A low energy granulator

Abstract

The low-energy granulator provided by the application relates to the technical field of granulators and specifically relates to a low-energy granulator, which comprises a granulating mechanism for extruding and forming, a permanent magnet motor in driving connection with the granulating mechanism, a lower feeding mechanism in connection with the granulating mechanism, an upper feeding mechanism in communication with the lower feeding mechanism, the granulating mechanism being in closed connection with the lower feeding mechanism, and the lower feeding mechanism and the upper feeding mechanism being in closed connection; the permanent magnet motor is connected with a buffer vibration assembly, and the lower feeding mechanism is connected with a crushing and suction structure. The low-energy granulator can reduce the energy consumption of biological granulation, adopts a permanent magnet motor, and the rotor is hollow, which helps to increase the stability of the system; meanwhile, the buffer vibration assembly is designed, which helps to accelerate the granulation efficiency; meanwhile, an automatic feeding function is designed, thereby saving manpower and cost.

Description

Technical Field

[0001] This invention belongs to the field of pellet mill technology, specifically relating to a low-energy pellet mill. Background Technology

[0002] Energy conservation and environmental protection are key concerns worldwide. Therefore, high-efficiency, novel, energy-saving, and environmentally friendly products have become a focus of research. A biofuel pellet mill is a device used to compress biomass materials such as sawdust, straw, and rice husks into pellet-shaped fuel. By feeding the raw materials into a pressure chamber inside the equipment, they are compressed into pellets under high pressure. Biofuel pellets can serve as an alternative to traditional petroleum fuels, offering advantages such as high calorific value and low pollution. However, existing small and medium-sized biofuel pellet mills present the following technical challenges in operation: (1) Currently, pellet mills generally use a motor to drive the pressure roller seat to rotate. The motor is connected to the pressure roller seat through a reduction mechanism. The design of the reduction mechanism will increase wear and lubrication oil consumption. In addition, the current motor drive also has technical problems of low operating stability and large rotation fluctuation. (3) It does not have an automatic feeding function and mostly relies on manual feeding, which is time-consuming and labor-intensive, greatly increasing labor costs and affecting production efficiency. In addition, a large amount of dust and impurities will be generated during the discharge, affecting the surrounding environment.

[0003] This solution proposes a low-energy pellet mill to address the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a low-energy pellet mill that solves the technical problem of how to reduce energy consumption in bio-granulation. It adopts a permanent magnet motor with a hollow rotor, which helps to increase the stability of the system. At the same time, it is designed with a vibration buffer component to help accelerate the pelleting efficiency. It also has an automatic feeding function to save manpower and costs.

[0005] A low-energy pellet mill includes a pelletizing mechanism for extrusion forming, a permanent magnet motor driven by the pelletizing mechanism, a lower feeding mechanism connected to the pelletizing mechanism, and an upper feeding mechanism communicating with the lower feeding mechanism. The pelletizing mechanism is closedly connected to the lower feeding mechanism, and the lower feeding mechanism and the upper feeding mechanism are closedly connected. The permanent magnet motor is connected to the buffer vibration assembly, and the lower feeding mechanism is connected to the crushing and suction structure.

[0006] The pelletizing mechanism includes a ring die base, a ring die coaxially fixed on the ring die base, a pressure roller rotatably mounted on the pressure roller base, a pressure roller shaft passing through the center of the pressure roller, and a locking and limiting structure connected to the pressure roller shaft. A gap is provided between the pressure roller and the inner side of the ring die. The inner side of the ring die is provided with a pressure roller base, and the outer side is provided with a shell. The bottom end face of the pressure roller seat is coaxially connected to the fixed shaft, and the fixed shaft is set through the center of the permanent magnet motor; A bearing is coaxially mounted at one end near the fixed shaft, and a locking structure is connected to the other end of the fixed shaft. A pelletizing structure and an arc-shaped rod are also provided on the outer side of the ring die. The arc-shaped rod is arranged opposite to the pelletizing structure and is connected to the inner side of the outer shell through a positioning block.

[0007] More preferably, a heater is provided on the outside of the arc-shaped rod; the heater can be used to heat the contact ring die area, which helps to further dry the pellets.

[0008] To simplify the design, the ring mold base, pressure roller base, and fixed shaft in this scheme are not shown in the attached drawings. This is hereby noted.

[0009] The permanent magnet motor includes a stator, a rotor disposed inside the stator, and a hollow shaft passing through the center of the rotor. The bearing is connected to the hollow shaft, and the fixed shaft passes coaxially through the hollow shaft. The hollow shaft is coaxially and fixedly driven to the ring mold base; The vibration damping assembly includes a pressure plate that contacts the outside of the stator, a spring that is fixedly connected to the pressure plate at one end, and a limiting post that passes through the inside of the spring. One end of the limiting post is ball-jointed to a positioning rod, and the positioning rod is fixedly connected to the upper feeding mechanism.

[0010] The lower feeding mechanism includes a positioning plate, a push shaft passing through the center of the positioning plate, multiple feeding blades connected to the outside of the push shaft, a first conveyor cylinder coaxially connected to one side of the positioning plate and a second conveyor cylinder coaxially connected to the other side of the positioning plate, a housing coaxially connected to the positioning plate, the housing coaxially sleeved on the outside of the second conveyor cylinder, a discharge port at the bottom of the housing and a steam extraction port at the top, and the push shaft connected to a rotary power mechanism. The upper end face of the conveyor cylinder is connected to the bottom end of the vertical channel, and a manual feed port is provided on the outer side of the vertical channel.

[0011] The rotary power mechanism includes a power motor and a second transmission belt, which is connected to a pulley at one end of the push shaft.

[0012] The upper feeding mechanism includes a horizontal channel with one end connected to the top of the vertical channel, a material receiving trough plate connected to the other end of the horizontal channel, a spiral feeding structure passing through the horizontal channel and the material receiving trough plate, and a crushing structure disposed on the material receiving trough plate.

[0013] The spiral feeding structure includes a feeding shaft, a spiral blade sleeved on the outside of the feeding shaft, and a rotary motor connected to the feeding shaft.

[0014] The pulverizing structure includes a horizontally arranged stirring shaft and multiple stirring blades arranged outside the stirring shaft. One end of the stirring shaft is connected to a drive motor via a transmission belt.

[0015] The crushing and suction structure includes a horizontal rod fixed inside the vertical channel, a column rotatably connected to the horizontal rod, a cutting blade fixed to the top of the column, a fan fixed to the bottom of the column, a bevel gear one coaxially connected to the column, a bevel gear two meshing with the bevel gear one, and a drive gear shaft passing through the center of the bevel gear two. The drive gear shaft is connected to the push shaft via a power belt.

[0016] The locking and limiting structure includes a locking gear coaxially connected to the pressure roller shaft, a protrusion fixed to the outside of the locking gear, and two threaded rods with one end abutting against both sides of the protrusion. The other end of the threaded rod passes through the fixing block and is provided with a nut.

[0017] The pelletizing structure includes a telescopic cylinder and a scraper blade fixedly connected to the free end of the telescopic cylinder, with the scraper blade positioned near the outer side of the ring die.

[0018] Multiple pelletizing structures can be designed, located at different positions on the outside of the ring die, in order to increase pelletizing efficiency.

[0019] This invention achieves the following significant effects: (1) A hollow shaft is provided, and a fixed shaft is inserted in the hollow shaft. Since the iron core has no potential mechanical loss, the motor operation stability is very reliable. Moreover, its volume and weight are free from the limitations of the traditional iron core, and there is a lot of room for expansion design. The fluctuation frequency and time of the hollow motor are much smaller than those of the traditional motor. Moreover, the hollow shaft design allows the fixed shaft to be directly connected to the permanent magnet motor, eliminating the need for a gear reduction mechanism and avoiding wear and lubrication consumption. (2) The permanent magnet motor designed in this scheme eliminates the excitation winding, carbon brush and slip ring structure of the excitation generator, reducing the number of fault points and wear parts, and improving the reliability of operation compared with ordinary motors. (3) Design a lower feeding structure and an upper feeding structure. You only need to place the material in the material receiving trough. Under the action of spiral feeding and gravity, the material continuously enters the pressure roller and the ring die, saving manpower and cost and improving production efficiency. (4) Although the permanent magnet hollow motor provided in this solution has the effect of reducing mechanical loss, due to the bearing design, it is easy to cause large impact vibration of the motor. The hollow motor is severely demagnetized under severe vibration, which affects the performance of the permanent magnet motor and affects the stability during long-term use. It is more suitable for low-speed operation. Therefore, in order to solve this problem, this solution designs a buffer vibration structure and an arc rod. By elastically limiting the outside of the stator, the rotor can be promoted to run at high speed. At the same time, the arc rod is attached to the outside of the ring die to close it, so that the area of ​​the ring die near the pelletizing structure is exposed, thus avoiding large pellet size. (5) The crushing and suction structure designed in this scheme has the following technical advantages: One method is to use a cutting blade to cut the falling material, making it smaller. Secondly, a rotating fan is used to achieve a suction effect, increasing the speed at which the material falls. Third, the fan and the steam extraction port work together to help accelerate the discharge of steam and increase the air pressure inside the ring die, which helps the granulation process to be extruded and discharged, and avoids clogging of the granulation holes on the ring die. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pellet mill in this invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the pellet mill in this invention. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the connection structure of the permanent magnet motor, the granulation mechanism and the lower feeding structure in this invention.

[0023] Figure 4 This is a schematic diagram of the connection structure between the permanent magnet motor and the granulation mechanism in this invention.

[0024] Figure 5 This is a schematic diagram of the internal structure of the permanent magnet motor in this invention.

[0025] Figure 6 This is a schematic diagram of the internal structure of the lower feeding structure in this invention.

[0026] Figure 7 This is a schematic diagram of the feeding mechanism and the upper feeding structure in this invention.

[0027] Figure 8 This is a schematic diagram of the connection structure between the outer shell and the pelletizing structure in this invention.

[0028] Figure 9 This is a schematic diagram of the structure of the vibration buffer assembly in this invention.

[0029] Figure 10 This is a schematic diagram of the connection structure between the crushing and suction structure and the vertical channel in this invention.

[0030] The attached diagram is labeled as follows: 1. Base; 2. Outer shell; 20. Crushing and suction structure; 201. Fan; 202. Column; 203. Bevel gear one; 204. Horizontal bar; 205. Cutting blade; 206. Drive gear shaft; 207. Bevel gear two; 21. Steam extraction port; 22. Pelletizing structure; 221. Telescopic cylinder; 222. Scraper blade; 23. Discharge port; 24. Arc-shaped rod; 25. Positioning block; 3. Stator; 30. Buffer vibration structure; 301. Positioning rod; 302. Pressure plate; 303. Spring; 304. Limiting post; 31. Rotary... 32. Bearing; 33. Hollow shaft; 34. Embedded hole; 4. Protective shell; 5. Drive motor; 6. Transmission belt one; 7. Stirring shaft; 8. Spiral feeding structure; 9. Horizontal channel; 10. Manual feed port; 11. Vertical channel; 12. Power motor; 13. Transmission belt two; 131. Pulley; 14. Conveyor cylinder one; 15. Push shaft; 151. Feeding blade; 16. Conveyor cylinder two; 17. Ring die; 171. Pressure roller; 172. Locking gear; 173. Threaded rod; 174. Support plate; 18. Positioning plate; 19. Material receiving trough plate. Detailed Implementation

[0031] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0032] See Figures 1-8 A low-energy pellet mill includes a base 1, a pelletizing mechanism for extrusion forming, a permanent magnet motor driven by the pelletizing mechanism, a lower feeding mechanism connected to the pelletizing mechanism, and an upper feeding mechanism communicating with the lower feeding mechanism. The pelletizing mechanism and the lower feeding mechanism are closedly connected, and the lower feeding mechanism and the upper feeding mechanism are also closedly connected. The permanent magnet motor is mounted on the base 1. The permanent magnet motor is connected to the buffer vibration assembly, and the lower feeding mechanism is connected to the crushing and suction structure.

[0033] The pelletizing mechanism includes a ring die base, a ring die 17 coaxially fixed on the ring die base, a pressure roller 171 rotatably mounted on a pressure roller base, a pressure roller shaft passing through the center of the pressure roller 171, and a locking and limiting structure connected to the pressure roller shaft. A gap is provided between the inner side of the pressure roller 171 and the inner side of the ring die 17. The inner side of the ring die 17 is provided with a pressure roller base, and the outer side is provided with a housing 2. The bottom end face of the pressure roller seat is coaxially connected to the fixed shaft, which passes through the center of the permanent magnet motor; A bearing 32 is coaxially mounted on one end near the fixed shaft, and a locking structure is connected to the other end of the fixed shaft. A pelletizing structure and an arc rod 24 are also provided on the outer side of the ring die 17. The arc rod 24 is positioned opposite to the pelletizing structure and is connected to the inner side of the outer shell 2 through a positioning block 25.

[0034] The pelletizing structure is an existing technology. For example, multiple cutters can be set around the outer side of the ring die 17, and the multiple cutters can make circumferential circular motions. This will not be described in detail here. The permanent magnet motor includes a stator 3, a rotor 31 disposed inside the stator 3, a hollow shaft 33 passing through the center of the rotor 31, a bearing 32 connected to the hollow shaft 33, and a fixed shaft coaxially passing through the hollow shaft 33. Hollow shaft 33 is coaxially fixed and driven to the ring mold base; The vibration damping assembly includes a pressure plate 302 that contacts the outside of the stator 3, a spring 303 that is fixedly connected to the pressure plate 302 at one end, and a limiting post 304 that passes through the inside of the spring 303. One end of the limiting post 304 is ball-hinged to a positioning rod 301, and the positioning rod 301 is fixedly connected to the upper feeding mechanism.

[0035] When the stator 3 vibrates, the spring 303 helps to buffer the vibration. Multiple springs 303 are located in multiple directions of the stator 3, ensuring that the stator 3 can be constrained in multiple directions, reducing vibration energy; and facilitating the rotor 31 to operate at higher speeds.

[0036] More preferably, a protective shell 4 is provided on the outer side of one end of the stator 3; and an embedding hole 34 is provided in the center of the hollow shaft 33.

[0037] It should be noted that in this scheme, the stator 3 and rotor 31 are existing structures or improvements, and the attached drawings are only for illustration.

[0038] It should be noted that in this scheme, the ring mold seat rotates under the drive of the hollow shaft 33, which in turn drives the ring mold 17 to rotate coaxially, while the fixed shaft and pressure roller seat do not rotate. Under the action of the locking structure, the fixed shaft and pressure roller seat are positioned. The locking structure can be any mechanical structure, as long as the outer end of the fixed shaft is positioned. For example, bolts or gears can be used for limiting. For the sake of simplifying the design, it is not shown in the attached drawings.

[0039] The lower feeding mechanism includes a positioning plate 18, a push shaft 15 passing through the center of the positioning plate 18, multiple feeding blades 151 connected to the outside of the push shaft 15, a first conveyor cylinder 14 coaxially connected to one side of the positioning plate 18 and a second conveyor cylinder 16 coaxially connected to the other side of the positioning plate 18, a housing 2 coaxially connected to the positioning plate 18, and a housing 2 coaxially sleeved on the outside of the second conveyor cylinder 16. The bottom end of the housing 2 is provided with a discharge port 23 and the top end is provided with a steam extraction port 21. The push shaft 15 is connected to a rotary power mechanism. The upper end of the conveyor cylinder 14 is connected to the bottom end of the vertical channel 11, and a manual feed port 10 is provided on the outside of the vertical channel 11.

[0040] The rotary power mechanism includes a power motor 12 and a transmission belt 13, which is connected to a pulley 131 at one end of the drive shaft 15. Similarly, a pulley structure is also designed on the motor shaft of the power motor 12, and the pulley 131 is connected to the pulley structure through the transmission belt 13. Both the pulley 131 and the pulley structure are existing technologies and will not be described in detail here.

[0041] The outer casing 2 is also connected to the stator 3, forming a fixation for the first conveyor cylinder 14 and the second conveyor cylinder 16.

[0042] The upper feeding mechanism includes a horizontal channel 9 connected to the top of the vertical channel 11 at one end, a material receiving trough plate 19 connected to the other end of the horizontal channel 9, a spiral feeding structure 8 passing through the horizontal channel 9 and the material receiving trough plate 19, and a crushing structure set on the material receiving trough plate 19.

[0043] The spiral feeding structure 8 includes a feeding shaft, spiral blades sleeved on the outside of the feeding shaft, and a rotary motor connected to the feeding shaft. The two ends of the feeding shaft are rotatably connected to the two ends of the horizontal channel 9. The specific structure of the spiral feeding structure 8 is prior art and will not be described in detail here.

[0044] The pulverizing structure includes a horizontally arranged stirring shaft 7 and multiple stirring blades arranged outside the stirring shaft 7. One end of the stirring shaft 7 is connected to the drive motor 5 via a transmission belt 6.

[0045] The crushing and suction structure includes a horizontal rod 204 fixed horizontally inside the vertical channel 11, a column 202 vertically rotatably connected to the horizontal rod 204, a cutting blade 205 fixed to the top of the column 202, a fan 201 fixed to the bottom of the column 202, a bevel gear 203 coaxially connected to the column 202, a bevel gear 207 meshing with the bevel gear 203, and a drive gear shaft 206 passing through the center of the bevel gear 207. The drive gear shaft 206 is connected to the push shaft 15 via a power belt.

[0046] The structure of the stirring blade can be any shape, as long as it achieves the effect of stirring and crushing.

[0047] The locking and limiting structure includes a support plate 174, a locking gear 172 coaxially connected to the pressure roller shaft, a protrusion fixed to the outside of the locking gear 172, and two threaded rods 173 with one end abutting against both sides of the protrusion. The other end of the threaded rods 173 passes through the fixing block and is provided with a nut.

[0048] When the locking and limiting structure is in use, the rotation angle of the protrusion is adjusted by turning the two opposing threaded rods 173, thereby adjusting the gap between the pressure roller 171 and the ring die 17. Because the pressure roller shaft is eccentrically connected to the pressure roller, the rotation of the pressure roller shaft can cause a slight change in the actual position of the pressure roller 171. This is existing technology and will not be described in detail here.

[0049] The pelletizing structure includes a telescopic cylinder 221 and a scraper blade 222 fixedly connected to the free end of the telescopic cylinder 221. The scraper blade 222 is positioned near the outer side of the ring die 17. The distance between the scraper blade 222 and the ring die 17 is adjusted by the action of the telescopic cylinder 221.

[0050] The scraper blade 222 is an existing structure, located near the outer side of the ring die 17, and is used to cut the particles discharged from the ring die 17 into granules.

[0051] The specific working process of this invention is as follows: This design incorporates both a lower and upper feeding structure. During operation, the material is placed in the receiving trough 19. Under the action of the crushing structure, large pieces of material are cut into smaller pieces, facilitating transportation and unloading. Under the action of the spiral feeding structure 8, the chopped material is transferred to the horizontal channel 9 and the vertical channel 11, and then enters the first conveyor cylinder 14. Under the action of the push shaft 15 and the feeding blades 151, the material is pushed from the first conveyor cylinder 14 to the second conveyor cylinder 16, and then enters the ring die 17. During the extrusion process between the ring die 17 and the pressure roller 171, the material is shaped and granulated.

[0052] The device includes a housing 2 located outside the ring die 17. When the extruded particles are extruded from the ring die 17, they are cut into granules by the pelletizing structure and flow out through the discharge holes designed on the housing 2.

[0053] The hollow shaft 33 is provided and makes movable contact with the fixed shaft. Since the iron core has no potential mechanical loss, the motor operation is very reliable. Moreover, its size and weight are free from the limitations of the traditional iron core, and there is a lot of room for expansion design. The fluctuation frequency and time of the hollow motor are much smaller than those of the traditional motor. Moreover, the hollow shaft 33 design eliminates the need for a gear reduction mechanism, thus avoiding wear and lubrication consumption. This design incorporates a permanent magnet motor, which eliminates the need for the excitation winding, carbon brushes, and slip rings of a traditional generator, reducing potential failure points and wear parts, thus improving operational reliability compared to conventional motors.

[0054] In this design, a crushing and suction structure is incorporated, with the drive gear shaft 206 rotated by the power motor 12. One method is to use a cutting blade to cut the falling material, making it smaller. Secondly, a rotating fan is used to achieve a suction effect, increasing the speed at which the material falls. Third, the fan and the steam extraction port work together to help accelerate the discharge of steam and increase the air pressure inside the ring die, which helps the granulation process to be extruded and discharged, and avoids clogging of the granulation holes on the ring die.

[0055] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A low-energy pellet mill, characterized in that, It includes a granulation mechanism for extrusion molding, a permanent magnet motor driven by the granulation mechanism, a lower feeding mechanism connected to the granulation mechanism, and an upper feeding mechanism connected to the lower feeding mechanism. The granulation mechanism is closedly connected to the lower feeding mechanism, and the lower feeding mechanism and the upper feeding mechanism are closedly connected. The permanent magnet motor is connected to the buffer vibration assembly, and the lower feeding mechanism is connected to the crushing and suction structure. The pelletizing mechanism includes a ring die seat, a ring die (17) coaxially fixed on the ring die seat, a pressure roller (171) rotatably mounted on a pressure roller seat, a pressure roller shaft passing through the center of the pressure roller (171), and a locking and limiting structure connected to the pressure roller shaft. A gap is provided between the inner sides of the pressure roller (171) and the ring die (17). The bottom end face of the pressure roller seat is coaxially connected to a fixed shaft, and the fixed shaft is located through the center of the permanent magnet motor. The pressure roller seat is provided inside the ring die (17), and a housing (2) is provided outside the ring die (17). A bearing (32) is coaxially provided at one end near the fixed shaft, and a locking structure is connected to the other end of the fixed shaft. A pelletizing structure and an arc rod (24) are also provided on the outside of the ring mold (17). The arc rod (24) is arranged opposite to the pelletizing structure and is connected to the inside of the outer shell (2) through a positioning block (25). The permanent magnet motor includes a stator (3), a rotor (31) disposed inside the stator (3), and a hollow shaft (33) passing through the center of the rotor (31). The bearing (32) is connected to the hollow shaft (33), and the fixed shaft passes through the hollow shaft (33) coaxially. The hollow shaft (33) is coaxially fixedly driven connected to the ring mold seat. The vibration damping assembly includes a pressure plate (302) that is in contact with the outside of the stator (3), a spring (303) that is fixedly connected to the pressure plate (302) at one end, and a limiting post (304) that passes through the inside of the spring (303). One end of the limiting post (304) is ball-hinged to a positioning rod (301), and the positioning rod (301) is fixedly connected to the upper feeding mechanism.

2. The low-energy pellet mill according to claim 1, characterized in that, The lower feeding mechanism includes a positioning plate (18), a push shaft (15) passing through the center of the positioning plate (18), multiple feeding blades (151) connected to the outside of the push shaft (15), a first conveyor cylinder (14) coaxially connected to one side of the positioning plate (18) and a second conveyor cylinder (16) coaxially connected to the other side of the positioning plate (18). The outer shell (2) is coaxially connected to the positioning plate (18). The outer shell (2) is coaxially sleeved on the outside of the second conveyor cylinder (16). The bottom end of the outer shell (2) is provided with a discharge port (23) and the upper end is provided with a steam extraction port (21). The push shaft (15) is connected to a rotary power mechanism. The upper end face of the conveyor cylinder (14) is connected to the bottom end of the vertical channel (11), and a manual feed port (10) is provided on the outside of the vertical channel (11).

3. The low-energy pellet mill according to claim 2, characterized in that, The upper feeding mechanism includes a horizontal channel (9) with one end connected to the top of the vertical channel (11), a material receiving trough (19) connected to the other end of the horizontal channel (9), a spiral feeding structure (8) passing through the horizontal channel (9) and the material receiving trough (19), and a crushing structure set on the material receiving trough (19).

4. A low-energy pellet mill according to claim 3, characterized in that, The spiral feeding structure (8) includes a feeding shaft, a spiral blade sleeved on the outside of the feeding shaft, and a rotary motor connected to the feeding shaft.

5. A low-energy pellet mill according to claim 3, characterized in that, The pulverizing structure includes a horizontally arranged stirring shaft (7) and a plurality of stirring blades arranged outside the stirring shaft (7). One end of the stirring shaft (7) is connected to the drive motor (5) via a transmission belt (6).

6. A low-energy pellet mill according to claim 2, characterized in that, The crushing and suction structure includes a horizontal rod (204) fixed inside the vertical channel (11), a column (202) rotatably connected to the horizontal rod (204), a cutting blade (205) fixed to the top of the column (202), a fan (201) fixed to the bottom of the column (202), a bevel gear one (203) coaxially connected to the column (202), a bevel gear two (207) meshing with the bevel gear one (203), and a drive gear shaft (206) passing through the center of the bevel gear two (207). The drive gear shaft (206) is connected to the push shaft (15) via a power belt.

7. A low-energy pellet mill according to claim 1, characterized in that, The locking and limiting structure includes a locking gear (172) coaxially connected to the pressure roller shaft, a protrusion fixed to the outside of the locking gear (172), and two threaded rods (173) with one end abutting against both sides of the protrusion. The other end of the threaded rod (173) passes through the fixing block and is provided with a nut. When the locking and limiting structure is in use, the rotation angle of the protrusion is adjusted by turning the two opposing threaded rods (173), thereby adjusting the gap between the pressure roller (171) and the ring die (17), and the pressure roller shaft is eccentrically connected to the pressure roller.

8. A low-energy pellet mill according to claim 1, characterized in that, The pelletizing structure includes a telescopic cylinder (221) and a scraper blade (222) fixedly connected to the free end of the telescopic cylinder (221). The scraper blade (222) is disposed near the outer side of the ring die (17).

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