A kind of anti-blocking ring molding granulator for rice hull powder biomass granulation

Abstract

The application discloses a kind of rice hull powder biomass granulation forming anti-blocking ring mold granulator, belong to the technical field of biomass granulation equipment.The device includes rack and is set on the feeding unit, granulation unit and cutter assembly of rack, granulation unit includes rotary drive assembly, annular die and pressure roller assembly, annular die inside and pressure roller assembly form material extrusion forming space enclosed;Annular die is evenly arranged with several detachable forming terminal components, and the medium seepage groove is opened in the peripheral wall of the shaping terminal component, and the inside cooling cavity and the outside cooling cavity formed by the annular partition plate are arranged in the annular die, and the axial gradient temperature field can be formed.The device sets gradient cooling structure and dynamic anti-blocking extrusion structure according to the characteristics of rice hull powder granulation, effectively solves the problem that traditional ring die granulator die hole is easy to stick material, block, and the quality of granule forming is poor, stable operation, and is suitable for continuous granulation production of rice hull powder.

Description

Technical Field

[0001] This application relates to the technical field of biomass pelleting equipment, and in particular to an anti-clogging ring die pelleting device for rice husk powder biomass pelleting. Background Technology

[0002] Rice husk powder is an abundant, green, and environmentally friendly agricultural and forestry biomass raw material. After extrusion pelleting, it can be made into biomass fuel, feed pellets, and other products, with extremely high resource utilization value. The ring die pellet mill is the core equipment for rice husk powder pelleting. It mainly relies on the cooperation of pressure rollers and ring dies to extrude the material through the die holes, and then uses a cutter to cut it into pellets.

[0003] In related technologies, traditional ring die pelleting devices, when used for rice husk powder pelleting, suffer from severe frictional heat generation during the extrusion molding process due to the light texture, high fiber content, and poor thermal conductivity of rice husk powder. The temperature inside the die hole continues to rise, which easily causes the rice husk powder to soften at high temperatures and accumulate on the wall, leading to die hole blockage. This requires frequent shutdowns for cleaning, which seriously affects production efficiency.

[0004] Secondly, traditional ring dies are mostly one-piece die hole structures without segmented temperature control structures. The temperature of the die hole is consistent throughout the process, and there is no temperature difference between the material extrusion molding and shaping process. This can easily lead to problems such as loose particles, cracking, and uneven molding density, resulting in poor product molding quality.

[0005] Meanwhile, the gap between the pressure roller and the ring die in traditional pellet mills is mostly a fixed structure, and the gap cannot be dynamically adjusted during the pelleting process. When the amount of rice husk powder fed and the moisture content fluctuate, local material accumulation and compression are very likely to occur, which further aggravates the problem of die hole blockage.

[0006] In summary, existing ring die pelleting devices suffer from problems such as easy clogging, poor molding quality, weak adaptability, and low operational stability. Summary of the Invention

[0007] To prevent blockage of the forming channel inside the annular mold, this application provides an anti-clogging annular mold pelletizing device for rice husk powder biomass pelleting.

[0008] The anti-clogging ring die pelletizing device for rice husk powder biomass pelleting provided in this application adopts the following technical solution:

[0009] A clog-resistant ring die pelletizing device for rice husk powder biomass pelleting includes a frame, and a feeding unit and a pelletizing unit mounted on the frame and connected to each other. The frame is also equipped with a cutter assembly, which is positioned corresponding to the discharge side of the pelletizing unit. The pelletizing unit includes:

[0010] A rotary drive assembly is fixedly mounted on the frame and has a rotary drive end;

[0011] A ring-shaped mold is assembled on the rotary drive end of the rotary drive assembly;

[0012] The pressure roller assembly is assembled inside the annular mold, and the pressure roller assembly and the inner wall of the annular mold enclose a material extrusion molding space.

[0013] The annular mold is evenly provided with a number of through-type forming terminal components. One end of each forming terminal component is connected to the material extrusion forming space, and the other end faces the cutting assembly to form the discharge end. A cooling cavity is provided inside the annular mold. A medium permeation groove is provided on a part of the peripheral wall of the forming terminal component. The medium permeation groove connects the cooling cavity and the interior of the forming terminal component.

[0014] Optionally, the forming terminal component is divided into an extrusion forming section near the material extrusion forming space and a shaping section near the discharge end along the axial direction. The medium permeation groove is formed on the peripheral wall of the shaping section and does not extend to the extrusion forming section.

[0015] The ratio of the axial length of the extrusion section to the shaping section of the molded terminal component is 2.8 to 3.2:1.

[0016] Optionally, an annular partition plate is coaxially arranged inside the annular mold, which divides the cooling cavity into an independent inner cooling cavity and an outer cooling cavity. With the radial direction of the annular mold as the defining reference, the inner cooling cavity is arranged corresponding to the extrusion molding section of the forming terminal component, and the outer cooling cavity is arranged corresponding to the shaping section of the forming terminal component.

[0017] Both the inner and outer cooling chambers are filled with cooling media, and the temperature of the cooling media in the inner cooling chamber is higher than that in the outer cooling chamber.

[0018] Optionally, the annular mold is provided with a medium inlet and a medium outlet, the medium inlet being connected to the outer cooling cavity and the medium outlet being connected to the inner cooling cavity;

[0019] The annular partition plate is uniformly provided with cavity communication ports, so that the cooling medium sequentially passes through the medium inlet, the outer cooling cavity, the cavity communication port, the inner cooling cavity, and the medium outlet to form a unidirectional circulating cooling path, which constitutes an axial gradient temperature field in which the shaping section is cooled first and the extrusion forming section is cooled slowly afterwards.

[0020] Optionally, the pressure roller assembly includes at least two pressure rollers evenly distributed inside the annular mold, and a support base installed at both ends of each pressure roller, wherein the axial direction of each pressure roller is parallel to the axial direction of the annular mold.

[0021] An eccentric connector is provided on the support base. The eccentric connector has an eccentric rotating end and a transmission end. The eccentric rotating end is rotatably connected to the pressure roller. The transmission end is connected to an anti-blocking drive assembly. The anti-blocking drive assembly is used to drive the eccentric connector to rotate, thereby driving the pressure roller to rotate around the eccentric rotating end.

[0022] Optionally, the anti-blocking drive assembly includes positive and negative threaded screws, two sets of symmetrically arranged transmission nuts, and a hinged connecting rod, wherein the positive and negative threaded screws are externally connected to a drive motor;

[0023] The axial direction of the positive and negative threaded screws is parallel to the axial direction of the pressure roller. Two sets of transmission nuts are symmetrically sleeved at both ends of the positive and negative threaded screws. One end of the hinged connecting rod is hinged to the transmission nut, and the other end is hinged to the transmission end of the eccentric connector.

[0024] Optionally, the annular mold has assembly through holes that correspond one-to-one with the forming terminal components, and the outer wall of the forming terminal component is provided with a positioning step, which abuts against the inner wall of the annular mold.

[0025] An annular groove is reserved on the outer periphery of the assembly point between the discharge end of the molded terminal component and the annular mold, and a sealing ring is embedded in the groove.

[0026] Optionally, a throttling and guiding sleeve is fixedly installed at the cavity communication port. A conical guiding channel is formed inside the throttling and guiding sleeve. The large-diameter end of the conical guiding channel faces the outer cooling cavity, and the small-diameter end faces the inner cooling cavity.

[0027] The large-diameter end of the tapered flow channel faces the outer cooling cavity, and the small-diameter end faces the inner cooling cavity, which is used to limit the flow rate of the cooling medium.

[0028] Optionally, the frame is provided with a vertically arranged main support platform, the rotary drive assembly is fixedly installed on one side of the main support platform, and the annular mold is assembled on the other side of the main support platform away from the rotary drive assembly and is in transmission cooperation with the rotary drive assembly.

[0029] The end of the feeding unit facing the pelletizing unit is fastened and covered on the outside of the annular mold, and is sealed and fitted with the main support platform to form a closed pelletizing cavity. The cutter assembly is installed inside the sealed pelletizing cavity.

[0030] Optionally, the cutter assembly and the pressure roller assembly are arranged correspondingly to each other, and the cutter assembly is installed on the inner wall of the feeding unit facing the granulation chamber;

[0031] The cutting assembly includes a blade holder and a cutting body. The blade holder extends radially along the annular mold, and the cutting body is fixedly installed at one end of the blade holder facing the annular mold. The cutting end face of the cutting body is adapted to the discharge end face of the forming terminal component.

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

[0033] 1. This application features a segmented molding terminal component and a gradient cooling structure. The molding terminal component is divided into an extrusion molding section and a shaping section. A medium permeation groove is only provided in the shaping section, and the cooling chamber is divided into an independent inner and outer cooling chamber by an annular partition plate. Combined with a unidirectional circulating cooling path of the medium, an axial gradient temperature field is formed, with temperature control in the shaping section and a relatively high temperature in the extrusion molding section. This design is adapted to the molding characteristics of rice husk powder. The extrusion section ensures the material is fully compressed and compacted, while the shaping section rapidly cools and shapes the material, effectively preventing rice husk powder from sticking to the wall at high temperatures. This reduces the probability of die blockage and significantly increases continuous production time.

[0034] 2. This application is equipped with an eccentric adjustable pressure roller structure and an anti-clogging drive component driven by positive and negative screws, which can drive the pressure roller to rotate around the eccentric rotary end, realize the dynamic adaptive adjustment of the gap between the pressure roller and the inner wall of the annular mold, adapt to the fluctuation of rice husk powder feeding state and moisture content, implement the problem of material accumulation and compression, further improve the anti-clogging performance, and improve the stability of pelleting operation. Attached Figure Description

[0035] Figure 1 This is a partial cross-sectional view of an embodiment of this application.

[0036] Figure 2 This is a schematic diagram of a partial cross-sectional structure in front view of an embodiment of this application.

[0037] Figure 3 This application Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0038] Figure 4 This application Figure 2 Enlarged schematic diagram of the structure at point B.

[0039] Reference numerals: 1. Frame; 11. Main support platform; 2. Feeding unit; 3. Granulation unit; 31. Rotary drive assembly; 32. Annular die; 321. Annular partition plate; 33. Pressure roller assembly; 331. Pressure roller; 332. Support base; 333. Eccentric connector; 34. Forming terminal component; 340. Medium seepage groove; 341. Extrusion forming section; 342. Shaping section; 343. Positioning step; 4. Cutter assembly; 41. Blade holder; 42. Cutter body; 8. Anti-clogging drive assembly; 81. Positive and negative threaded rod; 82. Transmission nut; 83. Hinge connecting rod; 9. Sealing ring; 10. Throttling guide sleeve. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0041] This application discloses an anti-clogging ring die pelletizing device for rice husk powder biomass pelleting, mainly used to solve the problems of easy die clogging, poor molding stability, and low consistency of finished pellets when processing high-fiber, heat-absorbing, and easily sticky rice husk powder materials in traditional ring die pelleting equipment. (Refer to...) Figure 1 This anti-clogging ring die pelleting device for rice husk powder biomass pelleting includes a frame 1. The frame is equipped with a feeding unit 2 and a pelleting unit 3 that are interconnected and work together to complete the feeding and extrusion molding operations. The frame is also equipped with a cutter assembly 4, which is precisely positioned to correspond to the discharge side of the pelleting unit 3. The entire set of equipment can realize an integrated closed and continuous operation process of raw material conveying, high-pressure extrusion molding, axial gradient cooling and shaping, and fixed-length regular cutting, which is highly adapted to the long-term, large-scale industrial stable pelleting production needs of rice husk powder.

[0042] Reference Figure 1 A high-strength main support platform 11 is integrally and vertically arranged on the frame 1. As the core load-bearing plate of the whole machine, the main support platform 11 realizes the independent assembly of the power drive component and the extrusion molding component of the pelletizing unit 3, which can effectively buffer the vibration generated during the high-speed operation of the equipment and greatly improve the stability of the whole machine operation. The rotary drive component 31 is firmly fixedly installed on one side of the main support platform 11. The rotary drive end of the rotary drive component 31 penetrates through the plate of the main support platform 11 and forms a stable transmission cooperation with the annular mold 32 assembled on the side of the main support platform 11 opposite to the rotary drive component 31. It can continuously output uniform circumferential rotational power, providing a reliable motion foundation for the uniform extrusion molding of rice husk powder along the circumference of the annular mold.

[0043] The hollow area inside the annular mold 32 is the core area for material extrusion. The pressure roller assembly 33 is suspended and assembled inside the annular mold 32. The outer wall of the pressure roller assembly 33 and the inner wall of the annular mold 32 enclose an annular closed material extrusion molding space.

[0044] In this embodiment, the pressure roller assembly 33 includes at least two pressure rollers 331. All pressure rollers 331 are evenly arranged around the center of the annular mold 32. The axial direction of each pressure roller 331 is parallel to the axial direction of the annular mold 32, which can ensure that the material is subjected to uniform extrusion pressure at all parts of the annular mold circumference, thereby avoiding material accumulation, discharge jamming and hole blockage caused by local pressure imbalance.

[0045] Each pressure roller 331 is equipped with a support base 332 at both ends to complete the positioning support, ensuring that the structure is stable and does not shake when the pressure roller rotates at high speed. An eccentric connector 333 is rotatably mounted on the support base 332. One end of the eccentric connector 333 forms an eccentric rotating end and rotates with the pressure roller 331, while the other end serves as the force transmission end and is linked and connected with the anti-blocking drive component 8.

[0046] The anti-clogging drive component 8 can drive the eccentric connector 333 to deflect slightly, thereby causing the pressure roller 331 to swing slightly around the eccentric rotating end. It can dynamically and adaptively adjust the extrusion gap between the outer wall of the pressure roller 331 and the inner wall of the annular mold 32 in real time. It can adapt to the real-time fluctuations of the instantaneous feed amount of rice husk powder and the moisture content of raw materials, actively break the working condition of excessive accumulation and extrusion of local materials, reduce the probability of die blockage from the source of extrusion molding, and significantly improve the anti-clogging performance of the whole machine.

[0047] Reference Figure 1 and Figure 3 The anti-blocking drive assembly 8 includes a positive and negative threaded screw 81, two sets of symmetrically arranged transmission nuts 82, and multiple hinged connecting rods 83. The axial direction of the positive and negative threaded screw 81 is arranged parallel to the axial direction of the pressure roller 331. The two sets of transmission nuts 82 are symmetrically slidably sleeved on both ends of the positive and negative threaded screw 81. Each set of transmission nuts 82 is hinged to a hinged connecting rod 83. The end of the hinged connecting rod 83 away from the nut is hinged to the transmission end of the eccentric connector 333.

[0048] The forward and reverse threaded screws 81 are connected to an independent drive motor. When the motor drives the forward and reverse threaded screws 81 to rotate in the forward or reverse direction, the two sets of transmission screw nuts 82 can synchronously retract towards each other or separate and translate away from each other. Through the push-pull transmission action of the hinged connecting rod 83, the eccentric connecting piece 333 is driven to deflect. The adjustment range of the extrusion gap can be pre-calibrated according to the characteristics of the rice husk powder raw material. When the moisture content of the rice husk powder is too high or the instantaneous feed rate increases suddenly, the drive motor finely adjusts to expand the extrusion gap to alleviate the problem of material overload accumulation. When the raw material is dry and the feed rate is too low, the gap is appropriately reduced to ensure that the rice husk powder is fully extruded and bonded, and to ensure the density of the finished particles. The entire process realizes adaptive dynamic anti-blocking adjustment based on working conditions.

[0049] Reference Figure 2 and Figure 4 The annular mold 32 has uniformly spaced assembly through holes corresponding to the forming terminal components 34. Each set of assembly through holes can be detachably assembled with an independent forming terminal component 34. The forming terminal component 34 adopts a modular split structure, and when a single terminal is worn or partially blocked, it can be disassembled and replaced individually without replacing the entire annular mold 32, effectively reducing the cost of daily equipment maintenance and parts replacement. The outer wall of the forming terminal component 34 is integrally formed with a positioning step 343. After assembly, the positioning step 343 tightly abuts against the inner wall of the annular mold 32 to achieve axial limiting and locking, preventing axial movement, radial displacement, loosening and falling off of the forming terminal component 34 during high-speed operation of the equipment.

[0050] An annular groove is reserved on the outer periphery of the assembly gap between the discharge end of the forming terminal component 34 and the annular mold 32. A sealing ring 9 is tightly embedded in the groove. The sealing ring 9 can completely isolate the cooling medium inside the cooling chamber from the rice husk powder material inside the sealed granulation chamber. On the one hand, it prevents the cooling medium from leaking and contaminating the raw materials, causing the particles to break apart. On the other hand, it prevents the granulation dust from penetrating into the cooling chamber and blocking the flow channel of the medium, ensuring the long-term stable operation of the entire cooling system.

[0051] Along the axial direction of the material extrusion, the forming terminal component 34 is divided from front to back into an extrusion forming section 341 near the material extrusion forming space and a shaping section 342 near the discharge end. The axial length ratio of the extrusion forming section 341 to the shaping section 342 is strictly controlled within the range of 2.8 to 3.2:1. This ratio has been verified by multiple sets of rice husk powder granulation comparison tests. If the axial proportion of the extrusion forming section is too small, the rice husk powder cannot be fully compacted under high pressure, and the formed particles are loose and easy to crack and break. If the axial proportion of the shaping section is too small, the material cooling and heat exchange stroke is insufficient, and the high-temperature softened rice husk powder is very easy to adhere to the inner wall of the terminal and cause blockage.

[0052] Reference Figure 4 A medium permeation groove 340 is provided on the outer peripheral wall of the shaping section 342. The medium permeation groove 340 is distributed on the outer wall of the shaping section and does not extend to the extrusion forming section 341. The medium permeation groove 340 connects the cooling chamber and the interior of the forming terminal component. The groove opening size is designed to be extremely small, so that the cooling medium can only permeate into the interior of the forming terminal component in a small amount, forming a thin medium isolation film between the material and the inner wall of the terminal, which plays the role of lubrication, reducing sticking, and isolating and preventing sticking to the wall. The small amount of medium will not change the shape and structure of the particles, nor will it have an adverse effect on the normal continuous discharge of the material.

[0053] An annular partition plate 321 is coaxially fixedly assembled inside the annular mold 32. The annular partition plate 321 divides the overall cooling cavity inside the mold into an independent inner cooling cavity and an outer cooling cavity that do not cross-flow along the radial direction of the annular mold 32. Taking the radial direction of the annular mold 32 as the defining reference, the inner cooling cavity is arranged to completely cover the corresponding area of ​​the extrusion forming section 341 of the forming terminal component 34 along the axial direction, and the outer cooling cavity is arranged to completely cover the corresponding area of ​​the shaping section 342 of the forming terminal component 34 along the axial direction, so as to achieve precise alignment and zoned heat exchange between the radial double-layer cooling cavity and the axial segmented structure of the forming terminal.

[0054] The outer wall of the annular mold 32 has a medium inlet and a medium outlet respectively. The medium inlet is connected to the outer cooling cavity, and the medium outlet is connected to the inner cooling cavity. Multiple sets of cavity connection ports are evenly opened on the annular partition plate 321. A throttling guide sleeve 10 is fixedly embedded inside each cavity connection port. A conical guide channel is formed inside the throttling guide sleeve 10. The large diameter end of the conical guide channel faces the outer cooling cavity, and the small diameter end faces the inner cooling cavity. The conical channel structure is used to limit the flow and stabilize the pressure of the medium, stabilize the flow rate of the cooling medium, and avoid disordered flow of the medium and the mixing of hot and cold media that would damage the preset axial gradient temperature difference field.

[0055] This device is equipped with an independent external heat exchanger and a circulating pump, forming a complete closed-loop heat exchange circuit for the cooling medium. The outer wall of the annular mold 32 has a medium inlet and a medium outlet. The medium inlet connects to the outer cooling chamber, and the medium outlet connects to the inner cooling chamber. The medium inlet and outlet are connected to the external heat exchanger and circulating pump via a conventional rotating fluid transfer structure. This rotating fluid transfer structure is a mature existing technology, adaptable to the continuous rotation of the annular mold, preventing pipe twisting and ensuring leak-free medium delivery. The cooling medium is pressurized and delivered to the medium inlet by the circulating pump, first entering the outer cooling chamber to cool the shaping section 342. After being throttled and limited by the flow guide sleeve 10, the medium flows slowly through the cavity connection port into the inner cooling chamber, providing slow cooling and heat exchange to the extrusion forming section 341. After heat absorption and exchange, the medium flows out of the annular mold 32 from the medium outlet and returns to the external heat exchanger for centralized cooling and heat removal. The cooled medium is then reintroduced into the medium inlet for repeated use.

[0056] Relying on the external heat exchange device to continuously remove the frictional heat absorbed by the medium, the temperature of the cooling medium in the outer cooling chamber can be kept stable at a lower temperature than that in the inner cooling chamber for a long time. Finally, an axial gradient temperature field is formed in the axial direction of the forming terminal component 34, in which the shaping section is cooled quickly first and the extrusion forming section is cooled slowly.

[0057] The gradient temperature field is highly adapted to the specific molding process requirements of rice husk powder: the extrusion molding section 341 maintains a relatively suitable high temperature to ensure that the internal fibers of the rice husk powder soften appropriately and bond together, thereby improving the overall density and structural strength of the particles; the shaping section 342 uses the low-temperature medium in the outer cooling chamber to quickly exchange heat, so that the high-temperature particles that have just been extruded are quickly cooled, shaped and hardened. From the molding mechanism, this effectively inhibits the high-temperature softening and adhesion of rice husk powder to the inner wall of the terminal, greatly reduces the probability of die blockage, and significantly extends the continuous uninterrupted granulation operation time of the equipment.

[0058] The main support platform 11, which is vertically arranged on the frame 1, is sealed together with the feeding unit 2 to form a closed granulation chamber. The end of the feeding unit 2 facing the granulation unit 3 is fastened and covered to the outside of the annular mold 32. A sealing gasket is installed at the joint between the two to achieve complete sealing and isolation. All processes, including raw material conveying, high-pressure extrusion, granule discharge, and fixed-length cutting, are completed inside the sealed chamber, which can effectively prevent dust from overflowing and material from splashing, thus optimizing the cleanliness of the workshop working environment. The cutter assembly 4 is integrally installed inside the sealed granulation chamber and is arranged one-to-one with the pressure roller assembly 33 along the radial direction of the annular mold.

[0059] The cutter assembly 4 includes a cutter holder 41 and a cutter body 42. The cutter holder 41 extends radially along the annular mold 32 and is firmly fixedly installed on the inner wall of the feeding unit 2 facing the granulation chamber. The cutter body 42 is fixedly assembled at one end of the cutter holder 41 near the annular mold 32. The cutting end face of the cutter body 42 is precisely matched and parallel to the discharge end face of the forming terminal component 34. In this embodiment, the cutter body 42 adopts a fixed cutter body structure. When the annular mold 32 rotates and drives the particles to be extruded outward at a uniform speed, the cutter body 42 can continuously cut the extruded long strip particles to a fixed length, and the produced finished particles have a uniform and regular length and a smooth and flat cross-section.

[0060] The workflow of the anti-clogging ring die pelleting device for rice husk powder biomass pelleting disclosed in this application is as follows: Pre-treated rice husk powder raw material is smoothly and evenly fed into the closed, sealed pelleting chamber via the feeding unit 2; the rotary drive assembly 31 drives the ring die 32 to rotate at a uniform and stable speed, and, in conjunction with multiple sets of pressure rollers 331 evenly arranged around the internal circumference, continuously applies high-pressure extrusion and pushing to the rice husk powder; the material sequentially passes through the extrusion molding section 341 of the molding terminal component 34 to complete high-pressure compaction and bonding, and then enters the shaping section 342, where it is rapidly cooled and shaped by the low-temperature medium in the outer cooling chamber before being continuously extruded outwards; pelleting process... Throughout the entire process, the anti-blocking drive component 8 can dynamically adjust the extrusion gap between the pressure roller 331 and the inner wall of the annular die 32 according to the real-time feed rate and raw material moisture content, actively eliminating material accumulation, extrusion overload and other material blockage risks; the extruded long strip pellets continuously contact the cutter body 42 to complete fixed-length cutting, resulting in rice husk biomass fuel pellets with uniform specifications and qualified density; the cooling medium circulates in a closed loop between the outer cooling chamber, the inner cooling chamber and the external heat exchange device throughout the process, continuously removing the heat generated by die friction, and stably maintaining the axial gradient cooling environment, enabling the equipment to achieve long-term uninterrupted and stable pelleting production.

[0061] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A clog-resistant ring die pelletizing device for rice husk powder biomass pelleting, comprising a frame, and a feeding unit and a pelletizing unit mounted on the frame and connected to each other, wherein the frame is further equipped with a cutter assembly, the cutter assembly being disposed corresponding to the discharge side of the pelletizing unit, characterized in that, The granulation unit includes: A rotary drive assembly is fixedly mounted on the frame and has a rotary drive end; A ring-shaped mold is assembled on the rotary drive end of the rotary drive assembly; The pressure roller assembly is assembled inside the annular mold, and the pressure roller assembly and the inner wall of the annular mold enclose a material extrusion molding space. The annular mold is evenly provided with a number of through-type forming terminal components. One end of each forming terminal component is connected to the material extrusion forming space, and the other end faces the cutting assembly to form the discharge end. A cooling cavity is provided inside the annular mold. A medium permeation groove is provided on a part of the peripheral wall of the forming terminal component. The medium permeation groove connects the cooling cavity and the interior of the forming terminal component.

2. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 1, characterized in that: The forming terminal component is divided into an extrusion forming section near the material extrusion forming space and a shaping section near the discharge end along the axial direction. The medium permeation groove is opened on the peripheral wall of the shaping section and does not extend to the extrusion forming section. The ratio of the axial length of the extrusion section to the shaping section of the molded terminal component is 2.8 to 3.2:

1.

3. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 2, characterized in that: The annular mold has an annular partition plate coaxially arranged inside, which divides the cooling chamber into an independent inner cooling chamber and an outer cooling chamber. The inner cooling chamber is arranged to correspond to the extrusion molding section of the forming terminal component, and the outer cooling chamber is arranged to correspond to the shaping section of the forming terminal component. Both the inner and outer cooling chambers are filled with cooling media, and the temperature of the cooling media in the inner cooling chamber is higher than that in the outer cooling chamber.

4. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 3, characterized in that: The annular mold is provided with a medium inlet and a medium outlet. The medium inlet is connected to the outer cooling cavity, and the medium outlet is connected to the inner cooling cavity. An external heat exchange device and a circulating pump are connected to the annular mold. The annular partition plate is uniformly provided with cavity communication ports, so that the cooling medium flows back to the external heat exchange device in sequence through the medium inlet, the outer cooling cavity, the cavity communication port, the inner cooling cavity, and the medium outlet, forming a unidirectional circulating cooling path and creating an axial gradient temperature field in which the shaping section is cooled first and the extrusion forming section is cooled slowly afterwards.

5. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 1, characterized in that: The pressure roller assembly includes at least two pressure rollers evenly distributed inside the annular mold, and a support base installed at both ends of each pressure roller, with the axial direction of each pressure roller being parallel to the axial direction of the annular mold. An eccentric connector is provided on the support base. The eccentric connector has an eccentric rotating end and a transmission end. The eccentric rotating end is rotatably connected to the pressure roller. The transmission end is connected to an anti-blocking drive component. The anti-blocking drive component is used to drive the eccentric connector to rotate, thereby driving the pressure roller to rotate around the eccentric rotating end, and dynamically adjusting the extrusion gap between the pressure roller and the inner wall of the annular mold.

6. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 5, characterized in that: The anti-blocking drive assembly includes positive and negative threaded screws, two sets of symmetrically arranged transmission nuts, and a hinged connecting rod. The positive and negative threaded screws are externally connected to a drive motor. The axial direction of the positive and negative threaded screws is parallel to the axial direction of the pressure roller. Two sets of transmission nuts are symmetrically sleeved at both ends of the positive and negative threaded screws. One end of the hinged connecting rod is hinged to the transmission nut, and the other end is hinged to the transmission end of the eccentric connector.

7. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 1, characterized in that: The annular mold has assembly through holes that correspond one-to-one with the forming terminal components. The outer wall of the forming terminal component is provided with a positioning step, and the positioning step abuts against the inner wall of the annular mold. An annular groove is reserved on the outer periphery of the assembly point between the discharge end of the molded terminal component and the annular mold, and a sealing ring is embedded in the groove.

8. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 4, characterized in that: A throttling and guiding sleeve is fixedly installed at the cavity connection port, and a conical guiding channel is formed inside the throttling and guiding sleeve; The large-diameter end of the tapered flow channel faces the outer cooling cavity, and the small-diameter end faces the inner cooling cavity, which is used to limit the flow rate of the cooling medium.

9. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 1, characterized in that: The frame is provided with a vertically arranged main support platform. The rotary drive assembly is fixedly installed on one side of the main support platform. The annular mold is assembled on the other side of the main support platform away from the rotary drive assembly and is in transmission cooperation with the rotary drive assembly. The end of the feeding unit facing the pelletizing unit is fastened and covered on the outside of the annular mold, and is sealed and fitted with the main support platform to form a closed pelletizing cavity. The cutter assembly is installed inside the sealed pelletizing cavity.

10. The anti-clogging ring die pelletizing device for rice husk powder biomass pelletizing according to claim 9, characterized in that: The cutter assembly and the pressure roller assembly are arranged correspondingly to each other, and the cutter assembly is installed on the inner wall of the feeding unit facing the granulation chamber; The cutting assembly includes a blade holder and a cutting body. The blade holder extends radially along the annular mold, and the cutting body is fixedly installed at one end of the blade holder facing the annular mold. The cutting end face of the cutting body is adapted to the discharge end face of the forming terminal component.

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