JP2006341160A - Coin rice mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct rice milling resistance by a measuring result of parameters about milling degree of milled rice after actual milling. <P>SOLUTION: This coin rice mill is provided with a brown rice taking-in device 9 continued from a brown rice charge hopper 5, a stone remover 10, a rice milling device 11, a milled rice tank 6, and a control device. Multiple milling degree switches 49 are provided on an operation panel 8, rice milling resistance of the rice milling device is set on a rice milling resistance setting part of the control device according to the rice milling degree, and the rice milling resistance is determined based on the set value of the rice milling resistance setting part, to mill rice. A brown rice thermometer 17 is provided in a brown rice transfer route, a milled rice thermometer 36 is provided in a milled rice discharge route. The control device has a temperature difference setting part setting the temperature difference before and after milling in a correlation to the milling degree, and a correction part correcting the milling resistance. The correction part corrects the actually measured temperature difference obtained from the brown and milled rice thermometers to coincide with the set value of the temperature difference setting part corresponding to a selected milling degree switch. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coin rice mill for a user to insert coins (coins) and to polish the brown rice brought by him to a desired degree of milling.

  There are three types of coin rice milling machines that polish brown rice according to the amount of money spent by customers, so that you can select the whiteness of white rice (the degree of milling): “7 buchi”, “standard”, and “upper white” Usually, a whiteness switch is provided. A structure is adopted in which the degree of milling is changed by adjusting the resistance of a resistance plate that closes the exit of the rice milling machine in accordance with the milling degree switch selected by the customer.

However, even if the resistance of the resistance plate is the same, the degree of milling varies depending on the amount of water contained in the brown rice. That is, high-moisture rice with a large amount of water in brown rice is soft, so that the degree of whitening tends to increase accordingly. On the other hand, low-moisture rice with a low moisture content of brown rice tends to decrease the degree of milling because the brown rice itself is hard. Therefore, what has measured the moisture content of brown rice and correct | amends the resistance of a resistance board is developed (patent document 1).
JP 2001-149803 A

  However, since this corrects the resistance of the resistance plate (milling resistance) in accordance with a preset correction factor, the milling degree of the actual milled rice matches the milling degree selected with the milling degree switch. Not always. That is, the degree of whiteness of white rice does not match the needs of the customers. This is because, as a parameter affecting the degree of milling, there is at least the temperature of brown rice in addition to the amount of water.

  Brown rice is usually stored at room temperature in ordinary households. Therefore, it will be influenced by the outside air temperature, the temperature of brown rice will be high in summer, and the cocoon layer with a large amount of oil and fat components will be in a soft state. On the other hand, since the cocoon layer is hard in winter, the degree of milling tends to decrease if the rice is polished. In this way, it is impossible to correct the whitening degree with only one of the parameters that has been conventionally known. In addition, the method described above does not mean that the milling degree of actually polished rice is measured and corrected to reflect the result, and it affects the degree of milling other than the brown rice temperature and the brown rice-containing water content. Considering that there may be parameters, even if the milling degree is corrected using two parameters, the milling is not necessarily performed at a desired milling degree.

  Therefore, in order to solve the above-mentioned problems, the present inventor has started the development of an invention that measures the parameters related to the degree of milling of white rice after it has been actually milled and corrects the rice milling resistance based on the measurement result.

  In addition, many customers tend to select “upper white” of the whiteness degree switch in hope of whiter white rice. However, it is known that when the temperature of polished white rice increases, the taste decreases. The decrease in taste is considered to be caused by the following causes. The surface of the polished white rice becomes higher than the outside air due to the frictional action during the polishing, and the water evaporates. The higher the degree of polished rice, the more the amount of water evaporated, and the difference in the amount of water between the center and the surface of the polished white rice becomes cracked, resulting in a decrease in taste due to the crack. Therefore, customers tend to know the temperature of white rice after milling from the perceived temperature, and select and use a machine that does not raise the temperature more than necessary. Therefore, in response to the needs of customers, we have also developed information on the temperature of polished rice after milling.

  By the way, the degree of milling is a value determined by the yield of milled rice, and is obtained using a calculation formula of weight of milled rice ÷ brown rice weight × 100. From this calculation formula, for example, when the degree of whitening is “7 bumps”, the yield is 93 to 94%, when “standard”, the yield is 90 to 91%, and when “high white”, the yield is 88 to 89%. It is decided well.

  As a result of research, the present inventor has found that the difference between the brown rice temperature and the white rice temperature, that is, the temperature difference between the rice before and after the polishing, has a correlation with the rice yield (milling degree). FIG. 8 shows the correlation. As a result, it can be seen that the temperature difference is proportionally increased as the milling yield decreases. This result was obtained regardless of the brown rice water content and the brown rice temperature.

  Therefore, the present inventor compares the temperature of the brown rice introduced by the customer with the temperature of the white rice immediately after the rice is actually polished, and corrects the rice milling resistance of the rice milling machine based on the temperature difference. We completed a coin mill that produces white rice with the degree of milling selected with the switch as follows.

  That is, the present invention includes a brown rice intake device, a stone removing device, a rice milling device, a white rice tank, and a control device for controlling these devices, which are communicated from the brown rice charging hopper, and a plurality of milling degree switches can be selected on the operation panel. The milling resistance setting unit of the control device sets the milling resistance of the milling device according to the milling degree of each milling degree switch, and the milling device based on the set value of the milling resistance setting unit corresponding to the selected milling degree switch The premise is a coin milling machine that determines the resistance of rice milling. The invention of claim 1 provides a brown rice thermometer for measuring the temperature of brown rice in the brown rice transport path before the milled rice, and a white rice thermometer for measuring the temperature of white rice in the white rice discharge path after the milling. Provided. The control device includes the temperature difference setting unit that sets the temperature difference between the rice before and after milling, which has a correlation with the milling degree, according to the milling degree of the milling degree switch, and the rice milling resistance of the rice milling device determined by the rice milling resistance setting unit. The correction unit has a correction unit, and the correction unit calculates the temperature difference between the actual measurement values based on the data obtained from the brown rice thermometer and the white rice thermometer, and sets the temperature difference according to the degree of milling of the selected milling degree switch. Comparing the temperature difference between the set value and the measured value of the section, if the measured value is higher than the set value, weaken the rice milling resistance, and if the measured value is lower than the set value, correct the rice milling resistance It is characterized by that. If the measured value matches the set value, the rice resistance is maintained as it is.

  Although the rice milling process of the above-described coin milling machine results in the milling to the milling degree of the milling degree switch selected by the customer, it is desirable to accurately inform the customer of the temperature rise caused by the milling. For this purpose, a temperature display part is provided on the operation panel as in the invention of claim 2, and the temperature display part displays the brown rice temperature and the white rice temperature, or the temperature difference between the rice before and after the polishing.

  The present invention has found that there is a correlation between the degree of milling and the temperature difference between the rice before and after milling, and skillfully uses this temperature difference as a parameter for correcting the rice milling resistance. The temperature difference of the measured value is measured and corrected to match the measured value with the set value determined by the temperature difference setting unit. Rice is milled at the desired degree of milling.

  In addition, since the temperature display section is provided on the operation panel, the user can grasp the temperature rise value when brown rice is milled, which also serves as a guide for model selection.

  As shown in FIGS. 1 and 2, the coin milling machine is installed in the building 1, and the building 1 is partitioned into a guest room 3 and a machine room 4 using a wall 2 and various devices. The guest room 3 has a brown rice charging hopper 5, a white rice tank 6, and an operation panel 8 (see FIG. 4) of the operation panel 7. The machine room 4 has a brown rice take-in device 9, a stone removing device 10, and a rice milling device 11 in order to take the brown rice introduced from the brown rice input hopper 5 and return it after polishing. Discharge into tank 6. In the machine room 4, a collecting cyclone 12 that separates the rice cake produced at the time of milling from air and a rice cake collection bag 13 attached to the collecting cyclone 12 are placed.

  The brown rice charging hopper 5 has a net 14 placed almost horizontally at the top thereof, and a take-up conveyor 15 of the brown rice take-in device 9 is disposed horizontally at the bottom. A rice grain detection sensor 16 and a brown rice thermometer 17 are attached between the net 14 and the intake conveyor 15. The brown rice thermometer 17 uses a thermistor as an example, and directly measures the temperature of the brown rice. The brown rice thermometer 17 may be a non-contact type using infrared rays, for example.

  The brown rice capturing device 9 includes a capturing conveyor 15 and an elevator 18. The intake conveyor 15 is driven by a motor to rotate the screw shaft 20 in a case 19 connected to the brown rice charging hopper 5. The case 19 has a U-shaped cross section on the upstream side and a cylindrical shape on the downstream side, and the brown rice taken from the upstream side is sent to the downstream side by the rotation of the screw shaft 20 and poured into the lower part of the elevator 18.

  The elevator 18 is a motor-driven bucket conveyor that pulls up the brown rice and drops the pulled brown rice onto the stone removing device 10.

  The stone removing device 10 has a hopper 21 at the upper part thereof, and a sorting plate 22 inclined in the height direction is swingably supported at the lower part of the hopper 21, and a fan 23 is arranged below the sorting plate 22. It is. The sorting plate 22 has a large number of holes over the entire surface. While the stone removing device 10 is driven, when the wind from the fan 23 blows upward from the bottom of the oscillating sorting plate 22, the stone waste mixed in the brown rice sinks due to the difference in specific gravity with the brown rice, Furthermore, it is moved and collected above the sorting plate 22 by the swinging action. On the other hand, the brown rice that has been lifted by the wind is pushed by the brown rice supplied later, is sent downstream, falls, and is fed into the rice milling apparatus 11.

  As shown in FIG. 3, the rice milling apparatus 11 has a hopper 24 at the top, and a horizontal cylindrical milling chamber 25 is connected below the hopper 24. From the brown rice charging hopper 5 to the hopper 24 of the rice milling apparatus 11 is a brown rice conveyance path. The sperm chamber 25 is formed with a cylindrical shed 26 on the downstream side thereof, and a sperm roll 27 is rotatably accommodated therein. A rice milling sensor 28 is provided at the lower part of the hopper 24. When the rice milling sensor 28 detects brown rice, the milling roll 27 is rotated by a motor, the brown rice is fed to the exit side of the milling chamber 25, and friction between the brown rices is caused. The white rice and rice bran are separated by rubbing on the mesh of the demineralization net 26. A tip portion of the cocoon recovery duct 29 is connected to the lower part of the cocoon collection chamber 25, and a removal fan (see FIG. 1) 30 is built in a room in the middle of the cocoon collection duct 29. The soot is removed, and the soot passes through the mesh of the soot removal net 26 by the suction action of the soot removal fan 30 and is collected in the collecting cyclone 12 connected to the end of the soot collection duct 29. On the other hand, the remaining white rice goes to the exit 32 of the milling chamber 25, but the resistance plate 33 uses the elastic force of the spring 34 to block the outlet 32, and the white rice fed by the milling roll 27 opposes the elastic force. The resistor plate 33 is pushed in to open the outlet 32 and pass through. White rice is discharged into the white rice tank 6 through a tubular discharge port 35 connected to the outlet 32. From the vicinity of the outlet 32 of the milling room 25 to the white rice tank 6 is a white rice discharge path. A white rice thermometer 36 is fixed to the tubular discharge port 35. The white rice thermometer 36 also uses a thermistor as an example, similarly to the brown rice thermometer 17 described above.

  The support structure for the resistance plate 33 will be described in more detail. In order to adjust the degree of whitening, an arm 37 is supported in the vicinity of the exit 32 of the sperm chamber 25 so as to be swingable with its central portion as a fulcrum C, and one end of the arm 37 is provided so that it can be pressed and released by the pressing means 38. A resistance plate 33 provided at the other end of the arm 37 is provided so as to be able to open and close the outlet 32 by utilizing its pressing and releasing. As will be described later, the coin mill is started and stopped while the outlet 32 is completely open, and the outlet 32 is usually closed elastically by a resistance plate 33 during the rice polishing. Although the exit 32 may be opened during the milling, it is just after the start of the milling or just before the milling, and the brown rice discharged from the exit is collected by another route without being sent to the white rice tank, and is again milled. 11 to prevent the rice from becoming insufficient.

  The pressing means 38 mainly changes the rice milling resistance that closes the outlet 32 by changing the degree of compression of the spring 34, and a resistance motor 39 is arranged on the outside (upper side in the drawing) of the milling chamber 25. The screw shaft 40 is directly connected, and the nut 41 and one end of the arm 37 are screwed into the screw shaft 40 with a space therebetween, and a spring 34 passed through the screw shaft 40 is interposed between the nut 41 and one end of the arm 37. is there. Since the nut 41 is held non-rotatable in the circumferential direction, the nut 41 moves forward and backward as the screw shaft 40 rotates forward or backward. Accordingly, the degree of compression of the spring 34, that is, the rice milling resistance, changes depending on the position of the nut 41. Since the position of the nut 41 is determined by the rotational speed of the resistance motor 39, a rotational dog 42 is provided at the end of the screw shaft 40 for controlling the rotational speed, and a rotational speed detection sensor 43 is provided around the rotational speed. Based on the information output from the number detection sensor 43, the rotational speed of the resistance motor 39 is controlled. Further, in order to determine the minimum and maximum compression degree of the spring 34, another moving dog 44 protrudes from the nut 41, and the moving dog 44 faces the forward limit switch 45 and the backward limit switch 46 made up of limit switches in the front-rear direction. The movement range is regulated. When the degree of compression of the spring 34 is the minimum, the spring 34 is not expanded or contracted at all, and the nut 41 is in the retreat limit position. At this position, the pressing force of the spring 34 is released, and the resistance plate 33 is opened. A gap is formed between the plate 33 and the outlet 32. Then, with the position of the retreat limit as the origin, the nut 41 is advanced by a predetermined amount, that is, the resistance motor 39 is rotated by a predetermined amount, whereby the degree of compression of the spring 34 and the resistance plate 33 blocks the outlet 32. The pressing force (rice polishing resistance) applied in the direction is increased, and the degree of milling is determined according to the pressing force.

  As shown in FIG. 4, the operation panel 7 has an operation panel 8 facing the passenger compartment on the front surface. The operation panel 8 is provided with a coin insertion port 47, an insertion amount indicator lamp 48, three whiteness switches 49 for selecting the whitening degree, temperature display units (liquid crystal panels) 50 and 51 for brown rice and white rice, and the like. is there. In addition, a control device using a microcomputer is provided in the operation panel 7, and as shown in FIG. 5, data obtained from various switches, sensors, etc. is loaded into the controller via the input interface and recorded in the memory. Is performed, and various control signals are output to a predetermined device or the like via the output interface.

  The control device is provided with a rice milling resistance setting unit so that rice milling can be performed at a degree of milling corresponding to each milling degree switch 49, and the rice milling resistance of the rice milling device is replaced with the number of revolutions of the resistance motor 39, and the number of revolutions of the resistance motor 39 is changed. It is set corresponding to each whiteness switch 49. Specifically, as shown in FIG. 8, for example, when the whiteness switch 49 is “7 bumps”, it is set to 7 rotations, “standard” is set to 10 rotations, and “upper white” is set to 13 rotations.

  In addition, the control device considers the case where the milling degree of the milling degree switch 49 selected by the customer is not milled only by the milling resistance determined by the milling resistance setting unit, and considers the temperature difference between the rice before and after the milling. A temperature difference setting unit that is set according to the degree of milling of the switch 49 and a correction unit that corrects the rice resistance determined by the rice resistance setting unit based on the set value of the temperature difference setting unit. As shown in FIG. 8, the temperature difference setting unit uses the fact that there is a correlation between the degree of whitening and the temperature difference. For example, when the degree of whitening switch 49 is “7 bumps”, the temperature difference is 8 ° C. Is set to 13 ° C., and “upper white” is set to 18 ° C.

  Further, the correction unit calculates a temperature difference between the actual measurement values from the data (temperature information) of the brown rice thermometer 17 and the white rice thermometer 36, and the temperature difference between the actual measurement values depends on the degree of milling of the selected milling degree switch 49. Compared with the set value of the temperature difference setting unit, if the measured value matches the set value, the rice milling is continued with the resistance value (rotation speed of the resistance motor 39) determined by the rice milling resistance setting unit without correcting the rice milling resistance. . On the other hand, when the actual measurement value is higher than the set value, the degree of whitening is higher than desired by the customer, and therefore a reverse rotation command, for example, a correction command for reverse rotation by one rotation is output to the resistance motor 39. Conversely, when the actual measurement value is lower than the set value, the degree of whitening is low, so a normal rotation command, for example, a correction command for normal rotation is output to the resistance motor 39. After outputting these correction commands, the temperature difference of the actual measurement value is calculated again, compared with the set value of the temperature difference setting unit, and the same processing is repeated.

  The operation and operation sequence of the above-described coin rice mill will be described with reference to FIGS. 6 and 7 with reference to FIGS. First, the user inserts coins into the coin insertion slot 47 according to the amount of brown rice brought in according to the display number 1 on the operation panel 8. Then, the number of coins inserted is detected by the charge number detecting means and displayed on the inserted amount indicator lamp 48. At the same time, the three whiteness switches 49 blink to inform the user that the operation is ready. The user puts brown rice into the slot according to the number 2 on the operation panel 8. Subsequently, the desired whiteness switch 49 is pushed according to the display number 3. Then, the selected whiteness switch 49 is turned on, and the other two switches are turned off. At the same time, the brown rice intake conveyor 15, the elevator 18 and the motor for the stone removing device 10 are activated, and the brown rice is taken in. Be started. At this point, the outlet 32 is completely open.

  When the milling degree switch 49 is pressed, a rotation command corresponding to the set value of the milling resistance setting unit corresponding to each milling degree switch 49 is sent to the resistance motor 39, and the resistance motor 39 rotates by the amount commanded from the origin to resist. The resistance force of the plate 33 is set first (the outlet 32 is elastically closed by the resistance plate 33). A brown rice thermometer 17 provided in the brown rice charging hopper 5 measures the temperature of the brown rice, and stores the measured temperature in a memory in the control device and displays it on the temperature display unit 50 for brown rice. Then, when the rice grain detection sensor 16 provided in the back | inner side of the brown rice throwing hopper 5 detects brown rice, the count of the operation time T for 1 coin is started. At this time, when brown rice is not put in, the waiting time Tn is counted, and after waiting for this time, the operation time T is counted.

  When the brown rice is fed by the intake conveyor 15, elevator 18 and stone removing device 10 and sent to the rice milling device 11, the rice milling sensor 28 detects the brown rice and activates the rice milling device motor for the milling roll 27 and the demolding fan motor. Rice milling is done. The temperature of the white rice after milling is measured by the white rice thermometer 36 installed in the tubular discharge port 35, and the temperature difference between the measured values of brown rice and white rice is calculated from the measurement result. Then, the measured value is compared with the temperature difference of the set value. If the measured value is high, the resistance motor 39 is reversed by a correction amount to weaken the rice milling resistance, and the temperature of the polished rice after the correction is remeasured. Return. On the other hand, when the actual measurement value is low, the resistance motor 39 is rotated forward by the correction amount to increase the rice milling resistance, and the process returns to the process of re-measuring the temperature of the polished white rice after the correction. These correction processes are performed until the measured value matches the set value (the measured value is neither higher nor lower than the set value). If they match, then the resistance of the milled rice is continued and the milled rice is continued, the milled rice temperature is displayed on the milled rice temperature display unit 51, and the milled rice is continued until the count of the operation time T for one coin expires. Each time the operation time T expires, the charge indicator light count is decremented, and the next operation time T is counted. If the operation time T for the final charge does not expire, the charge indicator light is again displayed. Return to the process of decrementing the count. When the operation time T for the final fee has expired, the intake conveyor motor is stopped while maintaining the count 1 of the fee indicator lamp, and after confirming that the rice milling sensor 28 does not detect brown rice, each other The motor is stopped, the charge indicator lamp count is changed to 0, the milling degree switch 49 is turned off, the resistance motor 39 is reversed to the origin, the outlet 32 is opened, and the rice milling process is terminated.

  The present invention is not limited to the above embodiment. For example, after the temperature of white rice is measured, the correction process may be performed only once by changing the resistance of the milled rice by rotating the resistance motor 39 forward and backward by a correction amount under a certain condition. If the correction process is performed once, the actually measured value and the set value almost coincide with each other. Therefore, after the correction process is performed once, it is assumed that the actually measured value and the set value match, and the process proceeds to the subsequent processes.

It is explanatory drawing which shows the whole image of a coin rice mill. It is a top view of a coin rice mill. It is an expanded sectional view of a rice milling device. It is a front view of an operation panel. It is a block diagram which shows the control system of a coin rice mill. It is a flowchart which shows the pre-process of a rice milling process. It is a flowchart which shows the post process of a rice milling process. It is a graph which shows the correlation with the temperature difference of rice before and after milling, and the degree of milling.

Explanation of symbols

5 Brown rice input hopper 6 White rice tank 8 Operation panel 9 Brown rice take-up device 10 Stone removal device 11 Rice milling device 17 Brown rice thermometer 36 White rice thermometer 49 Whiteness switch 50, 51 Temperature display section

Claims (2)

An operation panel (8) comprising a brown rice intake device (9), a stone removing device (10), a rice milling device (11), a white rice tank (6) and a control device for controlling these devices communicated from the brown rice charging hopper (5) A plurality of milling degree switches (49) are provided to be selectable, and the rice milling resistance setting unit of the control device sets and selects the rice milling resistance of the rice milling apparatus according to the degree of milling of each milling degree switch (49). In the coin milling machine for determining the milling resistance of the milling machine based on the setting value of the milling resistance setting unit corresponding to the milling degree switch (49),
A brown rice thermometer (17) for measuring the temperature of the brown rice is provided in the brown rice conveyance path before the milled rice, and a white rice thermometer (36) for measuring the temperature of the white rice is provided in the white rice discharge path after the milling,
The control device includes a temperature difference setting unit that sets the temperature difference between the rice before and after milling, which has a correlation with the milling degree, according to the milling degree of the milling degree switch (49), and the rice milling apparatus determined by the milling resistance setting unit. Having a correction part for correcting the rice milling resistance,
The correction unit calculates the temperature difference between the actual measurement values based on the data obtained from the brown rice thermometer (17) and the white rice thermometer (36), and the temperature difference according to the degree of milling of the selected milling degree switch (49). Comparing the temperature difference between the set value of the setting section and the measured value, if the measured value is higher than the set value, weaken the rice milling resistance, and if the measured value is lower than the set value, correct the rice polishing resistance. Coin milling machine characterized by   A temperature display unit (50, 51) is provided on the operation panel (8), and the temperature display unit (50, 51) displays the brown rice temperature and the white rice temperature, or the temperature difference between the rice before and after milling. A coin milling machine according to 1.

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