A kind of fiber fly blade cutting device includes the wood fiber micro-nano crushing device, system of the cutting device

Abstract

The application discloses a kind of fiber flying blade cutting device including the cutting device, wood fiber micro-nano crushing device, system, including grading wheel and flexible knife bundle, a plurality of feed gaps are provided on the side wall of the grading wheel, a plurality of support rods are respectively provided along the circumferential direction of the two ends of grading wheel, each support rod is arranged along the radial direction of grading wheel, and the support rods at both ends are oppositely arranged;And a plurality of turns of flexible knife bundle are wound from outside to inside on the support rods at both ends along the radial direction of grading wheel, and a turn of flexible knife bundle forms a cutterhead, and the flexible knife bundles in each turn of flexible knife bundle are arranged at an angle in the circumferential direction, and the flexible knife bundles of adjacent turns are offset at a preset angle.

Description

Technical Field

[0001] This invention belongs to the field of equipment technology, and particularly relates to a fiber cutting device including a wood fiber micro-nano crushing device and system. Background Technology

[0002] Currently, wood fibers, due to their rich cellulose and lignin content and high toughness, are difficult to directly pulverize into micro-nano-sized particles. Existing wood fiber pulverizing processes generally employ multi-stage crushing using metal blades or hammer mills. Common processes require multiple devices to be used in sequence, resulting in complex operations, high energy consumption, frequent material transfers, and repeated grinding, leading to low efficiency.

[0003] Furthermore, traditional metal cutting tools have significant drawbacks in high-speed cutting of wood fibers: their blades are prone to wear and chipping when continuously impacting wood or hard objects, affecting not only their service life but also potentially generating metallic sparks. In dry pulverization environments, lignin, rich in volatile components and with a low ignition point, combined with the large amount of fine dust generated during pulverization, can easily form a flammable dust cloud in a confined space, potentially igniting upon contact with an ignition source. Therefore, the use of metal cutting tools presents significant safety hazards, especially in scenarios requiring high-speed, high-frequency pulverization operations, where the technological risks are further amplified. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention aims to provide a fiber-cutting device, including a wood fiber micro / nano crushing device and system, which solves the problems of complex crushing processes, easy tool wear, and low efficiency of dry crushing in the prior art. Through structural optimization and the application of novel fiber blades, it achieves step-by-step crushing of wood fiber raw materials without liquid intervention, outputting fibrous or powdered materials with controllable particle size, and has advantages such as compact structure, continuous operation, safety, and high efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: Firstly, this invention proposes a fiber cutting device comprising a grading wheel and flexible blade bundles. Several feeding gaps are provided on the sidewall of the grading wheel. Several support rods are respectively arranged at both ends of the grading wheel along its circumferential direction, each support rod being arranged along the radial direction of the grading wheel, with the support rods at both ends facing each other. Multiple turns of flexible blade bundles are wound from the outside to the inside along the radial direction of the grading wheel on the support rods at both ends, with each turn of flexible blade bundle forming a cutter disc. The flexible blade bundles in each turn are arranged at an angle offset along the circumferential direction, and adjacent turns of flexible blade bundles are offset at a preset angle. That is, to achieve continuity and uniformity in the cutting process, the fiber blade bundles are arranged at an angle offset along the circumferential direction at each cutter disc level, and adjacent blade bundles are offset at a preset angle, avoiding synchronous cutting along the same radial line, thereby effectively reducing peak load, reducing vibration, and improving operational stability.

[0006] This device is used to rapidly shred and grind wood fibers into fibrous or powdered products of the desired micro-nano size without the intervention of liquid.

[0007] As a further technical solution, each flexible blade bundle includes two flexible blade bundles, each flexible blade bundle passing through the support rods at both ends in a serpentine manner, and the two flexible blade bundles intersect.

[0008] As a further technical solution, along the radial direction of the grading wheel, the radial distance between adjacent cutter discs decreases from the outside to the inside; that is, the spatial arrangement of the fiber blades also exhibits a hierarchical change characteristic of "gradually denser from the outer circle to the inner circle": as the cutting position of the cutter disc moves closer to the center, the interval between the fiber blades gradually decreases, and the arrangement becomes more compact. This multi-level arrangement structure, which is loose on the outside and dense on the inside, allows the cutting process to gradually transition to high-frequency fine crushing after the initial crushing of the raw material, improving the overall cutting accuracy and particle size control effect.

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

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

[0011] Secondly, the present invention also provides a wood fiber micro-nano crushing device, including the fiber blade cutting device and the feeding guide device described above.

[0012] As a further technical solution, the feeding guide device includes a guide cover, a feeding port is provided at one end of the guide cover, a tapered guide surface and an inner shell are provided inside the guide cover, one end of the inner shell is provided on the tapered guide surface, the inner shell is provided with several holes, and a cutting area is formed inside the inner shell.

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

[0014] Thirdly, the present invention also provides a wood fiber micro-nano crushing system, including a multi-stage wood fiber micro-nano crushing device and a multi-stage cyclone separator; the cyclone separator is located at the rear end of the corresponding wood fiber micro-nano crushing device.

[0015] As a further technical solution, depending on the material conveying direction, the diameter of the aramid monofilament in the flexible blade bundle of the preceding stage wood fiber micro-nano crushing device is larger than the diameter of the aramid monofilament in the flexible blade bundle of the following stage wood fiber micro-nano crushing device. The beneficial effects of this invention are as follows: 1) The three-dimensional staggered fiber blade structure proposed in this invention constructs a cutting surface resembling a concentric ring grid, achieving multi-layered and multi-angle synchronous shearing of wood fibers during continuous rotation, significantly enhancing cutting coverage and fiber processing capacity. Simultaneously, the flexible blade bundles are arranged at an angled offset along the circumference, with adjacent bundles offset at a preset angle, forming a distinct multi-layered staggered cutting surface and avoiding overlap of blade bundles on the same cutting path, ensuring a more uniform distribution of cutting points during rotation. Through this angled offset design, multiple fiber blade groups form mutually independent shearing layers in the longitudinal direction, thereby improving cutting frequency and overall stability. The high-strength fiber blades exhibit excellent wear resistance when pulverizing wood fibers, with a lifespan far exceeding that of traditional metal blades, reducing the cost and downtime associated with frequent blade replacements. The flexible operation of the fiber blades does not generate metal fragments or sparks, reducing equipment damage and fire risks. Furthermore, replacing the fiber blade bundles is simple, requiring no professional blade sharpening, and daily maintenance is convenient and safe.

[0016] 2. The wood fiber micro-nano crushing device proposed in this invention integrates multiple functions such as coarse crushing, shearing, and fine grinding into one device. The material is continuously crushed in different modules of the same main shaft, eliminating the need for intermediate transfer. Combined with air-feeding, it can realize continuous production line processing of wood fibers, significantly improving crushing efficiency.

[0017] 3. The wood fiber micro-nano crushing system proposed in this invention, through a graded combination design, ensures that materials can only enter the next stage or be discharged as finished products after reaching the required particle size, achieving precise particle size control. The final output particle size is uniform and adjustable; the sieve aperture can be changed as needed to obtain wood fiber powder or fragments of different fineness. High-speed impact and shearing are combined for excellent crushing effect: the fiber blades are arranged in an alternating pattern, and the high-speed rotation of the grading wheel forms a ring-shaped cutting surface, generating continuous tearing, shearing, and frictional effects on the wood fibers. The coarse crushing module focuses on impact crushing, the shearing module focuses on double-sided shearing, and the fine grinding module focuses on grinding and polishing. The combination of multiple crushing mechanisms makes the final crushing effect more thorough, and even stubborn fibers containing lignin can be effectively separated and crushed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a multi-level hierarchical system; Figure 2 This is a schematic diagram of the overall fiber cutting structure; Figure 3 This is a schematic diagram of the fiber optic knife bundle structure; Figure 4 This is a schematic diagram showing the angled arrangement of the fiber blade bundles; Figure 5 This is a schematic diagram of the angle of the fiber bundles in the same direction; Figure 6 This is a schematic diagram illustrating the principle of fiber cutting and pulverizing. Figure 7 , Figure 8 The structure is for the feeding guide rail device; In the diagram: 1-1, Feeding guide rail device; 1-2, Fiber cutting device; 1-3, Cyclone separator; 1-4, Exhaust fan. 3-1. Grading wheel; 3-2. Flexible blade bundle; 3-3. Support rod; 3-4. Discharge area; 7-1. Feed inlet; 7-2. Guide cover; 8-1. Conical guide rail surface; 8-2. Fiber cutting area. Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] As described in the background section, existing technologies have certain technical problems. To address these problems, this invention provides a fiber-blade cutting device 1-2, including a wood fiber micro / nano crushing device, system, and method. This device innovatively uses fiber as a cutting tool, and based on this cutting tool, an innovative wood fiber micro / nano crushing device and method for fiber-blade cutting is designed. The cutting tool is made of fiber with excellent tensile strength, wear resistance, and heat resistance, capable of withstanding prolonged high-speed impact and repeated shearing without breaking, while also preventing the generation of metal sparks due to impact, significantly improving the safety of the crushing process. Under the action of centrifugal force, the fiber blade can form a stable cutting tension, and its flexible characteristics can buffer instantaneous impact force, reducing spindle vibration and noise, while also reducing wear on the internal structure of the equipment. Furthermore, this structure allows fibers to be mounted around the rotating cutter head in multiple groups and at multiple angles, achieving a synergistic layered construction of three-stage cutting functions: coarse crushing, shearing, and fine grinding. This allows for continuous crushing and particle size control of wood fibers within a compact structure, possessing high scalability and engineering adaptability.

[0021] Specifically, this embodiment provides a fiber cutting device 1-2, including a grading wheel 3-1 and a flexible blade bundle 3-2. Several feeding gaps are provided on the side wall of the grading wheel 3-1, with a discharge area 3-4 inside. Several support rods 3-3 are respectively arranged along the circumferential direction at both ends of the grading wheel 3-1. Each support rod 3-3 is arranged along the radial direction of the grading wheel 3-1, with the support rods 3-3 at both ends facing each other. Multiple turns of the flexible blade bundle 3-2 are wound around the support rods 3-3 at both ends along the radial direction of the grading wheel 3-1. Each turn of the flexible blade bundle 3-2 includes two strands, which respectively pass through the left and right support rods 3-3 in a "serpentine path," forming an alternating cross arrangement within one turn, constituting an interlaced winding structure. One turn of the flexible blade bundle 3-2 forms a cutter disc, and multiple turns of the flexible blade bundle 3-2 sequentially form multiple cutter discs from the outer circle to the inner circle, realizing functions such as coarse crushing, shearing, and fine grinding of materials. In this embodiment, as shown... Figure 2 As shown, five flexible blade bundles 3-2 are set, which is equivalent to forming five blade discs on the outer ring of the grading wheel 3-1.

[0022] Each of the aforementioned flexible blade bundles 3-2 passes sequentially through the support rods 3-3 at both ends in a serpentine manner, and the two flexible blade bundles 3-2 intersect. The specific implementation method is as follows: Assume the multiple support rods 3-3 located at the left end of the classifier wheel 3-1 are designated as "left support rods," and the corresponding support rods 3-3 located at the right end of the classifier wheel 3-1 are designated as "right support rods." Among the left support rods, one is chosen as the "first left support rod," and the right support rod corresponding to it in the axial direction is then designated as the "first right support rod." The remaining support rods 3-3 are sequentially named 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 correspondingly named 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 as follows: one end of the first flexible blade bundle 3-2 is fixed to the first left support rod, and the other end follows a "serpentine path" to the right, successively winding around 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, and so on, until it returns to the first left support rod after 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 follows a "serpentine path" to the left, successively winding around 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 so on, finally winding back to the first right support rod, and the two ends are fixedly connected. Through the above symmetrical and staggered winding method, the two flexible blade bundles 3-2 form a spatial cross structure within this circle, forming a stable and staggered shearing network, providing a foundation for the subsequent multi-layer blade disc staggered arrangement.

[0023] Furthermore, the aforementioned three-dimensional staggered fiber tool structure, such as Figure 3 As shown, each fiber blade bundle consists of several high-performance fiber filaments bundled side-by-side to form a flexible blade bundle 3-2, with both ends fixed to the support frame at the edge of the central support bracket 1. This creates a cutting surface resembling a concentric ring grid (as shown). Figure 3 As shown in the figure, it achieves simultaneous shearing of wood fibers at multiple levels and angles during continuous rotation, which significantly enhances the cutting coverage and fiber processing capacity.

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

[0025] Furthermore, as shown in Figure 5, a schematic diagram illustrates the structural variation of the fiber blade bundle arrangement angle along the radial direction from the outer to the inner ring within a single blade bundle assembly. The figure shows that the fiber blade bundles near the outer ring have an installation angle of approximately 10° relative to the vertical axis, approximately 20° in the middle, and approximately 30° in the innermost ring, forming a significant increasing trend in radial angle. This radial angle is the angle between the fiber blade bundle and the vertical main axis; its variation helps to create staggered cutting paths at different radial positions, thereby improving the fiber coverage and shearing effect and the throughput per unit time.

[0026] Through the dual misalignment design of circumferential angular offset and radial installation tilt change, multiple fiber blade bundles form a longitudinal multi-layer shearing layer, and the fiber cutting points are more evenly distributed. This not only avoids load fluctuations 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 cutting tool is preferably made of para-aramid fiber, and the use of para-aramid fiber is recommended. This material is a high-performance structural fiber independently developed in China, possessing excellent strength, toughness, heat resistance, and flame retardant properties, making it particularly suitable for the dry, high-speed, and continuous cutting environment described in this invention. It should be noted that the material selection for the fiber cutting tool in this invention is not limited to para-aramid. Considering the requirements of different application scenarios regarding 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, and polyester fiber, can also be used as substitutes. Any fiber that meets the strength and safety requirements under dry high-speed cutting conditions can be considered an equivalent implementation scheme.

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

[0029] Furthermore, based on the aforementioned fiber cutting device 1-2, this embodiment also provides a wood fiber micro / nano crushing device, including the aforementioned fiber cutting device 1-2 and a feeding guide device 1-1; the feeding guide device 1-1 includes a guide cover 7-2, with a feed inlet 7-1 at one end of the guide cover 7-2, and a conical guide surface 8-1 and an inner shell disposed inside the guide cover 7-2. One end of the inner shell is disposed on the conical guide surface 8-1, and the inner shell has several holes, forming a cutting area inside the inner shell. The fiber cutting device 1-2 is disposed within the cutting area and is coaxially arranged with the inner shell. Furthermore, this embodiment also provides a wood fiber micro / nano crushing system, including multiple stages of the aforementioned wood fiber micro / nano crushing devices and multiple stages of cyclone separators 1-3; the cyclone separators 1-3 are located at the rear end of the corresponding wood fiber micro / nano crushing devices; depending on the material conveying direction, the diameter of the aramid monofilament of the flexible blade bundle 3-2 of the previous stage wood fiber micro / nano crushing device is larger than the diameter of the aramid monofilament of the flexible blade bundle 3-2 of the subsequent stage wood fiber micro / nano crushing device; specifically, the overall structure of the dry rotary cutting device based on fiber (suitable for wood fiber) provided by this invention is as follows: Figure 1 As shown, it includes a conical feeding system, a multi-stage fiber cutting module, a pneumatic discharge 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, with each crushing module attached to the same main shaft system and arranged in series according to the principle of progressively finer particle size. From the outside in, it includes a coarse crushing zone, a shearing zone, and a fine grinding zone. The crushing modules are separated by sieves or flow guide structures, with the sieve aperture size decreasing at each stage. This ensures that material can only enter the next stage after meeting the particle size requirements, 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, and the monofilament diameter is divided into three levels according to the functional requirements of the crushing 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 installed on the rotating cutter head through a clamping structure. When the main shaft rotates, it forms a stable and taut cutting cable, which achieves shearing, tearing, and friction grinding effects on the material.

[0032] To improve cutting stability and operating efficiency, the fiber blade bundles are arranged in a staggered manner at each blade disc level. Figure 3 The blade bundles in each layer are offset at an angle to avoid overlapping cutting paths. In addition, the blade bundles are arranged gradually from the outer layer to the inner layer, ensuring a smooth transition from loose to dense in the cutting process, achieving higher cutting accuracy and particle size control.

[0033] Materials from Figure 6 The material enters through the feed inlet 7-1 and first forms a uniform downward flow in the closed guide cover 7-2 through the conical guide rail. After initial crushing in the coarse crushing zone, it enters the shearing zone through the large-diameter 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 shaft discharge system. An integrated centrifugal fan 1-4 is installed in this structure, driving a negative pressure airflow to pump the pulverized material along the axis to the discharge channel. The system includes a rotary classifier 3-1, which can screen out fine powder that meets the particle size requirements and send it to the cyclone separator 1-3. The cyclone separator 1-3 uses a classic conical structure to achieve gas-solid separation, ultimately discharging the powder evenly.

[0035] The entire device features a sealed metal casing design. During operation, it incorporates a cooling and ventilation system and an electrostatic discharge module to prevent high temperatures and dust accumulation, thereby improving safety and product yield. The blade assembly is easy to replace, has a long maintenance cycle, and is suitable for continuous industrial applications. Through a multi-stage fiber cutting structure and a modular pneumatic conveying system, this device enables efficient pulverization, grading, and discharge of wood fibers without liquid intervention, making it suitable for various engineering needs in the preparation of fibrous micro / nano powders.

[0036] This device employs an expandable multi-stage grading and cutting structure, which can be flexibly configured into two, three, or more stages according to the required particle size. Figure 1 shows a schematic diagram of the two-stage structure. Each stage is connected in series along the flow direction, forming a continuous dry grinding path from coarse crushing and shearing to fine grinding. After being introduced through a feed cone sleeve, the woody raw material first enters the first-stage cutting device for preliminary crushing. The coarsely crushed product is then carried by the airflow through cyclone separators 1-3 to separate large particles from the carrier gas, and is directly conveyed to the second-stage module for medium-sized particle size shearing and refining. The graded medium-sized crushed material is then further processed by the second-stage cyclone separator before entering the next-stage cutting area to complete the final high-density fiberization or fine powder grinding. The entire system achieves step-by-step particle size control, modular separation, and continuous operation. It features a compact structure, stable operation, and high grinding precision, making it suitable for efficient multi-stage grinding 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, and its overall structure is shown in Figure 2. Each set of blades consists of several high-performance fiber filaments bundled side by side to form a flexible blade bundle 3-2, which is installed on the outer edge of the cutting area through a clamping structure. The main shaft in the middle of the cutting area carries the load and serves as the central rotation axis of the system, passing through multiple cutting modules along the axial direction of the device. The main shaft is driven by a motor and supported by bearings to achieve high-speed rotation, thereby driving the graded rollers 3-1 mounted on it to rotate synchronously. As the main shaft rotates, each graded roller 3-1 and the flexible blade bundle 3-2 wound on it rotate as a whole. Under the action of centrifugal force, the fiber blade bundles are automatically tensioned radially to form a high-speed rotating cutting cable with tension, which can efficiently shear and tear wood raw materials. In order to achieve continuity and uniformity in the cutting process, the fiber blade sets are arranged at an angle offset along the circumference of each blade disc layer, and adjacent blade sets are offset by a preset angle to avoid synchronous cutting on the same radial line, thereby effectively reducing the peak load, reducing vibration, and improving operational stability. Meanwhile, in the different layers of the cutter head structure, the spatial arrangement of the fiber blades also exhibits a hierarchical change characteristic of "gradually denser from the outer circle to the inner circle": that is, as the cutting position moves closer to the center, the spacing between the blade bundles gradually decreases, and the arrangement becomes more compact. This multi-level arrangement structure, which is loose on the outside and dense on the inside, allows the cutting process to gradually transition to high-frequency fine crushing after the initial crushing of the raw material, further improving the overall cutting accuracy and particle size control effect.

[0038] The fiber blade bundles used in this invention are specifically selected and configured according to the functional requirements of different cutting stages, taking into account cutting strength, flexible response, and final crushing effect. The primary coarse crushing module uses a high-strength blade bundle formed by bundling relatively large-diameter aramid monofilaments (30–50 μm). This structure possesses excellent tensile strength and impact resistance, capable of withstanding the instantaneous impact load generated by large pieces of wood fiber raw material under high-speed rotation, effectively completing initial tearing and fracture cutting. The intermediate shearing module uses a flexible blade bundle 3-2 composed of medium-diameter fiber filaments (20–30 μm) to improve cutting density and cutting response speed, ensuring a smooth transition of material under force, reducing vibration, and improving 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. This type of blade bundle can form a high-density, flexible distribution of cutting cords under centrifugal force, suitable for multi-angle shearing and friction grinding of medium and fine particles, ultimately achieving fiberization or pulverization. Fine fiber bundles possess excellent flexibility and high-frequency shearing capabilities, facilitating high-quality end-point pulverization under low loads. Through graded selection and modular arrangement of fiber bundle thickness, the cutting tool system achieves adaptive processing and graded control of materials with different particle sizes while ensuring overall strength and lifespan, thereby improving the overall operating efficiency and product consistency of the device.

[0039] The logs enter the device from the left and are first evenly fed into the central high-strength fiber blade bundle area through a conical guide structure. Driven by the high-speed rotation of the main shaft, multiple longitudinally arranged fiber blade bundles are automatically tensioned by centrifugal force, forming a dense cutting curtain. As the wood fibers pass through these interlaced fiber bundles, they are subjected to continuous, high-frequency shearing and tearing. After cutting, the raw material is pulverized into fine, uniform wood fibers or wood chips, which are discharged through the bottom channel of the system, ultimately forming... Figure 5 As shown The feeding system of this device adopts an integrated conical sleeve guide structure, which is integrated into the outermost layer of the cutting module to guide the raw material evenly into the fiber cutting zone 8-2. (See also...) Figure 6 The structure shown is a three-dimensional view and cross-sectional schematic diagram of the feeding device. Raw materials enter through the feed inlet 7-1 on the left side of the device. This inlet has a conical structure that covers the entire cutting cavity, forming a closed guide shroud 7-2. Upon entry, the material first contacts the conical guide surface 8-1, which evenly disperses the concentrated inflow of raw materials axially to the circumferential direction, forming a uniformly distributed downward material flow. The conical surface guides the material to slide radially, gradually transitioning to the fiber cutting zone 8-2 below, achieving material diversion and widening, providing a continuous and evenly distributed raw material channel for subsequent multiple sets of fiber blade bundles. This structure has a triple function of guiding, buffering, and dispersing, and structurally forms a nested, linked, closed cavity with the main cutting device, effectively preventing dust spillage and enhancing feeding stability. Combined with a pneumatic conveying system, material conveying efficiency can be further improved, allowing large-diameter wood fiber raw materials to smoothly transition to the cutting processing area.

[0040] The discharge system of this device is located at the lower end of the central axis of the cutting structure, adopting an integrated design of "central axis guidance + centrifugal suction + gas-solid separation" to achieve continuous and efficient collection and separation of fibrous powder materials. The discharge structure is located in the central area of ​​the fiber cutting device, and the crushed material is concentrated and flows into the central discharge channel along the central guide rail of the cutting cavity. An integrated centrifugal fan 1-4 is located on the left side of this channel, with backward-inclined blades inside. Through high-speed rotation, it forms a stable negative pressure airflow, driving the material in the center of the cutting cavity to be drawn away from the inside to the outside along the axial direction. Compared with the traditional gravity discharge method, this structure has stronger suction capacity and higher conveying efficiency, and is suitable for low-density, easily suspended fine fiber powder. Before the material enters the discharge channel, the system has a classifying wheel 3-1 structure for preliminary screening and control based on particle size. The classifying wheel 3-1 operates at high speed at the cutting end, which can block coarse particles that do not meet the particle size requirements back to the cutting area for secondary shearing, while allowing fine particles to smoothly enter the discharge channel with the airflow. This grading 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 employ a classic conical structure design. The mixed flow enters the inner wall of the cylinder at high speed along the tangential direction. Under centrifugal force, denser solid particles sink along the cone wall and collect at the bottom discharge port; while less dense gas spirals upward along the central axis to the top exhaust port for discharge, thus achieving effective separation of material and carrier gas. This discharge system is compact and has stable suction, enabling efficient transfer, sealed discharge, and separation collection of fibrous powders without relying on gravity transmission. It significantly improves the safety and automation level of the discharge process, making it particularly suitable for continuous pulverization scenarios with high dust concentrations and requiring explosion-proof treatment.

[0042] The entire unit is enclosed by a robust metal shell, forming a multi-stage crushing chamber. It is equipped with a material passage or replaceable sieve to control particle flow direction and size: the coarse crushing module has a large through-hole at the bottom, allowing only crushed material of a certain size to fall into the shearing module; a medium-diameter sieve is installed between the shearing module and the fine grinding module for screening. The bottom of the fine grinding module is the finished product outlet, connecting to the collection chamber or discharge pipe. The upper part of the shell has a feed inlet 7-1, connecting to the aforementioned external feeding pipe; the lower part has a discharge outlet, which can connect to a collection bucket or conveying equipment. To ensure long-term continuous operation, the side walls of the shell are also equipped with multiple sets of heat dissipation louvers or cooling ventilation structures, and the main shaft motor also has a cooling fan, simultaneously providing a certain amount of airflow to the crushing chamber to promptly remove heat and wood dust generated during the crushing process and prevent overheating. For operational safety, a splash guard and feed guide rail can be installed near the feed inlet 7-1. When small pieces of wood are manually fed in, the guide rail can guide the raw material smoothly into the chamber and prevent direct contact with rotating parts.

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

Claims

1. A fiber-cutting device, characterized in that, The device includes a grading wheel and flexible blade bundles. Several feeding gaps are provided on the side wall of the grading wheel. Several support rods are provided 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 each other. Multiple turns 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. Each turn of flexible blade bundle forms a cutter disc. The flexible blade bundles in each turn of flexible blade bundle are arranged at an angle offset along the circumferential direction, and the flexible blade bundles of adjacent turns are offset by a preset angle. Each flexible blade bundle consists of two flexible blade bundles, each of which passes through the support rods at both ends in a serpentine manner, and the two flexible blade bundles intersect. Along the radial direction of the grading wheel, from the outside to the inside, the radial distance between adjacent cutter heads becomes smaller and smaller.

2. The fiber cutting device as described in claim 1, characterized in that, The grading wheel is closed at one end and open at the other end, forming a discharge port.

3. The fiber cutting device as described in claim 1, characterized in that, The flexible blade bundle is composed of several high-performance fiber filaments bundled together side by side.

4. A wood fiber micro / nano crushing device, characterized in that, It includes the fiber blade cutting device and the feeding guide device as described in claim 3.

5. The wood fiber micro / nano crushing device as described in claim 4, characterized in that, The feeding guide device includes a guide cover, a feeding port at one end of the guide cover, a tapered guide surface and an inner shell inside the guide cover, the tapered guide surface at one end of the inner shell, a plurality of holes on the inner shell, and a cutting area formed inside the inner shell.

6. The wood fiber micro / nano crushing device as described in claim 5, characterized in that, The fiber blade cutting device is located within the cutting area and is coaxially arranged with the inner shell.

7. A wood fiber micro / nano crushing system, characterized in that, It includes a multi-stage wood fiber micro-nano crushing device as described in any one of claims 4-6 and a multi-stage cyclone separator; the cyclone separator is located at the rear end of the corresponding wood fiber micro-nano crushing device.

8. The wood fiber micro / nano crushing system as described in claim 7, characterized in that, The high-performance fiber filament is an aramid monofilament. Along the material conveying direction, the diameter of the aramid monofilament in the flexible blade bundle of the preceding wood fiber micro-nano crushing device is larger than the diameter of the aramid monofilament in the flexible blade bundle of the following wood fiber micro-nano crushing device.

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