Drum screening machine for chemical fertilizer production
The drum screening machine, with its inner and outer mesh cylinder structure and brush roller design, solves the problems of poor screening effect and interference with disc granulators in fertilizer production, achieving efficient screening and granulation, and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG XINHENGYUAN MASCH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-05-29
AI Technical Summary
Existing rotary drum screens used in fertilizer production have poor screening performance, cannot effectively process fertilizer particles that do not meet particle size requirements, and interfere with the normal granulation process of disc granulators.
A rotary drum screen for fertilizer production was designed, which adopts an inner and outer screen structure. The inner and outer screens screen fertilizer particles of different sizes, and the brush rollers clean blockages. The particles in the collection hopper are crushed to reduce the impact on the disc granulator.
It achieves efficient screening of fertilizer granules, avoids screen clogging, improves screening effect, reduces interference with disc granulators, and improves production efficiency.
Smart Images
Figure CN224293843U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of fertilizer production equipment, and more specifically, it relates to a drum screening machine for fertilizer production. Background Technology
[0002] In fertilizer production, disc granulators are sometimes used for granulation. During granulation, some fertilizer particles that do not meet the required size may remain in the granulated product. Currently, fertilizer manufacturers sometimes directly feed the granulated fertilizer particles to vibrating screens or drum screens for screening. While vibrating screens have a larger screening capacity per unit time, current drum screens used in fertilizer production often only have one layer of screen. This means they can generally only screen out smaller fertilizer particles, leaving larger particles unscreened. Furthermore, fertilizer manufacturers often directly feed these small fertilizer particles back into the disc granulator, which interferes with the normal granulation process. Summary of the Invention
[0003] The purpose of this utility model is to provide a rotary drum screen for fertilizer production, so as to overcome the problems of poor screening effect and inability to process the screened fertilizer particles in the existing rotary drum screens for fertilizer production.
[0004] This utility model is achieved using the following technical solution: a rotary drum screen for fertilizer production, comprising a first support frame, on which an outer screen cylinder is rotatably mounted. The outer screen cylinder is driven to rotate by a reduction motor. An inner screen cylinder is installed inside the outer screen cylinder, and the outer and inner screen cylinders are connected by a connecting rib. A sleeve is fitted on the outer side of the outer screen cylinder, and the sleeve is fixedly mounted on a second support frame. A collecting hopper is installed at the bottom of the sleeve, and a collecting hopper outlet is opened at the bottom of the collecting hopper. A crusher is arranged below the collecting hopper outlet. The rear end of the inner screen cylinder extends backward out of the outer screen cylinder, and a discharge hopper is arranged below the inner screen cylinder. The discharge hopper is connected to the collecting hopper through a discharge pipe.
[0005] Furthermore, the first support frame has a feed pipe fixedly installed at the feed end, and the lower end of the feed pipe is inserted into the inner mesh cylinder.
[0006] Furthermore, a feed hopper is installed at the top of the feed pipe.
[0007] Furthermore, the first support frame is equipped with a third support frame on both sides of the outer mesh cylinder, and a first brush roller and a second brush roller are installed vertically between the two third support frames. The first brush roller and the second brush roller are respectively equipped with brush bristles. The first brush roller is inserted into the upper side between the outer mesh cylinder and the sleeve, and the brush bristles on the first brush roller are in contact with the outer mesh cylinder. The second brush roller is inserted into the upper side inside the inner mesh cylinder, and the brush bristles on the second brush roller are in contact with the inner mesh cylinder.
[0008] Furthermore, the two ends of the first brush roller are rotatably connected to the third support frames on both sides via bearings, and the two ends of the second brush roller are rotatably connected to the third support frames on both sides via bearings.
[0009] Furthermore, a first conveyor is installed on the lower side of the discharge port of the outer mesh cylinder.
[0010] Furthermore, a second conveyor is installed below the discharge port of the crusher.
[0011] Furthermore, both the outer and inner mesh cylinders are inclined downwards along the direction from the feed end to the discharge end.
[0012] Furthermore, a vibrating motor is installed on the hopper.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. This utility model can separate large and small fertilizer particles that do not meet the particle size requirements after granulation. The sieving effect of this model is better than that of current fertilizer drum screens. During sieving, the granulated fertilizer particles are first conveyed to the inner screen cylinder through the feed hopper and feed pipe. The outer screen cylinder is driven to rotate by a reduction motor. The outer and inner screen cylinders rotate synchronously, and both are inclined downwards from the feed end to the discharge end. The mesh size of the outer screen cylinder is... As the fertilizer granules rotate and move within the inner cylinder, those that meet the size requirements and those that do not are allowed to leak from the inner cylinder's mesh into the outer cylinder. Meanwhile, within the outer cylinder, smaller granules that do not meet the size requirements leak from the outer cylinder's mesh into the sleeve and enter the collection hopper at the bottom of the sleeve. Larger granules that do not meet the size requirements eventually fall into the discharge hopper, while granules that meet the size requirements fall onto the first conveyor.
[0015] 2. This utility model can crush fertilizer particles in the hopper. When in use, the fertilizer particles in the hopper will enter the crusher under the action of gravity and the vibration of the vibrating motor. The crushed fertilizer particles will become particles with a particle size equivalent to the granulation raw material. In this way, when the fertilizer particles that do not meet the particle size requirements screened by this utility model are re-transported to the disc granulator for granulation, the impact on the normal granulation process of the disc granulator can be reduced.
[0016] 3. This utility model can effectively prevent clogging of the inner and outer mesh cylinders. By inserting the first brush roller into the upper side between the outer mesh cylinder and the sleeve, with the bristles on the first brush roller in contact with the outer mesh cylinder, and inserting the second brush roller into the upper side inside the inner mesh cylinder, with the bristles on the second brush roller in contact with the inner mesh cylinder, the bristles on the first brush roller will effectively clean the clogging material on the outer mesh cylinder, and the bristles on the second brush roller will effectively clean the clogging material on the inner mesh cylinder. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 and Figure 3 These are perspective views of this utility model.
[0019] In the diagram: 1. First support frame; 2. Outer mesh cylinder; 3. Gear motor; 4. Inner mesh cylinder; 5. Connecting rib; 6. Sleeve; 7. Second support frame; 8. Collection hopper; 9. Collection hopper outlet; 10. Crusher; 11. Discharge hopper; 12. Discharge pipe; 13. Feed pipe; 14. Feed hopper; 15. Third support frame; 16. First brush roller; 17. Second brush roller; 18. First conveyor; 19. Second conveyor; 20. Vibrating motor. Detailed Implementation
[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the scope of protection of this utility model.
[0021] A rotary drum screen for fertilizer production includes a first support frame 1, on which an outer screen cylinder 2 is rotatably mounted. The outer screen cylinder 2 is driven to rotate by a reduction motor 3, a mature existing technology with various driving structures. One driving structure is described in the accompanying drawings of this utility model. Annular grooves are respectively provided at both ends of the outer screen cylinder 2. Support wheels are respectively provided on both sides of the annular groove near the discharge end of the outer screen cylinder 2, and the discharge end support wheel is in the discharge end annular groove and in contact with it. The outer mesh cylinder 2 is rotatably connected to the first support frame 1 via bearing seats on both sides. Support wheels and drive wheels are respectively provided on both sides of the annular groove near the feeding end of the outer mesh cylinder 2. Both sides of the support wheel and the drive wheel at the feeding end are rotatably connected to the first support frame 1 via bearing seats. The support wheel and the drive wheel at the feeding end are inserted into the annular groove at the feeding end and are in contact with the annular groove at the feeding end. The drive wheel is connected to the reduction motor 3. In application, the reduction motor 3 drives the drive wheel to rotate. The drive wheel drives the outer mesh cylinder 2 to rotate through friction. Both the support wheel and the drive wheel can be made of rubber.
[0022] An inner mesh cylinder 4 is installed inside the outer mesh cylinder 2, and the outer mesh cylinder 2 and the inner mesh cylinder 4 are connected by connecting ribs 5. The inner mesh cylinder 4 is inserted into the outer mesh cylinder 2, and the outer mesh cylinder 2 is connected to the inner mesh cylinder 4 by multiple connecting ribs 5, forming a single unit. When the outer mesh cylinder 2 rotates, the inner mesh cylinder 4 rotates synchronously. Both the outer mesh cylinder 2 and the inner mesh cylinder 4 have mesh holes, with the mesh hole size of the inner mesh cylinder 4 being larger than that of the outer mesh cylinder 2. When fertilizer granules to be screened are conveyed into the inner mesh cylinder 4, fertilizer granules that meet the particle size requirements and those with smaller particle sizes will fall from the inner mesh cylinder 4 into the outer mesh cylinder 2. Then, small fertilizer granules that do not meet the particle size requirements in the outer mesh cylinder 2 will fall from the outer mesh cylinder 2 into the sleeve 6. Both the outer mesh cylinder 2 and the inner mesh cylinder 4 are inclined downwards along the direction from the feed end to the discharge end, which facilitates the movement of fertilizer particles in the outer mesh cylinder 2 and the inner mesh cylinder 4 from the feed end to the discharge end.
[0023] The first support frame 1 has a feed pipe 13 fixedly installed at the feed end. The lower end of the feed pipe 13 is inserted into the inner mesh cylinder 4, and a feed hopper 14 is installed at the top of the feed pipe 13. In application, the fertilizer granules to be screened are first conveyed into the feed hopper 14, and then the fertilizer granules in the feed hopper 14 enter the inner mesh cylinder 4 through the feed pipe 13.
[0024] A sleeve 6 is fitted around the outer side of the outer mesh cylinder 2, through which the outer mesh cylinder 2 passes, without contacting the sleeve 6. The sleeve 6 is fixedly mounted on the second support frame 7, which is relatively independent of the first support frame 1. By setting the sleeve 6 and allowing the outer mesh cylinder 2 to pass through it, this invention prevents materials from fertilizer granules from falling into the workshop.
[0025] The bottom of the sleeve 6 is equipped with a collection hopper 8, and the bottom of the collection hopper 8 has a collection hopper outlet 9. Small granular fertilizer particles that do not meet the particle size requirements screened by the outer screen cylinder 2 will fall into the sleeve 6 and from the sleeve 6 into the collection hopper 8, and finally flow out from the collection hopper outlet 9 at the bottom of the collection hopper 8.
[0026] The inner mesh cylinder 4 extends rearward from the outer mesh cylinder 2. A discharge hopper 11 is located on the lower side of the inner mesh cylinder 4, and the discharge hopper 11 is connected to the collection hopper 8 via a discharge pipe 12. Large, non-compliant fertilizer particles screened out in the inner mesh cylinder 4 enter the discharge hopper 11 and then flow into the collection hopper 8 via the discharge pipe 12. The discharge pipe 12 is fixedly connected to the collection hopper 8, thereby allowing the discharge hopper 11 and discharge pipe 12 to be fixedly mounted on the second support frame 7 via the collection hopper 8. Reinforcing ribs can also be installed between the second support frame 7 and the discharge pipe 12.
[0027] A crusher 10 is installed on the lower side of the outlet 9 of the collecting hopper. By installing the crusher 10, the fertilizer particles in the collecting hopper 8 can be crushed. In application, the fertilizer particles in the collecting hopper 8 will enter the crusher 10 under the action of gravity and the vibration of the vibrating motor 20. The crushed fertilizer particles will become particles with a particle size equivalent to the granulation raw material. In this way, when the fertilizer particles that do not meet the particle size requirements screened out by the present invention are re-transported to the disc granulator for granulation, the impact on the normal granulation process of the disc granulator can be reduced.
[0028] A vibrating motor 20 is installed on the collecting hopper 8. By installing a vibrating motor 20 on the collecting hopper 8, the vibration of the vibrating motor 20 drives the fertilizer particles in the discharge hopper 11 to be transported to the collecting hopper 8 and the fertilizer particles in the collecting hopper 8 to the collecting hopper outlet 9 of the collecting hopper 8.
[0029] The first support frame 1 has third support frames 15 installed on both sides of the outer mesh cylinder 2. A first brush roller 16 and a second brush roller 17 are installed vertically between the two third support frames 15. Brush bristles are installed on the first brush roller 16 and the second brush roller 17 respectively. The first brush roller 16 is inserted into the upper side between the outer mesh cylinder 2 and the sleeve 6, and the brush bristles on the first brush roller 16 are in contact with the outer mesh cylinder 2. The second brush roller 17 is inserted into the upper side inside the inner mesh cylinder 4, and the brush bristles on the second brush roller 17 are in contact with the inner mesh cylinder 4. The two ends of the first brush roller 16 and the second brush roller 17 are rotatably connected to the two third support frames 15 on both sides through bearings.
[0030] This invention effectively prevents clogging of the inner mesh cylinder 4 and the outer mesh cylinder 2 by setting a first brush roller 16 and a second brush roller 17. The first brush roller 16 is inserted into the upper part between the outer mesh cylinder 2 and the sleeve 6, with its bristles in contact with the outer mesh cylinder 2. When the outer mesh cylinder 2 rotates around its own axis, the first brush roller 16 does not rotate around its axis, but its bristles contact the outer mesh cylinder 2 and clear the blockage from the mesh openings. Similarly, the second brush roller 17 is inserted into the upper part of the inner mesh cylinder 4, with its bristles in contact with the inner mesh cylinder 4. When the inner mesh cylinder 4 rotates around its own axis, the second brush roller 17 does not rotate around its axis, but its bristles contact the inner mesh cylinder 4 and clear the blockage from the mesh openings.
[0031] A first conveyor 18 is installed below the discharge port of the outer mesh cylinder 2, and a second conveyor 19 is installed below the discharge port of the crusher 10. In this invention, the first conveyor 18 and the second conveyor 19 can be vertically arranged. The first conveyor 18 transports fertilizer granules that meet the particle size requirements flowing out of the outer mesh cylinder 2 to the next processing step, while the second conveyor 19 transports the fertilizer granules crushed by the crusher 10 to a disc granulator for regranulation.
[0032] The screening process of this utility model is as follows: During screening, the granulated fertilizer particles are first conveyed to the inner screen cylinder 4 through the feed hopper 14 and feed pipe 13. The outer screen cylinder 2 is driven to rotate by the reduction motor 3. The outer screen cylinder 2 and the inner screen cylinder 4 rotate synchronously. During the rotation and movement of the fertilizer particles in the inner screen cylinder 4, the fertilizer particles that meet the particle size requirements and the small fertilizer particles that do not meet the particle size requirements leak from the mesh of the inner screen cylinder 4 into the outer screen cylinder 2. During the rotation and movement of the fertilizer particles in the outer screen cylinder 2, the small fertilizer particles that do not meet the particle size requirements leak from the mesh of the outer screen cylinder 2 into the sleeve 6 and enter the collection hopper 8 on the lower side of the sleeve 6. The large fertilizer particles that do not meet the particle size requirements will eventually fall into the discharge hopper 11 and enter the collection hopper 8 through the discharge pipe 12. The fertilizer particles that meet the particle size requirements will fall onto the first conveyor 18.
Claims
1. A rotary drum screen for fertilizer production, characterized in that, The device includes a first support frame (1), on which an outer mesh cylinder (2) is rotatably mounted. The outer mesh cylinder (2) is driven to rotate by a reduction motor (3). An inner mesh cylinder (4) is installed inside the outer mesh cylinder (2). The outer mesh cylinder (2) and the inner mesh cylinder (4) are connected by a connecting rib (5). A sleeve (6) is fitted on the outside of the outer mesh cylinder (2). The sleeve (6) is fixedly mounted on a second support frame (7). A collecting hopper (8) is installed at the bottom of the sleeve (6). A collecting hopper outlet (9) is opened at the bottom of the collecting hopper (8). A crusher (10) is set on the lower side of the collecting hopper outlet (9). The rear end of the inner mesh cylinder (4) extends backward out of the outer mesh cylinder (2). A discharge hopper (11) is set on the lower side of the inner mesh cylinder (4). The discharge hopper (11) is connected to the collecting hopper (8) through a discharge pipe (12).
2. The rotary drum screen for fertilizer production according to claim 1, characterized in that, The first support frame (1) has a feed pipe (13) fixedly installed at the feed end, and the lower end of the feed pipe (13) is inserted into the inner mesh cylinder (4).
3. The rotary drum screen for fertilizer production according to claim 2, characterized in that, The top of the feed pipe (13) is equipped with a feed hopper (14).
4. The rotary drum screen for fertilizer production according to claim 1, characterized in that, The first support frame (1) has a third support frame (15) installed on both sides of the outer mesh cylinder (2). A first brush roller (16) and a second brush roller (17) are installed vertically between the two third support frames (15). Brush bristles are installed on the first brush roller (16) and the second brush roller (17). The first brush roller (16) is inserted into the upper side between the outer mesh cylinder (2) and the sleeve (6) and the brush bristles on the first brush roller (16) abut against the outer mesh cylinder (2). The second brush roller (17) is inserted into the upper side inside the inner mesh cylinder (4) and the brush bristles on the second brush roller (17) abut against the inner mesh cylinder (4).
5. The rotary drum screen for fertilizer production according to claim 4, characterized in that, The two ends of the first brush roller (16) are rotatably connected to the third support frame (15) on both sides via bearings, and the two ends of the second brush roller (17) are rotatably connected to the third support frame (15) on both sides via bearings.
6. The rotary drum screen for fertilizer production according to claim 1, characterized in that, The first conveyor (18) is installed on the lower side of the discharge port of the outer mesh cylinder (2).
7. The rotary drum screen for fertilizer production according to claim 1, characterized in that, A second conveyor (19) is installed on the lower side of the discharge port of the crusher (10).
8. The rotary drum screen for fertilizer production according to claim 1, characterized in that, Both the outer mesh cylinder (2) and the inner mesh cylinder (4) are inclined downwards along the direction from the feed end to the discharge end.
9. The rotary drum screen for fertilizer production according to any one of claims 1-8, characterized in that, A vibrating motor (20) is installed on the hopper (8).