inner surface of the screen structure 1B are the guide portion 3a.

[0063] In the feed plate 3 of the screen structure 1B according to Example 2, as shown in Figure 16A, the length direction of the slit 4d2 coincides with the direction perpendicular to the arc that forms the outer surface of the screen 2. Furthermore, in the feed plate 3 of the screen structure 1B, a notch 3e is formed at the top of the projection 3c (see Figure 16A). This notch 3e is used to align the holder 4B when attaching the holder 4B to the projection 3c of the feed plate 3.

[0064] In the holder 4B of the screen structure 1B, as shown in Figures 15 and 16B, each claw portion 4a is positioned such that the longitudinal direction of the connecting portion 4c2 is parallel to the central direction of the claw portion 4a, from the base 4b to the tip. Therefore, the connection between each claw portion 4a and the connecting portion 4c2 has an L-shaped corner portion 4g in plan view. In other words, the claw portions 4a attached to the long side of the connecting portion 4c2 at desired intervals are hook-shaped. Furthermore, at the mounting position of each claw portion 4a of the holder 4B, a notch 4f is formed on the inside of the corner portion 4g in plan view. This notch 4f engages with a notch 3e formed on the projection 3c when attaching the holder 4B to the projection 3c of the feed plate 3, and is used to position the holder 4B.

[0065] The assembly method of the screen structure 1B according to Embodiment 2 will be described with reference to Figures 17 to 19. When assembling the screen structure 1B according to Example 2, first, as shown in Figure 17, the feed plate 3 is placed on the inner surface (curved concave side) of the screen 2, and then the projection 3c protruding from the feed plate 3 is inserted into the insertion hole 2c formed in the screen 2. Similarly, all the required number of feed plates 3 are inserted into the screen 2. As a result, as shown in Figure 18, the protrusions 3c of the feed plate 3 protrude from all the insertion holes 2c formed in the screen 2 onto the outer surface of the screen 2.

[0066] Subsequently, the claws 4a provided on the holder 4B are inserted into the slit holes 3d of the protrusions 3c (see Figure 18) located at positions P1 to P5, thereby connecting all the protrusions 3c located at the longitudinal ends (upper part of the paper) of the feed plate 3 in Figure 18 to the screen 2 via the holder 4B and fixing them to the screen 2. At this time, by fitting the notch 4f formed in the holder 4B into the notch 3e formed in the top of the projection 3c of the feed plate 3, the holder 4B can be positioned on the top of the projection 3c.

[0067] By following the same procedure as above, the holders 4B can be sequentially attached to the respective protrusions 3c at positions Q1-Q5, R1-R5, S1-S5, and T1-T5, thereby connecting and fixing all the protrusions 3c of the feed plate 3 with the holders 4B (see Figure 13). Thus, in the screen structure 1B according to Example 2, any one feed plate 3 can be fixed to the screen 2 using multiple holders 4B.

[0068] Subsequently, by bending the claw portion 4a on the holder 4B that has the slit 4d2 formed therein, it is possible to prevent the holder 4B from coming off the feed plate 3.

[0069] The bran-removing wire mesh cylinder 66B, which is constructed using the screen structure 1B according to Example 2, has a smaller diameter compared to the bran-removing wire mesh cylinder 66A used in the grinding-type vertical grain mill 50A mentioned earlier. As a result, the curvature of the screen 2 is greater than the curvature of the screen structure 1A. In the screen structure 1B according to Example 2, there is no need to bend the connecting portion 4c2 of the holder 4B during assembly, making it particularly suitable for fixing the feed plate 3 to a screen 2 with a relatively large curvature.

[0070] Furthermore, in the screen structure 1B according to Example 2, if both the feed plate 3 and the holder 4B are flat metal plates, when heat-treating them to improve their strength, the heat is evenly distributed to the feed plate 3 and the holder 4B, making it less likely for variations in quality to occur after heat treatment. In this case, a higher-performance screen structure 1B and a grinding-type horizontal grain milling machine 50B using the same can be provided.

[0071] Here, we will explain some modifications of the screen structure 1B according to Example 2. The direction in which the slit 4d2 is formed in the base 4b of the claw portion 4a of the holder 4B does not necessarily have to be in the width direction of the claw portion 4a. As shown in Figure 20A, the slit 4d2' may be formed in the direction from the base 4b toward the tip of the claw portion 4a. In this case, the planar shape of the bent portion of the claw portion 4a can be made elongated, so the claw portion 4a can be easily bent even if the thickness of the holder 4B is relatively large.

[0072] Furthermore, by aligning the longitudinal direction of the slit hole 3d formed in the projection 3c of the feed plate 3 with the direction perpendicular to the arc forming the outer surface of the screen 2, when the feed plate 3 attached to the screen 2 is fixed using the holder 4B, the plate surface direction of the connecting portion 4c2 of the holder 4B can be arranged radially in a cross section perpendicular to the center line of the rice bran removal wire mesh tube 66B. In this case, when the grinding-type horizontal grain milling machine 50B equipped with a bran-removing wire mesh cylinder 66B using the screen structure 1B according to Example 2 is in operation, and when an external force is applied to the guide portion 3a of the feed plate 3, it is possible to suppress the concentration of stress locally in the insertion holes 2c formed in the screen 2. This makes it possible to suppress damage to the screen structure 1B according to Example 2, thereby improving the durability of the bran removal wire mesh cylinder 66B and the grinding-type horizontal grain milling machine 50B equipped therewith. Therefore, we can provide a high-performance grinding-type horizontal grain milling machine 50B.

[0073] In the screen structure 1B according to Embodiment 2, the example is given of attaching any one holder 4B by hooking it onto the projections 3c of all the feed plates 3 provided on the screen 2. However, the attachment target of any one holder 4B may be two or more desired feed plates 3. If the number of feed plates 3 to which any one holder 4B is attached is small, the total number of holders 4B required to secure all feed plates 3 will increase, but the desired effect can still be achieved without any problems.

[0074] In this embodiment, a screen structure 1A used in a grinding-type vertical grain milling machine 50A and a screen structure 1B used in a grinding-type horizontal grain milling machine 50B are described, but screen structures 1A and 1B can also be used as screen structures for friction-type rice milling machines. [Industrial applicability]

[0075] As described above, the present invention relates to a screen structure and assembly method for a wire mesh tube used in a grain milling machine to remove bran. It can be used in technical fields related to milling rice and wheat, such as grinding type, friction type, dry or wet type rice milling machines that do not require water washing, and rinse-free rice milling machines, as well as in technical fields related to the processing of resin materials, such as paint removal for recycling painted resins, and surface treatment and surface processing of resins used as raw materials. [Explanation of Symbols]

[0076] 1A, 1B…Screen structure 2…Screen 2a…Main body 2b…Brax removal hole 2c…Insertion hole 2d…Mounting plate 2e…Bolt insertion hole 3…Feed plate 3a…Guide part 3b…End face 3c…Protrusion 3d…Slit hole 3e…Notch 4A, 4B…Holder 4a…Claw part 4b…Base part 4c1, 4c2…Connecting part 4d1, 4d2, 4d2'…Slit 4e…Reinforcement part 4f…Notch 4g…Corner part 10A, 10B…Frame 11…Bolt 12…Countersunk bolt 50A…Grinding type vertical grain mill 50B…Grinding type horizontal grain mill 51A, 51B…Grin mill part 52…Main body base 53…Main shaft 54…Upper bearing part 55…Lower bearing part 56...Grinding type polishing roll (polishing roll) 57...Motor base 58...Motor 59...Motor pulley 60...Spindle pulley 61...V-belt 62...Grinding disc 63...Spacer 64...Feed roll 65...Screw blades 66A, 66B...Bran removal wire mesh cylinder 67...Polishing chamber 68...Support column 69...Bran removal chamber cover 70...Bran removal chamber 71...Support column cover 72...Supply cylinder 73...Hopper cylinder 74...Inlet 75...Guide body 76...Adjustment lever 77...Supply amount adjustment device 78...Discharge port 79...Discharge trough 80...Weight lever 81...Lid 82...Polishing chamber resistor 83...Bran collection chamber 84...Scooping blades 85...Bran collection fan

Claims

1. A screen structure that constitutes a wire mesh tube for removing bran in a grain milling machine, A screen having numerous bran removal holes, A feed plate that regulates the movement of grains, A screen structure characterized by comprising a holder disposed on the outer surface of the screen and detachably fixing the feed plate on the inner surface of the screen.

2. The aforementioned screen is provided with a plurality of insertion holes in the thickness direction, The aforementioned feed plate is On the inner surface of the screen, a guide portion extends in a rib-like manner in the circumferential direction of the rice bran removal wire mesh cylinder, Each of the aforementioned insertion holes is provided with a plurality of protrusions that are inserted from the inner surface to the outer surface of the screen, The screen structure according to claim 1, characterized in that the holder is attached to the projection so as to be in a position that prevents it from coming out of the insertion hole of the projection.

3. Each of the aforementioned protrusions has a slit hole that penetrates the portion of the screen that protrudes onto the outer surface of the screen, in a direction substantially parallel to the center line of the rice bran removal wire mesh tube. The screen structure according to claim 2, characterized in that the holder has a flat claw portion inserted into each of the slit holes and a connecting portion that integrally connects the base side of the claw portion.

4. The screen structure according to claim 3, characterized in that at least one of the plurality of claw portions connected by the connecting portion has a slit formed therein that penetrates the thickness direction of the claw portion and allows a part of the planar area of ​​the claw portion to be bent.

5. The screen structure according to claim 3 or 4, characterized in that all of the multiple claw portions connected by the connecting portion are inserted into the slit holes in any one of the feed plates.

6. The screen structure comprises a plurality of feed plates, The screen structure according to claim 3 or 4, characterized in that the plurality of claw portions connected by the connecting portion are each inserted into the slit holes in different feed plates.

7. The screen structure according to claim 3 or 4, characterized in that both the feed plate and the holder are flat metal plates.

8. A method for assembling a screen structure that constitutes a bran removal wire mesh cylinder in a grain milling machine, The projection of the feed plate is inserted through the insertion hole provided in the screen from the inner surface to the outer surface of the screen, and the feed plate is positioned on the inner surface of the screen. Next, a method for assembling a screen structure, characterized by fixing the feed plate to the screen by attaching a holder from the outer surface side of the screen to the projection that protrudes from the outer surface of the screen, such that the holder is positioned to prevent the projection from coming out of the insertion hole.

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