A multi-stage grain screening equipment

Abstract

The present invention relates to the technical field of grain screening, and specifically discloses a multi-stage grain screening device, including a frame, a screen drum rotatably arranged on the frame, and a driving member driving the screen drum to rotate, the screen drum is provided with screen plates at intervals along its outer periphery, the screen plates are connected with screen rods evenly distributed along the axial direction of the screen drum, the spacing between two adjacent screen rods is equal to the diameter of the screen holes of the screen drum, the screen rods slide with the screen drum along the radial direction of the screen drum, the end of the screen rods away from the screen plate is rotatably connected with a baffle, a collecting plate and a conveying assembly connected to the frame are provided in the screen drum, the screen plate is connected with a driving assembly 1 driving it to drive the screen rods to move along the radial direction of the screen drum, and the baffle is connected with a driving assembly 2 driving it to rotate. The multi-stage grain screening device of the present invention can screen large grains and impurities and discharge them from the screen drum in time, avoid large grains and impurities staying in the screen drum for a long time, and avoid the phenomenon of repeated blocking or covering of the screen holes, thereby improving the screening efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of grain screening, and in particular to a multi-stage grain screening device. Background Art

[0002] Grains come in different sizes. To meet different processing requirements, grains need to be screened according to their particle size. For example, flour processing requires fine-grained grains, while some feed processing may require coarse-grained grains. Screening is beneficial to improving the efficiency and quality of subsequent processing. However, in the process of screening grains, grains often get stuck in the sieve holes, affecting the screening efficiency.

[0003] A Chinese patent application with publication number CN117680353A discloses a segmented and graded grain cylindrical screen for grain screening, comprising a bottom plate, a support seat being fixedly connected to the edge of the top of the bottom plate, a cylindrical screen being fixedly connected to the top of the support seat, an outer surface of the cylindrical screen being fixedly connected to an outer shell, the cylindrical screen comprising a fixed plate, an outer surface of the fixed plate being fixedly connected to the inner surface of the outer shell, an outer surface of the fixed plate being rotatably connected to a rotating screen, an outer surface of a partition plate being fixedly connected to a cleaning assembly, an outer surface of the rotating screen being fixedly connected to a fixed block, the cleaning assembly comprising a cross plate, an outer surface of the cross plate being fixedly connected to the outer surface of the partition plate, a cleaning roller being fixedly connected to the bottom of the cross plate, and an elastic plate being fixedly connected to the edge of the bottom of the cross plate.

[0004] When in use, the motor drives the rotating screen to rotate, and the rotating screen drives the fixed block to move. The cleaning roller contacts the surface of the rotating screen to sweep away the grain stuck inside the screen holes. When the fixed block moves to the elastic plate, the elastic plate contacts the fixed block. The two cooperate to drive the rotating screen to vibrate. The cleaning component speeds up the grain screening speed and prevents the screen holes from being blocked.

[0005] However, the cleaning component of the above technical solution will clean and vibrate the grains and impurities stuck in the sieve holes into the rotating screen. During the rotation of the rotating screen, the cleaned and vibrated grains and impurities may get stuck in the sieve holes again, which cannot effectively solve the problem of larger grains and impurities blocking the sieve holes. Moreover, larger grains and impurities are continuously mixed with the grains to be screened out, and the larger grains and impurities will cover the sieve holes, thereby affecting the rapid screening of the required grains, resulting in low screening efficiency.

[0006] Therefore, the art needs a multi-stage grain screening device to solve the above problems. Summary of the invention

[0007] The present invention provides a multi-stage grain screening device, aiming to solve the problem that the grain screening device in the related art cannot quickly screen and discharge large grain particles and impurities that block and cover the sieve holes from the sieve cylinder, resulting in frequent blockage of the sieve holes and low screening efficiency.

[0008] The multi-stage grain screening device of the present invention comprises a frame, a screen drum rotatably arranged on the frame and a driving member driving the screen drum to rotate, the screen drum is provided with screen plates at intervals along its outer periphery, the screen plates are fixedly connected with screen rods evenly distributed along the axial direction of the screen drum, the spacing between two adjacent screen rods is equal to the screen hole diameter of the screen drum, the screen rods are slidably matched with the screen drum along the radial direction of the screen drum, the end of the screen rods away from the screen plate is rotatably connected with a baffle, a collecting plate and a conveying assembly connected with the frame are arranged in the screen drum, the screen plate is connected with a driving assembly 1 driving it to drive the screen rods to move along the radial direction of the screen drum, and the baffle is connected with a driving assembly 2 driving it to rotate;

[0009] When the sieve plate moves along station one, the side of the baffle plate facing the center of the sieve cylinder is flush with the inner wall of the sieve cylinder; when the sieve plate moves along station two, the driving component one drives the sieve plate to drive the sieve rod to move into the sieve cylinder; when the sieve plate moves along station three, the driving component two drives the baffle plate to rotate to a state perpendicular to the sieve rod to prevent the grains screened on the sieve rod from falling off; when the sieve plate moves along station four, the driving component one drives the sieve plate to drive the sieve rod to move out of the sieve cylinder, so that the grains screened on the sieve rod fall onto the collecting plate; the conveying component is used to send the grains on the collecting plate out of the sieve cylinder.

[0010] Beneficial effect: The present invention provides a sieve rod that slides with the sieve drum. When the sieve rod follows the sieve drum to rotate upward, the sieve rod extends into the grains in the sieve drum to screen larger grains and carry the larger grains synchronously. When the sieve rod continues to move and tilts downward, the larger grains can slide into the collecting plate, and the larger grains on the collecting plate are discharged from the sieve drum through the conveying assembly, thereby achieving timely discharge of large grains, avoiding the large grains staying in the sieve drum for a long time and repeatedly blocking or covering the sieve holes, thereby improving screening efficiency.

[0011] Preferably, the driving component 1 includes a guide block and a guide groove, the guide block is fixedly connected to the two ends of the screen plate, the guide groove is opened on the side wall of the frame, the guide block slides with the corresponding guide groove, and the guide groove includes an arc portion 1 corresponding to the station 1, an inclined portion 1 corresponding to the station 2, an arc portion 2 corresponding to the station 3, and an inclined portion 2 corresponding to the station 4.

[0012] Beneficial effect: By setting the guide block and the guide groove, when the screen plate follows the movement of the screen drum, the guide block moves along the guide groove, and under the guidance of the guide groove, the screen plate is driven to move toward or away from the screen drum, thereby driving the screen rod, so that the screen rod can be extended into or pulled out of the screen drum at the appropriate position. The structural coordination is ingenious, eliminating the cost of setting up a separate driving source.

[0013] Preferably, a socket is provided on the rotating shaft for rotationally connecting the baffle plate and the screen rod, and a torsion spring is arranged between the rotating shaft and the screen rod, the screen rod is connected with an insertion rod along its axial sliding direction, and the screen plate moves to station two. Before the baffle plate is fully moved to the inner side of the screen cylinder, the driving component two drives the insertion rod to be inserted into the socket so that the baffle plate and the screen rod are located in the same plane. During the movement of the screen plate along station three, the driving component two drives the insertion rod to disengage from the socket, and the torsion spring drives the baffle plate to move to a state perpendicular to the screen rod.

[0014] Beneficial effect: By controlling the baffle to rotate at a suitable position to a state perpendicular to the sieve rod, the grains screened on the sieve rod can be blocked to prevent large grains on the sieve rod from sliding off the sieve rod.

[0015] Preferably, drive component two includes a guide bar arranged on the side wall of the frame and a guide rod fixedly connected to the end of the insertion rod, the guide rod is elastically connected to the screen plate through spring one, when the guide rod is not subjected to external force, the insertion rod is located outside the insertion hole, the screen plate moves to station two, before the baffle plate is completely moved to the inside of the screen cylinder, the guide bar pushes the guide rod to drive the insertion rod to be inserted into the insertion hole, during the movement of the screen plate along station three, the guide rod is disengaged from the guide bar, and spring one drives the guide rod to drive the insertion rod to disengage from the insertion hole.

[0016] Preferably, a mounting groove is provided on one side of the screen rod facing the rotation direction of the screen drum, a vibration plate is elastically connected to the mounting groove through spring 2, the vibration plate is in contact with the groove wall of the mounting groove, and a driving structure for driving the vibration plate to vibrate is provided in the screen rod.

[0017] Beneficial effect: Vibrating the grains on the screen bars through the vibration plate is conducive to the small grains on the screen bars to quickly fall through the gaps between the screen bars, thereby improving the screening efficiency and screening effect.

[0018] Preferably, the driving structure includes a bump one and a bump two, a plurality of bumps one are evenly arranged on the vibration plate along the axial direction of the insertion rod, bump two is fixedly connected to the insertion rod, and bump two abuts against the vibration plate, during the movement of the insertion rod, bump two pushes bump one to drive the vibration plate to move in the direction of the tension spring two, and when bump two is separated from bump one, the vibration plate hits bump two under the elastic force of spring two.

[0019] Preferably, the guide bar is provided with a wave section, and the wave section is wave-shaped. When the screen plate moves along the workstation three, the guide rod moves along the wave section.

[0020] Preferably, the guide groove also includes a reciprocating portion arranged between the inclined portion 2 and the arc-shaped portion 1, the reciprocating portion includes a continuously arranged V-shaped groove, and when the guide block moves along the reciprocating portion, the screen plate drives the screen rod to reciprocate along the radial direction of the screen cylinder, and when the guide block moves to the tip position of the V-shaped groove, the screen plate contacts the screen cylinder.

[0021] Beneficial effect: When the sieve plate moves along the reciprocating part, it contacts the sieve cylinder and knocks on the outer wall of the sieve cylinder, so that the grains blocked in the sieve holes can be shaken off. On the one hand, the sieve holes are unblocked, and on the other hand, the grains shaken into the sieve cylinder can be screened by the sieve rod and poured onto the collecting plate, and discharged from the sieve cylinder in time to avoid repeated blockage of the sieve holes.

[0022] Preferably, the conveying assembly includes a mounting shaft and a spiral blade fixedly connected to the mounting shaft. The mounting shaft is rotatably connected to the frame, and a gear is fixedly connected to the mounting shaft. A gear ring meshing with the gear is provided on the inner periphery of the screen drum. When the screen drum rotates, the gear ring drives the gear and the mounting shaft to rotate, and the mounting shaft drives the spiral blade to rotate.

[0023] Preferably, the driving member includes a driving motor and two driving rollers, the driving motor is fixedly connected to the frame, the driving rollers are rotatably connected to the frame, and one of the driving rollers is fixedly connected to the output end of the driving motor, and the two driving rollers are respectively fixedly connected with support wheels, which abut against the outer periphery of the screen drum.

[0024] The beneficial effects of the present invention are:

[0025] (1) The present invention provides a sieve rod that is slidably matched with the sieve drum. When the sieve rod rotates upward with the sieve drum, the sieve rod extends into the grains in the sieve drum to screen the larger grains and carry the larger grains to move synchronously. When the sieve rod continues to move and tilts downward, the larger grains can slide into the collecting plate, and the larger grains on the collecting plate are discharged from the sieve drum through the conveying assembly, thereby achieving timely discharge of large grains, avoiding the large grains staying in the sieve drum for a long time, causing the sieve holes to be repeatedly blocked or covered, and improving the screening efficiency.

[0026] (2) The present invention provides a baffle. When the sieve rod drives the grains upward, the baffle can rotate to a position perpendicular to the sieve rod, thereby blocking the grains screened on the sieve rod and preventing large grains on the sieve rod from sliding off the sieve rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a multi-stage grain screening device of the present invention.

[0028] Figure 2 The present invention is a schematic structural diagram of a screen drum of a multi-stage grain screening device.

[0029] Figure 3 The invention discloses an assembly diagram of a sieve plate, a sieve rod and a baffle plate of a multi-stage grain screening device.

[0030] Figure 4 It is a cross-sectional view of a multi-stage grain screening device of the present invention.

[0031] Figure 5 It is a cross-sectional view of a frame of a multi-stage grain screening device of the present invention.

[0032] Figure 6 The present invention is a cross-sectional view of a sieve plate, a sieve rod and a baffle plate of a multi-stage grain screening device.

[0033] Reference numerals:

[0034] 1. Frame; 11. Feed inlet; 12. Discharge outlet; 13. Collecting box; 14. Discharge outlet; 2. Screen drum; 21. Gear ring; 3. Drive motor; 31. Drive roller; 32. Support wheel; 4. Screen plate; 40. Guide block; 41. Screen rod; 42. Baffle; 43. Socket; 44. Insert rod; 45. Guide rod; 46. Bump 2; 47. Spring 1; 5. Collecting plate; 6. Mounting shaft; 61. Spiral blade; 62. Gear; 7. Arc portion 1; 71. Inclined portion 1; 72. Arc portion 2; 73. Inclined portion 2; 74. V-shaped groove; 8. Guide strip; 81. Wave section; 9. Vibrating plate; 91. Bump 1. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] like Figures 1 to 6 As shown, a multi-stage grain screening device of the present invention comprises a frame 1, a screen drum 2 rotatably arranged on the frame 1, and a driving member driving the screen drum 2 to rotate. The frame 1 is provided with a feed port 11 connected to one end of the screen drum 2 and a discharge port 12 connected to the other end of the screen drum 2, and the screen drum 2 is inclined downward from the end close to the feed port 11 to the end close to the discharge port 12. A collection box 13 fixedly connected to the frame 1 is arranged below the screen drum 2, and a discharge port 14 is opened at the bottom of the collection box 13. The driving member comprises a driving motor 3 and two driving roller shafts 31, the driving motor 3 is fixedly connected to the frame 1, the driving roller shaft 31 is rotatably connected to the frame 1, and one of the driving roller shafts 31 is fixedly connected to the output end of the driving motor 3. The two driving roller shafts 31 are respectively fixedly connected to support wheels 32, and the support wheels 32 are supported on the outer periphery of the screen drum 2. The driving motor 3 drives the driving roller 31 to rotate, the driving roller 31 drives the supporting wheel 32 to rotate, and the supporting wheel 32 drives the screen drum 2 to rotate, so that the grains in the screen drum 2 are turned over in the screen drum 2, and the grains with smaller particles fall from the screen holes into the collecting box 13 and are discharged from the discharge port 14.

[0037] like Figures 2 to 4As shown, the sieve drum 2 is evenly spaced along its outer periphery with a plurality of sieve plates 4, and the sieve plates 4 are fixedly connected with a plurality of sieve rods 41 evenly spaced along the axial direction of the sieve drum 2, and the spacing between two adjacent sieve rods 41 is equal to the diameter of the sieve holes of the sieve drum 2. The sieve rods 41 are slidably matched with the sieve drum 2 along the radial direction of the sieve drum 2, and the end of the sieve rods 41 away from the sieve plate 4 is rotatably connected with a baffle 42. The sieve drum 2 is provided with a collecting plate 5 connected to the frame 1 and a conveying assembly, the sieve plate 4 is connected with a driving assembly 1 that drives it to drive the sieve rods 41 to move along the radial direction of the sieve drum 2, and the baffle 42 is connected with a driving assembly 2 that drives it to rotate.

[0038] When the sieve plate 4 moves along the first station, the baffle 42 and the sieve rod 41 are located in the same plane, and the side of the baffle 42 facing the center of the sieve cylinder 2 is flush with the inner wall of the sieve cylinder 2; when the sieve plate 4 moves along the second station, the driving component 1 drives the sieve plate 4 to drive the sieve rod 41 to move into the sieve cylinder 2, the sieve rod 41 is inserted into the grains, and rotates with the sieve cylinder 2, the sieve rod 41 carries a part of the grains and moves with the sieve cylinder 2. During the movement, the grains with smaller particles fall from the gaps between the sieve rods 41, and the grains with larger particles and impurities are intercepted by the sieve rods 41; when the sieve plate 4 moves along the third station, the driving component 2 drives the baffle 42 to rotate to a state perpendicular to the sieve rod 41 to prevent the grains screened on the sieve rod 41 from falling off; when the sieve plate 4 moves to the fourth station, the driving component 1 drives the sieve plate 4 to drive the sieve rod 41 to move out of the sieve cylinder 2, so that the grains screened on the sieve rod 41 fall onto the collecting plate 5.

[0039] like Figure 4 and Figure 5 As shown, the conveying assembly includes a mounting shaft 6 and a spiral blade 61 fixedly connected to the mounting shaft 6. The mounting shaft 6 is rotatably connected to the frame 1, and a gear 62 is fixedly connected to the mounting shaft 6. The inner periphery of the screen drum 2 is provided with a gear ring 21 meshing with the gear 62. When the screen drum 2 rotates, the gear ring 21 drives the gear 62 and the mounting shaft 6 to rotate, and the mounting shaft 6 drives the spiral blade 61 to rotate. The spiral blade 61 conveys the larger grains on the collecting plate 5 to the discharge port 12, so that the large grains are discharged from the screen drum 2 in time to prevent the large grains from clogging the screen holes.

[0040] like Figures 3 to 5As shown, the driving assembly 1 includes a guide block 40 and a guide groove. The guide block 40 is fixedly connected to the two ends of the screen plate 4. The guide groove is provided on the side wall of the frame 1. The guide block 40 is slidably matched with the corresponding guide groove. The guide groove includes an arc portion 17 corresponding to the station 1, an inclined portion 171 corresponding to the station 2, an arc portion 272 corresponding to the station 3, and an inclined portion 273 corresponding to the station 4. When the guide block 40 moves along the arc portion 17, the baffle 42 and the screen rod 41 are located in the same plane, and the side of the baffle 42 facing the center of the screen cylinder 2 is flush with the inner wall of the screen cylinder 2. When the guide block 40 moves along the inclined portion 171, the screen plate 4 and the screen rod 41 are driven to move inside the screen cylinder 2. When the guide block 40 moves along the arc portion 272, the screen plate 4 is in contact with the outer wall of the screen cylinder 2, and the screen rod 41 extends into the screen cylinder 2. When the guide block 40 moves along the inclined portion 273, the screen plate 4 and the screen rod 41 are driven to move outside the screen cylinder 2.

[0041] The guide groove further includes a reciprocating portion disposed between the inclined portion 2 73 and the arc portion 1 7, and the reciprocating portion includes a continuously disposed V-shaped groove 74. When the guide block 40 moves along the reciprocating portion, the sieve plate 4 drives the sieve rod 41 to reciprocate along the radial direction of the sieve cylinder 2, and when the guide block 40 moves to the tip position of the V-shaped groove 74, the sieve plate 4 contacts the sieve cylinder 2, realizing intermittent knocking of the sieve plate 4 on the sieve cylinder 2, so that the grains blocked in the sieve holes are shaken off.

[0042] like Figures 4 to 6 As shown, a plug hole 43 is provided on the rotating shaft that is rotatably connected to the baffle plate 42 and the screen rod 41, and a torsion spring (not shown in the figure) is provided between the rotating shaft and the screen rod 41. When the baffle plate 42 is not subjected to external force, the torsion spring makes the baffle plate 42 perpendicular to the screen rod 41. The screen rod 41 is connected with an insertion rod 44 along its axial sliding. The guide block 40 on the screen plate 4 moves to the inclined portion 1 71. Before the baffle plate 42 is fully moved to the inside of the screen drum 2, the drive assembly 2 drives the insertion rod 44 to be inserted into the plug hole 43, so that even if the baffle plate 42 is fully extended to the inside of the screen drum 2, it can remain in the same plane with the screen rod 41, ensuring that the baffle plate 42 and the screen rod 41 can be smoothly inserted into the grain. When the guide block 40 on the sieve plate 4 moves along the arc portion 72, the driving component 2 drives the insertion rod 44 to disengage from the insertion hole 43, and the torsion spring drives the baffle 42 to move to a state perpendicular to the sieve rod 41. The baffle 42 blocks the large-grain grains screened on the sieve rod 41 to prevent the grains from sliding off the sieve rod 41 when the sieve rod 41 moves upward following the sieve drum 2.

[0043] Driving assembly 2 includes a guide bar 8 fixedly connected to the side wall of the frame 1 and a guide rod 45 fixedly connected to the end of the insertion rod 44. The guide rod 45 is elastically connected to the screen plate 4 through a spring 47. When the guide rod 45 is not subjected to external force, the insertion rod 44 is located outside the insertion hole 43. When the guide block 40 of the sieve plate 4 moves along the arc portion 7, the baffle 42 is limited by the wall of the sieve drum 2 and is in the same plane as the sieve rod 41. When the sieve plate 4 follows the movement of the sieve drum 2, the guide rod 45 contacts the guide bar 8. Before the guide block 40 on the sieve plate 4 moves to the inclined portion 71 and the baffle 42 completely moves to the inner side of the sieve drum 2, the guide bar 8 pushes the guide rod 45 to drive the insertion rod 44 to be inserted into the insertion hole 43. When the guide block 40 on the sieve plate 4 moves along the arc portion 72, the guide rod 45 disengages from the guide bar 8, the spring 47 drives the guide rod 45 to drive the insertion rod 44 to disengage from the insertion hole 43, and the torsion spring drives the baffle 42 to move to a state perpendicular to the sieve rod 41.

[0044] like Figures 4 to 6 As shown, a mounting groove (not shown in the figure) is provided on one side of the screen rod 41 facing the rotation direction of the screen drum 2, and a vibration plate 9 is elastically connected in the mounting groove through a second spring (not shown in the figure), and the vibration plate 9 fits the groove wall of the mounting groove, and a driving structure for driving the vibration plate 9 to vibrate is provided in the screen rod 41. The driving structure includes a convex block 91 and a convex block 46, and a plurality of convex blocks 91 are evenly spaced along the axial direction of the insertion rod 44 on the vibration plate 9, and the convex block 46 is fixedly connected to the insertion rod 44, and the convex block 46 abuts against the vibration plate 9.

[0045] The guide bar 8 is provided with a wave section 81, and the wave section 81 is wave-shaped. During the movement of the sieve plate 4 along the workstation three, that is, during the movement of the guide block 40 on the sieve plate 4 along the arc-shaped portion 2 72, the guide rod 45 moves along the wave section 81, and the guide rod 45 drives the insertion rod 44 to reciprocate in the insertion hole 43 without being separated from the insertion hole 43. The protrusion 2 46 on the insertion rod 44 pushes the protrusion 1 91 to drive the vibration plate 9 to move in the direction of the tension spring 2. When the protrusion 2 46 is separated from the protrusion 1 91, the vibration plate 9 hits the protrusion 2 46 under the elastic force of the spring 2, thereby realizing repeated pushing of the vibration plate 9 and causing the vibration plate 9 to vibrate, which is beneficial for the smaller particles of grain on the sieve rod 41 to quickly fall from the gap between the sieve rods 41, thereby improving the screening efficiency and screening effect.

[0046] It can be understood that in other embodiments, the driving component 1 can also be configured to include an automatic telescopic rod and a position sensor, the automatic telescopic rod is fixedly installed on the outside of the screen cylinder 2, the output end of the automatic telescopic rod is fixedly connected to the screen plate 4, and when the position sensor detects that the screen plate 4 moves to station two, the screen plate 4 is controlled by the automatic telescopic rod to drive the screen rod 41 to move into the screen cylinder 2. When it is detected that the screen plate 4 moves to station four, the screen plate 4 is controlled by the automatic telescopic rod to move outside the screen cylinder 2.

[0047] It can also be understood that, in other embodiments, the baffle 42 is rotatably connected to the sieve rod 41 via a rotating shaft, the driving component two includes a motor, the output end of the motor is fixedly connected to the rotating shaft, and when the sieve plate 4 is active at stations one and two, the baffle 42 is maintained at a position located in the same plane as the sieve rod 41, and when the sieve plate 4 is active along station three, the motor drives the baffle 42 to rotate to a position perpendicular to the sieve rod 41, and when the sieve plate 4 is active to station four, the motor drives the baffle 42 to return to a position located in the same plane as the sieve rod 41.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A multi-stage grain screening device, comprising a frame, a screen drum rotatably arranged on the frame, and a driving member for driving the screen drum to rotate, characterized in that: The screen drum is provided with screen plates at intervals along its outer periphery, and the screen plates are fixedly connected with screen rods evenly distributed along the axial direction of the screen drum, and the spacing between two adjacent screen rods is equal to the screen hole diameter of the screen drum, and the screen rods are slidably matched with the screen drum along the radial direction of the screen drum, and the end of the screen rods away from the screen plate is rotatably connected with a baffle, and a collecting plate and a conveying assembly connected to the frame are arranged in the screen drum, and the screen plate is connected with a driving assembly 1 that drives it to drive the screen rods to move along the radial direction of the screen drum, and the baffle is connected with a driving assembly 2 that drives it to rotate; When the sieve plate moves along station one, the side of the baffle plate facing the center of the sieve cylinder is flush with the inner wall of the sieve cylinder; when the sieve plate moves along station two, the driving component one drives the sieve plate to drive the sieve rod to move into the sieve cylinder; when the sieve plate moves along station three, the driving component two drives the baffle plate to rotate to a state perpendicular to the sieve rod to prevent the grains screened on the sieve rod from falling off; when the sieve plate moves along station four, the driving component one drives the sieve plate to drive the sieve rod to move out of the sieve cylinder, so that the grains screened on the sieve rod fall onto the collecting plate; the conveying component is used to send the grains on the collecting plate out of the sieve cylinder; The driving assembly 1 includes a guide block and a guide groove. The guide block is fixedly connected to both ends of the screen plate. The guide groove is provided on the side wall of the frame. The guide block is slidably matched with the corresponding guide groove. The guide groove includes an arc portion 1 corresponding to the station 1, an inclined portion 1 corresponding to the station 2, an arc portion 2 corresponding to the station 3, and an inclined portion 2 corresponding to the station 4. A plug hole is provided on the rotating shaft that is rotatably connected to the baffle plate and the screen rod, and a torsion spring is provided between the rotating shaft and the screen rod. The screen rod is connected with a plug rod along its axial sliding direction. The screen plate moves to the second station. Before the baffle plate is fully moved to the inner side of the screen cylinder, the driving component 2 drives the plug rod to be inserted into the plug hole so that the baffle plate and the screen rod are located in the same plane. During the movement of the screen plate along the third station, the driving component 2 drives the plug rod to disengage from the plug hole, and the torsion spring drives the baffle plate to move to a state perpendicular to the screen rod. Driving component two includes a guide bar arranged on the side wall of the frame and a guide rod fixedly connected to the end of the insertion rod. The guide rod is elastically connected to the screen plate through spring one. When the guide rod is not subjected to external force, the insertion rod is located outside the insertion hole. The screen plate moves to station two. Before the baffle plate is completely moved to the inside of the screen cylinder, the guide bar pushes the guide rod to drive the insertion rod to be inserted into the insertion hole. During the movement of the screen plate along station three, the guide rod is separated from the guide bar, and spring one drives the guide rod to drive the insertion rod to separate from the insertion hole.

2. The multi-stage grain screening device according to claim 1, characterized in that: A mounting groove is provided on one side of the screen rod facing the rotation direction of the screen drum, a vibration plate is elastically connected in the mounting groove through a second spring, the vibration plate fits the groove wall of the mounting groove, and a driving structure for driving the vibration plate to vibrate is arranged in the screen rod.

3. The multi-stage grain screening device according to claim 2, characterized in that: The driving structure includes a bump one and a bump two. A plurality of bumps one are evenly arranged on the vibration plate along the axial direction of the insertion rod. The bump two is fixedly connected to the insertion rod, and the bump two is against the vibration plate. During the movement of the insertion rod, the bump two pushes the bump one to drive the vibration plate to move in the direction of the tension spring two. When the bump two is separated from the bump one, the vibration plate hits the bump two under the elastic force of the spring two.

4. The multi-stage grain screening device according to claim 3, characterized in that: The guide bar is provided with a wave section which is wave-shaped. When the screen plate moves along the third station, the guide rod moves along the wave section.

5. The multi-stage grain screening device according to claim 1, characterized in that: The guide groove also includes a reciprocating portion arranged between the inclined portion 2 and the arc-shaped portion 1, and the reciprocating portion includes a continuously arranged V-shaped groove. When the guide block moves along the reciprocating portion, the screen plate drives the screen rod to reciprocate along the radial direction of the screen cylinder, and when the guide block moves to the tip position of the V-shaped groove, the screen plate contacts the screen cylinder.

6. The multi-stage grain screening device according to claim 1, characterized in that: The conveying assembly includes a mounting shaft and a spiral blade fixedly connected to the mounting shaft. The mounting shaft is rotatably connected to the frame, and a gear is fixedly connected to the mounting shaft. A gear ring meshing with the gear is provided on the inner periphery of the screen drum. When the screen drum rotates, the gear ring drives the gear and the mounting shaft to rotate, and the mounting shaft drives the spiral blade to rotate.

7. The multi-stage grain screening device according to claim 1, characterized in that: The driving component includes a driving motor and two driving rollers. The driving motor is fixedly connected to the frame. The driving rollers are rotatably connected to the frame. One of the driving rollers is fixedly connected to the output end of the driving motor. The two driving rollers are respectively fixedly connected with support wheels, which abut against the outer periphery of the screen drum.

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