Rice milling machine

Abstract

To provide a rice milling machine that is able to perform high-accuracy yield control in real time.SOLUTION: A rice milling machine including polishing degree adjustment means that adjusts a polishing degree of rice grains and a control unit that controls the polishing degree adjustment means, comprises: a raw material whiteness sensor that detects whiteness of raw material rice grains before polishing the raw material rice grains; and a product whiteness sensor that detects whiteness of product rice grains after polishing the raw material rice grains; wherein the control unit controls the polishing degree adjustment means so that a whiteness increase value of the product rice grain obtained from the whiteness of the raw material rice grain detected by the raw material whiteness sensor and the whiteness of the product rice grain detected by the product whiteness sensor coincides with a target value of the whiteness increase of the product rice grain set in correspondence with a target value of a yield.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rice milling machine capable of performing high-precision yield control in real time. [Background technology]

[0002] BACKGROUND ART Conventionally, when polishing brown rice using a rice polisher, it is known to control yield based on the change in weight of rice grains before and after polishing (see, for example, Patent Document 1).

[0003] The invention described in Patent Document 1 involves installing weighing devices before and after a rice polishing machine, calculating a yield value based on changes in the weight of rice grains weighed by each weighing device, comparing the yield value with a reference value, and adjusting the resistance force of the resistance cover of the rice polishing machine, allowing for real-time yield control of the rice polishing machine.

[0004] Incidentally, in the invention described in Patent Document 1, the weight of rice grains must be measured instantly using weighing devices installed before and after the rice polishing machine. However, measuring rice grains in a short time is easily affected by vibrations and other factors, resulting in large errors, making it difficult to measure the weight accurately. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-34425 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, an object of the present invention is to provide a rice polishing machine that can perform high-precision yield control in real time. [Means for solving the problem]

[0007] As a result of extensive research, the inventors of the present invention have come up with the present invention by noting that the whiteness of rice grains increases as the rice is polished.

[0008] That is, in order to achieve the above object, the present invention provides: a pounding accuracy adjusting means for adjusting the pounding accuracy of rice grains; A control unit that controls the milling accuracy adjustment means, The rice polishing machine includes at least one polishing unit having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, with a polishing chamber formed between the perforated cylinder and the polishing roll, and a rice grain supply unit provided at one end of the polishing chamber and a rice grain discharge unit provided at the other end thereof, and polishes the rice grains in the polishing chamber; The system is equipped with a raw material whiteness sensor that detects the whiteness of raw material rice grains before polishing, and a product whiteness sensor that detects the whiteness of product rice grains after polishing, the rice grain supply unit in which the raw material whiteness sensor is provided has a rotary valve, a supply-side transparent window is formed on a flow path wall surface of the rotary valve, and the raw material whiteness sensor detects the whiteness of the raw material rice grains through the supply-side transparent window; The control unit controls the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, coincides with the target value for the increase in whiteness of the product rice grains, which is set in accordance with the target value for yield. In order to achieve the above object, the present invention provides: a pounding accuracy adjusting means for adjusting the pounding accuracy of rice grains; A control unit that controls the milling accuracy adjustment means, The rice polishing machine includes at least one polishing unit having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, with a polishing chamber formed between the perforated cylinder and the polishing roll, and a rice grain supply unit provided at one end of the polishing chamber and a rice grain discharge unit provided at the other end thereof, and polishes the rice grains in the polishing chamber; The system is equipped with a raw material whiteness sensor that detects the whiteness of raw material rice grains before polishing, and a product whiteness sensor that detects the whiteness of product rice grains after polishing, The rice grain discharge section in which the product whiteness sensor is provided has a rice grain discharge tube, and a discharge-side transparent window is formed on the peripheral wall surface of the rice grain discharge tube, and the product whiteness sensor detects the whiteness of the product rice grains through the discharge-side transparent window, The control unit controls the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, coincides with the target value for the increase in whiteness of the product rice grains, which is set in accordance with the target value for yield.

[0009] In the present invention, "rice grain whiteness" is defined as a general index that indicates the degree of whiteness of rice grain color, such as the whiteness of rice grain measured using a polishing degree meter "MM1D" manufactured by Satake Corporation or the whiteness of rice grain measured using a whiteness meter "C-600" manufactured by Kett Electric Laboratory Co., Ltd.

[0010] In addition, in the present invention, the term "whiteness sensor" is defined to mean a general sensor that measures the "whiteness of rice grains" by, for example, shining light onto rice grains and receiving the reflected light.

[0011] In the present invention, "whiteness increase value (whiteness increase)" refers to the difference in whiteness between rice grains before polishing (raw material rice grains) and rice grains after polishing has begun (finished rice grains after polishing, and intermediate-product rice grains during polishing), and is an index that represents the change in the whiteness of the color of rice grains before polishing and rice grains after polishing has begun. The difference in whiteness between raw material rice grains (brown rice) and finished rice grains (polished rice including white rice and partially polished rice) is called the "whiteness increase value of finished rice grains," and the difference in whiteness between raw material rice grains and intermediate-product rice grains is called the "whiteness increase value of intermediate-product rice grains," and the numerical value increases as polishing progresses.

[0012] The present invention provides A stand-alone rice milling machine includes a polishing section having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, with a polishing chamber formed between the perforated cylinder and the polishing roll, and a rice grain supply section provided at one end of the polishing chamber and a rice grain discharge section provided at the other end, in which rice grains are polished in the polishing chamber. The rice grain supply section is provided with the raw material whiteness sensor, and the rice grain discharge section is provided with the product whiteness sensor, It is preferable that the control unit controls the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value for the increase in whiteness of the product rice grains, which is set in accordance with the target value of yield.

[0013] The present invention provides A multi-stage rice milling machine has a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and is provided with a plurality of polishing sections in which polishing chambers are formed between the perforated cylinder and the polishing roll, and each polishing chamber has a rice grain supply section at one end and a rice grain discharge section at the other end, in which rice grains are moved from a first-stage polishing section to a final-stage polishing section and polished sequentially in each polishing chamber, The raw material whiteness sensor is provided in the rice grain supply section provided at one end of the polishing chamber in the first-stage polishing section, and the product whiteness sensor is provided in the rice grain discharge section provided at the other end of the polishing chamber in the final-stage polishing section, It is preferable that the control unit controls each pounding accuracy adjustment means at each stage so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value for the increase in whiteness of the product rice grains, which is set in accordance with the target value of yield.

[0014] The present invention provides A multi-stage rice milling machine has a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and is provided with a plurality of polishing sections in which polishing chambers are formed between the perforated cylinder and the polishing roll, and each polishing chamber has a rice grain supply section at one end and a rice grain discharge section at the other end, in which rice grains are moved from a first-stage polishing section to a final-stage polishing section and polished sequentially in each polishing chamber, The raw material whiteness sensor is provided in the rice grain supply section provided at one end of the polishing chamber in the first-stage polishing section, the product whiteness sensor is provided in the rice grain discharge section provided at the other end of the polishing chamber in the final-stage polishing section, and an intermediate product whiteness sensor for detecting the whiteness of intermediate product rice grains during polishing is provided in the rice grain discharge section provided at the other end of each polishing chamber in each polishing section other than the final stage, It is preferable that the control unit controls each pounding accuracy adjustment means at each stage so that the whiteness increase value of the intermediate-product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the intermediate-product rice grains detected by the intermediate-product whiteness sensor, matches the target value for the whiteness increase of the intermediate-product rice grains, which is set within the range of the target value for the whiteness increase of the product rice grains, and so that the whiteness increase value of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value for the whiteness increase of the product rice grains, which is set corresponding to the target value for the yield.

[0015] In the present invention, the target value for the increase in whiteness of the intermediate rice grains is preferably set within the range of the target values ​​for the increase in whiteness of the product rice grains depending on the polishing method of each polishing unit, the number of polishing units, etc.

[0016] The present invention provides a setting unit that allows the target value of the yield to be input and set; a registration unit that can store and register in advance in a table a correspondence relationship between the yield value and the whiteness increase value; It is preferable that the control unit refers to the table in the registration unit based on the target value of yield input and set by the setting unit, reads out the corresponding whiteness increase value from the table, sets the target value of the increase in whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness increase value of the product rice grains calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor matches the target value of the increase in whiteness of the product rice grains.

[0017] The present invention provides a setting unit that allows the user to select the type of raw rice grain and input the target value of the yield; a registration unit that can store and register in advance in a table the correspondence between the yield value and the whiteness increase value for each type of raw material rice grain, It is preferable that the control unit refers to the table in the registration unit based on the target value of yield that is input and set by selecting the type of raw material rice grains in the setting unit, reads out the corresponding whiteness increase value from the table, sets the target value of the increase in whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness increase value of the product rice grains, which is determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value of the increase in whiteness of the product rice grains.

[0018] The present invention provides It is preferable that the control unit compares the increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, with a target value for the increase in whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains coincides with the target value for the increase in whiteness of the product rice grains.

[0019] The present invention provides It is preferable that the control unit sets a target value for the whiteness of the product rice grains based on the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the target value for the increase in whiteness of the product rice grains, compares the whiteness of the product rice grains detected by the product whiteness sensor with the target value for the whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness of the product rice grains matches the target value for the whiteness of the product rice grains. As a result, the present invention can control the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value for the increase in whiteness of the product rice grains, which is set in accordance with the target yield value.

[0022] The present invention provides It is preferable that the rice grain discharge section in which the intermediate product whiteness sensor is provided has a rice grain discharge tube, a discharge-side transparent window is formed on the peripheral wall surface of the rice grain discharge tube, and the intermediate product whiteness sensor detects the whiteness of the intermediate product rice grains through the discharge-side transparent window.

[0023] The present invention provides It is preferable that the pounding accuracy adjustment means includes at least one of a pressure lid provided at the discharge outlet of the rice grain discharge section, the polishing roll disposed in the polishing section, and a shutter provided in the rice grain supply section, and controls at least one of the pressure level of the pressure lid, the rotation speed of the polishing roll, and the opening degree of the shutter. [Effects of the Invention]

[0024] The rice polishing machine of the present invention is equipped with a raw material whiteness sensor that detects the whiteness of raw material rice grains before polishing, and a product whiteness sensor that detects the whiteness of finished rice grains after polishing. The control unit controls the polishing accuracy adjustment means so that the increase in whiteness of the finished rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the finished rice grains detected by the product whiteness sensor, matches the target value for increase in whiteness of the finished rice grains that is set in accordance with the target yield value. This allows the whiteness of the rice grains before and after polishing to be measured instantly and accurately by each whiteness sensor, and enables highly accurate yield control in real time based on the change in the whiteness of the rice grains before and after polishing (whiteness increase). In the rice polishing machine of the present invention, if the rice grain supply section in which the raw material whiteness sensor is installed has a rotary valve, a supply-side transparent window is formed on the flow path wall of the rotary valve, and the raw material whiteness sensor detects the whiteness of the raw material rice grains through the supply-side transparent window, the frictional action of the raw material rice grains that are steadily supplied at high speed in a dense state between the flow path wall of the rotary valve and the rotor blades can prevent bran from adhering to the inner surface of the supply-side transparent window, and the whiteness of the raw material rice grains can be accurately detected by the raw material whiteness sensor. In the rice polishing machine of the present invention, if the rice grain discharge section in which the product whiteness sensor is installed has a rice grain discharge tube, a discharge-side transparent window is formed on the peripheral wall surface of the rice grain discharge tube, and the product whiteness sensor detects the whiteness of the product rice grains through the discharge-side transparent window, the frictional action of the individual product rice grains rotating at high speed can prevent bran from adhering to the inner surface of the discharge-side transparent window, so the product whiteness sensor can accurately detect the whiteness of the product rice grains.

[0025] The rice polisher of the present invention is a stand-alone rice polisher that has a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and is equipped with one polishing section in which a polishing chamber is formed between the perforated cylinder and the polishing roll, and is provided with a rice grain supply section at one end of the polishing chamber and a rice grain discharge section at the other end, and polishes rice grains in the polishing chamber. The rice grain supply section is provided with the raw material whiteness sensor, and the rice grain discharge section is provided with the product whiteness sensor, and the control section is configured to If the milling accuracy adjustment means is controlled so that the increase in whiteness of the product rice grains, calculated from the whiteness of the product rice grains detected by the product whiteness sensor, matches the target increase in whiteness of the product rice grains, which is set in accordance with the target yield value, the whiteness of the rice grains before and after milling can be measured instantly and accurately by each whiteness sensor, thereby enabling high-precision yield control in real time based on the change in the whiteness of the rice grains before and after milling (increase in whiteness).

[0026] The rice polishing machine of the present invention is a multi-seat rice polishing machine having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and comprising a plurality of polishing sections in which polishing chambers are formed between the perforated cylinder and the polishing roll, and each polishing chamber is provided with a rice grain supply section at one end and a rice grain discharge section at the other end, in which rice grains are moved from a first-stage polishing section to a final-stage polishing section and polished sequentially in each polishing chamber, the rice grain supply section provided at one end of the polishing chamber in the first-stage polishing section, and the product whiteness sensor provided at the rice grain discharge section provided at the other end of the polishing chamber in the final-stage polishing section, and the control section If the milling accuracy adjustment means at each stage is controlled so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target increase in whiteness of the product rice grains, which is set in accordance with the target yield value, then the whiteness of the rice grains before milling in the first stage and the whiteness of the rice grains after milling in the final stage can be measured instantly and accurately by each whiteness sensor, thereby enabling high-precision yield control in real time based on the change in the whiteness of the rice grains before and after milling (increase in whiteness).

[0027] The rice polishing machine of the present invention is a multi-stage rice polishing machine having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and including a plurality of polishing sections in which polishing chambers are formed between the perforated cylinder and the polishing roll, and each polishing chamber is provided with a rice grain supply section at one end and a rice grain discharge section at the other end, in which rice grains are moved from a first-stage polishing section to a final-stage polishing section and polished sequentially in each polishing chamber. The control unit is provided with the raw material whiteness sensor in the rice grain supply unit provided in the final stage polishing unit, the product whiteness sensor in the rice grain discharge unit provided on the other end side of the polishing chamber in the final stage polishing unit, and an intermediate product whiteness sensor for detecting the whiteness of intermediate product rice grains during polishing in the rice grain discharge unit provided on the other end side of each polishing chamber in each polishing unit other than the final stage, and the control unit is provided with the raw material whiteness sensor in the rice grain supply unit provided in the final stage polishing unit, the product whiteness sensor in the rice grain discharge unit provided on the other end side of each polishing chamber in the polishing unit If the milling accuracy adjustment means at each stage is controlled so that the increase in whiteness of intermediate-product rice grains determined from the whiteness of intermediate-product rice grains detected by the intermediate-product whiteness sensor matches the target value for the increase in whiteness of intermediate-product rice grains that is set within the range of the target value for the increase in whiteness of product rice grains, and so that the increase in whiteness of the product rice grains determined from the whiteness of raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor matches the target value for the increase in whiteness of the product rice grains that is set corresponding to the target value for yield, then the whiteness of the rice grains before milling in the first stage and the whiteness of the rice grains after milling in the final stage can be measured instantly and accurately by the raw material whiteness sensor and the product whiteness sensor, respectively, and highly accurate yield control can be performed in real time based on the change in the whiteness of the rice grains before and after milling (whiteness increase). Furthermore, the rice polishing machine of the present invention sets target values ​​for the increase in rice grain whiteness in stages, and can instantly and accurately measure the whiteness of rice grains before polishing, during polishing, and after polishing using each whiteness sensor, thereby enabling more precise yield control in real time based on the change in the whiteness of rice grains (increase in whiteness) before polishing and after polishing has begun.

[0028] The rice milling machine of the present invention comprises a setting unit that allows the target value of yield to be input and set, and a registration unit that allows the correspondence between yield values ​​and whiteness increase values ​​to be stored and registered in a table in advance, and the control unit refers to the table in the registration unit based on the target value of yield input and set by the setting unit, reads the corresponding whiteness increase value from the table, and sets the target value of whiteness increase of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness increase value of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value of whiteness increase of the product rice grains.In this case, high-precision yield control can be performed in real time with a simple operation in which the operator simply inputs and sets the target value of yield.

[0029] The rice milling machine of the present invention comprises a setting unit that enables the user to select a type of raw material rice grain and input and set a target value for the yield, and a registration unit that enables the user to store and register in advance in a table the correspondence between the yield value and the whiteness increase value for each type of raw material rice grain, wherein the control unit refers to the table in the registration unit based on the target value for the yield that is input and set by selecting the type of raw material rice grain using the setting unit, reads out the corresponding whiteness increase value from the table, and sets the target value for the whiteness increase of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness increase value of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value for the whiteness increase of the product rice grains.High-precision yield control can be performed in real time with a simple operation in which an operator selects the type of raw material rice grain and inputs and sets the target value for the yield.

[0032] In the rice polishing machine of the present invention, the rice grain discharge section in which the intermediate product whiteness sensor is installed has a rice grain discharge tube, a discharge-side transparent window is formed on the peripheral wall surface of the rice grain discharge tube, and the intermediate product whiteness sensor detects the whiteness of the intermediate product rice grains through the discharge-side transparent window.This prevents bran from adhering to the inner surface of the discharge-side transparent window due to the friction between the intermediate product rice grains rotating at high speed, so the whiteness of the intermediate product rice grains can be accurately detected by the intermediate product whiteness sensor. [Brief explanation of the drawings]

[0033] [Figure 1] 1 is a cross-sectional view of a main portion of a rice polishing machine according to an embodiment of the present invention. [Figure 2] Control block diagram of a rice milling machine. [Figure 3] An explanatory diagram of the setting section of a rice polishing machine. [Figure 4] FIG. 10 is a cross-sectional view of a main portion of a rice polisher according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a main part of a rice polishing machine according to an embodiment of the present invention. The rice polisher 1 in the embodiment of the present invention is a single-unit horizontal rice polisher and includes one polishing unit 3. The polishing section 3 has a cylindrical or polygonal polishing tube made of a porous wall such as wire mesh, in this case a rice polishing screen 31 with slits provided all over the screen, and a polishing roll 32 rotatably disposed within the rice polishing screen 31, and a polishing chamber 33 in which rice grains are polished is formed between the rice polishing screen 31 and the polishing roll 32. The polishing unit 3 can adjust the amount of stirring of the rice grains in the polishing chamber 33 by adjusting the rotation speed of the polishing roll 32.

[0035] A rice grain supplying section 2 is provided at one end of the polishing chamber 33, and a rice grain discharging section 4 is provided at the other end. The rice grain supply section 2 has a cylindrical grain feed tube 21 and a screw roll 22 that is rotatably arranged within the grain feed tube 21 and coaxially with the polishing roll 32, and a grain feed chamber 23 is formed between the grain feed tube 21 and the screw roll 22 to transport raw rice grains (brown rice) before polishing to the polishing chamber 33.

[0036] The grain feeder 21 has a raw material supply port 24 formed at the top of one end, and a raw material supply tube 25 is disposed in the raw material supply port 24, while the other end is open. The screw roll 22, together with the polishing roll 32, is mounted on a main shaft 26 which is rotated by a drive motor (not shown).

[0037] The rice grain supply unit 2 has a raw material supply conduit 27 connected to the raw material supply tube 25, and a rotary valve 28 provided at the top of the raw material supply conduit 27. In addition, the raw material supply conduit 27 is provided with a shutter (not shown). The rice grain supply unit 2 can adjust the amount of raw rice grains supplied onto the shutter by changing the rotation speed of the rotary valve 28, and can adjust the amount of raw rice grains supplied into the grain transfer bin 21 by changing the opening degree of the shutter.

[0038] A transparent window (not shown) made of glass, resin, etc. is formed on the wall of the case of the rotary valve 28. An ingredient whiteness sensor 51 that detects the whiteness of the raw material rice grains is provided on the outer surface of the case of the rotary valve 28, and the ingredient whiteness sensor 51 detects the whiteness of the raw material rice grains through the transparent window.

[0039] In the rotary valve 28, the friction of the raw material rice grains, which are supplied steadily at high speed in a dense state between the inner surface of the case and the rotor blades, prevents bran from adhering to the inner surface of the transparent window, and the raw material whiteness sensor 51 can accurately detect the whiteness of the raw material rice grains.

[0040] The rice grain discharge section 4 has a cylindrical or polygonal rice grain discharge duct 41 that is provided at the other end of the polishing chamber 33 and to which polished product rice grains (polished rice) are transferred, and a rice grain discharge trough 43 that is provided to communicate with a rice grain discharge opening 42 formed in the rice grain discharge duct 41. In addition, a pressure lid 44 is provided on the rice grain discharge trough 43 to close the rice grain discharge opening 42. The rice grain discharge unit 4 can adjust the discharge amount of product rice grains by adjusting the pressure of the pressure lid 44.

[0041] A transparent window (not shown) made of glass, resin, etc. is formed on the peripheral wall surface of the rice grain discharge tube 41. A product whiteness sensor 52 that detects the whiteness of the product rice grains is provided on the outer surface of the rice grain discharge tube 41, and the product whiteness sensor 52 detects the whiteness of the product rice grains through the transparent window.

[0042] In the rice grain discharge tube 41, the frictional action of the individual product rice grains rotating at high speed prevents bran from adhering to the inner surface of the transparent window, and the product whiteness sensor 52 can accurately detect the whiteness of the product rice grains.

[0043] In addition, the product whiteness sensor 52 can also be installed in any location below the rice grain discharge outlet 42 where the whiteness of the product rice grains can be detected, such as on the outer surface of the rice grain discharge trough 43.

[0044] In the polishing section 3, the polishing roll 32 is formed with a plurality of air nozzles (not shown), and air is supplied from an air blower fan (not shown) through a hollow portion (not shown) in the main shaft 26 and sprayed from the air nozzles. A dust collection chamber 34 is provided around the polishing chamber 33 between the rice polishing screen 31 and the rice polishing machine body, and the dust collection chamber 34 communicates with a dust collection duct 35 provided below.

[0045] In the rice polishing machine 1 according to the embodiment of the present invention, the raw rice grains supplied from the rotary valve 28 onto the shutter of the raw material supply trough 27 are sent to the raw material supply port 24 via the raw material supply tube 25, and are supplied from the raw material supply port 24 into the grain transfer chamber 23. The raw rice grains supplied to the grain sending chamber 23 are then transported by the screw roll 22 to the polishing chamber 33 side. At this time, the whiteness of the raw material rice grains is detected by the raw material whiteness sensor 51 provided on the outer surface of the case of the rotary valve 28.

[0046] The raw rice grains transferred to the polishing chamber 33 are agitated by the polishing roll 32 and polished by friction between the rice grains as they move toward the rice grain discharge tube 41. After being polished in the polishing chamber 33, the product rice grains push open the pressure lid 44 that is provided to close the rice grain discharge port 42 and are discharged from the rice grain discharge trough 43. At this time, the whiteness of the product rice grains is detected by the product whiteness sensor 52 provided on the outer surface of the rice grain discharge tube 41.

[0047] In the polishing chamber 33, bran is generated by polishing the raw rice grains, and the bran is discharged by air blown from the blower holes formed in the polishing roll 32 through the slits in the rice polishing screen 31 and into the dust collection duct 35 via the dust collection chamber 34.

[0048] Figure 2 shows a control block diagram of a rice milling machine. Figure 3 shows an explanatory diagram of an example of a setting unit of a rice milling machine. The rice polishing machine 1 in the embodiment of the present invention is equipped with a control unit 6 that feedback-controls the pressure lid 44 provided at the rice grain discharge port 42 of the rice grain discharge unit 4, the polishing roll 32 disposed in the polishing unit 3, and the polishing accuracy adjustment means 7 such as the shutter provided in the raw material supply trough 27, based on the whiteness increase value (whiteness increase) of the product rice grains determined from the whiteness of the raw material rice grains before polishing and the whiteness of the product rice grains after polishing.

[0049] The control unit 6 includes a setting unit 61 that can set a target yield value for each type of raw material rice grain during milling processing, and a registration unit 62 that stores and registers in advance the correspondence between the yield value and the whiteness increase value for each type of raw material rice grain.

[0050] The setting unit 61 is, for example, an operation panel provided on a control panel, and the setting screen shown in Figure 3 has an adjustment button 611 for adjusting the target value of yield and a setting button 612 for setting the target value of yield. The setting screen of the setting unit 61 is provided with a target yield value display section 613 that displays the target value of yield, and the operator can select the type of raw material rice grain on a selection screen (not shown) and set the target value of yield while checking the numerical value displayed in the target yield value display section 613.

[0051] The registration unit 62 is a storage device provided, for example, on a control panel, and can store and register in advance in a table the correspondence between the yield value and the whiteness increase value for each type of raw material rice grain, along with raw material information for the raw material rice grains, for example, from an input screen (not shown) on the operation panel. The raw material information of the raw material rice grains may include the place of origin, variety, year of production, grade, producer, etc., as well as the proportion of mixed rice used in the case of mixed rice.

[0052] The control unit 6 refers to the table in the registration unit 62 based on the target yield value input and set by the operator by selecting the type of raw rice grains in the setting unit 61, reads the corresponding whiteness increase value from the table, and sets the target value for the increase in whiteness of the product rice grains.

[0053] The control unit 6 then determines a value for the increase in whiteness of the product rice grains based on the whiteness of the raw material rice grains detected by the raw material whiteness sensor 51 and the whiteness of the product rice grains detected by the product whiteness sensor 52, compares the value for the increase in whiteness of the product rice grains with a target value for the increase in whiteness of the product rice grains, and controls the pressure level of the pressure lid 44 in the pounding accuracy adjustment means 7, the rotation speed of the polishing roll 32, the opening degree of the shutter, etc., so that the value for the increase in whiteness of the product rice grains matches the target value for the increase in whiteness of the product rice grains.

[0054] Here, the control unit 6 can set a target value for the whiteness of the product rice grains after milling based on the whiteness of the raw material rice grains detected by the raw material whiteness sensor 51 and the target value for the increase in whiteness of the product rice grains, compare the whiteness of the product rice grains detected by the product whiteness sensor 52 with the target whiteness value, and control the milling accuracy adjustment means so that the whiteness of the product rice grains matches the target whiteness value.

[0055] The setting unit 61 is provided with a product yield value display unit 614 that displays the yield value of the product rice grains, and can refer to the table in the registration unit 62 based on the increase in whiteness of the product rice grains calculated from the difference between the whiteness of the raw rice grains and the whiteness of the product rice grains, read out the corresponding yield value from the table, and display the product yield value on the product yield value display unit 614.

[0056] The rice polisher 1 in the embodiment of the present invention is a stand-alone rice polisher that includes one polishing unit 3, and has a rice grain supply unit 2 on one end side of the polishing chamber 33 and a rice grain discharge unit 4 on the other end side, and polishes rice grains in the polishing chamber 33. The rice grain supply unit 2 is provided with the raw material whiteness sensor 51, and the rice grain discharge unit 4 is provided with the product whiteness sensor 52. The control unit 6 controls the whiteness of the raw material rice grains detected by the raw material whiteness sensor 51 and the product whiteness sensor 52. The milling accuracy adjustment means 7 is controlled so that the increase in whiteness of the product rice grains, calculated from the whiteness of the product rice grains milled, matches the target increase in whiteness of the product rice grains, which is set in response to the target yield value input by the operator. This allows the whiteness sensors 51, 52 to instantly and accurately measure the whiteness of the raw rice grains and the whiteness of the product rice grains, respectively, and enables highly accurate yield control in real time based on the change in the whiteness of the rice grains before and after milling (whiteness increase).

[0057] FIG. 4 shows a cross-sectional view of a main part of a rice polisher according to another embodiment of the present invention. A rice polishing machine 1 according to another embodiment of the present invention is a horizontal rice polishing machine of a linked seating type, and includes three polishing units 3 that are stacked one above the other and linked in series. In the multi-seat rice milling machine 1, each milling section 3 has a rice grain supply section 2 at one end of each milling chamber and a rice grain discharge section 4 at the other end, and the rice grains are moved from the first milling section 3 to the final milling section 3 and milled sequentially in each milling chamber. The configuration of each of the milling units 3 is the same as that of the single-unit horizontal rice milling machine shown in FIG. 1, and detailed description thereof will be omitted here.

[0058] In the linked rice milling machine 1, the raw material whiteness sensor 51 is provided in the rice grain supply section 2 provided at one end of the polishing chamber in the first-stage polishing section 3, and the product whiteness sensor 52 is provided in the rice grain discharge section 4 provided at the other end of the polishing chamber in the final-stage polishing section 3. The raw material whiteness sensor 51 detects the whiteness of raw material rice grains (brown rice) before polishing, and the product whiteness sensor 52 detects the whiteness of product rice grains (polished rice) after polishing.

[0059] The multi-seat rice milling machine 1 is equipped with a control unit similar to that of the single-unit rice milling machine shown in Figure 1. The control unit refers to a table in the registration unit based on the target yield value input and set by the operator by selecting the type of raw rice grains in the setting unit, reads the corresponding whiteness increase value from the table, and sets the target value for the increase in whiteness of the finished rice grains.

[0060] The control unit then determines the increase in whiteness of the product rice grains based on the whiteness of the raw material rice grains detected by the raw material whiteness sensor 51 and the whiteness of the product rice grains detected by the product whiteness sensor 52, compares the increase in whiteness of the product rice grains with a target value for the increase in whiteness of the product rice grains, and controls the pounding accuracy adjustment means at each stage, i.e., the pressure of the pressure lids provided at the discharge openings of each rice grain discharge unit 4, the rotation speed of the polishing rolls arranged in each polishing unit 3, the opening degree of the shutters provided in each rice grain supply unit 2, etc., so that the increase in whiteness of the product rice grains matches the target value for the increase in whiteness of the product rice grains.

[0061] Here, in another embodiment of the present invention, the linked-seat rice milling machine 1 can arbitrarily adjust the milling accuracy in each milling section 3 according to the milling method, such as grinding type or friction type.

[0062] A rice polishing machine 1 in another embodiment of the present invention is a multi-seat rice polishing machine that includes a plurality of polishing sections 3, each having a rice grain supply section 2 at one end of the polishing chamber and a rice grain discharge section 4 at the other end, and moves rice grains from the first polishing section 3 to the final polishing section 3 and polishes them sequentially in each polishing chamber, and the rice grain supply section 2 is provided at one end of the polishing chamber in the first polishing section 3, and the product whiteness sensor 52 is provided at the rice grain discharge section 4 at the other end of the polishing chamber in the final polishing section 3, and the control section The milling accuracy adjustment means at each stage is controlled so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by 51 and the whiteness of the product rice grains detected by the product whiteness sensor 52, matches the target increase in whiteness of the product rice grains, which is set in accordance with the target yield value.This makes it possible to instantly and accurately measure the whiteness of the raw material rice grains at the first stage and the whiteness of the product rice grains at the final stage using the whiteness sensors 51, 52, and to perform highly accurate yield control in real time based on the change in the whiteness of the rice grains before and after milling (increase in whiteness).

[0063] In another embodiment of the rice polishing machine 1 of the present invention, an intermediate product whiteness sensor 53 for detecting the whiteness of intermediate product rice grains during polishing can be provided in the rice grain discharge section 4 provided at the other end of each polishing chamber in the polishing section 3 of each stage other than the final stage, in this case the first and second polishing sections 3.

[0064] The control unit can control the pounding accuracy adjustment means at each stage so that the increase in whiteness of intermediate-product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor 51 and the whiteness of the intermediate-product rice grains detected by the intermediate-product whiteness sensor 53, matches the target value for the increase in whiteness of intermediate-product rice grains, which is set within the range of the target value for the increase in whiteness of the product rice grains, and so that the increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor 51 and the whiteness of the product rice grains detected by the product whiteness sensor 52, matches the target value for the increase in whiteness of the product rice grains, which is set corresponding to the target value for yield.

[0065] Here, the target value for the increase in whiteness of the intermediate rice grains can be set manually by an operator or automatically by the control unit within the range of the target value for the increase in whiteness of the product rice grains, depending on, for example, the number of polishing units and the polishing method of the polishing units at each stage.

[0066] In another embodiment of the present invention, the rice polishing machine 1 sets a target value for the increase in rice grain whiteness in stages for each polishing section 3, and detects the whiteness of the intermediate-product rice grains using the intermediate-product whiteness sensor 53.This allows the whiteness of the raw rice grains, the whiteness of the intermediate-product rice grains, and the whiteness of the finished rice grains to be measured instantly and accurately by each whiteness sensor 51, 52, 53, and therefore enables more precise yield control in real time based on the change in the whiteness of the rice grains (increase in whiteness) before polishing and after polishing begins.

[0067] In other embodiments of the present invention, the intermediate product whiteness sensor 53 is not essential, and can be provided or used as needed.

[0068] In another embodiment of the present invention, the multi-seat rice milling machine has multiple milling units 3 stacked one above the other and connected in series, but it is also possible to connect multiple stand-alone rice milling machines, each equipped with one milling unit 3, in series to form a multi-seat rice milling machine equipped with multiple milling units.

[0069] In the embodiment of the present invention, in the stand-alone rice polishing machine 1, the polishing roll 32 is described as a friction type roll, but this is not limited to this and it can also be, for example, a grinding type roll.

[0070] Furthermore, in the embodiment of the present invention, the multi-stage rice milling machine 1 can have different milling methods in the milling sections 3 at each stage, for example, by using a grinding roll in the first stage and a friction roll in the second stage.

[0071] In the embodiment of the present invention, the rice polisher 1 has been described as a horizontal rice polisher by way of example, but it may also be a vertical rice polisher.

[0072] The present invention is not limited to the above-described embodiment, and it goes without saying that the configuration can be appropriately modified without departing from the scope of the invention. [Industrial Applicability]

[0073] The rice polishing machine of the present invention is extremely useful as it can perform high-precision yield control in real time. [Explanation of symbols]

[0074] 1 rice milling machine 2 Rice grain supply section 21 Grain barrel 22 Screw Roll 23 Grain sending room 24 Raw material supply port 25 Raw material supply tube 26 Spindle 27 Raw material supply trough 28 Rotary Valve 3 Seishinbu 31 Rice polishing screen 32 White Roll 33 Semen chamber 34 Dust collection chamber 35 Dust collection duct 4 Rice grain discharge section 41 Rice grain ejector 42 Rice grain outlet 43 Rice grain discharge gutter 44 Pressure Lid 51 Raw material whiteness sensor 52 Product whiteness sensor 53 Whiteness sensor for intermediate products 6 Control Unit 61 Setting section 611 Adjustment button 612 Settings button 613 Target yield value display unit 614 Product yield value display section 62 Registration Department 7 Pounding precision adjustment means

Claims

1. a pounding accuracy adjusting means for adjusting the pounding accuracy of rice grains; A control unit that controls the milling accuracy adjustment means, The rice polishing machine includes at least one polishing unit having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, with a polishing chamber formed between the perforated cylinder and the polishing roll, and a rice grain supply unit provided at one end of the polishing chamber and a rice grain discharge unit provided at the other end thereof, and polishes the rice grains in the polishing chamber; The system is equipped with a raw material whiteness sensor that detects the whiteness of raw material rice grains before polishing, and a product whiteness sensor that detects the whiteness of product rice grains after polishing, the rice grain supply unit in which the raw material whiteness sensor is provided has a rotary valve, a supply-side transparent window is formed on a flow path wall surface of the rotary valve, and the raw material whiteness sensor detects the whiteness of the raw material rice grains through the supply-side transparent window; The control unit controls the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, coincides with a target value for the increase in whiteness of the product rice grains, which is set in accordance with a target value for yield.

2. A pounding accuracy adjusting means for adjusting the pounding accuracy of rice grains; A control unit that controls the milling accuracy adjustment means, The rice polishing machine includes at least one polishing unit having a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, with a polishing chamber formed between the perforated cylinder and the polishing roll, and a rice grain supply unit provided at one end of the polishing chamber and a rice grain discharge unit provided at the other end thereof, and polishes the rice grains in the polishing chamber; The system is equipped with a raw material whiteness sensor that detects the whiteness of raw material rice grains before polishing, and a product whiteness sensor that detects the whiteness of product rice grains after polishing, The rice grain discharge section in which the product whiteness sensor is provided has a rice grain discharge tube, and a discharge-side transparent window is formed on the peripheral wall surface of the rice grain discharge tube, and the product whiteness sensor detects the whiteness of the product rice grains through the discharge-side transparent window, The control unit controls the pounding accuracy adjustment means so that the increase in whiteness of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, coincides with a target value for the increase in whiteness of the product rice grains, which is set in accordance with a target value for yield.

3. A multi-stage rice milling machine has a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and is provided with a plurality of polishing sections in which polishing chambers are formed between the perforated cylinder and the polishing roll, and each polishing chamber has a rice grain supply section at one end and a rice grain discharge section at the other end, in which rice grains are moved from a first-stage polishing section to a final-stage polishing section and polished sequentially in each polishing chamber, The raw material whiteness sensor is provided in the rice grain supply section provided at one end of the polishing chamber in the first-stage polishing section, and the product whiteness sensor is provided in the rice grain discharge section provided at the other end of the polishing chamber in the final-stage polishing section, 3. The rice milling machine according to claim 1, wherein the control unit controls each pounding accuracy adjustment means at each stage so that a value of increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches a target value of increase in whiteness of the product rice grains, which is set in correspondence with the target value of yield.

4. A multi-stage rice milling machine has a perforated cylinder and a polishing roll rotatably disposed within the perforated cylinder, and is provided with a plurality of polishing sections in which polishing chambers are formed between the perforated cylinder and the polishing roll, and each polishing chamber has a rice grain supply section at one end and a rice grain discharge section at the other end, in which rice grains are moved from a first-stage polishing section to a final-stage polishing section and polished sequentially in each polishing chamber, The raw material whiteness sensor is provided in the rice grain supply section provided at one end of the polishing chamber in the first-stage polishing section, the product whiteness sensor is provided in the rice grain discharge section provided at the other end of the polishing chamber in the final-stage polishing section, and an intermediate product whiteness sensor for detecting the whiteness of intermediate product rice grains during polishing is provided in the rice grain discharge section provided at the other end of each polishing chamber in each polishing section other than the final stage, 4. The rice milling machine according to claim 3, wherein the control unit controls each pounding accuracy adjustment means at each stage so that a value of increase in whiteness of intermediate-product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the intermediate-product rice grains detected by the intermediate-product whiteness sensor, matches a target value of increase in whiteness of intermediate-product rice grains that is set within a range of the target value of increase in whiteness of the product rice grains, and so that a value of increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches a target value of increase in whiteness of the product rice grains that is set corresponding to the target value of yield.

5. a setting unit that allows the target value of the yield to be input and set; a registration unit that can store and register in advance the correspondence between the yield value and the whiteness increase value, 5. The rice milling machine according to claim 1, wherein the control unit refers to the registration unit based on the target value of yield input and set by the setting unit, reads out the corresponding whiteness increase value from the registration unit, sets the target value of the increase in whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness increase value of the product rice grains, calculated from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, matches the target value of the increase in whiteness of the product rice grains.

6. 6. The rice milling machine according to claim 1, wherein the control unit compares a value of increase in whiteness of the product rice grains, determined from the whiteness of the raw material rice grains detected by the raw material whiteness sensor and the whiteness of the product rice grains detected by the product whiteness sensor, with a target value of increase in whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the value of increase in whiteness of the product rice grains coincides with the target value of increase in whiteness of the product rice grains.

7. 6. The rice milling machine according to claim 1, wherein the control unit sets a target value for the whiteness of the product rice grains based on the whiteness of the raw material rice grains detected by the raw material whiteness sensor and a target value for the increase in whiteness of the product rice grains, compares the whiteness of the product rice grains detected by the product whiteness sensor with the target value for the whiteness of the product rice grains, and controls the pounding accuracy adjustment means so that the whiteness of the product rice grains matches the target value for the whiteness of the product rice grains.

8. 8. The rice milling machine according to claim 1, wherein the milling accuracy adjustment means includes at least one of a pressure lid provided at the discharge port of the rice grain discharge section, the milling roll disposed in the milling section, and a shutter provided in the rice grain supply section, and controls at least one of the pressure of the pressure lid, the rotation speed of the milling roll, and the opening degree of the shutter.

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