Biomass particle granulator

Abstract

The invention discloses a biomass particle granulator which comprises a granulator body, a cutting unit, a screening unit and a discharging unit, the granulator body comprises a mounting disc and an annular mold, and the cutting unit comprises an annular double-edged knife in attached contact with the outer wall of the annular mold, a top cover and a first driving mechanism; the screening unit comprises a first annular piece, a second annular piece assembled on the mounting disc through a plurality of mounting arms and an annular filter plate capable of vertically sliding in a reciprocating manner, the inner edge of the annular filter plate is inclined upwards, and a first tubular part is arranged on the inner edge of the annular filter plate in a protruding manner; a second tubular part which is in attached sliding contact with the second annular piece and is higher than the top of the second annular piece is arranged on the outer edge of the annular filter plate in a protruding mode, and the annular double-edged cutter can cut extruded biomass long strips when moving upwards once or moving downwards to one side, so that the cut biomass particles are uniform in length, and the quality of the biomass particles is improved. And moreover, generated powder and crushed aggregates are few, and local biomass particles cannot become loose.

Description

Technical Field

[0001] The present invention relates to the technical field related to biomass pellet manufacturing, and in particular to a biomass pellet making machine. Background Art

[0002] Biomass pellets are cold-formed and compacted by rollers and ring dies at room temperature using crushed biomass straw, forestry waste and other raw materials. The density of the raw materials is generally 0.1-0.13t / m3, and the density of the formed pellets is 1.1-1.3t / m3, which is convenient for storage and transportation, and greatly improves the combustion performance of biomass.

[0003] Biomass pellets can be used for civil heating and daily energy. They are clean, pollution-free, easy to store and transport. They can be used as fuel for industrial boilers and kilns, replacing coal and gas to solve environmental pollution. They can be used as fuel for gasification power generation and thermal power generation to solve the problem of shutting down small thermal power plants.

[0004] The biomass pelletizer in the prior art uses an extrusion roller to extrude a straw mixture from an annular mold. The extruded shape is a long strip. Usually, a scraper that moves along the circumference of the annular mold is arranged on the outside of the annular mold. The scraper will scrape the biomass strips while scraping off the biomass particles. The scraper will push the biomass strips to bend and break, which will make the biomass particles of different lengths, and the biomass will become loose and easy to disperse at the bending part. It is also easy to produce fragments and powder when bending and breaking. Therefore, it is necessary to design a biomass pelletizer. Summary of the invention

[0005] In view of the above technical problems, the purpose of the present invention is to overcome the problem in the prior art that the biomass strips are bent and broken by the scraper, and the biomass particles are not only of different lengths but also become loose and easy to disperse at the bends.

[0006] In order to achieve the above-mentioned object, the present invention provides a biomass pellet granulator, comprising: a pelletizer body, a cutting unit, a screening unit and a discharging unit for discharging biomass pellets, wherein the pelletizer body comprises a mounting plate and an annular mold assembled on the mounting plate through an annular mounting frame;

[0007] The cutting unit includes an annular double-edged knife that is in close contact with the outer wall of the annular mold, a top cover that is in close contact and fixedly connected to the top of the annular mold, and a first driving mechanism mounted on the top cover for vertical movement of the annular double-edged knife with a wire, the screening unit includes a first annular member that is in close contact and fixedly connected to the lower end of the annular mold, a second annular member that is mounted on the mounting plate through a plurality of mounting arms and is spaced apart on the outside of the first annular member, and an annular filter plate that can slide vertically reciprocatingly and whose inner edge is inclined upward, the inner edge of the annular filter plate protrudingly provides a first tubular portion that is in close contact and sliding contact with the first annular member and is lower than the top of the first annular member, and the outer edge of the annular filter plate protrudingly provides a second tubular portion that is in close contact and sliding contact with the second annular member and is higher than the top of the second annular member.

[0008] Preferably, the screening unit further comprises a plurality of ring-shaped slag collecting boxes with open tops and located below the ring-shaped filter plate, and a binding rope used to be tied to the outer walls of the plurality of slag collecting boxes so that the plurality of slag collecting boxes are sequentially attached to form a ring;

[0009] The first annular member is provided with a third tubular portion which is fitted with the first tubular portion and whose lower end is located below the first tubular portion; the second annular member is provided with a fourth tubular portion which is fitted with the second tubular portion and whose lower end is located below the second tubular portion; the arc-shaped outer wall of the slag collecting box close to the annular mold can fit in contact with the third tubular portion; the arc-shaped side wall of the slag collecting box away from the annular mold is provided with an arc-shaped sealing portion which protrudes upward and can fit in contact with the fourth tubular portion.

[0010] Preferably, the discharging unit includes an annular outer shell whose upper end is fixedly connected to the top cover and whose lower end is fixedly connected to the outer edge of the second annular member, a first ring tooth slidably connected to the upper part of the inner wall of the outer shell along the circumferential direction of the second annular member, a scraper fixedly connected to the first ring tooth and whose lower surface contacts the top of the second annular member, a first motor assembled on the top of the top cover through a first mounting frame and whose output shaft passes downward through the top cover, and a first gear sleeved on the output shaft of the first motor and meshing with the first ring tooth, and a discharging port is provided on the outer shell.

[0011] Preferably, the first driving mechanism includes a plurality of sliding arms which are spaced apart along the circumferential direction of the annular mold and which vertically slide through the top cover, a first sliding ring fixedly connected to the tops of the plurality of sliding arms, a plurality of vertical threaded rods which are spaced apart along the circumferential direction of the first sliding ring and whose lower ends are axially connected to the top cover, a fixing ring axially connected to the upper ends of the plurality of threaded rods, a second ring tooth which is coaxially arranged with the fixing ring and slidably connected to the top cover, a second motor which is mounted on the top cover through a second mounting frame, and a second gear which is sleeved on the output shaft of the second motor, each threaded rod is threadedly sleeved with a threaded sleeve which is fixedly connected to the first sliding ring, a third gear which is meshed with the second ring tooth is sleeved on the threaded rod, the second gear is meshed with one of the third gears, and the lower end of the sliding arm is connected to the annular double-edged knife through a connecting arm.

[0012] Preferably, the screening unit also includes an annular slide coaxially fixedly installed at the bottom of the second annular member, a plurality of sliders slidably assembled on the annular slide, a connecting frame connected to the plurality of sliders in a one-to-one correspondence, a guide ring fixedly connected to the plurality of connecting frames and coaxially arranged with the annular slide, a second sliding ring coaxially arranged with the guide ring and vertically slidably connected to the lower surface of the second annular member, a second driving mechanism for driving the guide ring to rotate, at least one pulley assembled on the second sliding ring and in sliding contact with the upper surface of the guide ring, at least one group of transmission mechanisms assembled on the fourth tubular portion and driving the annular filter plate to slide vertically when the second sliding ring slides vertically, and a plurality of groups of elastic pressing mechanisms assembled on the second annular member for pushing the second sliding ring to slide vertically downward, and at least one inclined wedge portion protruding from the upper surface of the guide ring.

[0013] Preferably, the second driving mechanism comprises a third ring tooth fixed coaxially with the guide ring, a third motor mounted on the mounting plate, and a fourth gear fixedly sleeved on the output shaft of the third motor and meshing with the third ring tooth.

[0014] Preferably, the transmission mechanism comprises a connecting rod whose middle portion is hinged to the fourth tubular portion through a horizontal hinge shaft located below the second tubular portion, a first connecting seat mounted on the second sliding ring, and a second connecting seat mounted on the annular filter plate;

[0015] Both ends of the connecting rod are provided with strip slide grooves in the same length direction, the first connecting seat is connected to a first connecting bolt that slides through the corresponding strip slide groove, and the second connecting seat is connected to a second connecting bolt that slides through the corresponding strip through groove.

[0016] Preferably, the elastic pressing mechanism includes a vertical guide rod fixedly connected to the second annular member, a sliding sleeve sleeved on the guide rod and fixedly connected to the second sliding ring, and a spring sleeved on the guide rod with its two ends respectively in contact with the second sliding ring and the second annular member.

[0017] Preferably, the fourth tubular portion is provided with a mounting groove for the corresponding connecting rod to pass through, the fourth tubular portion is provided with a mounting seat hinged to the hinge shaft and covering the mounting groove, the connecting rod is provided with a hinge portion coaxially arranged with the hinge shaft, and the mounting seat is provided with an arc-shaped groove that is in close contact with the hinge portion.

[0018] Preferably, the cutting unit further comprises an annular stabilizing frame which is coaxially arranged with the annular mold and fixedly connected with the plurality of connecting arms.

[0019] According to the above technical solution, the present invention provides a biomass pellet granulator, which has the following beneficial technical effects compared with the prior art:

[0020] First, the annular double-edged knife can cut the extruded biomass strips by moving upward once or downward to one side, so that the cut biomass particles are uniform in length, less powder and debris are generated, and the biomass particles will not become loose locally;

[0021] Secondly, the biomass particles will fall down onto the annular filter plate to filter the broken materials and powders, because the inner edge of the annular filter plate is inclined upward, which can make the biomass particles move toward the second annular member;

[0022] Thirdly, the reciprocating vertical sliding of the annular filter plate is not only conducive to filtering out the broken materials and powder therein, but also conducive to moving the biomass particles toward the second annular member, and the discharging unit will discharge the biomass particles on the second annular member.

[0023] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation mode; and the parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a three-dimensional structural schematic diagram of a biomass pelletizing machine provided by the present invention;

[0026] Figure 2 This is a partial three-dimensional structure diagram of a biomass pelletizer provided by the present invention. Figure 1 ;

[0027] Figure 3 The invention provides a biomass pellet granulator. Figure 2 A partial cross-sectional view of

[0028] Figure 4 This is a partial three-dimensional structure diagram of a biomass pelletizer provided by the present invention. Figure 2 ;

[0029] Figure 5 The invention provides a biomass pellet granulator. Figure 3 The enlarged schematic diagram of point A in the middle;

[0030] Figure 6 It is a three-dimensional structural schematic diagram of a binding rope and a slag collecting box of a biomass pellet granulator provided by the present invention;

[0031] Figure 7It is a three-dimensional structural schematic diagram of a cutting unit of a biomass pelletizing machine provided by the present invention;

[0032] Figure 8 It is a three-dimensional structural schematic diagram of a screening unit of a biomass pelletizing machine provided by the present invention;

[0033] Fig. 9 It is a cross-sectional view of a screening unit of a biomass pelletizing machine provided by the present invention;

[0034] Fig.10 The present invention provides a partial three-dimensional structure diagram of a screening unit of a biomass pelletizer. Figure 1 ;

[0035] Fig.11 The present invention provides a partial three-dimensional structure diagram of a screening unit of a biomass pelletizer. Figure 2 ;

[0036] Fig.12 The present invention provides a partial three-dimensional structure diagram of a screening unit of a biomass pelletizer. Figure 3 .

[0037] Description of Reference Numerals

[0038] 1. Granulator body; 2. Mounting plate; 3. Ring mounting frame; 4. Ring mold; 5. Ring double-edged knife; 6. Top cover; 7. First ring member; 8. Mounting arm; 9. Second ring member; 10. Ring filter plate; 11. First tubular portion; 12. Second tubular portion; 13. Slag collecting box; 14. Binding rope; 15. Third tubular portion; 16. Fourth tubular portion; 17. Arc sealing portion; 18. Casing; 19. First ring tooth; 20. Scraper; 21. First motor ; 22. Sliding arm; 23. First sliding ring; 24. Threaded rod; 25. Fixed ring; 26. Second ring gear; 27. Second motor; 28. Third gear; 29. ​​Connecting arm; 30. Connecting frame; 31. Guide ring; 32. Second sliding ring; 33. Pulley; 34. Third ring gear; 35. Third motor; 36. Connecting rod; 37. First connecting seat; 38. Second connecting seat; 39. Guide rod; 40. Spring; 41. Mounting seat; 42. Articulated part. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0040] In the present invention, unless otherwise stated, directional words such as "upper, lower, inside, outside" contained in a term merely represent the orientation of the term in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0041] like Figure 1-12 As shown, a biomass pellet granulator comprises: a pelletizer body 1, a cutting unit, a screening unit and a discharging unit for discharging biomass pellets, wherein the pelletizer body 1 comprises a mounting plate 2 and an annular die 4 assembled on the mounting plate 2 through an annular mounting frame 3;

[0042] The cutting unit includes an annular double-edged knife 5 that is in contact with the outer wall of the annular mold 4, a top cover 6 that is in contact with the top of the annular mold 4, and a first driving mechanism mounted on the top cover 6 for vertically moving the annular double-edged knife 5 with a wire, and the screening unit includes a first annular member 7 that is in contact with the lower end of the annular mold 4, a second annular member 9 that is mounted on the mounting plate 2 through a plurality of mounting arms 8 and is spaced apart on the outside of the first annular member 7, and an annular filter plate 10 that can slide vertically reciprocatingly and whose inner edge is inclined upward, the inner edge of the annular filter plate 10 is protrudingly provided with a first tubular portion 11 that is in contact with the first annular member 7 and is lower than the top of the first annular member, and the outer edge of the annular filter plate 10 is protrudingly provided with a second tubular portion 12 that is in contact with the second annular member 9 and is higher than the top of the second annular member 9.

[0043] In the above technical solution, the granulator body 1 is an existing mature technology. The granulator body 1 will extrude the straw mixture from the annular mold 4 into long strips. The cutting unit is started to drive the annular double-edged knife 5 to move vertically in contact with the outer surface of the annular mold 4. The annular double-edged knife moves upward once or moves downward to one side, which can cut the extruded biomass strips, so that the cut biomass particles are of uniform length.

[0044] The biomass particles will fall downward onto the annular filter plate 10 . Since the inner edge of the annular filter plate 10 is tilted upward, the biomass particles can move toward the second annular member 9 . Even if some of the biomass particles fall onto the first annular member 7 , the vibration generated by the startup of the equipment will cause the biomass particles to move toward the annular filter plate 10 .

[0045] The reciprocating vertical sliding of the annular filter plate 10 is not only conducive to filtering out the broken materials and powder therein, but also conducive to moving the biomass particles toward the second annular member 9 , and the discharging unit will discharge the biomass particles on the second annular member 9 .

[0046] In a preferred embodiment of the invention, the screening unit further comprises a plurality of slag collecting boxes 13 which are ring-shaped and open at the top and are located below the ring-shaped filter plate 10, and a binding rope 14 which is used to be tied to the outer walls of the plurality of slag collecting boxes 13 so that the plurality of slag collecting boxes 13 are sequentially attached to form a ring;

[0047] The first annular member 7 is provided with a third tubular portion 15 which is fitted with the first tubular portion 11 and whose lower end is located below the first tubular portion 11; the second annular member 9 is provided with a fourth tubular portion 16 which is fitted with the second tubular portion 12 and whose lower end is located below the second tubular portion 12; the arcuate outer wall of the slag collecting box 13 close to the annular mold 4 can fit in contact with the third tubular portion 15; the arcuate side wall of the slag collecting box 13 away from the annular mold 4 is provided with an arcuate sealing portion 17 which protrudes upward and can fit in contact with the fourth tubular portion 16.

[0048] In the above technical solution, the broken materials and powder dropped from the annular filter plate 10 will fall downward into a plurality of slag collecting boxes 13. Some water can be poured into the slag collecting boxes 13 to prevent the fallen broken materials and powder from being raised again.

[0049] When it is necessary to clean the slag collecting box 13, the binding rope 14 is loosened, and the slag collecting box 13 can be taken out for cleaning. Because the second annular member 9 is assembled on the mounting plate 2 by a plurality of mounting arms 8, the slag collecting box 13 can be assembled and disassembled through the space between the second annular member 9 and the mounting plate 2; after the slag collecting box 13 is cleaned, the plurality of slag collecting boxes 13 are put back into place to form a ring, and the binding belt is used to bind the plurality of slag collecting boxes 13, so that the plurality of slag collecting boxes 13 fit tightly together, and the arc-shaped outer side wall of the slag collecting box 13 close to the annular mold 4 can fit in contact with the third tubular portion 15, and the arc-shaped sealing portion 17 is in contact with the second tubular portion 12, which can prevent the leakage of broken materials and powder.

[0050] In a preferred embodiment of the invention, the discharging unit includes an annular outer shell 18 whose upper end is fixedly connected to the top cover 6 and whose lower end is fixedly connected to the outer edge of the second annular member 9, a first ring tooth 19 which is slidably connected to the upper part of the inner wall of the outer shell 18 along the circumferential direction of the second annular member 9, a scraper 20 which is fixedly connected to the first ring tooth 19 and whose lower surface contacts the top of the second annular member 9, a first motor 21 which is assembled on the top of the top cover 6 through a first mounting frame and whose output shaft passes downward through the top cover 6, and a first gear which is sleeved on the output shaft of the first motor 21 and meshes with the first ring tooth 19, and a discharging port is provided on the outer shell 18.

[0051] In the above technical solution, the first motor 21 drives the first ring gear 19 to rotate through the first gear, and the first ring gear 19 drives the scraper 20 to make a circular motion on the second ring member 9, scraping the biomass particles falling on the second ring member 9 toward the discharge port.

[0052] In a preferred embodiment of the invention, the first driving mechanism includes a plurality of sliding arms 22 which are spaced apart along the circumferential direction of the annular mold 4 and which vertically slide through the top cover 6, a first sliding ring 23 which is fixedly connected to the top of the plurality of sliding arms 22, a plurality of vertical threaded rods 24 which are spaced apart along the circumferential direction of the first sliding ring 23 and whose lower ends are axially connected to the top cover 6, a fixing ring 25 which is axially connected to the upper ends of the plurality of threaded rods 24, a second ring tooth 26 which is coaxially arranged with the fixing ring 25 and slidably connected to the top cover 6, a second motor 27 which is mounted on the top cover 6 through a second mounting frame, and a second gear which is sleeved on the output shaft of the second motor 27, each threaded rod 24 is threadedly sleeved with a threaded sleeve which is fixedly connected to the first sliding ring 23, a third gear 28 which is meshed with the second ring tooth 26 is sleeved on the threaded rod 24, the second gear is meshed with one of the third gears 28, and the lower end of the sliding arm 22 is connected to the annular double-edged knife 5 through a connecting arm 29.

[0053] In the above technical solution, the second motor 27 is started, and one of the third gears 28 is driven to rotate through the second gear, and then the second ring gear 26 is driven to rotate. The second ring gear 26 will drive the corresponding threaded rod 24 to rotate through several third gears 28. The threaded rod 24 will drive the first sliding ring 23 to move vertically through the threaded sleeve. The first sliding ring 23 will drive several sliding arms 22 to move vertically. The sliding arm 22 drives the annular double-edged knife 5 to move vertically through the connecting arm 29, thereby cutting the biomass strips.

[0054] In a preferred embodiment of the invention, the screening unit also includes an annular slide coaxially fixedly installed at the bottom of the second annular member 9, a plurality of sliders slidably assembled on the annular slide, a connecting frame 30 connected to the plurality of sliders in a one-to-one correspondence, a guide ring 31 fixedly connected to the plurality of connecting frames 30 and coaxially arranged with the annular slide, a second sliding ring 32 coaxially arranged with the guide ring 31 and vertically slidably connected to the lower surface of the second annular member 9, a second driving mechanism for driving the guide ring 31 to rotate, at least one pulley 33 assembled on the second sliding ring 32 and in sliding contact with the upper surface of the guide ring 31, at least one group of transmission mechanisms assembled on the fourth tubular portion 16 and driving the annular filter plate 10 to slide vertically when the second sliding ring 32 slides vertically, and a plurality of groups of elastic pressing mechanisms assembled on the second annular member 9 for pushing the second sliding ring 32 to slide vertically downward, and at least one inclined wedge portion protruding from the upper surface of the guide ring 31.

[0055] In the above technical solution, the second driving mechanism drives the guide ring 31 to rotate, and the guide ring 31 drives the slider to slide on the annular slide seat through the connecting frame 30. Because an inclined wedge portion is provided on the top of the guide ring 31, when the guide ring 31 rotates, the second sliding ring 32 can be pushed upward through the pulley 33. When the pulley 33 passes over the inclined wedge portion, the elastic downward pressing mechanism pushes the second sliding ring 32 to slide downward. The vertical reciprocating motion of the second sliding ring 32 drives the annular filter plate 10 to move reciprocatingly vertically through the transmission mechanism.

[0056] In a preferred embodiment of the invention, the second driving mechanism includes a third ring tooth 34 fixed coaxially with the guide ring 31, a third motor 35 assembled on the mounting plate 2, and a fourth gear fixedly mounted on the output shaft of the third motor 35 and meshing with the third ring tooth 34.

[0057] In the above technical solution, the third motor 35 drives the third ring gear 34 to rotate through the fourth gear, and the third ring gear 34 drives the guide ring 31 to rotate.

[0058] In a preferred embodiment of the invention, the transmission mechanism comprises a connecting rod 36 whose middle part is hinged to the fourth tubular portion 16 through a horizontal hinge shaft located below the second tubular portion 12, a first connecting seat 37 mounted on the second sliding ring 32, and a second connecting seat 38 mounted on the annular filter plate 10;

[0059] Both ends of the connecting rod 36 are provided with strip sliding grooves in the same length direction, the first connecting seat 37 is connected to a first connecting bolt that slides through the corresponding strip sliding groove, and the second connecting seat 38 is connected to a second connecting bolt that slides through the corresponding strip through groove.

[0060] In the above technical solution, when the second sliding ring 32 slides upward, it will drive the first connecting bolt to move upward through the first connecting seat 37, and drive the end of the connecting rod 36 connected to the first connecting bolt to move upward, and the other end of the connecting rod 36 will drive the annular filter plate 10 to slide downward through the second connecting bolt and the second connecting seat 38; when the second sliding ring 32 slides downward, the end of the connecting rod 36 connected to the second connecting bolt will move upward, thereby driving the annular filter plate 10 to slide upward.

[0061] In a preferred embodiment of the invention, the elastic downward pressing mechanism includes a vertical guide rod 39 fixedly connected to the second annular member 9, a sliding sleeve sleeved on the guide rod 39 and fixedly connected to the second sliding ring 32, and a spring 40 sleeved on the guide rod 39 and with both ends respectively in contact with the second sliding ring 32 and the second annular member 9.

[0062] In the above technical solution, the second sliding ring 32 will slide vertically on the guide rod 39, and when the inclined wedge portion slides over the pulley 33, the spring 40 will push the second sliding ring 32 to slide downward.

[0063] In a preferred embodiment of the invention, the fourth tubular portion 16 is provided with a mounting groove for the corresponding connecting rod 36 to pass through, the fourth tubular portion 16 is provided with a mounting seat 41 hinged to the hinge shaft and covering the mounting groove, the connecting rod 36 is provided with a hinge portion 42 coaxially arranged with the hinge shaft, and the mounting seat 41 is provided with an arc-shaped groove that fits in contact with the hinge portion 42.

[0064] In the above technical solution, when the connecting rod 36 rotates, the hinged portion 42 will rotate in accordance with the arc-shaped groove, so as to prevent the broken materials, powders, etc. from leaking through the installation groove.

[0065] In a preferred embodiment of the invention, the cutting unit further comprises an annular stabilizing frame which is coaxially arranged with the annular mold 4 and fixedly connected with a plurality of connecting arms 29 .

[0066] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0068] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A biomass pellet granulator, characterized in that: include: A pelletizer body (1), a cutting unit, a screening unit and a discharging unit for discharging biomass pellets, wherein the pelletizer body (1) comprises a mounting plate (2) and an annular die (4) mounted on the mounting plate (2) via an annular mounting frame (3); The cutting unit comprises an annular double-edged knife (5) in close contact with the outer wall of the annular mold (4), a top cover (6) in close contact and fixed connection with the top of the annular mold (4), and a first driving mechanism mounted on the top cover (6) for vertically moving the annular double-edged knife (5) with a wire; the screening unit comprises a first annular member (7) in close contact and fixed connection with the lower end of the annular mold (4), a second annular member (9) mounted on the mounting plate (2) through a plurality of mounting arms (8) and sleeved on the outer side of the first annular member (7) at intervals, and an annular filter plate (10) capable of reciprocating vertical sliding and with an inner edge inclined upward, the inner edge of the annular filter plate (10) protrudingly provided with a first tubular portion (11) in close contact and sliding contact with the first annular member (7) and lower than the top of the first annular member, and the outer edge of the annular filter plate (10) protrudingly provided with a second tubular portion (12) in close contact and sliding contact with the second annular member (9) and higher than the top of the second annular member (9).

2. A biomass pellet granulator according to claim 1, characterized in that: The screening unit further comprises a plurality of annular slag collecting boxes (13) with open tops and located below the annular filter plate (10), and a binding rope (14) used to be tied to the outer walls of the plurality of slag collecting boxes (13) so that the plurality of slag collecting boxes (13) are sequentially attached to form an annular shape; The first annular member (7) is provided with a third tubular portion (15) which is fitted with the first tubular portion (11) and whose lower end is located below the first tubular portion (11); the second annular member (9) is provided with a fourth tubular portion (16) which is fitted with the second tubular portion (12) and whose lower end is located below the second tubular portion (12); the arc-shaped outer wall of the slag collecting box (13) close to the annular mold (4) can fit in contact with the third tubular portion (15); and the arc-shaped sealing portion (17) which is protruding upwards and can fit in contact with the fourth tubular portion (16) is provided on the arc-shaped side wall of the slag collecting box (13) away from the annular mold (4).

3. A biomass pellet granulator according to claim 1, characterized in that: The discharging unit comprises an annular outer shell (18) whose upper end is fixedly connected to the top cover (6) and whose lower end is fixedly connected to the outer edge of the second annular member (9), a first ring tooth (19) slidably connected to the upper part of the inner wall of the outer shell (18) along the circumferential direction of the second annular member (9), a scraper (20) fixedly connected to the first ring tooth (19) and whose lower surface contacts the top of the second annular member (9), a first motor (21) mounted on the top of the top cover (6) through a first mounting frame and whose output shaft passes downward through the top cover (6), and a first gear sleeved on the output shaft of the first motor (21) and meshing with the first ring tooth (19), and a discharging port is provided on the outer shell (18).

4. A biomass pellet granulator according to claim 1, characterized in that: The first driving mechanism comprises a plurality of sliding arms (22) which are spaced apart along the circumferential direction of the annular mold (4) and which vertically slide through the top cover (6), a first sliding ring (23) which is fixedly connected to the top of the plurality of sliding arms (22), a plurality of vertical threaded rods (24) which are spaced apart along the circumferential direction of the first sliding ring (23) and whose lower ends are axially connected to the top cover (6), a fixing ring (25) which is axially connected to the upper ends of the plurality of threaded rods (24), and a second ring gear which is coaxially arranged with the fixing ring (25) and which is slidably connected to the top cover (6). (26), a second motor (27) mounted on the top cover (6) through a second mounting frame and a second gear sleeved on the output shaft of the second motor (27), each threaded rod (24) is threadedly sleeved with a threaded sleeve fixedly connected to the first sliding ring (23), the threaded rod (24) is sleeved with a third gear (28) meshing with the second ring gear (26), the second gear is meshed with one of the third gears (28), and the lower end of the sliding arm (22) is connected to the annular double-edged knife (5) through a connecting arm (29).

5. The biomass pellet granulator according to claim 2, characterized in that: The screening unit further comprises an annular slide fixedly mounted coaxially on the bottom of the second annular member (9), a plurality of sliders slidably mounted on the annular slide, a connecting frame (30) connected to the plurality of sliders in a one-to-one correspondence, a guide ring (31) fixedly connected to the plurality of connecting frames (30) and coaxially arranged with the annular slide, a second sliding ring (32) coaxially arranged with the guide ring (31) and vertically slidably connected to the lower surface of the second annular member (9), a second driving mechanism for driving the guide ring (31) to rotate, at least one pulley (33) mounted on the second sliding ring (32) and in sliding contact with the upper surface of the guide ring (31), at least one transmission mechanism mounted on the fourth tubular portion (16) and driving the annular filter plate (10) to slide vertically when the second sliding ring (32) slides vertically, and a plurality of elastic pressing mechanisms mounted on the second annular member (9) for pushing the second sliding ring (32) to slide vertically downward, wherein the upper surface of the guide ring (31) is protrudingly provided with at least one inclined wedge portion.

6. A biomass pelletizing machine according to claim 5, characterized in that: The second driving mechanism comprises a third ring tooth (34) fixed coaxially with the guide ring (31), a third motor (35) mounted on the mounting plate (2), and a fourth gear fixedly sleeved on the output shaft of the third motor (35) and meshing with the third ring tooth (34).

7. The biomass pellet granulator according to claim 5, characterized in that: The transmission mechanism comprises a connecting rod (36) whose middle part is hinged to the fourth tubular part (16) through a horizontal hinge shaft located below the second tubular part (12), a first connecting seat (37) mounted on the second sliding ring (32), and a second connecting seat (38) mounted on the annular filter plate (10); Both ends of the connecting rod (36) are provided with strip-shaped sliding grooves in the same length direction; the first connecting seat (37) is connected to a first connecting bolt that slides through the corresponding strip-shaped sliding groove; the second connecting seat (38) is connected to a second connecting bolt that slides through the corresponding strip-shaped through groove.

8. The biomass pelletizing machine according to claim 5, characterized in that: The elastic downward pressing mechanism comprises a vertical guide rod (39) fixedly connected to the second annular member (9), a sliding sleeve sleeved on the guide rod (39) and fixedly connected to the second sliding ring (32), and a spring (40) sleeved on the guide rod (39) and with two ends respectively in contact with the second sliding ring (32) and the second annular member (9).

9. The biomass pellet granulator according to claim 7, characterized in that: The fourth tubular portion (16) is provided with a mounting groove for the corresponding connecting rod (36) to pass through, the fourth tubular portion (16) is provided with a mounting seat (41) hinged to the hinge shaft and covering the mounting groove, the connecting rod (36) is provided with a hinge portion (42) coaxially arranged with the hinge shaft, and the mounting seat (41) is provided with an arc-shaped groove in close contact with the hinge portion (42).

10. The biomass pellet granulator according to claim 4, characterized in that: The cutting unit also includes an annular stabilizing frame which is coaxially arranged with the annular mold (4) and fixedly connected to a plurality of connecting arms (29).

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