Processing method for producing fibers for medium-density fiberboards by utilizing forestry and agricultural residues

Abstract

The invention relates to the technical field of fiberboard preparation, and particularly discloses a processing method for producing fibers for medium-density fiberboards by utilizing forestry and agricultural residues, the processing method sequentially comprises three steps of material steam softening treatment, material shredding and material grinding, and the three steps are completed based on a processing device; the processing device comprises a steam treatment unit, a shredding unit, a grinding unit and a steam generator; straw materials in the agricultural and forestry waste are sequentially subjected to steam softening, shredding and grinding processing treatment through the specially-designed processing device, prepared fiber powder can be used for producing and preparing medium-density fiberboards, resource recycling of the agricultural and forestry waste is achieved, energy consumption is reduced through the whole processing device, and the production cost is reduced. The machining cost is reduced, and the operation stability of the whole device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fiberboard preparation, and specifically discloses a processing method for producing fibers for medium-density fiberboard by utilizing agricultural and forestry wastes. Background Art

[0002] The recycling of agricultural and forestry waste is the key research direction of the wood-based panel industry. Corn, sorghum and other straw materials in agricultural and forestry waste are processed into fiber powder after a series of treatments, and then the fiber powder can be prepared into fiberboard after mixing with glue, paving and hot pressing. The traditional method of preparing straw into fiber powder is to use a hot mill, but the existing hot mill has problems such as high energy consumption and grinding and material blockage when processing straw.

[0003] The invention patent with application number 201410774745.3 discloses a method for manufacturing crop straw fiberboard, which includes first pounding the straw, then conveying the crushed material by a horizontal steamer, softening it by high-temperature steam during the conveying process, and finally conveying the steam-treated crushed material into a hot mill for grinding to obtain fiber powder material for fiberboard. However, there are some shortcomings in the equipment used in the invention patent: first, when the horizontal steamer in the patent steams the material, the high-temperature steam is conveyed from one end to the other end, and then directly discharged from the top, resulting in serious waste of steam and excessive energy consumption of the equipment; second, the crushed material after steam softening treatment in the equipment is directly added to the hot mill for grinding, and the size of the crushed material is between 10mm and 40mm at this time, and the water content of the crushed material after steam treatment is high, which easily leads to poor material discharge in the millstone discharge channel, leading to the problem of material discharge blockage before grinding, and frequent shutdown is required for treatment. Therefore, in view of the above-mentioned shortcomings of the existing crop straw fiberboard manufacturing method, the present application proposes a processing device that can effectively solve the above-mentioned technical problems, and based on the processing device, agricultural and forestry waste is processed into fiber material for medium-density fiberboard. Summary of the invention

[0004] The present invention aims to provide a processing method and a corresponding processing device for producing fibers for medium-density fiberboard using agricultural and forestry wastes, thereby realizing the processing of agricultural and forestry wastes into fiber materials for medium-density fiberboards.

[0005] The present invention is achieved through the following technical solutions: A processing method for producing medium-density fiberboard fibers from agricultural and forestry wastes includes three steps of material cutting, steam softening, material shredding and screening, and material grinding, and the three steps are completed based on a processing device, specifically including the following steps: S1: Cut the agricultural and forestry straw into pieces for later use; S2: sending the straw chips into the steam generator for high temperature softening treatment; S3: sending the steam-softened straw shreds into a shredding unit for shredding and screening to obtain straw shreds; S4: sending the shredded straw material into a grinding unit for grinding to obtain fiber material for medium density fiberboard.

[0006] The processing device comprises a steam processing unit, a shredding unit, a grinding unit and a steam generator, the steam processing unit comprises a feeding barrel and a feeding hopper, the feeding hopper is connected to the inclined lower end of the feeding barrel, the inclined upper end of the feeding barrel is connected to the shredding unit, a steam jacket is arranged on the outside of the feeding barrel, a connecting hole connected to the steam jacket is arranged on the upper end of the feeding barrel, a drain pipe is connected to the lower end of the steam jacket, a hollow shaft is rotatably arranged in the feeding barrel, and spiral blades are arranged on the outer circumferential surface of the hollow shaft, the two ends of the hollow shaft extending out of the feeding barrel are respectively connected to a conveying motor and a steam generator, and a steam discharge hole is arranged on the hollow shaft located at the lower half of the feeding barrel; The shredding unit comprises a shredding cylinder, a sealing bucket connected to a feeding cylinder is arranged at a side end of the shredding cylinder, sieve holes are arranged on an outer circumferential surface of the shredding cylinder, and a plurality of arc-shaped cutting knives are arranged at equal intervals along the axial direction on an inner wall of the shredding cylinder above the sieve holes, a shredding roller is rotatably arranged inside the shredding cylinder, and a plurality of rows of shredding teeth are evenly arranged on the roller body of the shredding roller in a circumferential direction, and a feeding mechanism connected to a grinding unit is arranged at the lower end of the shredding cylinder.

[0007] The processing device disclosed in the present invention can sequentially realize the three steps of steam softening, shredding and grinding of straw fragments, wherein during operation, the steam processing unit discharges high-temperature steam into the lower half of the inner cavity of the feed barrel through the steam discharge holes on the hollow shaft, so that the steam is transported upward synchronously with the straw fragments, and is fully contacted with the straw fragments to soften them during the transportation process. Subsequently, after the straw fragments are discharged, the remaining steam enters the steam jacket on the outside through the connecting hole, so that the overflowed steam is used to heat and keep the feed barrel warm, so as to ensure the steam softening treatment effect of the straw fragments, so that the steam thermal energy is fully utilized and excessive heat loss is avoided.

[0008] At the same time, the processing device in this patent also adds a shredding unit between the steam treatment unit and the grinding unit. When the straw fragments after steam softening treatment enter the sealing bucket, they will be accumulated at the lower end close to the shredding roller. Then, during the rotation of the shredding roller, the straw fragments can be processed into a smaller state through rows of shredding teeth until they can fall through the sieve holes. The fallen materials enter the grinding unit for grinding and processing, which can effectively avoid the problem of straw material being too large in size and causing grinding material discharge blockage, thereby ensuring the stable operation of the entire device.

[0009] As a further configuration of the above scheme, the grinding unit includes a shredding cylinder and a collecting hopper connected upper and lower, a grinding ring block with an inverted conical grinding surface in the middle is fixed in the shredding cylinder, a grinding cone block is rotatably arranged in the grinding ring block, and a grinding motor is connected to the upper end of the grinding cone block.

[0010] As a further configuration of the above scheme, the grinding motor is connected to the grinding vertical shaft on the grinding cone block through a spline shaft and a spline sleeve, the lower end of the grinding vertical shaft is connected to a centrifugal turntable located below the grinding ring block, the centrifugal turntable is rotatably connected to a roller through a connecting strip, and a guide groove that acts on the roller is formed at the lower end of the grinding ring block by connecting an arc segment and a raised segment end to end.

[0011] As a further configuration of the above scheme, a ring groove is provided on the lower surface of the grinding ring block, the guide groove is provided on the inner wall of the ring groove, the connecting strip extends vertically into the ring groove and the roller acts on the guide groove.

[0012] The grinding unit in the present invention is specially improved and designed. When the grinding motor drives the grinding cone block to rotate, due to the action of the roller and the guide groove, when the roller moves to the raised section in the guide groove, it can move upward. At this time, under the action of the connecting bar, the centrifugal turntable and the grinding vertical shaft, the grinding cone block can move upward a short distance, thereby increasing the grinding gap between the grinding ring block and the grinding cone block, facilitating the smooth entry of the shredded straw material. After entering, the grinding gap will immediately become smaller again, so that the material can be ground and processed, further avoiding the problem of material blockage before grinding, and ensuring the stability of the straw crushing material grinding process.

[0013] As a further configuration of the above solution, the outer end portion of the hollow shaft is rotatably connected to a sealing sleeve, and a steam delivery pipe is connected between the sealing sleeve and the steam generator.

[0014] As a further configuration of the above scheme, the side section where the sealing bucket is connected to the shredding cylinder is in the shape of an Archimedean spiral with a gradually decreasing radius, and the sieve holes are provided on the lower end and lower half of the shredding cylinder away from the sealing bucket.

[0015] As a further configuration of the above scheme, the feeding mechanism includes a receiving hopper, a convex cylinder extending outward from the lower end of one side of the receiving hopper, a conveying auger extending to the bottom of the receiving hopper is rotatably arranged in the convex cylinder, and a driving motor connected to the conveying auger is arranged on the outer side of the receiving hopper.

[0016] As a further configuration of the above scheme, a driving wheel is arranged on the motor shaft of the driving motor, a driven wheel is arranged at the outer end of the roller shaft of the shredding roller, and a transmission belt is arranged between the driven wheel and the driving wheel. Beneficial Effects

[0017] The present invention adopts a specially designed processing device to sequentially steam soften, shred and grind straw materials in agricultural and forestry wastes, so that the prepared fiber powder can be used for the production of medium-density fiberboard, thus realizing the resource recycling of agricultural and forestry wastes.

[0018] The processing device in the present invention adopts a double-layer steam processing unit to process straw fragments. The straw fragments are fully contacted with high-temperature steam during the upward transportation of the inner layer, so that the straw fragments can be processed to be fully softened. Then, the remaining high-temperature steam enters the steam jacket of the outer layer through the connecting hole to heat and insulate the entire feed barrel. On the one hand, the steam softening treatment effect of the inner layer on the straw fragments is improved, and on the other hand, the energy consumption of the entire steam processing unit is reduced, thereby reducing the processing cost.

[0019] The present invention also provides a shredding unit between the grinding unit and the steam treatment unit, and utilizes the shredding unit to further tear the straw fragments before grinding into a smaller state. In combination with the specially designed grinding unit, the straw fragments can be smoothly discharged during the grinding process, thereby achieving effective grinding of the straw fragments and improving the operating stability of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the processing device in the present invention from a first angle; Figure 2 It is a schematic diagram of the three-dimensional structure of the processing device in the present invention from a second angle; Figure 3 It is a schematic diagram of the internal three-dimensional structure of the steam treatment unit in the processing device of the present invention; Figure 4 It is a schematic diagram of the external three-dimensional structure of the shredding unit in the processing device of the present invention; Figure 5 It is a schematic diagram of the internal three-dimensional structure of the shredding unit in the processing device of the present invention; Figure 6 It is a schematic diagram of the internal planar structure of the shredding unit in the processing device of the present invention; Figure 7 It is a schematic diagram of the internal three-dimensional structure of the grinding unit in the processing device of the present invention; Figure 8It is a schematic diagram of the three-dimensional structure of the grinding ring block, centrifugal turntable, roller, etc. in the processing device of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments. Example 1

[0024] Example 1 discloses a processing device for processing agricultural and forestry waste into medium density fiberboard fibers, the main part of which is shown in the attached Figure 1 and attached Figure 2 , comprising a steam processing unit 1, a shredding unit 2, a grinding unit 3, a steam generator 4 and a frame 5. The steam generator 4 is arranged on one side of the frame 5, the steam processing unit 1, the shredding unit 2 and the grinding unit 3 are all arranged on the upper end of the frame 5, and the three are connected in sequence, and the steam generator 4 is connected to the steam processing unit 1.

[0025] Reference Figure 3The steam treatment unit 1 includes an inclined delivery barrel 101 and a feeding hopper 102. The feeding hopper 102 is connected to the upper surface of the lower end of the delivery barrel 101, and a feeding pipe 103 is provided on the lower surface of the upper end of the delivery barrel 101. A steam jacket 104 is provided on the outer surface of the delivery barrel 101, and a connecting hole 105 connected to the steam jacket 104 is opened on the upper surface of the upper end of the delivery barrel 101, and then a drain pipe 106 is connected to the lower surface of the lower end of the steam jacket 104. Sealed bearings 107 are provided on both end surfaces of the delivery barrel 101, and a hollow shaft 108 is rotatably provided in the two sealed bearings 107, and a spiral blade 109 matching the delivery barrel 101 is provided on the hollow shaft 108. The upper end of the hollow shaft 108 is connected to a conveying motor 110 fixed on the upper end surface of the conveying barrel 101, and the lower end thereof is rotatably connected to a sealing sleeve 111, and the sealing sleeve 111 is connected to the steam generator 4 through the steam conveying pipe 6. Finally, a plurality of steam discharge holes 112 are opened on the outer circumferential surface of the hollow shaft 108, and the steam discharge holes 112 are arranged on the lower half of the hollow shaft 108 at the connection between the conveying barrel 101 and the feeding hopper 102. During the operation of the steam treatment unit 1, the straw material in the hopper 102 is transported upward from the bottom of the feed barrel 101 under the action of the spiral blades 109, and at the same time, the high-temperature steam generated by the steam generator 4 enters the feed barrel 101 through the steam discharge hole 112, and interacts with the straw material in the transportation process, and steam-treats it to soften it; when the straw material is transported to the top of the feed barrel 101, it enters the shredding unit 2 through the discharge pipe 103, and the high-temperature steam enters the steam jacket 104 through the connecting hole 105, and then flows downward along the steam jacket 104, and heats and insulates the feed barrel 101 during the flow process, thereby improving the steam softening treatment effect of the material, and finally the liquefied water and a small amount of steam are discharged from the drain pipe 106.

[0026] Reference Figure 4 , Attachment Figure 5 and attached Figure 6 The shredding unit 2 includes a horizontally placed columnar shredding cylinder 201, and a sealing bucket 202 connected to the feeding pipe 103 is arranged above one side end of the shredding cylinder 201, and the side section where the sealing bucket 202 and the shredding cylinder 201 are connected is in the shape of an Archimedean spiral with a gradually decreasing radius. A large number of sieve holes 203 are provided on the outer circumferential surface of the lower end of the sealing bucket 202 and the outer circumferential surface of the lower half of the shredding cylinder 201 away from the sealing bucket 202. The sieve holes 203 are in the shape of long strips, with a width of 2 to 3 mm and a length of 8 to 12 mm.

[0027] A shredding roller 204 is coaxially arranged inside the shredding cylinder 201, and a plurality of rows of shredding teeth 205 are arranged in an annular array on the outer circumferential surface of the shredding roller 204. A driven wheel 206 is arranged at the end of the roller shaft of the shredding roller 204 extending out of the shredding cylinder 201. In addition, a plurality of arc-shaped cutting knives 207 are arranged on the upper half of the shredding cylinder 201 away from the sealing bucket 202, and the plurality of arc-shaped cutting knives 207 are arranged at equal intervals along the axial direction. A receiving hopper 208 is arranged below the shredding cylinder 201, and a convex cylinder 209 extends outward from the lower end of one side of the receiving hopper 208, and a conveying auger 210 extending to the bottom of the receiving hopper 208 is rotatably arranged in the convex cylinder 209. A driving motor 211 is arranged on the outer side of the receiving hopper 208 , and the motor shaft end of the driving motor 211 is connected to the conveying auger 210 . A driving wheel 212 is also arranged on the motor shaft of the driving motor 211 , and a transmission belt 213 is arranged between the driving wheel 212 and the driven wheel 206 .

[0028] During the operation of the shredding unit 2, the steam-softened straw material enters the sealing bucket 202, and then accumulates between the lower end of the sealing bucket 202 and the shredding roller 204. During the rotation of the shredding roller 204, the straw material is gradually torn off by rows of shredding teeth 205 and moves toward the arc-shaped cutting knife 207. Under the action of the arc-shaped cutting knife 207, the torn long straw material is cut off, and the cut material falls into the receiving hopper 208 through the sieve hole 203, while the unscreened material is shredded and cut off for many times in the shredding cylinder 201 until it can fall through the sieve hole 203. The material falling into the receiving hopper 208 is finally transported by the conveying auger 210, and finally discharged from the lower end of the convex cylinder 209 into the grinding unit 3.

[0029] Reference Figure 7 and attached Figure 8The grinding unit 3 includes a vertical grinding cylinder 301, the lower end of which is connected to a collecting hopper 302, and a fiber material discharge pipe is provided at the lower end of the collecting hopper 302. A grinding ring block 303 is fixed to the upper end of the inner wall of the grinding cylinder 301, and an inverted conical grinding surface is provided at the center of the grinding ring block 303, and a ring baffle 304 protrudes upward at a certain distance from the upper end of the grinding surface. An inverted conical grinding cone block 305 is provided in the grinding ring block 303, and a certain grinding annular gap is reserved between the grinding cone block 305 and the grinding surface. A grinding vertical shaft 306 is concentrically provided on the grinding cone block 305, and then a grinding motor 307 is installed on the top of the grinding cylinder 301, and the grinding motor 307 is connected to the top of the grinding vertical shaft 306 through the spline shaft and spline sleeve at the lower end. The lower end of the grinding vertical shaft 306 extending out of the grinding ring block 303 is connected to a centrifugal turntable 308, and the outer circular end of the centrifugal turntable 308 is connected to a vertically upward connecting strip 309, and then a roller 310 is rotatably arranged on the upper end of the connecting strip 309. In addition, an annular groove 311 is provided on the lower surface of the grinding ring block 303, and a guide groove 312 that interacts with the roller 310 is provided on the inner wall of the annular groove 311, and the guide groove 312 is composed of an arc segment and a convex segment connected end to end.

[0030] During the operation of the grinding unit 3, the shredded short straw fiber materials fall onto the upper surface of the grinding cone block 305, and then are evenly thrown out to the surroundings under the action of centrifugal force, and fall into the upper end of the grinding annular gap after being blocked by the annular baffle 304, and then are ground under the action of the grinding cone block 305 and the grinding ring block 303, so that the short straw fiber materials are finally ground into powdery fiber materials. In addition, every time the grinding cone block 305 rotates one circle, the roller 310 will interact with the raised section on the guide groove 312, thereby lifting the grinding cone block 305 upward for a short distance, increasing the grinding annular gap, facilitating the downward movement of the short straw fiber materials at the upper end of the grinding annular gap, and avoiding the problem of blockage of the grinding material discharge. Example 2

[0031] Example 2 discloses a method for processing agricultural and forestry waste into fibers for medium density fiberboard using the processing device in Example 1, comprising the following steps: S1: Use a cutting machine to cut bundles of corn, sorghum and other straw into 3-6 cm pieces for later use.

[0032] S2: The straw fragments are added into the feeding hopper 102 through the elevator, and then the spiral blades 109 transport them uniformly from bottom to top along the inside of the feeding barrel 101. During the transportation process, the high-temperature steam generated by the steam generator 4 enters the feeding barrel 101 through the steam discharge holes 112, thereby contacting the straw fragments during the transportation process, so that the high-temperature steam causes the straw fragments to soften.

[0033] S3: The steam-softened straw fragments are put into the sealing bucket 202 and accumulated downward along the outer side surface of the sealing bucket 202 between the lower end of the sealing bucket 202 and the shredding roller 204. Then, during the rotation of the shredding roller 204, the straw fragments are further shredded by the shredding teeth 205. After being shredded, they interact with the arc-shaped cutting knife 207 to be processed into thinner and shorter strips of straw fragments.

[0034] S4: The shredded straw material is put into the grinding cylinder 301, and is thrown into the grinding annular gap between the grinding cone block 305 and the grinding surface under the action of centrifugal force. Then, it is processed into fiber powder material under the grinding action of the grinding cone block 305 and the grinding ring block 303, and finally discharged from the bottom of the collecting hopper 302. The discharged fiber powder material is mixed with glue, dried, paved, and hot-pressed to obtain medium-density fiberboard.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing medium density fiberboard fibers from agricultural and forestry wastes, characterized in that: The steps include: S1: Cut the agricultural and forestry straw into pieces for later use; S2: feeding the straw chips into a steam generator (1) for high temperature softening treatment; S3: sending the steam-softened straw shreds into a shredding unit (2) for shredding and screening to obtain straw shreds; S4: sending the shredded straw material into a grinding unit (3) for grinding to obtain fiber material for medium density fiberboard; The steam treatment unit (1) comprises a feeding cylinder (101) and a feeding hopper (102), wherein the feeding hopper (102) is connected to the inclined lower end of the feeding cylinder (101), and the inclined upper end of the feeding cylinder (101) is connected to the shredding unit (2). A steam jacket (104) is arranged on the outside of the feeding cylinder (101), and a connecting hole (105) connected to the steam jacket (104) is opened at the upper end of the feeding cylinder (101). The steam jacket (104) is provided with a steam jacket (104). The lower end of the conveying barrel (104) is connected to a drain pipe (106), a hollow shaft (108) is rotatably arranged in the conveying barrel (101), and a spiral blade (109) is arranged on the outer circumferential surface of the hollow shaft (108), and the two ends of the hollow shaft (108) extending out of the conveying barrel (101) are respectively connected to a conveying motor (110) and a steam generator (4), and a steam discharge hole (112) is opened on the hollow shaft (108) located in the lower half of the conveying barrel (101); The shredding unit (2) comprises a shredding cylinder (201), a sealing bucket (202) connected to the feeding cylinder (101) is arranged at the side end of the shredding cylinder (201), a sieve hole (203) is opened on the outer circumferential surface of the shredding cylinder (201), and a plurality of arc-shaped cutting knives (207) are arranged at equal intervals along the axial direction on the inner wall of the shredding cylinder (201) above the sieve hole (203), a shredding roller (204) is rotatably arranged inside the shredding cylinder (201), and a plurality of rows of shredding teeth (205) are evenly arranged on the roller body of the shredding roller (204) in the circumferential direction, and a feeding mechanism connected to the grinding unit (3) is arranged at the lower end of the shredding cylinder (201).

2. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 1, characterized in that: The grinding unit (3) comprises a shredding cylinder (301) and a collecting hopper (302) connected up and down, a grinding ring block (303) with an inverted conical grinding surface in the middle fixed in the shredding cylinder (301), a grinding cone block (305) rotatably arranged in the grinding ring block (303), and a grinding motor (307) connected to the upper end of the grinding cone block (305).

3. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 2, characterized in that: The grinding motor (307) is connected to a grinding vertical shaft (306) on a grinding cone block (305) via a spline shaft and a spline sleeve; the lower end of the grinding vertical shaft (306) is connected to a centrifugal turntable (308) located below the grinding ring block (303); a roller (310) is rotatably connected to the centrifugal turntable (308) via a connecting strip (309); a guide groove (312) interacting with the roller (310) is formed at the lower end of the grinding ring block (303); the guide groove (312) is composed of an arc segment and a convex segment connected end to end.

4. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 3, characterized in that: The lower surface of the grinding ring block (303) is provided with an annular groove (311), the guide groove (312) is provided on the inner wall of the annular groove (311), the connecting strip (309) vertically extends into the annular groove (311), and the roller (310) interacts with the guide groove (312).

5. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 1, characterized in that: The outer end of the hollow shaft (108) is rotatably connected to a sealing sleeve (111), and a steam delivery pipe (6) is connected between the sealing sleeve (111) and the steam generator (4).

6. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 1, characterized in that: The side cross-section where the sealing bucket (202) is connected to the shredding cylinder (201) is in the shape of an Archimedean spiral with a gradually decreasing radius, and the sieve holes (203) are provided on the lower end and lower half of the shredding cylinder (201) on the side away from the sealing bucket (202).

7. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 1, characterized in that: The feeding mechanism comprises a receiving hopper (208), a convex cylinder (209) extending outwardly from a lower end of one side of the receiving hopper (208), a conveying auger (210) rotatably arranged in the convex cylinder (209) and extending to the bottom of the receiving hopper (208), and a driving motor (211) connected to the conveying auger (210) is arranged on the outer side surface of the receiving hopper (208).

8. The method for producing medium density fiberboard fibers from agricultural and forestry wastes according to claim 7, characterized in that: A driving wheel (212) is arranged on the motor shaft of the driving motor (211), a driven wheel (206) is arranged at the outer end of the roller shaft of the shredding roller (204), and a transmission belt (213) is arranged between the driven wheel (206) and the driving wheel (212).

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