Rice huller

Abstract

The invention provides a rice huller. A rice huller (1) is provided with: a pair of a first hulling roller (12) and a second hulling roller (13); a first driven pulley (8) and a second driven pulley (9) rotationally integrally provided on each of the double rollers (12, 13); and a control unit (20) for controlling the gap adjustment mechanism (10) to increase the gap (GA) between the two rollers (12, 13) when the sliding state of the flat belt (11) with respect to the two driven pulleys (8, 9) is detected by the first rotational speed sensor (17) and the second rotational speed sensor (18).

Description

Technical Field

[0001] The present invention relates to a rice husking machine using a flat belt to drive a pair of husking rolls. Background Art

[0002] In the past, a rice husker that husks rice using a pair of husking rollers whose outer circumferential surfaces are arranged side by side and face each other is generally known. For example, the rice husker disclosed in Patent Document 1 includes: a driving pulley driven to rotate by a driving motor, driven pulleys respectively arranged on a pair of husking rollers to rotate integrally, and a flat belt wound on the driving pulley and the driven pulley. Moreover, by the rotational drive of the driving motor, the pair of husking rollers rotate in opposite directions and at different circumferential speeds via the flat belt, and the rice supplied to the gap between the two rollers is passed through the gap by the rotational action of the two rollers, and the rice is sheared and broken by the circumferential speed difference of the two rollers to remove the rice husk. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent No. 7074220 Summary of the invention -Problems to be solved by the invention-

[0004] However, as described above, when using a rice husker for husking, for example, if rice with stalks is entangled with each other and stuck in a block-like state in the upstream area of ​​a pair of husking rollers inside the rice husker, the supply of rice to the gap between the two rollers may be temporarily stagnant. In this case, since there is no rice between the pair of husking rollers, the outer peripheral surfaces of the two rollers are in contact with each other, and the two rollers rotate at the same circumferential speed. As a result, the circumferential speed difference of the two rollers disappears and the shearing destruction of the rice husk cannot be completed, so the rice cannot be properly husked. In order to avoid this situation, it is considered to utilize the phenomenon that the flat belt will slide relative to the driven belt and run idly when the outer peripheral surfaces of a pair of husking rollers are in contact with each other, and the state of contact between the outer peripheral surfaces of the two rollers is grasped from the sliding state of the flat belt, so that the rice husker is stopped. However, if the rice husker is stopped immediately when the sliding state of the flat belt occurs, the operator needs to perform the recovery operation of the rice husker every time, so it is possible to deteriorate the productivity of the rice husker.

[0005] The present invention has been made in view of the above points, and its object is to provide a rice husker which can suppress the deterioration of the productivity of the rice husker caused by temporary stagnation of the supply of rice to the gap between the two rollers when a pair of husking rollers are driven by a flat belt. -Solutions to solve the problem-

[0006] In order to achieve the above object, the present invention is characterized in that, when a slip state of a flat belt relative to a driven pulley is detected, a pair of hulling rollers are separated without stopping a rice husker.

[0007] Specifically, a rice husker is taken as the object, and the rice husker includes: a pair of husking rollers, whose outer peripheral surfaces are arranged opposite to each other; a gap adjustment part, which can adjust the gap between the pair of husking rollers; a driving pulley, which is driven to rotate by a driving source; a driven pulley, which is rotatably arranged on each of the pair of husking rollers; and an annular flat belt, which is wound around the driving pulley and the driven pulley, and moves around by the rotation of the driving pulley and causes the pair of husking rollers to rotate in opposite directions and at different circumferential speeds via the driven pulley; and the following solution is adopted.

[0008] That is, in the first aspect of the invention, it is characterized in that the rice husker includes: a slip detection unit, which can detect the slip state of the flat belt relative to the driven pulley; and a control unit, which controls the gap adjustment unit to increase the gap between the pair of shelling rollers when the slip state is detected by the slip detection unit.

[0009] The invention according to claim 2 is characterized in that, in the invention according to claim 1, after the control unit increases the gap between the pair of hulling rollers, the control unit controls the gap adjusting unit to decrease the gap.

[0010] The third invention is that, in the second invention, the rice husker further comprises: a notification unit which can notify an operator of an abnormal state; when the control unit increases the gap between the pair of husking rollers and then reduces the gap a prescribed number of times, the notification unit notifies the operator of the abnormal state and stops the rice husker.

[0011] The fourth aspect of the invention is, in the third aspect of the invention, characterized in that the rice huller also includes: a tension detection unit, which can detect the tension reduction state of the flat belt; when the sliding state is detected by the sliding detection unit and the tension reduction state is detected by the tension detection unit, the control unit executes the notification unit to notify the operator of the tension reduction state and stops the rice huller.

[0012] The fifth invention is, in the first invention, characterized in that the rice husker includes: a raw material supplying section that can supply the raw material to the gap between the pair of shelling rollers; and a vibration imparting section that can vibrate the raw material supplying section.

[0013] The sixth invention is that, in the fifth invention, the rice husker also includes: a valve capable of switching between an open state in which the raw material can be supplied from the raw material supply section to the gap between the pair of husking rollers, and a closed state in which the raw material cannot be supplied from the raw material supply section to the gap between the pair of husking rollers; the control section vibrates the raw material supply section using the vibration imparting section, and switches the valve to the closed state.

[0014] A seventh aspect of the invention is the invention according to any one of the first to sixth aspects of the invention, wherein the slip detection unit is a rotation speed sensor capable of detecting the rotation speed of the driven pulley. -Effects of the Invention-

[0015] In the invention of the first aspect, even if the outer peripheral surfaces of the two rollers come into contact with each other due to a temporary stagnation in the supply of rice to the gap between the pair of hulling rollers, the sliding state of the flat belt relative to the driven pulley can be detected to grasp the state and separate the two rollers. As a result, the sliding state of the flat belt relative to the driven pulley is released, and the pair of hulling rollers automatically return to a state with a preset peripheral speed difference. Therefore, the rotation state of the two rollers can be returned to the original state without stopping the rice huller to achieve a ready state for hulling, so there is no need to stop the rice huller to achieve a ready state for hulling, and the deterioration of productivity caused by stopping the rice huller can be avoided.

[0016] In the second aspect of the invention, after the contact state of the pair of shelling rollers is released and the two rollers return to a state with a preset peripheral speed difference, the gap between the two rollers is automatically reduced. Therefore, even if the two rollers are in contact, the rice husker can be automatically restored to a rice husking state without the operator's operation.

[0017] In the third aspect of the invention, the operator can be informed of the abnormal state in which the pair of shelling rollers repeatedly contact each other. Therefore, when the state of the rice huller is in an abnormal state requiring the operator to perform a restoration operation, the operator can perform the restoration operation of the rice huller at an appropriate timing.

[0018] In the fourth aspect of the invention, the operator can know that the flat belt slips relative to the driven pulley because the tension of the flat belt decreases. Therefore, the operator can know the state of the rice husker in more detail and can perform the restoration operation of the rice husker at an appropriate time.

[0019] In the fifth aspect of the invention, even if the raw material is stuck in the raw material supply section and the supply of the raw material from the raw material supply section to the gap between the pair of shelling rollers is stagnant, the raw material can be freed from the raw material supply section by applying vibration to the raw material supply section by the vibration imparting section. Therefore, the supply of the raw material to the gap between the pair of shelling rollers can be stabilized.

[0020] In the sixth aspect of the invention, when the raw material supply section is vibrated by the vibration imparting section, the valve can be used to prevent the raw material that has been unstuck due to the vibration from being supplied from the raw material supply section to the gap between the double rollers. Therefore, even if the raw material supply section is vibrated in a state where the gap between the pair of shelling rollers is increased, the raw material supplied from the raw material supply section to the gap between the pair of shelling rollers can be prevented from directly passing through the double rollers without being properly husked.

[0021] In the seventh aspect of the invention, since the slip state of the flat belt relative to the driven pulley can be detected by the rotational speed of the driven pulley, the slip state of the flat belt relative to the driven pulley can be detected quickly compared to a detection method that generates a delay in detection, such as detecting the slip state of the flat belt relative to the driven pulley by using a change in the load current of a drive motor as a drive source. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention relates to a rice husker according to an embodiment of the present invention, and is a perspective view showing a partial internal structure. Figure 2 is along Figure 1 Schematic diagram of II arrow observation. Figure 3 is along Figure 1 Schematic diagram of III arrow observation. Figure 4 It is a control block diagram of the rice husker involved in the embodiment of the present invention. Figure 5 Yes means Figure 4 Flowchart of control processing in the control unit. Figure 6 Yes means Figure 5 The status when the judgment processing of step S3 is "Yes" is the same as Figure 3 The corresponding figure. Figure 7 Yes means Figure 5 The status when the judgment processing of step S3 is "No" and Figure 3 The corresponding figure. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the following description of the preferred embodiments is merely illustrative in nature.

[0024] Figure 1 A rice husker 1 according to an embodiment of the present invention is shown. The rice husker 1 is in the shape of a substantially rectangular plate having thickness, and includes a machine frame 2, the machine frame 2 having an inclined surface 2a extending obliquely downward formed on one side of its upper portion, and an inlet 2b for inserting rice (raw material) not shown in the figure into the machine frame 2 is provided on the upper surface of the machine frame 2.

[0025] A drive motor 3 extending in the thickness direction of the machine frame 2 is disposed at one side of the upper portion of the machine frame 2 when viewed from one side in the thickness direction, and a drive pulley 4 is rotatably mounted on one end of a motor rotation shaft 3a.

[0026] like Figure 2 As shown, a tension pulley 5 , a tension changing mechanism 6 , and a meandering control pulley 7 are disposed at a lower side of the machine frame 2 .

[0027] The tension pulley 5 is rotatably supported at the front end of a first rotating frame 5 a , and a base end of the first rotating frame 5 a is rotatably supported on the machine frame 2 .

[0028] The tension changing mechanism 6 includes a first cylinder part 6a and a first rod part 6b. The first rod part 6b can be extended or retracted by controlling the air supply and exhaust of the working air of the first cylinder part 6a. When the first rod part 6b is extended or retracted, the first rotating frame 5a rotates relative to the machine frame 2 with the base end as the center, so that the position of the tensioning wheel 5 axially supported at the front end of the first rotating frame 5a changes.

[0029] The meandering control pulley 7 is pivotally supported on the machine frame 2 at a position above the tension pulley 5 so as to be freely swingable around the swing axis C, and the pulley diameter is set smaller than the diameter of the tension pulley 5 .

[0030] A first driven pulley 8 , a second driven pulley 9 , and a gap adjustment mechanism 10 are disposed at a position on the other side of the tension pulley 5 and the tension changing mechanism 6 in the lower portion of the machine frame 2 .

[0031] The first driven pulley 8 is rotatably supported by a first support shaft r1 extending in the same direction as the motor shaft 3a. The first support shaft r1 is rotatably supported at the front end of a second rotating frame 8a, and the base end of the second rotating frame 8a is rotatably supported on the machine frame 2.

[0032] The second driven pulley 9 is disposed at a predetermined distance from the first driven pulley 8 on the other side of the first driven pulley 8 , and is rotatably supported on the machine frame 2 by a second support shaft r2 extending in the same direction as the first support shaft r1 .

[0033] The gap adjustment mechanism 10 is arranged above the first driven pulley 8 and the second driven pulley 9, and includes a second cylinder portion 10a and a second rod portion 10b. Furthermore, the second rod portion 10b can be extended or retracted by controlling the supply and exhaust of working air in the second cylinder portion 10a. When the second rod portion 10b is extended or retracted, the second rotating frame 8a rotates relative to the machine frame 2 with the base end as the center to adjust the position of the first support shaft r1 axially supported at the front end of the second rotating frame 8a.

[0034] An annular flat belt 11 is wound around the driving pulley 4, the tensioning pulley 5, the serpentine control pulley 7, the first driven pulley 8 and the second driven pulley 9 so that the annular flat belt 11 contacts the outer peripheral surfaces of the driving pulley 4, the tensioning pulley 5, the serpentine control pulley 7, the first driven pulley 8 and the second driven pulley 9.

[0035] The flat belt 11 is configured to move around by the rotation of the driving pulley 4, so that the first driven pulley 8 and the second driven pulley 9 rotate in opposite directions and at different circumferential speeds. Figure 2 As shown, when the driving motor 3 drives the driving pulley 4 to rotate in the counterclockwise direction, the flat belt 11 moves in the counterclockwise direction, so that the first driven pulley 8 wound by the flat belt 11 rotates in the clockwise direction, and the second driven pulley 9 rotates in the counterclockwise direction. At this time, since the pulley diameter of the second driven pulley 9 is smaller than the diameter of the first driven pulley 8, the second driven pulley 9 rotates at a higher peripheral speed than the first driven pulley 8.

[0036] Next, use Figure 3 , the internal structure of the rice husker 1 viewed from the other side in the thickness direction will be described.

[0037] A first shelling roller 12 is provided at a position corresponding to the opposite side of the first driven pulley 8 in the thickness direction. The first shelling roller 12 has a first rubber roller 12a at its outer peripheral portion and is fixed to the first support shaft r1, thereby rotating integrally with the first driven pulley 8. When the first driven pulley 8 is driven by the flat belt 11, as shown in FIG. Figure 3 As shown, the first hulling roller 12 connected to the first driven pulley 8 via the first support shaft r1 rotates in the counterclockwise direction.

[0038] In addition, a second shelling roller 13 is provided at a position corresponding to the opposite side of the second driven pulley 9 in the thickness direction. The second shelling roller 13 has the same pulley diameter as the first shelling roller 12. The second shelling roller 13 has a second rubber roller 13a at its outer peripheral portion and is fixed to the second support shaft r2, thereby rotating integrally with the second driven pulley 9. Moreover, when the second driven pulley 9 is driven by the flat belt 11, as shown in FIG. Figure 3 As shown, the second hulling roller 13 connected to the second driven pulley 9 via the second support shaft r2 rotates in the clockwise direction at a higher peripheral speed than the first hulling roller 12 .

[0039] A pair of first shelling rollers 12 and second shelling rollers 13 are arranged side by side so that their outer peripheral surfaces face each other and a gap GA is formed between the outer peripheral surfaces of the two rollers. The position of the first support shaft r1, that is, the position of the first shelling roller 12 mounted on the first support shaft r1, is adjusted by the telescopic action of the second rod portion 10b of the gap adjustment mechanism 10, so that the gap GA can be switched to a first state (contactable state) and a second state (separated state).

[0040] The first state (contactable state) is a state in which the first hulling roller 12 is forced toward the second hulling roller 13 by the gap adjustment mechanism 10. When there is no rice between the first hulling roller 12 and the second hulling roller 13, the first state is a state in which there is no gap GA, that is, a state in which the outer peripheral surface of the first hulling roller 12 is in contact with the outer peripheral surface of the second hulling roller 13. On the other hand, when there is rice between the first hulling roller 12 and the second hulling roller 13, the first state is a state in which a gap GA is formed to a degree corresponding to the size of the rice, that is, a state in which the outer peripheral surface of the first hulling roller 12 is separated from the outer peripheral surface of the second hulling roller 13.

[0041] The second state (separated state) is a state in which a gap GA larger than that in the first state is always formed, that is, the outer peripheral surface of the first hulling roller 12 and the outer peripheral surface of the second hulling roller 13 are completely separated regardless of whether there is rice between the first hulling roller 12 and the second hulling roller 13.

[0042] In addition, if Figure 3 As shown, a raw material supply unit 14 is provided between the input port 2b and the first and second hulling rollers 12 and 13. The raw material supply unit 14 can supply rice input from the input port 2b to the gap GA between the first and second hulling rollers 12 and 13.

[0043] The raw material supply unit 14 includes an electromagnetic vibrating feeder 14a provided directly below the input port 2b, and a material guide chute 14b provided at a lower position on the other side of the vibrating feeder 14a.

[0044] The vibrating feeder 14a includes a trough 14c capable of catching rice dropped in from the inlet 2b, and a feeder coil 14d capable of applying vibration to the trough 14c. The trough 14c is vibrated by the feeder coil 14d, thereby conveying the rice caught in the trough 14c to the other side.

[0045] The guide trough 14b is inclined at the other side of the trough 14c and above the first hulling roller 12 and the second hulling roller 13, and is located on one side as it moves downward. Moreover, the rice sent from the trough 14c to the guide trough 14b slides down from the upper surface of the guide trough 14b and is guided to the gap GA between the first hulling roller 12 and the second hulling roller 13. Moreover, when the rice passes through the gap GA, the rice husk that is sheared and damaged due to the difference in the circumferential speed of the two rollers is removed, that is, the rice is husked.

[0046] In addition, a supply valve 15 capable of opening and closing is provided at a position corresponding to the other side of the material tank 14c. Figure 7 ), the rice can be delivered from the trough 14c to the guide trough 14b, that is, the rice can be supplied from the raw material supply unit 14 to the gap GA between the first hulling roller 12 and the second hulling roller 13. On the other hand, when the supply valve 15 is in the closed state (refer to Figure 3 ), the rice cannot be sent from the material trough 14c to the material guide trough 14b, that is, the rice cannot be supplied from the raw material supply part 14 to the gap GA between the first hulling roller 12 and the second hulling roller 13. In the present embodiment, in the first state in which the first hulling roller 12 can contact the second hulling roller 13, the feeder coil 14d works, the material trough 14c vibrates, and the supply valve 15 is in an open state. On the other hand, in the second state in which the first hulling roller 12 is separated from the second hulling roller 13, the feeder coil 14d stops working, the material trough 14c does not vibrate, and the supply valve 15 is in a closed state.

[0047] In addition, a rice sensor 16 is provided above the vibrating feeder 14a, and the rice sensor 16 can detect whether there is rice, that is, whether rice is fed into the raw material supply unit 14 from the feeding port 2b. Figure 4 As shown, the rice sensor 16 is connected to the control unit 20 provided in the rice husker 1 , and transmits the detected information to the control unit 20 .

[0048] In addition, if Figure 4 As shown, in the rice husker 1, in addition to the rice sensor 16, it also includes a first rotation speed sensor 17, a second rotation speed sensor 18 and a tension pressure sensor 19, and each sensor sends the information detected by each sensor to the control unit 20. The control unit 20 has a processor 20a, which is configured to control the drive motor 3, the gap adjustment mechanism 10, the feeder coil 14d, the supply valve 15, and the display 21 according to the detection information received by the processor 20a from each sensor.

[0049] The first rotation speed sensor 17 is a sensor for detecting the rotation speed of the first driven pulley 8, and the second rotation speed sensor 18 is a sensor for detecting the rotation speed of the second driven pulley 9. Furthermore, the first rotation speed sensor 17 and the second rotation speed sensor 18 can detect the slip state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9 based on the decrease in the actual rotation speed of the first driven pulley 8 and the second driven pulley 9.

[0050] The tension pressure sensor 19 is a sensor for detecting the pressure of the working air in the first cylinder portion 6a as tension pressure corresponding to the tension of the flat belt 11. The tension pressure sensor 19 can detect the tension reduction state of the flat belt 11 based on the actual tension pressure that decreases as the tension of the flat belt 11 decreases.

[0051] The display 21 is provided at an operator-visible position on the outer surface of the machine frame 2 , and can notify the operator of an abnormal state of the rice huller 1 .

[0052] Next, use Figure 5 , the control process performed by the processor 20a of the control unit 20 is described. In this embodiment, the gap GA between the first shelling roller 12 and the second shelling roller 13 is set to the second state (separated state), the supply valve 15 is set to the closed state, the actual count is reset to 0, the drive motor 3 drives the flat belt 11, and the trough 14c is not vibrated by the feeder coil 14d. Figure 5 The control process shown starts.

[0053] In step S1, it is determined whether rice is fed into the raw material supply unit 14 from the feeding port 2b based on the detection information of the rice sensor 16. If the result of the determination is that there is rice, the process proceeds to step S2. On the other hand, if there is no rice in the storage box of the previous process due to rice clogging or the like, the determination of step S1 is repeated until it is determined that there is rice fed into the raw material supply unit 14.

[0054] In step S2, an instruction is issued to the gap adjustment mechanism 10 to switch the gap GA between the first shelling roller 12 and the second shelling roller 13 from the second state (separated state) to the first state (contactable state), and then the process proceeds to step S3. In this embodiment, in conjunction with the instruction of the gap adjustment mechanism 10 in step S2, the feeder coil 14d starts to work, the trough 14c vibrates, and the supply valve 15 switches from the closed state to the open state.

[0055] In step S3, based on the detection information of the first speed sensor 17 and the second speed sensor 18, it is determined whether the actual speed of the first driven pulley 8 and the second driven pulley 9 is below the specified speed (for example, 1000 rpm). If the result of the determination is that the actual speed of the first driven pulley 8 and the second driven pulley 9 is below the specified speed (if the determination of step S3 is "yes"), that is, if the flat belt 11 is in a slipping state (idling state) relative to the first driven pulley 8 and the second driven pulley 9, then the process proceeds to step S4. In the case where the flat belt 11 is in a slipping state, as Figure 6 As shown, the supply of rice to the gap GA between the first hulling roller 12 and the second hulling roller 13 is temporarily stopped, so that the outer peripheral surfaces of the two rollers are in contact with each other, and the two rollers rotate at the same peripheral speed, and are in a state where rice cannot be properly husked due to the difference in the peripheral speed of the two rollers. Therefore, it is also possible to consider stopping the rice husker 1 immediately. However, if the rice husker 1 is stopped immediately when the slip state of the flat belt 11 occurs, the operator needs to perform the recovery operation of the rice husker 1 every time, which may deteriorate the productivity of the rice husker 1. Therefore, in this embodiment, in order to automatically restore the rice husker 1 to a state where rice can be husked, the processing after step S4 is performed.

[0056] On the other hand, if the result of step S3 is that the actual rotation speed of the first driven pulley 8 and the second driven pulley 9 is greater than the specified rotation speed (if the result of step S3 is "No"), the flat belt 11 is in a normal state where no slippage occurs. Figure 7 As shown in FIG. 1 , the rice supplied to the gap GA between the first hulling roller 12 and the second hulling roller 13 is sheared and broken due to the circumferential speed difference between the two rollers, thereby appropriately removing the rice husk, so the processing of step S3 is repeatedly performed (the rice husker 1 continues to husker the rice) until the judgment of step S3 is "yes". Thus, during the husking of the rice, the sliding state of the flat belt 11 is always monitored.

[0057] In step S4, based on the detection information of the tension pressure sensor 19, it is determined whether the actual tension pressure is above the specified tension pressure (for example, 0.4 MPa). If the result of the determination is that the actual tension pressure is above the specified tension pressure (if the determination of step S4 is "yes"), the actual tension pressure is in a normal state, so the process proceeds to step S5. On the other hand, if the determination result of step S4 is that the actual tension pressure is less than the specified tension pressure (if the determination of step S4 is "no"), the actual tension pressure is in an abnormal state, that is, a tension reduction state, so the process proceeds to step S7, and the instruction display 21 notifies the operator of the tension reduction state. Then, the process proceeds to step S8, and after the rice huller 1 stops, the process proceeds to the end point, and the process ends.

[0058] In step S5, the gap adjustment mechanism 10 is instructed to switch the gap GA between the first shelling roller 12 and the second shelling roller 13 from the first state (contactable state) to the second state (separated state), and the supply valve 15 is instructed to switch from the open state to the closed state, and then enters step S6. When the gap adjustment mechanism 10 works according to the instruction, the first shelling roller 12 is separated from the second shelling roller 13, and the sliding state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9 is released. In this way, the rotation state of the first shelling roller 12 and the second shelling roller 13 can be automatically restored to the original state with a preset circumferential speed difference, that is, without stopping the rice husking machine 1. Figure 3 In this embodiment, the operation of the feeder coil 14d is stopped in conjunction with the switching command of the supply valve 15 in step S5, so that the trough 14c no longer vibrates.

[0059] In step S6, the gap GA between the first shelling roller 12 and the second shelling roller 13 is switched from the first state to the second state, and then it is determined whether the actual count value as the number of times of switching from the second state to the first state is greater than the specified count value (for example, 5 times). If the result of the determination is that the actual count value is greater than the specified count value (if the determination of step S6 is "yes"), the rice husker 1 is in an abnormal state requiring the operator to perform a recovery operation, so the process proceeds to step S7, and the instruction display 21 informs the operator of the abnormal state of the rice husker 1. Then, the process proceeds to step S8, and after the rice husker 1 stops, the process proceeds to the end point and ends.

[0060] On the other hand, if the result of step S6 is that the actual count value is less than the specified count value (if the determination of step S is "No"), the process proceeds to step S9. It should be noted that the "prescribed count value" in this embodiment corresponds to the "prescribed number of times" in the claims.

[0061] In step S9, the gap adjustment mechanism 10 is instructed to switch the gap GA between the first shelling roller 12 and the second shelling roller 13 from the second state (separated state) to the first state (contactable state), and the supply valve 15 is instructed to switch from the closed state to the open state, and then the process proceeds to step S10. In this embodiment, the feeder coil 14d starts to operate in conjunction with the switching instruction of the supply valve 15 in step S9, so that the trough 14c vibrates.

[0062] In step S10, the gap GA between the first shelling roller 12 and the second shelling roller 13 is switched from the first state (contactable state) to the second state (separated state), and then the actual count value of the number of times of switching from the second state to the first state is increased by 1, and the process goes to step S3 to re-judge whether the sliding state of the flat belt 11 occurs.

[0063] If the result of the re-judgment of step S3 is that the slip state of the flat belt 11 occurs (if the re-judgment of step S3 is "yes"), the rice husker 1 does not automatically recover to the rice husking state, so it enters step S4, and repeats the processing of step S5, step S9 and step S10, and the judgment processing of step S3 until the judgment processing of step S4 is "no" and the judgment processing of step S6 is "yes". On the other hand, if the result of the re-judgment of step S3 is that the slip state of the flat belt 11 does not occur (if the re-judgment of step S3 is "no"), the rice husker 1 automatically recovers to the rice husking state, so it repeats the processing of step S3 (the rice husker 1 continues to husking) until the judgment of step S3 is "yes". Thus, even in the state of recovering to the rice husking state, the slip state of the flat belt 11 can be always monitored during the rice husking.

[0064] As described above, in the present embodiment, even if the outer peripheral surfaces of the two rollers are in contact with each other due to temporary stagnation of the supply of rice to the gap GA between the pair of first hulling rollers 12 and the second hulling rollers 13, the sliding state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9 can be detected to grasp the state and separate the two rollers. As a result, the sliding state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9 is released, and the pair of first hulling rollers 12 and the second hulling rollers 13 automatically return to a state with a preset peripheral speed difference. Therefore, the rotation state of the two rollers can be returned to the original state without stopping the rice huller 1 to become a ready state for hulling, so there is no need to stop the rice huller 1 to become a ready state for hulling, and the deterioration of productivity caused by stopping the rice huller 1 can be avoided.

[0065] In addition, after the contact state of the pair of first shelling rollers 12 and the second shelling rollers 13 is released and the two rollers return to a state with a preset peripheral speed difference, the gap GA between the two rollers is automatically reduced. Therefore, even if the two rollers are in contact, the rice husking machine 1 can automatically return to a rice husking state without the operator's operation.

[0066] In addition, since the display 21 notifies the operator of the abnormal state, the operator can be informed of the abnormal state in which the pair of first shelling rollers 12 and second shelling rollers 13 repeatedly contact each other. Therefore, when the state of the rice huller 1 is an abnormal state requiring the operator to perform a restoration operation, the operator can perform the restoration operation of the rice huller 1 at an appropriate time.

[0067] In addition, since the display 21 notifies the operator of the tension reduction state, the operator can know that the flat belt 11 slips relative to the first driven pulley 8 and the second driven pulley 9 because the tension of the flat belt 11 is reduced. Therefore, the operator can know the state of the rice husker 1 in more detail, and can perform the recovery operation of the rice husker 1 at an appropriate time.

[0068] In addition, since the rotational speed of the first driven pulley 8 and the second driven pulley 9 can be used to detect the sliding state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9, the sliding state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9 can be detected quickly compared to a detection method that produces a delay in detection, such as using a change in the load current of the drive motor 3 as a drive source to detect the sliding state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9.

[0069] In addition, in this embodiment, although the example using the drive motor 3 as a drive source is described, an engine may be used instead of the drive motor 3 .

[0070] In the present embodiment, the gap adjustment mechanism 10 is configured to adjust the position of the first hulling roller 12, but may be configured to adjust the position of the second hulling roller 13, or the first hulling roller 12 and the second hulling roller 13.

[0071] In addition, in the present embodiment, the first speed sensor 17 and the second speed sensor 18 for detecting the rotational speeds of the first driven pulley 8 and the second driven pulley 9 are provided as the slip detection unit, but any one of the first speed sensor 17 and the second speed sensor 18 may be provided, and a speed sensor may be provided to detect the rotational speeds of the first support shaft r1 and the second support shaft r2, or the rotational speeds of the first shelling roller 12 and the second shelling roller 13, instead of the rotational speeds of the first driven pulley 8 and the second driven pulley 9.

[0072] In addition, in the present embodiment, the first rotation speed sensor 17 and the second rotation speed sensor 18 are used to directly detect the slip state of the flat belt 11 relative to the first driven pulley 8 and the second driven pulley 9. However, a current sensor capable of detecting the load current of the drive motor 3 or a temperature sensor capable of detecting the temperature of the first driven pulley 8 and the second driven pulley 9 may be used instead of the two rotation speed sensors to indirectly detect the slip state of the flat belt 11. In the case of using the current sensor, if the flat belt 11 slips relative to the first driven pulley 8 and the second driven pulley 9, the load current of the drive motor 3 decreases, and the slip state of the flat belt 11 can be detected based on the decrease in the load current. In addition, in the case of using the temperature sensor, if the flat belt 11 slips relative to the first driven pulley 8 and the second driven pulley 9, the flat belt 11 rubs against the first driven pulley 8 and the second driven pulley 9 to generate friction, and the temperature of the two pulleys increases, and the slip state of the flat belt 11 can be detected based on the increase in the temperature.

[0073] In addition, in the present embodiment, when the gap GA between the first hulling roller 12 and the second hulling roller 13 is in the second state (separated state), that is, when the supply valve 15 is in the closed state, the operation of the feeder coil 14d stops, but even when the supply valve 15 is in the closed state, the feeder coil 14d can be operated to vibrate the trough 14c, so that the rice can be accumulated in the downstream area of ​​the trough 14c, and the vibration level applied by the feeder coil 14d to the trough 14c can be increased compared with the case where the supply valve 15 is in the open state. Thus, the feeder coil 14d can be used as a vibration imparting part for removing the stuck rice.

[0074] In addition, although not provided in the present embodiment, a vibration imparting section (e.g., a vibration motor) capable of vibrating the raw material supply section 14 may be provided. Thus, even if the rice is stuck in the raw material supply section 14 and the supply of the rice from the raw material supply section 14 to the gap GA between the pair of first hulling rollers 12 and the second hulling roller 13 is stagnant, the rice stuck in the raw material supply section 14 can be released by applying vibration to the raw material supply section 14 using the vibration imparting section. Therefore, the supply of the rice to the gap GA between the pair of first hulling rollers 12 and the second hulling roller 13 can be stabilized. Furthermore, when the vibration imparting section is used to apply vibration to the raw material supply section 14, the supply valve 15 can be switched to a closed state. Thus, when the raw material supply section 14 is vibrated using the vibration imparting section, the supply valve 15 can be used to prevent the rice that has been released from being stuck due to the vibration from being supplied from the raw material supply section 14 to the gap GA between the two rollers. Therefore, even if the raw material supply section 14 is vibrated, for example, in a state where the gap GA between the pair of first hulling rollers 12 and the second hulling rollers 13 is increased, it is possible to prevent the rice supplied from the raw material supply section 14 to the gap GA between the pair of first hulling rollers 12 and the second hulling rollers 13 from directly passing through the double rollers without being properly husked.

[0075] In addition, in this embodiment, an example of using the display 21 as the notification unit is described, but in addition to the display 21, or instead of it, a speaker capable of outputting sound can also be provided to notify the operator of the abnormal state of the rice husker 1 using the sound output from the speaker.

[0076] In addition, in this embodiment, if the judgment processing result of step S6 is "No", the processing of steps S9 and step S10 and the re-diagnosis processing of step S3 are executed while continuing to supply rice. However, after executing the judgment processing of step S6, the supply of rice can be temporarily stopped, and the processing of steps S9 and step S10 and the re-diagnosis processing of step S3 can be executed while resuming the supply of rice after the stop.

[0077] In addition, in this embodiment, if the judgment processing result of step S6 is "No", the processing of step S9 is executed immediately, but the processing of step S9 can also be executed after a specified time (for example, set to 5 to 10 seconds) has passed since the judgment processing of step S6 is completed.

[0078] In the present embodiment, the predetermined count value of step S6 is set to 5 times, but it may be set to a number less than 5 times or a number greater than 5 times.

[0079] In addition, in the present embodiment, in step S10, after the gap GA between the first shelling roller 12 and the second shelling roller 13 is switched from the first state (contactable state) to the second state (separated state), the number of times the gap GA is switched from the second state to the first state is counted as the actual count value, but the number of times the judgment process of step S3 is "yes" (the number of times the sliding state of the flat belt 11 is detected) or the number of times the process of step S5 is executed (the number of times the gap GA between the first shelling roller 12 and the second shelling roller 13 is switched from the first state to the second state) may be counted as the actual count value. -Industrial Applicability-

[0080] The invention is suitable for a rice husking machine which uses a flat belt to drive a pair of husking rollers. -Explanation of symbols-

[0081] 1: Rice Husking Machine 8: First driven pulley 9: Second driven pulley 10: Gap adjustment mechanism (gap adjustment unit) 11: Flat belt 12: First shelling roller 13: Second shelling roller 14: Raw material supply department 14d: Feeder coil (vibration imparting section) 15: Supply valve 17: First rotation speed sensor (slip detection unit) 18: Second rotation speed sensor (slip detection unit) 19: Tension pressure sensor (tension detection unit) 20: Control Department 21: Display (Notification Department)

Claims

1. A rice husking machine, comprising: A pair of shelling rollers, whose outer peripheral surfaces are arranged opposite to each other; a gap adjusting part, which can adjust the gap between the pair of shelling rollers; a driving pulley, which is driven to rotate by a driving source; A driven pulley is integrally arranged on each of the pair of shelling rollers; and an annular flat belt is wound around the driving pulley and the driven pulley, and moves around by the rotation of the driving pulley and causes the pair of shelling rollers to rotate in opposite directions and at different circumferential speeds via the driven pulley; characterized in that: The rice husker comprises: a slip detection unit capable of detecting a slip state of the flat belt relative to the driven pulley; and The control unit controls the gap adjustment unit to increase the gap between the pair of hulling rollers when the slip state is detected by the slip detection unit.

2. The rice husker according to claim 1, characterized in that: The control unit controls the gap adjusting unit to reduce the gap after increasing the gap between the pair of shelling rollers.

3. The rice husker according to claim 2, characterized in that: The rice husker also includes: a notification unit, which can notify an operator of an abnormal state; The control unit may cause the notification unit to notify the operator of the abnormal state and stop the rice huller when the number of times the gap between the pair of hulling rollers is reduced after the gap is increased reaches a predetermined number of times.

4. The rice husker according to claim 3, characterized in that: The rice husker further comprises: a tension detection unit, which can detect a tension reduction state of the flat belt; When the slide detection unit detects the slide state and the tension detection unit detects the tension reduction state, the control unit causes the notification unit to notify the operator of the tension reduction state and stops the rice husker.

5. The rice husker according to claim 1, characterized in that: The rice husker comprises: a raw material supplying part which can supply the raw material to the gap between the pair of shelling rollers; and The vibration imparting section can vibrate the raw material supplying section.

6. The rice husker according to claim 5, characterized in that: The rice husker further includes: a valve capable of switching between an open state in which the raw material can be supplied from the raw material supply portion to the gap between the pair of husking rollers, and a closed state in which the raw material cannot be supplied from the raw material supply portion to the gap between the pair of husking rollers; The control unit vibrates the raw material supply unit using the vibration imparting unit and switches the valve to the closed state.

7. The rice husker according to any one of claims 1 to 6, characterized in that: The slip detection unit is a rotation speed sensor capable of detecting the rotation speed of the driven pulley.

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