Anti-blocking classifying screen device and method

Abstract

The invention discloses an anti-blocking classifying screen device and method, and particularly relates to the field of rice screening equipment.The anti-blocking classifying screen device comprises a screening tank, an impurity removal assembly is arranged at the top end of the screening tank, the impurity removal assembly comprises an impurity removal tank and an air blower, and the impurity removal tank is installed at the top end of the screening tank through fixing bolts; an impurity removal screen is installed at the lower position in the impurity removal tank through bolts, and a guide plate matched with the impurity removal screen is fixedly connected to the position, located below the impurity removal screen, in the screening tank; in the rice screening process, rice can be prevented from being too humid and adhering, so that the blocking probability of the rice is reduced, meanwhile, the situation that the surface of the rice is too humid and contaminated with much dust can be prevented, the processing efficiency is improved, blocking caused by too fast discharging or concentrated discharging is reduced, and the use effect is conveniently improved; the rice subjected to impurity removal can be classified and screened according to the particle size, and subsequent production and preparation are facilitated.

Description

Technical Field

[0001] The invention relates to the field of rice screening equipment, and in particular to an anti-blocking grading screen device and method. Background Art

[0002] Rice, also called rice, is a food made from rice grains after processes such as cleaning, husking, milling, and finished product sorting. In the processing of rice, due to factors such as the quality of rice grains and the crushing and breaking conditions during husking, there may be many small stones, dust, broken rice, etc. in it. If they are not cleaned up during the processing of rice, it will not only affect production safety and reduce the quality of rice, but also be harmful to people's health. At the same time, the particle specifications of rice produced uniformly are inconsistent, so grading and screening equipment is usually used in the rice processing process to screen and grade.

[0003] In the process of screening rice, the existing anti-clogging grading screen device usually needs to use multiple screens to remove impurities, which reduces the processing efficiency. In the process of processing, the rice may be too moist when stored, which may easily cause it to stick together and cause blockage, which may interfere with the screening. When the rice is screened, the feed is fed through the feed port, and it is difficult to control the feed amount. When the amount of rice fed in a short period of time is large, it is easy to cause blockage. At the same time, the rice falls in a concentrated manner, which may affect the screening effect. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-clogging grading screen device and method, which solves the technical problems in the background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An anti-clogging grading screen device comprises a screening tank, a top of which is provided with a debris removal component, the debris removal component comprises a debris removal tank and a blower, and the debris removal tank is mounted on the top of the screening tank by fixing bolts;

[0007] A de-impurity screen is installed at the lower position of the interior of the de-impurity tank by bolts, and a guide plate matching the de-impurity screen is fixedly connected to the interior of the screening tank and located below the de-impurity screen, a shunt discharge pipe is fixedly installed through the top of the de-impurity tank, a feeding pipe is fixedly connected to the outer ring of the shunt discharge pipe at the rear and near the top position, a feeding auger is rotatably installed inside the feeding pipe through a rotating rod, a feeding motor is installed at one end of the feeding pipe away from the shunt discharge pipe, and a driving shaft of the feeding motor is connected to the rotating rod of the feeding auger, a feeding pipe is provided at the rear position of the top of the feeding pipe, and a feeding solenoid valve is provided at the upper position of the outer ring of the feeding pipe, a de-impurity motor is installed at the top of the shunt discharge pipe, the driving shaft of the de-impurity motor passes through the top of the shunt discharge pipe and is fixedly connected to a connecting rod, and a movable frame is installed at the end of the connecting rod through connecting bolts, and an anti-blocking scraper is installed at the bottom end of the movable frame through bolts, and the bottom surface of the anti-blocking scraper is in contact with the top surface of the de-impurity screen.

[0008] As a further solution of the present invention, a blower is installed at a position close to one side of the screening tank through a support frame, and an air heater is installed at the top of the blower through an air pipe 1, the top of the air heater is connected to a filter through an air pipe 2, a hot air distributor is installed at a center position through the top of the impurity removal tank, and the air inlet of the hot air distributor is connected to the air outlet of the filter through an air pipe.

[0009] As a further solution of the present invention, the outer ring of the material conveying pipe is provided with a heating sleeve, an air conveying pipe is provided at the top end penetrating the gas conveying pipe, and one end of the air conveying pipe away from the gas conveying pipe is connected to the heating sleeve.

[0010] As a further solution of the present invention, a plurality of diverter pipes are arranged at one end of the diverter discharge pipe extending into the impurity removal tank, bearings are arranged at the connection between the driving shaft and connecting rod of the impurity removal motor and the diverter discharge pipe, and the diverter discharge pipe is rotatably connected to the driving shaft and connecting rod of the impurity removal motor through the bearings.

[0011] As a further solution of the present invention, a cyclone dust collector is installed at the rear of the screening tank, and the cyclone dust collector is connected to the impurity removal tank through a connecting pipe, a blowing pipe is arranged on one side of the screening tank, the guide plate is inclined, and the side close to the blowing pipe is tilted, and a slag discharge port is arranged on the side of the guide plate away from the blowing pipe.

[0012] As a further solution of the present invention, a lower hopper is installed inside the screening tank and below the guide plate, and a grading screening cylinder is rotatably installed at the bottom of the screening tank through a mounting frame, a screening motor is installed at the front end of the screening tank, and the driving shaft of the screening motor is connected to the grading screening cylinder, and a feeding port of the grading screening cylinder matching each other is fixedly connected at the rear position inside the screening tank, a material drawing funnel is connected to the top of the material drawing funnel, and the collecting port of the material drawing funnel is adaptively matched with the discharge port of the lower hopper.

[0013] As a further scheme of the present invention, baffles are fixedly connected to the interior of the screening tank and at the front and rear ends of the top of the lower hopper, a blowpipe is provided on one side of the screening tank, and an impurity removal jet outlet is provided at one end of the blowpipe extending into the screening tank, an impurity guide frame is provided on the side of the screening tank away from the blowpipe, and a slag discharge port 2 is provided on the side of the guide frame away from the screening tank, and slag discharge port 2 and slag discharge port 1 are both provided with slag discharge solenoid valves at their bottom ends.

[0014] As a further scheme of the present invention, the grading screening cylinder is composed of several screens of different screening sizes from small to large, and a guide block is arranged under each screen, the bottom end of the guide block is connected with a discharge pipe, and a discharge solenoid valve is arranged at the lower position of the outer ring of the discharge pipe, a pushing motor is installed at the rear end of the screening tank, and the driving shaft of the pushing motor passes through the rear end of the screening tank and is fixedly connected with a pushing auger, the pushing auger is located inside the grading screening cylinder, and the outer ring of the pushing auger is in contact with the inner wall of the grading screening cylinder.

[0015] Beneficial effects of the present invention:

[0016] 1. The blower, air heater, air pipe, heating sleeve, screening tank, impurity removal tank and feed pipe are arranged to heat and dry the screened rice, prevent the rice from being too wet and sticky, thereby reducing the probability of blockage, and prevent the rice surface from being too wet and contaminated with too much dust;

[0017] 2. Through the cooperation of the impurity removal screen, cyclone dust collector, air jet pipe, slag discharge port 1 and slag discharge port 2, various small impurities such as pebbles, dust, broken rice, etc. in the rice can be filtered out to improve the purity of the rice and the quality of rice production. The impurities are discharged through the slag discharge port 1 and slag discharge port 2 for centralized treatment, which is convenient for personnel to collect the broken rice later.

[0018] 3. During use, the split discharge pipe, feed pipe and feed auger are used to control the amount of rice feed. At the same time, the feed is dispersed during feeding, which further reduces the blockage caused by feeding too fast or concentrated, and improves the use effect.

[0019] 4. Through the cooperation of the feeding port, grading and screening cylinder, pushing motor and pushing auger, the rice after impurities removal can be graded and screened according to the particle size, which is convenient for subsequent production and preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of an anti-clogging grading screen device of the present invention;

[0021] Figure 2 This is a front view of the overall structure of an anti-clogging grading screen device of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of a debris removal tank in an anti-clogging grading screen device of the present invention;

[0023] Figure 4 A top view of an anti-blocking scraper in an anti-blocking grading screen device of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of a feed pipe in an anti-clogging grading screen device of the present invention;

[0025] Figure 6 It is a schematic diagram of the connection between the grading screening cylinder and the feed inlet in an anti-clogging grading screen device of the present invention;

[0026] Figure 7 The present invention is a cross-sectional view of the internal structure of a feed port in an anti-clogging grading screen device.

[0027] In the figure: 1. screening tank; 2. impurity removal tank; 3. impurity removal screen; 4. guide plate; 5. slag outlet one; 6. diversion discharge pipe; 7. conveying pipe; 8. feeding pipe; 9. feeding motor; 10. feeding auger; 11. heating sleeve; 12. impurity removal motor; 13. anti-blocking scraper; 14. impurity removal component; 15. cyclone dust collector; 16. blower; 17. air heater; 18. filter; 19. hot air distributor; 20. air conveying pipe; 21. blowing pipe; 22. baffle; 23. slag outlet two; 24. air spray pipe; 25. graded screening cylinder; 26. feeding port; 27. material guide funnel; 28. discharge hopper; 29. ​​guide block; 30. discharge pipe; 31. screening motor; 32. pushing motor; 33. pushing auger. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1-Figure 7 As shown, an anti-clogging grading screen device includes a screening tank 1, a top of the screening tank 1 is provided with a debris removal component 14, the debris removal component 14 includes a debris removal tank 2 and a blower 16, and the debris removal tank 2 is installed on the top of the screening tank 1 by fixing bolts;

[0030] A cleaning screen 3 is bolted to the lower part of the cleaning tank 2, a guide plate 4 matching the cleaning screen 3 is fixedly connected to the inside of the screening tank 1 and located below the cleaning screen 3, a shunt discharge pipe 6 is fixedly installed on the top of the cleaning tank 2, a feed pipe 7 is fixedly connected to the outer circle of the shunt discharge pipe 6 at the rear and near the top, a feed auger 10 is rotatably installed inside the feed pipe 7 through a rotating rod, a feed motor 9 is installed at the end of the feed pipe 7 away from the shunt discharge pipe 6, and the feed motor 9 is rotated to rotate. The driving shaft is connected to the rotating rod of the feed auger 10, a feed pipe 8 is arranged at the rear position of the top end of the conveying pipe 7, and a feed solenoid valve is arranged at the upper position of the outer ring of the feed pipe 8, and a dust removal motor 12 is installed at the top end of the diverter and discharge pipe 6, and the driving shaft of the dust removal motor 12 passes through the top end of the diverter and discharge pipe 6 and is fixedly connected with a connecting rod, and a movable frame is installed at the end of the connecting rod through connecting bolts, and an anti-blocking scraper 13 is installed at the bottom end of the movable frame through bolts, and the bottom surface of the anti-blocking scraper 13 is in contact with the top surface of the dust removal screen 3.

[0031] The blower 16 is installed at a position close to one side of the screening tank 1 through a support frame, and an air heater 17 is installed at the top of the blower 16 through an air pipe 1, and a filter 18 is connected to the top of the air heater 17 through an air pipe 2. A hot air distributor 19 is installed at the center of the top of the impurity removal tank 2, and the air inlet of the hot air distributor 19 is connected to the air outlet of the filter 18 through an air pipe.

[0032] The hot air generated by the hot air distributor 19 is used to dry the rice to prevent it from being too wet and to prevent the rice from being too wet and sticking together to cause blockage.

[0033] The outer ring of the material conveying pipe 7 is provided with a heating sleeve 11 , and an air conveying pipe 20 is provided at the top end penetrating the air conveying pipe, and one end of the air conveying pipe 20 away from the air conveying pipe is connected to the heating sleeve 11 .

[0034] The hot air is conveyed to the heating sleeve 11 through the air conveying pipe 20 to preheat the rice that has not fallen out of the conveying pipe 7, so as to increase its initial temperature and improve the drying efficiency.

[0035] A plurality of shunt pipes are arranged at one end of the shunt discharge pipe 6 extending into the impurity removal tank 2. Bearings are arranged at the connection between the driving shaft and the connecting rod of the impurity removal motor 12 and the shunt discharge pipe 6. The shunt discharge pipe 6 is rotatably connected to the driving shaft and the connecting rod of the impurity removal motor 12 through the bearings.

[0036] The diversion pipe is set up to facilitate the dispersion of the material and prevent the rice from being too concentrated and causing accumulation.

[0037] A cyclone dust collector 15 is installed at the rear of the screening tank 1, and the cyclone dust collector 15 is connected to the impurity removal tank 2 through a connecting pipe. A blowing pipe 21 is arranged on one side of the screening tank 1. The guide plate 4 is inclined, and the side close to the blowing pipe 21 is tilted. A slag discharge port 5 is arranged on the side of the guide plate 4 away from the blowing pipe 21.

[0038] The cyclone dust collector 15 facilitates the processing of dust, and the blowing pipe 21 facilitates the blowing of impurities on the guide plate 4 so as to be discharged through the slag discharge port 5.

[0039] A lower hopper 28 is installed inside the screening tank 1 and below the guide plate 4, and a grading screening cylinder 25 is rotatably installed at the bottom of the screening tank 1 through a mounting frame, a screening motor 31 is installed at the front end of the screening tank 1, and the driving shaft of the screening motor 31 is connected to the grading screening cylinder 25, and a feed port 26 matching the grading screening cylinder 25 is fixedly connected to the rear position of the inside of the screening tank 1, and a feed hopper 27 is connected to the top of the feed port 26, and the collecting port of the feed hopper 27 is adaptively matched with the discharge port of the lower hopper 28.

[0040] The material guiding funnel 27 is provided to facilitate the collection and guidance of the rice so as to facilitate the subsequent screening and processing.

[0041] Baffles 22 are fixedly connected to the interior of the screening tank 1 and at the front and rear ends of the top of the lower hopper 28. A blowpipe 24 is provided on one side of the screening tank 1, and an impurity removal jet port is provided at one end of the blowpipe 24 extending into the screening tank 1. An impurity guide frame is provided on the side of the screening tank 1 away from the blowpipe 24, and a slag discharge port 23 is provided on the side of the guide frame away from the screening tank 1. Slag discharge solenoid valves are provided at the bottom ends of the slag discharge port 23 and the slag discharge port 1 5.

[0042] When the rice falls into the lower hopper 28 by gravity, the air jet pipe 24 can continue to spray air to blow the smaller debris inside and the rice husk that may remain to the second slag discharge port 23, thereby playing a role of secondary impurity removal.

[0043] The grading screening cylinder 25 is composed of several screens of different screening sizes from small to large, and a guide block 29 is arranged under each screen, the bottom end of the guide block 29 is connected with a discharge pipe 30, and a discharge solenoid valve is arranged at the lower position of the outer circle of the discharge pipe 30, a pushing motor 32 is installed at the rear end of the screening tank 1, and the driving shaft of the pushing motor 32 passes through the rear end of the screening tank 1 and is fixedly connected with a pushing auger 33, the pushing auger 33 is located inside the grading screening cylinder 25, and the outer circle of the pushing auger 33 is in contact with the inner wall of the grading screening cylinder 25.

[0044] By driving the shaft of the pushing motor 32 to rotate, the pushing auger 33 can be driven to continuously push the rice into the grading and screening cylinder 25, and the grading and screening cylinder 25 is composed of multiple screens of different sizes. When the rice is pushed and transported by the pushing auger 33, the rice will fall in sequence according to its size to achieve the effect of grading and screening.

[0045] It should be noted that when the present invention is used, the feed pipe 8 can be first connected to the external material conveying pipeline, and the blowing pipe 21 and the spray pipe 24 can be connected to the external impurity removal air pump, and the blower 16 and the air heater 17 can be started as needed, and then the feed solenoid valve at the feed pipe 8 can be opened, and the feed motor 9 can be started intermittently, so that the rice can be quantitatively added to the interior of the impurity removal tank 2;

[0046] Before and after the rice enters, the hot air generated by the hot air distributor 19 is used to dry the rice to prevent it from being too wet. At the same time, the hot air is transported to the heating sleeve 11 through the air delivery pipe 20 to preheat the rice that has not fallen out of the feed pipe 7, so as to increase its initial temperature and improve the drying efficiency.

[0047] After that, the rice falls onto the impurity removal screen 3 for the first screening. During the screening, the cyclone dust collector 15 can be started to remove the dust. After that, after being screened by the impurity removal screen 3, most of the small particles such as tiny stones and broken rice will pass through the impurity removal screen 3 and fall onto the guide plate 4. They are then discharged toward the slag discharge port 5 through the guidance of the guide plate 4 and the air spray of the blowing pipe 21.

[0048] When the rice falls into the lower hopper 28 by gravity, the air jet pipe 24 can continue to spray air, and the smaller debris and the rice husks that may remain inside can be blown to the second slag discharge port 23, thereby playing a role of secondary impurity removal;

[0049] When the rice enters the feed inlet 26 through the lower hopper 28 and the guide funnel 27, the push motor 32 and the screening motor 31 can be started, and the solenoid valve at the discharge pipe 30 can be opened. The push motor 32 drives the shaft to rotate, which can drive the push auger 33 to continuously push the rice into the grading and screening cylinder 25.

[0050] The screening motor 31 drives the shaft to rotate, which can drive the grading screening drum 25 to rotate. The grading screening drum 25 is composed of multiple screens of different sizes. When the rice is pushed and transported by the pushing auger 33, the rice will fall in sequence according to its size to achieve the effect of grading and screening.

[0051] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An anti-clogging grading screen device, comprising a screening tank (1), wherein a de-impurity assembly (14) is arranged at the top of the screening tank (1), characterized in that: The impurity removal assembly (14) comprises an impurity removal tank (2) and a blower (16); the impurity removal tank (2) is mounted on the top of the screening tank (1) by means of fixing bolts; A cleaning screen (3) is bolted to the lower part of the interior of the cleaning tank (2); a guide plate (4) matching the cleaning screen (3) is fixedly connected to the interior of the screening tank (1) and located below the cleaning screen (3); a diversion discharge pipe (6) is fixedly installed at the top of the cleaning tank (2); a feed pipe (7) is fixedly connected to the outer ring of the diversion discharge pipe (6) at the rear and near the top; a feed auger (10) is rotatably installed inside the feed pipe (7) via a rotating rod; a feed motor (9) is installed at the end of the feed pipe (7) away from the diversion discharge pipe (6), and a feed screw (10) is installed at the end of the feed pipe (7) away from the diversion discharge pipe (6). The driving shaft of the feeding motor (9) is connected to the rotating rod of the feeding auger (10); a feeding pipe (8) is arranged at the rear position of the top end of the feeding pipe (7), and a feeding solenoid valve is arranged at the upper position of the outer ring of the feeding pipe (8); a cleaning motor (12) is installed at the top end of the diversion discharge pipe (6); the driving shaft of the cleaning motor (12) passes through the top end of the diversion discharge pipe (6) and is fixedly connected with a connecting rod, and a movable frame is installed at the end of the connecting rod through connecting bolts, and an anti-blocking scraper (13) is installed at the bottom end of the movable frame through bolts, and the bottom surface of the anti-blocking scraper (13) is in contact with the top surface of the cleaning screen (3).

2. The anti-clogging grading screen device according to claim 1, characterized in that: The blower (16) is installed at a position close to one side of the screening tank (1) through a support frame, and an air heater (17) is installed at the top of the blower (16) through an air supply pipe 1, and the top of the air heater (17) is connected to a filter (18) through an air supply pipe 2. A hot air distributor (19) is installed at a central position at the top of the impurity removal tank (2), and the air inlet of the hot air distributor (19) is connected to the air outlet of the filter (18) through an air supply pipe.

3. The anti-clogging grading screen device according to claim 2, characterized in that: The outer ring of the material conveying pipe (7) is provided with a heating sleeve (11), and an air conveying pipe (20) is provided through the top end of the air conveying pipe, and the end of the air conveying pipe (20) away from the air conveying pipe is connected to the heating sleeve (11).

4. The anti-clogging grading screen device according to claim 1, characterized in that: A plurality of shunt pipes are arranged at one end of the shunt discharge pipe (6) extending into the impurity removal tank (2), and bearings are arranged at the connection points between the driving shaft and the connecting rod of the impurity removal motor (12) and the shunt discharge pipe (6), and the shunt discharge pipe (6) is rotatably connected to the driving shaft and the connecting rod of the impurity removal motor (12) via the bearings.

5. The anti-clogging grading screen device according to claim 1, characterized in that: A cyclone dust collector (15) is installed at the rear of the screening tank (1), and the cyclone dust collector (15) is connected to the impurity removal tank (2) through a connecting pipe. A blowing pipe (21) is provided on one side of the screening tank (1). The guide plate (4) is inclined and tilted on the side close to the blowing pipe (21). A slag discharge port (5) is provided on the side of the guide plate (4) away from the blowing pipe (21).

6. The anti-clogging grading screen device according to claim 5, characterized in that: A lower hopper (28) is installed inside the screening tank (1) and below the guide plate (4), and a grading screening cylinder (25) is rotatably installed at the bottom of the screening tank (1) through a mounting frame. A screening motor (31) is installed at the front end of the screening tank (1), and the drive shaft of the screening motor (31) is connected to the grading screening cylinder (25). A feed inlet (26) matching the grading screening cylinder (25) is fixedly connected to the rear position of the inside of the screening tank (1), and a feed inlet (26) is connected to the top of the feed inlet (26), and the collection port of the feed inlet funnel (27) is adaptively matched with the discharge port of the lower hopper (28).

7. The anti-clogging grading screen device according to claim 6, characterized in that: A baffle (22) is fixedly connected inside the screening tank (1) and at the front and rear ends of the top end of the lower hopper (28); a blowpipe (24) is provided on one side of the screening tank (1); and an impurity removal jet port is provided at one end of the blowpipe (24) extending into the screening tank (1); an impurity guide frame is provided on the side of the screening tank (1) away from the blowpipe (24); and a slag discharge port 2 (23) is provided on the side of the guide frame away from the screening tank (1); and slag discharge solenoid valves are provided at the bottom ends of the slag discharge port 2 (23) and the slag discharge port 1 (5).

8. The anti-clogging grading screen device according to claim 6, characterized in that: The grading screening cylinder (25) is composed of a plurality of screens of different screening sizes from small to large, and a guide block (29) is arranged below each screen, the bottom end of the guide block (29) is connected to a discharge pipe (30), and a discharge solenoid valve is arranged at the lower position of the outer ring of the discharge pipe (30), a pusher motor (32) is installed at the rear end of the screening tank (1), and the drive shaft of the pusher motor (32) passes through the rear end of the screening tank (1) and is fixedly connected to a pusher auger (33), the pusher auger (33) is located inside the grading screening cylinder (25), and the outer ring of the pusher auger (33) is in contact with the inner wall of the grading screening cylinder (25).

9. A method for preventing clogging of a grading screen device according to any one of claims 1 to 8, characterized in that: The method of use specifically includes the following steps: Step 1: First, the feed pipe (8) can be connected to the external material conveying pipeline, and the blowing pipe (21) and the air jet pipe (24) can be connected to the external impurity removal air pump, and the blower (16) and the air heater (17) can be started as needed. Then, the feed solenoid valve at the feed pipe (8) can be opened, and the feed motor (9) can be started intermittently, so that the rice can be quantitatively added to the interior of the impurity removal tank (2). Before and after the rice enters, the hot air generated at the hot air distributor (19) is used to dry the rice to prevent it from being too wet. At the same time, the hot air is transported to the heating sleeve (11) through the air delivery pipe (20) to preheat the rice that has not fallen out of the feed pipe (7), so as to increase its initial temperature and improve the drying efficiency. Step 2: The rice then falls onto the impurity removal screen (3) for primary screening. During the screening, the cyclone dust collector (15) can be activated to remove dust. After being screened by the impurity removal screen (3), most of the tiny stones, broken rice and other small particles will pass through the impurity removal screen (3) and fall onto the guide plate (4). They will be discharged toward the first slag discharge port (5) through the guidance of the guide plate (4) and the air jet of the air blower (21). When the rice then falls into the lower hopper (28) by gravity, the air jet (24) can continue to spray air to blow the smaller debris and the rice husks that may remain inside toward the second slag discharge port (23), thereby achieving a secondary impurity removal effect. Step 3: When the rice enters the feed inlet (26) through the guidance of the lower hopper (28) and the guide funnel (27), the push motor (32) and the screening motor (31) can be started, and the solenoid valve at the discharge pipe (30) can be opened. The push motor (32) drives the shaft to rotate, which can drive the push auger (33) to continuously push the rice into the grading and screening cylinder (25). The screening motor (31) drives the shaft to rotate, which can drive the grading and screening cylinder (25) to rotate. The grading and screening cylinder (25) is composed of a plurality of screens of different sizes. When the rice is pushed and transported by the push auger (33), the rice will fall in sequence according to the size, so as to achieve the effect of grading and screening.

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