JPH0631873U - Grain sorter - Google Patents

Abstract

(57) [Summary] [Purpose] In one sorting operation, grain-sorted grains and grain-sized grains above and below are sorted. [Structure] The size of the mesh of the cylindrical rotary sorting net (8) for introducing the grains to be sorted is made different between the upper part and the lower part.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grain selection device for performing rough selection before hulling work or rice selection after hulling work.

[0002]

[Prior art]

 Heretofore, for example, a cylindrical rotary sorting net of a vertical type coarse sorter has been used having meshes of the same size from top to bottom.

[0003]

[Problems to be solved by the device]

 Therefore, since there is only a function of sorting into large and small types, one that passes through the mesh of the sorting net and one that does not pass through the mesh of the sorting net. It is necessary to carry out the roughing work twice, such as removing foreign matter such as rice bran that is larger than the paddy in the rough selection.

[0004]

[Means for Solving the Problems]

 Therefore, according to the present invention, a cylindrical rotating sorting net for introducing the grains to be sorted is formed by connecting the upper sorting net and the lower sorting net having different mesh sizes in series, and the mesh of the upper sorting net is formed. Small, the mesh of the lower sorting net is large, passing through the mesh of the upper sorting net, passing through the mesh of the upper sorting net without passing through the mesh of the upper sorting net, and passing through the mesh of the upper and lower sorting nets. It is configured so that it can be selected into those that are not selected, and it is possible to take out the sized grain from the grain to be sorted in one sorting operation and significantly improve the sorting work efficiency such as rough selection and rice selection. .

In addition, by providing an intake / exhaust dust fan that connects the upper part of the sorting chamber that houses the sorting net and the mesh of the lower sorting net to the extraction path, the dust generated in the sorting chamber It can be prevented from being discharged to the whole body and deteriorating the working environment, and dust can be mixed in the selected ones, and the grain-sized grains below the grain-sized grains can be changed to those below the grain-sized grains. It is possible to prevent mixing of extremely small grains.

[0006] Further, by providing a grain-adjusted grain drop resistance surface at the lower opening edge of the sorting net, it is possible to prevent grain-mixed grains from mixing into grain-sized grains or more, and eliminate grain-grain loss. I will get it.

[0007] Furthermore, a small disc that supports the engaging shaft on the revolving shaft of the sorting net, and one end side of which is rotatably supported by the small disc, and the other end of which can rotate the spinning shaft of the sorting net. The sorting net including a centrifugal link axially supported on the rotary shaft, an elastic small wheel that axially supports the rotary shaft, and a fixing ring that circumscribes the small wheel around the circumference of the revolution shaft. With the planetary motion mechanism, it is possible to easily reduce noise and cost as compared with the gear type planetary motion mechanism, and it is possible to simplify maintenance because lubrication is unnecessary.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a vertical section of the entire vertical roughing machine, which is equipped with a rectangular tubular machine frame (1), and a bottom plate (2) is stretched at a position lifted a predetermined height from the lower end of the machine frame (1). The grain hopper (3) is fitted and attached to the upper opening of the machine frame (1).

The bottom plate (2) is provided with a main shaft (4) rotatably bearing the lower end at the center, and the upper part of the main shaft (4) is located at the center of the circular discharge port (5) of the hopper (3). 3) The upper end of the main shaft (4) is rotatably supported by the bearing member (6) fixed inside the hopper (3) so that the main shaft (4) runs vertically in the center of the sorting chamber (7). ) Is formed between the bottom plate (2) and the hopper (3).

The sorting chamber (7) is provided with a cylindrical rotary sorting net (8) installed in a vertical posture, and four sorting nets (8) are provided at equal intervals around the main shaft (4). There is.

As shown in FIGS. 1 and 2, a circular hole (9) into which the tip of the discharge port (5) is projected is formed in the center of the upper surface, and a circular grain for each sorting net (8) is formed on the outer surface of the lower surface. A grain distribution board (11) having a hollow structure provided with a grain inlet (10) is provided, and a circular hole (9) is opened in the central portion. A circular lid plate (12) and each inlet (10) are provided on the outer side. With the circular bottom plate (13) to be opened, the distribution plate (11) is formed in a hollow structure, and the main shaft (4) pivotally supports the distribution plate (11) through the bottom plate (13) so as to be integrally rotatable. The upper support shaft (14) for each sorting net (8) is provided on the distribution board (11), and the upper end of each upper support shaft (14) is rotatably supported by the cover plate (12). The lower ends of the upper support shafts (14) project downward from the center of the inlet (10) to the bottom plate (13), and the upper ends of the sorting nets (8) are rotatably attached to the upper support shafts (14). I support you.

As shown in FIGS. 1 and 5, a circular gear base (15) is provided on the upper surface of the bottom plate (2) so as to be integrally rotatable with the main shaft (4), and each sorting net (8) is provided. The middle part of each lower support shaft (16) is rotatably supported by the gear base (15), and the lower end of each sorting net (8) is rotatably supported on the upper end of each lower support shaft (16). ing.

As shown in FIGS. 1 and 6, a planetary motion mechanism (17) is installed between the bottom plate (2) and the gear base (15), and is integrally fixed to the gear base (15) and the bottom plate (2). The sun gear (19) integrally fixed to the bearing member (18) at the lower end of the main shaft (4) and the planetary gear (integrally fixed to the lower end of the lower support shaft (16) protruding to the lower surface side of the gear base (15). 20) and an idle gear (22) that rotatably supports the planetary gear (20) on the lower surface of the gear base (15) via a shaft (21) and meshes each planetary gear (20) with a sun gear (19). When the upper and lower support shafts (14) and (16) around the main shaft (4) are revolved, each gear (19) is provided in the mechanism (17) in the direction opposite to the clockwise revolution direction (counterclockwise direction). (22) Rotate each lower support shaft (16) via (20), It is configured such that planetary movements in which the revolution direction and the rotation direction are opposite to each other are performed on each sorting network (8).

As shown in FIGS. 1 and 9, each of the sorting nets (8) has a cylindrical upper sorting net (8a) and a lower sorting net (8b) having different mesh sizes and an intermediate flange (23) and It is formed by connecting in series through a retaining ring (24), and the size (height width) (L1) of the oval mesh (25) of the upper sorting net (8a) is set to the lower sorting net (8b). The size (height width) (L2) of the oval mesh (26) of is smaller (L1> L2), and when the paddy drops in each rotating (revolving and rotating) sorting net (8), The upper screening net (8a) is separated and removed on the outer peripheral side of rice bran smaller than the paddy rice, and the lower screening net (8b) is separated and removed on the outer peripheral side of the rice bran, and foreign matter such as rice bran larger than the paddy rice is separated into the lower screening net (8b). ) It is configured to discharge downward.

Further, a bearing portion (28) of the upper support shaft (14) is formed on an upper flange (25) fitted and fixed to an upper end opening of the upper sorting net (8a), and the lower sorting net (8a) is formed. ) Is formed with a bearing portion (28) of the lower support shaft (16) on the lower flange (29) fitted and fixed to the lower end opening of the lower sorting net (8a), and the lower flange (29) is smaller than the inner diameter (A) of the lower sorting net (8a). The inner diameter (B) of the lower flange (29) is made sufficiently small, and the upper end surface of the lower flange (29) is tapered to form a grain drop resistance surface (30) at the lower opening edge of the lower sorting net (8a). ing .

As shown in FIGS. 1 and 3, each of the sorting nets (8) is pierced through a circular hole (40) so as to be integrally rotatable with the main shaft (4) at a connecting portion of the sorting net (8). Of the circular grate receiving plate (41) to be supported and the circular gutter (42) which is integrally fixed inside the machine frame (1) and is supported on the outer peripheral side of the receiving plate (41), With a hopper-shaped puddle gutter (43) for a corner, which is integrally fixed inside the machine frame (1), an upper sorting chamber (7a) in which the above sorting chamber (7) is equipped with an upper sorting net (8a) And the lower sorting chamber (7b) that houses the lower sorting net (8b), and two squeezing blades (44) that circulate inside the gutter (42) on the receiving plate (41) are opposed to each other. The chute (45), which is a pour outlet, is integrally connected to the part of the gutter (42) that is in contact with the rear face of the machine frame (1). (45) The tip is projected to the back side of the machine frame (1), and the gutter (42) is opened to the base end of the chute (45) through the pour port (46).

As shown in FIGS. 1 and 4, the lower flange (29) of each of the sorting nets (8) is passed through a circular hole (47) so that the main shaft ( 4) A circular paddy trough receiving plate (48) that is supported so as to be integrally rotatable with it, and a circular paddy trough receiving gutter that is integrally fixed inside the machine frame (1) and is supported on the outer peripheral side of the receiving plate (48). (49) and a hopper type paddy trough (50) for corners that is integrally fixed to the inside of the machine frame (1) at the upper part of the gutter (49), and the lower sorting chamber (7b) is a lower sorting net. (8b) is separated from the foreign matter extraction space (7c) below, and two paddy roots (51), which are circulated inside the gutter (49) by the backing plate (48), are fixed at opposite positions. It is equipped with a grain elevator conveyor (53) which is integrally fixed to the paddy tank (52) on the upper end side, and the conveyor (53) is provided on the right outside of the front of the machine casing (1). It is fixed upright, a square notch (54) is provided at the front right corner of the bottom plate (2), and the hopper (55) of the conveyor (53) is projected below the notch (54) and the notch is also cut out. (54) On the bottom surface of the upper gutter (49), a grain trimming opening (56) is opened, and a chute (57) is stretched between the falling opening (56) and the hopper (55).

As shown in FIG. 1, the upper end of the conveyor (53) is connected to the upper part of the rear side of the tank (52) through a chute (58) and the bottom of the front side of the tank (52) is trimmed. An unhulled rice discharge chute (59), which is an outlet, is integrally fixed, and several grain shedding boards (60) are provided inside the tank (52).

As shown in FIG. 1 and FIG. 5, a circular bottom plate (62) of a foreign matter extraction space (7 c) forming a foreign matter receiving trough (61) is provided on the outer periphery, and the bottom plate (62) is attached to the machine casing (1). It is interposed between the bottom plate (2) and the planetary motion mechanism (17), the bottom plate (62) is integrally fixed to the bearing member (18), and the foreign matter gutter (61) is provided on the outer peripheral side of the gear base (15). ) Is supported, and the outer peripheral side of the gutter (61) is integrally connected to the bottom of the paddy gutter (49) via the circular frame (63), and the inner side of the gutter (61) is attached to the gear base (15). Two foreign matter scraping roots (64) to be circulated by are fixed at opposite positions, and a partition wall (65) is provided between the bottom plate (2) and the hopper (3) at the rear right corner of the machine casing (1). A conveyor storage space (66) that separates from the sorting chamber (7) is formed through the container, and a grain elevator (67) is erected in the storage space (66). A triangular notch (68) is provided in the bottom plate (2) for fixing and opening the accommodation space (66) below the bottom plate (2), and the lower portion of the conveyor (67) is projected below the bottom plate (2) to accommodate the accommodation space. (66) A chute (71) is provided between the foreign matter outlet (69) provided on the bottom surface of the gutter (61) and the hopper (70) of the conveyor (67) so that the foreign matter outlet is provided at the upper end of the conveyor (67). A foreign matter discharge chute (72) is fixed, and the tip of the chute (72) is projected to the right side of the machine casing (1).

As shown in FIG. 1, FIG. 2, FIG. 4, and FIG. 10, a vertical paddy rice reducing chute (73) is integrally fixed to the left side of the conveyor (53) outside the front of the machine casing (1), The upper end of the chute (73) is communicatively connected to the bottom surface of the tank (52), and the lower end of the chute (73) is projected into the lower sorting chamber (7b).

As shown in FIG. 1, FIG. 2, FIG. 8 and FIG. 10, the intake / exhaust dust fan (74) is provided inside the machine casing (1) below the bottom plate (2), and the exhaust port of the fan (74) is provided. Facing the outside of the machine, a suction passage (76) is formed at the front left corner of the machine frame (1) to partition the sorting chamber (7) through a partition (75), and the lower end of the passage (76) is connected to the fan. (74) The duct is connected to the suction port (77) on the lower surface through the duct (78), and the upper end of the passage (76) is opened in the upper sorting chamber (7a) at a position higher than the sorting net (8). Further, a suction window (79) for opening the upper sorting chamber (7a) to the outside of the machine is opened in the upper part of the front side of the machine frame (1), and the window (79) is connected to the tank (52) and the chute through the duct (80). The duct (80) is provided with a wind force control valve (81) while being connected to and connected to the connection portion with (73), and the tank ( The upper surface of 52) is provided with a sludge part (82) for taking in outside air.

As shown in FIGS. 1 and 7, a sorting motor (83) is provided on the right side of the lower end of the machine casing (1), and a motor shaft (84) and an intermediate shaft (85) are provided below the bottom plate (2). The conveyor shafts (86) (87) are interlockingly connected with each other via pulleys (88) (89) (90) (91), tension pulleys (92) and belts (93), and the intermediate shafts (85 ), The fan shaft (94) and the main shaft (4) are interlockingly connected via pulleys (95) (96) (97), a tension pulley (98) and a belt (99).

In addition, the hopper (3) can be exchanged according to the type of the sorting net (8) to be sorted, and maintenance such as cleaning of the sorting chamber (7) and lubrication of the planetary motion mechanism (17) can be performed. With respect to the frame (1), the distribution board (11), each receiving plate (41) (48), and the gear base (15) are with respect to the main shaft (4), and each sorting net (8) is with the upper and lower support shafts (14). ) (16) is detachably attached and supported.

The present embodiment is configured as described above, and removes unnecessary substances such as rice gruel and foreign matter before the hulling work. The rough rice containing the rice gruel and foreign matter is put into the hopper (3), and the sorting motor is used. (83) is actuated to drive each conveyor (53) (67) and fan (74), and each sorting net (8) is caused to make a planetary motion in the sorting chamber (7) to start the rough selection work.

When the rough paddy of the hopper (3) enters the distribution board (11) through the discharge port (5), it is sent to the outside by the rotating centrifugal force and is substantially evenly distributed through the respective input ports (10) in the respective sorting nets (8). ).

The coarse grain that has fallen into each sorting net (8) clings to the inner peripheral surface of each sorting net (8) due to the revolution and rotation of each sorting net (8), and dust and grime are the upper sorting net. The chaff and foreign matter that have passed through the mesh (25) of (8a) and are separated and removed to the outer peripheral side of the upper screening net (8a) and do not pass through the mesh (25) of the upper screening net (8a) are in the lower screening net (8b). ), The chaff passes through the mesh (26) of the lower sorting net (8b), is separated and removed to the outer side of the lower sorting net (8b), and does not pass through the mesh (26) of the lower sorting net (8b). Foreign matter such as rice bran is discharged downward from the lower end opening of the lower sorting net (8b).

Most of the rice cake separated and removed on the outer peripheral side of the upper screening net (8a) scatters on the outer side of the upper screening chamber (7a) due to the revolution of the screening net (8), and the hopper-shaped rice gruel ( 43) via the grate receiving trough (42), and the grit falling on the grate receiving plate (41) is also sent to the outside by this rotational centrifugal force and dropped into the grate receiving trough (42). The rice cake that has fallen into the rice porcelain trough (42) is sent in the revolving direction by the raking blade (44) that circulates in this, and is discharged to the outside of the machine through the chute (45) from the outlet (46). .

Most of the chaff separated and removed on the outer peripheral side of the lower sorting net (8b) scatters on the outer side of the lower sorting chamber (7b) due to the revolution of the sorting net (8), and a hopper type rice hull receiver for the corners. The paddy dropped to the paddy trough (49) through the gutter (50) and also the paddy dropped on the paddy paddle (48) is also sent to the outside by this rotating centrifugal force, and the paddy paddle (49). Be dropped by. The paddy felled on the paddy receiving trough (49) is sent in the revolving direction by the raking blade (51) circulating inside the paddy gutter (49), and is passed from the drop opening (56) through the chute (57) to the conveyor (53). It is sent to the hopper (55), fried to the upper tank (52) by the conveyor (57), and discharged from the chute (59) of the tank (52) to the outside of the machine. Further, when a certain amount of paddy is stored in the tank (52) due to a difference in processing capacity from the paddy huller, the paddy is returned to the lower sorting chamber (7b) again through the chute (73). The tank (52) is circulated between the tank (52) and the lower sorting chamber (7b) until the rice grain in the tank (52) is below a predetermined level.

The foreign matter discharged downward from the lower end opening of the lower sorting net (8b) is transferred to the gear base (7c) in the foreign matter extraction space (7c) through the lower flange (29) penetrating the grain conditioning receiving plate (48). 15) It is dropped onto the outside and is sent to the outside by the centrifugal force of the rotation, and dropped into the foreign matter receiving trough (61). The foreign matter that has fallen into the foreign matter receiving trough (61) is sent in the revolving direction by the scraping blades (64) that circulate inside the foreign matter receiving trough (61), and passes through the chute (71) from the outlet (69) to the hopper () of the conveyor (67). 70), is fried by the conveyor (67), and discharged from the shoot (72) to the outside of the machine.

As described above, the roughing operation, the rice porridge and the foreign matter are selected by one rough selection operation.

Further, the suction / exhaust dust fan (74) generates an air flow that flows backward through the paths for picking up rice gruel, paddy, and foreign matter, and removes all the dust generated in each part at the port for picking rice gruel, grain, and foreign matter. It is possible to prevent the shoots (45) (59) (72) from standing up on the entire machine body, as well as to remove dust from rice bran, paddy, and foreign matter. The function and the wind separation effect which reduce the loss of paddy that is discharged when the paddy is mixed with the foreign matter are obtained.

Further, the drop resistance surface (30) formed at the lower opening edge of the lower sorting net (8b) catches the chaff that drops downward, and falls from the lower sorting net (8b). Since it is prevented, the paddy loss is further reduced together with the wind separation effect. Further, the chaff caught on the drop resistance surface (30) forms a constant layer (100) that squeezes the lower end opening of the lower sorting net (8b) into a funnel shape by the revolution and rotation of each sorting net (8). To do. As a result, it is possible to prevent falling from the lower sorting net (8b) due to irregular reflection of paddy caused by low-flow sorting.

Therefore, very high sorting accuracy can be obtained.

FIGS. 11 and 12 show a modified example of the planetary motion mechanism (17) of the screening net (8), wherein the planetary motion mechanism (101) is a main shaft (orbital axis) of the screening net (8). 4) A small disc (102) which is rotatably supported on the small disc (102), and one end side of the small disc (102) which is rotatably supported through a shaft (103) at equal intervals and the other end. The four centrifugal links (104) that rotatably support the lower support shaft (16), which is the rotation shaft of each sorting net (8), and the single pivotal support on the lower support shaft (16). Rubber wheel (105) and a fixed ring (106) circumscribing each wheel (105) on the circumference centered on the main shaft (4). (104) The planetary motion mechanism (101) is configured so that the base end is in the rear position.

When the small disc (102) rotates (revolves), each wheel (105) is pressed against the circumferential surface of the fixing ring (106) by the centrifugal link (104) and moves along the fixing ring (106). Move (revolution) and rotate (rotate). As a result, each sorting network (8) makes a planetary motion as in the above-mentioned embodiment.

As described above, in the planetary motion mechanism (101) having the gearless structure, first, noise and vibration are significantly reduced, the number of parts is reduced, and the cost can be easily reduced. Maintenance is easy without the need for.

When the planetary motion mechanism (101) is incorporated, a circular foreign matter receiving plate (107) is integrally fixed to the boss (102a) of the small disc (102), and the receiving plate (107) is fixed. By opening the lower flange (29) of the lower sorting net (8b) on the upper surface and providing the foreign matter sweeping blade (64) on the receiving plate (107), the foreign matter is taken out in the same manner as in the above-mentioned embodiment. .

Further, the fixing ring (106) can also serve as the side wall on the inner peripheral side of the gutter (61) without special provision.

In the figure, (108) is a hole opened in the foreign material receiving plate (107) for rotatably penetrating each lower support shaft (16).

[0040]

[Effect of device]

 As is apparent from the above-described embodiments, the present invention provides a cylindrical rotary sorting net (8) for introducing grains to be sorted into an upper sorting net (8a) and a lower sorting net (8b) having different mesh sizes. Are connected in series, the mesh (25) of the upper selection net (8a) is small, the mesh (26) of the lower selection net (8b) is large, and the mesh (25) of the upper selection net (8a) is large. ), Those which do not pass the mesh (25) of the upper sorting net (8a) but pass the mesh (26) of the lower sorting net (8b), and those of the upper and lower sorting nets (8a) (8b). It is configured to sort into those that do not pass through the mesh (25) (26), and the grain can be extracted from the grain to be sorted in one sorting operation, such as rough selection and rice selection. It is possible to significantly improve the sorting work efficiency.

In addition, an intake / exhaust dust fan (74) communicating with the upper part of the sorting chamber (7) containing the sorting net (8) and the mesh (26) of the lower sorting net (8b) in the extraction route. By installing it, it is possible to prevent the dust generated in the sorting chamber (7) from being discharged to the outside of the machine from each outlet such as the chute (45) (59) (72) and deteriorating the working environment. It is also possible to prevent dust from mixing in the sorted ones, and preventing mixed granules smaller than the adjusted granules from mixing extremely small grains into the granulated granules below the adjusted granule. It is possible to make a good selection.

Further, by providing the grain-adjusted grain drop resistance surface (30) on the lower end opening edge of the sorting net (8), it is possible to prevent the grain-sized grains from mixing with the grain-sized grains or more. It can eliminate grain loss.

Further, a small disc (102) that supports the engaging shaft on the revolution shaft (4) of the sorting net (8), and one end side of which is rotatably supported by the small disc (102). A centrifugal link (104) that rotatably supports the rotation shaft (16) of the sorting net (8) at the other end, and an elastic small wheel (105) that supports the engagement shaft on the rotation shaft (16). ) And a fixed ring (106) circumscribing the small wheel (102) on the circumference centered on the revolution axis (4), the planetary movement mechanism (101) of the sorting net (8). As a result, it is possible to easily reduce noise and cost compared to a gear type planetary motion mechanism, and at the same time, lubrication is unnecessary and maintenance can be simplified.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of the entire roughing machine.

FIG. 2 is an explanatory plan view of a grain charging unit for a rotary sorting net.

FIG. 3 is an explanatory plan view of a rice porridge extraction unit.

FIG. 4 is an explanatory plan view of a grain removing unit.

FIG. 5 is an explanatory plan view of a foreign matter take-out portion.

FIG. 6 is an explanatory plan view of a planetary movement mechanism section.

FIG. 7 is an explanatory plan view of a power transmission unit.

FIG. 8 is an explanatory plan view of a suction / exhaust fan unit.

FIG. 9 is an explanatory vertical cross-sectional view of the entire rotary selection net.

FIG. 10 is a sectional front view of a grain tank unit.

FIG. 11 is an explanatory longitudinal sectional view showing a modified example of the planetary movement mechanism.

FIG. 12 is an explanatory plan view showing a modified example of the planetary motion mechanism.

[Explanation of symbols]

 (4) Spindle (revolution shaft) (7) Sorting chamber (8) Rotating sorting net (8a) Upper sorting net (8b) Lower sorting net (16) Lower support shaft (rotating shaft) (25) Upper sorting net ( 26) Mesh of lower sorting net (30) Grain drop falling resistance surface (45) Pile discharge chute (59) Rice chaff discharge chute (72) Foreign matter discharge chute (74) Intake and exhaust dust fan (101) Planetary motion mechanism of gearless structure

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Karaiwa 428 Enami, Okayama City Seirei Industrial Co., Ltd. (72) Inventor Yasushi Shima Shima 428 Enami Okayama Seirei Industrial Co., Ltd. In-house

Claims (4)

[Scope of utility model registration request] 1. A cylindrical rotary sorting net for introducing grains to be sorted is formed by connecting an upper sorting net and a lower sorting net having different mesh sizes in series, and forming the mesh of the upper sorting net. Small, the one of the lower sorting net is large, the one that passes through the upper sorting net, the one that does not pass the upper sorting net and the lower sorting net, and the one that does not pass the upper and lower sorting nets A grain selection device, characterized in that it is configured to select one from the other. 2. The grain sorting apparatus according to claim 1, further comprising: an intake / exhaust dust fan connected to the upper part of the sorting chamber, which houses the sorting net, and the extraction route of the one passing through the net of the lower sorting net. . 3. The grain selecting device according to claim 1, wherein a grain adjusting drop resistance surface is provided at a lower end opening edge of the sorting net. 4. A small disc that supports an engaging shaft on a revolving shaft of the screening net, one end side of which is rotatably supported by the small disk, and the rotation shaft of the screening net is rotatable at the other end. The sorting net including a centrifugal link pivotally supported on the rotating shaft, an elastic small wheel that axially supports the rotary shaft, and a fixing ring that circumscribes the small wheel on a circumference around the revolution shaft. 2. The grain selection device according to claim 1, further comprising a planetary movement mechanism.