An automatic screening and preparation biomass fuel production line for agricultural and forestry wastes

Abstract

This invention relates to the field of agricultural and forestry waste resource utilization technology, and proposes an automated screening and biomass fuel production line for agricultural and forestry waste. The line includes a chain feeder, a belt conveyor, a primary crusher, a magnetic separation conveyor belt mechanism, a manual sorting platform, a secondary crusher, a belt feeder, a drum screen, an air separator, a primary feeding belt, a briquetting machine, and a secondary feeding belt. The magnetic separation conveyor belt mechanism is equipped with magnetic rollers, scrapers, and a collection box, which can clean and recover metal impurities and deposits attached to the bottom of the conveyor belt. Through this technical solution, continuous feeding, grading, crushing, magnetic separation, manual sorting, screening, air separation, and classification of agricultural and forestry waste are achieved, solving the problems of insufficient impurity removal, poor processing continuity, and negative impacts on the quality and efficiency of biomass fuel production from existing equipment.

Description

Technical Field

[0001] This invention relates to the field of agricultural and forestry waste resource utilization technology, specifically to an automated screening and biomass fuel production line for agricultural and forestry waste. Background Technology

[0002] Agricultural and forestry waste mainly includes straw, branches, sawdust, fruit shells, and pruning residues. It has a wide range of sources and a large output; improper disposal can easily lead to resource waste and environmental burden. With the development of biomass energy utilization technology, collecting, crushing, screening, and further preparing agricultural and forestry waste into biomass fuel blocks or pellets has become an important way to improve the resource utilization rate of agricultural and forestry waste. In existing technologies, agricultural and forestry waste is typically processed using conveying equipment, crushing equipment, screening equipment, and forming equipment to meet the requirements for subsequent fuel utilization.

[0003] However, existing agricultural and forestry waste treatment equipment still has certain shortcomings in practical applications. On the one hand, agricultural and forestry waste often contains iron nails, iron wires, metal fragments, and other foreign objects. If these cannot be separated in time during transportation and crushing, they can easily cause wear, blockage, or decreased operational stability of subsequent crushing, screening, and molding equipment. On the other hand, existing treatment equipment lacks seamless integration in stages such as feeding adjustment, magnetic separation for impurity removal, manual sorting, particle size screening, and classification of light and heavy materials. This makes it difficult to achieve continuous and graded treatment, resulting in low purity of agricultural and forestry waste, poor screening effect, and affecting the final quality and production efficiency of biomass fuel. Therefore, it is necessary to provide an automated screening and biomass fuel production line capable of continuous transportation, grading and crushing, magnetic separation for impurity removal, manual sorting, screening, and classification and molding of agricultural and forestry waste. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides an automatic screening production line for agricultural and forestry waste to prepare biomass fuel, which solves the problems of insufficient impurity removal, poor processing continuity, and impact on the quality and efficiency of biomass fuel preparation in the prior art.

[0005] According to one aspect, at least one embodiment of the present invention provides an automated screening and biomass fuel production line for agricultural and forestry waste, comprising: A chain plate feeder is used for conveying and feeding agricultural and forestry waste. A belt conveyor, wherein the feed end of the belt conveyor is connected to the discharge end of the chain plate feeder, is used to lift and transport agricultural and forestry waste; The No. 1 crusher is connected at its feed end to the discharge end of the belt elevator and is used for the preliminary crushing of agricultural and forestry waste. A magnetic separation conveyor belt mechanism, wherein the feed end of the magnetic separation conveyor belt mechanism is connected to the discharge end of the No. 1 crusher, is used to perform magnetic separation and impurity removal on the pre-crushed agricultural and forestry waste and to convey it. A manual sorting platform is located on the outer middle of the magnetic separation conveyor belt mechanism and is used to sort agricultural and forestry waste. The No. 2 crusher is connected at its feed end to the discharge side of the magnetic separation conveyor belt mechanism and is used to crush the sorted agricultural and forestry waste again. A belt feeder, the feed end of which is connected to the discharge end of the second crusher, is used to transport agricultural and forestry waste that has been crushed again. A rotary drum screen, the feed end of which is connected to the discharge end of the belt conveyor, is used to screen agricultural and forestry waste after it has been crushed again. An air separation device is located downstream of the drum screen and is used to remove impurities from the screened coarse agricultural and forestry waste by air separation. The No. 1 feeding belt is located at the discharge port at the bottom of the drum screen and is used to transport the screened fine agricultural and forestry waste. A briquetting machine, wherein the feed end of the briquetting machine is connected to the light material discharge port of the air separation equipment, is used to compress the screened light-weight agricultural and forestry waste into biomass fuel blocks; The second feeding belt is located below the heavy material outlet in the middle of the air separation equipment. The second feeding belt is used to transport the screened heavy agricultural and forestry waste to the subsequent fine powder mill and pellet mill to make biomass fuel pellets.

[0006] For example, in an automatic screening and biomass fuel production line for agricultural and forestry waste provided by at least one embodiment of the present invention, the chain plate feeder includes a first frame and a chain plate feeding belt, and a first drive motor for driving the chain plate feeding belt to rotate is installed on one side of the first frame; The chain plate feeder is rotatably mounted on the top of the No. 1 frame, and a feeding hopper is installed above the chain plate feeder; The feeding hopper is equipped with a material control mechanism on one side of the discharge end.

[0007] For example, in an automatic screening and biomass fuel production line for agricultural and forestry waste provided by at least one embodiment of the present invention, the material control mechanism includes a threaded knob rotatably mounted on the top horizontal plate of the feeding hopper, and a screw block is screwed onto the threaded knob; A baffle is fixed to one side of the screw block; The baffle is slidably inserted between the inner side walls of the feeding hopper.

[0008] For example, in an automatic screening and biomass fuel production line for agricultural and forestry waste provided in at least one embodiment of the present invention, the No. 1 crusher includes a No. 2 frame, and a crushing box is fixed in the middle of the No. 2 frame; The crushing box is symmetrically equipped with crushing rollers, and a second drive motor for driving the crushing rollers to rotate is fixed on the outside of the crushing box. A feed hopper is fixed at the top of the crushing box. The No. 2 pulverizer has the same structure as the No. 1 pulverizer.

[0009] For example, in an automatic screening production line for preparing biomass fuel from agricultural and forestry waste provided in at least one embodiment of the present invention, the magnetic separation conveyor belt mechanism includes a mounting frame, and lifting support legs are fixed on both sides of the bottom of the mounting frame. Several evenly distributed conveyor rollers are rotatably installed inside the mounting frame. A conveyor belt is wound around the outer periphery of several of the conveyor rollers, and some of the conveyor rollers located on the discharge port side are magnetic rollers. A power motor for driving the conveyor belt to rotate is installed on the mounting frame. The top of the mounting frame is fixed with a barrier; The bottom end of the lifting support leg is fixed with a roller with a brake pad.

[0010] For example, in an automatic screening and biomass fuel production line for agricultural and forestry waste provided in at least one embodiment of the present invention, the lifting support leg is a hydraulic cylinder support leg or an electric push rod support leg.

[0011] For example, in an automatic screening and biomass fuel production line for agricultural and forestry waste provided by at least one embodiment of the present invention, the manual sorting platform includes a platform body, the platform body is located in the middle of the outer side of the magnetic separation conveyor belt mechanism, workstations are opened on both sides of the platform body, and a storage cavity is opened inside the platform body; A storage box with a handle is inserted into the storage cavity, and a scraper is fixed on one side of the storage cavity; The top of the scraper is in contact with the bottom wall of the conveyor belt.

[0012] For example, in an automatic screening production line for preparing biomass fuel from agricultural and forestry waste provided in at least one embodiment of the present invention, the air separation equipment includes a No. 3 frame, a conveyor belt is installed on the No. 3 frame, an air separator body is arranged on the right side of the No. 3 frame, and a baffle plate is installed above the conveyor belt on the No. 3 frame.

[0013] The beneficial effects of the embodiments of the present invention are as follows: 1. This invention, through the arrangement of a chain plate feeder, belt elevator, No. 1 crusher, magnetic separation conveyor belt mechanism, manual sorting platform, No. 2 crusher, belt feeder, drum screen, air separation equipment, briquetting machine, and feeding belt, enables agricultural and forestry waste to sequentially complete feeding, lifting, preliminary crushing, magnetic separation for impurity removal, manual sorting, secondary crushing, screening, air separation, and classification and shaping, thereby forming a continuous and systematic production line. This is beneficial to improving the automation level and overall processing efficiency of agricultural and forestry waste resource utilization. A material control mechanism is installed at the feeding hopper of the chain plate feeder. Through the cooperation of threaded knobs, screw blocks, and baffles, the opening of the feeding hopper outlet can be adjusted, thereby controlling the amount of material entering the chain plate feeder belt. This avoids excessive instantaneous feeding that could cause blockage of subsequent equipment, while ensuring the stability of the feeding, which is beneficial to improving the continuity and uniformity of the entire line operation.

[0014] 2. In this invention, by installing a magnetic roller in the magnetic separation conveyor belt mechanism, magnetic impurities such as iron nails, iron wires, and metal fragments mixed in agricultural and forestry waste can be adsorbed onto the surface of the conveyor belt. As the conveyor belt rotates to the bottom, these impurities, after escaping the magnetic field of the roller, fall into the collection box under their own gravity for centralized collection. This effectively separates magnetic metal impurities, reducing the possibility of them entering subsequent equipment, thus reducing equipment wear and improving the quality of subsequent processing. Simultaneously, a scraper and collection box are installed in the manual sorting platform. The scraper is fitted against the bottom wall of the conveyor belt, allowing metal fragments and adhering debris attached to the bottom surface to be scraped off promptly during the conveyor belt's circulation, and collected in the collection box. This helps maintain the cleanliness of the conveyor belt's bottom surface, reducing the impact of residual impurities on the conveying process, and also helps maintain the stable operation of the magnetic separation conveyor belt mechanism. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0016] Figure 1 This is a perspective view of the external structure of the present invention; Figure 2 This is a three-dimensional structural view of the chain plate feeder in this invention; Figure 3 This is a three-dimensional structural view of the No. 1 pulverizer in this invention; Figure 4 This is a perspective view of the magnetic separation conveyor belt mechanism in this invention; Figure 5This is a three-dimensional view of the manual sorting platform structure in this invention; Figure 6 This is a three-dimensional structural view of the air separation device in this invention; In the diagram: 1. Chain feeder; 101. Frame 1; 102. Chain feed belt; 103. Drive motor 1; 104. Feed hopper; 105. Threaded knob; 106. Screw block; 107. Baffle; 2. Belt elevator; 3. Crusher 1; 301. Frame 2; 302. Crushing box; 303. Crushing roller; 304. Drive motor 2; 305. Feed hopper; 4. Magnetic separation conveyor belt mechanism; 401. Mounting frame; 402. Lifting support leg; 403. Conveyor belt; 404. Enclosure; 405. Roller; 5. Manual sorting platform; 501. Platform body; 502. Workstation; 503. Scraper; 504. Storage box; 505. Handle; 6. No. 2 crusher; 7. Belt feeder; 8. Rotary drum screen; 9. Air classifier; 901. No. 3 frame; 902. Conveyor belt; 903. Baffle plate; 904. Air classifier body; 10. No. 1 feeding belt; 11. Briquetting machine; 12. No. 2 feeding belt. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 the present invention.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Example

[0024] This embodiment provides an automated screening and biomass fuel production line for agricultural and forestry waste, such as... Figures 1 to 6 As shown, it includes a chain plate feeder 1, a belt elevator 2, a first crusher 3, a magnetic separation conveyor belt mechanism 4, a manual sorting platform 5, a second crusher 6, a belt feeder 7, a drum screen 8, an air classifier 9, a first feeding belt 10, a briquetting machine 11, and a second feeding belt 12.

[0025] The chain plate feeder 1 is located at the front end of the entire production line, used to receive raw agricultural and forestry waste and complete the initial feeding. The chain plate feeder 1 includes a first frame 101 and a chain plate feeding belt 102. The first frame 101 provides overall support, and the chain plate feeding belt 102 is rotatably mounted on top of the first frame 101 to continuously transport the agricultural and forestry waste from the inlet to the outlet. A first drive motor 103 is installed on one side of the first frame 101, which outputs power to drive the chain plate feeding belt 102 to circulate. A feeding hopper 104 is installed above the chain plate feeding belt 102. The feeding hopper 104 is used to collect the input branches, straw, wood chips, fruit shells, and other agricultural and forestry waste, and stably guide the material onto the chain plate feeding belt 102.

[0026] Furthermore, a material control mechanism is installed on one side of the feeding hopper 104 at the discharge end. The material control mechanism includes a threaded knob 105 rotatably mounted on the top horizontal plate of the feeding hopper 104. A screw block 106 is screwed onto the threaded knob 105, and a baffle 107 is fixed to one side of the screw block 106. The baffle 107 is slidably inserted between the inner walls of the feeding hopper 104. In actual use, by rotating the threaded knob 105, the screw block 106 can be moved along the thread direction, thereby driving the baffle 107 to adjust its position up and down inside the feeding hopper 104, thus changing the effective opening of the discharge port. In this way, the amount of material entering the chain conveyor belt 102 can be controlled, avoiding blockage of subsequent equipment due to excessive instantaneous discharge, and also preventing a reduction in the overall processing efficiency due to insufficient discharge.

[0027] The discharge end of the chain feeder 1 is connected to the feed end of the belt elevator 2. The belt elevator 2 is used to lift the agricultural and forestry waste after preliminary homogenization and transport it to the feed position of the No. 1 crusher 3 to meet the installation height requirements of the subsequent crushing equipment, while reducing the accumulation of material between the front and rear equipment, so that the material can be transported continuously and stably.

[0028] The No. 1 crusher 3 is located downstream of the discharge end of the belt elevator 2 and is used for the preliminary crushing of agricultural and forestry waste. The No. 1 crusher 3 includes a second frame 301, with a crushing box 302 fixed in the middle of the second frame 301. Crushing rollers 303 are symmetrically installed inside the crushing box 302, and a second drive motor 304 is fixed to the outside of the crushing box 302. The second drive motor 304 outputs power to drive the crushing rollers 303 to rotate. A feed hopper 305 is fixed to the top of the crushing box 302. The agricultural and forestry waste delivered by the belt elevator 2 first enters the crushing box 302 through the feed hopper 305, and is then squeezed, sheared, and crushed by the two sets of crushing rollers 303, thereby breaking larger branches, straw bundles, or plate-shaped fragments into granules or short sections suitable for subsequent impurity removal and screening. By setting up the No. 1 crusher 3, the particle size of the original agricultural and forestry waste can be made more uniform, creating conditions for subsequent magnetic separation, manual sorting, and further crushing.

[0029] The discharge end of the No. 1 crusher 3 is connected to the feed end of the magnetic separation conveyor belt mechanism 4. The magnetic separation conveyor belt mechanism 4 includes a mounting frame 401, with lifting support legs 402 fixed on both sides of the bottom of the mounting frame 401. Several evenly distributed conveyor rollers are rotatably mounted inside the mounting frame 401, and a conveyor belt 403 is wound around the outer circumference of the conveyor rollers. A power motor for driving the rotation of the conveyor belt 403 is mounted on the mounting frame 401. Some of the conveyor rollers located on the discharge port side are magnetic rollers. When the material output from the No. 1 crusher 3 falls onto the conveyor belt 403, the material is conveyed forward with the conveyor belt 403. When it approaches the discharge end, magnetic impurities such as iron nails, iron wires, and metal fragments mixed in with agricultural and forestry waste are attracted to the surface of the conveyor belt 403 under the action of the magnetic rollers, and move from the upper conveying section to the bottom position of the conveyor belt 403 as the conveyor belt 403 rotates. When the magnetic impurities travel along the conveyor belt 403 to a position where they are no longer under the influence of the magnetic field of the magnetic roller, the magnetic attraction disappears, and these magnetic impurities fall downwards under their own gravity and are collected in the collection box 504 in the manual sorting platform 5. Thus, the magnetic separation conveyor belt mechanism 4 can not only automatically separate magnetic metal impurities from agricultural and forestry waste, but also achieve centralized collection of impurities with the help of the collection box 504 set in the manual sorting platform 5.

[0030] This achieves preliminary magnetic separation and impurity removal of the material. A barrier 404 is fixed to the top of the mounting frame 401. The barrier 404 restricts the lateral scattering of material during conveying, improving conveying stability and reducing spillage on site. Rollers 405 with brake pads are fixed to the bottom of the lifting support legs 402, facilitating the movement of the magnetic separation conveyor belt mechanism 4 during installation, commissioning, or maintenance. Once the equipment is in place, it can be locked in place by the brake pads of the rollers 405, ensuring stability during operation.

[0031] In this embodiment, the lifting support leg 402 is a hydraulic cylinder type support leg. The hydraulic cylinder type support leg can adjust the overall height of the mounting frame 401, creating a smoother material drop relationship between the feed end of the magnetic separation conveyor belt mechanism 4 and the discharge end of the first crusher 3, and between the discharge end and the feed end of the second crusher 6. It can also be adapted to the working height of the manual sorting platform 5, thereby improving the flexibility of the entire line layout. For different site conditions or auxiliary equipment of different specifications, the hydraulic cylinder type support leg can achieve good installation coordination.

[0032] The manual sorting platform 5 is located on the outer center of the magnetic separation conveyor belt mechanism 4. The manual sorting platform 5 includes a platform body 501, with workstations 502 on both sides of the platform body 501. A storage cavity is formed inside the platform body 501, and a storage box 504 with a handle 505 is inserted into the storage cavity. A scraper 503 is fixed to one side of the storage cavity, with the top of the scraper 503 abutting against the bottom wall of the conveyor belt 403. During use, operators can stand at workstations 502 to further manually sort the crushed material, separating impurities unsuitable for subsequent biomass fuel production. Since the magnetic separation conveyor belt mechanism 4 mainly removes magnetic impurities, and agricultural and forestry waste may still contain non-magnetic foreign matter, the manual sorting platform 5 can further improve the purity of the raw materials. Meanwhile, the scraper 503 adheres to the bottom wall of the conveyor belt 403. When the conveyor belt 403 is running in a cycle, metal shavings or adhesive debris attached to the bottom wall of the conveyor belt can be scraped off by the scraper 503 and enter the corresponding collection box 504 for easy centralized cleaning and to reduce material accumulation at the bottom of the equipment. The collection box 504 can be pulled out of the collection cavity via the handle 505, thereby achieving quick cleaning and reuse.

[0033] The material, after magnetic separation and manual sorting, continues to be conveyed to the second crusher 6. The feed end of the second crusher 6 is connected to the discharge side of the magnetic separation conveyor belt mechanism 4, and is used to further crush the sorted agricultural and forestry waste. The second crusher 6 can adopt the same structural form as the first crusher 3, that is, including components such as frame, crushing box, crushing roller and drive motor. By setting a two-stage crushing structure, the particle size of the material can be further refined and tend to be uniform, which is beneficial to the effective screening of the subsequent drum screen 8, and also to obtaining more stable molding raw materials for the subsequent briquetting and granulation processes.

[0034] The discharge end of the second crusher 6 is connected to the feed end of the belt feeder 7, which is used to stably transport the re-crushed agricultural and forestry waste to the drum screen 8. The feed end of the drum screen 8 is connected to the discharge end of the belt feeder 7, and it is mainly used to screen the re-crushed agricultural and forestry waste. After the material enters the drum screen 8, the smaller-sized fine agricultural and forestry waste falls through the screen holes and is transported by the first feeding belt 10 located at the discharge port at the bottom of the drum screen 8 to a designated location for collection or subsequent processing; the coarser agricultural and forestry waste that fails to pass through the screen holes is discharged from the downstream of the drum screen 8 and enters the air classifier 9 for further sorting.

[0035] The air separator 9 is located downstream of the drum screen 8 and is used to remove impurities from the screened coarse agricultural and forestry waste. The air separator 9 includes a third frame 901, on which a conveyor belt 902 is mounted. The air separator body 904 is located on the right side of the third frame 901, and a baffle plate 903 is installed above the conveyor belt 902 on the third frame 901. The coarse agricultural and forestry waste entering the air separator 9 first falls onto the conveyor belt 902. During conveying, it is subjected to the airflow generated by the air separator body 904. Materials with lower density and lighter texture move along different trajectories under the influence of the airflow, and are discharged from different outlets. The baffle plate 903, located above the conveyor belt 902, restricts the material's trajectory, preventing excessive material deviation during air separation and improving the stability and accuracy of the separation.

[0036] The light material outlet of the air classifier 9 is connected to the feed end of the briquetting machine 11. The light agricultural and forestry waste obtained by air classification is fed into the briquetting machine 11 and is made into biomass fuel briquettes under the pressing action of the briquetting machine 11. This part of the material usually has good fiber properties and compressibility, and is easy to store, transport and use as fuel after briquetting.

[0037] Below the heavy material outlet in the middle of the air separator 9, there is a second feeding belt 12. The second feeding belt 12 is used to transport the screened heavy agricultural and forestry waste to the subsequent fine powder mill and granulator to produce biomass fuel pellets. Since the heavy material usually differs from the light material in terms of particle size, density, or impurity characteristics, it is discharged separately by the second feeding belt 12, which is beneficial for subsequent processing with more suitable fine powder and granulation processes.

[0038] The working process of this embodiment is as follows: the raw agricultural and forestry waste first enters the chain plate feeder 1 through the feeding hopper 104, and the feeding is stable under the adjustment of the material control mechanism; then it is lifted and conveyed by the belt elevator 2 to the No. 1 crusher 3 for preliminary crushing; the material after preliminary crushing enters the magnetic separation conveyor belt mechanism 4, and magnetic impurities are removed under the conveying of the conveyor belt 403 and the action of the magnetic roller; after further removal of non-magnetic impurities by the manual sorting platform 5, the material enters the No. 2 crusher 6 for further crushing; the material after further crushing is conveyed by the belt feeder 7 to the drum screen 8 for particle size screening, the fine material is discharged by the No. 1 feeding belt 10, and the coarse material enters the air classifier 9; in the air classifier 9, the coarse material is separated into light mass components and heavy mass components, of which the light mass components enter the briquetting machine 11 to make biomass fuel blocks, and the heavy mass components are conveyed by the No. 2 feeding belt 12 to the subsequent fine powder and granulation process to make biomass fuel pellets. Thus, the entire production line can realize continuous feeding, grading and crushing, magnetic separation, manual sorting, screening, air separation, as well as briquetting and granulation of agricultural and forestry waste.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automated production line for screening and preparing biomass fuel from agricultural and forestry waste, characterized in that, include: Chain plate feeder (1), the chain plate feeder (1) is used for conveying and feeding agricultural and forestry waste; The belt elevator (2) is connected to the discharge end of the chain plate feeder (1) for lifting and conveying agricultural and forestry waste. The No. 1 crusher (3) is connected to the discharge end of the belt elevator (2) for preliminary crushing of agricultural and forestry waste. The magnetic separation conveyor belt mechanism (4) is connected to the discharge end of the No. 1 crusher (3) for magnetic separation and impurity removal and conveying of the pre-crushed agricultural and forestry waste. Manual sorting platform (5), the manual sorting platform (5) is set in the middle of the outer side of the magnetic separation conveyor belt mechanism (4), and is used to sort agricultural and forestry waste; The No. 2 crusher (6) is connected to the discharge side of the magnetic separation conveyor belt mechanism (4) at its feed end, and is used to crush the sorted agricultural and forestry waste again. The belt feeder (7) is connected to the discharge end of the second crusher (6) and is used to transport agricultural and forestry waste that has been crushed again. A rotary drum screen (8) is connected at its feed end to the discharge end of the belt feeder (7) and is used to screen agricultural and forestry waste after it has been crushed again. Air separation device (9), which is located downstream of the drum screen (8), is used to air separate and remove impurities from the screened coarse agricultural and forestry waste; The No. 1 feeding belt (10) is located at the discharge port at the bottom of the drum screen (8). The No. 1 feeding belt (10) is used to transport the fine agricultural and forestry waste after screening. A briquetting machine (11) is connected to the light material outlet of the air separation device (9) at its feed end, and is used to compress the screened light-weight agricultural and forestry waste into biomass fuel blocks. The second feeding belt (12) is located below the heavy material outlet in the middle of the air separation equipment (9). The second feeding belt (12) is used to transport the screened heavy agricultural and forestry waste to the subsequent fine powder mill and pellet mill to make biomass fuel pellets.

2. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 1, characterized in that, The chain plate feeder (1) includes a first frame (101) and a chain plate feeding belt (102). A first drive motor (103) for driving the chain plate feeding belt (102) to rotate is installed on one side of the first frame (101). The chain plate feed belt (102) is rotatably mounted on the top of the first frame (101), and a feeding hopper (104) is installed above the chain plate feed belt (102). The feeding hopper (104) is equipped with a material control mechanism on one side of the discharge end.

3. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 2, characterized in that, The material control mechanism includes a threaded knob (105) rotatably mounted on the top horizontal plate of the feeding hopper (104), and a screw block (106) is screwed onto the threaded knob (105). A baffle (107) is fixed on one side of the screw block (106); The baffle (107) is slidably inserted between the inner side walls of the feeding hopper (104).

4. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 1, characterized in that, The No. 1 crusher (3) includes a No. 2 frame (301), and a crushing box (302) is fixed in the middle of the No. 2 frame (301). The crushing box (302) is symmetrically equipped with crushing rollers (303), and a second drive motor (304) for driving the crushing rollers (303) to rotate is fixed on the outside of the crushing box (302). A feed hopper (305) is fixed on the top of the crushing box (302). The No. 2 crusher (6) has the same structure as the No. 1 crusher (3).

5. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 1, characterized in that, The magnetic separation conveyor belt mechanism (4) includes a mounting frame (401), and lifting support legs (402) are fixed on both sides of the bottom of the mounting frame (401). Several evenly distributed conveyor rollers are rotatably installed inside the mounting frame (401). A conveyor belt (403) is wound around the outer periphery of several of the conveyor rollers, and some of the conveyor rollers located on the discharge port side are magnetic rollers. A power motor for driving the conveyor belt (403) to rotate is installed on the mounting frame (401). The top of the mounting bracket (401) is fixed with a guardrail (404). The bottom end of the lifting support leg (402) is fixed with a roller (405) with a brake pad.

6. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 5, characterized in that, The lifting support leg (402) is a hydraulic cylinder support leg or an electric push rod support leg.

7. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 5, characterized in that, The manual sorting platform (5) includes a platform body (501), which is located in the middle of the outer side of the magnetic separation conveyor belt mechanism (4). Workstations (502) are provided on both sides of the platform body (501), and a storage cavity is provided inside the platform body (501). A storage box (504) with a handle (505) is inserted into the storage cavity, and a scraper (503) is fixed on one side of the storage cavity. The top of the scraper (503) is in contact with the bottom wall of the conveyor belt (403).

8. The automatic screening and biomass fuel production line for agricultural and forestry waste as described in claim 1, characterized in that, The air classifier (9) includes a third frame (901), a conveyor belt (902) is installed on the third frame (901), an air classifier body (904) is provided on the right side of the third frame (901), and a baffle plate (903) is installed above the third frame (901) corresponding to the conveyor belt (902).

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