Rotary drive system and husker provided with the same

Abstract

A rotary drive system is provided. A first endless flat belt (B1) is wound around a first drive pulley (4b), a first tension pulley (6a), a second driven pulley (3B), and a first driven pulley (2A), and the first flat belt (B1) is moved in a loop by a rotational action of the first drive pulley (4b) to rotate a first shelling roller (R1) and a second shelling roller (R2). A first meandering control pulley (8) that is swingable about a swing axis (C3) extending in a thickness direction of a region in contact with the first flat belt (B1) is provided to guide the first flat belt (B1) between the first tension pulley (6a) and the first drive pulley (4b).

Description

Technical Field

[0001] The present invention relates to a rotary drive system for driving a rotary roller to rotate, and a rice huller equipped with such a system. Background Technology

[0002] Conventional rice hullers, such as those disclosed in Patent Document 1, include a rotary drive system comprising a pair of hulling rollers extending parallel to a rotation axis and adjacent to each other in a direction orthogonal to the rotation axis. This rotary drive system has a drive motor that rotates a drive pulley, driven pulleys mounted on each hulling roller and rotating integrally with each hulling roller, and a tension pulley disposed between the drive pulley and the two driven pulleys. A hexagonal belt, V-belt, or similar annular belt is wound around the drive pulley, the two driven pulleys, and the tension pulley. When the drive motor is started and the drive pulley rotates, the annular belts moving around it cause the hulling rollers to rotate in opposite directions, supplying rice to the gap between the two rotating hulling rollers. The rice is squeezed through the gap by the outer circumferential surfaces of the two hulling rollers, thereby shearing the husks and removing them from the rice.

[0003] However, hexagonal belts, V-belts, and other annular belts have the following characteristics: during circular movement, the two sides of the annular belt mainly contact the inner sides of each pulley, and simply changing to pulleys with increased width is insufficient to improve the power transmission capacity between the annular belt and each pulley. Therefore, for example, the rice huller described in Patent Document 1 attempts to increase the output of the drive motor in the rotary drive system and improve the power transmission capacity between the annular belt and each pulley to increase the rotational force of the two hulling rollers in order to improve the hulling capacity. In this case, it is necessary to increase the size of each pulley in the direction of rotation axis and increase the number of annular belts wound on each pulley.

[0004] However, for example, if the pulleys are supported by cantilevered support shafts, increasing the number of annular belts and increasing the size of each pulley in the direction of rotation axis will increase the bending stress applied to the support shaft, which may cause the support shaft to fail due to repeated use. In addition, there is also the problem of increasing the size of each pulley in the direction of rotation axis, resulting in a larger overall size of the device.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent No. 5110299 Summary of the Invention

[0008] -The problem the invention aims to solve-

[0009] To solve the above problems, the inventors conceived of the following: to avoid the possibility of support shaft failure due to the increase in the number of annular belts and to avoid the device becoming too large, the annular belts are replaced with flat belts and the contact area with the outer circumference of each pulley is increased, thereby improving the power transmission capacity between an annular belt and each pulley and shortening the size of each pulley in the direction of rotation axis.

[0010] Furthermore, if the annular belt is replaced with a flat belt, slippage can easily occur between the flat belt and the outer circumferential surfaces of each pulley. This could cause the flat belt to move around at a position offset from the axial direction of each pulley, or to move around while simultaneously serpentine along the axial direction of each pulley. To address this, the inventors conducted trial and error, ultimately conceiving of a suitable rotary drive system by placing pulleys of appropriate structure in appropriate positions.

[0011] The present invention was made in view of the above points, and its object is to provide a rotary drive system that can have high power transmission capability and perform stable rotary drive operation even when the output of the drive motor is increased, and is not prone to failure even with repeated use.

[0012] -Solutions for solving the problem-

[0013] To achieve the above objectives, the present invention is characterized by the use of a flat belt. Furthermore, the present invention is further characterized by a serpentine control pulley disposed in the circumferential movement direction of the flat belt, which is freely oscillating towards the downstream side of the drive belt.

[0014] Specifically, taking the rotary drive system that drives the rotary roller as the object, the following technical solution is adopted.

[0015] That is, in the first aspect of the invention, the rotary drive system is characterized by comprising: a drive pulley driven to rotate by a drive motor; a driven pulley that rotates integrally with the rotary roller; an annular flat belt wound around the drive pulley and the driven pulley, moving around the drive pulley by rotational movement, and rotating the rotary roller via the driven pulley; and a tension pulley capable of adjusting the tension of the flat belt; wherein the pulley downstream of the drive pulley in the direction of the circular movement of the flat belt is an adjacent pulley, and between the adjacent pulley and the drive pulley, a serpentine control pulley that can freely oscillate around a pivot axis extending along the thickness direction of the area in contact with the flat belt guides the flat belt.

[0016] The second aspect of the invention is that, in the first aspect of the invention, the serpentine control pulley is located between the adjacent pulley and the drive pulley, closer to the side of the adjacent pulley than at the center position.

[0017] The third aspect of the invention is that, in the inventions of the first and second aspects, the adjacent pulley is the tension pulley.

[0018] The fourth aspect of the invention is characterized in that, in any one of the first to third aspects, the rotating rollers are provided in pairs, the rotation axes of the pair of rotating rollers extend parallel to each other and are arranged at adjacent positions, the flat belt is sequentially wound around each driven pulley that is integrally rotatably disposed on each of the rotating rollers, such that when the flat belt moves around, the rotating rollers rotate in opposite directions to each other, and the two rotating rollers are configured such that, in the rotating state, granular material supplied to the gap between the two rotating rollers is squeezed through the gap by the outer peripheral surfaces of the two rotating rollers.

[0019] The fifth aspect of the invention is, in accordance with the fourth aspect, characterized in that the rotary drive system comprises a pair of drive motors, a pair of drive pulleys, a pair of flat belts, a pair of tension pulleys, and a pair of serpentine control pulleys; the driven pulleys comprise a pair of first driven pulleys and a pair of second driven pulleys; one first driven pulley and one second driven pulley are disposed on one rotary roller and rotate integrally with the rotary roller; and another first driven pulley and another second driven pulley are disposed on another rotary roller and rotate integrally with the rotary roller; a flat belt is wound around one drive pulley, one serpentine control pulley, one tension pulley, one first driven pulley, and another... A first drive system is formed on one of the second driven pulleys, while another flat belt is wound around another drive pulley, another serpentine control pulley, another tension pulley, another first driven pulley, and one second driven pulley to form a second drive system. A clutch mechanism is provided in the first drive system and the second drive system. The clutch mechanism switches between a state in which one flat belt is disengaged from one of the first driven pulleys and the other flat belt is in contact with another of the first driven pulleys and a state in which one flat belt is in contact with one of the first driven pulleys and the other flat belt is disengaged from another of the first driven pulleys, so as to switch the drive system that drives the two rotating rollers to rotate.

[0020] The sixth aspect of the invention is, in the fifth aspect of the invention, characterized in that the rotary drive system includes a belt travel detection sensor capable of acquiring travel data of each of the flat belts, and a control unit connected to each of the drive motors, the clutch mechanism, and the belt travel detection sensor. The control unit includes a storage unit that pre-stores a threshold for determining that the travel of the flat belt is in a serpentine state, and a determination unit that compares the travel data obtained by the belt travel detection sensor with the threshold to determine whether the flat belt is in a serpentine state. The control unit is configured such that when the determination unit determines that it is in a serpentine state, the clutch mechanism is operated to switch to a different drive system, and the two rotary rollers are driven to rotate by the different drive systems until the determination unit determines that the flat belt is not in a serpentine state in the original drive system.

[0021] The seventh aspect of the invention is a rice huller, characterized in that the rice huller has the rotary drive system described in any one of the fourth to sixth aspects of the invention, the granules are rice, and the rice hulling mechanism is configured to remove the rice husks when the rice is squeezed by the outer peripheral surfaces of the two rotating rollers in a rotating state and passes through the gap between the two rotating rollers.

[0022] -The Effects of the Invention-

[0023] In the first aspect of the invention, a flat belt is applied to the annular belt that rotates the rotating roller. Therefore, when the output of the drive motor is increased to improve the rotational force of the rotating roller, the power transmission capacity between the annular belt and each pulley can be improved by increasing the width of the flat belt without increasing the number of flat belts. Thus, even when each pulley is supported by a cantilevered support shaft, the size of each pulley in the direction of rotation can be reduced, resulting in reduced bending stress on the support shaft, making it less prone to failure even with repeated use, and enabling overall system miniaturization. Furthermore, when the rotary drive system is operating, if the flat belt deviates relative to the outer circumference of each pulley in the direction of rotation of each pulley, the serpentine control pulley applies a resistance force to the guided flat belt in the opposite direction of the deviation and oscillates as the flat belt moves. Therefore, if the flat belt repeatedly performs circumferential movements, the deviation of the flat belt in the direction of rotation of each pulley gradually decreases, and the flat belt returns to a position where stable circumferential movements can be performed, thus stabilizing the rotary drive operation of the system.

[0024] In the second aspect of the invention, the serpentine control pulley is positioned close to the adjacent pulley, thus the resistance exerted on the flat belt by the serpentine control pulley has a significant impact on the flat belt sliding across the outer circumference of the adjacent pulley. Therefore, even in the case of serpentine movement of the flat belt, the circumferential movement of the flat belt easily returns to a stable state (serpentine movement is easily recovered), thereby making the rotational drive of the system more stable.

[0025] In the third aspect of the invention, the serpentine control pulley is located close to the tensioning pulley. Therefore, when the tension of the flat belt is adjusted by the tensioning pulley, the serpentine control pulley has a significant impact on the flat belt sliding across the outer circumference of the tensioning pulley. Thus, even when the tension of the flat belt is adjusted by the tensioning pulley, serpentine movement of the flat belt caused by it can be avoided as much as possible.

[0026] In the fourth aspect of the invention, the flat belt that makes the two rotating rollers rotate simultaneously is not prone to serpentine movement when moving around. Therefore, when the granules are squeezed by the outer circumferential surfaces of the two rotating rollers and pass through the two rotating rollers at the same time, the driving force of the drive motor can be transmitted to each rotating roller without loss.

[0027] In the fifth aspect of the invention, two drive systems can be switched by a clutch mechanism and a pair of rotating rollers can be driven to rotate. Thus, for example, by setting the first driven pulley and the second driven pulley to different diameters, the circumferential speed of each rotating roller can be changed when switching drive systems.

[0028] In the sixth aspect of the invention, the flat belt will not continue to move around in a serpentine state, thus not only stabilizing the rotational drive of the system, but also preventing malfunctions caused by the flat belt serpentine for a long time.

[0029] In the seventh aspect of the invention, rice husks can be effectively cut open, thereby enabling the production of rice hullers with high hulling capacity. Attached Figure Description

[0030] Figure 1 This is a perspective view showing a portion of the internal structure of a rice huller equipped with a rotary drive system according to an embodiment of the present invention.

[0031] Figure 2 From Figure 1 A schematic diagram showing the direction of arrow II.

[0032] Figure 3 Is it after switching the driver system and... Figure 2 The corresponding diagram.

[0033] Figure 4 It is a block diagram showing the relationship between the control unit, vibration sensor, drive motor and clutch mechanism.

[0034] Figure 5 This is a flowchart of the control process during the flat-band serpentine movement. Detailed Implementation

[0035] 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 preferred embodiments is merely illustrative in nature.

[0036] Figure 1This indicates a rice huller 10 assembled with the rotary drive system 1 according to an embodiment of the present invention. The rice huller 10 is in the shape of a generally rectangular plate with thickness, and includes a frame 10a. The frame 10a has an inclined surface 10b extending obliquely downward on its upper side. An inlet 10c for feeding rice (not shown) into the frame 10a is formed on the upper surface of the frame 10a.

[0037] like Figure 2 and Figure 3 As shown, a first shelling roller R1 (rotating roller) is rotatably supported by a first support shaft r1 at a position approximately above one side of the center of the frame 10a. The rotation axis C1 of the first shelling roller R1 extends along the thickness direction of the frame 10a. A second shelling roller R2 (rotating roller) is supported by a second support shaft r2 at a position below the other side of the first shelling roller R1. The rotation axis C2 of the second shelling roller R2 extends parallel to the rotation axis C1.

[0038] The first deshelling roller R1 and the second deshelling roller R2 have the same diameter and are located adjacent to each other.

[0039] A first rotation sensor s1 and a second rotation sensor s2, capable of detecting the rotational speeds of the first shelling roller R1 and the second shelling roller R2 respectively, are provided on the sides of the first shelling roller R1 and the second shelling roller R2.

[0040] In addition, a roller pressure adjusting cylinder S1 is provided above the second shelling roller R2. The roller pressure adjusting cylinder S1 causes the first shelling roller R1 to contact or leave the second shelling roller R2, thereby adjusting the contact pressure between the first shelling roller R1 and the second shelling roller R2.

[0041] Each of the first shelling roller R1 and the second shelling roller R2 is provided with a first driven pulley 2 and a second driven pulley 3 with a diameter smaller than the first driven pulley 2. The first driven pulley 2 and the second driven pulley 3 rotate integrally with the first shelling roller R1 and the second shelling roller R2. The second driven pulley 3 and the first driven pulley 2 are sequentially installed on the first shelling roller R1 from the front end side of the first support shaft r1, while the first driven pulley 2 and the second driven pulley 3 are sequentially installed on the second shelling roller R2 from the front end side of the second support shaft r2.

[0042] It should be noted that, for convenience, the first driven pulley 2 and the second driven pulley 3 installed on the first shelling roller R1 are referred to as the first driven pulley 2A and the second driven pulley 3A, and the first driven pulley 2 and the second driven pulley 3 installed on the second shelling roller R2 are referred to as the first driven pulley 2B and the second driven pulley 3B.

[0043] A first drive motor 4 is arranged above the first dehulling roller R1. The rotating shaft 4a of the first drive motor 4 extends in the same direction as the rotating axis C1. A first drive pulley 4b is installed on the rotating shaft 4a. The first drive pulley 4b is driven to rotate by the first drive motor 4 and rotates integrally with the rotating shaft 4a.

[0044] On the other hand, a second drive motor 5 is provided obliquely above the second deshelling roller R2 on the opposite side of the first deshelling roller R2, and the rotation shaft 5a of the second drive motor 5 extends in the same direction as the rotation axis C2.

[0045] A second drive pulley 5b is mounted on the rotating shaft 5a. The second drive pulley 5b is driven to rotate by the second drive motor 5 and rotates integrally with the rotating shaft 5a. The second drive pulley 5b has the same diameter as the first drive pulley 4b.

[0046] A first tension changing mechanism 6 is provided on the opposite side of the first shelling roller R1 and the second shelling roller R2, which has a first tensioning pulley 6a (adjacent to the pulley). The rotation axis of the first tensioning pulley 6a extends in the same direction as the rotation axis C1.

[0047] The first tension changing mechanism 6 includes a first rotating frame 6b, the front end of which supports a first tensioning pulley 6a, and the base of which is rotatably supported on a frame 10a. A first cylinder 6c is disposed above the first rotating frame 6b, and the first cylinder 6c moves the first rotating frame 6b up and down by extending and retracting the rod 6d.

[0048] A second tension changing mechanism 7 with a second tensioning pulley 7a (adjacent to the pulley) is provided below the second shelling roller R2. The rotation axis of the second tensioning pulley 7a extends in the same direction as the rotation axis C2, and the second tensioning pulley 7a has the same diameter as the first tensioning pulley 6a.

[0049] The second tension changing mechanism 7 includes a second rotating frame 7b, the front end of which supports a second tensioning pulley 7a, and the base of which is rotatably supported on a frame 10a. A second cylinder 7c is provided between the second rotating frame 7b and the second drive motor 5. The second cylinder 7c moves the second rotating frame 7b up and down by extending and retracting the rod 7d.

[0050] A first serpentine control pulley 8 is provided between the first drive pulley 4b and the first tension pulley 6a. The rotation axis of the first serpentine control pulley 8 extends in the same direction as the rotation axis C1. The first serpentine control pulley 8 can swing freely around the swing axis C3 that extends obliquely upward from the first serpentine control pulley 8 toward the side opposite to the first cylinder 6c.

[0051] A first vibration sensor 8a (with a travel detection sensor) is installed on the first serpentine control pulley 8, which is capable of acquiring the vibration data of the first serpentine control pulley 8 (the travel data of the first flat belt B1 described later).

[0052] On the other hand, a second serpentine control pulley 9 is provided between the second drive pulley 5b and the second tension pulley 7a. The rotation axis of the second serpentine control pulley 9 extends in the same direction as the rotation axis C2, and the second serpentine control pulley 9 has the same diameter as the first serpentine control pulley 8.

[0053] The second serpentine control pulley 9 can swing freely around the swing axis C4 extending obliquely downward from the second serpentine control pulley 9 toward the side opposite to the second cylinder 7c.

[0054] A second vibration sensor 9a (with a travel detection sensor) is installed on the second serpentine control pulley 9, which is capable of acquiring the vibration data of the second serpentine control pulley 9 (the travel data of the second flat belt B2 described later).

[0055] A first flat belt B1 in the shape of an annulus is wound around the first drive pulley 4b, the first serpentine control pulley 8, the first tension pulley 6a, the second driven pulley 3B, and the first driven pulley 2A to form a first drive system K1.

[0056] Viewed from the front end of the first support shaft r1 and the second support shaft r2, the first flat belt B1 is wound in an S-shape around the second driven pulley 3B and the first driven pulley 2A. When the rotation of the first drive pulley 4b causes the first flat belt B1 to move around, the first hulling roller R1 and the second hulling roller R2 rotate in opposite directions relative to each other via the second driven pulley 3B and the first driven pulley 2A. It should be noted that, viewed from the front end of the first support shaft r1 and the second support shaft r2, the first flat belt B1 moves counterclockwise around. Thus, in the first drive system K1, the rice grains fed into the gap between the rotating first hulling rollers R1 and R2 through the inlet 10c can be squeezed through the gap by the outer circumferential surfaces of the first hulling rollers R1 and R2, and the rice husks are removed.

[0057] The tensioning state of the first flat belt B1 can be adjusted by moving the first rotating frame 6b up and down.

[0058] In addition, among the first tensioning pulley 6a, the second driven pulley 3B and the first driven pulley 2A, the pulley located downstream of the first driving pulley 4b on the downstream side of the first flat belt B1 in the direction of its circular movement is the first tensioning pulley 6a. The first serpentine control pulley 8 is located between the first tensioning pulley 6a and the first driving pulley 4b at a position closer to the first tensioning pulley 6a than the central position P1. It swings around the swing axis C3 extending along the thickness direction of the area in contact with the first flat belt B1 and guides the first flat belt B1.

[0059] On the other hand, a second flat belt B2 in the shape of an annulus is wound around the second drive pulley 5b, the second serpentine control pulley 9, the second tension pulley 7a, the second driven pulley 3A and the first driven pulley 2B to form a second drive system K2.

[0060] Viewed from the front end of the first support shaft r1 and the second support shaft r2, the second flat belt B2 is wound in an S-shape around the second driven pulley 3A and the first driven pulley 2B. When the rotation of the second drive pulley 5b causes the second flat belt B2 to move around, the first hulling roller R1 and the second hulling roller R2 rotate in opposite directions via the second driven pulley 3A and the first driven pulley 2B. Thus, in the second drive system K2, the rice grains fed into the gap between the rotating first hulling rollers R1 and R2 through the inlet 10c can also be squeezed through the gap by their outer circumference and have their husks removed. It should be noted that, viewed from the front end of the first support shaft r1 and the second support shaft r2, the second flat belt B2 moves clockwise around.

[0061] The tension of the second flat belt B2 can be adjusted by moving the second rotating frame 7b up and down.

[0062] In addition, among the second tensioning pulley 7a, the second driven pulley 3A and the first driven pulley 2B, the pulley located downstream of the second drive pulley 5b on the downstream side of the second flat belt B2 in the direction of its circumferential movement is the second tensioning pulley 7a. The second serpentine control pulley 9 is located between the second tensioning pulley 7a and the second drive pulley 5b at a position closer to the second tensioning pulley 7a than the central position P2. It swings around the swing axis C4 extending along the thickness direction of the area in contact with the second flat belt B2 and guides the second flat belt B2.

[0063] A clutch mechanism 20 is provided in the first drive system K1 and the second drive system K2. The clutch mechanism 20 switches the drive system that drives the first shelling roller R1 and the second shelling roller R2 to rotate.

[0064] The clutch mechanism 20 includes: a first clutch unit 11 disposed between the first deshelling roller R1 and the first driven pulley 2A, and a second clutch unit 12 disposed between the second deshelling roller R2 and the second driven pulley 3B.

[0065] The first clutch unit 11 is configured to rotate around the rotation axis C1. A pair of first clutch pulleys 11a are provided at a predetermined interval along the circumference centered on the rotation axis C1 at a position on the radial outer side of the first shelling roller R1. The first clutch pulleys 11a are able to rotate freely around the rotation axis extending in the same direction as the rotation axis C1.

[0066] On the other hand, the second clutch unit 12 is configured to rotate about the rotation axis C2. A pair of second clutch pulleys 12a are provided at a predetermined interval along the circumference centered on the rotation axis C2 at a position on the radially outer side of the second shelling roller R2. The second clutch pulleys 12a are able to rotate freely about the rotation axis extending in the same direction as the rotation axis C2.

[0067] A first sprocket 13 is mounted on the first clutch unit 11, the center of which coincides with the rotation axis C1. A second sprocket 14 is mounted on the second clutch unit 12, the center of which coincides with the rotation axis C2.

[0068] Below the first sprocket 13, a relay double sprocket 15 is provided with a rotating shaft extending in the same direction as the rotating shaft C1, while on the opposite side of the second sprocket 14 from the first sprocket 13, a third sprocket 16 is provided with a rotating shaft that coincides with the rotating shaft of the second serpentine control pulley 9.

[0069] A third cylinder 17 is provided below the second tension pulley 7a. The third cylinder 17 causes the third sprocket 16 to rotate in both directions by the extension and retraction of the rod 17a.

[0070] A first chain 18 is wound on one of the first sprockets 13 and the intermediate double sprocket 15, and a second chain 19 is wound on the other sprocket of the second sprocket 14 and the intermediate double sprocket 15, and the third sprocket 16.

[0071] Then, when the third sprocket 16 rotates in both directions, the first clutch unit 11 and the second clutch unit 12 rotate 180 degrees in the forward and reverse directions respectively via the first sprocket 13, the second sprocket 14, the intermediate double sprocket 15, the first chain 18, and the second chain 19. The clutch mechanism 20 can then... Figure 2 The state shown and Figure 3 Switching between the shown states, Figure 2The state shown is as follows: each second clutch pulley 12a of the second clutch unit 12 causes the second flat belt B2 to disengage from the first driven pulley 2B, and each first clutch pulley 11a of the first clutch unit 11 causes the first flat belt B1 to contact the first driven pulley 2A; Figure 3 The state shown is as follows: the first clutch pulleys 11a of the first clutch unit 11 disengage the first flat belt B1 from the first driven pulley 2A, and the second clutch pulleys 12a of the second clutch unit 12 engage the second flat belt B2 with the first driven pulley 2B. It should be noted that when the drive system is switched by the clutch mechanism 20, the tension of the first flat belt B1 and the tension of the second flat belt B2 are adjusted by the first tension changing mechanism 6 and the second tension changing mechanism 7, respectively.

[0072] like Figure 4 As shown, a display monitor 40 capable of displaying the status of the rice huller 10 is installed on the frame 10a.

[0073] The first rotation sensor s1, the second rotation sensor s2, the first drive motor 4, the second drive motor 5, the first vibration sensor 8a, the second vibration sensor 9a, the clutch mechanism 20, and the display monitor 40 are connected to the control unit 30.

[0074] The control unit 30 outputs a working signal to the first drive motor 4 to drive the first drive pulley 4b to rotate, thereby driving the first shelling roller R1 and the second shelling roller R2 to rotate in the first drive system K1.

[0075] On the other hand, the control unit 30 outputs a working signal to the second drive motor 5 to drive the second drive pulley 5b to rotate, thereby driving the first shelling roller R1 and the second shelling roller R2 to rotate in the second drive system K2.

[0076] To prevent the first flat belt B1 or the second flat belt B2 from snaking due to sudden drive when starting to drive the first drive motor 4 or the second drive motor 5, the control unit 30 controls the first drive motor 4 or the second drive motor 5 to take a longer time than the set time for normally reaching the target speed. For example, the control unit 30 uses an inverter or the like to reach the target speed in 1 to 5 seconds, preferably about 2 seconds.

[0077] In addition, when the rice huller 10 malfunctions, the control unit 30 outputs a display signal to the display monitor 40 to show the user an error message.

[0078] Additionally, the control unit 30 includes: a storage unit 30a, which pre-stores a threshold T1 for determining whether the movement of the first flat band B1 or the second flat band B2 is in a serpentine state; and a determination unit 30b, which compares the vibration data obtained by the first vibration sensor 8a or the second vibration sensor 9a with the threshold T1 to determine whether the first flat band B1 or the second flat band B2 is in a serpentine state.

[0079] In addition, the storage unit 30a pre-stores a threshold T2, which is used to determine the state of slippage between the first flat belt B1 or the second flat belt B2 and the first driven pulley 2 or the second driven pulley 3.

[0080] Then, the determination unit 30b compares the rotational speed data obtained by the first rotation sensor s1 or the second rotation sensor s2 with the threshold T2 to determine whether the first flat belt B1 or the second flat belt B2 has slipped.

[0081] When the determination unit 30b determines that the first flat belt B1 or the second flat belt B2 is in a serpentine state, the control unit 30 operates the clutch mechanism 20 to switch to a different drive system, and the first deshelling roller R1 and the second deshelling roller R2 are driven to rotate by the different drive system until the determination unit 30b determines that the first flat belt B1 or the second flat belt B2 is not in a serpentine state in the original drive system.

[0082] Next, the operation of the control unit 30 will be explained in detail when the rice huller 10 is driven by the first drive system K1 and the first flat belt B1 is serpentine.

[0083] like Figure 5 As shown, firstly, in step S1, the control unit 30 begins to acquire the travel data (vibration data) of the first flat belt B1 moving around from the first vibration sensor 8a, and then proceeds to step S2.

[0084] In step S2, the determination unit 30b compares the vibration data obtained from the first vibration sensor 8a with the threshold T1 stored in the storage unit 30a to determine whether the first flat band B1 is in a serpentine state.

[0085] When the determination in step S2 is negative (NO), that is, if the determination unit 30b determines that the first flat belt B1 is not in a serpentine state, the first drive system K1 continues to operate the rice huller 10.

[0086] On the other hand, when the determination in step S2 is yes (YES), that is, if the determination unit 30b determines that the first flat belt B1 is in a serpentine state, it enters step S3, outputs a stop signal to the first drive motor 4, and outputs a working signal to the clutch mechanism 20. After switching the rotation drive of the first shelling roller R1 and the second shelling roller R2 to the rotation drive performed by the second drive system K2, it outputs a working signal to the second drive motor 5 and enters step S4.

[0087] In step S4, after resetting the stop count N of the second drive motor 5 to N=0, the process proceeds to step S5.

[0088] In step S5, the control unit 30 begins to acquire travel data (vibration data) of the first flat belt B1 moving around from the first vibration sensor 8a, and proceeds to step S6.

[0089] In step S6, the determination unit 30b compares the vibration data obtained from the first vibration sensor 8a with the threshold T1 stored in the storage unit 30a to determine whether the first flat band B1 is in a serpentine state.

[0090] When the determination in step S6 is negative (NO), that is, if the determination unit 30b determines that the first flat belt B1 is not in a serpentine state, then step S11 is entered, a stop signal is output to the second drive motor 5, and a working signal is output to the clutch mechanism 20. After switching the rotation drive of the first shelling roller R1 and the second shelling roller R2 to the rotation drive performed by the first drive system K1, a working signal is output to the first drive motor 4, and the process returns to step S1.

[0091] On the other hand, when the determination in step S6 is yes (YES), that is, if the determination unit 30b determines that the first flat belt B1 is in a serpentine state, then step S7 is entered, the control unit 30 outputs a stop signal to the second drive motor 5 to temporarily stop the second drive motor 5, and then outputs a working signal to the second drive motor 5 to restart it, and then step S8 is entered.

[0092] In step S8, the stop count N of the second drive motor 5 is incremented by 1, and then the process proceeds to step S9.

[0093] In step S9, the determination unit 30b determines whether the stop count N has reached the predetermined number X times.

[0094] When the determination in step S9 is negative (NO), that is, if the determination unit 30b determines that the stop count N has not reached the number X, then return to step S5 and continue to observe the serpentine state of the first flat band B1.

[0095] On the other hand, when the determination in step S9 is YES, that is, if the determination unit 30b determines that the stop count N has reached the number X, it enters step S10, the control unit 30 outputs a display signal to the display monitor 40 to display an error message, and outputs a stop signal to the second drive motor 5 to stop the rice huller 10.

[0096] It should be noted that when the rice huller 10 is driven by the second drive system K2, the operation of the control unit 30 is the same except that the drive system is reversed. Therefore, detailed description is omitted.

[0097] In summary, according to the embodiments of the present invention, by applying the first flat belt B1 and the second flat belt B2 to the annular belt that rotates the first shelling roller R1 and the second shelling roller R2, when the output of the first drive motor 4 and the second drive motor 5 is increased to improve the rotational force of the first shelling roller R1 and the second shelling roller R2, the power transmission capacity between the first flat belt B1 and the second flat belt B2 and each pulley can be improved by increasing the width of the first flat belt B1 and the second flat belt B2 without increasing the number of the first flat belt B1 and the second flat belt B2. Therefore, even when each pulley is supported by a cantilevered support shaft, the size of each pulley in the direction of rotation axis can be reduced, thus reducing the bending stress applied to the support shaft, making it less prone to failure even with repeated use, and enabling the overall system to be miniaturized.

[0098] Furthermore, when the rotary drive system 1 is operating, if the first flat belt B1 or the second flat belt B2 deviates relative to the outer circumference of each pulley in the direction of the pulley's rotation axis, the first serpentine control pulley 8 or the second serpentine control pulley 9 applies a resistance force to the guided first flat belt B1 or the second flat belt B2 in the opposite direction of the deviation and oscillates as the first flat belt B1 or the second flat belt B2 moves. Therefore, if the first flat belt B1 or the second flat belt B2 repeatedly performs a circumferential movement, the deviation of the first flat belt B1 or the second flat belt B2 in the direction of the pulley's rotation axis gradually decreases, and the first flat belt B1 or the second flat belt B2 returns to a position where a stable circumferential movement can be performed, thus stabilizing the rotary drive operation of the rotary drive system 1.

[0099] Furthermore, in the above structure, the first serpentine control pulley 8 or the second serpentine control pulley 9 is positioned close to the first tension pulley 6a or the second tension pulley 7a. Therefore, the resistance exerted by the first serpentine control pulley 8 or the second serpentine control pulley 9 on the first flat belt B1 or the second flat belt B2 has a significant impact on the first flat belt B1 or the second flat belt B2 sliding over the outer circumference of the first tension pulley 6a or the second tension pulley 7a. Thus, even when the first flat belt B1 or the second flat belt B2 is serpentine, its circumferential movement easily returns to a stable state (serpentine movement is easily recovered), thereby making the rotational drive operation of the rotary drive system 1 more stable.

[0100] Furthermore, as described above, the first serpentine control pulley 8 and the second serpentine control pulley 9 are located near the first tensioning pulley 6a and the second tensioning pulley 7a, respectively. According to this structure, when the tension of the first flat belt B1 or the second flat belt B2 is adjusted by the first tensioning pulley 6a or the second tensioning pulley 7a, the first serpentine control pulley 8 or the second serpentine control pulley 9 has a significant influence on the first flat belt B1 or the second flat belt B2 that slides across the outer circumference of the first tensioning pulley 6a or the second tensioning pulley 7a. Therefore, even when the tension of the first flat belt B1 or the second flat belt B2 is adjusted by the first tensioning pulley 6a or the second tensioning pulley 7a, serpentine movement of the first flat belt B1 or the second flat belt B2 caused by this adjustment can be avoided as much as possible.

[0101] In addition, the first flat belt B1 or the second flat belt B2, which rotates the first hulling roller R1 and the second hulling roller R2 simultaneously, is not prone to serpentine movement when moving around. Therefore, when the rice is squeezed by the outer circumferential surfaces of the first hulling roller R1 and the second hulling roller R2 and passes through the first hulling roller R1 and the second hulling roller R2, the driving force of the first drive motor 4 or the second drive motor 5 can be transmitted to the first hulling roller R1 and the second hulling roller R2 without loss.

[0102] In addition, the clutch mechanism 20 can switch the first drive system K1 and the second drive system K2 and drive the first shelling roller R1 and the second shelling roller R2 to rotate. Therefore, for example, by setting the first driven pulley 2 and the second driven pulley 3 to different diameters, the circumferential speed of the first shelling roller R1 and the second shelling roller R2 can be changed when switching drive systems.

[0103] In addition, the control unit 30 determines whether the first flat belt B1 or the second flat belt B2 is in a serpentine state and switches the drive system. Therefore, the first flat belt B1 or the second flat belt B2 will not continue to move around in a serpentine state. This not only stabilizes the rotation drive operation of the rotation drive system 1, but also prevents malfunctions caused by the first flat belt B1 or the second flat belt B2 continuously serpentine for a long time.

[0104] Therefore, the rice huller 10 of the present invention has a high hulling capacity and can effectively cut and remove rice husks.

[0105] It should be noted that in the embodiments of the present invention, among the first driven pulley 2A, the second driven pulley 3B, and the first tension pulley 6a, the adjacent pulley located downstream of the first drive pulley 4b on the downstream side of the first flat belt B1 in the circumferential movement direction is the first tension pulley 6a. The first serpentine control pulley 8 is disposed between the first tension pulley 6a and the first drive pulley 4b. However, when the adjacent pulley is the first driven pulley 2A or the second driven pulley 3B, serpentine movement can be controlled even if the first serpentine control pulley 8 is disposed between these pulleys and the first drive pulley 4b.

[0106] Furthermore, in an embodiment of the present invention, among the first driven pulley 2B, the second driven pulley 3A, and the second tension pulley 7a, the adjacent pulley located downstream of the second drive pulley 5b on the downstream side of the second flat belt B2 in the circumferential movement direction is the second tension pulley 7a. The second serpentine control pulley 9 is disposed between the second tension pulley 7a and the second drive pulley 5b. However, when the adjacent pulley is the first driven pulley 2B or the second driven pulley 3A, serpentine movement can be controlled even if the second serpentine control pulley 9 is disposed between these pulleys and the second drive pulley 5b.

[0107] In addition, in the embodiments of the present invention, the first vibration sensor 8a or the second vibration sensor 9a is used to detect the serpentine state of the first flat band B1 or the second flat band B2. However, as long as the serpentine state of the first flat band B1 or the second flat band B2 can be detected, other sensors can also be used for detection. For example, optical sensors, temperature sensors, etc. can be used to detect the serpentine state of the first flat band B1 or the second flat band B2.

[0108] In addition, in the embodiments of the present invention, the first vibration sensor 8a and the second vibration sensor 9a are mounted on the first serpentine control pulley 8 and the second serpentine control pulley 9, but vibration can also be detected by mounting them on other pulleys to detect the serpentine state of the first flat belt B1 or the second flat belt B2.

[0109] In addition, in the embodiments of the present invention, the first rotation sensor s1 and the second rotation sensor s2 are respectively disposed on the side of the first shelling roller R1 and the second shelling roller R2, but are not limited thereto. As long as the rotation speed of the first shelling roller R1 and the second shelling roller R2 can be detected, they can also be installed in other positions.

[0110] In addition, in an embodiment of the present invention, the determination unit 30b compares the rotational speed data obtained by the first rotation sensor s1 or the second rotation sensor s2 with a preset threshold T2 to determine whether the first flat belt B1 or the second flat belt B2 has slipped. However, for example, the determination unit 30b may also calculate the difference between the rotational speed data obtained by the first rotation sensor s1 and the rotational speed data obtained by the second rotation sensor s2, i.e., the rotational speed difference data, and compare the rotational speed difference data with the preset threshold to determine whether the first flat belt B1 or the second flat belt B2 has slipped.

[0111] Furthermore, in the embodiments of the present invention, the case of “switching control of the drive system” when any flat band snakes is described. However, the present invention is not limited to this structure, and other methods can be used as needed to suppress the snake state of the flat band.

[0112] As a method to suppress the serpentine state of the flat band, the following structure can be adopted, for example: without switching the drive system, the speed of the currently driven drive system is reduced, and after confirming that the serpentine state is restored in the decelerated state, the speed is accelerated again (hereinafter referred to as "drive system deceleration control"). Alternatively, the following structure can also be adopted, for example: without switching the drive system, the currently driven drive system is stopped, the same drive system is restarted, and the drive is continued only after confirming that the serpentine state is restored (hereinafter referred to as "drive system stop control").

[0113] Furthermore, the present invention can appropriately combine the above three controls. For example, if "drive system deceleration control" is implemented and the system fails to recover after a specified time of serpentine movement, "drive system stop control" can be implemented; if "drive system stop control" is implemented and the system fails to recover after a specified time of serpentine movement, "drive system switching control" can be implemented. Moreover, the following structure can also be adopted: utilizing machine learning or the like, any one of "drive system deceleration control," "drive system stop control," and "drive system switching control" can be implemented as needed.

[0114] It should be noted that the rotary drive system 1 of the embodiments of the present invention is applicable to the rice huller 10, but it can also be applied to other devices, such as roller mills.

[0115] -Industry availability-

[0116] This invention is applicable, for example, to rotary drive systems that drive rotary rollers to rotate and to rice hullers equipped with such systems.

[0117] -Symbol Explanation-

[0118] 1: Rotary drive system

[0119] 2: First driven pulley

[0120] 3: Second driven pulley

[0121] 4: First drive motor

[0122] 4b: First drive pulley

[0123] 5: Second drive motor

[0124] 5b: Second drive pulley

[0125] 6a: First tensioning pulley

[0126] 7a: Second tension pulley

[0127] 8: First serpentine control pulley

[0128] 9: Second serpentine control pulley

[0129] 10: Rice Huller

[0130] 20: Clutch mechanism

[0131] 30: Control Department

[0132] 30a: Storage Department

[0133] 30b: Judgment Department

[0134] B1: First Flat Zone

[0135] B2: Second Flat Zone

[0136] K1: First Drive System

[0137] K2: Second Drive System

[0138] R1: First shelling roller (rotating roller)

[0139] R2: Second shelling roller (rotating roller)

[0140] 8a: First vibration sensor (with travel detection sensor)

[0141] 9a: Second vibration sensor (with travel detection sensor)

[0142] T1: Threshold

Claims

1. A rotary drive system, characterized in that, The rotary drive system includes: The drive pulley is rotated by a drive motor. The driven pulley rotates integrally with the rotating roller; A ring-shaped flat belt is wound around the drive pulley and the driven pulley, and moves around it by the rotational motion of the drive pulley, causing the rotating roller to rotate via the driven pulley; and The tension pulley can adjust the tension of the flat belt; Of the driven pulley and the tension pulley, the pulley located downstream of the drive pulley on the downstream side of the circular movement direction of the flat belt is the adjacent pulley. Between the adjacent pulley and the drive pulley, a serpentine control pulley that can swing freely around a swing axis extending along the thickness direction of the area in contact with the flat belt and is independent of the tension pulley guides the flat belt.

2. The rotary drive system according to claim 1, characterized in that, The serpentine control pulley is located between the adjacent pulley and the drive pulley, closer to the side of the adjacent pulley than the central position.

3. The rotary drive system according to claim 1 or 2, characterized in that, The adjacent pulley is the tension pulley.

4. The rotary drive system according to claim 1, characterized in that, The rotating rollers are provided in pairs, with their rotation axes extending parallel to each other and positioned adjacent to each other. The flat belt is sequentially wound around each driven pulley, which is integrally and rotatably disposed on each of the rotating rollers, such that the rotating rollers rotate in opposite directions during the circular movement. The two rotating rollers are configured such that, while rotating, granules supplied to the gap between the two rotating rollers are squeezed through the gap by the outer peripheral surfaces of the two rotating rollers.

5. The rotary drive system according to claim 4, characterized in that, The rotary drive system includes a pair of drive motors, a pair of drive pulleys, a pair of flat belts, a pair of tension pulleys, and a pair of serpentine control pulleys. The driven pulley includes a pair of first driven pulleys and a pair of second driven pulleys. One first driven pulley and one second driven pulley are mounted on one of the rotating rollers and rotate integrally with the rotating roller, while another first driven pulley and another second driven pulley are mounted on another rotating roller and rotate integrally with the rotating roller. A flat belt is wound around a drive pulley, a serpentine control pulley, a tension pulley, a first driven pulley, and a second driven pulley to form a first drive system, while another flat belt is wound around another drive pulley, another serpentine control pulley, another tension pulley, another first driven pulley, and a second driven pulley to form a second drive system. A clutch mechanism is provided in the first drive system and the second drive system. The clutch mechanism switches between a state in which one of the flat belts disengages from one of the first driven pulleys and another of the flat belts contacts another of the first driven pulleys and a state in which one of the flat belts contacts one of the first driven pulleys and another of the flat belts disengages from another of the first driven pulleys, so as to switch the drive system that drives the two rotating rollers to rotate.

6. The rotary drive system according to claim 5, characterized in that, The rotary drive system includes: A travel detection sensor capable of acquiring travel data for each of the aforementioned flat bands, and The control unit is connected to each of the drive motors, the clutch mechanism, and the travel detection sensor. The control unit includes: A storage unit pre-stores a threshold for determining whether the movement of the flat band is in a serpentine state, and A determination unit that compares the travel data obtained by the travel detection sensor with the threshold to determine whether the flat band is in a serpentine state. The control unit is configured such that when the determination unit determines that the vehicle is in a serpentine state, the clutch mechanism is operated to switch to a different drive system, and the two rotating rollers are driven to rotate by the different drive systems until the determination unit determines that the flat belt is not in a serpentine state in the original drive system.

7. A rice huller, characterized in that, The rice huller comprises the rotary drive system as described in any one of claims 4 to 6. The granules are rice grains. The rice hulling mechanism removes the rice husks as the rice grains are squeezed through the gap between the two rotating rollers while being squeezed by the outer circumferential surfaces of the two rotating rollers.

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