A self-cleaning urea granule screening device and cleaning component

Abstract

The present application relates to the technical field of urea granule forming and processing, and in particular to a self-cleaning urea granule screening device and a cleaning assembly, comprising two symmetrically distributed vertical plates, a screening plate installed between the two vertical plates, and a crushing mechanism and a self-cleaning mechanism installed on the two vertical plates. In the self-cleaning mechanism designed by the present invention, the cleaning brush can clean the urea granules adhering to the screening plate during the movement along the screening plate, so as to avoid the urea granules adhering to the screening plate due to moisture on the surface of the urea granules, resulting in the accumulation of urea granules on the screening plate and the clogging of the mesh of the screening plate, thereby improving the screening efficiency of the screening plate. At the same time, the cleaning brush can decelerate and hinder the urea granules during the screening process, thereby avoiding the possibility that the urea granules fall directly to the outside of the device without being screened by the mesh of the screening plate due to the urea granules falling too fast on the screening plate, thereby improving the screening effect of the urea granules.

Description

Technical Field

[0001] The present application relates to the technical field of urea granule molding and processing, and in particular to a self-cleaning urea granule screening device and a cleaning component. Background Art

[0002] Urea is a commonly used nitrogen fertilizer used in agricultural sowing production. Urea granules are usually obtained by spraying granulation of urea raw materials. The formed urea granules also need to be dried, packaged, etc. to obtain urea finished products.

[0003] In order to ensure the uniform distribution and reaction speed of urea granules during use, the urea granules need to be screened before packaging to ensure that urea granules of different diameters are stored separately to adapt to different usage scenarios.

[0004] For example, the publication number CN118142853B is a screening device for producing metal silicon powder, including a support frame, the upper end of the support frame is fixedly provided with reset springs near the four corners, the upper ends of the four sets of reset springs are fixedly connected with a screening box, the upper end of the screening box is fixedly provided with a screening cover, the lower end of the screening box is fixedly provided with a vibration motor near the center, the lower end and the inner side of the screening box are provided with a bulking mechanism, the lower side and one side of the bulking mechanism are provided with an anti-blocking mechanism, and one side of the support frame is provided with an anti-splashing mechanism near the upper side. The impact plate and the elastic ball are used to perform a two-way and dual-frequency double-layer collision on the screen body to achieve self-cleaning when the metal silicon powder is stuck in the screen hole of the screen. The coordinated use of the double-layer vibration wave improves the efficiency of self-cleaning and ensures the normal use of the subsequent screening device.

[0005] In actual application, the above-mentioned device can be used to screen powdery and granular materials. Although silicon powder is a metal material and urea is a non-metallic material, both are powder particles. Therefore, the above-mentioned device can also be used in the urea screening process. However, the following defects exist when using the above-mentioned device to screen metal silicon powder: 1. The above-mentioned prior art only applies external force to the screen by cooperating with the impact plate and the elastic ball during self-cleaning of the screen, and uses the inertia of the screen to discharge the metal silicon powder stuck in the screen hole. If the friction force between part of the silicon powder and the screen mesh is greater than the inertia force of the screen, this part of the silicon powder is not only not discharged from the screen mesh, but even when the screen is reset, the inertia of the screen reset causes this part of the silicon powder to be more tightly connected to the screen mesh, making it more difficult to discharge this part of the silicon powder outward, further aggravating the blockage of the screen mesh, and the self-cleaning property of the screen is poor.

[0006] When the above-mentioned prior art is used to self-clean the screen after urea screening, the above-mentioned problems still exist.

[0007] 2. Since the surface of silicon powder is absorbent, it may gather into clumps during screening. If it is not crushed, the silicon powder that has gathered into clumps cannot be screened. If there is moisture on the surface of the silicon powder, it may adhere to the screen. Over time, silicon powder will accumulate more and more at the bonding point of the screen, affecting the subsequent screening effect of the silicon powder.

[0008] Urea itself also has the above-mentioned properties of silicon powder, so the above-mentioned problems also exist in the screening process of urea. Summary of the invention

[0009] In order to solve the above technical problems, the present application provides a self-cleaning urea granule screening device and a cleaning assembly, which adopts the following technical solutions:

[0010] In a first aspect, a self-cleaning urea granule screening device comprises two symmetrically distributed vertical plates, a screening plate is installed between the two vertical plates, and a crushing mechanism and a self-cleaning mechanism are installed on the two vertical plates.

[0011] The self-cleaning mechanism comprises: a cleaning brush, which is arranged between the opposite surfaces of the two vertical plates and is slidably arranged along the screening plate.

[0012] The movable frame is arranged above the two vertical plates, and the two ends of the movable frame are respectively slidably matched with the top of the vertical plates on the corresponding sides.

[0013] The linkage frame is symmetrically arranged along the width direction of the screening plate, and the bottom end of the linkage frame is installed on the cleaning brush, and the top end of the linkage frame passes through the moving frame.

[0014] The swing assembly is installed on the moving frame and the vertical plate, and is used to drive the linkage frame to swing back and forth along the length direction of the screening plate.

[0015] Preferably, the pulverizing mechanism comprises: a pulverizing box having a cavity formed therein and penetrating along the height direction of the vertical plate.

[0016] The crushing rollers are arranged inside the cavity and are provided in two groups along the height direction of the crushing box. Each group of crushing rollers is symmetrically distributed along the width direction of the crushing box, and the crushing rollers are installed on the inner wall of the cavity through bearings.

[0017] The crushing assembly is installed on the crushing roller and the inner wall of the cavity.

[0018] Preferably, the pulverizing assembly comprises: a plurality of stirring protrusions which are evenly installed on the circumferential surface of each pulverizing roller.

[0019] The guide plate is obliquely installed inside the cavity and corresponds to the crushing rollers one by one. The guide plate is provided with a giving way groove for giving way to the toggle protrusion.

[0020] The shaft head of any one of the crushing rollers penetrates the crushing box body.

[0021] Preferably, the crushing box is provided with a fixed frame on the side wall through which the crushing roller shaft head passes, and a bidirectional screw extending along the length direction of the vertical plate is rotatably installed on the fixed frame through a bearing, and a linkage frame is installed on the movable frame, and one end of the bidirectional screw away from the fixed frame is connected to the linkage frame by a threaded transmission, and the bidirectional screw is connected to the crushing roller shaft head passing through the crushing box by a bevel gear transmission.

[0022] Preferably, the swing assembly includes: a swing shaft extending along the length direction of the mobile frame and symmetrically arranged along the length direction of the mobile frame, the mobile frame is provided with a through groove matching the linkage frame, and the swing shaft is installed on the inner wall of the through groove through a bearing.

[0023] The limit blocks are symmetrically arranged along the length direction of the moving frame and are slidably arranged on the linkage frame. One end of the swing shaft away from the corresponding through slot is installed on the corresponding limit block through a bearing.

[0024] The fixed connecting frame is installed on the side of the mobile frame close to the crushing box.

[0025] The rotating connecting shaft is rotatably installed on the fixed connecting frame through the bearing.

[0026] The cam 1 is mounted on the rotating shaft and cooperates with the linkage frame.

[0027] Preferably, a gear 1 is installed at one end of the rotating shaft away from the cam, and a rack plate meshing with the gear 1 is installed on the vertical plate.

[0028] Preferably, a driving shaft is installed on the vertical plate on the same side as the bidirectional screw through a bearing, a driving motor is installed on the driving shaft, a movable vertical plate is slidably arranged through the vertical plate on which the driving shaft is installed, and the end of the movable vertical plate close to the screening plate is installed on the screening plate, a vertical connecting frame is installed on the end of the movable vertical plate away from the screening plate, a horizontal connecting frame is installed on the vertical connecting frame, and a cam 2 matching the horizontal connecting frame is installed on the driving shaft.

[0029] In a second aspect, a cleaning assembly is provided, wherein a movable plate moving along the bottom of the screening plate is slidably arranged between the vertical plates, and a plurality of pulling rods are evenly installed on the movable plate along its length direction.

[0030] Preferably, the two vertical plates are both equipped with connecting protrusions, and a winding shaft is commonly installed on the two connecting protrusions, a traction rope is wound on the winding shaft, the end of the traction rope away from the winding shaft is installed on the movable plate, a ratchet is installed on the end of the winding shaft close to the second cam, and a pawl matching the ratchet is installed on the vertical plate on which the drive shaft is installed.

[0031] Preferably, a driving coupling is installed on the vertical plate on the same side as the bidirectional screw, a linkage gear is installed on the driving coupling, an incomplete gear meshing with the linkage gear is installed on the driving shaft, and the winding shaft and the driving coupling are connected by belt drive.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. In the self-cleaning mechanism designed in the present invention, the cleaning brush can clean the urea granules adhered to the screen plate during its movement along the screen plate, so as to prevent the surface of the urea granules from getting damp and adhering to the screen plate, resulting in the accumulation of urea granules on the screen plate and blocking of the mesh of the screen plate, thereby improving the screening efficiency of the screen plate. At the same time, the cleaning brush can slow down and hinder the urea granules during the screening process, thereby preventing the urea granules from falling too quickly on the screen plate, resulting in the possibility that the urea granules fall directly to the outside of the device without being screened by the mesh of the screen plate, thereby improving the screening effect of the urea granules.

[0034] 2. In the cleaning assembly designed by the present invention, the sieve plate moves back and forth along the height direction of the vertical plate, and the movable plate cooperates with the insertion and extraction rod to discharge the urea particles stuck inside the mesh of the sieve plate outward, thereby preventing the urea particles from clogging the mesh of the sieve plate and improving the effect of urea particles that meet the mesh diameter of the sieve plate passing through the mesh of the sieve plate.

[0035] 3. The cleaning brush designed in the present invention can also swing back and forth around the swing axis when cleaning the surface of the screen plate. During the reciprocating swinging process, the cleaning brush can also apply external force to the stubborn urea particles adhering to the screen plate, so that the stubborn urea particles adhering to the screen plate can be separated from the screen plate, thereby improving the cleaning effect of the cleaning brush on the screen plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0037] Figure 2 It is a schematic diagram of the three-dimensional installation structure between the drill crushing box, crushing roller and guide plate of the present invention.

[0038] Figure 3 It is a schematic diagram of the three-dimensional installation structure between the drive shaft, the drive motor and the movable vertical plate of the present invention.

[0039] Figure 4 The present invention Figure 3 A partial enlarged view of point A.

[0040] Figure 5 The present invention Figure 3 A partial enlarged view of point B.

[0041] Figure 6It is a schematic diagram of the three-dimensional installation structure between the movable plate, the vertical plate and the insertion rod etc. of the present invention.

[0042] Figure 7 The present invention Figure 6 A partial enlarged view of point C.

[0043] Figure 8 The present invention Figure 6 A partial enlarged view of point D.

[0044] Explanation of reference numerals: 1. vertical plate; 11. driving shaft; 12. driving motor; 13. moving vertical plate; 14. vertical connecting frame; 15. horizontal connecting frame; 16. cam 2; 2. screening plate; 3. crushing mechanism; 31. crushing box; 311. fixed frame; 312. bidirectional screw; 313. linkage connecting frame; 32. crushing roller; 33. crushing assembly; 331. toggle protrusion; 332. guide plate; 4. self-cleaning Mechanism; 41. Cleaning brush; 42. Moving frame; 43. Linkage frame; 44. Swinging assembly; 441. Swinging shaft; 442. Limit block; 443. Fixed link frame; 444. Rotating coupling; 445. Cam 1; 446. Gear 1; 447. Rack plate; 5. Moving plate; 51. Pull-in rod; 52. Winding shaft; 53. Traction rope; 54. Driving coupling; 55. Linkage gear; 56. Incomplete gear. DETAILED DESCRIPTION

[0045] The following is combined with Figures 1 to 8 This application is described in further detail.

[0046] The embodiment of the present application discloses a self-cleaning urea granule screening device and a cleaning component, which can crush the urea granules before screening, and can also perform self-cleaning treatment on the screening plate while screening the urea granules, and clean the screening plate after the urea granule screening is completed.

[0047] Embodiment 1:

[0048] See also Figure 1 A self-cleaning urea granule screening device comprises two symmetrically distributed vertical plates 1, a screening plate 2 is installed between the two vertical plates 1, and a plurality of sieve holes are evenly opened, and a crushing mechanism 3 and a self-cleaning mechanism 4 are installed on the two vertical plates 1.

[0049] See also Figure 2 The crushing mechanism 3 includes: a crushing box 31, which has a cavity that penetrates along the height direction of the vertical plate 1.

[0050] The crushing rollers 32 are arranged inside the cavity and two groups are arranged along the height direction of the crushing box 31. Each group of crushing rollers 32 is symmetrically distributed along the width direction of the crushing box 31, and the crushing rollers 32 are installed on the inner wall of the cavity through bearings.

[0051] The crushing assembly 33 is installed on the crushing roller 32 and the inner wall of the cavity.

[0052] In order to avoid using an external drive to drive the urea particles to move on the screening plate 2, the screening plate 2 provided by the present invention is provided with an inclined structure, so that when the urea particles fall on the screening plate 2, they can move on the screening plate 2 by their own gravity; in order to avoid the problem that the agglomerated urea particles are not completely crushed due to the large spacing between each group of crushing rollers 32, and the agglomerated urea particles cannot pass between the crushing rollers 32 due to the small spacing between each group of crushing rollers 32, the spacing between each group of crushing rollers 32 decreases from top to bottom, so that the agglomerated urea particles can be crushed in stages, the crushing effect of the urea particles is improved, and preparations are made for the subsequent urea particle screening. The upper and lower adjacent crushing rollers 32 are connected to each other by a belt drive (not shown in the figure), and the rotation directions of each group of crushing rollers 32 are opposite.

[0053] During specific operation, urea granules are poured into the crushing box 31, and the existing driving motor 12 drives the crushing rollers 32 to rotate. The crushing rollers 32 are mutually transmitted by belt transmission. At this time, the crushing rollers 32 rotate, and the two upper crushing rollers 32 can give the poured urea granules a downward force during the rotation process, so that the urea granules enter between the upper crushing rollers 32 for coarse crushing, and the urea granules crushed by the upper crushing rollers 32 continue to fall downward to between the lower crushing rollers 32 for fine crushing, and then the agglomerated urea granules can be fully crushed by graded crushing.

[0054] A guide connecting plate is installed at the lower side of the crushing box 31, and the crushed urea particles can fall onto the screening plate 2 through the guide connecting plate to prevent the urea particles from falling directly on the screening plate 2, causing the urea particles to bounce upward and then splash around. A splash plate is also installed between the two vertical plates 1 to prevent the urea particles that fall on the guide connecting plate from splashing around, and to limit the urea particles that fall on the guide connecting plate, so that the crushed urea particles fall completely on the screening plate 2.

[0055] Continue reading Figure 2 In order to further ensure that the urea particles can smoothly enter between the crushing rollers 32, the present invention also provides a guide plate 332 to solve the above problem. Specifically, the crushing assembly 33 includes: a plurality of moving protrusions 331 are provided and evenly installed on the circumferential surface of each crushing roller 32.

[0056] The guide plate 332 is obliquely installed inside the cavity and corresponds to the crushing roller 32 one by one. The guide plate 332 is provided with a recess for making way for the toggle protrusion 331 .

[0057] The shaft head of any one of the crushing rollers 32 penetrates the crushing box 31 .

[0058] During specific operation, compared with the smooth crushing roller 32, the friction between the agglomerated urea particles and the agglomerated urea particles can be increased by moving the protrusion 331 during the rotation of the crushing roller 32, and then the agglomerated urea particles can cooperate with the moving protrusion 331 during the rotation of the crushing roller 32 to make the agglomerated urea particles enter between the crushing rollers 32 more smoothly, thereby avoiding the agglomerated urea particles from sliding relative to each other on the crushing roller 32, wherein the guide plate 332 can guide the urea particles falling into the crushing box 31, avoiding the urea particles from falling downward from the gap between the crushing roller 32 and the crushing box 31, thereby improving the crushing effect of the urea particles.

[0059] Since the surface of the agglomerated urea particles may be wet, the urea particles may adhere to the crushing roller 32, wherein the guide plate 332 may also be close to the crushing roller 32, and then during the rotation of the crushing roller 32, the guide plate 332 may also clean the urea particles adhered to the crushing roller 32 to avoid the urea particles adhering to the crushing roller 32, which may increase the thickness of the crushing roller 32 and reduce the distance between the crushing rollers 32, thereby affecting the crushing effect of the crushing roller 32 on the urea particles. The yielding groove may give way to the toggle protrusion 331 to avoid the collision between the toggle protrusion 331 and the guide plate 332.

[0060] See also Figure 3 as well as Figure 4 The self-cleaning mechanism 4 includes: a cleaning brush 41, which is arranged between the opposite surfaces of the two vertical plates 1 and is slidably arranged along the screening plate 2.

[0061] The movable frame 42 is disposed above between the two vertical plates 1, and both ends thereof are respectively slidably matched with the top of the vertical plates 1 on the corresponding sides.

[0062] The linkage frame 43 is symmetrically arranged along the width direction of the screening plate 2 , and the bottom end of the linkage frame 43 is installed on the cleaning brush 41 , and the top end of the linkage frame 43 passes through the moving frame 42 .

[0063] The swing assembly 44 is installed on the moving frame 42 and the vertical plate 1, and is used to drive the linkage frame 43 to swing back and forth along the length direction of the screening plate 2.

[0064] Since the screening plate 2 is inclined, when the cleaning brush 41 moves, it drives the linkage frame 43 to slide up and down on the moving frame 42. During specific operation, the moving frame 42 is driven to move by the existing drive (cylinder, etc.), and the linkage frame 43 is driven to move during the movement of the moving frame 42. The cleaning brush 41 can clean the urea particles adhering to the screening plate 2 during the movement along the screening plate 2 to prevent the surface of the urea particles from getting damp and adhering to the screening plate 2, resulting in the accumulation of urea particles on the screening plate 2 and the clogging of the mesh of the screening plate 2, so that the inside of the device can be self-cleaned and the screening efficiency of the screening plate 2 is improved at the same time. The cleaning brush 41 can also slow down and hinder the urea particles during the screening process to prevent the urea particles from falling too fast on the screening plate 2, resulting in the possibility that the urea particles fall directly to the outside of the device without being screened by the mesh of the screening plate 2, thereby improving the screening effect of the urea particles.

[0065] At the same time, the cleaning brush 41 can also spread the urea particles that fall on the sieve plate 2 during the reciprocating movement, so as to avoid the problem of uneven distribution of the urea particles on the sieve plate 2 caused by the urea particles falling too fast.

[0066] See also Figure 3 In order to reduce the use of existing drives, the present invention provides a bidirectional screw 312 to solve the above problems. Specifically, a fixed frame 311 is installed on the side wall of the crushing box 31 and the shaft head of the crushing roller 32 passes through. A bidirectional screw 312 extending along the length direction of the vertical plate 1 is rotatably installed on the fixed frame 311 through a bearing. A linkage frame 313 is installed on the mobile frame 42, and one end of the bidirectional screw 312 away from the fixed frame 311 is connected to the linkage frame 313 through a threaded transmission method, and the bidirectional screw 312 is connected to the shaft head of the crushing roller 32 passing through the crushing box 31 through a bevel gear transmission method.

[0067] During specific operation, the crushing roller 32 passing through the crushing box 31 drives the bidirectional screw 312 to rotate through the bevel gear transmission. During the rotation of the bidirectional screw 312, the movable frame 42 is driven to reciprocate on the vertical plate 1 through the linkage frame 313, so that the movable frame 42 can be driven to move on the vertical plate 1 without using an external drive, thereby reducing the cost of the device.

[0068] See also Figure 4In order to improve the cleaning effect of the cleaning brush 41 on the stubborn urea particles on the screening plate 2, the swing assembly 44 provided by the present invention can drive the cleaning brush 41 to swing back and forth along the screening plate 2, and then the reciprocatingly swinging cleaning brush 41 can give an external force to the urea particles, thereby accelerating the process of the urea particles separating from the screening plate 2. Specifically, the swing assembly 44 includes: a swing shaft 441, which extends along the length direction of the moving frame 42 and is symmetrically arranged along the length direction of the moving frame 42, and the moving frame 42 is provided with a through groove matched with the linkage frame 43, and the swing shaft 441 is installed on the inner wall of the through groove through a bearing.

[0069] The limit blocks 442 are symmetrically arranged along the length direction of the moving frame 42 and are slidably arranged on the linkage frame 43. One end of the swing shaft 441 away from the corresponding through slot is installed on the corresponding limit block 442 through a bearing.

[0070] The fixed connecting frame 443 is installed on one side of the movable frame 42 close to the crushing box 31 .

[0071] The rotating connecting shaft 444 is rotatably mounted on the fixed connecting frame 443 through a bearing.

[0072] Cam 1 445 is mounted on the rotating shaft 444 and cooperates with the linkage frame 43.

[0073] During specific operation, the existing drive drives the rotating connecting shaft 444 to rotate, and the rotating connecting shaft 444 drives the cam 445 to rotate during the rotation. When the part of the cam 445 that is in contact with the linkage frame 43 moves from its short semi-axis to the long semi-axis, the cam 445 drives the linkage frame 43 to rotate around the swing shaft 441 to the side away from the crushing box 31. When the part of the cam 445 that is in contact with the linkage frame 43 moves from its long semi-axis to the short semi-axis, the cam 445 is reset and disengaged from the linkage frame 43. At this time, the linkage frame 43 moves to one side of the crushing box 31 due to inertia, and then the cam 445 drives the linkage frame 43 to swing back and forth during the rotation of the cam 445. The cleaning brush 41 is driven to swing back and forth along the screening plate 2 during the reciprocating swing of the linkage frame 43, and then the reciprocating swinging cleaning brush 41 can give an external force to the urea particles, thereby accelerating the separation process of the urea particles from the screening plate 2.

[0074] The limit block 442 allows the swing shaft 441 and the linkage frame 43 to slide relative to each other, thereby preventing a rigid impact between the swing shaft 441 and the linkage frame 43 when the cleaning brush 41 drives the linkage frame 43 to move up and down on the moving frame 42, thereby affecting the reciprocating swing effect of the linkage frame 43.

[0075] Continue reading Figure 4In order to reduce the use of existing drives, the gear 1 446 and the rack plate 447 provided by the present invention cooperate with each other to provide driving force for the rotating shaft 444. Specifically, a gear 1 446 is installed at one end of the rotating shaft 444 away from the cam, and a rack plate 447 meshing with the gear 1 446 is installed on the vertical plate 1.

[0076] During specific operation, the movable frame 42 moves and synchronously drives the rotating coupling 444 to rotate. During the rotation of the rotating coupling 444, the gear 1 446 and the rack plate 447 are engaged with each other to drive the rotating coupling 444 to rotate. At this time, the rotating coupling 444 can rotate without external force, which effectively saves the cost of the device.

[0077] The urea particles falling on the screening plate 2 can then be screened, wherein a collecting frame (not shown in the figure) for containing the urea particles is provided between the vertical plates 1 and at the bottom of the screening plate 2 .

[0078] Example 2: Reference Figure 3 On the basis of the first embodiment, the present invention also provides a screening plate 2 which can reciprocate up and down. Specifically, a driving shaft 11 is installed on the vertical plate 1 on the same side as the bidirectional screw 312 through a bearing, and a driving motor 12 is installed on the driving shaft 11. A movable vertical plate 13 is slidably arranged through the vertical plate 1 on which the driving shaft 11 is installed, and one end of the movable vertical plate 13 close to the screening plate 2 is installed on the screening plate 2, and one end of the movable vertical plate 13 away from the screening plate 2 is installed with a vertical connecting frame 14, and a horizontal connecting frame 15 is installed on the vertical connecting frame 14, and a cam 16 matching the horizontal connecting frame 15 is installed on the driving shaft 11.

[0079] During specific operation, the drive motor 12 is started, and the output shaft of the drive motor 12 drives the cam 16 to rotate during rotation. During the rotation of the cam 16, the horizontal connecting frame 15 cooperates with the vertical connecting frame 14 to drive the movable vertical plate 13 to move back and forth up and down. During the reciprocating movement of the movable vertical plate 13, the screening plate 2 is driven to move back and forth up and down. The screening plate 2 can have a certain inertia during the reciprocating movement up and down, and then due to the action of inertia, the urea particles adhered to the screening plate 2 can also fall off the screening plate 2, thereby preventing the surface of the urea particles from getting damp and adhering to the screening plate 2, resulting in the accumulation of urea particles on the screening plate 2 and causing the mesh of the screening plate 2 to be blocked, so that the inside of the device can be self-cleaning.

[0080] The screening plate 2 is provided with a plurality of arc-shaped strips evenly along its length direction, which are used to decelerate the urea particles falling on the screening plate 2 during the reciprocating vibration of the screening plate 2, thereby preventing the urea particles from falling too fast on the screening plate 2 and causing the urea particles to fall directly to the outside of the device without being screened by the mesh of the screening plate 2, thereby improving the screening effect of the urea particles.

[0081] Finally, see Figures 5 to 8In order to prevent the mesh of the screening plate 2 from being blocked, the present invention further provides a cleaning assembly. Specifically, a movable plate 5 that moves along the bottom of the screening plate 2 is slidably arranged between the vertical plates 1, and a plurality of insertion rods 51 are evenly installed on the movable plate 5 along its length direction.

[0082] Both vertical plates 1 are equipped with connecting protrusions, and a winding shaft 52 is installed on the two connecting protrusions. A traction rope 53 is wound on the winding shaft 52. The end of the traction rope 53 away from the winding shaft 52 is installed on the movable plate 5. A ratchet is installed on the end of the winding shaft 52 close to the cam 16. A pawl matching with the ratchet is installed on the vertical plate 1 equipped with the driving shaft 11. The ratchet and the pawl cooperate with each other to limit the winding shaft 52.

[0083] A driving coupling 54 is also installed on the vertical plate 1 on the same side as the bidirectional screw 312, and a linkage gear 55 is installed on the driving coupling 54. An incomplete gear 56 meshing with the linkage gear 55 is also installed on the driving shaft 11, and the winding shaft 52 and the driving coupling 54 are connected by belt drive.

[0084] At the starting position, the insertion rod 51 is located inside the mesh at the bottom of the screening plate 2. During specific operation, when the screening plate 2 screens urea particles, the driving shaft 11 drives the cam 16 to rotate during its rotation. When the part of the cam 16 that contacts the horizontal frame moves from the short half section to the long half section, the horizontal frame moves up, and the screening plate 2 moves up synchronously. The screening plate 2 just disengages from the insertion rod 51. At this time, the driving shaft 11 drives the incomplete gear 56 to mesh with the linkage gear 55 to cooperate with each other to drive the driving coupling 54 to rotate. During the rotation of the driving coupling 54, the winding shaft 52 is driven to rotate through a belt transmission method. During the rotation of the winding shaft 52, the traction rope 53 is wound. At this time, the winding shaft 5 2 rotates a certain number of circles and drives the movable plate 5 to move a certain distance along the screening plate 2 (this distance is the distance between two adjacent groups of sieve holes along the length direction of the screening plate 2). At this time, the insertion rod 51 is aligned with the new sieve hole. After a period of time after the movable plate 5 moves to the next group of sieve holes, the part of the cam 16 that contacts the horizontal frame moves from the long half section to the short half section. At this time, the screening plate 2 is reset, and then the insertion rod 51 is reinserted into the new sieve hole. During the insertion process of the insertion rod 51, the urea particles blocked in the new sieve hole can be discharged outward, and then the above actions can be repeated to remove the urea particles remaining stuck in the sieve hole during the screening process, thereby improving the screening effect of the screening plate 2.

[0085] When the moving plate 5 moves to the top of the screening plate 2, the ratchet is removed and the driving motor 12 is turned off, and the moving plate 5 is reset due to gravity.

[0086] After the use of the sieve plate 2 is over, the sieve plate 2 can be cleaned by repeating the above-mentioned cleaning process of the sieve holes by the movable plate 5 and the insertion rod 51 to prevent the urea particles remaining in the sieve holes from affecting the next use.

[0087] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0088] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A self-cleaning urea granule screening device, comprising two symmetrically distributed vertical plates, characterized in that: A screening plate is installed between the two vertical plates, and a crushing mechanism and a self-cleaning mechanism are installed on the two vertical plates, wherein: The self-cleaning mechanism comprises: A cleaning brush is arranged between opposite surfaces of the two vertical plates and is slidably arranged along the screening plate; The movable frame is arranged above the two vertical plates, and its two ends are respectively slidably matched with the top of the vertical plates on the corresponding sides; The linkage frame is symmetrically arranged along the width direction of the screening plate, and the bottom end of the linkage frame is installed on the cleaning brush, and the top end of the linkage frame passes through the moving frame; The swing assembly is installed on the moving frame and the vertical plate, and is used to drive the linkage frame to swing back and forth along the length direction of the screening plate; The swing assembly comprises: The swing shaft extends along the length direction of the moving frame and is symmetrically arranged along the length direction of the moving frame. The moving frame is provided with a through groove matched with the linkage frame, and the swing shaft is installed on the inner wall of the through groove through a bearing; The limit blocks are symmetrically arranged along the length direction of the moving frame and are slidably arranged on the linkage frame, and one end of the swing shaft away from the corresponding through slot is installed on the corresponding limit block through a bearing; The fixed connecting frame is installed on the side of the mobile frame close to the crushing box; The rotating shaft is rotatably mounted on the fixed connecting frame through the bearing; Cam 1, mounted on the rotating shaft and cooperating with the linkage frame; A gear one is installed on the end of the rotating shaft away from the cam one, and a rack plate meshing with the gear one is installed on the vertical plate.

2. A self-cleaning urea granule screening device according to claim 1, characterized in that: The crushing mechanism comprises: A crushing box, which has a cavity extending in the height direction of the vertical plate; Crushing rollers are arranged inside the cavity and are provided in two groups along the height direction of the crushing box. Each group of crushing rollers is symmetrically distributed along the width direction of the crushing box, and the crushing rollers are installed on the inner wall of the cavity through bearings; The crushing assembly is installed on the crushing roller and the inner wall of the cavity.

3. A self-cleaning urea granule screening device according to claim 2, characterized in that: The crushing assembly comprises: The toggle protrusions are provided in plurality and are evenly installed on the circumferential surface of each crushing roller; The guide plate is obliquely installed inside the cavity and corresponds to the crushing roller one by one. The guide plate is provided with a recess for making way for the toggle protrusion; The shaft head of any one of the crushing rollers penetrates the crushing box body.

4. A self-cleaning urea granule screening device according to claim 3, characterized in that: The crushing box is provided with a fixed frame on the side wall through which the crushing roller shaft head passes, and a bidirectional screw extending along the length direction of the vertical plate is rotatably installed on the fixed frame through a bearing, and a linkage frame is provided on the movable frame, and one end of the bidirectional screw away from the fixed frame is connected to the linkage frame through a threaded transmission, and the bidirectional screw is connected to the crushing roller shaft head passing through the crushing box through a bevel gear transmission.

5. A self-cleaning urea granule screening device according to claim 4, characterized in that: A driving shaft is installed on the vertical plate on the same side of the bidirectional screw through a bearing, and a driving motor is installed on the driving shaft. A movable vertical plate is slidably arranged through the vertical plate on which the driving shaft is installed, and the end of the movable vertical plate close to the screening plate is installed on the screening plate, and a vertical connecting frame is installed on the end of the movable vertical plate away from the screening plate, and a horizontal connecting frame is installed on the vertical connecting frame, and a cam 2 matching the horizontal connecting frame is installed on the driving shaft.

6. A cleaning assembly, comprising the self-cleaning urea granule screening device according to claim 5, characterized in that: A movable plate moving along the bottom of the screening plate is slidably arranged between the vertical plates, and a plurality of insertion and withdrawal rods are evenly installed on the movable plate along its length direction.

7. A cleaning assembly according to claim 6, characterized in that: The two vertical plates are both equipped with connecting protrusions, and a winding shaft is commonly installed on the two connecting protrusions. A traction rope is wound on the winding shaft. The end of the traction rope away from the winding shaft is installed on the movable plate. A ratchet is installed on the end of the winding shaft close to the second cam, and a pawl matching the ratchet is installed on the vertical plate on which the drive shaft is installed.

8. A cleaning assembly according to claim 7, characterized in that: A driving coupling is also installed on the vertical plate on the same side as the bidirectional screw, a linkage gear is installed on the driving coupling, an incomplete gear meshing with the linkage gear is also installed on the driving shaft, and the winding shaft and the driving coupling are connected by belt transmission.

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