Horizontal shaft rice polisher

Abstract

The technical objective is to shorten the time required for initial circulation milling by eliminating the retention of grain in the milling chamber during initial circulation milling. [Solution] The horizontal-axis rice polisher comprises a rotatable polishing roll 35, a polishing cylinder 40 arranged to surround the polishing roll 35 and forming a polishing chamber 210 between the polishing roll 35 and the polishing cylinder 40, a supply port 55 for supplying grain to the polishing chamber 210, a discharge port 60 for discharging the grain from the polishing chamber 210, a resistance lid 70 arranged to cover the discharge surface 65 of the discharge port 60, and a polishing pressure adjustment means 80 that biases the resistance lid 70 so that the pressure inside the polishing chamber 210 is sufficient to polish the grain, and the resistance lid 70 covers the discharge surface 65 while forming at least one open area at a lateral end of the discharge surface 65.

Description

[Technical Field]

[0001] The present invention relates to the field of grain polishers, and more particularly to a mechanism that can shorten the time required for initial circulation polishing in a OnePass (registered trademark) horizontal shaft friction type rice polisher. [Background technology]

[0002] In conventional grain polishers, particularly single-pass rice polishers, the entire discharge port is covered with a resistance lid (resistance plate) that is biased by a weight or air cylinder, etc., a predetermined pressure is set inside the polishing chamber, and the polished rice is discharged against the pressure of the resistance lid to polish the rice.

[0003] In such rice polishers, the pressure inside the polishing chamber is low immediately after polishing begins until the rice is filled, and the polishing effect is not fully exerted. As a result, the rice discharged from the discharge outlet is a mixture of sufficiently polished rice and insufficiently polished rice, resulting in what is known as uneven polishing.

[0004] For this reason, for a certain period of time from the start of rice milling (until all of the rice discharged from the discharge port has been sufficiently milled), it is necessary to repeatedly mill the rice by returning the rice discharged from the discharge port to the supply port and circulating it. This repeated milling of rice in the early stages of rice milling is referred to in this specification as "initial circulation rice milling." However, during the initial circulation rice milling, the rice is filled into the milling chamber and the resistance lid is not opened until a certain pressure is reached, making it difficult to discharge the rice. As a result, insufficiently milled rice remains in the milling chamber for a long time, which increases the time required for the initial circulation rice milling.

[0005] In response to this, Patent Document 1 (Patent Publication No. 3356848) discloses a rice polishing machine that can discharge all of the polished rice in the polishing chamber by stopping the bran removal fan and opening the resistance plate after waiting a set time to allow the unpolished rice in the polishing chamber to be sufficiently polished after the rice supply from the supply hopper has finished (see paragraph 0006).

[0006] Furthermore, Patent Document 2 (Patent Publication No. 3708417) discloses a rice polishing machine in which the resistance plate moves parallel to the discharge outlet in the forward and backward directions, thereby applying uniform resistance to the rice to be polished inside the rice polishing screen, resulting in an even degree of polishing (see paragraph 0009). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3356848 [Patent Document 2] Patent No. 3708417 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the rice polishing machine described in Patent Document 1 is designed to prevent rice from remaining in the polishing chamber after polishing is complete, and does not address the aforementioned problem of initial circulation rice polishing. Furthermore, the rice polishing machine described in Patent Document 2 is designed to equalize the degree of rice polishing by having the resistance plate apply uniform resistance to the entire discharge outlet, and does not solve the aforementioned problem of initial circulation rice polishing.

[0009] In view of the above problems, the present invention aims to shorten the time required for initial circulation grain milling (rice milling) by eliminating the retention of grain (rice) in the milling chamber. [Means for solving the problem]

[0010] The present invention has been made to solve at least part of the above-mentioned problems, and can be realized, for example, in the following forms.

[0011] According to a first aspect of the present invention, Horizontal shaft rice polisher is provided. Horizontal shaft rice polisherThe milling machine comprises a rotatable polishing roll, a polishing cylinder arranged to surround the polishing roll and forming a polishing chamber between the polishing roll and the polishing cylinder, a supply port for supplying grain to the polishing chamber, a discharge port for discharging the grain from the polishing chamber, a resistance lid arranged to cover the discharge surface of the discharge port, and polishing pressure adjusting means for biasing the resistance lid so that the pressure in the polishing chamber is sufficient to polish the grain. The resistance lid covers the discharge surface while forming at least one open area on the discharge surface. In the first embodiment, the resistance cover may be configured to cover the ejection surface while forming at least one open area at a lateral end of the ejection surface. Furthermore, the above Horizontal shaft rice polisher The resistance cover can also be realized in a form in which the resistance cover covers the discharge surface while forming at least one open area at the side end of the discharge surface, and the ratio of the total area of ​​the open areas to the area of ​​the area surrounded by the discharge outlet edge of the discharge outlet is 2% or more and 15% or less.

[0012] This first form Horizontal shaft rice polisher In the milling machine, the resistance cover does not cover the entire discharge surface, but rather covers the discharge surface while forming an open area on part of the discharge surface. This has the effect of allowing grain to be efficiently discharged from the open area formed on part of the discharge surface until a predetermined pressure is reached inside the milling chamber during initial circulation milling. This prevents insufficiently polished grain from remaining in the milling chamber for a long period of time, and as a result, it is possible to shorten the time required for initial circulation milling.

[0013] According to a second aspect of the present invention, more than 50% of the area of ​​the open region in the first aspect is present within the lower 50% of the discharge surface of the discharge outlet. With this aspect, the majority of the open region is concentrated on the side to which the grain tends to be biased due to gravity, making it easier for the grain to be discharged.

[0014] According to the third aspect of the present invention, in the first aspect, more than 50% of the area of ​​the open region is present within one 50% area of ​​the left and right direction of the discharge surface of the discharge outlet. Grain discharged from the discharge outlet tends to be biased to either the left or right direction (horizontal direction) due to the rotation of the milling rolls. Therefore, according to this aspect, the majority of the open region is concentrated on the side to which the grain is biased due to the rotation of the milling rolls, making it easier for the grain to be discharged.

[0015] According to a fourth aspect of the present invention, in any one of the first to third aspects, an open area adjustment mechanism is provided for changing the area of ​​the open area steplessly or stepwise. This aspect allows the size of the open area to be changed as desired. Therefore, the optimal area of ​​the open area can be set depending on the milling conditions (grain variety and grain size). [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a cross-sectional view of the main parts of the rice polisher according to the first embodiment. [Figure 2] FIG. 2 is a longitudinal cross-sectional view taken in a direction perpendicular to the axial direction to show the milling chamber of the rice milling machine according to the first embodiment. [Figure 3] FIG. 10 is an explanatory diagram showing how a discharge port is covered with a resistance cover in a conventional rice polishing machine. [Figure 4] FIG. 3 is an explanatory diagram showing how the discharge port is covered with the resistance cover in the rice polishing machine according to the first embodiment. [Figure 5] FIG. 10 is an explanatory diagram showing how the discharge port is covered with the resistance cover in the rice polishing machine according to the second embodiment. [Figure 6] FIG. 10 is an explanatory diagram showing the configuration of an open area adjustment mechanism in a rice polishing machine according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] The configuration of a rice polishing machine 1 according to the first embodiment will be described with reference to Figures 1 and 2. Figure 1 is a cross-sectional view of a main part of the rice polishing machine 1 according to the first embodiment. The rice polisher 1 is a one-pass horizontal-axis friction rice polisher, and comprises a rice polisher main body 10, a polishing shaft 20 that is rotatably arranged on the rice polisher main body 10 and is hollow with one end open, a screw conveyor 30 that is fixed to the upstream side of the polishing shaft 20 and forms a grain transfer chamber 200 between it and the rice polisher main body 10, a polishing roll 35 that is fixed to the downstream side of the polishing shaft 20, and a polishing tube 40 that is arranged to surround the polishing roll 35 and forms a polishing chamber 210 between it and the polishing roll 35 and a dust collection chamber 220 between it and the rice polisher main body 10. a supply hopper 50 for storing rice to be supplied to the inside of the rice polishing machine 1; a supply port 55 for supplying rice from the supply hopper 50 to the inside of the rice polishing machine 1; a discharge port 60 for discharging the polished rice; a resistance lid 70 arranged to cover the discharge surface 65 of the discharge port 60; polishing pressure adjustment means 80 for setting the pressure inside the polishing chamber 210 to the pressure required for polishing the rice by urging the resistance lid 70; and a downflow trough 90 for receiving the rice discharged from the discharge port 60 and discharging it outside the rice polishing machine 1. The one-pass system refers to a system in which brown rice is milled to white rice by passing it through only one rice mill. In contrast, when brown rice is milled to white rice in stages by passing it through multiple rice mills, it is called a multi-stage rice milling or multiple-pass system. For example, when rice is milled using two rice mills, one for preliminary milling and one for final milling, it is called a two-pass system.

[0018] The screw conveyor 30 is a cylindrical member having a spiral protrusion 30a on its outer periphery. The screw conveyor 30 transfers rice supplied from the supply port 55 from the grain sending chamber 200 to the polishing chamber 210 by its rotation.

[0019] The pounding tube 40 is a cylindrical member made of a wire mesh or the like having a plurality of ventilation holes 40a and a circular or polygonal, for example, hexagonal, cross section. The bran scraped off from the surface of the brown rice in the pounding chamber 210 passes through the ventilation holes 40a and moves to the dust collection chamber 220.

[0020] The resistance cover 70 (see FIG. 1) is composed of a plate-like member 71 which is a steel plate with one end (upper end 71a) slightly bent, a support part 72 fixed to the plate-like member 71, a shaft 73 which positions and fixes the plate-like member 71 and the support part 72 to the rice milling machine main body 10 so that they can rotate like a hinge, and a link part 74 which is axially attached to and fixed to the shaft 73. With this configuration, the resistance cover 70 is positioned so as to be rotatable around the shaft 73 so as to cover the discharge surface 65 of the discharge port 60.

[0021] The polishing pressure adjusting means 80 has one end 80a rotatably connected to the rice milling machine main body 10 and the other end 80b rotatably connected to the link portion 74 of the resistor cover 70 so as to rotate the resistor cover 70 around the axis 73 with a predetermined force. For example, an air cylinder can be used as the polishing pressure adjusting means 80. When an air cylinder is used as the polishing pressure adjusting means 80, it is preferable to connect it to a compressed air supply source (not shown) via a solenoid valve (not shown). By operating the solenoid valve with a control unit (not shown) to control the air supplied to the air cylinder, the force with which the resistor cover 70 presses against the discharge surface 65 of the discharge port 60 can be adjusted as desired. While FIG. 1 shows the resistor cover 70 being biased by supplying air in the direction in which the air cylinder extends, it may also be configured to bias the resistor cover 70 by supplying air in the direction in which the air cylinder retracts.

[0022] Fig. 2 is a vertical cross-sectional view (VV cross-sectional view of Fig. 1) showing the inside of the polishing chamber 210. A plurality of ventilation holes 20a are provided on the outer periphery of the polishing shaft 20, connecting the inside and outside of the polishing shaft 20. The polishing roll 35 has two protrusions 35a extending in the axial direction on its outer periphery, and ventilation grooves 35b are provided along the protrusions 35a, connecting the inside and outside of the polishing roll 35.

[0023] Next, the principle of rice milling by the rice milling machine 1 will be explained with reference to Figures 1 and 2. During rice milling, the rice milling machine 1 rotates the screw conveyor 30 and milling rolls 35 fixed to the milling shaft 20 via a belt 100 and pulleys 110 driven by a prime mover (not shown). In this state, when rice (brown rice) in the supply hopper 50 is fed into the grain transfer chamber 200 through the supply port 55, the rice is transported downstream by the rotation of the screw conveyor 30. After that, the rice reaches the milling chamber 210 and is transported further downstream while the rotation of the milling rolls 35 causes multiple rice grains to rub against each other (grain-to-grain friction). This frictional force scrapes off the bran layer on the surface of the brown rice, thereby milling the rice. At this time, the resistance lid 70 is biased by the milling pressure adjusting means 80, so that the pressure inside the milling chamber 210 is maintained at the pressure necessary to mill the rice. After that, the milled rice (white rice) is discharged from the discharge port 60 through the downflow conduit 90 to the outside of the rice milling machine 1 while resisting the pressing force of the resistance lid 70. In addition, the bran scraped off in the polishing chamber 210 moves through the multiple ventilation holes 40a of the polishing tube 40 to the dust collection chamber 220 due to the air flow (suction force) caused by a dust collection fan (not shown) installed downstream of the dust collection chamber 220, and is then discharged outside the rice polishing machine 1.

[0024] Here, the configuration of a conventional rice polishing machine 1' will be described with reference to Figure 3. Figure 3 is an explanatory diagram showing how the discharge port 60 in the conventional rice polishing machine 1' is covered with a resistance cover 70', and corresponds to a view seen in the direction of arrow W in Figure 1. The rectangle indicated by the dotted line in Figure 3 is the discharge port 60 that is hidden (ordinarily invisible) by the resistance cover 70', and a discharge surface 65 is formed inside the discharge port edge 60a. As shown in Figure 3, the resistance cover 70' of the conventional rice polishing machine 1' is composed of a plate-shaped member 71', a support part 72' fixed to the plate-shaped member 71', a shaft 73' that arranges and fixes the plate-shaped member 71' and the support part 72' to the rice polishing machine main body 10 so that they can rotate like a hinge, and a link part 74' that is axially attached to and fixed to the shaft 73'. Note that the configuration of the resistance cover 70' of the conventional rice polishing machine 1' other than the plate-shaped member 71' is the same as that of the resistance cover 70 of the first embodiment. In the conventional rice polishing machine 1', the entire discharge surface 65 of the discharge port 60 is covered by the resistance cover 70'. Hereinafter, the area of ​​the region surrounded by the discharge port edge 60a is defined as A. Note that other configurations of the conventional rice polisher 1′ are similar to those of the rice polisher 1 according to the first embodiment described above, and therefore description thereof will be omitted.

[0025] Next, problems with the conventional rice polishing machine 1' will be described with reference to FIGS. In the conventional rice polishing machine 1', for a certain period of time in the early stages of rice polishing, the polishing chamber 210 is not filled with rice, and the pressure inside the polishing chamber 210 does not reach the pressure required for polishing. Therefore, for a certain period of time in the early stages of rice polishing, the rice discharged from the discharge outlet 60 is insufficiently polished. If polishing is continued in this state, insufficiently polished rice will be mixed into the finished product (white rice), leading to a deterioration in the quality of the rice product.

[0026] To prevent this deterioration in quality, in the conventional rice polishing machine 1', for a certain period of time in the early stages of rice polishing, all of the rice discharged from the discharge outlet 60 through the downflow conduit 90 is returned to the supply hopper 50 using a return mechanism (not shown) consisting of a switching valve, an elevator, etc., thereby repeatedly polishing the rice. In other words, it was necessary to perform the initial circulation rice polishing for a certain period of time.

[0027] However, as mentioned above, during the initial circulation rice milling, the pressure inside the polishing chamber 210 is low, making it difficult to open the resistance lid 70' biased by the polishing pressure adjustment means 80. Therefore, if the resistance lid 70' covers the entire discharge surface 65 of the discharge port 60, as in the conventional rice milling machine 1' shown in Figure 3, insufficiently polished rice will not be discharged and will remain in the polishing chamber 210 for a long time. As a result, it was necessary to set a long time for the initial circulation rice milling, that is, the time required for repeated polishing from the start of polishing until all the rice discharged from the discharge port 60 becomes sufficiently polished white rice. Conversely, there was also the problem of rice cracking and reduced product yield if the rice remaining in the polishing chamber 210 was over-polished.

[0028] The rice polishing machine 1 according to the first embodiment solves the above problem by using a resistance cover 70 shown in Fig. 4. Fig. 4 is an explanatory diagram showing how the discharge port 60 is covered with the resistance cover 70 in the rice polishing machine 1 according to the first embodiment, and is a view seen in the direction of arrow W in Fig. 1. As shown in FIG. 4, the resistance cover 70 does not cover the entire discharge surface 65 of the discharge port 60, but is arranged to form an open area D1 consisting of two rectangles on part of the discharge surface 65. In this case, the area of ​​the open area D1 (the total area of ​​the two rectangles) is represented by A1. This allows rice to be efficiently discharged from the open area D1 during initial circulation rice milling, even before the pressure inside the milling chamber 210 becomes sufficient to open the resistance cover 70. Therefore, insufficiently milled rice does not remain in the milling chamber 210 for a long period of time, and as a result, the time required for initial circulation rice milling can be shortened. This also solves the problems of rice cracking and reduced product yield.

[0029] Furthermore, during the initial circulation rice milling, the rice on the discharge surface 65 of the discharge outlet 60 is not discharged uniformly across the entire discharge surface 65, but is discharged unevenly. For example, the rice near the discharge surface 65 of the discharge outlet 60 is biased downward due to gravity, and is also biased to either the left or right due to the rotation of the polishing rolls 35. For this reason, it is more desirable that the aforementioned open area D1 be concentrated on the side of the discharge surface 65 of the discharge outlet 60 where the rice is biased.

[0030] A rice polishing machine 2 according to a second embodiment, which is a more preferred embodiment of the present invention, will be described with reference to Fig. 5. Fig. 5 is an explanatory diagram showing how the discharge port 60 is covered with a resistance cover 75 in the rice polishing machine 2 according to the second embodiment. 5, the rice that reaches the discharge surface 65 of the discharge outlet 60 is discharged with a bias towards the bottom due to gravity. In addition, the polishing roll 35 rotates in the direction of arrow X, and due to this rotation, the rice that reaches the discharge surface 65 of the discharge outlet 60 is discharged with a bias towards the right. The resistance cover 75 of the rice polishing machine 2 according to the second embodiment is composed of a plate-shaped member 76, a support part 77 fixed to the plate-shaped member 76, a shaft 78 that arranges and fixes the plate-shaped member 76 and the support part 77 to the rice polishing machine main body 10 so that they can rotate like a hinge, and a link part 79 that is axially attached to and fixed to the shaft 78. The configuration of the resistance cover 75, other than the plate-shaped member 76, is the same as that of the resistance cover 70 of the first embodiment. The plate-like member 76 of the resistance cover 75 has a plurality of (three) holes 76a, and these holes 76a form an open area D2 consisting of three circles on the discharge surface 65 of the discharge outlet 60. The majority of the area A2 of this open area D2 (the total area of ​​the three circles) is located on the lower side of the discharge surface 65 of the discharge outlet 60, where rice tends to be biased due to gravity, and the majority of the area (two-thirds of the area in the second embodiment) is concentrated on the right side, where rice tends to be biased due to the rotation of the polishing rolls 35. Note that the other configuration of the rice polisher 2 according to the second embodiment is the same as that of the rice polisher 1 according to the first embodiment, and therefore a description thereof will be omitted. With this configuration, the rice polishing machine 2 according to the second embodiment has the effect of efficiently discharging rice from the open area D2 formed on the discharge surface 65 of the discharge outlet 60, even if there is a bias in the rice due to the influence of gravity and the rotation of the polishing roll 35 during the initial circulation rice polishing.

[0031] Furthermore, depending on how the rice mill is used, the condition of the rice (rice variety and grain size) can vary. For example, coin-operated rice mills often use different varieties of rice depending on the user. Also, even with large rice mills installed in rice milling factories, even if the rice is the same variety, differences in the growing conditions of the rice occur depending on the producer, and as a result, the size of the rice grains varies from lot to lot. For this reason, it is desirable for rice mills to provide consistent milled quality even when the condition of the rice being milled changes.

[0032] A rice polishing machine 3 according to a third embodiment, which is a more preferred form of the present invention, will be described with reference to Figure 6. The rice polishing machine 3 according to the third embodiment is equipped with an open area adjustment mechanism 300 that can adjust the area A3 of the open area D3 formed on the discharge surface 65 of the discharge outlet 60 by the resistance cover 150. Figure 6 is an explanatory diagram showing the configuration of the open area adjustment mechanism 300 in the rice polishing machine 3 according to the third embodiment. The open area adjustment mechanism 300 is composed of a resistance cover 150 and a fixing means 160. The resistance cover 150 is composed of a plate-shaped member 151, a support part 152 fixed to the plate-shaped member 151, a shaft 153 fixed to the support part 152, and a link part 154 pivotally attached to and fixed to the shaft 153. The plate-shaped member 151 and the support part 152 are arranged by the shaft 153 so as to be rotatable like a hinge with respect to the rice polishing machine main body 10 and so as to be movable relatively in the left-right direction. The fixing means 160 are detachable fixing members for fixing the left-right position of the shaft 153, and are arranged on the left and right sides of the rice polishing machine main body 10, with one fixing means 160 between them. As the fixing means 160, for example, a set collar can be used. Moreover, one end 80a of the milling pressure adjusting means 80 is rotatably arranged on the rice milling machine main body 10 (similar to FIG. 1), and the other end 80b is rotatably arranged on the link part 154 of the resistance cover 150 and is also arranged so as to be movable in the left-right direction relative to the link part 154. The other configurations are the same as those of the rice milling machine 1 of the first embodiment, so a description thereof will be omitted. At this time, the resistance cover 150 forms an open area D3 consisting of a rectangle at the side end of the discharge surface 65 of the discharge port 60. The length of the short side of this rectangle is d3, The area of ​​the open region D3 is A3.

[0033] With this configuration, in the rice polishing machine 3 of the third embodiment, the user can continuously change the left-right position of the resistance cover 150 by operating the open area adjustment mechanism 300. Specifically, when the fixing means 160 is released, the position of the resistance cover 150 can be changed in the left-right direction (the direction of arrow Y in FIG. 6 ). After that, the resistance cover 150 is moved to a position where the area A3 of the open area D3 is the desired size, and then the left-right position of the resistance cover 150 is fixed again by the fixing means 160. By performing the above operations, it is possible to freely adjust the size of the open area D3. In other words, it is possible to set the optimal area A3 of the open area D3 according to the variety of rice being milled and the size of the rice grains.

[0034] The area A3 of the open area D3 in this embodiment 3 should be set according to the size of the rice grains to be polished. Specifically, the ratio A3 / A of the area A3 of the open area D3 to the area A (see FIG. 3) of the area surrounded by the discharge opening edge 60a should be set in the range of 2%≦A3 / A≦15%. More preferably, it should be set in the range of 3%≦A3 / A≦10%. 6, the width d3 of the short side of the open area D3 is preferably set in the range of 2 mm≦d3≦15 mm, and more preferably in the range of 3 mm≦d3≦10 mm. If the size of the open area D3 (area A3 or width d3) is too small, rice will not be discharged properly during the initial circulation rice milling, and the effect of shortening the time required for the initial circulation rice milling will not be obtained. Also, if it is too large, too much rice will be discharged from the open area D3, and the rice will not be filled into the milling chamber 210, making it impossible to mill the rice.

[0035] Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents having substantially the same configuration, operation, and effect as those claimed in the claims. Furthermore, within the scope of being able to solve at least some of the above-mentioned problems and / or achieve at least some of the effects, it is possible to arbitrarily combine the components described in the claims and specification, or to omit some of them.

[0036] For example, the rice polishers 1 to 3 in the embodiment of the present invention are representative examples of one-pass horizontal-axis friction rice polishers, but are not limited to this. The above-mentioned effects can be similarly obtained when the present invention is applied to a two-pass rice mill or a grinding rice mill that uses rotating grinding rolls to polish rice. Furthermore, the plate-like member 71 that constitutes the resistance lid 70 has a bent upper end 71a to maintain rigidity, but a simple flat plate may also be used. In this case, when the resistance lid 70 is opened during normal rice milling after the initial circulation rice milling is completed, the upper end 71a of the resistance lid 70 acts as a resistance to the rice being discharged from the top of the discharge port 60, preventing it from interfering with discharge. Furthermore, the open areas D1, D2, and D3 formed by the resistor covers 70, 75, and 150 are merely examples, and their positions, shapes, sizes, numbers, etc. may be freely set. In addition, the open area adjustment mechanism 300 may be automatically operable rather than being manually operated as in the third embodiment. Specifically, an actuator such as an electric cylinder for moving the resistance cover 150 left and right, an input unit for inputting information about the rice to be polished, and a control unit connected to these actuators and the input unit are separately provided, and the control unit is configured to pre-store settings for setting the size of the open area D3 according to the variety and size of the rice. With this configuration, it is possible to control the actuator according to information such as the variety and size of the rice input by the user to the input unit, and automatically adjust the size of the open area D3 in a stepped or continuous manner. [Industrial Applicability]

[0037] The present invention contributes to improving the operating efficiency of rice milling machines by shortening the initial circulation rice milling time in grain milling machines, particularly in one-pass horizontal-axis friction rice milling machines. [Explanation of symbols]

[0038] 1~3 Rice polishing machine 1' Rice milling machine (conventional rice milling machine) 10 Rice mill body 20 Seishinshaku 30 Screw conveyor 35 Milled Roll 40 Pound Seizu 50 Supply hopper 55 Supply port 60 Outlet 65 Ejection surface 70, 75, 150 resistance lid 70' Resistance Cover (Conventional Resistance Cover for Rice Mills) 80 Milling pressure adjusting means 90 Downflow Canal 100 Belt 110 Pulley 160 Fixing means 200 Grain sending room 210 Semen chamber 220 Dust Collection Chamber 300 Open area adjustment mechanism A, A1~A3 area D1~D3 Open area d3 width

Claims

1. a rotatable milling roll; a polishing cylinder disposed so as to surround the polishing roll and forming a polishing chamber between the polishing cylinder and the polishing roll; a supply port for supplying grain to the milling chamber; a discharge port for discharging the grain from the milling chamber; a resistance cover disposed to cover the discharge surface of the discharge port; a milling pressure adjusting means for biasing the resistance cover so that the pressure in the milling chamber is the pressure required for milling the grain; Equipped with The resistance cover covers the discharge surface while forming at least one open area at a lateral end of the discharge surface. A horizontal shaft rice polisher characterized by:

2. a rotatable milling roll; a polishing cylinder disposed so as to surround the polishing roll and forming a polishing chamber between the polishing cylinder and the polishing roll; a supply port for supplying grain to the milling chamber; a discharge port for discharging the grain from the milling chamber; a resistance cover disposed to cover the discharge surface of the discharge port; a milling pressure adjusting means for biasing the resistance cover so that the pressure in the milling chamber is the pressure required for milling the grain; Equipped with the resistance cover covers the discharge surface while forming at least one open area at a lateral end of the discharge surface; The ratio of the total area of ​​the open area to the area of ​​the area surrounded by the edge of the outlet is 2% or more and 15% or less. A horizontal shaft rice polisher characterized by:

3. The horizontal shaft type rice polisher according to claim 1 or 2, An open area adjustment mechanism is provided for changing the area of ​​the open area steplessly or stepwise. A horizontal shaft rice polisher characterized by:

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