Granulator for organic fertilizer production

Abstract

The utility model relates to the field of organic fertilizer production equipment, and provides a pelletizer for organic fertilizer production, which comprises a machine body and a pair of rollers arranged in the machine body, each roller comprises a roller body and a compression roller surface, and each compression roller surface is formed by splicing a plurality of arc-shaped panels; a plurality of dovetail grooves are formed in the roller body, and dovetail tenons matched with the dovetail grooves are convexly arranged on the inner concave surfaces of the arc-shaped panels; and an N-shaped seam is formed between the arc-shaped panel and the adjacent arc-shaped panel. According to the pelletizer for organic fertilizer production, only the compression roller surface can be replaced under the condition that the compression roller surface is abraded, the replacement process can be ensured to be simple and easy to operate, joints of the compression roller surface are not easy to be adhered by materials after replacement, the compression roller surface and the roller body are always kept to be tightly and stably combined, the pelletizing quality is not influenced, the frequency of replacing the compression roller surface is reduced, and the production efficiency is improved. And the equipment cost in the granulation process is saved.

Description

Technical Field

[0001] This utility model relates to the technical field of organic fertilizer production equipment, specifically to a granulator for organic fertilizer production. Background Technology

[0002] In the process of modern agricultural development, organic fertilizer has become an important input in agricultural production due to its many advantages, such as improving soil structure, enhancing soil fertility, and reducing environmental pollution. With the development of mechanized fertilization, granular fertilizer has become an inevitable trend to replace powder fertilizer. Therefore, organic fertilizer granulators have become key equipment in organic fertilizer production.

[0003] A double-roll granulator uses a pair of opposing rotating rollers to compress materials into granules through the grooved structure on the roller surface and the pressure. Due to its simple structure, high granulation efficiency, and low energy consumption, it is used in various fields such as plastics, rubber, metal powder, fertilizer, and food.

[0004] Roller granulators are the most common granulation method in organic fertilizer production. However, in actual production, due to the complex composition of organic fertilizer raw materials, which often contain hard particles such as sand, gravel, and metal scraps, these hard particles constantly rub against the roller surface during extrusion granulation, causing severe wear. Furthermore, because organic fertilizer raw materials are highly viscous, they easily adhere to the roller surface. When the rollers rotate, the adhered material slides relative to the roller surface, further exacerbating wear. As roller surface wear intensifies, it not only leads to decreased granulation dimensional accuracy and poorer granule quality, resulting in a lower product qualification rate, but also increases energy consumption and noise during equipment operation. In addition, frequent replacement of worn rollers significantly increases equipment investment costs, impacting the company's economic benefits.

[0005] To address the aforementioned problems, existing technologies employ a separate design for the roller body and the pressure roller surface. This allows for cost reduction by replacing only the pressure roller surface when it wears, as illustrated by patents CN202803198U, CN205219820U, and CN204566763U. These patents disclose solutions that involve replacing only the pressure roller surface. However, these existing solutions either replace the entire pressure roller surface or use modular pressure roller surfaces. For integral pressure roller surfaces, the large size makes replacement difficult, and the interference fit typically makes disassembly challenging. For modular pressure roller surfaces, issues arise regarding the tightness and stability of the fit between the replaced pressure roller surface and the roller body. Furthermore, the seams between different modules face problems such as material adhering to the seams and accumulating under pressure, potentially causing modules to detach from the roller body or separating from each other.

[0006] Therefore, how to replace the pressure roller surface simply, effectively, and at low cost, while maintaining the tightness and stability of the fit between the pressure roller surface and the roller body, is one of the technical challenges that need to be overcome in the current organic fertilizer granulation process. Utility Model Content

[0007] The purpose of this utility model is to provide a granulator for organic fertilizer production, which can replace only the pressure roller surface when the pressure roller surface is worn, and can ensure that the replacement process is simple and easy to operate. After replacement, the seam of the pressure roller surface is not easily adhered by the material, and the pressure roller surface and the roller body always maintain a tight and stable bond, which does not affect the granulation quality. The frequency of pressure roller surface replacement is reduced, saving equipment costs in the granulation process.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0009] A granulator for organic fertilizer production includes a machine body and a pair of rollers disposed within the machine body. Each roller includes a roller body and a pressure roller surface, which is formed by splicing multiple arc-shaped panels. The roller body has multiple dovetail grooves, and the concave surface of each arc-shaped panel has a dovetail tenon that mates with the dovetail groove. A first wedge-shaped groove and a first wedge-shaped block are formed on the concave surface of one side edge of the arc-shaped panel, and a second wedge-shaped groove and a second wedge-shaped block are formed on the convex surface of the other side edge of the arc-shaped panel. The first wedge-shaped groove of one arc-shaped panel mates with the second wedge-shaped block of an adjacent arc-shaped panel, and the second wedge-shaped groove of the arc-shaped panel mates with the first wedge-shaped block of the adjacent arc-shaped panel, thereby forming an N-shaped joint between the arc-shaped panel and the adjacent arc-shaped panel.

[0010] Preferably, the outer convex surface of the curved panel near the first wedge groove has a first chamfer, and the outer convex surface of the curved panel near the second wedge groove has a second chamfer, so that a V-shaped chamfer is formed at the joint of the outer convex surface after the two adjacent curved panels are spliced ​​together; a wedge-shaped sealing strip is laid at the bottom of the V-shaped chamfer, and the top surface of the wedge-shaped sealing strip extends into the joint of the adjacent curved panels.

[0011] Preferably, four curved panels are provided, and the four curved panels are spliced ​​together to form the pressure roller surface.

[0012] Preferably, the roller body is also equipped with a pair of cover plates; one cover plate is detachably fixed to one end of the roller body, and the other cover plate is detachably fixed to the other end of the roller body; one end of the pressure roller surface abuts against one cover plate, and the other end of the pressure roller surface abuts against the other cover plate, and the pair of cover plates axially limit the pressure roller surface.

[0013] Preferably, a convex ring is formed on the outer edge of the cover plate near the roller surface; concave rings that are adapted to the convex ring are formed at both ends of the roller surface; the convex ring, the concave ring and the roller body located inside the concave ring are all provided with threaded holes arranged coaxially, and a bolt is inserted into the threaded holes in sequence to fasten the convex ring, the concave ring and the roller body together.

[0014] Preferably, the system further includes a pair of symmetrically arranged scraper assemblies, one scraper assembly being disposed within the machine body below one roller and the other scraper assembly being disposed within the machine body below another roller; the scraper assembly includes a blade holder and a scraper body fixed to the blade holder; the length direction of both the blade holder and the scraper body is distributed along the axial direction of the roller; one blade holder is fixed to one side of the inner wall of the machine body, and the other blade holder is fixed to the other side of the inner wall of the machine body; the scraper body and the blade holder are inclined so that the blade of the scraper body contacts the surface of the pressure roller and is distributed perpendicularly to the surface of the pressure roller.

[0015] Preferably, the system further includes a pair of symmetrically arranged purging assemblies, one purging assembly being disposed within the machine body above one roller and the other purging assembly being disposed within the machine body above another roller; the purging assembly includes an air supply pipe and multiple nozzles, the length direction of the air supply pipe being distributed along the axial direction of the roller, and the multiple nozzles being evenly distributed along the length direction of the air supply pipe; the specified angle between the central axis of the nozzle and the surface of the pressure roller is less than 60°, the specified angle being the angle between the central axis of the nozzle and the surface of the pressure roller that is closer to the top of the machine body and closer to the nozzle; the pair of purging assemblies are equipped with an air supply device.

[0016] Preferably, the machine body is also equipped with a pair of baffles, one baffle being positioned between the nozzle of a purging assembly and the feed inlet of the machine body, and being positioned close to the nozzle of the purging assembly.

[0017] Preferably, the baffle has a fixing hole through which the air supply pipe passes.

[0018] Preferably, it also includes a dust collection component, which is located near the bottom of the machine body, and includes a negative pressure device and a filter bag.

[0019] The present invention has the following advantages over the prior art:

[0020] (1) The present invention forms the pressure roller surface by splicing arc-shaped panels, which makes the replacement operation easy; and the arc-shaped panels and the roller body are detachably connected by dovetail grooves and dovetail tenons, the entire connection structure is stable, and the arc-shaped panels and the pressure roller surface are closely fitted; at the same time, the adjacent arc-shaped panels of the present invention form an N-type joint by connecting the first wedge block, the first wedge groove, the second wedge block and the second wedge groove, so that even if the material enters the joint from the surface, it can only enter the surface joint and will not accumulate continuously in the entire joint, thus preventing the pressure roller surface and the roller body from separating, and preventing the adjacent arc-shaped panels from separating.

[0021] (2) The present invention sets chamfers on both sides of the arc panel and splices them to form a V-shaped groove. A wedge-shaped sealing strip is laid at the bottom of the V-shaped groove to further prevent material from entering the joint. The wedge-shaped sealing strip is located in the V-shaped groove. When the double rollers are extruded, the wedge-shaped sealing strip does not directly contact the pressure roller surface of the other roller, so it will not affect the normal granulation process and will not change the design gap between the pair of rollers.

[0022] (3) The present invention also includes a scraper assembly, which can clean the surface of the non-grooved part of the pressure roller to avoid excessive material adhering to the surface and thus aggravating surface wear.

[0023] (4) The present invention also includes a purging component, which uses airflow pressure to further clean the material adhering to the grooves or non-grooves on the surface of the pressure roller, thereby improving the granulation quality and granulation efficiency. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the internal structure of the granulator for organic fertilizer production according to this utility model.

[0025] Figure 2 This is a structural diagram of the rollers of the granulator used in the production of organic fertilizer according to this utility model.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 This is another structural view of the roller of the granulator for organic fertilizer production according to this utility model.

[0028] Figure 5 This is a structural diagram of the arc-shaped panel of the granulator for organic fertilizer production according to this utility model.

[0029] Figure 6 This is a structural diagram of the roller body of the granulator for organic fertilizer production according to this utility model.

[0030] Figure label:

[0031] 10-Machine body, 11-Feed inlet, 12-Screen plate, 13-First discharge outlet, 14-Second discharge outlet, 20-Roller, 21-Roller body, 211-Dovetail groove, 212-Dovetail tenon, 22-Pressure roller surface, 221-Arc panel, 222-First wedge groove, 223-First wedge block, 224-Second wedge groove, 225-Second wedge block, 226-First chamfer, 227-Second chamfer, 228-V-shaped chamfer, 229-Groove, 23-Wedge sealing strip, 24-Cover plate, 241-Protruding ring, 242-Concave ring, 243-Bolt, 30-Scraper assembly, 31-Scraper holder, 32-Scraper body, 40-Blowing assembly, 41-Air supply pipe, 42-Nozzle, 43-Baffle, 50-Dust suction assembly, 51-Filter bag. Detailed Implementation

[0032] The specific implementation method is described below with reference to the accompanying drawings.

[0033] Reference Figures 1-6 This embodiment provides a granulator for organic fertilizer production, including a machine body 10 and a pair of rollers 20 disposed within the machine body 10. Each roller 20 includes a roller body 21 and a pressure roller surface 22. The pressure roller surface 22 is formed by splicing together multiple arc-shaped panels 221. Multiple dovetail grooves 211 are formed on the roller body 21. A dovetail tenon 212 that mates with the dovetail grooves 211 is provided on the concave surface of the arc-shaped panel 221. A first wedge-shaped groove 222 is formed on the concave surface of one side edge of the arc-shaped panel 221. A first wedge-shaped block 223 is formed, and a second wedge-shaped groove 224 is formed on the outer convex surface of the other side edge of the arc panel 221, forming a second wedge-shaped block 225; the first wedge-shaped groove 222 of the arc panel 221 cooperates with the second wedge-shaped block 225 of the adjacent arc panel 221, and the second wedge-shaped groove 224 of the arc panel 221 cooperates with the first wedge-shaped block 223 of the adjacent arc panel 221, so that an N-shaped joint is formed between the arc panel 221 and the adjacent arc panel 221.

[0034] This invention firstly employs modular arc-shaped panels 221 spliced ​​together to form the pressure roller surface 22, making the replacement of the pressure roller surface 22 more convenient than replacing a complete panel. Simultaneously, this invention also designs a dovetail groove 211 and a dovetail tenon 212 connection method to achieve a tight and stable connection between the pressure roller surface 22 and the roller body 21. More importantly, this application uses the first wedge groove 222 on the edge of the arc-shaped panel 221 and the second wedge block 225 on the edge of the adjacent arc-shaped panel 221 to fit together, while the first wedge block 223 and the second wedge groove 224 on the adjacent arc-shaped panel 221 fit together, so that the splicing seam of the two arc-shaped panels 221 forms an N-shaped splicing seam. This ensures that even if material gets stuck in the gap during operation, it will only remain on the surface of the pressure roller surface 22 and is unlikely to penetrate further. Therefore, it avoids the problem of the roller body 21 and the pressure roller surface 22 not fitting tightly due to continuous accumulation of stuck material, and the gap between adjacent arc-shaped panels 221 increasing and causing them to detach.

[0035] The above design can effectively achieve a tight fit between the curved panel 221 and the pressure roller surface 22, as well as a stable connection between the curved panel 221 and adjacent curved panels 221. This effectively improves the stable service life of the pressure roller surface 22, reduces the frequency of replacement, and does not affect the granulation quality.

[0036] Preferably, the outer convex surface of the arc-shaped panel 221 near the first wedge groove 222 has a first chamfer 226, and the outer convex surface of the arc-shaped panel 221 near the second wedge groove 224 has a second chamfer 227, so that a V-shaped groove 228 is formed at the joint of the outer convex surfaces after two adjacent arc-shaped panels 221 are spliced ​​together; a wedge-shaped sealing strip 23 is laid at the bottom of the V-shaped groove 228, and the top surface of the wedge-shaped sealing strip 23 extends into the joint of the adjacent arc-shaped panels 221. Through the design of the wedge-shaped sealing strip 23, the material is directly prevented from entering the joint. In this embodiment, the design of the V-shaped groove 228 ensures that the wedge-shaped sealing strip 23 is located at the bottom of the V-shaped groove 228. During double-roller extrusion, the wedge-shaped sealing strip 23 does not directly contact the pressure roller surface 22 of the other roller 20, thus not affecting the normal granulation process and not changing the design gap between the pair of rollers 20.

[0037] Furthermore, this embodiment provides four curved panels 221, which are spliced ​​together to form the pressure roller surface 22. The design of four curved panels 221 takes into account both ease of installation and operability. It avoids operational difficulties due to the large size of a single curved panel 221, and also avoids excessively increasing the operation time due to the installation of multiple curved panels 221.

[0038] In this embodiment, the roller body 21 is also equipped with a pair of cover plates 24; one cover plate 24 is detachably fixed to one end of the roller body 21, and the other cover plate 24 is detachably fixed to the other end of the roller body 21; one end of the pressure roller surface 22 abuts against one cover plate 24, and the other end of the pressure roller surface 22 abuts against the other cover plate 24, and the pair of cover plates 24 axially limit the pressure roller surface 22. Through the design of the cover plates 24, the pressure roller surface 22 is axially engaged between the pair of cover plates 24, and axial displacement of the pressure roller surface 22 will not be caused.

[0039] Preferably, a convex ring 241 extends from the side of the cover plate 24 near the pressure roller surface 22; concave rings 242, adapted to the convex ring 241, are formed at both ends of the pressure roller surface 22; the convex ring 241, the concave ring 242, and the roller body 21 located inside the concave ring 242 are all provided with coaxially arranged threaded holes, and a bolt 243 extends into the threaded holes to fasten the convex ring 241, the concave ring 242, and the roller body 21. Through the design of the convex ring 241 and the concave ring 242, and the fastening method of the bolt 243, the arc-shaped panel 221 can also be better fastened and fitted to the roller body 21.

[0040] The granulator in this embodiment also includes a pair of symmetrically arranged scraper assemblies 30. One scraper assembly 30 is disposed inside the machine body 10 below one roller 20, and the other scraper assembly 30 is disposed inside the machine body 10 below another roller 20. The scraper assembly 30 includes a blade holder 31 and a scraper body 32 fixed to the blade holder 31. Both the blade holder 31 and the scraper body 32 are distributed along the axial direction of the roller 20. One blade holder 31 is fixed to one side of the inner wall of the machine body 10, and the other blade holder 31 is fixed to the other side of the inner wall of the machine body 10. The scraper body 32 is inclined to the blade holder 31 so that the blade of the scraper body 32 contacts the surface of the pressure roller 22 and is distributed perpendicularly to the surface of the pressure roller 22.

[0041] During the extrusion granulation process, due to the excessive extrusion pressure and the sticky nature of organic fertilizer materials, it is inevitable that materials will adhere to the surface of the pressure roller 22. The presence of these adhered materials will not only affect subsequent granulation but also further aggravate the wear of the pressure roller 22. In this embodiment, through the design of the scraper assembly 30, the scraper body 32, which is in contact with the surface of the pressure roller 22 during the rotation of the roller 20, will scrape off the materials adhering to the pressure roller 22, thus preventing them from depositing on the surface of the pressure roller 22 and causing subsequent effects.

[0042] Preferably, the scraper body 32 in this embodiment is made of a non-metallic hard polymer material, specifically polytetrafluoroethylene (PTFE). It can not only scrape off the adhered material, but also will not cause wear on the surface of the pressure roller 22. At the same time, its non-stick properties can also prevent the material from accumulating on the surface of the scraper body 32.

[0043] The granulator in this embodiment also includes a pair of symmetrically arranged blowing assemblies 40. One blowing assembly 40 is disposed inside the machine body 10 above one roller 20, and the other blowing assembly 40 is disposed inside the machine body 10 above another roller 20. The blowing assembly 40 includes an air supply pipe 41 and multiple nozzles 42. The air supply pipe 41 is distributed along the axial direction of the roller 20, and the multiple nozzles 42 are evenly distributed along the length direction of the air supply pipe 41. The specified angle between the central axis of the nozzle 42 and the surface of the pressure roller 22 is less than 60°. The specified angle is the angle between the central axis of the nozzle 42 and the surface of the pressure roller 22 that is closer to the top of the machine body 10 and closer to the nozzle 42. The pair of blowing assemblies 40 are equipped with air supply devices, which can be uniformly configured or separately configured.

[0044] The design of the purging assembly 40 is to further clean the material adhering to the surface of the pressure roller 22, focusing on cleaning the material adhering to the grooves 229 on the surface of the pressure roller 22. The material adhering is removed by blowing away the high-pressure gas at close range. It should be noted that in this embodiment, the central axis of the nozzle 42 is designed with a specified angle of less than 60° with the surface of the pressure roller 22 in order to make the gas blow downward as much as possible and minimize interference with feeding and granulation.

[0045] In a further preferred embodiment, the machine body 10 is also equipped with a pair of baffles 43. One baffle 43 is disposed between the nozzle 42 of the purging assembly 40 and the feed inlet 11 of the machine body 10, and is positioned close to the nozzle 42 of the purging assembly 40. The design of the baffle 43 further prevents the high-pressure gas from affecting the feed into the feed inlet 11 and the granulated material at the granulation stage. In this embodiment, the baffle 43 has a fixing hole through which the air supply pipe 41 passes. It serves as both a baffle 43 and a fixing support for the air supply pipe 41.

[0046] The granulator in this embodiment also includes a dust collection component 50, which is located near the bottom of the machine body 10. The dust collection component 50 includes a negative pressure device and a filter bag 51. Although the bottom of the machine body 10 of this application is provided with a first discharge port 13 located above the screen plate 12 and a second discharge port 14 located below the screen plate 12, and the first discharge port 13 and the second discharge port 14 are connected to the outside, the air pressure inside the machine body 10 will inevitably increase and dust will increase due to the setting of the blowing component 40. Through the design of the dust collection component 50, the air pressure balance inside the machine body 10 can be controlled on the one hand, and the dust in the space can be reduced on the other hand.

[0047] In summary, the granulator for organic fertilizer production in this embodiment can facilitate the replacement of the pressure roller surface 22, and can maintain a stable and tight fit between the pressure roller surface 22 and the roller body 21. During use, it can further reduce the wear of the pressure roller surface 22, reduce the replacement frequency of the pressure roller surface 22, reduce the cost of production equipment, and improve production efficiency.

Claims

1. A granulator for organic fertilizer production, comprising a machine body and a pair of rollers disposed within the machine body, characterized in that, The roller includes a roller body and a pressure roller surface. The pressure roller surface is formed by splicing multiple arc-shaped panels. Multiple dovetail grooves are opened on the roller body, and dovetail tenons that cooperate with the dovetail grooves are protruding from the concave surface of the arc-shaped panels. The concave surface of one side edge of the arc-shaped panel is provided with a first wedge-shaped groove and forms a first wedge-shaped block, and the convex surface of the other side edge of the arc-shaped panel is provided with a second wedge-shaped groove and forms a second wedge-shaped block. The first wedge groove of the arc-shaped panel engages with the second wedge block of the adjacent arc-shaped panel, and the second wedge groove of the arc-shaped panel engages with the first wedge block of the adjacent arc-shaped panel, thereby forming an N-type seam between the arc-shaped panel and the adjacent arc-shaped panel.

2. The granulator for organic fertilizer production according to claim 1, characterized in that, The outer convex surface of the arc panel near the first wedge groove has a first chamfer, and the outer convex surface of the arc panel near the second wedge groove has a second chamfer, so that a V-shaped chamfer is formed at the splicing seam of the outer convex surface after two adjacent arc panels are spliced ​​together. The bottom of the V-shaped groove is covered with a wedge-shaped sealing strip, and the top surface of the wedge-shaped sealing strip extends into the joint of the adjacent arc-shaped panel.

3. The granulator for organic fertilizer production according to claim 2, characterized in that, The arc-shaped panel is provided in four pieces, and the four arc-shaped panels are spliced ​​together to form the pressure roller surface.

4. The granulator for organic fertilizer production according to claim 3, characterized in that, The roller body is also equipped with a pair of cover plates; one cover plate is detachably fixed to one end of the roller body, and the other cover plate is detachably fixed to the other end of the roller body; one end of the pressure roller surface abuts against one cover plate, and the other end of the pressure roller surface abuts against the other cover plate, and the pair of cover plates axially limit the pressure roller surface.

5. The granulator for organic fertilizer production according to claim 4, characterized in that, A convex ring extends from the outer edge of the cover plate near the roller surface; concave rings that fit the convex ring are formed at both ends of the roller surface; the convex ring, the concave ring, and the roller body located inside the concave ring are all provided with coaxially arranged threaded holes, and a bolt is inserted into the threaded holes in sequence to fasten the convex ring, the concave ring, and the roller body together.

6. The granulator for organic fertilizer production according to any one of claims 1 to 5, characterized in that, It also includes a pair of symmetrically arranged scraper assemblies, one of which is disposed in the machine body below one of the rollers, and the other of which is disposed in the machine body below the other roller; The scraper assembly includes a blade holder and a scraper body fixed to the blade holder; the length direction of both the blade holder and the scraper body is distributed along the axial direction of the roller; one blade holder is fixed to one inner wall surface of the machine body, and the other blade holder is fixed to the other inner wall surface of the machine body; the scraper body and the blade holder are inclined so that the blade of the scraper body contacts the surface of the pressure roller and is distributed perpendicularly to the surface of the pressure roller.

7. The granulator for organic fertilizer production according to claim 6, characterized in that, It also includes a pair of symmetrically arranged purging assemblies, one of which is disposed in the machine body above one of the rollers, and the other of which is disposed in the machine body above the other roller; The purging assembly includes an air supply pipe and multiple nozzles. The length of the air supply pipe is distributed along the axial direction of the roller, and the multiple nozzles are evenly distributed along the length of the air supply pipe. The central axis of the nozzle and the surface of the pressure roller have a specified angle of less than 60°. The specified angle is the angle between the central axis of the nozzle and the surface of the pressure roller that is closer to the top of the machine body and closer to the nozzle. Each of the purging components is equipped with an air supply device.

8. The granulator for organic fertilizer production according to claim 7, characterized in that, The machine body is also equipped with a pair of baffles. One of the baffles is disposed between the nozzle of the blowing assembly and the feed inlet of the machine body, and is disposed close to the nozzle of the blowing assembly.

9. The granulator for organic fertilizer production according to claim 8, characterized in that, The baffle has a fixing hole, and the air supply pipe is installed through the fixing hole.

10. The granulator for organic fertilizer production according to claim 9, characterized in that, It also includes a vacuuming component, which is located near the bottom of the body and includes a negative pressure device and a filter bag.

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