Dust recovery drum screen and compound fertilizer production line
By designing a cover structure on the drum screen, the problems of dust pollution and inconvenient maintenance are solved, and the convenience of dust recycling and maintenance is realized, reducing cleaning costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 韶关芭田生态工程有限公司
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-07
Smart Images
Figure CN224463142U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of material screening devices for compound fertilizer production lines, specifically to a dust recovery drum screen and a compound fertilizer production line. Background Technology
[0002] In a compound fertilizer production line, various raw materials are mixed and shaped into granular products through a granulation device. Particle size is an indicator for evaluating whether the product granules are qualified. Only product granules with particle size within a certain range are qualified products.
[0003] Therefore, the product granules produced by the granulation unit must be screened to select those with the correct particle size. In actual production, the compound fertilizer production line will have a drying device and a cooling device downstream of the granulation unit. After drying and cooling, the product granules produced by the granulation unit will be screened by a drum screen to select those with the correct particle size. For product granules that are too large, they will be returned to the crushing device, where they will be crushed into powder and then granulated by the granulation unit.
[0004] During the screening process, because the product particles are relatively dry, a significant amount of dust is generated. This dust escapes through the opening at the top of the drum screen housing, spreading and settling within the workshop. This not only contaminates the equipment and affects worker health but also accumulates on packaged products, causing soiled packaging and hindering normal product shipment. One feasible approach to reduce dust hazards is to fix a cover plate at the top opening of the crushing device. However, this cover plate would make maintenance of the drum screen inconvenient. Utility Model Content
[0005] This application provides a dust recovery drum screen, which achieves dust control while ensuring easy maintenance of the drum screen; this application also provides a compound fertilizer production line with the above-mentioned dust recovery drum screen.
[0006] In a first aspect, this application provides a dust recovery drum screen, comprising:
[0007] The box has an inner cavity and an opening at the top;
[0008] A drum screen is rotatably installed inside the inner cavity and located below the upper opening;
[0009] A sealing structure is provided to seal the upper opening to prevent dust inside the box from escaping through the upper opening. The sealing structure includes a support structure and a covering cloth, wherein the rigidity of the support structure is greater than that of the covering cloth.
[0010] The supporting structure is provided at the upper opening to cover a portion of the upper opening. There is a gap between the supporting structure and at least a portion of the edge of the upper opening to form a working opening between the supporting structure and the housing for workers to work inside the cavity. The covering cloth is connected to the supporting structure and covers the working opening. The edge of the covering cloth hangs down to the outside of the housing and is below the edge of the upper opening.
[0011] In one embodiment, the support structure is a support plate, which is a single piece of plate, or the support plate is composed of multiple plates spliced together.
[0012] In one embodiment, the support plate is a polyvinyl chloride board, and the covering cloth is a waterproof cloth.
[0013] In one embodiment, the support structure includes at least two spaced-apart support rods connected to adjacent support rods by the covering cloth, and the support rods are detachably disposed at the upper opening.
[0014] In one embodiment, the dust recovery drum screen further includes a cross brace, which is disposed at the upper opening and fixed to the housing. The support structure is supported on the cross brace, and the cross brace supports the covering cloth.
[0015] In one embodiment, the upper opening is a rectangular opening, and the working ports are provided on at least two sides of the rectangular opening.
[0016] Secondly, this application provides a compound fertilizer production line, comprising:
[0017] A rotary drum screen, as described in any of the above embodiments, is a dust recovery rotary drum screen, wherein the rotary drum screen has a discharge port for discharging materials.
[0018] A crushing device is located downstream of the drum screen, and the crushing device has a feed inlet for material to enter its cavity.
[0019] In one embodiment, a dust cover is provided at the feed inlet, and the dust cover is connected to a dust suction pipe.
[0020] In one embodiment, the feed inlet faces upward, the lower end of the dust cover has a mating interface that connects with the feed inlet, and the side of the dust cover has a passage for materials to pass through into the feed inlet.
[0021] In one embodiment, the vacuum pipe is provided with an inspection port, and the inspection port is provided with an openable and closable inspection door.
[0022] According to the compound fertilizer production line in the above embodiment, when the drum screen screens materials, dust is generated inside the inner cavity of the box. However, because the sealing structure covers the upper opening of the drum screen box, the dust generated inside the inner cavity cannot escape through the upper opening. The dust settles inside the box, achieving dust control and dust recovery. Furthermore, part of the sealing structure is formed by a covering cloth, and the covering cloth covers the working opening between the support structure and the box. When it is necessary to inspect, clean, and repair the inside of the box, only the covering cloth needs to be lifted, without removing the entire sealing structure. This achieves dust control and recovery without affecting the convenience of drum screen maintenance. Moreover, the opening of such a sealing structure requires less operating space. For large drum screens where the upper opening is close to the roof of the factory building, the working opening can be opened very conveniently. Attached Figure Description
[0023] Figure 1 This is a partial structural schematic diagram of a compound fertilizer production line in one embodiment of this application;
[0024] Figure 2 This is a schematic diagram of the sealing structure of a compound fertilizer production line in one embodiment of the present application, showing the opening and sealing of the box at the upper end of the box.
[0025] Figure 3 This is a schematic diagram of the sealing structure of the compound fertilizer production line in another embodiment of this application.
[0026] List of feature names corresponding to the labels in the figure:
[0027] 1. Rotary drum screen; 11. Box body; 12. Top opening; 13. Rotary drum screen mesh; 14. Power unit; 15. Covering structure; 151. Support structure; 152. Covering cloth; 1521. Edge; 153. Support plate; 154. Support rod; 16. Working port; 17. Horizontal brace; 18. Discharge port;
[0028] 2. Crushing device; 21. Feed inlet;
[0029] 3. Dust cover; 31. Connecting interface; 32. Notch;
[0030] 4. Vacuum suction pipe; 41. Inspection door.
[0031] Explanation of reference numerals in parentheses in the accompanying drawings: The feature referred to by the reference numerals in parentheses in the accompanying drawings is the feature represented by both the number inside the parentheses and the number outside the parentheses. Detailed Implementation
[0032] The present application will be further described in detail below in conjunction with the accompanying drawings through specific embodiments. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and general technical knowledge in the art.
[0033] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operation steps involved in each embodiment can also be reordered or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a certain embodiment, and do not mean that they are essential components and / or sequences.
[0034] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).
[0035] The present application provides a compound fertilizer production line. The compound fertilizer production line includes a granulation device that forms compound fertilizer raw materials into product particles. The compound fertilizer production line further includes a drying device and a cooling device disposed downstream of the granulation device. The drying device dries the product particles, and the cooling device cools the product particles. The compound fertilizer production line can be an urea-based production line or a nitro-based production line, which is not limited herein.
[0036] Since the product particles formed by the granulation device have different sizes, and only the product particles with a particle size within a certain range are qualified products. Therefore, please refer to Figure 1 , the compound fertilizer production line further includes a drum screen 1 and a crushing device 2. It should be noted here that since the key point of the technical solution of the present application is the treatment and recovery of dust generated at the drum screen 1 and the crushing device 2, therefore, in Figure 1 only the drum screen 1, the crushing device 2, and their related dust treatment structures are schematically shown. For other equipment, since it has no direct relation to the key point of the technical solution of the present application, it is not shown. In actual layout, the drum screen 1 and the crushing device 2 are disposed downstream of the drying device and the cooling device.
[0037] For the structure of the drum screen 1, please refer to Figure 1 The drum screen 1 includes a box body 11, which has an inner cavity, and the upper end of the box body 11 is an open structure, forming an upper opening 12.
[0038] The drum screen 1 also includes a drum screen 13, which is rotatably mounted in the inner cavity of the housing 11 and located below the upper opening 12. The drum screen 1 also includes a power unit 14, which is connected to the drum screen 13 for driving the drum screen 13 to rotate and realize the screening of product particles.
[0039] The upper opening 12 allows the interior of the box 11 to be visible, facilitating inspection, maintenance, and cleaning. However, since the product particles screened by the drum screen 1 are in a dry state, dust will be generated inside the drum screen 13 when screening the product particles. The dust will overflow into the workshop through the upper opening 12, polluting the equipment and affecting the health of the workers. Moreover, for the bagged products stacked in the workshop, the dust will settle on the packaging bags, soiling them and affecting the shipment of the products.
[0040] In this regard, such as Figure 1 and Figure 2 As shown, the drum screen 1 also includes a cover structure 15 that covers the upper opening 12. Because the drum screen 1 in the compound fertilizer production line is large, the upper opening 12 is also large. Therefore, the cover structure 15 consists of two parts: a support structure 151 and a covering cloth 152. The rigidity of the support structure 151 is greater than that of the covering cloth 152. The support structure 151 supports the upper opening 12. Based on the relatively high rigidity of the support structure 151, it is easy to stably support and install it at the upper opening 12. Stability here refers to two aspects: firstly, the support structure 151 has a greater load-bearing capacity and will not easily collapse due to accumulated debris; secondly, the support structure 151 can be stably installed at the upper opening 12 and will not be easily moved. Of course, the support structure 151 can be fixed or not fixed relative to the housing 11, and even if fixed, it can be detachably fixed. At the same time, based on the relatively high rigidity of the support structure 151, the size of the support structure 151 can be made relatively large, so that the size of the support structure 151 can cover most of the upper opening 12.
[0041] There is a gap between the support structure 151 and the edge of the opening 12 at the top of the box 11, which forms an access port 16. Operators can inspect, repair and clean the inside of the box 11 through the access port 16. Specifically, the access port 16 can be used for tools to pass through and for personnel to go down into the box 11.
[0042] The covering cloth 152 is connected to the support structure 151 and covers the working opening 16. Regarding the covering state, as follows: Figure 1 As shown, the edge 1521 of the covering cloth 152 hangs down to the outside of the box 11 and is below the edge of the upper opening 12. In this way, the sealing structure 15 completely seals the upper opening 12, preventing dust inside the box 11 from escaping through the upper opening 12, and sealing the dust inside the box 11. The dust settles inside the box 11, achieving dust prevention, control, and recycling. When inspection, maintenance, and cleaning operations are required inside the box 11, the covering cloth 152 can be lifted to expose the working opening 16 for operators to work on. This ensures convenient maintenance of the drum screen 1 while achieving dust control and recycling. Because the large drum screen 1 is relatively tall and the upper opening 12 is close to the factory roof, this sealing structure 15 requires less height space when lifting the covering cloth 152 to open the working opening 16, making it very convenient to open the working opening 16 even though the upper opening 12 is close to the factory roof.
[0043] In some embodiments, such as Figure 2 As shown, the support structure 151 is a single support plate 153. The covering cloth 152 is connected to the edge of the support plate 153. The connection method can adopt any existing technology that can connect a flexible cloth to a rigid plate, such as riveting the covering cloth 152 to the edge of the support plate 153 with rivets, or fixing a pressure strip to the support plate 153 with a bolt and nut assembly, thereby pressing the covering cloth 152 tightly to the edge of the support plate 153. In some other embodiments, the support plate 153 can also be composed of multiple plates spliced together.
[0044] Regarding the material of the support plate 153, in some embodiments, the support plate 153 is a PVC board, i.e., a polyvinyl chloride board. In other embodiments, the support plate 153 can also be a metal plate, a wooden board, etc. The covering cloth 152 is a waterproof cloth, and the material can be any material that can be made into a waterproof cloth in the prior art, such as polyethylene. In other embodiments, the covering cloth 152 can also be a woven fabric, but it is required to have a high density to prevent dust from escaping.
[0045] In some other embodiments, such as Figure 3As shown, the support structure 151 can also be multiple support rods 154 arranged in parallel at intervals. The area of the covering cloth 152 is larger than the upper opening 12. The part corresponding to the middle area of the covering cloth 152 and the upper opening 12 is connected to each support rod 154. In this way, two adjacent support rods 154 are connected by the covering cloth 152. The support rods 154 are supported at the upper opening 12 of the box body 11. The support rods 154 are detachably set at the upper opening 12. When overhauling the drum screen 1, the cover structure 15 can be completely removed. After the cover structure 15 is removed from the box body 11, the support rods 154 can be gathered together, reducing the space occupied by the cover structure 15 and making it easier to store the cover structure 15.
[0046] To ensure stable support of the support structure 151 at the opening 12 at the upper end of the housing 11, the drum screen 1 also includes a horizontal brace 17 at the opening 12 at the upper end of the housing 11. Both ends of the horizontal brace 17 are fixedly connected to the housing 11, and the cover structure 15 is supported on the horizontal brace 17. If the support structure 151 is a support plate 153, the support plate 153 is placed on the horizontal brace 17, and the covering cloth 152 is also supported by the horizontal brace 17, preventing the covering cloth 152 from collapsing at a localized location on the cover structure 15 and causing dust to escape. If the support structure 151 consists of multiple spaced support rods 154, the support rods 154 are supported perpendicularly to the horizontal brace 17 on the upper side of the horizontal brace 17, and the horizontal brace 17 also supports the covering cloth 152. In some other embodiments, the cross brace 17 may not be provided, and the two ends of the support plate 153 may rest directly on the edge of the opening 12 at the upper end of the box 11, or the two ends of the support rod 154 may rest directly on the edge of the opening 12 at the upper end of the box 11.
[0047] Regarding the location of the working openings 16, in some embodiments, the upper opening 12 of the housing 11 is a rectangular opening, and the working openings 16 are provided around the perimeter of the rectangular opening. That is, the support structure 151 only covers the central area of the upper opening 12, and there is a gap between the support structure 151 and the rim of the upper opening 12. In other embodiments, the working openings 16 may be provided only on one, two, or three sides of the rectangular opening. The shape of the upper opening 12 of the housing 11 can also be any other feasible shape, such as ellipse, pentagon, etc.
[0048] Please refer to Figure 1 The drum screen 1 also has a discharge port 18 for discharging product particles larger than the qualified standard. The crushing device 2 has a feed port 21 for material to enter its crushing chamber. Large-sized product particles discharged from the drum screen 1 through the discharge port 18 enter the crushing device 2 through the feed port 21, where they are crushed and finally granulated by the granulation device. A belt conveyor can be installed between the feed port 21 of the crushing device 2 and the discharge port 18 of the drum screen 1 for transferring large-sized product particles.
[0049] Because large-sized product particles fall into the crushing chamber of the crushing device 2 and dust is generated during the operation of the crushing device 2, it will return upwards through the feed inlet 21 of the crushing device 2. This dust entering the workshop will also contaminate the workshop equipment and product packaging bags, affecting the health of the workers. Therefore, in some embodiments, a dust cover 3 is provided for the feed inlet 21 of the crushing device 2. The dust cover 3 is connected to a dust suction pipe 4, which can absorb the dust returning through the feed inlet 21.
[0050] In some embodiments, the feed inlet 21 of the crushing device 2 faces upward, and the dust cover 3 has a frustum-shaped outline with an open lower end, forming a mating interface 31 for docking with the feed inlet 21. A notch 32 is present on one side wall of the dust cover 3, forming a passage for material to enter the feed inlet 21. Since the notch 32 forms a passage, the passage and the mating interface 31 are connected. To facilitate inspection and cleaning of the suction pipe 4, an inspection port is provided on the suction pipe 4, with an inspection door 41 for the inspection port. During normal operation, the inspection door 41 closes the inspection port to ensure the airtightness of the suction pipe 4. When it is necessary to inspect and clean the inside of the suction pipe 4, the inspection door 41 can be opened. The structure of the inspection door 41 can be any existing door structure that can be installed on the outer wall of the pipe, such as a sliding door that can be opened and closed axially or circumferentially along the suction pipe 4. The dust cover 3 can be suspended above the feed inlet 21. Dust suction pipe 4 connects to the sedimentation tank to collect powder materials, which can be used for return material consumption when the production line is started.
[0051] Regarding the benefits of the dust control design for the drum screen 1 and crushing device 2 in the compound fertilizer production line of this application, previously, dust settled on the floor, surface of finished product packaging bags, and equipment surfaces throughout the workshop. If not cleaned for half a day, the dust thickness could reach about 2 cm, requiring two additional cleaning personnel. However, in the compound fertilizer production line of this application, no special dust cleaning is needed. Dust from the drum screen 1 does not escape; it settles internally and is collected by a scraper as recycled material. Dust from the crusher 2 is drawn to the sedimentation tank via the dust extraction pipe 4. A traditional compound fertilizer production line, assuming an average of 20 shifts per month, would require an additional 2 people * 20 days = 40 workers. At 250 yuan / person / day, this would average 10,000 yuan per month, or 120,000 yuan per year. After the modification, only the cleaning personnel need to clean, saving additional labor costs. Regarding dirty packaging, traditionally, approximately 10 tons of finished products were deemed unqualified each month due to dirty packaging, totaling 120 tons per year, with a remelting cost of approximately 300 yuan / ton, totaling 36,000 yuan. Therefore, the technical solution proposed in this application can save a total of RMB 156,000 per year.
[0052] This application also provides a dust recovery drum screen, which has the same structure as the drum screen 1 of the compound fertilizer production line in the above embodiments, and will not be described again here.
[0053] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.
Claims
1. A dust recovery drum screen, characterized in that, include: The box has an inner cavity and an opening at the top; A drum screen is rotatably installed inside the inner cavity and located below the upper opening; A sealing structure is provided to seal the upper opening to prevent dust inside the box from escaping through the upper opening. The sealing structure includes a support structure and a covering cloth, wherein the rigidity of the support structure is greater than that of the covering cloth. The supporting structure is provided at the upper opening to cover a portion of the upper opening. There is a gap between the supporting structure and at least a portion of the edge of the upper opening to form a working opening between the supporting structure and the housing for workers to work inside the cavity. The covering cloth is connected to the supporting structure and covers the working opening. The edge of the covering cloth hangs down to the outside of the housing and is below the edge of the upper opening.
2. The dust recovery drum screen as described in claim 1, characterized in that, The supporting structure is a support plate, which is a single piece of plate, or the support plate is composed of multiple plates spliced together.
3. The dust recovery drum screen as described in claim 2, characterized in that, The support plate is a polyvinyl chloride board, and the covering cloth is a waterproof cloth.
4. The dust recovery drum screen as described in claim 1, characterized in that, The support structure includes at least two spaced-apart support rods, which are connected to each other by the covering cloth. The support rods are detachably installed at the upper opening.
5. The dust recovery drum screen as described in any one of claims 1-4, characterized in that, The dust recovery drum screen also includes a cross brace, which is located at the upper opening and fixed to the housing. The support structure is supported on the cross brace, and the cross brace supports the covering cloth.
6. The dust recovery drum screen as described in any one of claims 1-4, characterized in that, The upper opening is a rectangular opening, and the working ports are provided on at least two sides of the rectangular opening.
7. A compound fertilizer production line, characterized in that, include: A rotary drum screen, the rotary drum screen for dust recovery as described in any one of claims 1-6, the rotary drum screen having a discharge port for discharging materials; A crushing device is located downstream of the drum screen, and the crushing device has a feed inlet for material to enter its cavity.
8. The compound fertilizer production line as described in claim 7, characterized in that, The feed inlet is equipped with a dust cover, which is connected to a dust suction pipe.
9. The compound fertilizer production line as described in claim 8, characterized in that, The feed inlet faces upward, the lower end of the dust cover has a mating interface that connects with the feed inlet, and the side of the dust cover has a passage for materials to pass through into the feed inlet.
10. The compound fertilizer production line as described in claim 8 or 9, characterized in that, The vacuum pipe is provided with an inspection port, and the inspection port is provided with an openable and closable inspection door.