A grain fine screening equipment integrating anti-clogging net and self-cleaning

Abstract

This invention relates to an integrated anti-clogging and self-cleaning grain fine screening device, comprising a frame, a casing, a screen cylinder, a first drive assembly, a ball-bouncing assembly, and a second drive device. The screen cylinder is installed inside the casing, which is mounted on the frame. The first drive assembly drives the screen cylinder. Two sets of symmetrical ball-bouncing assemblies are symmetrically installed in a figure-eight shape above the screen cylinder, and the second drive device drives the ball-bouncing assemblies. An upper partition plate is provided inside the casing, and a lower partition plate is provided on the frame. Multiple upper and lower partition plates are equidistantly arranged along the axis of the screen cylinder, forming a compartment between adjacent lower partition plates. Each compartment contains multiple cleaning balls. Compared with the prior art, this invention has the advantages of the ball-bouncing assembly being able to reciprocate within a certain angle range, opening to receive the cleaning balls sliding down from above the screen cylinder, and closing to bounce the cleaning balls upwards towards the screen cylinder for active cleaning, thus solving the problem of poor cleaning effect in existing equipment.

Description

Technical Field

[0001] This invention relates to grain screening equipment, and more particularly to a fine grain screening equipment that integrates anti-clogging net and self-cleaning. Background Technology

[0002] Grain fine screening equipment is used to achieve fine grading of grain particles and efficient removal of impurities. A cylindrical screen is one type, which features screen drums with different aperture sizes arranged in sections along its axial direction. Driven by a drive mechanism, the screen drums rotate. The grain to be screened enters from the feed end of the drum and, under the centrifugal force generated by the drum's rotation and its own gravity, moves forward along the inner wall of the drum. During this process, grain particles of different sizes pass through the corresponding screen apertures, achieving multi-stage fine grading. Larger particles, straw, etc., are removed from the drum. When processing wet or dusty grains, the screen is prone to clogging and sticking. Wet grain particles adhere to the screen mesh due to their stickiness, while fine dust in the dusty grain fills the screen mesh pores. At the same time, fibrous impurities mixed in the grain will entangle on the screen surface, resulting in a significant reduction in screening efficiency and requiring frequent shutdowns to clean the screen. A cleaning ball or elastic brush string can be installed inside the screen. The cleaning ball rotates synchronously with the screen drum, continuously beating the screen mesh mesh wall to shake off the adhering substances inside and on the surface of the mesh, thus achieving preliminary screen cleaning.

[0003] Existing grain fine screening equipment that integrates anti-clogging nets and self-cleaning mechanisms, such as cylindrical screening machines that use cleaning balls for net cleaning, results in direct contact between the cleaning balls and the grain to be screened when the cleaning balls are placed inside the screen drum. On the one hand, the cleaning balls are easily buried by the grain and cannot effectively contact the screen mesh wall, leading to net cleaning failure. On the other hand, fibrous impurities in the grain are easily entangled on the cleaning balls or elastic brush strings, which not only fails to clean the screen but also aggravates screen clogging. A search revealed that patent publication number CN 207430701 U discloses an automatic unclogging grading screen, specifically comprising: a cylindrical, horizontally placed outer shell; a screen drum coaxially arranged within the outer shell for grading materials; a drive device for rotating the screen drum; multiple feeding ports at the bottom of the outer shell for discharging materials of different coarseness; multiple unclogging balls inside the outer shell for striking the screen drum; the unclogging balls being suspended by ropes from fixed rings; the fixed rings being detachably mounted on a fixed plate located on the inner wall of the outer shell; and at least one vibrating rod along the axis of the screen drum, which, as the screen drum rotates, actuates the unclogging balls to strike the screen drum. However, this prior art relies on the screen drum rotating to passively actuate the vibrating rods to strike the unclogging balls, resulting in unstable unclogging performance.

[0004] In summary, the technical problem that needs to be solved is how to design a grain fine screening device with stable anti-clogging effect. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of unstable anti-clogging effect in the existing technology and to provide a grain fine screening device that integrates anti-clogging net and self-cleaning.

[0006] The objective of this invention can be achieved through the following technical solutions.

[0007] According to one aspect of the present invention, an integrated anti-clogging and self-cleaning grain fine screening device is provided, comprising a frame, a housing, a screen cylinder, a first drive assembly, a ball-bouncing assembly, and a second drive device; the screen cylinder is installed inside the housing, the housing is installed on the frame, the first drive assembly is connected to and rotates to drive the screen cylinder; two sets of symmetrical ball-bouncing assemblies are symmetrically installed in a figure-eight shape above the screen cylinder, and the second drive device is connected to and rotates to drive the ball-bouncing assemblies; The machine casing is provided with an upper partition plate, and the frame is provided with a lower partition plate. Multiple upper and lower partition plates are arranged equidistantly along the axis of the screen cylinder. Adjacent lower partition plates form a compartment. Each compartment is provided with multiple cleaning balls. The side of the compartment closest to the ground is provided with a discharge channel.

[0008] As a preferred technical solution, the ball-playing assembly includes a rotating rod, a ball-playing plate, and an end strip. One end of the rotating rod is connected to a second driving device, and the other end is connected to the ball-playing plate. The ball-playing plate extends along the axial direction of the screen cylinder, and the end strip is installed on one side of the ball-playing plate. An elastic limiting member is also fixed inside the housing. When the end strip contacts the elastic limiting member, the ball-playing plate rotates to its limit position.

[0009] As a preferred technical solution, the elastic limiting member includes a fixing strip, a spring, and an end piece. The fixing strip is installed on one side near the end strip, and the spring is installed on the other end of the spring. The end piece is in contact with the end strip.

[0010] As a preferred technical solution, the screen cylinder includes multiple screen sections with screen holes of different diameters, and the diameter of the screen holes on the screen sections gradually increases from the feed end to the discharge end.

[0011] As a preferred technical solution, there is a gap between the upper partition plate and the screen cylinder, and the gap width is smaller than the radius of the cleaning ball.

[0012] As a preferred technical solution, the first drive assembly includes a first motor, a gearbox, and a first transmission component. The first motor is mounted on the frame and its output shaft is connected to the input shaft of the gearbox. The output shaft of the gearbox is connected to the first transmission component, and the first transmission component is connected to the power input end of the screen cylinder.

[0013] As a preferred technical solution, the second drive assembly includes two meshing gears, a second transmission component is mounted on the gear shaft, and the second transmission component is connected to the rotating rod of the ball-playing assembly.

[0014] As a preferred technical solution, an incomplete gear is also meshed on the outer side of the gear, and the incomplete gear is connected to a second electric motor.

[0015] As a preferred technical solution, the device further includes a guide bar and a ball-blocking plate. The guide bar is installed on the ball-playing assembly and extends along the axial direction of the screen cylinder. The ball-blocking plate includes an arc plate and a straight plate. The straight plate is installed on the side of the arc plate away from the ground. The straight plate is connected to the inner side wall of the machine casing. The ball-playing assembly rotates within the space formed by the arc plate.

[0016] As a preferred technical solution, one end of the screen cylinder is provided with an intercepting roller and a conveyor belt. The intercepting roller includes a brush roller, which is installed between the conveyor belt and the screen cylinder. The brush roller is connected to a third drive assembly.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] 1) This invention divides the space between the upper part of the screen cylinder and the inner side of the machine casing into several independent compartments. Each compartment contains several cleaning balls to clean the screen cylinder in the corresponding compartment area, cleaning relatively evenly along the axial direction of the screen cylinder and reducing clumping. Simultaneously, each compartment along the independent axial direction is equipped with ball-beating components arranged in a figure-eight pattern. These components are driven by a second drive component, reciprocating within a certain angle range. The opening receives the cleaning balls sliding down from above the screen cylinder, while the closing bounces the balls upwards, actively clearing the screen. This solves the problem of poor screen-cleaning effect in existing equipment. The machine casing covers the upper part of the screen cylinder, providing sealing, dust prevention, and protection. The discharge channel design facilitates material output and enables graded discharge.

[0019] 2) The elastic limiting component of the present invention plays a buffering and limiting role, preventing the ball-playing assembly from being damaged due to excessive movement, and at the same time, stopping the rotation of the ball-playing assembly.

[0020] 3) The aperture of each segmented screen roller of the present invention gradually increases from the feed end to the discharge end, which can realize multi-level fine grading of grains and adapt to the screening needs of grains with different particle sizes.

[0021] 4) The present invention has a gap between the upper partition plate and the screen cylinder, and the gap width is smaller than the radius of the cleaning ball, which can effectively prevent the cleaning ball from falling out of the gap or getting stuck in the gap, and ensure that the cleaning ball is always constrained in the independent axial upper compartment.

[0022] 5) The guide strip of the present invention can guide the cleaning ball to the ball-striking assembly during the bouncing process, and the ball-blocking plate can prevent the cleaning ball from falling off from both sides of the screen cylinder, ensuring that the cleaning ball always moves in the upper area of ​​the screen cylinder.

[0023] 6) The incomplete gear of the present invention drives two meshing gears to rotate intermittently, thereby realizing the intermittent contraction action of the ball-bouncing assembly.

[0024] 7) The brush roller of the present invention can perform preliminary cleaning of large particulate impurities and tangled fibrous impurities discharged from the discharge end of the screen cylinder, prevent blockage and assist in material conveying, which enhances the overall anti-blocking capability of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the first overall structure of the grain fine screening equipment integrating anti-clogging net and self-cleaning according to the present invention.

[0026] Figure 2 This is a schematic diagram of the second overall structure of the grain fine screening equipment integrating anti-clogging net and self-cleaning according to the present invention.

[0027] Figure 3 This is an exploded view of an integrated anti-clogging net and self-cleaning grain fine screening device according to the present invention.

[0028] Figure 4 This is a schematic diagram of the overall structure of the ball-playing assembly of the present invention in its open state.

[0029] Figure 5 This is a side view of the ball-playing assembly of the present invention in its open state.

[0030] Figure 6 This is a schematic diagram of the overall structure of the ball-playing assembly in the retracted state of the present invention.

[0031] Figure 7 This is a side view of the ball-bounce assembly of the present invention in its retracted state.

[0032] The numbers in the diagram are as follows: 1. Frame; 101. Base frame; 102. Lower partition plate; 103. Discharge channel; 2. Screen cylinder; 3. First drive assembly; 301. First motor; 302. Gearbox; 303. First transmission component; 4. Machine housing; 5. Upper partition plate; 6. Cleaning ball; 7. Ball-playing assembly; 701. Rotating rod; 702. Ball-playing plate; 703. End strip; 8. Second drive assembly; 801. Incomplete gear; 802. Gear; 803. Second transmission component; 9. Elastic limiting component; 901. Fixing strip; 902. Spring; 903. End plate; 10. Guide strip; 11. Ball-blocking plate; 1101. Arc plate; 1102. Straight plate; 12. Conveyor belt; 13. Interception roller; 1301. Brush roller; 1302. Third drive assembly. 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, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] like Figures 1-3 As shown, the present invention provides an integrated grain fine screening equipment with anti-clogging net and self-cleaning, including a frame 1, a screen cylinder 2, a first drive assembly 3, a casing 4, an upper partition plate 5, a cleaning ball 6, a ball-bounce assembly 7, a second drive assembly 8, an elastic limiting component 9, a guide bar 10, a ball-blocking plate 11, a conveyor belt 12, and an intercepting roller 13.

[0035] The top of the frame 1 is rotatably connected to the screen cylinder 2, which can be driven by the first drive component 3.

[0036] The frame 1 includes a base frame 101. Several lower partition plates 102 are equidistantly arranged in a straight line along the axial direction of the screen cylinder 2 on the top of the base frame 101. Adjacent lower partition plates 102 form independent axial lower compartments that correspond one-to-one with screen cylinders of different aperture sizes in the screen cylinder 2. The bottom of each independent axial lower compartment is equipped with a discharge channel 103. This allows the grain after being screened by the screen cylinder 2 to fall into the corresponding lower compartment, avoiding mixing of grains of different particle sizes. The bottom of each independent axial lower compartment is fixedly equipped with a discharge channel 103, through which the screened grain can be smoothly discharged, achieving graded discharge.

[0037] The top of the frame 1 is also equipped with a first drive assembly 3, which includes a first motor 301. The power output end of the first motor 301 is connected to a reduction gearbox 302 and a first transmission component 303, and the power input end of the screen cylinder 2 is connected through the reduction gearbox 302 and the first transmission component 303. The power output by the first motor 301 is reduced by the reduction gearbox 302 and transmitted by the first transmission component 303, and then delivered to the power input end of the screen cylinder 2 to drive the screen cylinder 2 to rotate stably, which facilitates screening.

[0038] The screen cylinder 2 is an assembly of screen drums with different apertures set in sections along the axial direction. The screen cylinder 2 can be driven by the first drive component 3 to rotate, thereby completing the grain screening operation. The screen cylinder 2 is assembled from screen sections with different apertures set in sections along the axial direction. The aperture of the screen holes on each screen section gradually increases from the feed end to the discharge end, which can realize multi-level fine grading of grains and adapt to the screening needs of grains with different particle sizes. The screen cylinder 2 is symmetrically provided with guide strips 10 and ball-blocking plates 11. Both guide strips 10 and ball-blocking plates 11 can be used with ball-bounce components 7. The ball-blocking plate 11 includes an arc plate 1101. A straight plate 1102 is installed on the top of the arc plate 1101 and the top of the straight plate 1102 is fixed to the inner side wall of the casing 4.

[0039] The casing 4 is fixed to the top of the frame 1. Several upper partition plates 5 are arranged in a straight line at equal intervals along the axial direction of the screen cylinder 2 on the upper part of the inner side wall of the casing 4. Adjacent upper partition plates 5 and adjacent lower partition plates 102 form independent axial compartments, and each compartment is equipped with several cleaning balls 6. The casing 4 covers the upper part of the screen cylinder 2, which plays a role in sealing, dust prevention and protection.

[0040] The cleaning net 6 is made of food-grade polymer material, preferably made of high-elasticity material, which can bounce to clean the outer wall of the screen cylinder 2 of the corresponding compartment area.

[0041] The bottom of the upper partition plate 5 and the top of the screen cylinder 2 are left with a gap, and the height of the gap is less than the radius of the cleaning ball 6. This can effectively prevent the cleaning ball 6 from falling out of the gap or getting stuck in the gap, ensuring that the cleaning ball 6 is always constrained in the independent axial upper compartment.

[0042] Two sets of ball-bounce components 7 are symmetrically arranged above the screen cylinder 2, arranged in a figure-eight pattern, with the small end facing upwards from the screen cylinder 2 and being driven by the second drive component 8, stretching along the root of the small end.

[0043] The ball-playing assembly 7 includes a rotating rod 701, which is arranged along the axial direction of the screen cylinder 2. Several ball-playing pieces 702 are fixedly installed on the rotating rod 701 at equal intervals along the axial direction. Both ends of the rotating rod 701 are fixed with end strips 703, which are parallel and correspond to the ball-playing pieces 702. They can work with the elastic limiting member 9 to limit the contraction angle of the ball-playing pieces 702. At the same time, when the second driving assembly 8 stops driving the ball-playing assembly 7, the elastic limiting member 9 can reset and open the two sets of symmetrically arranged ball-playing pieces 702.

[0044] The guide strip 10 is fixed to the outer wall of the upper partition plate 5, which can guide the cleaning ball 6 to the ball assembly 7 during the bouncing process; the ball blocking plate 11 includes an arc plate 1101 whose curvature is adapted to the rotation trajectory of the ball plate 702, and a straight plate 1102 is fixedly installed on the top of the arc plate 1101. The top of the straight plate 1102 is fixed to the inner wall of the housing 4. The ball blocking plate 11 can prevent the cleaning ball 6 from falling off from both sides of the screen cylinder 2, ensuring that the cleaning ball 6 always moves in the area above the screen cylinder 2.

[0045] A second drive assembly 8 is installed on the outer wall of the housing 4. The second drive assembly 8 includes two meshing spur gears 802. A second transmission member 803 is provided at the shaft of the spur gears 802 and is connected to the end of the rotating rod 701 through the second transmission member 803.

[0046] An incomplete gear 801 meshes with the outer wall of the spur gear 802. The incomplete gear 801 can be driven to rotate by an external motor, which in turn drives the two meshing spur gears 802 to rotate intermittently, realizing the intermittent contraction action of the ball assembly 7. When the rotation of the ball assembly 7 stops, the end piece 903 pressed by the end bar 703 and the contracted spring 902 rebound to reset and open the ball assembly 7.

[0047] The elastic limiting member 9 is fixed to the outer wall of the housing 4 and can cooperate with the end strip 703. The elastic limiting member 9 includes a fixing strip 901, and a spring 902 is installed on the side of the fixing strip 901 facing the end strip 703. The other end of the spring 902 is equipped with an end piece 903 that can cooperate to abut against the end strip 703. When the ball assembly 7 is stretched to the maximum angle, the end strip 703 contacts the end piece 903, and the spring 902 is compressed, which plays a buffering and limiting role to prevent the ball assembly 7 from being damaged due to excessive movement. At the same time, when the rotation of the ball assembly 7 stops, the end piece 903 pressed by the end strip 703 and the compressed spring 902 rebound, causing the ball assembly 7 to reset and open.

[0048] The feed end of the screen cylinder 2 is equipped with an intercepting roller 13 and a conveyor belt 12. The intercepting roller 13 includes a brush roller 1301, which is installed between the conveyor belt 12 and the screen cylinder 2. The brush roller 1301 can be driven to rotate by a third drive component 1302. The surface of the brush roller 1301 is provided with a flexible brush, which can preliminarily clean large particles and tangled fibrous impurities discharged from the discharge end of the screen cylinder 2. The setting height of the brush roller 1301 needs to be such that it does not obstruct the feeding of grain into the screen cylinder 2, and can preliminarily clean the light impurities such as fibrous impurities on the top of the grain.

[0049] The working process of this invention is as follows: Powered by an external power source, the conveyor belt 12, the third drive component 1302, and the first drive component 3 are turned on by an external switch. The grain to be screened is conveyed by the conveyor belt 12 to the feeding end of the screen cylinder 2. The feeding end of the screen cylinder 2 is equipped with an intercepting roller 13 and the conveyor belt 12. The intercepting roller 13 includes a brush roller 1301. The brush roller 1301 can be driven to rotate by the third drive component 1302. The surface of the brush roller 1301 is provided with a flexible brush, which can initially clean the large particle impurities and entangled fibrous impurities discharged from the discharge end of the screen cylinder 2. The setting height of the brush roller 1301 needs to be such that it does not obstruct the grain from being put into the screen cylinder 2, and can initially clean the light impurities such as fibrous impurities on the top of the grain.

[0050] The first drive assembly 3 drives the screen cylinder 2 to rotate at a uniform speed. The grain that has been initially cleaned falls into the screen cylinder 2. Under the action of centrifugal force and its own gravity, the grain moves forward along the inner wall of the screen cylinder 2. Since the screen cylinder 2 has an axial segmented structure with different apertures, grain particles of different sizes pass through the corresponding segmented screen apertures and fall into the corresponding axial lower compartment on the frame 1. Then, the graded material is discharged through the discharge channel 103.

[0051] It should be noted that the aperture of each segmented screen cylinder gradually increases from the feed end to the discharge end, which can realize multi-level fine grading of grains and adapt to the screening needs of grains with different particle sizes. That is, small-diameter grains first pass through the small-diameter screen cylinder, while large-diameter grains are intercepted in the small-diameter screen cylinder section and roll to the corresponding large-diameter screen cylinder to pass through. This process is repeated, and large particle impurities and fibrous impurities are discharged with the grains to the discharge end of screen cylinder 2.

[0052] Several upper partition plates 5 are fixedly installed on the top of the inner wall of the casing 4 along the axial direction of the screen cylinder 2, dividing the space between the upper part of the screen cylinder 2 and the inner side of the casing 4 into several independent axial upward compartments. Several cleaning balls 6 are placed in each compartment, which can locally clean the outer wall of the screen cylinder 2 in the corresponding compartment area, ensuring that the cleaning balls 6 are roughly evenly distributed along the axial direction of the screen cylinder 2, effectively reducing the phenomenon of the cleaning balls 6 clustering together and reducing the occurrence of local cleaning blind spots.

[0053] Each independent axial compartment is equipped with a ball-playing assembly 7 arranged in a figure-eight pattern. The smaller end of the ball-playing assembly 7 faces upwards towards the screen cylinder 2. Powered by an external power source, an external motor that drives the second drive assembly 8 can be activated by an external switch. This motor drives the incomplete gear 801 to rotate, which in turn drives two meshing spur gears 802 to rotate intermittently. Power is transmitted through the second transmission component 803, causing the two sets of ball-playing assemblies 7 to reciprocate along the root of their smaller ends. Figures 4-7 As shown.

[0054] When the ball-bounce assembly 7 opens, it is guided by the guide bar 10 to receive the cleaning ball 6 sliding down from above the screen cylinder 2. When the ball-bounce assembly 7 closes, it can quickly bounce the cleaning ball 6 against the outer wall of the screen cylinder 2, so that the cleaning ball 6 continuously bounces between the outer wall of the screen cylinder 2 and the machine casing 4, repeatedly hitting the screen holes of the screen cylinder 2, shaking off the adhering substances, stuck dust and fine impurities in the screen holes, and achieving efficient self-cleaning.

[0055] The ball-blocking plate 11 includes an arc plate 1101 whose curvature is adapted to the rotation trajectory of the ball-striking plate 702, and a straight plate 1102 is fixedly installed on the top of the arc plate 1101. The top of the straight plate 1102 is fixed to the inner side wall of the housing 4. The ball-blocking plate 11 can prevent the cleaning ball 6 from falling off from both sides of the screen cylinder 2, ensuring that the cleaning ball 6 always moves in the area above the screen cylinder 2.

[0056] When the ball-bounce assembly 7 is stretched to its maximum angle, the end bar 703 contacts the end piece 903, and the spring 902 is compressed, which acts as a buffer and limit to prevent the ball-bounce assembly 7 from being damaged due to excessive movement. At the same time, when the rotation of the ball-bounce assembly 7 stops, the end piece 903 pressed by the end bar 703 and the compressed spring 902 rebound, causing the ball-bounce assembly 7 to reset and open. This repetitive action allows the ball-bounce assembly 7 to repeatedly open and close within a certain angle range, collecting the tennis ball 6 and guiding it to the top of the screen cylinder 2. Since the screen cylinder 2 is continuously rotating, the tennis ball 6 only bounces and does not rotate with it, which can clean a relatively comprehensive area of ​​the screen cylinder 2 radially and reduce missed cleaning (the first motor 301, the external motor of the second drive assembly 8 and the third drive assembly 1302 all use existing products and are all connected to an external power supply and an external switch).

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A grain fine screening device integrating anti-clogging net and self-cleaning, characterized in that, It includes a frame (1), a housing (4), a screen cylinder (2), a first drive assembly (3), a ball-bouncing assembly (7), and a second drive device; the screen cylinder (2) is installed inside the housing (4), the housing (4) is installed on the frame (1), the first drive assembly (3) is connected to and drives the screen cylinder (2) to rotate; two sets of symmetrical ball-bouncing assemblies (7) are symmetrically installed in a figure-eight shape above the screen cylinder (2), and the second drive device is connected to and drives the ball-bouncing assembly (7) to rotate. The casing (4) is provided with an upper partition plate (5), and the frame (1) is provided with a lower partition plate (102). Multiple upper partition plates (5) and lower partition plates (102) are arranged equidistantly along the axis of the screen cylinder (2). Adjacent lower partition plates (102) form a compartment. Each compartment is provided with multiple cleaning balls (6). The side of the compartment closest to the ground is provided with a discharge channel (103).

2. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The ball-playing assembly (7) includes a rotating rod (701), a ball-playing plate (702), and an end bar (703). One end of the rotating rod (701) is connected to a second driving device, and the other end is connected to the ball-playing plate (702). The ball-playing plate (702) extends along the axis of the screen cylinder (2), and the end bar (703) is installed on one side of the ball-playing plate (702). An elastic limiting member (9) is also fixed inside the housing (4). When the end bar (703) contacts the elastic limiting member (9), the ball-playing plate (702) rotates to its limit position.

3. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 2, characterized in that, The elastic limiting member (9) includes a fixing strip (901), a spring (902) and an end piece (903). The fixing strip (901) is installed on one side near the end strip (703) and the spring (902) is installed on the other end of the spring (902). The end piece (903) is in contact with the end strip (703).

4. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The screen cylinder (2) includes multiple screen sections with screen holes of different diameters, and the diameter of the screen holes on the screen sections gradually increases from the feed end to the discharge end.

5. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The upper partition plate (5) and the screen cylinder (2) have a gap, and the gap width is smaller than the radius of the cleaning ball (6).

6. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The first drive assembly (3) includes a first motor (301), a gearbox (302) and a first transmission component (303). The first motor (301) is mounted on the frame (1) and its output shaft is connected to the input shaft of the gearbox (302). The output shaft of the gearbox (302) is connected to the first transmission component (303), and the first transmission component (303) is connected to the power input end of the screen cylinder (2).

7. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The second drive assembly (8) includes two meshing gears (802), and a second transmission member (803) is mounted on the shaft of the gears (802). The second transmission member (803) is connected to the rotating rod (701) of the ball-bounce assembly (7).

8. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 7, characterized in that, An incomplete gear (801) is also meshed on the outside of the gear (802), and the incomplete gear (801) is connected to the second motor.

9. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The device also includes a guide bar (10) and a ball-blocking plate (11). The guide bar (10) is installed on the ball-bounce assembly (7) and extends along the axial direction of the screen cylinder (2). The ball-blocking plate (11) includes an arc plate (1101) and a straight plate (1102). The straight plate (1102) is installed on the side of the arc plate (1101) away from the ground. The straight plate (1102) is connected to the inner wall of the casing (4). The ball-bounce assembly (7) rotates in the space formed by the arc plate (1101).

10. The integrated anti-clogging net and self-cleaning grain fine screening equipment according to claim 1, characterized in that, The screen cylinder (2) is provided with an intercepting roller (13) and a conveyor belt (12) at one end. The intercepting roller (13) includes a brush roller (1301). The brush roller (1301) is installed between the conveyor belt (12) and the screen cylinder (2). The brush roller (1301) is connected to a third drive assembly (1302).

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