Biomass breaking system

Abstract

The utility model discloses a kind of biomass crushing system, it is related to biomass crushing equipment technical field, solve the problem of easy jamming, low efficiency and uneven granularity when existing crushing device handles biomass raw material.The technical scheme main point is: system includes the bunker connected in turn, weighing feeder, the crusher with no screen inside and being equipped with rotor and baffle, the screening device with powder and large particle outlet, and the anti-material device for returning large particle to bunker.The system is mainly used for continuously, efficiently preparing the biomass powder of uniform granularity for biomass gasification device.

Description

Technical Field

[0001] This utility model relates to the technical field of biomass crushing equipment. More specifically, this utility model relates to a biomass crushing system. Background Technology

[0002] Currently, there is no crushing device specifically designed for preparing biomass powder for biomass gasification plants. Existing technologies include medium-speed mills specifically for crushing coal, impact crushers for crushing stone, and hammer crushers commonly used in the furniture industry for making particleboard.

[0003] Medium-speed mills feed raw materials in lumps from the top, where they are ground into fine powder by grinding discs at the bottom. Air is then introduced from the bottom for air separation, and qualified material is carried out through the top outlet by the airflow. Medium-speed mills are common in pulverized coal gasification. However, coal is more brittle and easier to grind, while biomass is more ductile and deforms into fibers upon impact, making it difficult to grind. Therefore, the processing capacity of medium-speed mills is significantly reduced when pulverizing biomass. Furthermore, because the pulverized biomass is in flake form, its weight affects the air separation effect, and the greater air resistance faced by the flakes means that large, unqualified pieces may also be carried out.

[0004] Impact crushers are commonly used in the field of stone crushing. They use hammers on the rotor to strike the stone onto the impact plate and bounce it back for further crushing. The gap between the rotor and the impact plate is used to adjust the required particle size. However, since stone is similar to coal and is brittle, it is not easy to crush biomass if the impact crusher is used directly.

[0005] Hammer mills are commonly used in the wood processing and furniture manufacturing industries. The furniture industry often uses particleboard, which requires wood to be crushed into powder. These mills typically have screens and hammers inside. Material is struck against the screen and then re-struck, until it reaches the required particle size before leaving the screen. Because biomass is used in large quantities and requires continuous operation, far exceeding the processing capacity of typical furniture factories, and because biomass contains many impurities such as stones and iron, some of which may be compressed into the particles, the screen may be damaged when struck by the hammers.

[0006] Meanwhile, in the entire crushing system, some parts of the system require induced draft air to extract the powder from the crushing device and then circulate it after the dust is removed by the dust collector. However, biomass raw materials are complex and have varying moisture contents, which may cause water to be released from the induced draft air during the circulation process and clog the filter. Summary of the Invention

[0007] The present invention aims to solve the problems faced by the above-mentioned crushing devices when crushing biomass.

[0008] To achieve these objectives and other advantages according to the present invention, a biomass crushing system is provided, comprising: silos; A weighing feeder is installed below the silo, and its inlet is connected to the outlet of the silo. A crusher is located below the weighing feeder. The feed inlet of the crusher is connected to the outlet of the weighing feeder. The crusher is equipped with a rotor and an impact plate, but has no screen inside. A screening device is installed below the crusher. The inlet of the screening device is connected to the outlet of the crusher. The screening device is provided with a powder outlet and a large particle material outlet. The return material device has its inlet connected to the large particle material outlet of the screening device, and its outlet connected to the feed inlet of the silo.

[0009] Preferably, it also includes a dust control device, which includes an induced draft fan and an induced draft fan filter; The inlet of the induced draft fan is connected to the crusher and / or the screening device to create a negative pressure inside the crusher and / or the screening device; The outlet of the induced draft fan is connected to the induced draft fan filter; The induced draft fan filter is equipped with a clean gas discharge port and a powder collection outlet.

[0010] Preferably, it also includes a powder conveying and storage device, which includes a powder feeding tank, a powder conveying pipeline, a conveying fan, a powder storage tank filter, a powder storage tank, and a conveying fan filter; The powder collection outlet of the induced draft fan filter is connected to the powder conveying pipeline; The inlet of the powder feeding tank is connected to the powder outlet of the screening device, and the outlet of the powder feeding tank is connected to the powder conveying pipeline. The end of the powder conveying pipeline is connected to the inlet of the powder storage tank filter; The powder outlet of the powder storage tank filter is connected to the powder storage tank, and the gas outlet of the powder storage tank filter is connected to the inlet of the conveying fan through the conveying fan filter. The outlet of the conveying fan is connected to the beginning of the powder conveying pipeline to provide conveying power.

[0011] Preferably, it also includes an iron removal device, which is installed on the conveying path between the discharge port of the silo and the inlet of the weighing feeder.

[0012] Preferably, the discharge port of the silo, and / or the outlet of the weighing feeder, and / or the discharge port of the crusher, and / or the powder outlet of the screening device, and / or the outlet of the powder feeding tank, and / or the outlet of the return material device, and / or the powder collection outlet of the induced draft fan filter are provided with rotary feeding devices.

[0013] Preferably, the rotor of the crusher is equipped with blades, and the blade angle is 30°~45°; Furthermore, the position of the counter-attack plate is adjustable to change the gap between it and the blades on the rotor.

[0014] Preferably, the screening device is equipped with a dust cover.

[0015] This utility model has at least the following beneficial effects: This invention, through its unique structural design and system integration, effectively solves many problems encountered in the crushing process of biomass raw materials due to their high toughness, numerous impurities, and tendency to generate dust. The system employs a screenless crusher combined with an adjustable impact plate and specific blade angles, significantly enhancing the cutting and crushing efficiency of fibrous materials, avoiding screen clogging and damage, while ensuring flexible control over the output particle size and stable product quality.

[0016] The integrated dust control and powder conveying and storage system effectively collects and reuses dust generated during production through negative pressure dust extraction and closed pneumatic conveying. This significantly improves the working environment, meets environmental protection requirements, reduces raw material waste, and enhances economic efficiency. Multiple rotary feeders ensure smooth and sealed material flow within the system, guaranteeing stable local pressure environments and laying the foundation for continuous system operation.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the biomass crushing system described in this utility model; Among them, 1 is the silo, 11 is the rotary feeder at the silo outlet, 2 is the iron removal device, 3 is the weighing feeder, 31 is the rotary feeder at the weighing feeder outlet, 4 is the crusher, 41 is the crusher rotor, 411 is the crusher blade, 42 is the crusher impact plate, 43 is the crusher shell, 44 is the crusher inlet, 45 is the crusher outlet, 451 is the rotary feeder at the crusher outlet, 5 is the screening device, 51 is the dust cover, 52 is the rotary feeder at the powder outlet of the screening device, 6 is the powder feeding tank, 61 is the rotary feeder at the powder feeding tank outlet, 7 is the return device, 71 is the rotary feeder at the return device outlet, 81 is the induced draft fan, 82 is the induced draft fan filter, 83 is the rotary feeder at the powder collection outlet of the induced draft fan filter, 91 is the powder conveying pipeline, 92 is the conveying fan, 93 is the powder storage tank filter, 94 is the powder storage tank, and 95 is the conveying fan filter. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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 utility model.

[0021] like Figure 1 As shown, this utility model provides a biomass crushing system, comprising: Silo 1; Weighing feeder 3 is located below the silo 1, and its inlet is connected to the outlet of the silo 1; The crusher 4 is located below the weighing feeder 3. The feed inlet of the crusher 4 is connected to the outlet of the weighing feeder 3. The crusher 4 is equipped with a rotor and an impact plate, but has no screen inside. Screening device 5 is located below the crusher 4. The inlet of the screening device 5 is connected to the outlet of the crusher 4. The screening device 5 is provided with a powder outlet and a large particle material outlet. The return material device 7 has its inlet connected to the large particle material outlet of the screening device 5, and its outlet connected to the feed inlet of the silo 1.

[0022] The feed hopper 1 is the starting part of the system, used to store biomass raw materials to be crushed. If the raw materials are straw-like, such as corn stalks or rice straw, they need to be processed into pellets before entering feed hopper 1. Raw materials such as branches, bark, and reeds can be directly fed into feed hopper 1. Feed hopper 1 is typically designed with a certain capacity to ensure continuous feeding, and its outlet is located at the bottom to facilitate the natural descent of materials by gravity. The structure of feed hopper 1 can be adjusted according to actual needs; for example, a conical bottom can be used to reduce material accumulation.

[0023] The weighing feeder 3 is located below the hopper 1, with its inlet directly connected to the outlet of the hopper 1. The function of the weighing feeder 3 is to precisely control the feeding amount of biomass raw materials, ensuring the stability and efficiency of the crushing process. It monitors the weight of the material in real time through a built-in weighing sensor and adjusts the feeding speed according to preset parameters to avoid excessive or insufficient feeding affecting the subsequent crushing effect.

[0024] The crusher 4 is located below the weighing feeder 3, with its inlet 44 connected to the outlet of the weighing feeder 3. The crusher 4 contains a rotor 41 and an impact plate 42, and has no internal screen. The rotor 41 is typically driven by a motor to rotate at high speed, and is equipped with blades 411 for impacting the biomass raw materials. The impact plate 42 is fixed to the inner wall of the casing, forming a crushing chamber with the rotor 41. After the material enters the crusher 4, it is repeatedly crushed by the high-speed impact of the rotor 41 and the rebound action of the impact plate 42. Because there is no screen, the problem of screens being easily damaged by impurities in traditional crushers 4 is avoided. For example, when processing biomass containing stones or metal impurities, the screenless design effectively reduces equipment failures.

[0025] The screening device 5 is installed below the crusher 4, and its inlet is connected to the discharge port 45 of the crusher 4. The screening device 5 has an internal grading mechanism, such as a vibrating screen or an air classifier, which separates the crushed material into powder and large particles. The powder outlet is used to output products with a qualified fineness, while the large particle outlet is used to discharge larger particles that do not meet the requirements. The screening process can adjust the sorting accuracy as needed to ensure the quality of the powder.

[0026] The inlet of the return material device 7 is connected to the large particle material outlet of the screening device 5, and its outlet is connected to the feed inlet of the silo 1. The return material device 7 typically uses a conveyor belt or screw conveyor to send the screened large particles back to the silo 1 for further crushing. This circular design improves raw material utilization, reduces waste, and ensures uniform particle size of the final powder.

[0027] During operation, biomass raw materials first enter the weighing feeder 3 from the silo 1, and are then precisely weighed and evenly fed into the crusher 4. Inside the crusher 4, the material is crushed by multiple impacts from the rotor and impact plates. Because there is no screen, the crushing process is better suited to the high toughness of biomass. The crushed material falls into the screening device 5; powder is collected and output, while large particles are returned to the silo 1 for reprocessing via the return device 7. The entire system achieves continuous automated operation, improving processing efficiency and product consistency.

[0028] The system's technological advantage lies in its combination of impact crushing principles and a screenless design, effectively solving the crushing challenges posed by the high toughness and numerous impurities of biomass raw materials. The screenless design avoids screen clogging or damage, while the circulating crushing process ensures particle size control, and the weighing feeder guarantees process stability. Compared to traditional equipment, this system is more suitable for large-scale biomass processing, reducing maintenance costs and improving overall reliability.

[0029] Furthermore, the biomass crushing system also includes a dust control device, which includes an induced draft fan 81 and an induced draft fan filter 82; The inlet of the induced draft fan 81 is connected to the crusher 4 and / or the screening device 5, and is used to create a negative pressure inside the crusher 4 and / or the screening device 5. The outlet of the induced draft fan 81 is connected to the induced draft fan filter 82; The induced draft fan filter 82 is equipped with a clean gas discharge port and a powder collection outlet.

[0030] This embodiment further includes a dust control device, which is mainly used to collect and process the dust generated during crushing and screening, thereby improving the working environment and reducing raw material loss.

[0031] The core components of the dust control device include an induced draft fan 81 and an induced draft fan filter 82. The inlet of the induced draft fan 81 is connected to the crusher 4 and the screening device 5 via a pipe. This connection method can connect both devices simultaneously, or select one device to connect depending on the actual working conditions. After the induced draft fan 81 starts, it creates a negative pressure environment inside the crusher 4 or screening device 5 to which it is connected. This negative pressure effectively prevents dust from escaping from gaps or openings in the equipment and draws dust-laden gas into the system.

[0032] The outlet of the induced draft fan 81 is connected to the inlet of the induced draft fan filter 82. The induced draft fan filter 82 is a key gas-solid separation device, typically containing filter elements such as filter bags or filter cartridges. When the airflow containing biomass dust passes through the filter, the dust is trapped on the surface of the filter elements, while the clean gas passes through the filter media. The filter has a clean gas exhaust port, through which the treated, compliant gas is discharged into the atmosphere or subsequently recycled. Simultaneously, the filter also has a dust collection outlet for the centralized discharge of the collected dust.

[0033] In practical applications, such as when a crusher processes dry wood scraps, it generates a large amount of lightweight fibrous dust. The negative pressure created by the induced draft fan within the crushing chamber can promptly draw away this dust, preventing it from spreading into the workshop air. After the dust-laden gas is drawn into the induced draft fan filter, the dust is efficiently captured, allowing clean air to be discharged. The collected biomass powder itself is a valuable product that can be recycled.

[0034] This device offers multifaceted technological benefits. It significantly improves the working environment at the production site, protects the health of operators, and meets environmental protection requirements. Through negative pressure dust extraction, it effectively prevents safety hazards such as dust explosions, enhancing system safety. Simultaneously, by recycling dust as a product, it reduces raw material waste and improves the overall economic efficiency of the production process. This design provides a highly efficient and reliable solution to the characteristics of large quantities and easily dispersed dust generated during biomass crushing.

[0035] Furthermore, the biomass crushing system also includes a powder conveying and storage device, which includes a powder feeding tank 6, a powder conveying pipeline 91, a conveying fan 92, a powder storage tank filter 93, a powder storage tank 94, and a conveying fan filter 95. The powder collection outlet of the induced draft fan filter 82 is connected to the powder conveying pipeline 91; The inlet of the powder feeding tank 6 is connected to the powder outlet of the screening device 5, and the outlet of the powder feeding tank 6 is connected to the powder conveying pipeline 91. The end of the powder conveying pipeline 91 is connected to the inlet of the powder storage tank filter 93; The powder outlet of the powder storage tank filter 93 is connected to the powder storage tank 94, and the gas outlet of the powder storage tank filter 93 is connected to the inlet of the conveying fan 92 through the conveying fan filter 95. The outlet of the conveying fan 92 is connected to the beginning of the powder conveying pipeline 91 to provide conveying power.

[0036] This embodiment further integrates a powder conveying and storage device, which is responsible for safely and efficiently conveying the qualified powder generated by the system to a designated storage tank for storage, thereby realizing a closed-loop and automated production process.

[0037] The core of the powder conveying and storage device is the powder feeding tank 6, whose inlet is connected to the powder outlet of the screening device 5, and is used to receive powder that meets the particle size requirements after screening. As an intermediate buffer container, the powder feeding tank 6 can temporarily store a certain amount of powder and homogenize the material to ensure the stability of subsequent conveying.

[0038] The conveying power is provided by the conveying fan 92, whose outlet is connected to the beginning of the powder conveying pipeline 91. The powder conveying pipeline 91 is a pneumatic conveying network connecting various devices; it acts like the blood vessels of the system, transporting the powder from the front end to the back end. The conveying gas can be nitrogen or carbon dioxide. The end of the powder conveying pipeline 91 is connected to the inlet of the powder storage tank filter 93.

[0039] In addition, the induced draft fan filter 82 can be a bag filter equipped with a back-flushing system. The dust collected by the induced draft fan filter 82 through back-flushing also enters the powder conveying pipeline 91 from the powder collection outlet. This means that the economically valuable powder recovered from the dust control device is reintroduced into the main conveying process, realizing full resource recovery and avoiding waste.

[0040] The outlet of the powder feeding tank 6 is also connected to the powder conveying pipeline 91. Therefore, the fresh powder from the screening device 5 and the recovered dust from the induced draft fan filter 82 are combined in the powder conveying pipeline 91 and transported together to the powder storage tank filter 93 by the airflow provided by the conveying fan 92.

[0041] The powder storage tank filter 93 is a highly efficient gas-solid separation device. When the gas flow carrying powder enters it, the powder is trapped and falls into the powder storage tank 94 through the powder outlet at the bottom for centralized storage. The powder storage tank 94 is the final finished product container, and its capacity can be designed according to the production scale to store biomass powder for later use.

[0042] The gas purified by the powder storage tank filter 93 is discharged through the gas outlet. This gas may still contain extremely fine dust. In order to protect the conveying fan 92 and meet higher environmental protection requirements, the gas will first pass through a conveying fan filter 95 for deep purification before entering the conveying fan 92. After this precision filtration, the clean gas is then drawn into the conveying fan 92, thus forming a complete and clean conveying gas circulation loop.

[0043] During operation, qualified powder and recycled dust are continuously collected in the powder conveying pipeline 91 and then pneumatically blown to the storage tank unit. The entire conveying process is carried out in a closed pipeline, effectively preventing dust leakage and secondary pollution.

[0044] The technological benefits of this device are particularly significant. Through an integrated pneumatic conveying system, it unifies the processing of main products and recycled dust, simplifying the process and improving overall efficiency. The fully enclosed conveying and storage environment fundamentally solves the environmental pollution and product loss problems caused by the lightweight and easily dispersed nature of biomass powder. Simultaneously, the negative pressure circulation design protects the blower equipment, extends its service life, and ensures long-term stable system operation. This device provides reliable technical support for the large-scale, clean, and continuous production and collection of biomass powder.

[0045] Furthermore, the biomass crushing system also includes an iron removal device 2, which is installed on the conveying path between the discharge port of the silo 1 and the inlet of the weighing feeder 3.

[0046] This embodiment adds an iron removal device 2 to the system, which is a crucial element in protecting subsequent critical equipment from damage. The iron removal device 2 is specifically installed on the conveying path between the discharge port of the silo 1 and the inlet of the weighing feeder 3. At this location, the biomass raw material has just been discharged from the silo 1 and has not yet entered the precision weighing and crushing equipment; therefore, separating iron impurities at this point is the most reasonable and effective method.

[0047] Iron removal device 2 typically employs permanent magnet or electromagnetic separators. Permanent magnet separators contain high-strength permanent magnets that generate a strong magnetic field; electromagnetic separators generate a magnetic field through an energized coil, with adjustable magnetic strength that disappears upon power failure, facilitating the removal of adsorbed iron particles. This device can be designed in various structural forms, such as suspended, ducted, or drum types, depending on the material's flow rate and characteristics, for seamless integration into existing conveying processes.

[0048] Its operation is continuous and automatic. When biomass material is discharged from the outlet of silo 1 and flows to the weighing feeder 3 via conveyor belt or chute, it must pass through the area covered by the iron removal device 2. During this process, ferromagnetic impurities mixed in with the biomass, such as nuts, bolts, wires, or nails, are instantly attracted and captured by the strong magnetic field generated by the iron removal device 2, thus being separated from the material flow. The cleaned biomass material then continues to flow downstream to the weighing feeder 3. Operators need to clean the iron removal device 2 regularly, manually or through the automatic iron unloading mechanism, to remove the collected iron impurities and restore its iron removal capacity.

[0049] This design yields significant technical benefits. It directly removes metallic impurities from the raw materials that pose a fatal threat to precision components such as the crusher's rotor blades, greatly reducing the risk of sudden shutdowns or damage due to jamming or impacts, thus ensuring production continuity and stability. Preventative impurity removal reduces equipment maintenance frequency and the cost of replacing vulnerable parts, thereby lowering long-term system operation and maintenance costs. Simultaneously, removing ferrous impurities before they enter the core equipment avoids potential safety hazards caused by sparks generated during collisions and friction in subsequent high-speed equipment, enhancing the overall system's operational safety.

[0050] Furthermore, the discharge port of the silo 1, and / or the outlet of the weighing feeder 3, and / or the discharge port of the crusher 4, and / or the powder outlet of the screening device 5, and / or the outlet of the powder feeding tank 6, and / or the outlet of the return material device 7, and / or the powder collection outlet of the induced draft fan filter 82 are provided with rotary feeding devices.

[0051] This embodiment incorporates rotary feeders at several key material transfer nodes in the system to achieve controllable material transport and effective system sealing. These rotary feeders are specifically located at one or more of the following positions: the discharge port of silo 1, the outlet of weighing feeder 3, the discharge port of crusher 4, the powder outlet of screening device 5, the outlet of powder feeding tank 6, the outlet of return material device 7, and the powder collection outlet of induced draft fan filter 82. These locations are critical interfaces for material flow within the system and are also weak points prone to dust dispersion or air leakage.

[0052] A rotary feeder can be a star-shaped feeder, the core of which is a rotor with multiple blades that rotates within a sealed housing. As the rotor rotates, the cavities between the blades receive material from the upper inlet and then carry it to the lower outlet for discharge. This operating method allows for continuous and stable material transport, while the tight fit between the rotor and the housing effectively blocks airflow, acting as a reliable airlock valve.

[0053] During system operation, the rotary feeder plays a crucial role at each stage. For example, at the outlet of silo 1, it precisely regulates the material flow into the weighing feeder 3 by controlling its rotation speed, preventing material in silo 1 from spilling due to gravity. At the powder collection outlet of the induced draft fan filter 82, since the filter is under negative pressure, the airlock function of the rotary feeder is essential. It prevents external air from being drawn into the filter, thus ensuring the extraction efficiency of the induced draft fan 81 and preventing system airflow imbalance. At the outlet of the powder feeding tank 6, it can evenly feed the powder into the powder conveying pipeline 91, providing stable feeding for the positive pressure pneumatic conveying system, while effectively preventing high-pressure conveying airflow from flowing back into the feeding tank.

[0054] The use of these rotary feeders brings several technical benefits. First, they establish effective seals between various devices through physical isolation, ensuring the stability of local negative or positive pressure environments, which is indispensable for the normal operation of dust control and pneumatic conveying systems. Second, they achieve quantitative and controllable material discharge, providing a foundation for the stable, continuous, and automated operation of the entire system. Finally, by sealing areas prone to dust generation, they significantly reduce fugitive dust emissions from the production site, substantially improve the working environment, and lower the safety risk of dust explosions. This multi-point arrangement of rotary feeders is a crucial guarantee for constructing a highly efficient, closed, and automated biomass crushing system.

[0055] Furthermore, the rotor 41 of the crusher 4 is equipped with blades 411, and the blades 411 have a cutting angle of 30°~45°; Furthermore, the position of the counter-attack plate 42 is adjustable to change the gap between it and the blade 411 on the rotor 41.

[0056] This invention features a targeted design for the core components of the crusher, specifically the blade structure on the rotor and the adjustment mechanism of the impact plate. The rotor, as the main working component, has several blades mounted on its surface. The blade material can be cemented carbide, such as H13 / Cr-Mo-V, or a surface-welded hard layer (HRC≥55). These blades are not traditional hammers or plate hammers; their cutting angle is specially designed between 30° and 45°. This sharp angle design allows the blades to effectively cut and tear tough biomass fibers at high speeds, rather than simply impacting them, making them more suitable for processing biomass raw materials that are easy to filamentize but difficult to crush.

[0057] The rotor is paired with an impact plate, which can also be made of cemented carbide. The impact plate's installation position is designed to be adjustable. Operators can change the gap between the impact plate and the outer edge of the rotor blades using adjusting bolts on the outside of the casing or a hydraulic device. This gap is a key parameter for controlling the output particle size. When finer powder is required, the gap can be reduced, allowing the material to undergo more impacts and grinding within the crushing chamber; when the throughput is large or the particle size requirement is not high, the gap can be appropriately increased to improve throughput.

[0058] During operation, operators can flexibly adjust the system according to the characteristics of different biomass raw materials (such as hardness, moisture content, and fiber length) and the required particle size of the final product. For example, when crushing highly ductile straw-like raw materials, a smaller impact plate gap can be used, combined with blades with sharp cutting edges, to achieve thorough fiber cutting. When processing more brittle wood chips, a slightly larger gap can be used to improve processing efficiency.

[0059] This combined design yields significant technical benefits. The angled blades enhance the cutting ability of biomass materials, effectively overcoming the crushing challenges posed by their toughness and reducing material entanglement and adhesion during the crushing process. The adjustable impact plate provides the crusher 4 with wide material adaptability and flexible discharge particle size control, enabling a single unit to meet diverse process requirements. Because the crusher 4 has no internal screen, it combines cutting and impact crushing principles, avoiding screen clogging and damage while ensuring crushing efficiency, making it particularly suitable for continuous, large-scale production scenarios.

[0060] Furthermore, the screening device 5 is equipped with a dust cover 51.

[0061] In this embodiment, a dust cover 51 is installed on the screening device 5. This structure is crucial for maintaining a clean environment and stable operation within the system. The dust cover 51 is a physical isolation component that completely covers the exterior of the screening device 5, such as a vibrating screen or an air classifier, forming a relatively sealed space. This cover is typically made of sheet metal or transparent engineering plastic, ensuring structural strength while facilitating observation of the internal screening process. Depending on operation and maintenance needs, the dust cover 51 may have inspection doors or observation windows with sealing strips, ensuring both airtightness and maintainability of the equipment.

[0062] When the screening device 5 is in operation, the material inside is thrown up, vibrated, or subjected to airflow, a process that easily leads to the dispersion of fine powdery materials. Without effective sealing measures, this dust will escape from the inlet and outlet of the screening machine and from the gaps in the machine body, polluting the workshop environment. The core function of the dust cover 51 is to confine this dust inside the cover and prevent it from leaking out uncontrollably. For example, when processing dry sawdust, the screening process generates a large amount of visible dust, and the dust cover 51 can effectively control this dust within a localized space.

[0063] During operation, the dust cover 51 works in conjunction with the system's dust control device. The suction port of the induced draft fan 81 is typically directly connected to the upper part or a specific location of the dust cover 51. By creating a stable micro-negative pressure environment inside the cover, the airborne dust generated during screening is continuously drawn away and sent to subsequent filters for treatment. This allows the screening operation to be carried out under controlled conditions, ensuring that even if the internal dust is abundant, the external environment remains clean.

[0064] During operation, the dust cover 51 works in conjunction with the system's dust control device. The suction port of the induced draft fan 81 is typically directly connected to the upper part or a specific location of the dust cover 51. By creating a stable micro-negative pressure environment inside the cover, the airborne dust generated during screening is continuously drawn away and sent to subsequent filters for treatment. This allows the screening operation to be carried out under controlled conditions, ensuring that even if the internal dust is abundant, the external environment remains clean.

[0065] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A biomass crushing system, characterized in that, include: silos; A weighing feeder is installed below the silo, and its inlet is connected to the outlet of the silo. A crusher is located below the weighing feeder. The feed inlet of the crusher is connected to the outlet of the weighing feeder. The crusher is equipped with a rotor and an impact plate, but has no screen inside. A screening device is installed below the crusher. The inlet of the screening device is connected to the outlet of the crusher. The screening device is provided with a powder outlet and a large particle material outlet. The return material device has its inlet connected to the large particle material outlet of the screening device, and its outlet connected to the feed inlet of the silo.

2. The biomass crushing system as described in claim 1, characterized in that, It also includes a dust control device, which includes an induced draft fan and an induced draft fan filter; The inlet of the induced draft fan is connected to the crusher and / or the screening device to create a negative pressure inside the crusher and / or the screening device; The outlet of the induced draft fan is connected to the induced draft fan filter; The induced draft fan filter is equipped with a clean gas discharge port and a powder collection outlet.

3. The biomass crushing system as described in claim 2, characterized in that, It also includes a powder conveying and storage device, which includes a powder feeding tank, a powder conveying pipeline, a conveying fan, a powder storage tank filter, a powder storage tank, and a conveying fan filter; The powder collection outlet of the induced draft fan filter is connected to the powder conveying pipeline; The inlet of the powder feeding tank is connected to the powder outlet of the screening device, and the outlet of the powder feeding tank is connected to the powder conveying pipeline. The end of the powder conveying pipeline is connected to the inlet of the powder storage tank filter; The powder outlet of the powder storage tank filter is connected to the powder storage tank, and the gas outlet of the powder storage tank filter is connected to the inlet of the conveying fan through the conveying fan filter. The outlet of the conveying fan is connected to the beginning of the powder conveying pipeline to provide conveying power.

4. The biomass crushing system according to any one of claims 1 to 3, characterized in that, It also includes an iron removal device, which is installed on the conveying path between the discharge port of the silo and the inlet of the weighing feeder.

5. The biomass crushing system as described in claim 3, characterized in that, The discharge port of the silo, and / or the outlet of the weighing feeder, and / or the discharge port of the crusher, and / or the powder outlet of the screening device, and / or the outlet of the powder feeding tank, and / or the outlet of the return material device, and / or the powder collection outlet of the induced draft fan filter are provided with rotary feeding devices.

6. The biomass crushing system as described in claim 1, characterized in that, The rotor of the crusher is equipped with blades, and the blade angle is 30°~45°; Furthermore, the position of the counter-attack plate is adjustable to change the gap between it and the blades on the rotor.

7. The biomass crushing system as described in claim 1, characterized in that, The screening device is equipped with a dust cover.

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