Rotary kiln fuel smashing and feeding mechanism based on RDF
By adopting a detachable extrusion chamber and cutting chamber design in the rotary kiln fuel crushing and feeding mechanism, the problem of difficult maintenance in the existing technology is solved, achieving efficient and continuous fuel feeding and combustion effects, and reducing operating costs and environmental impact.
Patent Information
- Application Number
- CN202423024000.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-09
AI Technical Summary
In existing rotary kiln fuel crushing and feeding mechanisms, the extrusion chamber and cutting chamber are designed as a single unit, which is not easy to disassemble separately, resulting in difficulties in maintenance and cleaning, and increasing downtime and maintenance costs.
The extrusion and cutting chambers are designed with detachability. The extrusion rollers and rotating cutting blades extrude and cut RDF into fuel particles of a certain size, which are then fed into the rotary kiln combustion chamber by a feeding screw. The detachability of the components improves the convenience and continuity of maintenance.
It simplifies maintenance and cleaning processes, reduces downtime, improves production efficiency and equipment reliability, enhances fuel density and combustion efficiency, and reduces energy waste and harmful gas emissions.
Smart Images
Figure CN223649662U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of combustible solid fuel technology, specifically relating to a rotary kiln fuel crushing and feeding mechanism based on RDF. Background Technology
[0002] With increasing environmental awareness and the demand for efficient resource utilization, waste-to-resource technologies have received widespread attention. Among these, converting waste into Refuse-Derived Fuel (RDF) is an effective method of resource utilization. RDF is a type of solid pellet produced from municipal solid waste through processes such as sorting, crushing, and drying, and can be used as fuel. In rotary kiln combustion, RDF pellets are favored due to their high calorific value and excellent combustion characteristics.
[0003] In existing technologies, rotary kiln fuel crushing and feeding mechanisms typically include components such as a crusher, conveyor belt, and feeding screw, used to crush, convey, and feed RDF into the rotary kiln combustion chamber. However, these existing technologies have certain deficiencies in design, structure, and performance.
[0004] In many existing technologies, the extrusion and cutting chambers of a pulverizer are typically designed as a single unit, making them difficult to disassemble individually. This necessitates shutting down the entire feeding mechanism for maintenance and cleaning, increasing complexity and time costs. When components such as the extrusion rollers or cutting blades wear down and require replacement, the integrated design makes replacement more difficult and time-consuming, extending downtime and impacting production efficiency. Because the extrusion and cutting chambers cannot be disassembled separately, operators may need to use special tools or methods to clean the internal space and replace worn parts, which not only increases maintenance difficulty but may also cause additional damage to the equipment.
[0005] In view of this, we propose an RDF-based rotary kiln fuel crushing and feeding mechanism that allows for easy separation of the extrusion chamber and the cutting chamber, greatly simplifying maintenance and cleaning, reducing downtime, and improving production efficiency and equipment reliability. Utility Model Content
[0006] The present invention aims to solve the technical problem in the prior art where the extrusion chamber and the cutting chamber are usually designed as a whole, which is not easy to disassemble separately, resulting in difficulties in maintenance and cleaning.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A rotary kiln fuel pulverizing and feeding mechanism based on RDF includes an extrusion mechanism for receiving RDF pulverized by a pulverizer and extruding the RDF into fuel particles of a certain size, and a feeding mechanism for feeding the extruded fuel particles into the combustion chamber of the rotary kiln.
[0009] The extrusion mechanism includes a receiving port, a detachable extrusion chamber, and a cutting chamber. The extrusion rollers in the extrusion chamber extrude the RDF towards the cutting chamber, and the rotating cutting blades in the cutting chamber cut the extruded RDF while pushing the cut fuel pellets to the inclined feed plate.
[0010] The feeding mechanism includes a feed inlet for receiving fuel pellets conveyed by an inclined feed plate, a feed screw for conveying the fuel pellets, and a feed nozzle for feeding the fuel pellets into the rotary kiln combustion chamber.
[0011] The detachable design of the extrusion mechanism makes maintenance and cleaning easier. The rotating cutting blades inside the cutting chamber can cut and push fuel pellets simultaneously, improving the continuity and efficiency of the feed. The detachable nature of individual components (such as the extrusion rollers and cutting blades) makes it easier and faster to replace worn parts, reducing downtime.
[0012] By extruding RDF into fuel particles of a specific size, fuel density can be increased, combustion efficiency improved, and energy waste reduced. Uniform fuel particles contribute to the stability of the combustion process within the rotary kiln, reducing potential fluctuations and facilitating control of combustion temperature and atmosphere. Furthermore, the uniform size of RDF fuel particles helps reduce emissions of harmful gases and particulate matter, mitigating environmental impact.
[0013] Preferably, an extrusion discharge plate with a number of evenly distributed circular holes is fixedly installed at the bottom of the extrusion chamber. Four extrusion rollers are arranged in a ring at equal intervals inside the extrusion chamber. The extrusion rollers extrude the pulverized RDF through the circular holes into the cutting chamber. An extrusion motor that drives the extrusion rollers is fixedly installed on the outer side of the extrusion chamber. The uniform distribution of the circular holes helps to extrude the RDF evenly into the cutting chamber.
[0014] Preferably, an annular ring is fixedly provided on the outer side of the bottom of the extrusion chamber, and four connecting blocks are arranged equidistantly in a ring on the outer side of the top of the cutting chamber. The extrusion chamber and the cutting chamber are fixed together by bolts passing through the annular ring and the connecting blocks. A motor base A for mounting the extrusion motor is fixed on the annular ring. Through the connection of the annular ring, the connecting blocks, and the bolts, the extrusion chamber and the cutting chamber can be firmly fixed together, increasing the stability of the overall structure.
[0015] Preferably, a support ring is fixedly installed inside the cutting chamber, and the extrusion plate is inserted into the mounting groove formed by the support ring and the cutting chamber. The support ring provides additional support, ensuring the correct position of the extrusion plate inside the cutting chamber and preventing displacement due to vibration or other factors. The support ring is made of wear-resistant material to reduce wear when in contact with the extrusion plate, extending the service life of the equipment.
[0016] Preferably, a rotating shaft driven by a drive motor is rotatably connected inside the cutting chamber. The rotating shaft is bolted to the cutting blade, and the cutting chamber is mounted and fixed on the frame. The bolted connection is designed to be detachable, so that the blade can be quickly replaced when it is worn or damaged, reducing downtime.
[0017] Preferably, a motor mount B is fixed on the frame, and the drive motor is fixed on the motor mount B. The pulley A at the output end of the drive motor is connected to the pulley B via a transmission belt. The pulley B is located at the front end of the rotating horizontal shaft on the frame, and the bevel gear A on the horizontal shaft meshes with the bevel gear B at the bottom of the rotating shaft. The meshing of bevel gear A and bevel gear B allows power to be transmitted from the horizontal shaft to the rotating shaft, achieving precise power distribution and motion control.
[0018] Preferably, the feeding screw is located inside the screw conveyor cylinder and is driven by a conveying motor at the end of the screw conveyor cylinder, and the bottom of the screw conveyor cylinder is connected to the frame through a feeding rack.
[0019] Preferably, dust covers are fastened to the feed inlet and the inclined discharge plate. These dust covers effectively prevent dust and particulate matter from spreading into the working environment, thus improving air quality.
[0020] Preferably, the material inlet is located on the dust cover at the top of the extrusion chamber. This helps prevent external dust and impurities from entering the extrusion chamber.
[0021] Compared with the prior art, the technical effects and advantages of this utility model are:
[0022] This RDF-based rotary kiln fuel pulverizing and feeding mechanism feeds pulverized RDF into an extrusion mechanism via a receiving port. During rotation, the extrusion rollers within the extrusion chamber push the RDF towards the cutting chamber, applying pressure to compress it into fuel particles of a specific size. Subsequently, rotating cutting blades within the cutting chamber cut the compressed RDF into even smaller particles, pushing them towards an inclined discharge plate. Finally, the feeding mechanism delivers the cut fuel particles via a feeding screw into the rotary kiln combustion chamber, achieving continuous and uniform feeding.
[0023] By extruding RDF into fuel particles of a specific size, the density of the fuel is increased, combustion efficiency is improved, and energy waste is effectively reduced. At the same time, uniform fuel particles help maintain the stability of the combustion process within the rotary kiln, reducing fluctuations during combustion and facilitating control of combustion temperature and atmosphere, thereby achieving a more efficient and environmentally friendly combustion effect.
[0024] Removable components facilitate maintenance and cleaning, reducing downtime. The rotating cutting blades simultaneously cut and push fuel pellets, improving feeding continuity and efficiency. Wear-resistant materials and structural design of components such as the extrusion mechanism and cutting blades extend the equipment's lifespan, reduce maintenance and replacement frequency, and further lower operating costs. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of this utility model;
[0026] Figure 2 This is a schematic diagram of the structure of the present invention after the dust cover has been removed;
[0027] Figure 3 This is a schematic diagram of the extrusion chamber and cutting chamber of this utility model;
[0028] Figure 4 This is an exploded view of the extrusion chamber and the cutting chamber of this utility model;
[0029] Figure 5 This is a schematic diagram of the extrusion chamber of this utility model;
[0030] Figure 6 This is a schematic diagram of the cutting chamber of this utility model.
[0031] In the diagram: 1. Material inlet; 2. Dust cover; 3. Extrusion chamber; 4. Cutting chamber; 5. Rotating shaft; 6. Frame; 7. Motor base B; 8. Drive motor; 9. Pulley A; 10. Transmission belt; 11. Pulley B; 12. Horizontal shaft; 13. Bevel gear A; 14. Bevel gear B; 15. Inclined discharge plate; 16. Feed inlet; 17. Discharge nozzle; 18. Screw conveyor; 19. Conveyor motor; 20. Feeding rack; 21. Dust cover; 22. Extrusion roller; 23. Round hole; 24. Extrusion discharge plate; 25. Extrusion motor; 26. Annular ring; 27. Connecting block; 28. Bolt; 29. Motor base A; 30. Support ring; 31. Cutting blade. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.
[0034] This application discloses an RDF-based rotary kiln fuel pulverizing and feeding mechanism, including an extrusion mechanism for receiving RDF pulverized from a pulverizer and extruding the RDF into fuel particles of a certain size, and a feeding mechanism for feeding the extruded fuel particles into the rotary kiln combustion chamber.
[0035] The extrusion mechanism includes a receiving port 1, a detachable extrusion chamber 3 and a cutting chamber 4. The extrusion roller 22 in the extrusion chamber 3 extrudes the RDF toward the cutting chamber 4. The rotating cutting blade 31 in the cutting chamber 4 cuts the extruded RDF and pushes the cut fuel particles to the inclined feeding plate 15.
[0036] The material inlet 1 is located on the dust cover 2 at the top of the extrusion chamber 3. This helps prevent external dust and impurities from entering the extrusion chamber 3, ensuring the quality of the RDF. The design of the top material inlet 1 makes it easier to add material into the extrusion chamber 3, and also facilitates observation and operation. The dust cover 2 protects the precision components inside the extrusion mechanism, reduces the damage from dust and corrosive substances, and extends the service life of the equipment.
[0037] An extrusion discharge plate 24 with a plurality of evenly distributed circular holes 23 is fixedly installed at the bottom of the extrusion chamber 3. Four extrusion rollers 22 are arranged in a ring at equal intervals inside the extrusion chamber 3. The pulverized RDF is extruded through the circular holes 23 into the cutting chamber 4 via the extrusion rollers 22. An extrusion motor 25, which drives the extrusion rollers 22, is fixedly installed on the outer side of the extrusion chamber 3. The uniform distribution of the circular holes 23 helps to uniformly extrude the RDF into the cutting chamber 4, ensuring that the size and shape of the fuel particles are consistent. The presence of the circular holes 23 helps to reduce the resistance of the material during the extrusion process, thus reducing energy consumption. By extruding the pulverized RDF through the circular holes 23 via the extrusion rollers 22, the RDF can be converted into pellet fuel more efficiently.
[0038] An annular ring 26 is fixedly mounted on the outer side of the bottom end of the extrusion chamber 3, and four mating blocks 27 are arranged equidistantly in a ring on the outer side of the top end of the cutting chamber 4. The extrusion chamber 3 and the cutting chamber 4 are fixed together by bolts 28 passing through the annular ring 26 and the mating blocks 27. A motor mount A29 for mounting the extrusion motor 25 is fixedly mounted on the annular ring 26. Through the connection of the annular ring 26, the mating blocks 27, and the bolts 28, the extrusion chamber 3 and the cutting chamber 4 can be firmly fixed together, increasing the stability of the overall structure. This design allows the extrusion chamber 3 and the cutting chamber 4 to be easily separated when needed, facilitating cleaning and maintenance. The bolt connection 28 ensures precise alignment between the extrusion chamber 3 and the cutting chamber 4, avoiding performance degradation caused by misalignment. The motor mount A29 fixed on the annular ring 26 provides a stable mounting position for the extrusion motor 25, helping to ensure stable motor operation and power transmission.
[0039] A support ring 30 is fixedly installed inside the cutting chamber 4, and the extrusion plate 24 is inserted into the mounting groove formed by the support ring 30 and the cutting chamber 4. The support ring 30 provides additional support, ensuring the correct position of the extrusion plate 24 within the cutting chamber 4 and preventing displacement due to vibration or other factors. The support ring 30 is made of wear-resistant material to reduce wear when in contact with the extrusion plate 24, extending the service life of the equipment.
[0040] A rotating shaft 5, driven by a drive motor 8, is rotatably connected inside the cutting chamber 4. The rotating shaft 5 is connected to the cutting blade 31 via bolts 28. The cutting chamber 4 is fixedly mounted on the frame 6. The connection between the rotating shaft 5 and the cutting blade 31 via bolts 28 ensures the stability and accuracy of the blade during the cutting process, which is beneficial for obtaining a high-quality cut surface. The bolt connection 28 is designed to be detachable, so that the blade can be quickly replaced when it is worn or damaged, reducing downtime. Fixing the cutting chamber 4 to the frame 6 provides a safe operating environment for the operator, avoiding the risks that may be caused by the high-speed rotation of the cutting blade 31. The fixed installation of the frame 6 provides support for the cutting chamber 4, ensuring that the cutting chamber 4 does not generate excessive vibration even during high-speed cutting, thereby ensuring the accuracy and repeatability of the cutting.
[0041] A motor base B7 is fixed on the frame 6. The drive motor 8 is fixed on the motor base B7. The pulley A9 at the output end of the drive motor 8 is connected to the pulley B11 via the transmission belt 10. The pulley B11 is located at the front end of the rotating horizontal shaft 12 on the frame 6. The bevel gear A13 on the horizontal shaft 12 meshes with the bevel gear B14 at the bottom of the rotating shaft 5.
[0042] Motor mount B7 is fixed to frame 6, providing a stable mounting platform for drive motor 8 and ensuring that the motor does not generate excessive vibration during operation. Pulley A9 and pulley B11 at the output end of drive motor 8 are connected by transmission belt 10. This transmission method is simple and reliable, effectively transmitting power while being easy to maintain and replace. The meshing of bevel gears A13 and B14 allows power to be transmitted from horizontal shaft 12 to rotating shaft 5, achieving precise power distribution and motion control.
[0043] The feeding mechanism includes a feed inlet 16 for receiving fuel pellets conveyed by the inclined feed plate 15, a feed screw for conveying the fuel pellets, and a discharge nozzle 17 for feeding the fuel pellets into the rotary kiln combustion chamber.
[0044] Dust covers 21 are fastened to the feed inlet 16 and the inclined discharge plate 15. The dust covers 21 on the feed inlet 16 and the inclined discharge plate 15 effectively prevent dust and particulate matter from spreading into the working environment, improving air quality. The dust covers 21 reduce the risk of operators inhaling or being exposed to harmful particles, improving workplace safety. The fastening design of the dust covers 21 generally facilitates disassembly and cleaning, helping to maintain the cleanliness and good working condition of the equipment.
[0045] The feeding screw is located inside the screw conveyor drum 18 and is driven by the conveying motor 19 at the end of the screw conveyor drum 18. The bottom of the screw conveyor drum 18 is connected to the frame 6 via the feeding rack 20. The rotation of the feeding screw inside the screw conveyor drum 18 makes the conveying structure more compact and saves space. The design of the screw conveyor drum 18 can improve the material conveying efficiency and reduce friction and wear of the material during the conveying process.
[0046] The detachable design of the extrusion mechanism makes maintenance and cleaning easier. The rotating cutting blade 31 in the cutting chamber 4 can cut and push fuel particles simultaneously, improving the continuity and efficiency of feeding. The detachability of various components (such as the extrusion roller 22, cutting blade 31, etc.) makes it easier and faster to replace worn parts, reducing downtime.
[0047] This rotary kiln fuel pulverizing and feeding mechanism is based on RDF. The RDF is typically pulverized into smaller fragments before entering the feeding mechanism. This step aims to reduce the volume of the RDF and increase its surface area to facilitate subsequent extrusion and combustion. The extrusion mechanism receives the pulverized RDF and compresses it into denser fuel particles. This process includes the following steps: The pulverized RDF enters the extrusion mechanism through the inlet 1. The RDF enters a removable extrusion chamber 3, which is equipped with extrusion rollers 22. As the extrusion rollers 22 rotate, they push the RDF towards the cutting chamber 4 while applying pressure, compressing it into fuel particles of a specific size.
[0048] During the extrusion process, RDF is pushed into the cutting chamber 4. The cutting chamber 4 is equipped with rotating cutting blades 31, which work on the following principle: the cutting blades 31 rotate under the drive of the drive motor 8, cutting the extruded RDF into smaller particles. At the same time as cutting, the cutting blades 31 also push the cut fuel particles toward the inclined feed plate 15.
[0049] The feeding mechanism is responsible for feeding the cut fuel pellets into the rotary kiln combustion chamber. The specific steps include: the inclined feed plate 15 feeds the fuel pellets to the feed inlet 16. The feed inlet 16 is connected to a feeding screw, which, through rotation, transports the fuel pellets to the discharge nozzle 17. The fuel pellets are finally fed into the rotary kiln combustion chamber through the discharge nozzle 17 for combustion.
[0050] The core of its overall working principle lies in transforming loose RDF into dense and uniform fuel particles through mechanical processing. This not only improves fuel combustion efficiency but also reduces pollutants generated during combustion. Furthermore, the design of the feeding mechanism ensures continuous and uniform fuel particle feeding, which is crucial for maintaining stable combustion conditions within the rotary kiln.
[0051] By extruding RDF into fuel particles of a specific size, fuel density can be increased, combustion efficiency improved, and energy waste reduced. Uniform fuel particles contribute to the stability of the combustion process within the rotary kiln, reducing potential fluctuations and facilitating control of combustion temperature and atmosphere. The uniform size of RDF fuel particles also helps reduce emissions of harmful gases and particulate matter, mitigating environmental impact.
[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A rotary kiln fuel pulverizing and feeding mechanism based on RDF, characterized in that, include: The extrusion mechanism is used to receive RDF from the crusher and extrude the RDF into fuel particles of a certain size. The extrusion mechanism includes a receiving port (1), a detachable extrusion chamber (3) and a cutting chamber (4). The extrusion roller (22) in the extrusion chamber (3) extrudes the RDF toward the cutting chamber (4). The cutting blade (31) rotating in the cutting chamber (4) cuts the extruded RDF and pushes the cut fuel particles to the inclined feed plate (15). The feeding mechanism is used to feed the extruded fuel pellets into the rotary kiln combustion chamber. The feeding mechanism includes a feed inlet (16) for receiving fuel pellets conveyed by the inclined feed plate (15), a feeding screw for conveying the fuel pellets, and a feed nozzle (17) for feeding the fuel pellets into the rotary kiln combustion chamber.
2. The rotary kiln fuel pulverizing and feeding mechanism based on RDF according to claim 1, characterized in that: The bottom of the extrusion chamber (3) is fixedly provided with an extrusion discharge plate (24) with several round holes (23) evenly distributed. The inside of the extrusion chamber (3) is provided with four extrusion rollers (22) arranged in a ring at equal distances. The crushed RDF is extruded through the round holes (23) to the cutting chamber (4) by the extrusion rollers (22). The outer side of the extrusion chamber (3) is fixedly provided with an extrusion motor (25) that drives the extrusion rollers (22) to rotate.
3. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 2, characterized in that: An annular ring (26) is fixedly provided on the outer side of the bottom end of the extrusion chamber (3), and four docking blocks (27) are arranged in annularly at equal intervals on the outer side of the top end of the cutting chamber (4). The extrusion chamber (3) and the cutting chamber (4) are fixed together by bolts (28) that pass through the annular ring (26) and the docking blocks (27). A motor base A (29) for installation with the extrusion motor (25) is fixedly provided on the annular ring (26).
4. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 2, characterized in that: A support ring (30) is fixedly installed inside the cutting chamber (4), and the extrusion plate (24) is inserted into the mounting groove formed by the support ring (30) and the cutting chamber (4).
5. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 1, characterized in that: The cutting chamber (4) is rotatably connected to a rotating shaft (5) driven by a drive motor (8). The rotating shaft (5) is connected to the cutting blade (31) by bolts. The cutting chamber (4) is mounted and fixed on the frame (6).
6. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 5, characterized in that: A motor base B (7) is fixed on the frame (6), and a drive motor (8) is fixed on the motor base B (7). The pulley A (9) at the output end of the drive motor (8) is connected to the pulley B (11) via the transmission belt (10). The pulley B (11) is located at the front end of the rotating horizontal shaft (12) on the frame (6). The bevel gear A (13) on the horizontal shaft (12) meshes with the bevel gear B (14) at the bottom of the rotating shaft (5).
7. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 5, characterized in that: The feeding screw is located inside the screw conveyor cylinder (18) and is driven by the conveying motor (19) at the end of the screw conveyor cylinder (18). The bottom of the screw conveyor cylinder (18) is connected to the frame (6) through the feeding rack (20).
8. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 1, characterized in that: Dust covers (21) are fastened to the feed inlet (16) and the inclined feed plate (15).
9. The RDF-based rotary kiln fuel pulverizing and feeding mechanism according to claim 1, characterized in that: The receiving port (1) is located on the dust cover (2) on the top of the extrusion chamber (3).