Biomass pellet fuel processing equipment and processing method thereof

Abstract

The application discloses a kind of biomass pellet fuel processing equipment and its processing method, belong to biomass pellet fuel technical field, equipment includes screening pretreatment unit, chipper, bunker, poking device and pulverizer connected in sequence;Screening pretreatment unit contains upper layer vibration type grid plate and lower layer multiple strong magnetic suction roller, realize raw material screening and metal impurity removal integration;The poking tooth of poking device adopts tungsten carbide wear-resistant head and steel matrix composite structure, by bolt quick-release connection and included angle adjustable, cooperate variable frequency motor drive and realize uniform speed feeding;Pulverizer is equipped with two-stage crushing assembly, by chain drive driving.Processing method includes raw material pretreatment, cutting, quantitative feeding and grading crushing steps, by vibrating screen, magnetic attraction impurity removal, angle adaptation poking, gradient crushing complete processing.The application solves the problems of low pretreatment efficiency, easy to be damaged, poor feeding adaptation and insufficient crushing qualification rate of existing equipment, improves the overall processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of biomass pellet fuel technology, and in particular to a biomass pellet fuel processing equipment and processing method. Background Technology

[0002] Biomass pellet fuel, as a clean and environmentally friendly renewable energy source, plays a significant role in alleviating energy shortages and reducing environmental pollution. Currently, biomass pellet fuel processing mainly uses branches, trunks, and furniture factory scraps as raw materials. However, these raw materials suffer from significant variations in morphology, high impurity content (especially metal impurities such as nails and screws mixed in with furniture scraps), and poor processing adaptability, posing numerous challenges to the stable operation of subsequent processing equipment and product quality.

[0003] In the raw material pretreatment stage, existing equipment often separates screening and impurity removal, resulting in a cumbersome and inefficient process. Furthermore, the screening is mostly static, making it difficult to quickly separate raw materials that do not meet processing dimensions. The removal of metallic impurities also relies heavily on manual sorting or a single magnetic suction structure, leading to incomplete impurity removal and causing blade wear, shaft jamming, or even damage to subsequent chippers and crushers. In the feeding stage, traditional devices typically transport materials directly to the crusher via gravity from a hopper, easily causing blockages at the crusher's inlet and reducing crushing efficiency. In the crushing stage, most equipment uses single-stage crushing, making it difficult to achieve gradient crushing of raw materials. This often results in uneven particle size and low pass rates, affecting the quality of subsequent particle forming.

[0004] In response to the aforementioned problems such as low pretreatment efficiency, easy equipment damage, easy blockage during the feeding stage, and insufficient crushing qualification rate, there is an urgent need for an integrated and efficient biomass pellet fuel processing equipment to optimize the processing flow, improve equipment stability, and enhance product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a biomass pellet fuel processing equipment and processing method to solve the above-mentioned problems.

[0006] This invention provides a biomass pellet fuel processing device, comprising a chipper, a hopper, a feeding device, and a pulverizer connected in sequence;

[0007] The chipper is equipped with a screening pretreatment unit at its feed end. The screening pretreatment unit includes an upper vibrating grid plate and a lower strong magnetic suction roller. The grid plate is driven by a drive device to achieve vibrating screening. The strong magnetic suction roller is used to adsorb metal impurities in the raw material and transport the raw material to the chipper. The chipper is equipped with a conveyor belt at its outlet end. The raw material is chipped by the chipper and then transported to the feed inlet of the hopper via the conveyor belt.

[0008] The bottom of the hopper is inclined, and the feeding device is arranged on its discharge side. The feeding device includes a feeding spindle and feeding teeth on the spindle. The feeding teeth adopt a composite structure of tungsten carbide wear-resistant head and steel substrate, and are connected to the feeding spindle by bolts. The included angle between the feeding teeth and the feeding spindle is adjustable. The feeding spindle is connected to a variable frequency motor through a chain drive mechanism. The discharge end of the hopper is provided with a conveyor belt that connects to the feed inlet of the crusher.

[0009] The pulverizer includes a first-stage pulverizing component and a second-stage pulverizing component arranged vertically. Both the first-stage and second-stage pulverizing components consist of a pulverizing shaft and pulverizing blades. The pulverizing blade density of the second-stage pulverizing component is greater than that of the first-stage pulverizing component. The pulverizing shaft is connected to a drive motor through a chain drive mechanism.

[0010] Preferably, in the above-mentioned biomass pellet fuel processing equipment, the driving device for the grid plate is a telescopic cylinder, and the piston rod of the telescopic cylinder is hinged to the grid plate, and the grid plate vibrates by reciprocating extension and retraction of the piston rod.

[0011] Preferably, in the above-mentioned biomass pellet fuel processing equipment, at least two strong magnetic suction rollers are provided along the raw material conveying direction, and the roller surface is provided with permanent magnets.

[0012] Preferably, in the above-mentioned biomass pellet fuel processing equipment, the chain drive mechanism includes a drive wheel, a chain, and a driven wheel. One end of the feeding main shaft of the feeding device is provided with a driven wheel. The output end of the variable frequency motor is connected to the drive wheel. The chain is sleeved on the drive wheel and the driven wheel. The crushing shafts of the first-stage crushing component and the second-stage crushing component are respectively connected to driven wheels. The output ends of the drive motors of the first-stage crushing component and the second-stage crushing component are respectively connected to drive wheels. The chain is sleeved on the corresponding drive wheel and driven wheel.

[0013] Preferably, in the above-mentioned biomass pellet fuel processing equipment, the feeding spindle is provided with a mounting seat with a threaded hole, and the steel base of the feeding teeth is provided with a corresponding through hole, and the bolt passes through the through hole and is threadedly connected to the mounting seat.

[0014] Preferably, in the above-mentioned biomass pellet fuel processing equipment, the angle between the feeding teeth and the feeding spindle is adjustable from 15° to 45°, and the angle is fixed by bolts located between the feeding teeth and the mounting base.

[0015] Preferably, in the above-mentioned biomass pellet fuel processing equipment, the blade spacing of the second-stage crushing component is 1 / 3 to 1 / 2 of that of the first-stage crushing component.

[0016] A processing method for the biomass pellet fuel processing equipment as described above is provided, comprising the following steps:

[0017] Biomass raw materials such as branches, trunks, large wood blocks and furniture factory scraps are fed into the screening and pre-treatment unit. The telescopic cylinder is activated to drive the grid plate to vibrate, screening out qualified raw materials with a particle size smaller than the gap between the grid plates. The qualified raw materials fall to the strong magnetic suction roller. During the transportation process, the strong magnetic suction roller adsorbs and removes metal impurities such as iron nails and screws. At the same time, the raw materials are transported by the strong magnetic suction roller to the feed port of the chipper.

[0018] The chipper starts up and cuts the pre-treated raw material into small pieces with a length of less than 15 cm. The small pieces are then conveyed to the hopper by a conveyor belt.

[0019] According to the subsequent crushing requirements and the type of raw materials, adjust the angle between the feeding teeth and the feeding spindle, start the variable frequency motor to drive the feeding spindle to rotate, and push the small pieces of raw materials that slide down the inclined bottom of the hopper by gravity through the feeding teeth to the second conveyor belt at a uniform speed, and then enter the feed inlet of the crusher.

[0020] The drive motor is started, and the crushing shafts of the first-stage crushing component and the second-stage crushing component are driven to rotate through the chain transmission mechanism. The raw material first enters the first-stage crushing component and is initially crushed by the crushing blades. The crushed material falls into the second-stage crushing component below under the action of gravity for secondary crushing, so as to obtain crushed material that meets the requirements of biomass pellet fuel processing.

[0021] Therefore, this invention employs the aforementioned biomass pellet fuel processing equipment and method. By integrating a vibrating grid plate and a strong magnetic roller into a screening pretreatment unit at the feed end of the chipper, it achieves integrated operation of raw material screening and metal impurity removal. The grid plate is driven to vibrate by a drive device, which can quickly screen out raw materials that meet the cutting size, improving efficiency compared to static screening. Multiple strong magnetic rollers are arranged along the conveying direction in the lower layer, which can comprehensively adsorb metal impurities in the raw materials, effectively avoiding problems such as blade wear and shaft jamming caused by metal impurities entering the chipper and pulverizer, thus extending the service life of the equipment.

[0022] The feeding teeth adopt a composite structure of tungsten carbide wear-resistant head and steel matrix, which improves wear resistance and life compared with traditional steel feeding teeth. The teeth are connected to the feeding spindle mounting base by bolts, allowing for quick replacement of individual teeth without disassembling the spindle, significantly improving maintenance efficiency. Furthermore, the angle between the feeding teeth and the spindle can be adjusted within the range of 15°-45°, adapting the feeding angle to the physical characteristics of different raw materials such as branches, wood blocks, and scraps. Combined with a chain drive mechanism driven by a variable frequency motor, the feeding rate can be precisely controlled, ensuring that the raw materials enter the crusher at a uniform speed, solving the problem of feed inlet blockage caused by rate fluctuations or unsuitable angles in traditional feeding methods.

[0023] The crusher employs a gradient design with two-stage crushing components, and the spacing between the second-stage crushing blades is 1 / 3 to 1 / 2 of that of the first stage. The raw material undergoes initial crushing in the first-stage component, followed by fine crushing in the second stage, achieving orderly processing of coarse and fine crushing. This structure reduces particle size deviation and improves the yield rate. Compared to single-stage crushing equipment, particle size uniformity is significantly improved, providing high-quality raw materials for subsequent particle forming.

[0024] The equipment achieves seamless material transfer between the chipper, hopper, and crusher via conveyor belts one and two. Combined with the gravity feeding design at the inclined bottom of the hopper, it forms a continuous processing flow of pretreatment-chipping-feeding-crushing. Each unit is driven by a chain drive mechanism, resulting in high transmission efficiency and stable operation. Compared to traditional equipment, the overall processing efficiency is improved, and the high degree of automation reduces manual intervention and labor intensity.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a biomass pellet fuel processing device according to the present invention;

[0027] Figure 2 This is a cross-sectional view of the overall structure of a biomass pellet fuel processing device according to the present invention. Detailed Implementation

[0028] To better understand the above technical solutions, a detailed description of the solutions will be provided below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0030] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0031] like Figure 1-2 As shown, the biomass pellet fuel processing equipment includes a screening and pretreatment unit 1, a chipper 2, a hopper 3, a feeding device 4, and a crusher 5 connected in sequence. Each unit achieves continuous material transmission through a conveyor belt or direct connection.

[0032] The screening pretreatment unit 1 is located at the feed end of the chipper 2. Its outer shell is made of stainless steel. Inside, along the raw material conveying direction, an upper vibrating grid plate 11 and a lower strong magnetic suction roller 12 are arranged in sequence, and a feed port is provided at the top.

[0033] The grid plate 11 is connected to the outer shell of the screening pretreatment unit on both sides by spring hinges, and its middle position on one side is hinged to the piston rod of the telescopic cylinder 13. The reciprocating extension and retraction of the piston rod drives the grid plate 11 to vibrate left and right along the spring hinge, thereby realizing the dynamic screening of raw materials.

[0034] The strong magnetic suction roller 12 is arranged parallel to the material conveying direction. The length of the roller body is adapted to the width of the grid plate 11. The roller surface is covered with a wear-resistant stainless steel layer, and neodymium iron boron permanent magnets are embedded inside. The two ends of the strong magnetic suction roller 12 are fixed to the unit shell through bearing seats. It is driven by a geared motor and can efficiently attract metal impurities such as iron nails and screws.

[0035] Chipper 2 can cut raw materials into small pieces less than 15cm in length. A conveyor belt 6 is installed below the outlet end of chipper 2. The conveyor belt 6 is driven by a motor and its end extends to the feed inlet of hopper 3 to realize the transfer of small pieces of raw materials after chipping.

[0036] The hopper 3 is made of welded steel structure with a bottom inclination angle of 30°-45° to ensure that the raw materials can slide down by gravity. The discharge end of the hopper 3 is provided with a rectangular opening.

[0037] The feeding device 4 includes a feeding spindle 41, feeding teeth 42, a variable frequency motor 43, and a chain drive mechanism 44. The length of the feeding spindle 41 is adapted to the width of the material outlet of the hopper. Multiple sets of mounting seats are evenly distributed along the axial direction on the spindle, and the mounting seats are provided with threaded holes. The feeding teeth 42 are made of tungsten carbide wear-resistant heads welded to a steel base. The end of the steel base has a waist-shaped through hole adapted to the mounting seat, and is connected to the mounting seat by high-strength bolts. The included angle between the feeding teeth 42 and the feeding spindle 41 is fixed within the range of 15°-45° by adjusting bolts, with an adjustment accuracy of 5°.

[0038] The chain drive mechanism 44 includes a drive wheel 441, a driven wheel 442 and a chain 443. The drive wheel is connected to the output shaft of the variable frequency motor 43, and the driven wheel is fixed to the end of the feeding spindle 41. The speed of the feeding spindle 41 is controlled by the chain drive.

[0039] A second conveyor belt 7 is installed below the discharge end of the hopper 3, and its end is connected to the feed inlet of the crusher 5.

[0040] The crusher 5 has a vertical double-layer structure. The upper layer is equipped with a first-stage crushing component 51, and the lower layer is equipped with a second-stage crushing component 52. The two are connected by a material discharge channel.

[0041] The first-stage crushing component 51 includes a crushing shaft 511 and multiple sets of crushing blades 512 evenly distributed along the circumference of the shaft. The distance between adjacent blades is 20-30mm, and the rotation speed of the crushing shaft is controlled by a chain drive mechanism.

[0042] The second-stage crushing component 52 has a similar structure to the first stage, except that the spacing between the crushing blades is 5-10mm, which is 1 / 3-1 / 2 of the spacing in the first stage.

[0043] Both stages of the crushing assembly include a drive wheel connected to the output shaft of the drive motor, a driven wheel connected to the crushing shaft, and a chain.

[0044] The specific method for processing biomass pellet fuel based on the above-mentioned equipment is as follows:

[0045] Raw materials such as branches, trunks, and furniture factory scraps are fed into the screening and pre-treatment unit 1. The telescopic cylinder 13 is activated to vibrate the grid plate 11, screening out qualified raw materials. The qualified raw materials fall onto the strong magnetic suction roller 12, where the permanent magnet on the roller surface attracts metallic impurities. The impurity-removed raw materials are then conveyed to the feed inlet of the chipper 2. The chipper 2 is started, cutting the raw materials into small pieces less than 15cm in size. These small pieces are conveyed to the hopper 3 via conveyor belt 6. Based on the fact that the raw material is wood blocks, the angle between the feeding teeth 42 and the main shaft is adjusted to 30°. The variable frequency motor 43 is started to rotate the feeding main shaft 41. The feeding teeth 42 push the raw materials in the hopper 3 at a uniform speed to the conveyor belt 7, which then feeds them into the crusher 5. The drive motor is started, and the first-stage crushing component 51 initially crushes the raw materials. The materials then fall into the second-stage crushing component 52 for secondary crushing, obtaining crushed materials that meet the requirements.

[0046] Equipment operation process: Based on the biomass pellet fuel processing method of the above equipment, the entire process from raw material input to qualified crushed material output is automated through the coordinated operation of each unit. The specific steps and operation details are as follows:

[0047] (1) Raw material input and pretreatment stage

[0048] Raw material input: Biomass raw materials such as branches, trunks, large wood blocks, and furniture factory scraps are fed into the feed hopper of the screening and pretreatment unit 1 at a uniform speed by manual labor or a feeding conveyor belt to avoid raw material accumulation and blockage. The raw materials fall from the feed hopper into the upper grid plate 11. The telescopic cylinder 13 is activated, and the piston rod reciprocates, causing the grid plate 11 to vibrate up and down along the spring hinge. Qualified raw materials smaller than the grid gap fall quickly to the lower conveying channel under the action of vibration.

[0049] After the qualified raw materials fall into the lower layer, they are received by the strong magnetic suction roller 12, which rotates along the conveying direction. The strong magnetic suction roller 12 is driven by a geared motor, and the permanent magnets on the roller surface generate a strong attraction force on the metal impurities such as iron nails, screws, and iron pieces in the raw materials, and the impurities are firmly attracted to the roller surface. The impurity-removed raw materials are conveyed to the end via the strong magnetic suction roller 12 and accurately conveyed to the feed port of the chipper 2.

[0050] (2) Raw material cutting stage

[0051] After the chipper 2 starts, it processes the raw material into small pieces less than 15cm through rotational cutting. The chopped raw material is discharged from the outlet of the chipper 2 and falls onto the conveyor belt 6 below. The conveyor belt 6 is driven by a motor and its conveying speed is matched to the discharge speed of the chipper 2 to ensure that the small pieces of raw material are evenly distributed on the conveyor belt and avoid local accumulation. The end of the conveyor belt 6 connects to the inlet of the hopper 3, and the raw material slides into the hopper 3 through the inlet. The 35° inclination angle at the bottom of the hopper 3 ensures that the raw material can slowly slide towards the discharge end by gravity.

[0052] (3) Quantitative and uniform feeding stage

[0053] The feeding angle adjustment adjusts the angle between the feeding teeth 42 and the feeding main shaft 41 according to the type of raw material. For denser wood blocks, such as hardwood, the angle is adjusted to 30° to increase the feeding force; for lightweight branch materials, it is adjusted to 20° to reduce feeding resistance. During adjustment, first loosen the locking bolts between the steel base of the feeding teeth 42 and the mounting base, rotate the feeding teeth to the target angle, and then tighten the adjusting bolts to fix the angle. Start the variable frequency motor 43, which drives the feeding main shaft 41 to rotate through the chain drive mechanism 44. As the feeding teeth 42 rotate with the main shaft, the tungsten carbide wear-resistant head pushes the raw material towards the conveyor belt 7. Because the feeding teeth 42 are evenly distributed along the main shaft axis and have a stable rotation speed, a constant feeding rate can be ensured. The conveyor belt 7 receives the raw material pushed by the feeding device 4 and finally smoothly feeds the raw material into the feed inlet of the crusher 5.

[0054] (4) Grading and crushing stage

[0055] First-stage preliminary crushing: The raw material falls from the buffer hopper into the first-stage crushing component 51 on the upper layer of the crusher 5. The first-stage crushing shaft rotates, and the raw material is initially crushed under the high-speed shearing and impact of the crushing blades. The larger particles are cut again by the blades until the particles with a diameter ≤5mm fall into the lower material discharge channel through the gap between the blades.

[0056] Second-stage fine grinding: The material after preliminary grinding enters the lower-level second-stage grinding component 52 through the feed channel. The second-stage grinding shaft rotates. The material is further sheared and ground by the denser blades, eventually forming pulverized material with a particle size of 0.5-2mm, which meets the requirements for biomass pellet fuel processing.

[0057] Therefore, this invention employs the aforementioned biomass pellet fuel processing equipment and method. By integrating a vibrating grid plate and a strong magnetic roller into a screening pretreatment unit at the feed end of the chipper, it achieves integrated operation of raw material screening and metal impurity removal. The grid plate is driven to vibrate by a drive device, which can quickly screen out raw materials that meet the cutting size, improving efficiency compared to static screening. Multiple strong magnetic rollers are arranged along the conveying direction in the lower layer, which can comprehensively adsorb metal impurities in the raw materials, effectively avoiding problems such as blade wear and shaft jamming caused by metal impurities entering the chipper and pulverizer, thus extending the service life of the equipment.

[0058] The feeding teeth adopt a composite structure of tungsten carbide wear-resistant head and steel matrix, which improves wear resistance and life compared with traditional steel feeding teeth. The teeth are connected to the feeding spindle mounting base by bolts, allowing for quick replacement of individual teeth without disassembling the spindle, significantly improving maintenance efficiency. Furthermore, the angle between the feeding teeth and the spindle can be adjusted within the range of 15°-45°, adapting the feeding angle to the physical characteristics of different raw materials such as branches, wood blocks, and scraps. Combined with a chain drive mechanism driven by a variable frequency motor, the feeding rate can be precisely controlled, ensuring that the raw materials enter the crusher at a uniform speed, solving the problem of feed inlet blockage caused by rate fluctuations or unsuitable angles in traditional feeding methods.

[0059] The crusher employs a gradient design with two-stage crushing components, and the spacing between the second-stage crushing blades is 1 / 3 to 1 / 2 of that of the first stage. The raw material undergoes initial crushing in the first-stage component, followed by fine crushing in the second stage, achieving orderly processing of coarse and fine crushing. This structure reduces particle size deviation and improves the yield rate. Compared to single-stage crushing equipment, particle size uniformity is significantly improved, providing high-quality raw materials for subsequent particle forming.

[0060] The equipment achieves seamless material transfer between the chipper, hopper, and crusher via conveyor belts one and two. Combined with the gravity feeding design at the inclined bottom of the hopper, it forms a continuous processing flow of pretreatment-chipping-feeding-crushing. Each unit is driven by a chain drive mechanism, resulting in high transmission efficiency and stable operation. Compared to traditional equipment, the overall processing efficiency is improved, and the high degree of automation reduces manual intervention and labor intensity.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A biomass pellet fuel processing device, characterized in that, It includes a chipper, a hopper, a feeding device, and a pulverizer connected in sequence; The chipper is equipped with a screening pretreatment unit at its feed end. The screening pretreatment unit includes an upper vibrating grid plate and a lower strong magnetic suction roller. The grid plate is driven by a drive device to achieve vibratory screening. The strong magnetic suction roller is used to adsorb metal impurities in the raw material and convey the raw material to the chipper. The chipper is equipped with a conveyor belt at its outlet end. The raw material is chipped by the chipper and then conveyed to the feed inlet of the hopper via the conveyor belt. At least two strong magnetic suction rollers are provided along the raw material conveying direction, and the roller surface is equipped with permanent magnets. The bottom of the hopper is inclined, and the feeding device is arranged on its discharge side. The feeding device includes a feeding spindle and feeding teeth on the spindle. The feeding teeth adopt a composite structure of tungsten carbide wear-resistant head and steel substrate, and are connected to the feeding spindle by bolts. The included angle between the feeding teeth and the feeding spindle is adjustable. The feeding spindle is connected to a variable frequency motor through a chain drive mechanism. The discharge end of the hopper is provided with a conveyor belt that connects to the feed inlet of the crusher. The included angle between the feeding teeth and the feeding spindle is adjustable from 15° to 45°, and the angle is fixed by bolts between the feeding teeth and the mounting base. The pulverizer includes a first-stage pulverizing component and a second-stage pulverizing component arranged vertically. Both the first-stage and second-stage pulverizing components consist of a pulverizing shaft and pulverizing blades. The pulverizing blade density of the second-stage pulverizing component is greater than that of the first-stage pulverizing component. The pulverizing shaft is connected to a drive motor via a chain drive mechanism. The spacing between the pulverizing blades of the second-stage pulverizing component is 1 / 3 to 1 / 2 of that of the first-stage pulverizing component.

2. The biomass pellet fuel processing equipment according to claim 1, characterized in that, The driving device for the grid plate is a telescopic cylinder. The piston rod of the telescopic cylinder is hinged to the grid plate, and the grid plate vibrates by reciprocating the extension and retraction of the piston rod.

3. The biomass pellet fuel processing equipment according to claim 1, characterized in that, The chain drive mechanism includes a drive wheel, a chain, and a driven wheel. One end of the feeding spindle of the feeding device is provided with a driven wheel. The output end of the variable frequency motor is connected to the drive wheel. The chain is sleeved on the drive wheel and the driven wheel. The crushing shafts of the first-stage crushing component and the second-stage crushing component are respectively connected to driven wheels. The output ends of the drive motors of the first-stage crushing component and the second-stage crushing component are respectively connected to drive wheels. The chain is sleeved on the corresponding drive wheel and driven wheel.

4. The biomass pellet fuel processing equipment according to claim 1, characterized in that, The feeding spindle is equipped with a mounting base with a threaded hole, and the steel base of the feeding teeth is provided with corresponding through holes. Bolts pass through the through holes and are threadedly connected to the mounting base.

5. A processing method based on the biomass pellet fuel processing equipment according to any one of claims 1-4, characterized in that, Includes the following steps: Biomass raw materials such as branches, trunks, large wood blocks and furniture factory scraps are fed into the screening and pre-treatment unit. The telescopic cylinder is activated to drive the grid plate to vibrate, screening out qualified raw materials with a particle size smaller than the gap between the grid plates. The qualified raw materials fall to the strong magnetic suction roller. During the transportation process, the strong magnetic suction roller adsorbs and removes metal impurities such as iron nails and screws. At the same time, the raw materials are transported by the strong magnetic suction roller to the feed port of the chipper. The chipper starts up and cuts the pre-treated raw material into small pieces with a length of less than 15 cm. The small pieces are then conveyed to the hopper by a conveyor belt. According to the subsequent crushing requirements and the type of raw materials, adjust the angle between the feeding teeth and the feeding spindle, start the variable frequency motor to drive the feeding spindle to rotate, and push the small pieces of raw materials that slide down the inclined bottom of the hopper by gravity through the feeding teeth to the second conveyor belt at a uniform speed, and then enter the feed inlet of the crusher. The drive motor is started, and the crushing shafts of the first-stage crushing component and the second-stage crushing component are driven to rotate through the chain transmission mechanism. The raw material first enters the first-stage crushing component and is initially crushed by the crushing blades. The crushed material falls into the second-stage crushing component below under the action of gravity for secondary crushing, so as to obtain crushed material that meets the requirements of biomass pellet fuel processing.

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