Fiber flying-edge cutting device, and wood fiber micro-nano crushing device and system of fiber flying-edge cutting device

Abstract

The fiber flying-edge cutting device comprises a wood fiber micro-nano crushing device and system of the fiber flying-edge cutting device, the fiber flying-edge cutting device comprises a grading wheel and a flexible cutter bundle, a plurality of feeding gaps are formed in the side wall of the grading wheel, a plurality of supporting rods are arranged at the two ends of the grading wheel in the circumferential direction of the grading wheel, and the flexible cutter bundle is arranged between the grading wheel and the supporting rods. Each supporting rod is arranged in the radial direction of the grading wheel, and the supporting rods at the two ends are oppositely arranged. Multiple circles of flexible cutter bundles are wound on the supporting rods at the two ends in the radial direction of the grading wheel from outside to inside, one circle of flexible cutter bundles form a cutter head, the flexible cutter bundles in each circle of flexible cutter bundles are arranged in an angular staggered mode in the circumferential direction, and the adjacent circles of flexible cutter bundles deviate at a preset angle.

Description

Technical Field

[0001] The present invention belongs to the technical field of equipment, and in particular relates to a fiber flying blade cutting device including a wood fiber micro-nano crushing device and a system of the cutting device. Background Art

[0002] Currently, wood fiber is difficult to directly crush into micro- and nano-sized particles due to its rich structure of cellulose and lignin and its strong toughness. Existing wood fiber comminution processes generally use metal blades or hammer-type mechanical structures for multi-stage crushing. This process typically requires the coordinated operation of multiple devices, resulting in complex operations and high energy consumption. Furthermore, frequent material transfers and multiple grinding steps reduce efficiency.

[0003] In addition, traditional metal cutting tools have obvious defects in the process of high-speed cutting of wood fibers: their blades are prone to wear and cracking when continuously impacting wood or mixed hard objects, which not only affects the service life but also may generate metal sparks. In a dry pulverization environment, because lignin is rich in volatile components and has a low ignition point, and a large amount of fine dust particles are generated during the pulverization process, it is very easy to form a combustible dust cloud in a confined space, causing an explosion when encountering a fire source. Therefore, the use of metal cutting tools brings a high safety hazard, especially in scenarios requiring high-speed and high-frequency pulverization operations, the process risks are further amplified. Summary of the Invention

[0004] To address the technical problems of the prior art, the present invention provides a fiber flying blade cutting device, including a wood fiber micro-nano crushing device and system. This device addresses the existing issues of complex crushing processes, fragility of the cutting tools, and low dry crushing efficiency. Through structural optimization and the application of novel fiber cutting tools, the device achieves step-by-step crushing of wood fiber raw materials without the intervention of liquids, producing a fibrous or powdered material with controllable particle size. This device offers the advantages of compact structure, continuous operation, safety, and high efficiency.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In the first aspect, the present invention proposes a fiber flying blade cutting device, comprising a grading wheel and a flexible blade bundle, a plurality of feed gaps are provided on the side wall of the grading wheel, a plurality of support rods are provided at both ends of the grading wheel along its circumferential direction, each support rod is provided along the radial direction of the grading wheel, and the support rods at both ends are provided opposite to each other; and a plurality of circles of flexible blade bundles are wound from the outside to the inside on the support rods at both ends along the radial direction of the grading wheel, and a circle of flexible blade bundles forms a knife disk, and the flexible blade bundles in each circle of flexible blade bundles are arranged at an angle staggered along the circumferential direction, and the flexible blade bundles of adjacent circles are offset at a preset angle. That is, in order to achieve continuity and uniformity in the cutting process, the fiber knife groups are arranged at an angle staggered along the circumferential direction at each knife disk layer, and the adjacent knife groups are offset at a preset angle to avoid synchronous cutting on the same radial line, thereby effectively reducing the load peak, reducing vibration and improving operation stability.

[0006] The device is used for chopping and grinding wood fibers at high speed into micro-nano sized fibrous or powdery products with a desired particle size without the intervention of liquid.

[0007] As a further technical solution, each circle of flexible blade bundles includes two flexible blade bundles, each flexible blade bundle passes through the support rods at both ends in a serpentine manner in sequence, and the two flexible blade bundles form a cross.

[0008] As a further technical solution, the radial distance between adjacent blades decreases from the outside to the inside along the radial direction of the grading wheel. In other words, the spatial arrangement of the fiber blade groups also exhibits a hierarchical change characteristic of "gradually denser from the outer circle to the inner circle": as the cutting position of the blades approaches the center of the circle, the spacing between the fiber blade groups gradually decreases, making the arrangement more compact. This multi-level arrangement, with loose outside and dense inside, enables the cutting process to gradually transition to high-frequency fine crushing after the initial crushing of the raw materials, improving overall cutting accuracy and particle size control.

[0009] As a further technical solution, one end of the classifying wheel is closed and the other end is open.

[0010] As a further technical solution, the flexible blade bundle is composed of a plurality of high-performance fiber filaments bundled side by side.

[0011] In a second aspect, the present invention further provides a wood fiber micro-nano crushing device, comprising the aforementioned fiber flying blade cutting device and feed guide rail device.

[0012] As a further technical solution, the feed guide rail device includes a guide cover, a feed port is arranged at one end of the guide cover, a conical guide rail surface and an inner shell are arranged inside the guide cover, the conical guide rail surface is arranged on one end of the inner shell, a plurality of holes are arranged on the inner shell, and a cutting area is formed inside the inner shell.

[0013] As a further technical solution, the fiber flying blade cutting device is arranged in the cutting area and is coaxial with the inner shell.

[0014] In a third aspect, the present invention further provides a wood fiber micro-nano crushing system, comprising a multi-stage wood fiber micro-nano crushing device and a multi-stage cyclone separator; the cyclone separator is arranged at the rear end of the corresponding wood fiber micro-nano crushing device.

[0015] As a further technical solution, along with the conveying direction of the material, the diameter of the aramid monofilament of the flexible blade bundle of the wood fiber micro-nano crushing device of the previous stage is larger than the diameter of the aramid monofilament of the flexible blade bundle of the wood fiber micro-nano crushing device of the next stage. The beneficial effects of the present invention are as follows: 1) The three-dimensional staggered fiber cutter structure proposed in this invention creates a cutting surface resembling a concentric ring grid, achieving multi-layered, multi-angle synchronous shearing of wood fibers during continuous rotation, significantly enhancing cutting coverage and fiber processing capacity. Furthermore, the flexible blade bundles are arranged in an angularly staggered arrangement along the circumference, with the flexible blade bundles of adjacent circles offset at preset angles. This creates a distinct, multi-layered, staggered cutting surface and prevents overlap of blade bundles along the same cutting path, ensuring a more even distribution of cutting points during rotation. This angularly staggered design allows multiple fiber blade groups to form mutually exclusive shear layers in the longitudinal direction, thereby increasing cutting frequency and overall stability. The high-strength fiber cutters exhibit excellent wear resistance when comminuting wood fibers, with a lifespan far exceeding that of traditional metal blades, reducing the cost and downtime of frequent tool replacement. The flexible fiber cutters operate without generating metal fragments or sparks, reducing equipment damage and the risk of fire. Furthermore, fiber blade bundle replacement is simple, requiring no specialized blade sharpening, making routine maintenance convenient and safe.

[0016] 2. The proposed micro-nano wood fiber crushing device integrates coarse crushing, shearing, and fine grinding into a single device. Material is continuously crushed in different modules on the same spindle, eliminating the need for intermediate transfer. Combined with air feeding, this device enables continuous, streamlined processing of wood fiber, significantly improving crushing efficiency.

[0017] 3. The wood fiber micro-nano crushing system proposed in this invention utilizes a graded and combined design, ensuring precise control of particle size. The final discharge particle size is uniform and adjustable, and the screen aperture can be changed as needed to obtain wood fiber powder or granules of varying fineness. High-speed impact and shearing combine to achieve optimal crushing: The fiber blades are staggered, and the grading wheel rotates at high speed to form an annular cutting surface, producing continuous tearing, shearing, and friction effects on the wood fibers. The coarse crushing module focuses on impact crushing, the shearing module on double-sided shearing, and the fine grinding module on grinding. This combination of multiple crushing mechanisms results in a more thorough final crushing effect, effectively separating and crushing even stubborn fibers containing lignin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a multi-level grading system; Figure 2 It is the overall schematic diagram of the fiber cutting structure; Figure 3 Schematic diagram of the fiber blade bundle structure; Figure 4 This is a schematic diagram of the fiber blade bundle inclination arrangement; Figure 5 Schematic diagram of fiber bundle angle in the same direction of fibers; Figure 6 This is a schematic diagram of the fiber cutting and crushing principle; Figure 7 、 Figure 8 It is the feed guide rail device structure; In the figure: 1-1, feed guide device, 1-2, fiber flying blade cutting device, 1-3, cyclone separator, 1-4, induced draft fan, 3-1, grading wheel, 3-2, flexible blade bundle, 3-3, support rod, 3-4, discharge area, 7-1, feed port, 7-2, guide cover, 8-1, tapered guide surface, 8-2, fiber cutting area, DETAILED DESCRIPTION It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations; For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0020] As described in the background section, the prior art presents certain technical challenges. To address these challenges, the present invention provides a fiber blade cutting device 1-2, including a wood fiber micro-nano crushing device, system, and method. This device innovatively utilizes fiber as a cutting tool, and based on this cutting tool, an innovatively designed fiber blade cutting micro-nano crushing device and method are developed. The cutting tool is constructed from fibers with excellent tensile strength, wear resistance, and heat resistance, capable of withstanding prolonged high-speed impact and repeated shearing without breaking, while also preventing metal sparks from impact, significantly improving the safety of the crushing process. The fiber blades generate stable cutting tension under the centrifugal force of rotation, and their flexibility buffers transient impact forces, reducing spindle vibration and noise, while also minimizing wear on the device's internal structures. Furthermore, this structure allows fibers to be mounted in multiple groups and at multiple angles around the rotating cutter disc, achieving a coordinated, layered construction of three-stage cutting functions: coarse crushing, shearing, and fine grinding. This allows for continuous wood fiber crushing and particle size control within a compact structure, offering high scalability and engineering adaptability.

[0021] The grating 3-1 is provided with a plurality of support rods 3-3 at both ends of the grading wheel 3-1, and each support rod 3-3 is provided with a plurality of support rods 3-3 at both ends of the grading wheel 3-1. The support rods 3-3 are arranged in a radial direction of the grading wheel 3-1, and the support rods 3-3 at both ends are arranged opposite to each other; and a plurality of circles of flexible blade bundles 3-2 are wound around the support rods 3-3 at both ends along the radial direction of the grading wheel 3-1. Each circle of flexible blade bundles 3-2 includes two strands, which are respectively wound around the left and right support rods 3-3 in a "snake-like path" and are arranged in a cross-alternating manner within one circle to form a staggered winding structure. A circle of flexible blade bundles 3-2 forms a cutter disc, and multiple circles of flexible blade bundles 3-2 form multiple cutter discs in sequence from the outer circle to the inner circle, so as to realize the functions of coarse crushing, shearing and fine grinding of the material. In this embodiment, Figure 2 As shown, five circles of flexible blade bundles 3-2 are provided, which is equivalent to forming five blade discs on the outer circle of the classifying wheel 3-1.

[0022] Each of the flexible blade beams 3-2 described above passes through the support rods 3-3 at both ends in a serpentine manner, and the two flexible blade beams 3-2 form a cross. The specific implementation method is as follows: Assume that the multiple support rods 3-3 located at the left end of the grading wheel 3-1 are called "left support rods," and the corresponding support rods 3-3 located at the right end of the grading wheel 3-1 are called "right support rods." Among the left support rods, any one is designated as the "first left support rod," and the right support rod corresponding to it in the axial direction is designated as the "first right support rod." The remaining support rods 3-3 are designated sequentially as the second left support rod, the third left support rod, and so on, up to the Nth left support rod. The right support rods are designated accordingly as the second right support rod, the third right support rod, and so on, up to the Nth right support rod. The winding method of the two flexible blade bundles 3-2 located in the same circle is specifically as follows: one end of the first flexible blade bundle 3-2 is fixed to the first left support rod, and the other end goes along the "snake path" to the right and successively passes through the second right support rod, the third left support rod, the fourth right support rod, the fifth left support rod, the sixth right support rod... until it returns to the first left support rod after the winding is completed, and the two ends are fixedly connected; the second flexible blade bundle 3-2: one end is fixed to the first right support rod, and the other end goes along the "snake path" to the left and successively passes through the second left support rod, the third right support rod, the fourth left support rod, the fifth right support rod, the sixth left support rod... and finally goes back to the first right support rod, and the two ends are fixedly connected. Through the above-mentioned symmetrical and staggered winding method, the two flexible blade bundles 3-2 form a spatial cross structure within the circle, forming a stable, staggered shearing network, which provides a basis for the subsequent multi-layer knife disc staggered arrangement.

[0023] Furthermore, the above-mentioned three-dimensional staggered fiber tool structure, such as Figure 3 As shown, each fiber blade bundle is composed of several high-performance fiber filaments bundled side by side to form a flexible blade bundle 3-2, and its two ends are fixed on the support frame at the edge of the central support frame 1. A cutting surface similar to a concentric ring grid is constructed (such as Figure 3 As shown in the figure, it realizes the synchronous shearing effect on wood fibers at multiple levels and angles during continuous rotation, significantly enhancing the cutting coverage and fiber processing capacity.

[0024] Furthermore, as shown in Figure 4, a schematic diagram of the circumferential angle offset structure between different fiber blade bundle groups in the present invention is shown. It can be seen that the fiber blade bundles wound by each layer of the blade disc are offset by a preset angle in the circumferential direction relative to the adjacent blade discs. The fiber blade bundles between different blade discs are staggered, forming a multi-layered, non-overlapping shear surface. This circumferential angle offset refers to the angle between the corresponding blade bundles in adjacent blade discs and the blade bundles of the previous layer in the circumferential direction during winding. For example, it can be set to 10°, 15°, etc. to avoid overlapping blade bundles in the same straight line direction, effectively improving cutting uniformity and reducing local load impact, thereby improving system stability and cutting frequency.

[0025] Furthermore, Figure 5 shows a schematic diagram of the structure within a single blade bundle assembly, showing how the angle of the fiber blade bundles arranged radially from the outer ring to the inner ring varies with position. As shown in the figure, the fiber blade bundles near the outer ring are installed at an angle of approximately 10° relative to the vertical axis, while those in the middle are approximately 20°, and those in the innermost ring are approximately 30°, forming a significant trend of increasing radial angle. This radial angle is the angle between the fiber blade bundle and the vertical main axis. Its variation helps to form staggered cutting paths at different radial positions, thereby improving fiber coverage and shearing efficiency and throughput per unit time.

[0026] Through the dual staggered design of the above-mentioned angular offset in the circumferential direction and the change in the installation inclination angle in the radial direction, multiple fiber blade bundles form a longitudinal multi-layer shear layer, and the fiber cutting points are more evenly distributed, which not only avoids the load fluctuation caused by synchronous cutting, but also significantly enhances the cutting frequency and crushing uniformity, effectively improving the continuity and stability of the whole machine operation.

[0027] Furthermore, the fiber cutter is preferably made of para-aramid fiber material, and para-aramid fiber is recommended. This material is a high-performance structural fiber independently developed in China, with excellent strength, toughness, heat resistance and flame retardancy, and is particularly suitable for the dry, high-speed, continuous cutting working environment described in the present invention. It should be noted that the material selection of the fiber cutter described in the present invention is not limited to para-aramid. Taking into account the requirements of different application scenarios for cost, environmental adaptability and availability, other domestic or imported high-performance fiber materials with similar mechanical strength, wear resistance and thermal stability, such as carbon fiber, glass fiber, polyester fiber, etc., can also be selected as substitutes. The selected fibers can meet the use strength and safety requirements under dry high-speed cutting conditions, and can be regarded as equivalent implementation plans.

[0028] The fiber blade bundle used in the present invention is selected and configured according to the functional requirements of different cutting stages, so as to take into account the cutting strength, flexible response and final crushing effect.

[0029] Furthermore, based on the above-mentioned fiber flying blade cutting device 1-2, this embodiment also provides a wood fiber micro-nano crushing device, including the above-mentioned fiber flying blade cutting device 1-2 and a feed guide rail device 1-1; the feed guide rail device 1-1 includes a guide cover 7-2, a feed port 7-1 is provided at one end of the guide cover 7-2, a conical guide rail surface 8-1 and an inner shell are provided within the guide cover 7-2, the conical guide rail surface 8-1 is provided at one end of the inner shell, the inner shell is provided with a plurality of holes, and a cutting area is formed inside the inner shell. The above-mentioned fiber flying blade cutting device 1-2 is provided in the cutting area and is coaxial with the above-mentioned inner shell; Furthermore, the present embodiment also provides a wood fiber micro-nano crushing system, comprising a multi-stage wood fiber micro-nano crushing device and a multi-stage cyclone separator 1-3; the cyclone separator 1-3 is arranged at the rear end of the corresponding wood fiber micro-nano crushing device; along with the conveying direction of the material, the diameter of the aramid monofilament of the flexible blade bundle 3-2 of the wood fiber micro-nano crushing device of the previous stage is greater than the diameter of the aramid monofilament of the flexible blade bundle 3-2 of the wood fiber micro-nano crushing device of the next stage; specifically, the overall structure of the fiber-based dry rotary cutting device (suitable for wood fiber) provided by the present invention is as follows Figure 1 As shown, it includes a conical feeding system, a multi-stage fiber cutting module, an air delivery and discharging system (not shown in the figure) and a cyclone gas-solid separation device, which can realize continuous and efficient dry crushing processing of wood fibers.

[0030] The device features a modular design. Each stage of the crushing module is attached to the same main shaft system and arranged in series, following the principle of progressively finer particle size. From the outside in, the crushing modules are divided into coarse crushing, shearing, and fine grinding zones. Each crushing module is separated by sieve plates or guide structures, with gradually decreasing sieve size. This ensures that only materials that meet the required particle size can enter the next stage, achieving precise control.

[0031] like Figure 2 As shown, each module is equipped with a high-strength flexible fiber blade bundle. The fiber material is preferably para-aramid monofilament. The monofilament diameter is divided into three levels based on the functional requirements of the comminution stage: 30–50 μm (coarse crushing), 20–30 μm (shearing), and 10–20 μm (fine grinding). The blade bundle is composed of multiple monofilaments arranged side by side and mounted on the rotating cutter disc via a clamping structure. As the main shaft rotates, it forms a stable and tensioned cutting rope, which shears, tears, and frictionally grinds the material.

[0032] In order to improve cutting stability and operating efficiency, the fiber blade bundles are staggered and arranged on each blade disc level ( Figure 3 ), the blade beams on each layer are offset at an angle to avoid overlapping cutting paths. Furthermore, the blade beams are arranged gradually tighter from the outer layer to the inner layer, ensuring a smooth transition from loose to dense cutting, achieving higher cutting accuracy and particle size control.

[0033] Materials Figure 6 The material enters the feed port 7-1 shown, first forms a uniform downward flow in the closed guide cover 7-2 through the conical guide rail, and after preliminary fracture in the coarse crushing area, enters the shearing area through the large-aperture guide hole at the bottom of the module for medium-grain shearing, and then enters the fine grinding module to complete the final high-frequency grinding.

[0034] After cutting, the material flows along the central guide rail into the central axis discharge system. This structure incorporates an integrated centrifugal induced draft fan 1-4, which drives a negative pressure airflow that pumps the crushed material along the axis to the discharge channel. A rotating classifying wheel 3-1 within the system selects fine powder that meets the required particle size for entry into the cyclone separator 1-3. The cyclone separator 1-3 utilizes a classic conical structure to achieve gas-solid separation, ultimately discharging the powder evenly.

[0035] The entire device features an enclosed metal shell. During operation, cooling and ventilation structures and static elimination modules are incorporated to prevent high temperatures and dust accumulation, improving safety and product yield. The blade bundle is easily replaceable and has a long maintenance cycle, making it suitable for industrial continuous operation. The device utilizes a multi-stage fiber cutting structure combined with a modular air-discharging system to efficiently pulverize, grade, and discharge wood fibers without the need for liquid intervention, making it suitable for diverse engineering needs in the preparation of fiberized micro-nano powders.

[0036] This device utilizes a scalable, multi-stage, graded cutting structure, allowing for flexible configuration with two, three, or more stages depending on particle size requirements. Figure 1 illustrates the two-stage structure. Each stage is connected in series along the process flow, forming a continuous dry pulverization process from coarse crushing and shearing to fine grinding. After being introduced through the feed cone, the wood feedstock enters the first-stage cutting unit for initial crushing. The coarse crushed material, after being separated from the carrier gas by cyclones 1-3, is then conveyed directly to the second-stage module for shearing and refinement of medium-sized particles. The graded medium-sized material then undergoes cyclone separation in the second stage before proceeding to the next cutting stage for final high-density fiberization or fine powder grinding. The entire system achieves step-by-step particle size control, modular separation, and continuous operation. It boasts a compact structure, stable operation, and high crushing precision, making it suitable for efficient, multi-stage pulverization and processing of wood fibers under dry conditions.

[0037] In this device, each functional module is equipped with multiple sets of high-strength fiber blades, the overall structure of which is shown in Figure 2. Each blade set consists of several high-performance fiber filaments bundled side by side to form a flexible blade bundle 3-2, which is mounted to the outer edge of the cutting area via a clamping structure. A main shaft runs through the center of the cutting area, serving as the system's central rotation axis and extending axially through the multiple cutting modules. Driven by a motor and supported by bearings, the main shaft rotates at high speed, thereby driving the synchronous rotation of the various grading wheels 3-1 mounted on it. As the main shaft rotates, each grading wheel 3-1 and the flexible blade bundles 3-2 wound around it rotate as a whole. Centrifugal force automatically tensions the fiber blade bundles radially, forming a high-tension, rotating cutting cable that efficiently shears and tears the wood material. To ensure continuity and uniformity in the cutting process, the fiber blade groups are arranged at angular staggered positions along the circumference of each cutter disc. Adjacent blade groups are offset by a preset angle to avoid simultaneous cutting along the same radial line. This effectively reduces load peaks, vibrations, and operational stability. Furthermore, within the different layers of the cutter disc, the spatial arrangement of the fiber blades exhibits a hierarchical change, gradually becoming denser from the outer ring to the inner ring: as the cutting position approaches the center, the spacing between the blades decreases, resulting in a more compact arrangement. This multi-level arrangement, with a loose outer layer and dense inner layer, allows the cutting process to gradually transition from initial crushing to high-frequency fine crushing, further improving overall cutting accuracy and particle size control.

[0038] The fiber blade bundles used in this invention are specifically selected and configured based on the functional requirements of different cutting stages, ensuring a balanced balance of cutting strength, flexible response, and final crushing performance. The primary coarse crushing module utilizes a high-strength blade bundle composed of bundles of relatively coarse-diameter aramid monofilaments (30–50 μm). This structure possesses excellent tensile strength and impact resistance, capable of withstanding the instantaneous impact loads generated by the high-speed rotation of large wood fiber blocks, effectively achieving initial tearing and fracture cutting. The intermediate shearing module utilizes a flexible blade bundle 3-2 composed of medium-diameter fiber filaments (20–30 μm). This improves cutting density and cutting response, ensuring smooth material transitions during force application, reducing vibration, and enhancing cutting continuity and medium-particle size control accuracy. In the fine grinding module, fine fiber monofilament bundles with a diameter of 10–20 μm are preferred. Under centrifugal force, these blade bundles form a dense, flexible cutting cable, suitable for multi-angle shearing and friction grinding of medium and fine particles, ultimately achieving fiberization or pulverization. Fine fiber bundles offer excellent flexibility and high-frequency shearing capabilities, enabling high-quality end-of-line crushing at low loads. By grading and modularizing the fiber bundles, the tool system achieves adaptive processing and graded control of materials of varying particle sizes while maintaining overall strength and lifespan, improving overall operational efficiency and finished product consistency.

[0039] The logs enter the device from the left and are first evenly fed into the central high-strength fiber blade area through a conical guide structure. Driven by the high-speed rotation of the main shaft, multiple longitudinally arranged fiber blades are automatically tensioned due to centrifugal force, forming a dense cutting curtain. As the wood fibers pass through these staggered fiber bundles, they are subjected to continuous, high-frequency shearing and tearing. After cutting, the raw materials are crushed into fine, uniform wood fibers or sawdust, which are discharged through the bottom channel of the system and finally formed. Figure 5 shown The feeding system of this device adopts an integrated cone sleeve introduction structure, which is integrated into the outermost layer of the cutting module to guide the raw materials evenly into the fiber cutting area 8-2. Figure 6 , the structure shown is a three-dimensional view and a cross-sectional schematic diagram of the feeding device. The raw material enters from the feed port 7-1 set on the left side of the device. This part has a conical structure that covers the entire outside of the cutting cavity, forming a closed guide cover 7-2. After entering, the material first contacts the conical guide surface 8-1. The conical surface is used to evenly disperse the concentrated inflowing raw materials in the axial direction to the circumferential direction, forming a uniformly distributed downward material flow. The conical surface guides the material to slide radially and gradually transition to the fiber cutting area 8-2 below, realizing the diversion and widening of the material, and providing a continuous and evenly distributed raw material channel for subsequent multiple groups of fiber blade bundles. This structure not only has the triple functions of guiding, buffering and dispersing, but also can form a sleeve-type linkage closed cavity with the main cutting device in structure, effectively preventing dust from overflowing and enhancing feeding stability. Combined with the air conveying system, the material transportation efficiency can be further improved, so that the large-particle size wood fiber raw materials can be smoothly transitioned to the cutting and processing area.

[0040] The discharge system of this device is located below the central axis of the cutting structure. It utilizes an integrated design combining central flow guidance, centrifugal suction, and gas-solid separation to achieve continuous and efficient collection and separation of fibrous powders. The discharge structure is located at the very center of the fiber cutting device. The pulverized material flows along the central guide rail of the cutting chamber into the central discharge channel. To the left of this channel, an integrated centrifugal induced draft fan 1-4, equipped with backward-inclined blades, rotates at high speed to create a stable negative pressure airflow, which propels the material from the center of the cutting chamber outward along the axis. Compared to traditional gravity discharge methods, this structure offers stronger suction capacity and higher conveying efficiency, making it suitable for low-density, easily suspended fine fiber powders. Before the material enters the discharge channel, a classifying wheel 3-1 is installed within the system for initial particle size screening and control. Rotating at high speed at the cutting end, the classifying wheel 3-1 returns coarse particles that do not meet the required particle size to the cutting area for secondary shearing, while allowing fine particles to enter the discharge channel smoothly with the airflow. This classification mechanism further improves the uniformity of product particle size and overall processing efficiency. The extracted mixture then enters cyclone separators 1-3 for gas-solid separation.

[0041] Cyclone separators 1-3 utilize a classic conical design. The mixed flow enters the inner wall of the cylinder at high speed along a tangential direction. Centrifugal force forces denser solid particles down the conical wall and into the bottom discharge port. Meanwhile, less dense gas spirals upward along the central axis and is discharged through the top exhaust port, effectively separating the material from the carrier gas. This compact, stable suction system enables efficient transfer, closed discharge, and separate collection of fibrous powders without relying on gravity. This significantly improves the safety and automation of the discharge process, making it particularly suitable for continuous pulverization applications requiring high dust concentration and explosion-proof handling.

[0042] The entire unit is enclosed in a sturdy metal shell, housing a multi-stage crushing chamber. These chambers are equipped with feed holes or replaceable screens to control particle flow and size. A large through-hole at the bottom of the coarse crushing module allows only material of a certain size to enter the shearing module. A medium-sized screen is placed between the shearing module and the fine grinding module to perform screening. The bottom of the fine grinding module serves as the outlet for the finished product, connecting to a collection chamber or a discharge pipe. The upper portion of the housing features a feed port 7-1, which connects to the aforementioned external feed pipe. The lower portion features a discharge port for connecting to a collection bin or conveyor. To ensure long-term, continuous operation, the housing sidewalls are equipped with multiple sets of heat dissipation louvers or cooling ventilation structures. The spindle motor also incorporates a cooling fan, which simultaneously provides adequate ventilation for the crushing chamber, dissipating heat and wood dust generated during the crushing process and preventing overheating. For operational safety, a splash guard and feed rails are installed near feed port 7-1. When manually feeding small wood pieces, the rails guide the material smoothly into the chamber and prevent direct contact with rotating components.

[0043] The above structures work together to achieve step-by-step dry crushing of wood fibers from coarse crushing to fine grinding, and the structural design is compact and reasonable.

Claims

1. A fiber flying blade cutting device, characterized in that: The utility model comprises a grading wheel and a flexible blade bundle, wherein a plurality of feed gaps are arranged on the side wall of the grading wheel, and a plurality of support rods are respectively arranged at both ends of the grading wheel along its circumferential direction, each support rod is arranged along the radial direction of the grading wheel, and the support rods at both ends are arranged opposite to each other; and a plurality of circles of flexible blade bundles are wound around the support rods at both ends from the outside to the inside along the radial direction of the grading wheel, and a circle of flexible blade bundles forms a cutter disc, and the flexible blade bundles in each circle of flexible blade bundles are arranged in an angular staggered manner along the circumferential direction, and the flexible blade bundles of adjacent circles are offset at a preset angle.

2. The fiber flying blade cutting device according to claim 1, characterized in that: Each circle of flexible blade beams includes two flexible blade beams, each flexible blade beam passes through the support rods at both ends in a serpentine manner, and the two flexible blade beams form a cross.

3. The fiber flying blade cutting device according to claim 1, characterized in that: Along the radial direction of the classifying wheel, from outside to inside, the radial distance between adjacent cutter discs becomes smaller and smaller.

4. The fiber flying blade cutting device according to claim 1, characterized in that: One end of the grading wheel is closed, and the other end is open to form a discharge port.

5. The fiber flying blade cutting device according to claim 1, characterized in that: The flexible blade bundle is composed of a plurality of high-performance fiber filaments bundled side by side.

6. A wood fiber micro-nano crushing device, characterized in that: The invention comprises the fiber flying blade cutting device and the feed guide rail device as described in any one of claims 1 to 5.

7. The wood fiber micro-nano crushing device according to claim 6, characterized in that: The feed guide device includes a guide cover, a feed port is set at one end of the guide cover, a conical guide surface and an inner shell are set inside the guide cover, the conical guide surface is set at one end of the inner shell, a plurality of holes are set on the inner shell, and a cutting area is formed inside the inner shell.

8. The wood fiber micro-nano crushing device according to claim 6, characterized in that: The fiber flying blade cutting device is arranged in the cutting area and is coaxial with the inner shell.

9. A wood fiber micro-nano crushing system, characterized in that: It comprises a multi-stage wood fiber micro-nano crushing device according to any one of claims 6 to 8 and a multi-stage cyclone separator; the cyclone separator is arranged at the rear end of the corresponding wood fiber micro-nano crushing device.

10. The wood fiber micro-nano crushing system according to claim 9, characterized in that: Along with the conveying direction of the material, the diameter of the aramid monofilament of the flexible blade bundle of the wood fiber micro-nano crushing device of the previous stage is greater than the diameter of the aramid monofilament of the flexible blade bundle of the wood fiber micro-nano crushing device of the next stage.

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