Biomass fuel granulator

Abstract

The invention relates to the technical field of fuel particle machines, in particular to a biomass fuel particle machine which comprises a shell, a first extrusion ring and a second extrusion ring. A first extrusion ring is connected in the shell; a plurality of first extrusion holes are formed in the first extrusion ring; the first extrusion ring is attached to the extrusion wheel; a second extrusion ring is connected in the shell; the second extrusion ring is larger than the first extrusion ring in diameter; a plurality of second extrusion holes are formed in the second extrusion ring; and each second extrusion hole corresponds to the position of the adjacent first extrusion hole. The hot air blown out by the hot air blower is blown to the connecting cylinder, so that the connecting cylinder is heated by the hot air, then heat is transferred to the remaining material bars in the connecting cylinder, the temperature of the material bars is increased, preheating of the material bars in the connecting cylinder is achieved, cohesion of the material bars is improved, and the situation that the material bars are broken during cutting is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of fuel pellet machines, and in particular to a biomass fuel pellet machine. Background Art

[0002] The biomass pellet machine is a device that uses agricultural and forestry waste such as wood chips, straw, rice husks, bark and other biomass as raw materials, solidifies them into high-density pellet fuel through pretreatment and processing.

[0003] In the process of processing biomass raw materials into biomass powder and extruding it into material rods through a biomass pellet machine, since the water content of the biomass powder in the biomass pellet machine is bound to be different, the existing biomass pellet machine cannot fully soften the raw materials during the short-term extrusion and heating process, nor can it make the biomass powder with high water content sufficiently dry, which affects the adhesion and causes insufficient cohesion inside the pressed material rods, making the material rods easy to break when cut by a cutter, resulting in the quality of the cut material rods not meeting the standards. Summary of the invention

[0004] In order to overcome the disadvantage that the water content of some biomass powders in the biomass pellet machine is different, and too much or too little water content will lead to insufficient cohesion inside the pressed material rod, making the material rod easy to break when cut by the cutter, thereby making the cut material rod substandard in quality, the present invention provides a biomass fuel pellet machine.

[0005] The technical solution is: a biomass fuel pellet machine, including a shell, a power assembly, an extrusion wheel, a first extrusion ring and a second extrusion ring; the shell is connected to the power assembly; the power assembly is connected to a plurality of extrusion wheels; the extrusion wheels are driven to rotate by the power assembly; the shell is connected to the first extrusion ring; the first extrusion ring is provided with a plurality of first extrusion holes; the first extrusion ring is fitted with the extrusion wheel; the shell is connected to the second extrusion ring; the diameter of the second extrusion ring is larger than that of the first extrusion ring; the second extrusion ring is provided with a plurality of second extrusion holes; each second extrusion hole corresponds to the position of an adjacent first extrusion hole; and It includes a cutting component, a connecting tube, a hot air blower, a cold air component and a cleaning system; a cutting component for cutting off a material rod is connected inside the shell; a plurality of connecting tubes are connected between the first extrusion ring and the second extrusion ring; each connecting tube is located between two adjacent first extrusion holes and the second extrusion holes; a through hole is opened on the inner side of each connecting tube; a plurality of vents are opened on the shell, and the vents run through the front and rear sides of the shell; a plurality of hot air blowers are connected to the shell; a cold air component for cooling the cut material rod is connected to the shell; a cleaning system for cleaning agglomerated material residues in the connecting tube is connected to the shell.

[0006] As a further preferred embodiment, the cutting assembly includes a first cutter, a second cutter and a feed collection unit; the first cutter is fixedly connected to the left inner side of the shell; the second cutter is fixedly connected to the right inner side of the shell; and the feed collection unit for collecting finished material rods is connected to the shell.

[0007] As a further preferred solution, the feed collection unit includes a feeder and a collection box; the feeder is fixedly connected to the front side of the shell; and the collection box is placed on the lower side of the shell.

[0008] As a further preferred solution, the cold air assembly includes an air collecting hood and a guide plate; the air collecting hood is fixedly connected to the upper inner side of the shell; the guide plate is arranged at the bottom of the air collecting hood; and an air pump is arranged in the air collecting hood.

[0009] As a further preferred solution, the connecting tube is made of brass.

[0010] As a further preferred solution, a return pipe is also included; the air outlet of the vacuum pump in the air collecting hood is connected to the return pipe, and a filter is arranged at the outlet of the return pipe.

[0011] As a further preferred solution, the filter screen arranged at the outlet of the return pipe is arranged inclined.

[0012] As a further preferred embodiment, the cleaning system includes a driving member, an extrusion plate, an extrusion rod, a connecting plate, an elastic member and a cleaning ring; a plurality of driving members are fixedly connected to the upper inner side of the outer shell; the telescopic ends of the plurality of driving members are commonly fixedly connected to the extrusion plate; a connecting plate is slidably connected in each connecting tube; a cleaning ring for cleaning agglomerated material residues in the through hole is fixedly connected to the upper side of each connecting plate; the outer diameter of each cleaning ring is the same as the inner diameter of the through hole; an extrusion rod is commonly fixedly connected to the upper side of adjacent connecting plates, and a through groove for the extrusion rod to pass through is provided on the first cutter and the second cutter; each extrusion rod is fixedly connected to a plurality of elastic members; the other end of each elastic member is fixedly connected to the first extrusion ring.

[0013] As a further preferred solution, the contact point between the extrusion rod and the extrusion plate is configured to be in a ball head shape.

[0014] As a further preferred solution, the cleaning ring is an annular thin sheet.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention realizes that the hot air blown by the hot air blower is blown toward the connecting tube, so that the connecting tube is heated by the hot air, and then the heat is transferred to the remaining material rods in the connecting tube, so that the temperature of the material rods is increased, and the material rods in the connecting tube are preheated, which helps to improve the cohesive force of the material rods and prevent the material rods from being broken during cutting;

[0016] The exhaust pump installed in the air collecting hood exhausts air into the shell, allowing the external cold air to enter the shell through the outlet at the bottom of the shell to cool the material rod, so that the surface of the material rod is cooled and hardened to achieve a stable hardness. At the same time, the cold air takes away the debris generated by the material rod during cutting, and the upward airflow lifts the falling material rod, reducing the falling speed of the material rod, thereby reducing the impact force between the material rod and the shell, avoiding the material rod from breaking, and improving the protection effect of the material rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the biomass fuel pellet machine of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the hot air blower, servo motor and pulley combination of the present invention;

[0019] Figure 3 It is a schematic diagram of the combined three-dimensional structure of the feeder, the first extrusion ring and the second extrusion ring of the present invention;

[0020] Figure 4 It is a combined cross-sectional view of the cutting assembly, the gas collecting hood and the guide plate of the present invention;

[0021] Figure 5 It is a combined cross-sectional view of the first extrusion ring, the second extrusion ring and the extrusion barrel of the present invention;

[0022] Figure 6 It is a schematic diagram of the combined three-dimensional structure of the driving member, the extrusion plate and the extrusion rod of the present invention;

[0023] Figure 7 It is a front view of the combination of the driving member, the extrusion plate and the extrusion rod of the present invention;

[0024] Figure 8 A top view of the second extrusion ring, the extrusion plate and the extrusion rod assembly of the present invention;

[0025] Fig. 9 It is a schematic diagram of the combined three-dimensional structure of the connecting plate, the elastic member and the cleaning ring of the present invention;

[0026] Fig.10 This is a simplified schematic diagram of the working principle of the cleaning system of the present invention, wherein the left one is the initial state and the right one is the working state of the cleaning system.

[0027] Wherein: 1-housing, 1001-vent, 2-extrusion wheel, 3-first extrusion ring, 3001-first extrusion hole, 4-second extrusion ring, 4001-second extrusion hole, 5-connecting cylinder, 5001-through hole, 6-hot air blower, 101-servo motor, 102-pulley, 103-feeder, 104-first cutter, 105-second cutter, 106-collection box, 201-air collecting hood, 202-guide plate, 203-return pipe, 301-driving member, 302-extrusion plate, 303-extrusion rod, 304-connecting plate, 305-elastic member, 306-cleaning ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figure 1-Figure 5 As shown, a biomass fuel pellet machine includes a shell 1, a power assembly, an extrusion wheel 2, a first extrusion ring 3 and a second extrusion ring 4; the shell 1 is connected to the power assembly; the power assembly is connected to two extrusion wheels 2; the extrusion wheels 2 are driven to rotate by the power assembly; the shell 1 is connected to the first extrusion ring 3; the first extrusion ring 3 is provided with a plurality of first extrusion holes 3001; the first extrusion ring 3 is fitted with the extrusion wheel 2; the shell 1 is connected to the second extrusion ring 4; the diameter of the second extrusion ring 4 is larger than that of the first extrusion ring 3; the second extrusion ring 4 is provided with a plurality of second extrusion holes 4001; each second extrusion hole 4001 corresponds to the position of an adjacent first extrusion hole 3001;

[0031] It also includes a cutting component, a connecting tube 5, a hot air blower 6, a cold air component and a cleaning system; a cutting component is connected inside the outer shell 1; a plurality of connecting tubes 5 are connected between the first extrusion ring 3 and the second extrusion ring 4; each connecting tube 5 is located between two adjacent first extrusion holes 3001 and the second extrusion holes 4001; a through hole 5001 is provided on the inner side of each connecting tube 5; two symmetrical vents 1001 are provided on the outer shell 1, and the vents 1001 pass through the front and rear sides of the outer shell 1; two hot air blowers 6 are connected to the rear side of the outer shell 1, and warm air passes through the vents 1001 from back to front through the hot air blowers 6; a cold air component is connected to the outer shell 1; and a cleaning system is connected to the outer shell 1.

[0032] The power assembly includes a servo motor 101 and a pulley 102; the servo motor 101 is fixedly connected to the rear side of the housing 1; the output end of the servo motor 101 is fixedly connected to the extrusion wheel 2 located on the left; the pulley 102 is fixedly connected to the rear sides of the two extrusion wheels 2.

[0033] The cutting assembly includes a first cutter 104, a second cutter 105 and a feed collection unit; the first cutter 104 is fixedly connected to the left inner side of the shell 1; the second cutter 105 is fixedly connected to the right inner side of the shell 1; and the feed collection unit is connected to the shell 1.

[0034] The feed collection unit includes a feeder 103 and a collection box 106 ; the feeder 103 is fixedly connected to the front side of the housing 1 ; and the collection box 106 is placed on the lower side of the housing 1 .

[0035] The cold air assembly includes an air collecting hood 201 and a guide plate 202 ; the air collecting hood 201 is fixedly connected to the upper inner side of the housing 1 ; the guide plate 202 is arranged at the bottom of the air collecting hood 201 ; and an air pump is arranged inside the air collecting hood 201 .

[0036] The following is an explanation of the extrusion wheel 2 located on the left side. First, the staff pours the biomass powder into the feeder 103, so that the biomass powder enters the first extrusion ring 3 along the feeder 103. It should be noted that the biomass powder in the first extrusion ring 3 is loose and will not fall out of the first extrusion ring 3.

[0037] Subsequently, based on the view from the front to the back, the servo motor 101 is controlled to drive the extrusion wheel 2 to rotate counterclockwise, and the other extrusion wheel 2 is driven to rotate in the same manner through the pulley 102, so that the two extrusion wheels 2 drive the connecting cylinder 5 to rotate counterclockwise in the same manner through the friction force, and then drive the second extrusion ring 4 to rotate in the same manner. When the connecting cylinder 5 between the first extrusion ring 3 and the second extrusion ring 4 gradually rotates to the left side of the shell 1, the biomass powder will gradually move toward the first extrusion hole 3001 under the extrusion of the extrusion wheel 2 on the left side of the shell 1, and in the subsequent counterclockwise left rotation of the connecting cylinder 5, the biomass powder is squeezed and compacted at the position where the extrusion wheel 2 and the first extrusion ring 3 are squeezed, and gradually forms a material rod after being squeezed against each other in the first extrusion hole 3001, the through hole 5001 and the second extrusion hole 4001, and then moves along the first extrusion hole 3001, the through hole 5001 and the first extrusion hole 3001. The second extrusion hole 4001 is gradually exposed outside the second extrusion ring 4. At this time, the connecting tube 5 continues to rotate, so that the material rod exposed to the second extrusion ring 4 contacts the first cutter 104 as the second extrusion ring 4 rotates, and is cut off by the first cutter 104 in the process of the material rod passing over the first cutter 104. The cut material rod will fall on the shell 1 and gradually fall into the collection box 106 along the shell 1 under the influence of gravity, so as to collect the material rod. At the same time, in the process of the material rod being cut off by the first cutter 104, the shell 1 is evacuated by the exhaust pump provided in the air collecting hood 201, so that the external cold air enters the shell 1 through the discharge port at the bottom of the shell 1, cools the material rod, and cools and hardens the surface of the material rod to achieve a stable hardness. At the same time, the cold air takes away the debris generated by the material rod during cutting, and the upward airflow lifts the falling material rod to reduce the falling speed of the material rod.

[0038] Afterwards, after the connecting tube 5 passes over the first cutter 104, there are uncut material rods left in the connecting tube 5. After the connecting tube 5 continues to rotate with the first extrusion ring 3 and the second extrusion ring 4, since the hot air blower 6 always blows hot air to the vent 1001, the hot air passes through the outer shell 1 from back to front. Therefore, when the connecting tube 5 rotates to the vent 1001, the hot air blown by the hot air blower 6 will blow through the connecting tube 5, so that the connecting tube 5 is heated by the hot air, and then the heat is transferred to the remaining material rods in the connecting tube 5, so that the temperature of the material rods is increased, thereby preheating the material rods in the connecting tube 5, which helps to increase the cohesion of the material rods and prevent the material rods from breaking during cutting.

[0039] Subsequently, the connecting cylinder 5 continues to rotate with the first extrusion ring 3 and the second extrusion ring 4. After the connecting cylinder 5 passes over the vent 1001, the biomass powder is gradually squeezed into a new material rod under the extrusion of the extrusion wheel 2 on the right side, thereby pushing the preheated material rod in the connecting cylinder 5 to the outside of the second extrusion ring 4, and making the preheated material rod in the connecting cylinder 5 gradually exposed to the outside of the second extrusion ring 4. As the connecting cylinder 5 continues to rotate, the material rod exposed to the outside of the second extrusion ring 4 is cut off by the second cutter 105 and falls on the outer shell 1. Under the influence of gravity, it gradually falls along the outer shell 1 into the collecting box 106, thereby realizing the cutting of the preheated material rod. At the same time, the air collecting hood 201 exhausts air in the outer shell 1. The material rods exposed outside the second extrusion ring 4 are cooled. At this time, the material rods squeezed into the connecting barrel 5 by the extrusion wheel 2 on the right side remain in the connecting barrel 5. Then, the connecting barrel 5 passes the second cutter 105 and continues to rotate. After the connecting barrel 5 rotates to the vent 1001 on the upper side, the hot air blown by the hot air blower 6 on the upper side is preheated to the remaining material rods in the connecting barrel 5. The connecting barrel 5 continues to rotate, and the extrusion wheel 2 on the left side squeezes the biomass powder into new material rods, and extrude the preheated material rods from the connecting barrel 5, so that they are exposed outside the second extrusion ring 4. They are cut off by the first cutter 104 while the connecting barrel 5 continues to rotate and fall into the collecting box 106. This is repeated until the production needs are met.

[0040] The connecting tube 5 is made of brass material, which enhances the thermal conductivity of the connecting tube 5 and improves the preheating effect on the remaining material rods in the connecting tube 5 .

[0041] It also includes a return pipe 203; the air outlet of the vacuum pump in the air collecting hood 201 is connected to the return pipe 203, and a filter is arranged at the outlet of the return pipe 203. The airflow ejected from the air outlet of the vacuum pump and the material rod debris enter the return pipe 203, and the airflow is normally discharged to the outside through the filter, while the material rod debris is intercepted by the filter, and after a certain amount of accumulation, it falls back into the feeder 103 under the action of gravity, and the material rod debris collected by the air collecting hood 201 is transported back to the feeder 103 through the return pipe 203 to avoid waste of debris.

[0042] The filter screen arranged at the outlet of the return pipe 203 is arranged at an angle to facilitate the material rod debris to fall back into the feeder 103 .

[0043] Example 2

[0044] On the basis of Example 1, Figure 1 , Figure 2 and Figure 6-Figure 10As shown, the cleaning system includes a driving member 301, an extrusion plate 302, an extrusion rod 303, a connecting plate 304, an elastic member 305 and a cleaning ring 306; two driving members 301 are fixedly connected to the upper inner side of the housing 1, and the driving member 301 is an electric push rod; the telescopic ends of the two driving members 301 are commonly fixedly connected to the extrusion plate 302; a connecting plate 304 is slidably connected in each connecting cylinder 5; a cleaning ring 306 is fixedly connected to the upper side of each connecting plate 304; the outer diameter of each cleaning ring 306 is the same as the inner diameter of the through hole 5001; the upper sides of adjacent connecting plates 304 are commonly fixedly connected to the extrusion rod 303, and the first cutter 104 and the second cutter 105 are provided with a through groove for the extrusion rod 303 to pass through; each extrusion rod 303 is fixedly connected to a plurality of elastic members 305, and the elastic members 305 are springs; the other end of each elastic member 305 is fixedly connected to the first extrusion ring 3.

[0045] During the process of the extrusion wheel 2 squeezing the biomass powder into the connecting cylinder 5, if the slag agglomerates in the through hole 5001, the material rods produced during the operation of the pellet machine will have large-scale scratches on the sides. Therefore, when this phenomenon occurs, the driving member 301 is controlled to move the extrusion plate 302 downward, and the extrusion plate 302 moves downward, so that the extrusion rod 303 will move downward under the extrusion of the extrusion plate 302. The extrusion rod 303 drives the cleaning ring 306 to move downward through the corresponding connecting plate 304, and compresses the elastic member 305, so that the cleaning ring 306 scratches the inner wall of the through hole 5001 during the downward movement, so that the agglomerated slag adhered to the inner wall of the through hole 5001 is separated from the inner wall of the through hole 5001, thereby cleaning the inner wall of the through hole 5001 and avoiding The side of the material rod is scratched by the agglomerated material residue, and scratches appear. In order to improve the product quality, it should be noted that when cleaning the inner wall of the through hole 5001, the connecting tube 5 can continue to rotate, so that the elastic member 305 that is gradually away from the extrusion plate 302 gradually returns to its original state, so that the cleaning ring 306 moves upward and scratches the inner wall of the through hole 5001, thereby realizing secondary cleaning of the inner wall of the through hole 5001 and improving the cleaning effect of the agglomerated material residue on the inner wall of the through hole 5001. The elastic member 305 close to the extrusion plate 302 is gradually compressed under the extrusion of the extrusion plate 302, and then the corresponding inner wall of the through hole 5001 is cleaned. When the side of the material rod that falls into the collection box 106 no longer has scratches, the driving member 301 is controlled to move the extrusion plate 302 upward, so that the pellet machine continues to operate and completes production needs.

[0046] It should be noted that the connection between the extrusion rod 303 and the connecting plate 304 is restricted by the second extrusion ring 4, so it will not pop out from the second extrusion ring 4 to affect the operation of the equipment.

[0047] The contact point between the extrusion rod 303 and the extrusion plate 302 is configured to be in a ball head shape, so as to reduce the friction between the extrusion rod 303 and the extrusion plate 302 and increase the service life.

[0048] The cleaning ring 306 is an annular thin sheet; when the cleaning ring 306 moves upward and downward along the inner wall of the through hole 5001, the cleaning ring 306 has a shoveling effect on the agglomerated slag when cleaning the agglomerated slag, avoiding excessive adhesion of the agglomerated slag and improving the cleaning effect of the cleaning ring 306 on the agglomerated slag.

[0049] The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be interpreted in any way as limiting the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the embodiments of the present invention without creative work, and these methods will fall within the protection scope of the embodiments of the present invention.

Claims

1. A biomass fuel pellet machine, comprising a housing (1), a power assembly, an extrusion wheel (2), a first extrusion ring (3) and a second extrusion ring (4); the housing (1) is connected to the power assembly; a plurality of extrusion wheels (2) are connected to the power assembly; the extrusion wheel (2) is driven to rotate by the power assembly; the housing (1) is connected to the first extrusion ring (3); the first extrusion ring (3) is provided with a plurality of first extrusion holes (3001); the first extrusion ring (3) is fitted with the extrusion wheel (2); the housing (1) is connected to the second extrusion ring (4); the diameter of the second extrusion ring (4) is larger than that of the first extrusion ring (3); the second extrusion ring (4) is provided with a plurality of second extrusion holes (4001); each second extrusion hole (4001) corresponds to the position of an adjacent first extrusion hole (3001); the characteristics are as follows: The invention also comprises a cutting assembly, a connecting tube (5), a hot air blower (6), a cold air assembly and a cleaning system; a cutting assembly for cutting off a material rod is connected inside the outer shell (1); a plurality of connecting tubes (5) are connected between the first extrusion ring (3) and the second extrusion ring (4); each connecting tube (5) is located between two adjacent first extrusion holes (3001) and second extrusion holes (4001); a through hole (5001) is provided on the inner side of each connecting tube (5); a plurality of vents (1001) are provided on the outer shell (1), and the vents (1001) penetrate the front side and the rear side of the outer shell (1); a plurality of hot air blowers (6) are connected to the outer shell (1); a cold air assembly for cooling the cut material rod is connected to the outer shell (1); and a cleaning system for cleaning agglomerated material residues in the connecting tube (5) is connected to the outer shell (1).

2. A biomass fuel pellet machine according to claim 1, characterized in that: The cutting assembly comprises a first cutting knife (104), a second cutting knife (105) and a feed collection unit; the first cutting knife (104) is fixedly connected to the left inner side of the outer shell (1); the second cutting knife (105) is fixedly connected to the right inner side of the outer shell (1); and the feed collection unit for collecting finished material rods is connected to the outer shell (1).

3. A biomass fuel pellet machine according to claim 2, characterized in that: The feed collection unit comprises a feeder (103) and a collection box (106); the feeder (103) is fixedly connected to the front side of the housing (1); and the collection box (106) is placed on the lower side of the housing (1).

4. The biomass fuel pellet machine according to claim 3, characterized in that: The cold air component comprises an air collecting hood (201) and a guide plate (202); the air collecting hood (201) is fixedly connected to the upper inner portion of the outer shell (1); the guide plate (202) is arranged at the bottom of the air collecting hood (201); and an air pump is arranged in the air collecting hood (201).

5. The biomass fuel pellet machine according to claim 4, characterized in that: The connecting tube (5) is made of brass.

6. The biomass fuel pellet machine according to claim 4, characterized in that: It also includes a return pipe (203); the air outlet of the air pump in the air collecting hood (201) is connected to the return pipe (203), and a filter screen is provided at the outlet of the return pipe (203).

7. The biomass fuel pellet machine according to claim 6, characterized in that: The filter screen arranged at the outlet of the return pipe (203) is arranged in an inclined manner.

8. The biomass fuel pellet machine according to claim 7, characterized in that: The cleaning system comprises a driving member (301), an extrusion plate (302), an extrusion rod (303), a connecting plate (304), an elastic member (305) and a cleaning ring (306); a plurality of driving members (301) are fixedly connected to the upper inner side of the housing (1); the telescopic ends of the plurality of driving members (301) are commonly fixedly connected to the extrusion plate (302); a connecting plate (304) is slidably connected to the inside of each connecting tube (5); a spring for cleaning the through hole (5) is fixedly connected to the upper side of each connecting plate (304); 001); the outer diameter of each cleaning ring (306) is the same as the inner diameter of the through hole (5001); an extrusion rod (303) is fixedly connected to the upper side of adjacent connecting plates (304), and a through groove for allowing the extrusion rod (303) to pass through is formed on the first cutting knife (104) and the second cutting knife (105); each extrusion rod (303) is fixedly connected to a plurality of elastic members (305); and the other end of each elastic member (305) is fixedly connected to the first extrusion ring (3).

9. The biomass fuel pellet machine according to claim 8, characterized in that: The contact point between the extrusion rod (303) and the extrusion plate (302) is configured to be in the shape of a ball head.

10. The biomass fuel pellet machine according to claim 8, characterized in that: The cleaning ring (306) is an annular thin sheet.

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