A wood chip pelletizer

Abstract

The present application relates to the technical fields of granulating equipment, and the wood chip granule forming machine comprises a lower support, the top of the lower support is fixed with a support shell, the lower support is fixed with a main motor, the support shell is rotationally connected with a support table, the output end of the main motor is connected with a transmission column at the bottom of the support table through a belt roller, and the support table is provided with a compression roller mechanism; when the convex block slides to the arc-shaped section, the cutting ring moves downward and contacts the columnar particles extruded outside the forming hole, the cutting action is completed, and then it is reset above the forming hole, so that the columnar particles continuously extruded can be regularly cut, partial wood chip particles cannot be extruded outside the forming ring mold, the residual material is prevented from being extruded and spliced into a long strip-shaped irregular particle again, and the self-cutting effect of the reverse operation of the forming ring mold and the compression roller mechanism is matched, so that the size consistency and compliance of the output particles are double-protected.

Description

Technical Field

[0001] This invention belongs to the field of pelletizing equipment technology, specifically relating to a wood pellet forming machine. Background Technology

[0002] Wood pellet forming machines, also known as biomass pellet mills, use wood chips, straw, and other biomass waste as main raw materials. After pretreatment, they are processed into dense pellets through extrusion molding. They are widely used in industries such as biomass power generation, boiler fuel, livestock bedding, and biomass fuel processing.

[0003] Existing wood pellet forming machines generally employ a structure of pressure rollers and forming ring dies. The relative rotation of the pressure rollers and forming ring dies generates extrusion pressure, forcing the wood pellets into the forming holes of the forming ring dies, thus achieving pellet formation. However, existing equipment has significant shortcomings in actual operation. Its cutting function relies solely on the mutually counter-rotating forming ring dies and pressure rollers. This cutting method is limited to the inner wall of the forming ring die and cannot effectively cut and clean the material at the outer opening of the forming ring die. This easily leads to some wood pellets remaining on the outside of the forming ring die's opening and failing to exit smoothly. These residual wood pellets will be re-extruded during subsequent pelleting, eventually forming long, non-compliant pellets, severely affecting the size consistency of the produced pellets. Therefore, to address the shortcomings of the existing technology, a wood pellet forming machine needs to be designed to solve this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a wood pellet forming machine with a simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A wood pellet forming machine includes a lower support, a support shell fixed to the top of the lower support, a main motor fixed to the lower support, a support platform rotatably connected to the support shell, the output end of the main motor connected to a transmission column at the bottom of the support platform via a belt pulley, a pressure roller mechanism on the support platform, a forming ring die rotatably connected to the support shell, an upper drive mechanism connected to the forming ring die, and an auxiliary cutting mechanism on the forming ring die; the pressure roller mechanism includes an outer ring body rotatably connected to the support platform via a damping bearing, an inner support rotatably connected to the outer ring body, a reverse blowing mechanism on the inner support, and an extrusion ring rotatably connected to the outside of the inner support, the side wall of the extrusion ring having an elongated connecting groove, and the bottom of the extrusion ring fixed to the outer ring body.

[0006] As a further optimization of the present invention, the reverse blowing mechanism includes an air outlet hole opened on the inner support side wall, an air inlet pipe fixedly connected in the inner support, the air inlet pipe communicating with the air outlet hole, and a lower pipe for connecting to an air source rotatably connected to the bottom end of the air inlet pipe.

[0007] As a further optimization of the present invention, a limiting groove is uniformly opened on the inner wall of the outer ring body, a limiting block is uniformly arranged at the bottom of the side wall of the inner support and slidably connected in the limiting groove, a lower gear is fixed at the bottom of the inner support, and a lower gear ring meshing with the lower gear is fixed on the inner wall of the support shell.

[0008] As a further optimization of the present invention, the auxiliary cutting mechanism includes a guide groove formed on the top of the inner wall of the support shell, the guide groove including a support section and an arc-shaped section at both ends communicating with the support section.

[0009] As a further optimization of the present invention, a plurality of cutting rings are slidably connected to the outer wall of the forming ring mold, and the cutting rings are all fixed on the connecting strip. The top of one side of the connecting strip is slidably connected to a slide rail opened at the top of the outer wall of the forming ring mold, and a protrusion is provided on the connecting strip that is slidably connected to the guide groove.

[0010] As a further optimization of the present invention, the upper drive mechanism includes a mounting shell fixed to the top of the support shell, an upper motor fixedly mounted on one side of the top of the mounting shell, and a feeding shell provided on the other side of the top of the mounting shell.

[0011] As a further optimization of the present invention, the output end of the upper motor is fixed with an upper gear through the mounting shell, and an upper gear ring is meshed on the upper gear and fixedly sleeved on the top of the forming ring mold.

[0012] As a further optimization of the present invention, a discharge impeller is fixed at the bottom of the forming ring die, the bottom of the discharge impeller is rotatably connected to the support platform, and a guide block is provided at the top center of the support platform.

[0013] As a further optimization of the present invention, a discharge hopper is provided on the side wall of the support shell, and a through groove is provided at the connection between the support shell and the discharge hopper.

[0014] The beneficial effects of this invention are as follows: 1. The auxiliary cutting mechanism of this invention can rotate synchronously with the forming ring die during operation. The support section and arc section of its guide groove, together with the spherical protrusion, drive the connecting strip and multiple cutting rings to perform intermittent up-and-down reciprocating motion. When the protrusion slides to the arc section, the cutting ring moves downward and contacts the columnar particles extruded from the outside of the forming hole, completing the cutting action. Then it returns to the top of the forming hole, and so on. This cycle can neatly cut the continuously extruded columnar particles, preventing some wood chips from remaining on the outside of the forming ring die and being unable to come out. It also prevents the residual material from being squeezed and spliced ​​into long strips of non-compliant particles. At the same time, the self-cutting effect of the forming ring die and the pressure roller mechanism rotating in opposite directions ensures the consistency and compliance of the size of the produced particles.

[0015] 2. The pressure roller mechanism of the present invention consists of an outer ring body, an inner support, an extrusion ring, and a reverse blowing mechanism. During pelleting, the main motor drives the lower gear at the bottom of the inner support to rotate while revolving around the central axis, causing the inner support to rotate. The limiting block slides to one side of the limiting groove and is limited, thereby driving the outer ring body and the extrusion ring to rotate synchronously. At this time, the inner wall of the extrusion ring blocks the air outlet of the inner support, and the outer wall of the inner support blocks the connecting groove of the extrusion ring, forming a complete pressure roller structure. This can provide stable crushing and extrusion force and avoid pressure leakage or blockage caused by wood chips entering the air outlet due to air port exposure. After pelleting is completed, the main motor drives in the reverse direction, and the limiting block slides in the reverse direction to the other side of the limiting groove. The connecting groove is connected to the corresponding air outlet. The air pump at the bottom of the support platform delivers air to the air outlet through the lower pipe and the air inlet pipe. The gas is blown through the connecting groove to the contact area between the pressure roller mechanism and the forming ring die and the forming hole of the forming ring die, blowing off residual wood chips and impurities. No manual cleaning is required, reducing the later maintenance cost.

[0016] 3. During the cleaning process, the auxiliary cutting mechanism of this invention rotates synchronously in the opposite direction with the forming ring mold, maintaining intermittent cutting action. This can cut off the loose and incompletely detached residual material during the air blowing process, preventing it from adhering to the outer wall of the forming ring mold or the outlet of the forming hole. This achieves synergistic cooperation between air blowing cleaning and intermittent cutting, ensuring thorough cleaning without dead corners. At the same time, there is no need to add additional cleaning drive components, simplifying the structure and reducing the cost of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the position of the pressure roller mechanism in this invention; Figure 3 This is a schematic diagram of the upper drive mechanism in this invention; Figure 4 This is a schematic diagram of the guide groove in this invention; Figure 5 This is a partial three-dimensional structural diagram of the present invention; Figure 6 This is a schematic diagram of the reverse blowing mechanism in this invention; Figure 7 This is a schematic diagram showing the location of the auxiliary cutting mechanism in this invention; Figure 8 yes Figure 7 A magnified view of a portion of region A in the middle; Figure 9 This is a schematic diagram of the assembly structure of the reverse blowing mechanism in this invention.

[0018] In the diagram: 1. Lower support; 2. Main motor; 3. Support shell; 4. Support platform; 5. Transmission column; 6. Pressure roller mechanism; 7. Forming ring die; 8. Auxiliary cutting mechanism; 9. Upper drive mechanism; 10. Guide block; 11. Discharge hopper; 12. Feed shell; 13. Discharge impeller; 61. Outer ring; 62. Inner support; 63. Reverse air blowing mechanism; 64. Extrusion ring; 65. Connecting groove; 81. Guide groove; 82. Cutting ring; 83. Connecting strip; 84. Protrusion block; 91. Mounting shell; 92. Upper motor; 93. Upper gear; 94. Upper gear ring; 631. Air outlet; 632. Air inlet pipe; 633. Lower pipe; 634. Limiting groove; 635. Limiting block; 636. Lower gear; 637. Lower gear ring; 811. Support section; 812. Arc-shaped section. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example: Please refer to Figures 1-9 A wood pellet forming machine includes a lower support 1, a support shell 3 fixed to the top of the lower support 1, a main motor 2 fixedly installed on one side of the top of the lower support 1, a support platform 4 rotatably connected inside the support shell 3, the output end of the main motor 2 connected to the bottom end of a transmission column 5 via a belt pulley, the transmission column 5 fixed at the bottom center of the support platform 4, a pressure roller mechanism 6 for pressing wood pellets provided on the support platform 4, and a forming ring die 7 rotatably connected to the support shell 3. The forming ring die 7 has an annular structure with evenly spaced forming holes on its sidewalls. (The forming ring die 7 is an existing type of forming machine.) (The technology will not be elaborated on here.) The pressure roller mechanism 6, together with the rotating forming ring die 7, can squeeze the extruded wood chips out of the forming hole to achieve the pelleting process. The forming ring die 7 is connected to an upper drive mechanism 9 for driving the forming ring die 7 to rotate. The forming ring die 7 is provided with an auxiliary cutting mechanism 8, which is located on the outside of the forming ring die 7. It can intermittently cut the extruded material during the forming process to prevent some wood chips from remaining on the outside of the forming ring die 7 and being unable to come out, resulting in multiple extrusions and splicing into long strips of non-compliant particles.

[0021] Please see Figure 1 and Figures 3-7The upper drive mechanism 9 includes a mounting shell 91 fixed to the top of the support shell 3. An upper motor 92 is fixedly mounted on one side of the top of the mounting shell 91, and a feeding shell 12 is provided on the other side of the top of the mounting shell 91. The feeding shell 12 is located directly above the pressure roller mechanism 6. An upper gear 93 is fixed through the mounting shell 91 at the output end of the upper motor 92. The upper gear 93 meshes with an upper gear ring 94. The upper gear ring 94 is fixedly sleeved on the top of the forming ring mold 7. A discharge impeller 13 is fixed at the bottom of the forming ring mold 7. The bottom of the discharge impeller 13 is rotatably connected to the support platform 4. A guide block 10 is provided at the top center of the support platform 4. The top of the guide block 10 is an arc-shaped dome to prevent the material falling from the feeding shell 12 from accumulating at the top center of the support platform 4. A discharge hopper 11 for discharging material is provided on the side wall of the support shell 3, and a through groove is provided at the connection between the support shell 3 and the discharge hopper 11.

[0022] During operation, the main motor 2 and the upper motor 92 in the upper drive mechanism 9 are started synchronously. The main motor 2 drives the transmission column 5 to rotate at a constant speed through belt and roller transmission. Since the transmission column 5 is fixed at the bottom center of the support platform 4, it drives the support platform 4 and the pressure roller mechanism 6 and guide block 10 set on it to rotate synchronously. At the same time, the upper motor 92 is energized and outputs power, driving the upper gear 93 fixed at its output end to rotate. The upper gear 93 meshes with the upper gear ring 94 fixedly sleeved on the top of the forming ring die 7, thereby driving the forming ring die 7 to rotate at a constant speed on the support shell 3. The rotation direction of the forming ring die 7 is opposite to the rotation direction of the support platform 4 and the pressure roller mechanism 6, providing relative crushing power for subsequent wood chip extrusion molding. After the main motor 2 and the upper motor 92 are running stably and each rotating component reaches the preset speed, the pre-treated qualified wood chip raw material is fed into the equipment from the feeding shell 12. The feeding shell 12 is located directly above the pressure roller mechanism 6. The wood chip raw material falls directly onto the top of the support platform 4 through the feeding shell 12. Since there is a guide block at the center of the top of the support platform 4, the wood chip raw material is rotated at a constant speed. Material block 10, with its top being an arc-shaped dome, effectively prevents wood chips from accumulating at the center of the support platform 4. As the support platform 4 rotates, the wood chips are evenly dispersed to the top edge of the support platform 4 under the guidance of centrifugal force and the arc-shaped surface of the guide block 10, and precisely conveyed to the extrusion area between the pressure roller mechanism 6 and the forming ring die 7. The pressure roller mechanism 6 rotates in the opposite direction with the support platform 4, while the forming ring die 7 rotates synchronously in the forward direction, creating a continuous crushing and extrusion force between them. The wood chips dispersed in the extrusion area are forcibly squeezed into the forming holes evenly opened on the side wall of the forming ring die 7 under the crushing action of the pressure roller mechanism 6. Under the constraint of the forming holes, the wood chips are gradually squeezed and compacted, forming columnar particles that match the shape and size of the forming holes. Under the continuous extrusion force, the columnar particles are slowly squeezed out from the outer orifice of the forming ring die 7, completing the initial forming of the particles. The forming ring die 7 and the pressure roller mechanism 6, which rotate in opposite directions, have a self-cutting effect, which can cut the formed wood chips from the inner wall of the forming ring die 7. During the process of extruding columnar particles from the outside of the forming ring die 7, the auxiliary cutting mechanism 8 set on the forming ring die 7 works synchronously. The auxiliary cutting mechanism 8 is located on the outside of the forming ring die 7 and rotates with the forming ring die 7 to intermittently cut the extruded columnar particles. Through the intermittent cutting action, it effectively prevents some wood chips from remaining on the outside of the forming ring die 7 and being unable to come out, and avoids the remaining wood chips from being squeezed and spliced ​​into long strips of non-compliant particles, thus ensuring the size consistency and compliance of the produced particles. After being cut by the auxiliary cutting mechanism 8, the qualified wood chips fall onto the discharge impeller 13 at the bottom of the forming ring die 7 under their own gravity. The discharge impeller 13 is fixed to the bottom of the forming ring die 7 and rotates synchronously with the forming ring die 7. The annular protrusion at its bottom is rotatably connected to the annular groove opened on the top of the support platform 4 to ensure rotational stability. During the rotation of the discharge impeller 13, the falling wood chips are guided to the through groove opened on the side wall of the support shell 3. The wood chips enter the discharge hopper 11 set on the side wall of the support shell 3 through the through groove, and are finally discharged from the equipment through the discharge hopper 11, completing the entire process of forming and discharging wood chips.

[0023] Please see Figures 2-3 , Figures 5-7 and Figure 9 The pressure roller mechanism 6 includes an outer ring body 61 rotatably connected to the support platform 4 via a damping bearing. An inner support 62 is rotatably connected to the outer ring body 61. A reverse air blowing mechanism 63 for blowing air during cleaning is provided on the inner support 62. A compression ring 64 is rotatably connected to the outside of the inner support 62. An elongated connecting groove 65 is opened on the side wall of the compression ring 64. The bottom of the compression ring 64 is fixed to the outer ring body 61. The reverse air blowing mechanism 63 includes an air outlet 631 opened on the side wall of the inner support 62. An air inlet pipe 632 is fixedly connected to the inner support 62. 632 is connected to the air outlet 631. The bottom end of the air inlet pipe 632 is rotatably connected to the lower pipe 633 for connecting to the air source. During operation, the air pump connected to the air source is fixed at the bottom of the support platform 4. Limiting grooves 634 are evenly opened at the bottom of the inner wall of the outer ring body 61. Limiting blocks 635 are evenly arranged at the bottom of the side wall of the inner support 62. The limiting blocks 635 are slidably connected in the limiting grooves 634. A lower gear 636 is fixed at the bottom of the inner support 62. A lower gear ring 637 is fixed on the inner wall of the support shell 3. The lower gear ring 637 meshes with the lower gear 636.

[0024] When wood pellet forming is required, the main motor 2 is started. The main motor 2 drives the transmission column 5 and the support platform 4 fixed on the transmission column 5 to rotate synchronously. During the rotation of the support platform 4, the pressure roller mechanism 6 rotates as a whole. At this time, the lower gear 636 at the bottom of the inner support 62 revolves synchronously with the support platform 4. At the same time, since the lower gear 636 meshes with the lower gear ring 637 on the inner wall of the support shell 3, the lower gear 636 rotates around its own axis while revolving, thereby driving the inner support 62 to rotate synchronously. At this time, the outer ring 61 remains stationary in its initial state under the damping action of the damping bearing. As the inner support 62 rotates, the inner support 62 side... The limiting block 635 at the bottom of the wall slides continuously within the limiting groove 634 until it slides to one side of the limiting groove 634 and is limited. After the limiting block 635 is limited, the rotation of the inner support 62 drives the outer ring 61 to rotate synchronously. At this time, the extrusion ring 64 moves synchronously with the outer ring 61. The inner wall of the extrusion ring 64 completely blocks the air outlet 631 on the side wall of the inner support 62. At the same time, the outer wall of the inner support 62 blocks the connecting groove 65 on the extrusion ring 64. The entire extrusion ring 64 and the inner support 62 combine to form a complete pressure roller structure. With the help of the rotating forming ring die 7, the wood chip raw material is crushed and extruded to complete the pelleting process.

[0025] When granulation is complete and cleaning of the pressure roller mechanism 6 and forming ring die 7 is required, stop granulation feeding and switch both the main motor 2 and the upper motor 92 in the upper drive mechanism 9 to reverse drive mode. When the main motor 2 reverses drive, it drives the transmission column 5, support platform 4, and pressure roller mechanism 6 to rotate in the opposite direction. The lower gear 636 at the bottom of the inner support 62 revolves in the opposite direction with the support platform 4. At the same time, under the meshing action of the lower gear ring 637, the lower gear 636 rotates in the opposite direction around its own axis, driving the inner support 62 to rotate in the opposite direction. During the reverse rotation of the inner support 62, the limiting block 635 at the bottom of its side wall slides in the opposite direction along the limiting groove 634 at the bottom of the inner wall of the outer ring body 61 until the limiting block 635 slides to the limit. The other side of the groove 634 is limited; after being limited, the extrusion ring 64 moves synchronously in the opposite direction with the inner support 62 and the outer ring body 61 under the drive of the limiting block 635. After being limited, the connecting groove 65 on the extrusion ring 64 is precisely aligned with and fully connected to the air outlet 631 on the side wall of the inner support 62. The air pump fixed at the bottom of the support platform 4 is started, and the air source is delivered to the air receiving pipe 632 through the lower pipe 633. After being diverted by the air receiving pipe 632, the air is sprayed out from the air outlet 631 on the side wall of the inner support 62. The sprayed gas passes through the connecting groove 65 on the extrusion ring 64 and blows towards the contact area between the pressure roller mechanism 6 and the forming ring mold 7 and the forming hole of the forming ring mold 7, blowing off the residual wood chips and impurities, and realizing the automatic cleaning process.

[0026] Please see Figures 3-4 and Figures 7-8The auxiliary cutting mechanism 8 includes a guide groove 81 formed on the top of the inner wall of the support shell 3. The guide groove 81 includes two support sections 811 and two arc-shaped sections 812 that are connected to the support sections 811 at both ends. Multiple cutting rings 82 are slidably connected to the outer wall of the forming ring mold 7. Each cutting ring 82 corresponds to each row of forming holes in the forming ring mold 7. The cutting rings 82 are all fixed to the connecting strip 83. A protrusion on one side of the top of the connecting strip 83 is slidably connected to a slide rail formed on the top of the outer wall of the forming ring mold 7, so that multiple cutting rings 82 can slide up and down synchronously along the outer wall of the forming ring mold 7. A spherical protrusion 84 is provided on the upper part of the mold. The protrusion 84 is slidably connected in the guide groove 81. When the protrusion 84 slides in the support section 811, the cutting ring 82 is located above the forming hole. When the protrusion 84 slides to the arc section 812, it will drive the entire connecting strip 83 and the cutting ring 82 to slide downwards along the slide opened at the top of the outer wall of the forming ring mold 7, and then slide upwards until the protrusion 84 disengages from the arc section 812 and runs back to the support section 811, realizing the intermittent cutting of the material on the outer wall of the forming hole. The protrusion 84 rotates continuously with the forming ring mold 7, and in the process, it moves in the guide groove 81. Synchronous sliding occurs within the guide groove 81. When the protrusion 84 slides within the support section 811 of the guide groove 81, the cutting ring 82 remains above the forming hole, not contacting the extruded material and not interfering with normal material extrusion. When the protrusion 84 slides to the arc-shaped section 812 of the guide groove 81, the curved surface structure of the arc-shaped section 812 exerts a downward and then upward guiding force on the spherical protrusion 84, forcing the protrusion 84 to slide along the curved surface trajectory of the arc-shaped section 812. This, in turn, drives the entire connecting strip 83 to reciprocate up and down along the slide, i.e., first sliding downwards, simultaneously driving all the cutting rings 82 to move downwards, and then moving them to the outside of the forming hole. The extruded material contacts the material, completing one cutting action. It then continues to slide along the arc-shaped section 812, causing the connecting strip 83 and the cutting ring 82 to slide upwards and return to the position above the forming hole until the protrusion 84 disengages from the arc-shaped section 812 and re-enters the support section 811, at which point the cutting action stops. This cycle repeats, with the protrusion 84 sliding alternately between the support section 811 and the arc-shaped section 812, causing the cutting ring 82 to perform intermittent up-and-down reciprocating motion. Ultimately, this achieves intermittent cutting of the extruded material on the outer wall of the forming hole, avoiding the generation of non-compliant particles due to material residue and ensuring particle size consistency.

[0027] It should be noted that, in use, this wood pellet forming machine first synchronously starts the main motor 2 fixedly installed on one side of the top of the lower support 1 and the upper motor 92 in the upper drive mechanism 9. After the main motor 2 is powered on, it drives the transmission column 5 to rotate at a constant speed through belt and roller transmission. Since the transmission column 5 is fixed at the bottom center of the support platform 4, it drives the support platform 4 rotatably connected inside the support shell 3, as well as the pressure roller mechanism 6 and guide block 10 set on the support platform 4 to rotate synchronously. At the same time, the output end of the upper motor 92 drives the fixed upper gear 93 to rotate. The upper gear 93 meshes with the upper gear ring 94 fixedly sleeved on the top of the forming ring die 7, thereby driving the forming ring die 7 rotatably connected to the support shell 3 to rotate at a constant speed. The rotation direction of the forming ring die 7 is opposite to the rotation direction of the support platform 4 and the pressure roller mechanism 6, forming a relative reverse rotation, which provides a stable relative crushing power for the subsequent extrusion forming of wood pellet raw materials until each rotating component reaches the preset speed and runs stably. During the process, the rotation of the support platform 4 drives the pressure roller mechanism 6 to rotate as a whole. The lower gear 636, fixed at the bottom of the inner support 62, revolves synchronously with the support platform 4. Simultaneously, because the lower gear 636 meshes with the lower gear ring 637 fixed to the inner wall of the support shell 3, the lower gear 636 rotates around its own axis while revolving, thereby causing the inner support 62, which is rotatably connected to the outer ring body 61, to rotate synchronously. Initially, the outer ring body 61 remains stationary under the damping action of the damping bearing. As the inner support 62 rotates, the limiting blocks 635, evenly distributed at the bottom of the sidewall of the inner support 62, move within the outer ring body... The inner ring 61 slides continuously within the evenly spaced limiting grooves 634 at the bottom of the inner wall until the limiting block 635 slides to one side of the limiting groove 634 and is limited. After the limiting block 635 is limited, the rotation of the inner support 62 drives the outer ring 61 to rotate synchronously. The inner wall of the extrusion ring 64 completely blocks the air outlet 631 on the side wall of the inner support 62. At the same time, the outer wall of the inner support 62 blocks the elongated connecting groove 65 on the side wall of the extrusion ring 64. The entire extrusion ring 64 and the inner support 62 combine to form a complete pressure roller structure. After the main motor 2 and upper motor 92 have stabilized and the rotation speeds of each rotating component have reached preset values, the pre-treated wood chips are fed into the equipment through the feed shell 12 located on the other side of the top of the mounting shell 91. Since the feed shell 12 is located directly above the pressure roller mechanism 6, the wood chips fall directly onto the top of the support platform 4. Furthermore, because a guide block 10 is located at the center of the top of the support platform 4, and the top of the guide block 10 is an arc-shaped dome, it effectively prevents the wood chips from accumulating at the center of the top of the support platform 4. As the support platform 4 continues to rotate, the wood chips are evenly dispersed to the top edge of the support platform 4 under the guidance of centrifugal force and the arc-shaped surface of the guide block 10, and precisely conveyed to the extrusion area between the pressure roller mechanism 6 and the forming ring die 7, where they are extruded and formed. During the pelleting process, the pressure roller mechanism 6 rotates in the opposite direction with the support platform 4, while the forming ring die 7 rotates synchronously in the forward direction. A continuous and stable crushing and extruding force is formed between the two, which crushes and extrudes the wood chips conveyed to the extrusion area. Under the strong crushing and extruding force, the wood chips are forcibly squeezed into the forming holes evenly opened on the side wall of the forming ring die 7. Under the constraint of the forming holes, the wood chips are gradually squeezed and compacted to form columnar particles that match the shape and size of the forming holes. Under the continuous extrusion force, the columnar particles are slowly squeezed out from the outer orifice of the forming ring die 7, completing the initial pelleting. At the same time, the forming ring die 7 and the pressure roller mechanism 6, which rotate in opposite directions, have a self-cutting effect, which can initially cut the formed wood chips from the inner wall of the forming ring die 7. As the forming ring die 7 continues to rotate, the protrusion 84 rotates synchronously with the forming ring die 7 and slides synchronously within the guide groove 81. When the protrusion 84 slides within the support section 811 of the guide groove 81, the cutting ring 82 remains above the forming hole, does not contact the extruded material, and does not interfere with the normal extrusion of the material. When the protrusion 84 slides to the arc-shaped section 812 of the guide groove 81, the curved surface structure of the arc-shaped section 812 exerts a downward and then upward guiding force on the spherical protrusion 84, forcing the protrusion 84 to move along... The curved surface of the arc segment 812 slides, causing the entire connecting strip 83 to reciprocate up and down along the slide rail. Simultaneously, all cutting rings 82 move downwards to contact the material extruded from the outside of the forming hole, completing one cutting action. Then, it continues to slide along the arc segment 812, causing the connecting strip 83 and cutting rings 82 to slide upwards, returning to their position above the forming hole, until the protrusion 84 disengages from the arc segment 812 and re-enters the support segment 811, at which point the cutting action stops. This cycle repeats, with the protrusion 84 resting on the support segment 811. The support section 811 and the arc section 812 slide alternately, driving the cutting ring 82 to perform intermittent up-and-down reciprocating motion, thereby intermittently cutting the material extruded from the outer wall of the forming hole. This effectively prevents some wood chips from remaining on the outside of the forming ring die 7 and being unable to come out, avoiding the residual wood chips from being squeezed and spliced ​​into long strips of non-compliant particles, and ensuring the size consistency and compliance of the produced particles. The qualified wood chips cut by the auxiliary cutting mechanism 8 fall onto the discharge impeller 13 fixed at the bottom of the forming ring die 7 under its own gravity. The bottom of the discharge impeller 13 is provided with an annular protrusion, which is rotatably connected to the annular groove opened at the top of the support platform 4, ensuring the stability of the discharge impeller 13 when rotating synchronously with the forming ring die 7. During the rotation of the discharge impeller 13, the falling wood chips are evenly guided to the through groove opened on the side wall of the support shell 3. The wood chips enter the discharge hopper 11 set on the side wall of the support shell 3 through the through groove, and are finally discharged from the equipment through the discharge hopper 11, completing the entire wood chip forming and discharge process. When the pelleting process is completed and the pressure roller mechanism 6 and forming ring die 7 need to be cleaned, first stop feeding wood chips into the feed shell 12. After all the remaining wood chips in the equipment have been extruded and discharged, switch both the main motor 2 and the upper motor 92 in the upper drive mechanism 9 to reverse drive mode. When the main motor 2 reverses drive, it drives the transmission column 5, support platform 4 and pressure roller mechanism 6 to rotate in the opposite direction. The lower gear 636 at the bottom of the inner support 62 revolves in the opposite direction with the support platform 4. At the same time, under the meshing action of the lower gear ring 637, the lower gear 636 rotates in the opposite direction around its own axis, driving the inner support 62 to rotate in the opposite direction. During the reverse rotation of the inner support 62, the limiting block 635 at the bottom of its side wall slides in the opposite direction along the limiting groove 634 at the bottom of the inner wall of the outer ring body 61 until the limiting block 635 slides. The compression ring 64 moves to the other side of the limiting groove 634 and is limited. After being limited, the compression ring 64 moves synchronously in the opposite direction with the inner support 62 and the outer ring body 61 under the drive of the limiting block 635. After being limited, the connecting groove 65 on the compression ring 64 corresponds to and is fully connected with the air outlet 631 on the side wall of the inner support 62. The reverse blowing mechanism 63 enters the working state and starts the air pump fixed at the bottom of the support platform 4. The air source is delivered to the air receiving pipe 632 fixedly connected in the inner support 62 through the lower pipe 633. After being diverted by the air receiving pipe 632, the air is sprayed out from the air outlet 631 on the side wall of the inner support 62. The sprayed gas passes through the connecting groove 65 on the compression ring 64 and blows towards the contact area between the pressure roller mechanism 6 and the forming ring mold 7 and the forming hole of the forming ring mold 7, blowing off the residual wood chips and impurities, realizing the automatic cleaning process of the equipment.

[0028] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A wood pellet forming machine, comprising a lower support (1), characterized in that: The top of the lower support (1) is fixed with a support shell (3), the lower support (1) is fixed with a main motor (2), the support shell (3) is rotatably connected with a support platform (4), the output end of the main motor (2) is connected to the transmission column (5) at the bottom of the support platform (4) through a belt roller, the support platform (4) is provided with a pressure roller mechanism (6), and the support shell (3) is rotatably connected with a forming ring mold (7), the forming ring mold (7) is connected with an upper drive mechanism (9), and the forming ring mold (7) is provided with an auxiliary cutting mechanism (8); the pressure roller mechanism (6) includes an outer ring body (61) rotatably connected to the support platform (4) through a damping bearing, an inner support (62) rotatably connected in the outer ring body (61), a reverse blowing mechanism (63) is provided on the inner support (62), and an extrusion ring (64) rotatably connected to the outside of the inner support (62), a long strip-shaped connecting groove (65) is opened on the side wall of the extrusion ring (64), and the bottom of the extrusion ring (64) is fixed to the outer On the ring body (61); the reverse blowing mechanism (63) includes an air outlet (631) opened on the side wall of the inner support (62), and an air inlet pipe (632) is fixedly connected in the inner support (62). The air inlet pipe (632) and the air outlet (631) are interconnected. The bottom end of the air inlet pipe (632) is rotatably connected to a lower pipe (633) for connecting to the air source; the auxiliary cutting mechanism (8) includes a guide groove (81) opened on the top of the inner wall of the support shell (3). The guide groove (81) includes a support section (811) and an arc-shaped section (812) with both ends connected to the support section (811). Multiple cutting rings (82) are slidably connected to the outer wall of the forming ring mold (7). The cutting rings (82) are all fixed on the connecting strip (83). The top of one side of the connecting strip (83) is slidably connected to the slide in the top of the outer wall of the forming ring mold (7). The connecting strip (83) is provided with a protrusion (84) slidably connected to the guide groove (81).

2. The wood pellet forming machine according to claim 1, characterized in that: The inner wall of the outer ring (61) is uniformly provided with a limiting groove (634), and the bottom of the side wall of the inner support (62) is uniformly provided with a limiting block (635) that is slidably connected in the limiting groove (634). The bottom of the inner support (62) is fixed with a lower gear (636), and the inner wall of the support shell (3) is fixed with a lower gear ring (637) that meshes with the lower gear (636).

3. The wood pellet forming machine according to claim 1, characterized in that: The upper drive mechanism (9) includes a mounting shell (91) fixed to the top of the support shell (3), an upper motor (92) is fixedly installed on one side of the top of the mounting shell (91), and a feed shell (12) is provided on the other side of the top of the mounting shell (91).

4. A wood pellet forming machine according to claim 3, characterized in that: The output end of the upper motor (92) is fixed with an upper gear (93) through the mounting shell (91), and an upper gear ring (94) is meshed on the upper gear (93) and fixedly sleeved on the top of the forming ring mold (7).

5. A wood pellet forming machine according to claim 1, characterized in that: The bottom of the forming ring die (7) is fixed with a discharge impeller (13), the bottom of which is rotatably connected to the support platform (4), and a guide block (10) is provided at the top center of the support platform (4).

6. A wood pellet forming machine according to claim 1, characterized in that: The side wall of the support shell (3) is provided with a discharge hopper (11), and a through groove is provided at the connection between the support shell (3) and the discharge hopper (11).

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