Granary stored grain sorting and impurity removing equipment

Abstract

The invention discloses granary stored grain sorting and impurity removing equipment which comprises fixing columns symmetrically fixed to the surface of a specific gravity stoner, plum blossom knobs and a screening mechanism are arranged on the fixing columns in a penetrating mode, and the screening mechanism comprises a frame with one end rotationally installed on the inner side wall of the specific gravity stoner. The device comprises a frame, a pair of screens and a through hole mechanism are symmetrically installed between the frames, the through hole mechanism comprises a center control rod arranged between the frames, a pair of impurity removal plates are symmetrically and rotatably connected to the center control rod, and a plurality of ejector pins are slidably installed in the impurity removal plates at equal intervals. The two screens are driven to slide in a staggered mode, so that meshes are aligned or staggered, the screening requirements of grains with different grain sizes are met, leakage of small-particle grains caused by too large meshes is avoided, the problem that the meshes are too small and prone to blockage is solved, and the applicability and screening efficiency of equipment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of grain screening technology, specifically to a grain storage sorting and impurity removal device. Background Technology

[0002] Before grain can be stored in a granary, it must undergo a series of strict pre-treatment procedures. The core purpose of these procedures is to ensure the long-term safety and quality stability of the stored grain. These procedures typically include, but are not limited to: preliminary cleaning to remove large and light impurities; core cleaning to accurately separate heavy impurities such as boulders and to grade the grain size; and critical dehumidification and drying to control the moisture content within safe standards. These procedures are interconnected and together form the technical foundation for the safe storage of grain.

[0003] In the above process, preliminary cleaning is the first step, and its effect directly affects the load of subsequent processes and the final clean grain quality. At present, the industry widely uses gravity destoners as key equipment at this stage. Gravity destoners mainly rely on the difference in specific gravity and suspension velocity between grain and impurities. Through the combined action of vibrating screen surface and airflow, they efficiently remove heavy impurities such as stones and mud, and have played an important role in practice.

[0004] However, existing gravity destoners still have significant limitations in adapting to the complexity of grain storage operations. Grain storage facilities handle a variety of grain types, and different types of grain have significant differences in particle size. Most mainstream gravity destoners currently use a single-layer screen design with a fixed mesh size. This structure reveals its inherent inadequacy when dealing with different types of grain.

[0005] Fixed mesh sizes make it difficult to achieve optimal screening when switching grain types: meshes that are too large may cause small-diameter grains to leak out, resulting in losses; meshes that are too small are prone to clogging the screen holes, affecting the flow of large-diameter grains and destoning efficiency, and may even cause the equipment to malfunction. Therefore, there is an urgent need for a more effective technical solution to address this problem of deep clogging of screens. Summary of the Invention

[0006] The purpose of this invention is to provide a grain sorting and impurity removal device for grain storage, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a grain storage sorting and impurity removal device, including a gravity destoner, wherein fixed columns are symmetrically fixed on both sides of the gravity destoner, and a plum blossom knob is provided through the fixed column;

[0008] The screening mechanism includes a frame rotatably mounted on the inner wall of the gravity destoner at one end. A plum blossom column is rotatably mounted on both ends of the frame at positions horizontally aligned with a fixed column. Adjusting clamps are rotatably mounted inside both ends of the frame, and the plum blossom column is fixedly mounted on the corresponding adjusting clamp. Two adjusting slots are symmetrically provided through the adjusting clamp. A pair of screens are symmetrically installed between the two frames. An extension rod is fixedly provided at the top of each screen. A protruding post is fixedly provided on the outer side of the bottom end of the screen and on the outer side of the extension rod, and the protruding post is slidably mounted inside the corresponding adjusting slot.

[0009] The through-hole mechanism includes a central control rod disposed between the frames, and the central control rod is located at the top of the screen. A pair of impurity removal plates are symmetrically rotatably connected to the central control rod. Several needle outlet holes are equidistantly opened at the ends of the impurity removal plates. Several pins are equidistantly slidably installed inside the impurity removal plates, and each pin is slidably connected to the corresponding needle outlet hole.

[0010] Preferably, the screening mechanism further includes a torsion spring sleeved on the plum blossom column, the plum blossom column being elastically connected to the inside of the frame via the torsion spring, a second spring being installed inside the adjustment groove, and the protruding column being elastically connected to the inside of the adjustment groove via the second spring.

[0011] Preferably, the screening mechanism further includes several cooperating rods fixed at equal intervals on one side of the screen, and a through groove is provided on the corresponding side of the other screen to allow the cooperating rods to pass through, thereby preventing the two screens from not fitting together due to the cooperating rods hitting the side of the frame, and side sliding grooves are provided on both sides of the frame.

[0012] Preferably, the through-hole mechanism further includes T-shaped covers fixed to both ends of the central control rod, and the T-shaped covers are slidably connected to the corresponding side slide grooves. A lever and a third spring are installed inside the T-shaped cover. The lever is elastically connected to the inside of the T-shaped cover through the third spring, and one end of the lever protrudes from the side of the T-shaped cover, while the other end of the lever is fixed with a double-sided toothed plate.

[0013] Preferably, the through-hole mechanism further includes a rotating shaft fixed to the rotational position of the impurity removal plate and the central control rod. The rotating shaft is rotatably connected inside the central control rod. A splitting gear is fixed at the end of the rotating shaft, and the splitting gear meshes with a corresponding double-sided toothed plate. A transmission rack is slidably installed inside the impurity removal plate. A wedge is fixed at one end of the transmission rack, and the wedge protrudes from the end of the impurity removal plate. A fourth spring is installed at the other end of the transmission rack, and the transmission rack is elastically connected to the inside of the impurity removal plate through the fourth spring.

[0014] Preferably, the impurity removal plate is further provided with a base plate, and a plurality of ejector pins are fixed at equal intervals on the top surface of the base plate. A plurality of racks are fixed at equal intervals on the bottom surface of the base plate, and the racks are meshed with the transmission racks through transmission gears.

[0015] Preferably, a plurality of positioning plates are fixedly installed at equal intervals on the inner side wall of the gravity destoner, and the positioning plates abut against the screen frame.

[0016] Preferably, the bottom end of the screen and the end of the extension rod are both provided with large-area ear plates to block the open cavity opened inside the frame for the adjustment clamp to rotate, so as to prevent impurities or grains from entering the open cavity.

[0017] Preferably, a long plate is fixed to the side of the central control rod, and one end of a folding rod is symmetrically and rotatably connected to the upper and lower sides of the long plate. The other end of the folding rod is rotatably connected to a brush plate. Limiting strips are fixed to both ends of the long plate, and slots are opened at both ends of the brush plate. The limiting strips are slidably connected to the slots. The middle part of the folding rod can rotate freely, and one end of a connecting rod is rotatably connected to the middle part of the folding rod. The other end of the connecting rod is rotatably connected to the back of the corresponding impurity removal plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The adjustable clamp is driven by a rotatable plum blossom knob, which causes the two screens to slide out of alignment, thus aligning or offsetting the meshes to meet the screening needs of grains of different sizes. This achieves flexible adjustment of the screen mesh size, which not only avoids the loss of small grains due to excessively large meshes, but also solves the problem of easy clogging due to excessively small meshes, significantly improving the applicability and screening efficiency of the equipment.

[0020] 2. This invention incorporates a foldable impurity removal plate during the screen cleaning process. The end of the plate scrapes against the screen surface, removing and cutting off larger impurities stuck between the mesh openings. Simultaneously, the wedges on the plate contact the mating rods on the screen frame one by one during movement, pushing the internal transmission rack to slide. This utilizes the meshing of the rack and transmission gear to drive the ejector pins to extend from the pin outlet holes and insert into the corresponding mesh openings, thereby pushing out the stubborn impurities stuck in the mesh. This achieves efficient and thorough screen unblocking, significantly reducing the difficulty of manual cleaning and equipment downtime.

[0021] 3. When the impurity removal plate opens, the connecting rod pushes the folding rod to unfold, so that the brush plate is in close contact with the screen surface. After the impurity removal plate completes the scraping and pin-through hole, the brush plate immediately brushes the screen surface to remove residual dust and light impurities, realizing secondary cleaning of the screen surface, further improving the overall cleaning effect of the screen, preventing impurities from accumulating in the gaps between the screens, and ensuring the continuous and stable operation of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the gravity destoner in this invention;

[0024] Figure 3 In this invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 This is a cross-sectional view of the fixed column and frame in this invention;

[0026] Figure 5 This is a schematic diagram showing the interaction between the plum blossom knob, the adjusting clamp, and the screen in this invention;

[0027] Figure 6 This is a schematic diagram of the cooperation between the adjusting clamp and the screen of the present invention;

[0028] Figure 7 This is a schematic cross-sectional view of the frame of the present invention;

[0029] Figure 8 This is a schematic diagram showing the relationship between the through-hole mechanism and the screen during operation in this invention;

[0030] Figure 9 This is a partial cross-sectional view of the central control rod in this invention;

[0031] Figure 10 This is a partial cross-sectional schematic diagram of the control rod and the impurity removal plate in this invention;

[0032] Figure 11 This is a schematic diagram of the fit between the transmission rack and the base plate in this invention;

[0033] Figure 12 This is a side view of the through-hole mechanism and brush plate in this invention.

[0034] In the diagram: 10. Gravity destoner; 11. Fixed column; 12. Plum blossom knob; 13. First spring; 14. Positioning plate; 20. Frame; 21. Plum blossom column; 22. Adjusting clamp; 23. Adjusting groove; 24. Torsion spring; 25. Screen; 26. Extension rod; 27. Protruding column; 28. Matching rod; 29. ​​Through groove; 291. Side sliding groove; 292. Second spring; 30. Central control rod; 31. T-shaped cover 32. Lever; 33. Third spring; 34. Double-sided toothed plate; 40. Impurity removal plate; 41. Rotating shaft; 42. Opening and closing gear; 43. Needle outlet; 44. Transmission rack; 45. Wedge block; 46. Base plate; 47. Ejector pin; 48. Rack; 49. Transmission gear; 491. Fourth spring; 50. Long plate; 51. Folding rod; 52. Connecting rod; 53. Brush plate; 54. Limiting strip; 55. Slot. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-12 The present invention provides a technical solution: a grain sorting and impurity removal device for grain storage;

[0037] Example 1: Please refer to the appendix of the instruction manual. Figure 1 , 3 4, 5, 6, 7 and 8, this embodiment is described by way of one feasible structure in a comparative heavy destoner;

[0038] The device includes a gravity destoner 10, with fixed columns 11 symmetrically fixed on both sides of the gravity destoner 10, and plum blossom knobs 12 penetrating through the fixed columns 11.

[0039] The screening mechanism includes a frame 20 rotatably mounted on the inner wall of the gravity destoner 10 at one end. A plum blossom column 21 is rotatably mounted on both ends of the frame 20 at positions horizontally aligned with the fixed column 11. Adjusting clamps 22 are rotatably mounted inside both ends of the frame 20, and the plum blossom column 21 is fixedly mounted on the corresponding adjusting clamp 22. Two adjusting grooves 23 are symmetrically provided through the adjusting clamp 22. A pair of screens 25 are symmetrically installed between the two frames 20. An extension rod 26 is fixedly mounted at the top of each screen 25. A protruding column 27 is fixedly mounted on the outer side of the bottom end of the screen 25 and the outer side of the extension rod 26, and the protruding column 27 is slidably mounted inside the corresponding adjusting groove 23.

[0040] The screening mechanism also includes a torsion spring 24 sleeved on the plum blossom column 21. The plum blossom column 21 is elastically connected to the inside of the frame 20 through the torsion spring 24. A second spring 292 is installed inside the adjustment groove 23. The protruding column 27 is elastically connected to the inside of the adjustment groove 23 through the second spring 292.

[0041] The screening mechanism also includes several mating rods 28 that are equidistantly fixed on one side of the screen 25. A through groove 29 is provided on the corresponding side of the other screen 25 to allow the mating rods 28 to pass through, thereby preventing the two screens 25 from not fitting together due to the mating rods 28 hitting the side. Side sliding grooves 291 are provided on both sides of the frame 20.

[0042] Several positioning plates 14 are fixedly installed at equal intervals on the inner side wall of the gravity destoner 10, and the positioning plates 14 abut against the frame of the screen 25.

[0043] The bottom of the screen 25 and the end of the extension rod 26 are both equipped with large ear plates to block the open cavity inside the frame 20 for the adjustment clamp 22 to rotate, preventing impurities or grains from entering the open cavity.

[0044] In this embodiment, two screens 25 are movably installed inside the frame 20, with the bottom end of the frame 20 rotatably installed inside the gravity destoner 10. When cleaning the screens 25, the top of the frame 20 can be lifted directly to rotate the frame 20 to a vertical position, thereby facilitating the subsequent through-hole mechanism to clean and remove impurities from the screens 25.

[0045] After the frame 20 and screen 25 are installed together on the internal mesh frame of the gravity destoner 10, the positioning plate 14 is installed in sequence to ensure that the positioning plate 14 presses the two screens 25 tightly.

[0046] To ensure that the plum blossom knob 12 can engage with the corresponding plum blossom column 21 after the frame 20 is installed, the plum blossom knob 12 is designed as a sliding connection, and a first spring 13 is sleeved on the plum blossom knob 12. The first spring 13 ensures that the end of the plum blossom knob 12 always protrudes from the inner wall of the gravity destoner 10. Before installing the frame 20 and the screen 25 as a whole on the screen frame, the plum blossom knob 12 needs to be pulled to the outside of the gravity destoner 10. The plum blossom knob 12 compresses the first spring 13, and its originally protruding end retracts into the fixed column 11, so that the frame 20 can be installed smoothly.

[0047] During operation, the gravity destoner 10 will drive the frame 20 and screen 25 to vibrate synchronously to screen grain.

[0048] To improve the versatility of this invention and address the issue of varying grain sizes among different grain varieties during grain sorting, the invention employs two sieves 25 that can slide in an alternating manner. When the two sieves 25 are flush together, their mesh sizes are aligned, resulting in the largest mesh size. When the two sieves 25 are staggered, the upper and lower mesh sizes are offset according to the staggered distance between them, thereby adjusting the mesh size to efficiently match the grain sizes of different grain varieties and improve grain sorting efficiency.

[0049] The specific implementation method is as follows: Before installing the positioning plate 14, rotate the plum blossom knob 12 on the outer fixing column 11 of the gravity destoner 10. The end of the plum blossom knob 12 is engaged with the plum blossom column 21 on the outer side of the frame 20. Rotating the plum blossom knob 12 can drive the adjusting clamp 22 inside the frame 20 to rotate through the plum blossom column 21, as shown in the instruction manual. Figure 6 As shown, when the adjusting clamp 22 rotates, the adjusting groove 23 can drive the protruding column 27 to move laterally, thereby driving the screen 25 to move laterally relative to each other, thus misaligning the two meshes and changing their throughput.

[0050] After adjusting, install the positioning plate 14 to stabilize the two screens 25.

[0051] Example 2: Please refer to the appendix of the instruction manual. Figure 4 , 7 Based on Example 1, Examples 8, 9, 10, 11, and 12 take into account that in Example 1, during the grain screening process, whether the mesh size is at its maximum or reduced, there are relatively hard stones and sand particles in the grain that get stuck in the mesh and are difficult to fall out, thus clogging the screen 25 and reducing screening efficiency. In particular, after the screen 25 is stepped and bonded, there may be large particles stuck between two corresponding meshes at the same time, which may damage the screen 25 in severe cases. Therefore, Example 2 solves the problem of clogging and difficulty in cleaning of the double-layer screen 25 through the following structure.

[0052] The through-hole mechanism includes a central control rod 30 disposed between the frames 20, and the central control rod 30 is located at the top of the screen 25. A pair of impurity removal plates 40 are symmetrically rotatably connected to the central control rod 30. Several needle outlet holes 43 are equidistantly opened at the ends of the impurity removal plates 40. Several pins 47 are equidistantly slidably installed inside the impurity removal plates 40, and each pin 47 is slidably connected to the corresponding needle outlet hole 43.

[0053] The through-hole mechanism also includes a T-shaped cover 31 fixed to both ends of the central control rod 30, and the T-shaped cover 31 is slidably connected to the inside of the corresponding side slide groove 291. A lever 32 and a third spring 33 are installed inside the T-shaped cover 31. The lever 32 is elastically connected to the inside of the T-shaped cover 31 through the third spring 33, and one end of the lever 32 protrudes from the side of the T-shaped cover 31, while the other end of the lever 32 is fixed with a double-sided toothed plate 34.

[0054] The through-hole mechanism also includes a rotating shaft 41 fixed at the rotational position of the impurity removal plate 40 and the central control rod 30. The rotating shaft 41 is rotatably connected inside the central control rod 30. A splitting gear 42 is fixed at the end of the rotating shaft 41, and the splitting gear 42 meshes with the corresponding double-sided toothed plate 34. A transmission rack 44 is slidably installed inside the impurity removal plate 40. A wedge 45 is fixed at one end of the transmission rack 44, and the wedge 45 protrudes from the end of the impurity removal plate 40. A fourth spring 491 is installed at the other end of the transmission rack 44, and the transmission rack 44 is elastically connected to the inside of the impurity removal plate 40 through the fourth spring 491.

[0055] Inside the impurity removal plate 40, there is also a base plate 46, and several ejector pins 47 are fixed at equal intervals on the top surface of the base plate 46. Several racks 48 are fixed at equal intervals on the bottom surface of the base plate 46, and the racks 48 and the transmission rack 44 are connected by a transmission gear 49.

[0056] In this embodiment, firstly, the positioning plate 14 is removed, the plum blossom knob 12 is reversed, and the adjusting clamp 22 is adjusted back to its initial position (the position perpendicular to the frame 20). Then, the plum blossom knob 12 is pulled outward to separate the plum blossom knob 12 from the plum blossom column 21. Then, the top of the frame 20 is lifted, and the frame 20 is rotated to the vertical horizontal plane with the bottom end as the center.

[0057] After the adjusting clamp 22 is reset and the positioning plate 14 is no longer restricted, the second spring 292 inside the adjusting groove 23 pushes the protrusion 27 away from the plum blossom column 21, thereby causing the two screens 25 to move away from each other through the extension rod 26. The mating rod 28 on the edge of each screen 25 slides out from the other corresponding through groove 29 until the two screens 25 reach their maximum distance. The separation design of the two screens 25, on the one hand, breaks them down into smaller parts, making it easier for the through-hole mechanism to enter and clean each screen 25 individually; on the other hand, the separation action itself can peel off impurities that are stuck in the corresponding mesh at the same time, thereby significantly reducing the cleaning difficulty of the through-hole mechanism.

[0058] Initially, the angle between the two impurity removal plates 40 is small, and their inner sides abut against each other. This makes the height of the impurity removal plates 40 smaller, making it easier for them to slide between the two screens 25.

[0059] As described above, after the two screens 25 reach their maximum distance, the operator holds the T-shaped cover 31 in the side sliding groove 291, causing the T-shaped cover 31 to slide inside the side sliding groove 291, thereby driving the through-hole mechanism to enter between the two screens 25. Then, the operator presses the lever 32 on the side of the T-shaped cover 31. The lever 32 compresses the third spring 33 and drives the double-sided toothed plate 34 inside the central control rod 30 to slide. The double-sided toothed plate 34 drives the two impurity removal plates 40 to rotate through the opening and closing gear 42, thereby opening them to the position specified in the instruction manual. Figure 8 The state shown.

[0060] When the included angle of the impurity removal plate 40 is large enough, the end of the impurity removal plate 40 can abut against the surface of the screen 25, and the more pressure is applied to the lever 32, the tighter the impurity removal plate 40 abuts against the screen 25.

[0061] The operator pulls the T-shaped cover 31 to continue sliding inside the side slide groove 291. The impurity removal plate 40 sweeps across the surface of the screen 25, pushing the impurities between the two screens 25 downwards. At the same time, the end of the impurity removal plate 40 that abuts against the surface of the screen 25 is relatively sharp, which can cut off the protruding impurities and reduce the volume of the impurities. This not only allows some impurities to fall off automatically, but also makes it easier for the ejector pin 47 to eject the impurities from the mesh.

[0062] Each screen 25 has equidistant mating rods 28 on one side of its frame, corresponding to each row of mesh. When the end of the impurity removal plate 40 sweeps across each row of mesh, the wedge 45 protruding from one end of the impurity removal plate 40 will abut against the corresponding mating rod 28. The mating rod 28 will press the wedge 45 into the impurity removal plate 40. The wedge 45 will drive the transmission rack 44 to slide inside the impurity removal plate 40 and compress the fourth spring 491. The transmission rack 44 will then use the meshing of the transmission gear 49 and the rack 48 to lift the bottom plate 46. The bottom plate 46 will eject the ejector pins 47 from each pin hole 43 and insert them into the corresponding mesh of the screen 25. The thrust will push out the impurities stuck in the mesh, thus achieving a simple and efficient removal of impurities that are difficult to remove from the mesh, greatly improving the efficiency of cleaning the screen 25.

[0063] Example 3: Please refer to the appendix of the instruction manual. Figure 7 , 9 Based on Embodiment 1, Embodiment 3 takes into account that the space between the two screens 25 in Embodiment 1 is limited, which may make it easier to retain more dust and other impurities. Moreover, when the through-hole mechanism cleans the impurities in the mesh, some particles may bounce into the space between the two screens 25, causing the pollution to expand and the cleaning difficulty to increase. Therefore, Embodiment 3 solves the problem of dust cleaning and replenishment points between the two screens 25 through the following structure.

[0064] A long plate 50 is fixed to the side of the central control lever 30. One end of a folding rod 51 is symmetrically and rotatably connected to the upper and lower sides of the long plate 50. The other end of the folding rod 51 is rotatably connected to a brush plate 53. Limiting strips 54 are fixed to both ends of the long plate 50. The brush plate 53 has slots 55 at both ends. The limiting strips 54 are slidably connected in the slots 55. The middle part of the folding rod 51 can rotate freely, and one end of a connecting rod 52 is rotatably connected to the middle part of the folding rod 51. The other end of the connecting rod 52 is rotatably connected to the back of the corresponding impurity removal plate 40.

[0065] In this embodiment, a long plate 50 is fixedly installed on the side of the central control rod 30, and folding rods 51 are symmetrically arranged on the side of the long plate 50. When the impurity removal plate 40 is in the folded state, the impurity removal plate 40 pulls the middle of the folding rod 51 through the connecting rod 52, causing the folding rod 51 to fold in half, and its folding angle becomes smaller, thereby reducing the height of the brush plate 53, which is not only convenient for storage, but also helps to reduce the difficulty for the brush plate 53 to follow the through hole mechanism into the space between the two screens 25.

[0066] After pressing the lever 32, the impurity removal plate 40 rotates, increasing its angle. As the plate rotates, it also drives the joints of the folding rod 51 to rotate via the connecting rod 52. The angle of the folding rod 51 gradually increases, and the distance between the two brush plates 53 gradually increases until the brush plates 53 contact the surface of the screen 25. Similarly, the greater the pressure on the lever 32, the larger the angle of the impurity removal plate 40, and the higher the folding rod 51 lifts the brush plates 53. This results in greater pressure on the brush plates 53 against the screen 25. This provides sufficient pressure when the impurity removal plate 40 scrapes the surface of the screen 25 and when the brush plates 53 brush the surface, ensuring that the impurity removal plate 40 and brush plates 53 adhere closely to the surface of the screen 25 during movement, thus improving cleaning efficiency.

[0067] As the through-hole mechanism slides along the side slide groove 291, after it completes the action of removing impurities from the mesh, the brush plate 53 linked to it immediately brushes the surface of the screen 25 to remove residual dust and light impurities, thereby achieving secondary cleaning on the basis of mechanical through-holes and comprehensively improving the cleaning effect of the screen surface.

[0068] Working principle: The gravity destoner 10 has a support frame 20 and a screen 25 inside. The bottom end of the frame 20 is rotatably connected to the inside of the gravity destoner 10. Before installing the frame 20 and screen 25 on the screen, the plum blossom knob 12 needs to be pulled outwards from the gravity destoner 10. This causes the plum blossom knob 12 to compress the first spring 13 and retract into the fixed column 11, avoiding obstruction of the rotation of the frame 20, thus allowing the frame 20 and screen 25 to be installed smoothly.

[0069] Depending on the type of grain to be sorted, the mesh size of the screen 25 can be adjusted independently. The specific operation is as follows: After the frame 20 and the screen 25 are installed on the screen frame, the plum blossom knob 12 is released. Under the elastic force of the first spring 13, the plum blossom knob 12 pops out from the inside of the gravity destoner 10 and engages with the plum blossom column 21 on the outer side of the end of the frame 20. Then, the plum blossom knob 12 is rotated, and the plum blossom knob 12 can drive the adjusting clamp 22 to rotate through the plum blossom column 21. Since the top of the screen 25 is fixed with an extension rod 26, and the protrusion 27 fixed at the bottom of the screen 25 and the end of the extension rod 26 slides in the adjusting groove 23 on the adjusting clamp 22, when the adjusting clamp 22 rotates, it can drive the two screens 25 to slide relative to each other, so that the two meshes that were originally vertically connected are staggered, thereby gradually reducing the size of the mesh connection and achieving the effect of adjusting the throughput of the screen 25.

[0070] After adjusting to the appropriate size, install several positioning plates 14 on the inner wall of the gravity destoner 10, with the bottom end of the positioning plates 14 firmly against the frame of the screen 25. Grain screening can then be performed.

[0071] When cleaning the screen 25, the first step is to remove all the positioning plates 14, and then pull the plum blossom knob 12 outward again. The plum blossom knob 12 separates from the plum blossom column 21 and retracts into the fixed column 11.

[0072] Then, lift the top of frame 20, rotating frame 20 around its bottom to a vertical horizontal plane. After losing the restraint of positioning plate 14, the plum blossom column 21 rotates back to the position specified in the instruction manual under the elastic force of torsion spring 24. Figure 8 As shown, the second spring 292 inside the adjusting groove 23 pushes the protrusion 27 away from the plum blossom column 21. The protrusion 27 at the bottom of the screen 25 and the protrusion 27 on the extension rod 26 drive the two screens 25 away from each other. The mating rod 28 on the frame of each screen 25 slides out from the other corresponding through groove 29 until the two screens 25 reach the farthest distance.

[0073] Next, hold the T-shaped cover 31 in the side slide groove 291 and slide the through-hole mechanism between the two screens 25. Then press the lever 32 on the side of the T-shaped cover 31. The lever 32 compresses the third spring 33 and drives the double-sided toothed plate 34 inside the central control rod 30 to slide. The double-sided toothed plate 34 drives the two impurity removal plates 40 to rotate through the opening and closing gear 42. The impurity removal plates 40 open, and their included angle increases until they open to the angle specified in the instruction manual. Figure 8 As shown, the end of the impurity removal plate 40 is in contact with the surface of the screen 25. As the pressure applied to the lever 32 increases, the impurity removal plate 40 becomes more tightly in contact with the screen 25.

[0074] Simultaneously, the increased angle of the impurity removal plate 40 drives the connecting rod 52 to move. The connecting rod 52 pushes the middle of the folding rod 51, causing the middle of the folding rod 51 to rotate, increasing its folding angle. This pushes the brush plate 53 at the other end of the folding rod 51 towards the screen 25, ultimately causing the brush plate 53 to press firmly against the surface of the screen 25. Similarly, the greater the pressure applied to the lever 32, the larger the angle of the impurity removal plate 40, the higher the folding rod 51 lifts the brush plate 53, and the greater the pressure of the brush plate 53 against the screen 25.

[0075] As the T-shaped cover 31 slides in the side sliding groove 291, the end of the impurity removal plate 40 sweeps across the surface of the screen 25, pushing impurities between the two screens 25 downwards. Simultaneously, the sharp end of the impurity removal plate 40 that contacts the surface of the screen 25 cuts off protruding impurities, reducing their volume and allowing some to fall off automatically. Following this, the brush plate 53, linked to the impurity removal plate 40, brushes the surface of the screen 25, removing residual dust and light impurities. This achieves secondary cleaning on top of the mechanical through-holes, comprehensively improving the cleaning effect of the screen surface.

[0076] When the impurity removal plate 40 scrapes through the screen 25, the wedge 45 protruding at one end is squeezed by each of the mating rods 28, causing the wedge 45 to push the transmission rack 44 inside the impurity removal plate 40 to slide. While compressing the fourth spring 491, the bottom plate 46 is lifted through the meshing of the transmission gear 49 and the rack 48, thereby pushing the ejector pin 47 out of the corresponding needle hole 43 and inserting it into the mesh of the corresponding screen 25. The thrust is used to push out the impurities stuck in the mesh one by one.

[0077] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grain storage sorting and impurity removal device, comprising a gravity destoner (10), characterized in that: The sides of both ends of the gravity destoner (10) are symmetrically fixed with fixed columns (11), and plum blossom knobs (12) are provided through the fixed columns (11). The screening mechanism includes a frame (20) rotatably mounted on the inner wall of the gravity destoner (10) at one end. A plum blossom column (21) is rotatably mounted on both ends of the frame (20) at a position horizontally aligned with the fixed column (11). Adjusting clamps (22) are rotatably mounted inside both ends of the frame (20), and the plum blossom column (21) is fixedly mounted on the corresponding adjusting clamp (22). Two adjusting grooves (23) are symmetrically provided through the adjusting clamp (22). A pair of screens (25) are symmetrically installed between the two frames (20). An extension rod (26) is fixedly provided at the top of the screen (25). A protruding column (27) is fixedly provided on the outer side of the bottom end of the screen (25) and the outer side of the extension rod (26), and the protruding column (27) is slidably mounted inside the corresponding adjusting groove (23). The through-hole mechanism includes a central control rod (30) disposed between the frames (20), and the central control rod (30) is located at the top of the screen (25). A pair of impurity removal plates (40) are symmetrically rotatably connected to the central control rod (30). Several needle holes (43) are equidistantly opened at the ends of the impurity removal plates (40). Several pins (47) are equidistantly slidably installed inside the impurity removal plates (40), and each pin (47) is slidably connected to the corresponding needle hole (43).

2. The grain sorting and impurity removal equipment for grain storage as described in claim 1, characterized in that: The screening mechanism also includes a torsion spring (24) sleeved on the plum blossom column (21), the plum blossom column (21) is elastically connected to the inside of the frame (20) through the torsion spring (24), a second spring (292) is installed inside the adjustment groove (23), and the protruding column (27) is elastically connected to the inside of the adjustment groove (23) through the second spring (292).

3. The grain sorting and impurity removal equipment for grain storage as described in claim 1, characterized in that: The screening mechanism also includes several mating rods (28) that are equidistantly fixed on one side of the screen (25). A through groove (29) is provided on the corresponding side of the other screen (25) to allow the mating rods (28) to pass through, thereby preventing the mating rods (28) from contacting the side and causing the two screens (25) to be unable to fit together. Side sliding grooves (291) are provided on both sides of the frame (20).

4. The grain sorting and impurity removal equipment for grain storage as described in claim 3, characterized in that: The through-hole mechanism also includes T-shaped covers (31) fixed to both ends of the central control rod (30), and the T-shaped covers (31) are slidably connected to the inside of the corresponding side slide groove (291). A lever (32) and a third spring (33) are installed inside the T-shaped cover (31). The lever (32) is elastically connected to the inside of the T-shaped cover (31) through the third spring (33), and one end of the lever (32) protrudes from the side of the T-shaped cover (31). The other end of the lever (32) is fixed with a double-sided toothed plate (34).

5. The grain sorting and impurity removal equipment for grain storage as described in claim 4, characterized in that: The through-hole mechanism also includes a rotating shaft (41) fixed at the rotational position of the impurity removal plate (40) and the central control rod (30). The rotating shaft (41) is rotatably connected inside the central control rod (30). A splitting gear (42) is fixed at the end of the rotating shaft (41), and the splitting gear (42) meshes with the corresponding double-sided toothed plate (34). A transmission rack (44) is slidably installed inside the impurity removal plate (40). A wedge (45) is fixed at one end of the transmission rack (44), and the wedge (45) protrudes from the end of the impurity removal plate (40). A fourth spring (491) is installed at the other end of the transmission rack (44), and the transmission rack (44) is elastically connected inside the impurity removal plate (40) through the fourth spring (491).

6. The grain sorting and impurity removal equipment for grain storage as described in claim 5, characterized in that: The impurity removal plate (40) is also provided with a base plate (46), and a number of ejector pins (47) are fixed at equal intervals on the top surface of the base plate (46). A number of racks (48) are fixed at equal intervals on the bottom surface of the base plate (46), and the racks (48) are connected to the transmission rack (44) by a transmission gear (49).

7. The grain sorting and impurity removal equipment for grain storage as described in claim 3, characterized in that: The inner wall of the gravity destoner (10) is fixedly equipped with several positioning plates (14) at equal intervals, and the positioning plates (14) abut against the frame of the screen (25).

8. The grain sorting and impurity removal equipment for grain storage as described in claim 1, characterized in that: The bottom of the screen (25) and the end of the extension rod (26) are both provided with large-area ear plates to block the open cavity opened inside the frame (20) for the adjustment clamp (22) to rotate, so as to prevent impurities or grains from entering the open cavity.

9. A grain storage sorting and impurity removal device according to claim 6, characterized in that: The central control rod (30) has a long plate (50) fixed on its side. The long plate (50) is symmetrically and rotatably connected to one end of a folding rod (51) on its upper and lower sides. The other end of the folding rod (51) is rotatably connected to a brush plate (53). Limiting strips (54) are fixed at both ends of the long plate (50). The brush plate (53) has slots (55) at both ends. The limiting strips (54) are slidably connected in the slots (55). The middle part of the folding rod (51) can rotate freely. The middle part of the folding rod (51) is rotatably connected to one end of a connecting rod (52). The other end of the connecting rod (52) is rotatably connected to the back of the corresponding impurity removal plate (40).

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