A multi-roller full-automatic rice length grade selection machine and method

Abstract

The application discloses a multi-roller full-automatic rice length grade selecting machine and method, which comprises a support, a feeding box for feeding the rice to be sorted is arranged above the support, a motor is arranged on one side of the feeding box, a support is arranged at the bottom of the motor for supporting the motor, a sieve cylinder I for receiving qualified rice is arranged on one side of the feeding box, and a sorting mechanism for automatically sorting the rice according to the length of the rice is arranged in the sieve cylinder I. In the multi-roller full-automatic rice length grade selecting machine and method, the sorting mechanism can accurately screen the substandard rice mixed in the normal rice, the rice falling into the sieve cylinder I can be sorted multiple times in the rolling sieve cylinder I, and the final sorting quality of the rice is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of grain processing technology, specifically to a multi-drum fully automatic rice length grading machine and method. Background Technology

[0002] Rice, an edible grain, also known as paddy rice or rice sorghum, is an annual herbaceous plant and one of my country's main food crops, with a long history of cultivation and a wide planting area. Rice is rich in nutrients, mainly containing water, carbohydrates, protein, lipids, minerals, and vitamins. The processing of rice involves the following steps: raw grain collection, raw grain cleaning, ridge finishing, grain-brown separation, milling, white rice grading, color sorting, polishing, white rice grading, finished rice packaging, storage, and transportation. During the processing of rice, broken rice and stone residue are often found in the raw grain collection, cleaning, and milling processes. To ensure the quality of the rice, it needs to be screened and graded to achieve a high-quality finished product.

[0003] Currently, common rice sorting machines typically use vibrating screens for impurity removal and length selection. The specific operation is as follows: First, the rice to be processed is placed into the vibrating screen for impurity removal and length selection. The vibrating screen usually has two layers of screens with different apertures. The aperture of the first layer is slightly larger than that of the second layer, but both layers serve the same purpose: length selection. The rice to be processed is placed into the first layer of screens, and the first vibration passes rice that fits the aperture size of that layer through... The rice is filtered and transferred to the surface of the second vibrating screen. The first vibrating screen filters out rice grains and stones that do not conform to its aperture size and retains them on its surface. This separates the rice from the two vibrating screens, allowing it to flow into the corresponding rice collection bin. However, in actual operation, some longer, normal-length rice grains may remain vertical during vibration and enter the second screen through smaller apertures, along with shorter or second-grade rice. This results in some normal-length rice being mixed in with the second-grade rice, reducing the overall rice sorting quality. To address this, we propose a multi-drum fully automatic rice length-grading sorting machine and method. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-drum fully automatic rice length grading machine and method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-drum fully automatic rice length grading sorting machine and method, comprising a support, a feeding box for feeding rice to be sorted is provided above the support, a motor is provided on one side of the feeding box, a bracket is provided at the bottom of the motor to support it, a sieve cylinder is provided on one side of the feeding box for receiving qualified rice, and a sorting mechanism for automatically sieving rice according to its length is provided inside the sieve cylinder.

[0006] Preferably, the sorting mechanism includes a main shaft located at one end of the motor shaft, the main shaft passing through the feeding box, a threaded blade on the outside of the main shaft, an arc-shaped plate on the outside of the threaded blade to receive the rice, a cover at one end of the screen cylinder, a fixing block on the inner wall of the cover, a connecting rod inside the fixing block, the connecting rod being located inside the arc-shaped plate and fixedly connected thereto, a plurality of centrally symmetrically distributed limiting holes for inserting rice on the inner wall of the screen cylinder, a plurality of transmission belts on the outside of the main shaft, rollers inside the transmission belts, a transmission disc on the outside of the rollers, a limiting ring on the outer wall of the screen cylinder, and a groove inside the transmission disc that matches the limiting ring.

[0007] Preferably, the outer wall of the main shaft is provided with a smoothing component for smoothing the rice falling from the feeding box. The smoothing component includes a second transmission belt located outside the main shaft, a first fixed shaft located on the inner wall of the second transmission belt, a turntable located outside the first fixed shaft, a protruding post located on one side of the turntable, a groove located outside the protruding post, a rotating rod located at one end of the groove, the rotating rod located on the outer wall of the main shaft and rotatably connected thereto, a smoothing plate located at one end of the rotating rod, and a plurality of through holes on the outer wall of the smoothing plate for rice to pass through.

[0008] Preferably, a fixing block 2 is provided on one side of the squeegee, a connecting rod 2 is provided inside the fixing block 2, a rotating plate is provided outside the connecting rod 2, and a torsion spring is provided between the rotating plate and the connecting rod 2. Under normal conditions, the elastic force of the torsion spring rotates the rotating plate to be parallel to the support.

[0009] Preferably, the end of the rotating plate is provided with multiple equidistant inclined grooves, all of which can allow rice to pass through.

[0010] Preferably, one end of the main shaft is provided with a secondary screening mechanism for secondary screening of the sorted secondary rice. The secondary screening mechanism includes a cylinder located outside the main shaft. The outer wall of the cylinder is provided with multiple connecting rods three. One end of each connecting rod three is provided with a screen cylinder two. The screen cylinder two is located inside the cover and is rotatably connected to it. One end of the screen cylinder two is provided with a connecting cover. The inside of the cylinder is provided with a secondary shaft. The outer wall of the secondary shaft is provided with threaded blades two. The outer side of the threaded blades two is provided with an arc-shaped plate two. The inner wall of the screen cylinder two is provided with multiple limiting holes two of the same size as the limiting hole one. One end of the arc-shaped plate two is provided with a discharge plate for discharging the secondary rice. The discharge plate passes through the connecting cover and is fixedly connected to it.

[0011] Preferably, the inside of the cover is provided with a discharge port one for discharging qualified rice, the inside of the connecting cover is provided with a discharge port two for discharging qualified rice, and the outer wall of the secondary shaft is provided with a support seat, the support seat being rotatably connected to the secondary shaft.

[0012] Preferably, one end of the sieve cylinder is provided with a connecting cylinder, one end of the connecting cylinder is fixedly connected to the material drop box, and the inside of the material drop box is provided with a channel for rice to fall, and the inner wall of the channel is shaped as a downward sloping surface.

[0013] Preferably, the height of the support base from the ground is less than the height of the material drop box from the ground, and both the first screen cylinder and the second screen cylinder form a 10° angle with the ground.

[0014] A method for using a multi-drum fully automatic rice length grading machine includes the following steps:

[0015] S1: After pouring the rice to be sorted into the feed box, start the motor;

[0016] S2: After passing through the channel, the rice flows into the interior of the first sieve cylinder, and the smoothing plate will smooth the rice at the bottom of the first sieve cylinder.

[0017] S3: The rotating sieve cylinder will cause qualified rice and substandard rice to enter the interior of the limiting hole at the same time, and cause the rice to rise along the inner wall of the sieve cylinder.

[0018] S4: When the rice rises to the highest point of the arc plate, the heavier qualified rice falls from the limiting hole into the screen cylinder, while the lighter second rice continues to rotate with the limiting hole and eventually falls into the interior of the arc plate.

[0019] S5: Qualified rice is discharged from the discharge port of the cover, and secondary rice is pushed into the screen cylinder by the propeller blade for re-screening.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, when rice needs to be sorted, the worker can first pour the rice into the feed box through the inlet. The rice will enter the interior of the sieve cylinder one through the channel. Then, the motor is started, causing the motor to drive the main shaft to rotate inside the sieve cylinder one. The rotating main shaft will drive the transmission belt one and the roller one to drive the transmission. In turn, the roller one will drive the transmission disc to rotate. The rotating transmission disc will mesh with the fixed ring on the outer wall of the sieve cylinder one, and finally the sieve cylinder one will continuously rotate on one side of the connecting cylinder. Since each limiting hole one can only hold a single rice grain, the normal rice and the second-grade rice inside the sieve cylinder one will enter the interior of the corresponding limiting hole one. As the sieve cylinder one rotates, the normal rice and the second-grade rice will gradually rise along the inner wall of the sieve cylinder one. During the rising process... Because the normal rice is longer and heavier than the secondary rice, it will detach from the limiting hole one before the secondary rice during its continuous ascent and eventually fall into the screen cylinder one, where it is discharged through the discharge port of the cover. Some of the lighter secondary rice will continue to rise with the screen cylinder one until the orientation angle of the limiting hole one inside the screen cylinder one approaches the center of the main shaft. At this point, the secondary rice inside the limiting hole one will detach from the limiting hole one and eventually fall into the sliding arc plate one. Then, through the transmission effect of the threaded blade one, it will be pushed to one end of the screen cylinder one for re-screening. Using the sorting mechanism, the secondary rice mixed with the normal rice can be screened more accurately. The rice falling into the screen cylinder one can be sorted multiple times inside the rolling screen cylinder one, which greatly improves the final sorting quality of the rice.

[0022] 2. In this invention, after the worker pours the rice to be screened into the sieve cylinder, the motor drives the main shaft to rotate. The main shaft then drives the transmission belt and the fixed shaft, which in turn drives the turntable to rotate. During this process, the protrusion on the turntable rotates along the fixed shaft, causing the groove outside the protrusion to deflect left or right along the main shaft. When the protrusion rotates more than 180° with the turntable, the direction of deflection of the groove along the main shaft will be opposite to the previous rotation direction. This cycle repeats. As the main shaft continues to rotate, the smearing plate, which is fixedly connected to the trough, will also rotate back and forth. This allows the smearing plate to repeatedly smooth the rice poured in from the channel opening, ensuring that the rice to be sorted is evenly spread on the inner wall of the first sieve cylinder, making it easier for the first sieve cylinder to fully sieve the rice. At the same time, the rotating plate located on one side of the smearing plate, under the elastic force of the torsion spring, will also push the accumulated rice more evenly, keeping the rice at a similar height on the inner wall of the first sieve cylinder, further improving the sorting effect and sieving quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a side view of the structure of the present invention;

[0025] Figure 3 This is a partial structural cross-sectional view of the present invention;

[0026] Figure 4 For the present invention Figure 3 Enlarged view of the structure of region A in the middle;

[0027] Figure 5 For the present invention Figure 3 Enlarged view of the structure of region B in the middle;

[0028] Figure 6 This is a partial front view of the structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the sieve cylinder of the present invention;

[0030] Figure 8 This is a partial structural cross-sectional view of the present invention;

[0031] Figure 9 For the present invention Figure 8 Enlarged view of the structure of region C in the middle;

[0032] Figure 10 For the present invention Figure 8 Enlarged view of the structure of region D in the middle;

[0033] Figure 11 This is a partial structural cross-sectional view of the present invention;

[0034] Figure 12 For the present invention Figure 11 Enlarged view of the structure of region E in the middle;

[0035] Figure 13 For the present invention Figure 11 Enlarged view of the structure of the F region.

[0036] In the diagram: 1-Support; 2-Feeding box; 3-Motor; 4-Bracket; 5-Screen cylinder one; 6-Sorting mechanism; 61-Main shaft; 62-Threaded paddle one; 63-Arc plate one; 64-Cover; 65-Fixing block one; 66-Connecting rod one; 67-Limiting hole one; 68-Transmission belt one; 69-Roller one; 610-Transmission disc; 611-Limiting ring; 612-Groove; 7-Smoothing assembly; 71-Transmission belt two; 72-Fixing shaft one; 73-Turntable; 74-Protruding column; 75-Groove; 7 6-Rotating rod; 77-Plate; 78-Through hole; 8-Fixing block two; 9-Connecting rod two; 10-Rotating plate; 11-Torsion spring; 12-Inclined groove; 13-Re-screening mechanism; 131-Cylinder; 132-Connecting rod three; 133-Screen cylinder two; 134-Connecting cover; 135-Secondary shaft; 136-Threaded blade two; 137-Arc plate two; 138-Limiting hole two; 139-Discharge plate; 14-Discharge port one; 15-Discharge port two; 16-Support base; 17-Connecting cylinder; 18-Channel. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1-13This invention provides a technical solution: a multi-drum fully automatic rice length grading sorting machine and method. This solution solves the problems mentioned in the background art. The solution makes corresponding improvements to address these problems, including a support 1, a feeding box 2 for feeding rice to be sorted, a motor 3 on one side of the feeding box 2, a support bracket 4 at the bottom of the motor 3, a support bracket 4 on one side of the motor 3, a motor motor 3 on one side of the motor 3, and a support for the motor 3. The support bracket 4 is fixedly connected to the feeding box 2 on one side, and the motor 3 is fixedly connected to the support bracket 4 on one side. A support for receiving rice is also provided on one side of the feeding box 2. The sieve cylinder 5 has a connecting cylinder 17 at one end, which is fixedly connected to the discharge box 2. The sieve cylinder 5 and the connecting cylinder 17 are rotatably connected. The discharge box 2 has a channel 18 for rice to fall through. The inner wall of the channel 18 is sloping downwards, which facilitates the rice to enter the sieve cylinder 5 from the discharge box 2. The sieve cylinder 5 has a sorting mechanism 6 that automatically sorts the rice according to its length. The sorting mechanism 6 in this solution includes a main shaft 61 located at one end of the motor 3's rotating shaft. The main shaft 61 passes through the discharge box 2 and is connected to the motor. 3. A rotating shaft is fixedly connected. A threaded blade 62 is provided on the outside of the main shaft 61, and the threaded blade 62 is fixedly connected to the main shaft 61. An arc-shaped plate 63 is provided on the outside of the threaded blade 62 to support the secondary particles. One end of the screen cylinder 5 is provided with a cover 64, which is rotatably connected to the screen cylinder 5. A fixing block 65 is provided on the inner wall of the cover 64 and is fixedly connected to it. A connecting rod 66 is provided inside the fixing block 65 and is fixedly connected to it. The connecting rod 66 is located inside the arc-shaped plate 63 and is fixedly connected to it. The inner wall of the screen cylinder 5 is provided with multiple... The rice is inserted through centrally symmetrically distributed limiting holes 67. The limiting blocks are densely distributed on the inner wall of the sieve cylinder 5, which can fully sort the rice in the sieve cylinder 5. Multiple transmission belts 68 are provided on the outside of the main shaft 61. Rollers 69 are provided inside the transmission belts 68. The transmission belts 68 can drive the rollers 69 and the main shaft 61 to drive simultaneously. The rollers 69 are provided with a transmission disc 610 and are fixedly connected to it. The outer wall of the sieve cylinder 5 is provided with a limiting ring 611 and is fixedly connected to it. The transmission disc 610 has a groove 612 that matches the limiting ring 611 inside.

[0039] When rice needs to be sorted, the worker can first pour the rice into the feed box 2 through the inlet. The rice will enter the screen cylinder 5 through the channel 18. Then, the motor 3 is started, causing the main shaft 61 to rotate inside the screen cylinder 5. The rotating main shaft 61 will drive the transmission belt 68 and the roller 69 to drive the transmission disc 610 to rotate. The rotating transmission disc 610 will mesh with the fixed ring on the outer wall of the screen cylinder 5, and finally the screen cylinder 5 will rotate continuously on one side of the connecting cylinder 17. Since each limiting hole 67 can only hold a single piece of rice, the normal rice and the second-grade rice inside the screen cylinder 5 will enter the corresponding limiting hole 67. As the screen cylinder 5 rotates, the normal rice and the second-grade rice will gradually rise along the inner wall of the screen cylinder 5. During the rising process... In the process, because the normal rice is longer and heavier than the secondary rice, the normal rice will detach from the limiting hole 67 before the secondary rice during its continuous ascent and eventually fall into the screen cylinder 5 and be discharged through the discharge port 14 of the cover 64. Some of the lighter secondary rice will continue to rise with the screen cylinder 5 until the orientation angle of the limiting hole 67 in the screen cylinder 5 approaches the center of the main shaft 61. At this point, the secondary rice inside the limiting hole 67 will detach from the limiting hole 67 and eventually fall into the sliding arc plate 63. Then, through the transmission effect of the threaded blade 62, it will be pushed to one end of the screen cylinder 5 for re-screening. Using the sorting mechanism 6, the secondary rice mixed with the normal rice can be screened more accurately. The rice falling into the screen cylinder 5 can be sorted multiple times inside the rolling screen cylinder 5, which greatly improves the final sorting quality of the rice.

[0040] Furthermore, the outer wall of the main shaft 61 is provided with a smoothing component 7 for smoothing the rice falling from the feed box 2. The smoothing component 7 includes a second transmission belt 71 located outside the main shaft 61. The inner wall of the second transmission belt is provided with a first fixed shaft 72, which is rotatably connected to the feed box 2. The second transmission belt 71 can simultaneously drive the first fixed shaft 72 and the main shaft 61 for transmission. The outer side of the first fixed shaft 72 is provided with a turntable 73 and is rotatably connected to it. One side of the turntable 73 is provided with a protrusion 74 and is fixedly connected to it. The outer side of the protrusion 74 is provided with a groove 75. One end of the groove 75 is provided with a rotating rod 76, which is located on the outer wall of the main shaft 61 and is rotatably connected to it. One end of the rotating rod 76 is provided with a smoothing plate 77 and is fixedly connected to it. The outer wall of the smoothing plate 77 is provided with multiple through holes 7 for rice to pass through. 8. A fixing block 2 8 is provided on one side of the smearing plate 77 and is fixedly connected to it. A connecting rod 2 9 is provided inside the fixing block 2 8 and is fixedly connected to it. A rotating plate 10 is provided outside the connecting rod 2 9. The rotating plate 10 is rotatably connected to the connecting rod 2 9. A torsion spring 11 is provided between the rotating plate 10 and the connecting rod 2 9. The two ends of the torsion spring 11 are fixedly connected to the rotating plate 10 and the connecting rod 2 9 respectively. Under normal conditions, the elastic force of the torsion spring 11 rotates the rotating plate 10 to be parallel to the support 1. The end of the rotating plate 10 is provided with multiple equally spaced inclined grooves 12. The inclined grooves 12 can all be passed through the rice. The multiple inclined grooves 12 at the end of the rotating plate 10 can effectively disperse the rice when the rotating plate 10 smooths the piled rice, making it easier to spread the rice evenly on the inner wall of the sieve cylinder 5.

[0041] After the worker pours the rice to be screened into the screen cylinder 5, the motor 3 will drive the main shaft 61 to rotate. The main shaft 61 will then drive the transmission belt 71 and the fixed shaft 72, which in turn will drive the turntable 73 to rotate. During this process, the protrusion 74 on the turntable 73 will rotate along the fixed shaft 72, causing the trough 75 located outside the protrusion 74 to deflect to the left or right along the main shaft 61. When the protrusion 74 rotates more than 180° with the turntable 73, the direction of deflection of the trough 75 along the main shaft 61 will be opposite to the previous rotation direction. In the cycle, with the continuous rotation of the main shaft 61, the smearing plate 77, which is fixedly connected to the trough 75, will also rotate back and forth. The smearing plate 77 can repeatedly smooth the rice poured in from the channel 18, so that the rice to be sorted is spread more evenly on the inner wall of the sieve cylinder 5, making it easier for the sieve cylinder 5 to fully sieve the rice. At the same time, the rotating plate 10 located on one side of the smearing plate 77 will also push the piled rice more evenly under the elastic force of the torsion spring 11, so that the rice located on the inner wall of the sieve cylinder 5 is kept at a similar height, further improving the sorting effect of the rice and improving the sieving quality.

[0042] One end of the main shaft 61 is equipped with a secondary screening mechanism 13 for secondary screening of the sorted rice. The secondary screening mechanism 13 includes a cylinder 131 located outside the main shaft 61, which is fixedly connected to the main shaft 61. The outer wall of the cylinder 131 is provided with multiple connecting rods 132. One end of each connecting rod 132 is provided with a screen cylinder 133. The two ends of the connecting rods 132 are fixedly connected to the cylinder 131 and the screen cylinder 133, respectively. The screen cylinder 133 is located at the top of the cover. The screen cylinder 133 is rotatably connected to the interior of body 64. One end of the screen cylinder 133 is provided with a connecting cover 134, which is rotatably connected to the screen cylinder 133. Inside the cylinder 131, there is a secondary shaft 135, which is fixedly connected to the cylinder 131. The outer wall of the secondary shaft 135 is provided with a threaded blade 136, which is fixedly connected to the secondary shaft 135. The outer surface of the threaded blade 136 is provided with an arc-shaped plate 137. The screen cylinder 133... The inner wall is provided with multiple limiting holes 138 of the same size as the limiting hole 67. One end of the arc plate 137 is provided with a discharge plate 139 for discharging substandard rice. One end of the discharge plate 139 is fixedly connected to the arc plate 137. The discharge plate 139 passes through the connecting cover 134 and is fixedly connected to it. The inside of the cover 64 is provided with a discharge port 14 for discharging qualified rice. The inside of the connecting cover 134 is provided with a discharge port 15 for discharging qualified rice. The outer wall of the secondary shaft 135 is provided with a support seat 16. One side of the connecting cover 134 is fixedly connected to the support seat 16. The support seat 16 is rotatably connected to the secondary shaft 135. The height of the support seat 16 from the ground is less than the height of the discharge box 2 from the ground. The screen cylinder 5 and the screen cylinder 2 133 are both at a 10° angle to the ground. The overall sorting machine is inclined to the ground, which can more conveniently and effectively transmit the rice inside the screen cylinder 5 and the screen cylinder 2 133, which is conducive to the collection of substandard rice and normal rice.

[0043] When some normal rice mixed with the secondary rice enters the interior of the screen cylinder 133 through the arc plate 63, the rotating main shaft 61 will drive the cylinder 131 to rotate, and the cylinder 131 will also drive the screen cylinder 133 at one end of the connecting rod 132 to rotate. At the same time, the secondary shaft 135 located inside the cylinder 131 will also drive the threaded blade 136 to rotate, pushing the secondary rice finally selected above the arc plate 137. The limiting hole 138 inside the screen cylinder 133 is the same size as the limiting hole 67 inside the screen cylinder 5. Then, according to the weight and length of the secondary rice and normal rice, the normal rice and secondary rice can be discharged out through the discharge port 15 and the discharge plate 139 respectively. Using the re-screening mechanism 13, the normal rice mixed with the secondary rice can be sorted again, further improving the overall screening quality of rice.

[0044] A method for using a multi-drum fully automatic rice length grading machine includes the following steps:

[0045] S1: After pouring the rice to be sorted into the inside of the feed box 2, start the motor 3;

[0046] S2: After passing through channel 18, the rice flows into the interior of sieve cylinder 5, and the smoothing plate 77 will smooth the rice at the bottom of sieve cylinder 5.

[0047] S3: The rotating sieve cylinder 5 will cause qualified rice and substandard rice to enter the interior of the limiting hole 67 at the same time, and cause the rice to rise along the inner wall of the sieve cylinder 5.

[0048] S4: When the rice rises to the highest point of the arc plate 63, the heavier qualified rice falls from the limiting hole 67 into the sieve cylinder 5, while the lighter second rice continues to rotate with the limiting hole 67 and eventually falls into the interior of the arc plate 63.

[0049] S5: Qualified rice is discharged from the discharge port 14 of the cover 64, and secondary rice is pushed by the propeller blade 1 into the screen cylinder 133 for re-screening.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-drum fully automatic rice length grading machine, comprising a support (1), characterized in that: Above the support (1) is a feeding box (2) for feeding rice to be sorted. A motor (3) is provided on one side of the feeding box (2). A bracket (4) is provided at the bottom of the motor (3) to support it. A sieve cylinder (5) is provided on one side of the feeding box (2) to receive qualified rice. A sorting mechanism (6) is provided inside the sieve cylinder (5) to automatically sieve the rice according to its length. The sorting mechanism (6) includes a main shaft (61) located at one end of the motor (3) shaft. The main shaft (61) passes through the discharge box (2). A threaded blade (62) is provided on the outside of the main shaft (61). An arc-shaped plate (63) is provided on the outside of the threaded blade (62) to receive the material. A cover (64) is provided at one end of the screen cylinder (5). A fixing block (65) is provided on the inner wall of the cover (64). A connecting rod (66) is provided inside the fixing block (65). The connecting rod (66) is located on the arc-shaped plate. The inner wall of the sieve cylinder (5) is provided with a plurality of centrally symmetrically distributed limiting holes (67) for rice insertion. The outer side of the main shaft (61) is provided with a plurality of transmission belts (68). The inner side of the transmission belts (68) is provided with rollers (69). The outer side of the rollers (69) is provided with a transmission disc (610). The outer wall of the sieve cylinder (5) is provided with a limiting ring (611). The inner side of the transmission disc (610) is provided with a groove (612) that matches the limiting ring (611). The outer wall of the main shaft (61) is provided with a smoothing component (7) for smoothing the rice falling from the feed box (2). The smoothing component (7) includes a second transmission belt (71) located outside the main shaft (61). The inner wall of the second transmission belt (71) is provided with a first fixed shaft (72). The outer side of the first fixed shaft (72) is provided with a turntable (73). One side of the turntable (73) is provided with a protruding post (74). The outer side of the protruding post (74) is provided with a groove (75). One end of the groove (75) is provided with a rotating rod (76). The rotating rod (76) is located on the outer wall of the main shaft (61) and is rotatably connected to it. One end of the rotating rod (76) is provided with a smoothing plate (77). The outer wall of the smoothing plate (77) is provided with multiple through holes (78) for rice to pass through. The trowel plate (77) has a fixed block two (8) on one side, a connecting rod two (9) inside the fixed block two (8), a rotating plate (10) outside the connecting rod two (9), and a torsion spring (11) between the rotating plate (10) and the connecting rod two (9). Under normal conditions, the elastic force of the torsion spring (11) rotates the rotating plate (10) to be parallel to the support (1). The end of the rotating plate (10) is provided with a plurality of equally spaced inclined grooves (12), all of which can be used by rice.

2. The multi-drum fully automatic rice length grading machine according to claim 1, characterized in that: One end of the main shaft (61) is provided with a secondary screening mechanism (13) for secondary screening of the sorted rice. The secondary screening mechanism (13) includes a cylinder (131) located outside the main shaft (61). The outer wall of the cylinder (131) is provided with multiple connecting rods (132). One end of each connecting rod (132) is provided with a sieve cylinder (133). The sieve cylinder (133) is located inside the cover (64) and rotatably connected to it. One end of the sieve cylinder (133) is provided with a connecting cover (134). The inner wall of the cylinder (131) is provided with a secondary shaft (135), the outer wall of the secondary shaft (135) is provided with a threaded blade (136), the outer wall of the threaded blade (136) is provided with an arc plate (137), the inner wall of the screen cylinder (133) is provided with multiple limiting holes (138) of the same size as the limiting hole (67), one end of the arc plate (137) is provided with a discharge plate (139) for discharging rice, and the discharge plate (139) passes through the connecting cover (134) and is fixedly connected to it.

3. The multi-drum fully automatic rice length grading machine according to claim 2, characterized in that: The cover (64) has a discharge port 1 (14) for qualified rice to be discharged inside, the connecting cover (134) has a discharge port 2 (15) for qualified rice to be discharged inside, and the outer wall of the secondary shaft (135) has a support seat (16), which is rotatably connected to the secondary shaft (135).

4. The multi-drum fully automatic rice length grading machine according to claim 3, characterized in that: One end of the sieve cylinder (5) is provided with a connecting cylinder (17), one end of the connecting cylinder (17) is fixedly connected to the discharge box (2), and the discharge box (2) is provided with a channel (18) for rice to fall inside. The inner wall of the channel (18) is shaped as a downward inclined surface.

5. The multi-drum fully automatic rice length grading machine according to claim 4, characterized in that: The maximum height of the support base (16) from the ground is less than the maximum height of the material drop box (2) from the ground. The first screen cylinder (5) and the second screen cylinder (133) are both at a 10° angle to the ground.

6. A method of using a multi-drum fully automatic rice length grading machine, comprising using the multi-drum fully automatic rice length grading machine as described in claim 5, characterized in that: Includes the following steps: S1: After pouring the rice to be sorted into the inside of the feed box (2), start the motor (3); S2: After passing through the channel (18), the rice flows into the interior of the sieve cylinder (5), and the smearing plate (77) will smooth the rice at the bottom of the sieve cylinder (5). S3: The rotating sieve cylinder (5) will cause qualified rice and substandard rice to enter the interior of the limiting hole (67) at the same time, and cause the rice to rise along the inner wall of the sieve cylinder (5). S4: When the rice rises to the highest point of the arc plate (63), the heavier qualified rice falls from the limiting hole (67) into the sieve cylinder (5), while the lighter second rice continues to rotate with the limiting hole (67) and eventually falls into the interior of the arc plate (63). S5: Qualified rice is discharged from the discharge port (14) of the cover (64), and secondary rice is pushed by the propeller blade to the screen cylinder (133) for re-screening.

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