Broken rice screening device for rice production

Abstract

This application relates to the field of grain screening equipment technology, and discloses a broken rice screening device for rice production, including a frame and a screen cylinder. The screen cylinder is arranged at an incline. Two drive shafts with parallel axes are rotatably mounted on the top of the frame. Support wheels are fixedly sleeved on the shafts at both ends of the drive shafts. Several material-pushing plates are fixedly connected to the inner wall of the screen cylinder. A connecting frame is fixedly connected to the top of the frame. This invention uses material-pushing plates to lift the material at the bottom of the screen cylinder to an inclined plate and guide it to a guide plate. A swing mechanism drives the guide plate to vibrate reciprocally, causing the material to actively separate during its descent. This allows broken rice to seep to the bottom layer under disturbance. Then, a separating plate separates the high-broken-rice-ratio material at the bottom layer from the low-broken-rice-rice-ratio material at the top layer, allowing broken rice to be actively exposed and directly contact the inner wall of the screen cylinder, improving the screening efficiency of the screening device and ensuring screening quality.

Description

Technical Field

[0001] This application relates to the field of grain screening equipment technology, and in particular to a broken rice screening device for rice production. Background Technology

[0002] In the grain processing industry, broken rice screening is a crucial step in ensuring the grade of finished rice. Currently, broken rice screening devices mainly consist of a frame, a screen cylinder with perforations, a drive mechanism, and a feeding mechanism. During operation, the rice to be screened is fed into the inlet end of the screen cylinder by the feeding mechanism. Driven by the drive mechanism, the screen cylinder rotates continuously around its axis. The rice grains tumble on the inner wall of the cylinder and slowly move axially towards the outlet end. Broken rice grains with a diameter smaller than the perforations pass through the perforations during the rolling process, achieving separation, while intact rice grains are discharged from the outlet end.

[0003] However, during the operation of the broken rice screening device, due to the different particle sizes and densities of the rice grains, segregation naturally occurs within the material layer during the rotation of the drum. This manifests as stratification of the particle flow at the free surface of the mixing area. Specifically, smaller-sized broken rice gradually gathers towards the bottom of the material layer under the action of vibration and leakage. In the mixing area at the bottom of the drum, due to the action of leakage, convection, and other mechanisms, broken rice gathers in the center of the material layer, while intact rice grains are surrounded by segregation. This makes it difficult for broken rice to directly contact the sieve holes on the inner wall of the sieve cylinder. Some broken rice is carried towards the discharge end and cannot pass through the sieve holes in time, reducing the screening area and resulting in reduced screening efficiency. Furthermore, a large amount of broken rice may still be mixed into the finished rice, affecting the quality of the final product. Summary of the Invention

[0004] This application proposes a broken rice screening device for rice production, which has the advantages of actively regulating the distribution of broken rice in the material layer and promoting the timely exposure of broken rice on the screen surface, thereby solving the problems existing in the current broken rice screening device.

[0005] To achieve the above objectives, this application adopts the following technical solution: a broken rice screening device for rice production, comprising a frame and a screen cylinder, wherein the screen cylinder is arranged at an inclination, and two drive shafts with parallel axes are rotatably arranged on the top of the frame, and support wheels are fixedly sleeved on the shafts at both ends of the drive shafts, and a plurality of material-pulling plates are fixedly connected to the inner wall of the screen cylinder, a connecting frame is fixedly connected to the top of the frame, and an inclined plate is fixedly connected to the top of the connecting frame located on the inner side of the screen cylinder, a guide plate is provided inside the screen cylinder, and a material-dividing plate is provided at the bottom of the connecting frame;

[0006] One side of the frame is provided with a swing mechanism for driving the material guide plate to move reciprocally. The swing mechanism can drive the material guide plate to move reciprocally along the axial direction of the screen cylinder. The material shifting plate is used to cooperate with the rotation of the screen cylinder to lift the rice material onto the inclined plate. Among the materials that fall onto the material distribution plate through the inclined plate, the top layer of materials passes over the material distribution plate and falls to the rotating rising side of the screen cylinder. The material distribution plate separates the materials at the bottom layer and guides the materials to the rotating descending side of the screen cylinder.

[0007] Further, the inclined plate is arranged in an inclined manner, both sides of the screen cylinder are provided with limiting grooves, one side of the top of the frame is provided with a driving mechanism, and one side of the top of the frame is fixedly provided with a feeding mechanism.

[0008] Further, the cross-section of the material shifting plate is in a broken line shape, and a plurality of material shifting plates are annularly arranged in an evenly spaced manner. The material guide plate is located at the bottom of the inclined plate and is arranged in an inclined manner. The cross-section of the material distribution plate is in a "C" shape with both the top and bottom arranged in an inclined manner. The plate surface of the top part of the material distribution plate is arranged in an inclined manner in the radial direction of the screen cylinder, and the distance between the top part of the material distribution plate and the top surface of the material guide plate gradually decreases along the direction in which the axis of the screen cylinder descends.

[0009] The cutting thickness of the material distribution plate into the material layer at different positions in the axial direction of the screen cylinder is different. The content of broken rice in the material near the feeding end is relatively high, and the gap between the material distribution plate and the material guide plate is relatively large, which can accommodate a thicker bottom layer enriched with broken rice. As the material advances towards the discharging end, most of the broken rice has been screened out, the content of broken rice in the material gradually decreases, the gap between the material distribution plate and the material guide plate decreases synchronously, and only a thinner bottom layer of material is separated, so as to improve the adaptation degree between the separation thickness and the broken rice content at the corresponding position.

[0010] Further, connecting seats are fixedly arranged on both sides of the top of the frame, the top of the connecting seat is slidably connected with a moving plate, the material guide plate is fixedly connected with the moving plate, the swing mechanism comprises a rotating disc, one side of the moving plate corresponding to the connecting seat is provided with an adjusting groove, the inner side of the adjusting groove is slidably sleeved with a shifting member, and one side of the top of the frame is provided with a transmission mechanism.

[0011] While the driving mechanism drives the screen cylinder to rotate, power is transmitted to the swing mechanism through the transmission mechanism, so as to drive the moving plate to move reciprocally.

[0012] Further, the rotating disc is rotatably connected with the corresponding connecting seat through a rotating shaft, the extending direction of the adjusting groove is adapted to the radial direction of the screen cylinder, the shifting member is configured as a rolling bearing, the inner ring of the rolling bearing is fixedly connected with the rotating disc, the outer ring of the rolling bearing is slidably sleeved with the adjusting groove, and the extending length of the adjusting groove is adapted to the range in which the shifting member rotates around the axis of the rotating disc.

[0013] Furthermore, the transmission mechanism includes a first bevel gear and two drive wheels. The first bevel gear is rotatably connected to the frame via a rotating shaft. The first bevel gear is coaxially connected to the corresponding drive wheel via the rotating shaft. One of the two drive shafts is fixedly sleeved with the corresponding drive wheel. The two drive wheels are connected by a transmission belt. The rotating disk is coaxially connected to a second bevel gear via a rotating shaft. The second bevel gear meshes with the first bevel gear.

[0014] Furthermore, a number of connecting rods are fixedly connected to the top of the material distribution plate. The connecting rods are slidably sleeved with the connecting frame. A push rod is fixedly installed on the frame of the connecting frame. The output end of the push rod is fixedly connected to the corresponding connecting rod. A vision sensor is fixedly installed on one side of the inclined plate. The number of vision sensors is at least two.

[0015] The vision sensor detects the image information of the material on the top of the inclined plate and the guide plate in real time and feeds it back to the processor. The processor analyzes the broken rice content at the corresponding position. When the broken rice rate exceeds the preset rated value, the controller controls the No. 1 push rod to move according to the processor's processing result. This pushes the connecting rod to move the material distribution plate radially along the screen cylinder, increasing the distance between the top of the material distribution plate and the guide plate. This allows more material with a high broken rice rate at the bottom to be separated and guided to the rotating and descending side of the screen cylinder for screening. When the broken rice rate is lower than the rated value, the No. 1 push rod moves in the opposite direction to reduce the material distribution gap and reduce the amount of material separated.

[0016] A vision sensor is used to acquire images of rice particles within a preset detection area on the inclined plate and guide plate. The preset detection area, along the axial direction of the screen cylinder, includes at least a first detection area near the feed end and a second detection area near the discharge end. The processor uses the particle images acquired by the vision sensor as input to identify the outlines of the rice particles in the images and determines the particle type based on the particle's projected area, projected length, or equivalent particle size. Particles smaller than a preset broken rice determination threshold are identified as broken rice. This preset broken rice determination threshold is pre-calibrated based on the screen cylinder aperture size or the specifications of the rice to be screened.

[0017] The processor calculates the broken rice rate of the corresponding detection area based on the proportion of broken rice particles in terms of quantity, area, or equivalent particle size, and sends the broken rice rate as an output to the controller. The controller controls the movement of push rod number one based on a comparison of the broken rice rate with a preset threshold. This push rod moves the connecting rod and the material distribution plate radially along the screen cylinder, thereby adjusting the material distribution distance between the material distribution plate and the guide plate. Specifically, when the broken rice rate is greater than the first preset threshold, the controller controls push rod number one to move in the direction that moves the material distribution plate away from the guide plate, increasing the material distribution distance. When the broken rice rate is less than the second preset threshold, the controller controls push rod number one to move in the opposite direction, decreasing the material distribution distance. The first preset threshold is the upper limit threshold used to determine if the broken rice rate in the current detection area is too high and trigger an increase in the material distribution distance. The second preset threshold is the lower limit threshold used to determine if the broken rice rate in the current detection area is too low and trigger a decrease in the material distribution distance. The first preset threshold is greater than the second preset threshold. The first and second preset thresholds are preset based on the specifications of the rice to be screened, the screen cylinder aperture size, the required broken rice rate of the finished rice, or the equipment trial run calibration results.

[0018] Furthermore, a movable rod is slidably arranged on one side of the connecting frame, and a rack is fixedly connected to the rod body. Several adjusting shafts are rotatably arranged on the side of the connecting frame near the guide plate. Gears are fixedly sleeved at the ends of the adjusting shafts, and adjusting plates are fixedly connected to the bottom ends of the adjusting shafts. The adjusting plates adjust the amount of material moving in the axial direction of the screen cylinder at the top of the guide plate. A second push rod is fixedly arranged on the side of the connecting frame near the guide plate.

[0019] The second push rod drives the moving rod to move the rack along the axial direction of the screen cylinder. The rack meshes with the gear and the adjusting shaft to rotate, which in turn drives the adjusting plate to deflect, changing the angle and orientation of the adjusting plate relative to the top surface of the guide plate. This adjusts the flow and distribution of the material at the top of the guide plate in the axial direction of the screen cylinder. When the broken rice content in the material at the discharge end of the screen cylinder is extremely low, a portion of the material can be guided to the rear end of the screen cylinder for direct screening through the adjusting plate. This, combined with the feeding mechanism, increases the feeding amount, making full use of the screening capacity throughout the entire length of the screen cylinder and improving the equipment's throughput.

[0020] Furthermore, the axial direction of the adjusting shaft is adapted to the normal direction of the top surface of the guide plate, the bottom surface of the adjusting plate is adapted to the top surface of the guide plate, the number of racks is adapted to the number of adjusting shafts, the racks mesh with the corresponding gears, and the output end of the second push rod is fixedly connected to the moving rod.

[0021] The beneficial effects of this invention are as follows:

[0022] This application provides a broken rice screening device for rice production. A material lifting plate raises the material at the bottom of the screen cylinder to an inclined plate and guides it to a guide plate. A swing mechanism drives the guide plate to vibrate reciprocally, causing the material to actively separate during its descent. This allows broken rice to seep to the bottom layer under disturbance. A separating plate then separates the bottom layer (high broken rice ratio) from the top layer (low broken rice ratio), preventing broken rice from being encased in whole grains and actively exposing it. This increases the contact probability between broken rice and the screen openings, thereby improving screening efficiency. Simultaneously, the separating plate guides the bottom layer material to the rotating and descending side of the screen cylinder, allowing broken rice to directly contact the inner wall of the screen cylinder, increasing the contact area between the material layer and the screen cylinder, further improving the screening efficiency and ensuring screening quality. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of part of the structure of the present invention;

[0026] Figure 3 This is a side sectional view of the inner part of the sieve cylinder structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the movable plate of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure at the drive shaft of the present invention;

[0029] Figure 6 This is a schematic diagram of the transmission mechanism of the present invention;

[0030] Figure 7 For the present invention Figure 6 Enlarged view of the structure at point A in the image;

[0031] Figure 8 This is a schematic diagram of a portion of the rack structure of the present invention.

[0032] In the diagram: 1. Frame; 2. Screen cylinder; 3. Drive shaft; 4. Support wheel; 5. Feeding plate; 6. Transmission mechanism; 601. Drive wheel; 602. First bevel gear; 603. Second bevel gear; 7. Inclined plate; 8. Guide plate; 9. Distributing plate; 10. Feeding mechanism; 11. Moving plate; 12. Connecting seat; 13. Drive mechanism; 14. Adjusting groove; 15. Actuating component; 16. Rotating disk; 17. Connecting frame; 18. Connecting rod; 19. Vision sensor; 20. Adjusting plate; 21. Adjusting shaft; 22. Rack; 23. Gear; 24. Moving rod; 25. First push rod; 26. Second push rod. Detailed Implementation

[0033] 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.

[0034] Example 1, as Figures 1-7 A broken rice screening device for rice production includes a frame 1 and a screen cylinder 2. The screen cylinder 2 has a number of screen holes for broken rice to pass through at even intervals. The screen cylinder 2 is inclined, with the higher end of the screen cylinder 2 being the feed end and the lower end being the discharge end. Two drive shafts 3 with parallel axes are rotatably mounted on the top of the frame 1. Support wheels 4 are fixedly sleeved on the shafts at both ends of the drive shafts 3. Limit grooves are opened on both sides of the screen cylinder 2. The support wheels 4 are in contact with the grooves of the limit grooves. The support wheels 4 are used to cooperate with the limit grooves to support and limit the screen cylinder 2 and can drive the screen cylinder 2 to rotate circumferentially. A drive mechanism 13 is provided on one side of the top of the frame 1. The drive mechanism 13 is used for the synchronous rotation of the two drive shafts 3. Specifically, the drive mechanism includes a geared motor and two transmission wheels. The two transmission wheels are fixedly sleeved on the corresponding drive shafts 3. The output end of the geared motor is connected to the corresponding transmission wheel. The two transmission wheels are connected by a transmission belt.

[0035] A feeding mechanism 10 is fixedly installed on one side of the top of the frame 1. The feeding mechanism 10 is used to feed the rice grains to be screened into the screen cylinder 2. (See reference) Figure 3, the inner wall of the screen drum 2 is fixedly connected with a plurality of material shifting plates 5. The cross-section of the material shifting plates 5 is in a folded line shape, and the plurality of material shifting plates 5 are annularly arranged in a uniformly spaced manner. The top of the frame 1 is fixedly connected with a connecting frame 17, the screen drum 2 is located outside the connecting frame 17, the top of the part of the connecting frame 17 located inside the screen drum 2 is fixedly connected with an inclined plate 7, and the inclined plate 7 is arranged in an inclined manner. The material shifting plate 5 is bent towards the direction of the rotational advance of the screen drum 2, and is used for cooperating with the rotation of the screen drum 2 to drive part of the materials inside the screen drum 2 to the top of the inclined plate 7. Both sides of the top of the frame 1 are fixedly provided with connecting seats 12, the top of the connecting seat 12 is slidably connected with a moving plate 11, part of the moving plate 11 extends into the screen drum 2, a material guide plate 8 is fixedly connected between the two moving plates 11, the material guide plate 8 is located at the bottom of the inclined plate 7 and is arranged in an inclined manner, and is used for guiding the materials to the rotating rising side of the screen drum 2.

[0036] The bottom of the connecting frame 17 is provided with a material distributing plate 9. The cross-section of the material distributing plate 9 is in a "U" shape with the top and bottom both arranged in an inclined manner. The plate surface of the top part of the material distributing plate 9 is arranged in an inclined manner in the radial direction of the screen drum 2. The distance between the top part of the material distributing plate 9 and the top surface of the material guide plate 8 gradually decreases along the direction in which the axis of the screen drum 2 descends. At different positions in the axial direction of the screen drum 2, the broken rice rate shows a gradually decreasing trend as the screening proceeds, so that the thickness of the bottom layer of the material on the material guide plate 9 distributed by the material distributing plate 9 is gradually reduced, the adaptability to the required layering thickness of the material with the broken rice rate content at the corresponding position is improved, and the material distributing plate 9 is used for separating the top and bottom layer materials moving past the edge of the material guide plate 8.

[0037] Specifically, one side part of the top of the material distributing plate 9 is located at the top of the corresponding side of the material guide plate 8, one side part of the bottom of the material distributing plate 9 is located at the bottom of the material guide plate 8, and the distance from the top part of the material distributing plate 9 to the material guide plate 8 is smaller than the thickness of the material layer formed on the top surface of the material distributing plate 9 conveyed by the inclined plate 7. When the material layer slides down along the inclined top surface of the material guide plate 8 and passes through the material distributing plate 9, the distance from the top layer material to the material guide plate 8 is greater than the distance from the top of the material distributing plate 9 to the material guide plate 8, so that the top layer material can pass over the top part of the material distributing plate 9 and fall down, while the bottom layer material falls from the bottom surface area of the top part of the material distributing plate 9, is intercepted by the side wall of the material distributing plate 9, and falls to the top surface of the bottom part of the material distributing plate 9, thereby completing the separation of the passing materials.

[0038] The bottom of the material distributing plate 9 is inclined towards the rotating descending side of the screen drum 2. One side of the frame 1 is provided with a swing mechanism for driving the material guide plate 8 to move reciprocally. Specifically, the moving plate 11 can move relative to the connecting seat 12 in the axial direction of the screen drum 2. The swing mechanism comprises a rotating disc 16, refer to Figure 7The rotating disk 16 is rotatably connected to the corresponding connecting seat 12 via a rotating shaft. An adjustment groove 14 is provided on one side of the moving plate 11 corresponding to the connecting seat 12. The extension direction of the adjustment groove 14 is adapted to the radial direction of the screen cylinder 2. A toggle member 15 is slidably sleeved on the inner side of the adjustment groove 14. The toggle member 15 can be set as a lever.

[0039] Preferably, the actuating element 15 is configured as a rolling bearing, the inner ring of which is fixedly connected to the rotating disk 16, and the outer ring of which is slidably sleeved with the adjusting groove 14. The extension length of the adjusting groove 14 is adapted to the range of rotation of the actuating element 15 around the axis of the rotating disk 16. A transmission mechanism 6 is provided on one side of the top of the frame 1. Specifically, the transmission mechanism 6 includes a first bevel gear 602 and two drive wheels 601. The first bevel gear 602 is rotatably connected to the frame 1 through a rotating shaft. The first bevel gear 602 is coaxially connected to the corresponding drive wheel 601 through the rotating shaft, so that the rotation of the drive wheel 601 can drive the corresponding first bevel gear 602 to rotate synchronously. One of the two drive shafts 3 is fixedly sleeved with the corresponding drive wheel 601. The two drive wheels 601 are connected by a transmission belt. The rotating disk 16 is coaxially connected to a second bevel gear 603 through a rotating shaft. The second bevel gear 603 meshes with the first bevel gear 602.

[0040] During operation, the feeding mechanism 10 conveys rice material into the screen cylinder 2. The reduction motor in the drive mechanism 13 drives the corresponding transmission wheel to rotate. The transmission wheel, in conjunction with the transmission belt, drives the corresponding drive shaft 3 to rotate synchronously. The drive shaft 3 drives the corresponding support wheel 4 to rotate. The support wheel 4 drives the screen cylinder 2 to rotate. The rotation of the screen cylinder 2 drives the material-turning plate 5 to rotate. The material-turning plate 5, in conjunction with the rotation of the screen cylinder 2, turns the material. As the material-turning plate 5 rotates from the bottom of the screen cylinder 2 to the top of the screen cylinder 2, it lifts up part of the material. As part of the material falls back on the rotating rising side of the screen cylinder 2 after being turned over, the rotation of the material-turning plate 5 drives part of the material to the top of the inclined plate 7. The material is distributed at an angle on the rotating rising side of the screen cylinder 2.

[0041] At this time, the material on the feeding plate 5 falls to the top of the inclined plate 7 under the action of gravity, and falls along the top surface of the inclined plate 7 to the top surface of the guide plate 8. During this process, the drive shaft 3 corresponding to the drive wheel 601 rotates, driving the drive wheel 601 to rotate. The drive wheel 601 drives the drive wheel 601 corresponding to the first bevel gear 602 to rotate through the transmission belt. The drive wheel 601 drives the first bevel gear 602 to rotate. The first bevel gear 602 drives the second bevel gear 603 to rotate. The second bevel gear 603 drives the rotating disk 16 to rotate through the rotating shaft transmission, thereby driving the actuating element 15 to rotate around the axis of the rotating disk 16. During the rotation of the actuating element 15, the outer ring of the rolling bearing abuts against the outer wall of the adjusting groove 14. While moving back and forth along the adjusting groove 14 in the radial direction of the screen cylinder 2, the transmission drives the moving plate 11 to move back and forth in the axial direction of the screen cylinder 2, thereby driving the guide plate 8 to move back and forth horizontally.

[0042] The reciprocating movement of the guide plate 8 creates vibration, causing the top rice material to slide down the guide plate 8 towards the distribution plate 9. Under the vibration, broken rice moves more easily to the bottom of the material layer. As the material slides closer to the distribution plate 9, more broken rice is distributed at the bottom of the material layer, actively separating the broken rice without tumbling or convection. Then, as the material passes the top part of the distribution plate 9, the top part containing more whole rice crosses the top surface of the distribution plate 9 and falls back to the rotating upward side of the screen cylinder 2. Meanwhile, the bottom part containing more broken rice falls down the guide plate 8 to the top surface of the bottom part of the distribution plate 9 and slides down the rotating downward side of the screen cylinder 2. The closer to the discharge end of the screen cylinder 2, the less broken rice there is. The thickness of the material layer separated by the distribution plate 9 is reduced due to the decrease in distance to the guide plate 8.

[0043] The material layer after active separation is separated by the distribution plate 9, and the material with a higher broken rice ratio is guided to the side of the screen cylinder 2 with less material distribution. This prevents the broken rice from being wrapped by whole rice during separation and tumbling convection. At the same time, this part of the broken rice can directly contact the inner wall of the screen cylinder 2. On the one hand, it increases the overall contact area between the material in the screen cylinder 2 and the screen cylinder 2. On the other hand, the broken rice that has been actively separated is separated by the downward rotation of the screen cylinder 2, which improves the contact efficiency between the broken rice and the screen cylinder 2, thereby improving the overall screening efficiency.

[0044] Example 2, as Figures 1-5Based on Embodiment 1, a number of connecting rods 18 are fixedly connected to the top of the material distribution plate 9. The connecting rods 18 are slidably sleeved with the connecting frame 17 and are arranged at even intervals along the axial direction of the screen cylinder 2. A first push rod 25 is fixedly installed on the frame of the connecting frame 17. The first push rod 25 is an electric push rod and is arranged at the midpoint position corresponding to the axial direction of the screen cylinder 2. The output end of the first push rod 25 is fixedly connected to the corresponding connecting rod 18. A vision sensor 19 is fixedly installed on one side of the inclined plate 7. The number of vision sensors 19 is at least two. The inclined plate 7 spreads out the material and performs visual inspection in conjunction with the vision sensors 19.

[0045] The vision sensor 19 is used to detect the image information of rice grains on the top part of the inclined plate 7 and the guide plate 8 and feeds the result back to the PLC processor. The PLC processor calculates the broken rice rate R in the detection area based on the rice grain image collected by the vision sensor 19 and feeds the broken rice rate R back to the controller. The controller has a first preset threshold and a second preset threshold. The first preset threshold is the upper limit threshold used to determine that the broken rice rate in the current detection area is too high and triggers an increase in the material separation distance. The second preset threshold is the lower limit threshold used to determine that the broken rice rate in the current detection area is too low and triggers a decrease in the material separation distance. The first preset threshold is greater than the second preset threshold.

[0046] When the broken rice rate R is greater than or equal to the first preset threshold, the controller controls the first push rod 25 to move in the direction that moves the material distribution plate 9 away from the guide plate 8, so as to increase the material distribution distance and allow more bottom material with a high broken rice rate to be received by the material distribution plate 9 and guided to the rotating and descending side of the screen cylinder 2 for screening; when the broken rice rate R is less than or equal to the second preset threshold, the controller controls the first push rod 25 to move in the opposite direction, so as to reduce the material distribution distance and reduce the excessive separation of whole rice grains; when the broken rice rate R is between the second preset threshold and the first preset threshold, the controller maintains the current extension and retraction state of the first push rod 25 to avoid the first push rod 25 from moving frequently when the broken rice rate fluctuates at the critical point. The material distribution distance is the distance between the top part of the material distribution plate 9 and the guide plate 8.

[0047] During the actual detection, the inclined plate 7 spreads out the rice material lifted by the feeding plate 5, allowing the vision sensor 19 to acquire images of the exposed rice grains on the surface of the inclined plate 7 or the feeding plate 8. The vision sensor 19 continuously acquires multiple frames of images during the reciprocating movement of the feeding plate 8. The PLC processor performs grayscale conversion, filtering, and edge extraction on the multiple frames of images, and extracts the contour information of each rice grain in the image. For grains with partial occlusion or overlap, the average recognition result of multiple frames can be used as the broken rice rate result for that detection area to reduce the impact of single-frame image errors on the adjustment of the feeding plate 9.

[0048] The PLC processor uses the sum of the projected areas of all identifiable rice grains within the detection area as the total rice grain area, and the sum of the projected areas of grains identified as broken rice as the broken rice area, to calculate the broken rice rate R: R = broken rice area / total rice grain area. Alternatively, the ratio of the number of broken rice grains to the total number of grains can be used as the broken rice rate R. The controller controls the stroke of push rod 25 based on the broken rice rate R, creating a separation distance between the material distribution plate 9 and the guide plate 8 that matches the current broken rice rate. A higher broken rice rate R results in a larger separation distance, guiding more material with a high broken rice rate from the bottom layer to the rotating, descending side of the screen cylinder 2; a lower broken rice rate R results in a smaller separation distance, reducing the excessive separation of whole rice grains.

[0049] Thus, the vision sensor 19, PLC processor, controller, push rod 25, connecting rod 18 and material distribution plate 9 form a closed-loop adjustment process based on the broken rice rate detection result, so that the material distribution spacing of the material distribution plate 9 can be adjusted according to the broken rice rate changes at different axial positions or at different times.

[0050] Example 3, as Figures 2-5 and Figure 8 Based on Embodiment 2, a movable rod 24 is slidably arranged on one side of the connecting frame 17. A rack 22 is fixedly connected to the rod body of the movable rod 24. Several adjusting shafts 21 are rotatably arranged on the side of the connecting frame 17 near the guide plate 8. The axial direction of the adjusting shaft 21 is adapted to the normal direction of the top surface of the guide plate 8. A gear 23 is fixedly sleeved at the end of the adjusting shaft 21. An adjusting plate 20 is fixedly connected to the bottom end of the adjusting shaft 21. The bottom surface of the adjusting plate 20 is adapted to the top surface of the guide plate 8. The adjusting plate 20 adjusts the amount of material moving in the axial direction of the top of the guide plate 8 in the screen cylinder 2. The number of racks 22 is adapted to the number of adjusting shafts 21. The racks 22 mesh with the corresponding gears 23. A second push rod 26 is fixedly arranged on the side of the connecting frame 17 near the guide plate 8. The second push rod 26 is an electric push rod and its output end is fixedly connected to the movable rod 24. It is used to drive the movable rod 24 to move in the axial direction of the screen cylinder 2. The feeding mechanism 10 is a spiral quantitative feeding device.

[0051] During the screening of rice material in the screen cylinder 2, near the discharge end of the screen cylinder 2, the corresponding part of the material inside the screen cylinder 2 is whole rice. At this time, the material on the guide plate 8 is whole rice, and there is still space between the corresponding material distribution plate 9 and the guide plate 8. When the monitoring result of the broken rice rate near the discharge end of the screen cylinder 2 by the vision sensor 19 is less than the rated value, the controller controls the second push rod 26 to extend. The second push rod 26 drives the rack 22 to move. The movement of the rack 22 drives the corresponding gear 23 to rotate. The gear 23 drives the corresponding adjusting shaft 21 to rotate. The adjusting shaft 21 drives the adjusting plate 20 to rotate, so that the adjusting plate 20 is tilted towards the discharge end of the screen cylinder 2, guiding the material on the top of the guide plate 8 to the rear end of the screen cylinder 2.

[0052] A portion of the actively separated rice material falls to the rear end of the screen cylinder 2 under the guidance of the separating plate 9 and is directly screened. At the same time, the feeding mechanism 10 increases the feed rate per unit time, so that the rear end of the screen cylinder 2 can be fully utilized, ensuring the overall screening efficiency. This also allows the screening device to adapt to the screening operation of materials with fluctuating broken rice content. For example, when screening materials with low broken rice content, the material at the rear end of the screen cylinder 2 does not contain broken rice after screening. At this time, the feed rate is increased and a portion of the actively separated broken rice is guided to the rear rotating and descending side for indirect screening. When the broken rice content of the material is high, the adjusting plate 20 is reset and the feed rate is reduced to ensure the screening quality.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A broken rice screening device for rice production, comprising a frame (1) and a sieve cylinder (2), wherein the sieve cylinder (2) is arranged at an incline, and two drive shafts (3) with parallel axes are rotatably arranged on the top of the frame (1), wherein support wheels (4) are fixedly sleeved on the shafts at both ends of the drive shafts (3), characterized in that, The inner wall of the screen drum (2) is fixedly connected with a plurality of material shifting plates (5), the top of the frame (1) is fixedly connected with a connecting frame (17), the top of the part of the connecting frame (17) located inside the screen drum (2) is fixedly connected with an inclined plate (7), a material guiding plate (8) is arranged inside the screen drum (2), and a material distributing plate (9) is arranged at the bottom of the connecting frame (17); A swing mechanism for driving the material guiding plate (8) to move reciprocally is arranged on one side of the frame (1). The swing mechanism can drive the material guiding plate (8) to move reciprocally along the axial direction of the screen drum (2). The material shifting plates (5) are used to cooperate with the rotation of the screen drum (2) to lift the rice material onto the inclined plate (7). Among the material that falls onto the material distributing plate (9) through the inclined plate (7), the top layer of material passes over the material distributing plate (9) and falls to the rotating rising side of the screen drum (2), and the material distributing plate (9) separates the material located at the bottom layer and guides the material to the rotating falling side of the screen drum (2).

2. The broken rice screening device for rice production according to claim 1, characterized in that, The inclined plate (7) is arranged in an inclined manner, both sides of the screen drum (2) are provided with limiting grooves, a driving mechanism (13) is arranged on one side of the top of the frame (1), and a feeding mechanism (10) is fixedly arranged on one side of the top of the frame (1).

3. The broken rice screening device for rice production according to claim 1, characterized in that, The cross section of each material shifting plate (5) is in a broken line shape, and the plurality of material shifting plates (5) are annularly arranged in a uniformly spaced manner. The material guiding plate (8) is located at the bottom of the inclined plate (7) and is arranged in an inclined manner. The cross section of the material distributing plate (9) is in a "C" shape with both the top and bottom arranged in an inclined manner. The plate surface of the top part of the material distributing plate (9) is arranged in an inclined manner in the radial direction of the screen drum (2), and the distance between the top part of the material distributing plate (9) and the top surface of the material guiding plate (8) gradually decreases along the direction in which the axis of the screen drum (2) descends.

4. The broken rice screening device for rice production according to claim 2, characterized in that, Connecting seats (12) are fixedly arranged on both sides of the top of the frame (1), the top of each connecting seat (12) is slidably connected with a moving plate (11), the material guiding plate (8) is fixedly connected with the moving plate (11), the swing mechanism comprises a rotating disc (16), one side of the moving plate (11) corresponding to the connecting seat (12) is provided with an adjusting groove (14), a shifting member (15) is slidably sleeved inside the adjusting groove (14), and a transmission mechanism (6) is arranged on one side of the top of the frame (1).

5. The broken rice screening device for rice production according to claim 4, characterized in that, The rotating disc (16) is rotatably connected with the corresponding connecting seat (12) through a rotating shaft, the extending direction of the adjusting groove (14) is adapted to the radial direction of the screen drum (2), the shifting member (15) is configured as a rolling bearing, the inner ring of the rolling bearing is fixedly connected with the rotating disc (16), the outer ring of the rolling bearing is slidably sleeved with the adjusting groove (14), and the extending length of the adjusting groove (14) is adapted to the rotation range of the shifting member (15) around the axis of the rotating disc (16).

6. The broken rice screening device for rice production according to claim 4, characterized in that, The transmission mechanism (6) includes a first bevel gear (602) and two drive wheels (601). The first bevel gear (602) is rotatably connected to the frame (1) via a rotating shaft. The first bevel gear (602) is coaxially connected to the corresponding drive wheel (601) via a rotating shaft. One of the two drive shafts (3) is fixedly sleeved with the corresponding drive wheel (601). The two drive wheels (601) are connected by a transmission belt. The rotating disk (16) is coaxially connected to a second bevel gear (603) via a rotating shaft. The second bevel gear (603) meshes with the first bevel gear (602).

7. The broken rice screening device for rice production according to claim 4, characterized in that, The top of the material distribution plate (9) is fixedly connected with several connecting rods (18). The connecting rods (18) are slidably sleeved with the connecting frame (17). The frame of the connecting frame (17) is fixedly provided with a push rod (25). The output end of the push rod (25) is fixedly connected with the corresponding connecting rod (18). A vision sensor (19) is fixedly provided on one side of the inclined plate (7). The number of vision sensors (19) is at least two. The vision sensor (19) is used to collect images of rice grains in a preset detection area on the inclined plate (7) or the guide plate (8). The processor calculates the broken rice rate based on the rice grain images. The controller controls the push rod (25) to move based on the broken rice rate to adjust the material distribution distance between the material distribution plate (9) and the guide plate (8).

8. The broken rice screening device for rice production according to claim 7, characterized in that, A movable rod (24) is slidably provided on one side of the connecting frame (17). A rack (22) is fixedly connected to the rod body of the movable rod (24). Several adjusting shafts (21) are rotatably provided on the side of the connecting frame (17) near the guide plate (8). A gear (23) is fixedly sleeved at the end of the adjusting shaft (21). An adjusting plate (20) is fixedly connected to the bottom end of the adjusting shaft (21). The adjusting plate (20) adjusts the amount of material at the top of the guide plate (8) moving in the axial direction of the screen cylinder (2). A second push rod (26) is fixedly provided on the side of the connecting frame (17) near the guide plate (8).

9. A broken rice screening device for rice production according to claim 8, characterized in that, The axial direction of the adjusting shaft (21) is adapted to the normal direction of the top surface of the guide plate (8), the bottom surface of the adjusting plate (20) is adapted to the top surface of the guide plate (8), the number of racks (22) is adapted to the number of adjusting shafts (21), the racks (22) mesh with the corresponding gears (23), and the output end of the second push rod (26) is fixedly connected to the moving rod (24).

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