Biomass fuel raw material crushing and screening device and operation method

Abstract

The invention relates to the technical field of biomass fuel processing, and discloses a biomass fuel raw material crushing and screening device and an operation method, the biomass fuel raw material crushing and screening device comprises a crushing box, a crushing roller, a screening drum and a guide roller; the two crushing rollers are longitudinally and rotatably installed on the two sides of the interior of the crushing box through rotating shafts, staggered crushing blocks are arranged on the outer surfaces of the two crushing rollers, and a driving motor is installed on the portion, at the front ends of the crushing rollers, of the outer surface of the crushing box and is in transmission connection with the crushing rollers through the rotating shafts. Screen holes with the same size are evenly formed in the surface of the screen drum. The screen drum capable of being driven to rotate is arranged on the outer rings of the two crushing rollers, raw materials fall into the screen drum after being crushed so as to be screened by the rotating screen drum, and when the screen drum rotates, large raw materials can be brought to the position between the upper crushing rollers to be crushed again through the poking rod with the inclined inner wall, so that the large raw materials are crushed again, and the crushing efficiency is improved. And large raw materials are prevented from accumulating on the bottom surface of the screen drum to affect the screening effect.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass fuel processing, and in particular to a biomass fuel raw material crushing and screening device and an operation method thereof. Background Technique

[0002] Biomass fuel refers to using biomass materials for combustion as fuel, generally mainly agricultural and forestry waste (such as straw, sawdust, bagasse, rice bran, etc.). It is mainly different from fossil fuels. In national policies and environmental protection standards, directly burning biomass belongs to a highly polluting fuel and is only used in large stoves in rural areas and is not allowed to be used in cities. The application of biomass fuel is actually mainly biomass briquette fuel, which uses agricultural and forestry waste as raw materials and is made into various shapes (such as blocks, granules, etc.) through processes such as crushing, mixing, extrusion, and drying, and is a new type of clean fuel that can be directly burned.

[0003] Biomass fuel is made into briquette fuel through processes such as crushing, mixing, extrusion, and drying. Through the above operations, the particle size of the raw materials can be made uniform, which is conducive to full combustion and improves the thermal efficiency; mixing can blend different raw materials and optimize the fuel composition; extrusion increases the fuel density, makes its structure more compact, burns more stably, and reduces coking and fly ash; drying reduces the moisture content, avoids excessive smoke generation during combustion, and at the same time is convenient for storage and transportation, reduces logistics costs, and reduces storage space.

[0004] In order to make the particle size of the crushed raw materials uniform, it is necessary to screen the crushed raw materials. However, in the traditional method, screening is carried out through a sieve mesh. The large raw materials left after filtration are easily piled up on the surface of the sieve mesh and need to be returned for further crushing. Moreover, these raw materials will also affect the passing of qualified raw material particles and affect the screening effect. Therefore, we propose a biomass fuel raw material crushing and screening device and an operation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a biomass fuel raw material crushing and screening device and an operation method thereof. By arranging a sieve cylinder that can be driven to rotate on the outer ring of two crushing rollers, the raw materials are crushed and then fall into the interior of the sieve cylinder and are screened by the rotating sieve cylinder. When the sieve cylinder rotates, the large raw materials can be driven to the upper part between the crushing rollers again by the inclined stirring rods on the inner wall for crushing, so that the large raw materials are crushed again, and the accumulation of large raw materials on the bottom surface of the sieve cylinder affecting the screening effect is avoided, thus solving the problems raised in the background technique.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a biomass fuel raw material crushing and screening device and an operating method, comprising a crushing box, a crushing roller, a screen drum and a guide roller; the crushing roller is provided with two and is longitudinally rotatably installed on both sides of the crushing box through a rotating shaft, the outer surfaces of the two crushing rollers are provided with mutually staggered crushing blocks, the outer surface of the crushing box at the front end of the crushing roller is installed with a driving motor, and the driving motor is connected to the crushing roller through the rotating shaft;

[0007] The surface of the screen drum is evenly provided with screen holes of the same size, the screen drum is rotatably placed on the outer rings of the two crushing rollers, guide rollers are longitudinally rotatably installed inside the crushing boxes on both sides below the screen drum, the guide rollers are supported on the bottom surface of the screen drum, a stepper motor is installed on the outer surface of the crushing box at the front end of the guide roller, the stepper motor is connected to the guide roller, and upper rollers are longitudinally rotatably installed inside the crushing boxes on both sides above the screen drum, and the upper rollers are in contact with the outer surface of the screen drum;

[0008] A lever is also fixed obliquely on one side of the lower part of the screen drum, and the end of the lever is inclined toward the lower position between the crushing rollers. A plurality of levers are evenly fixed in the longitudinal direction. An opening communicating with the outside is opened on the top surface of the screen drum. The front end and the rear end of the screen drum are through structures. Inclined guide plates are longitudinally fixed inside the crushing box below the two sides of the opening. The guide plates are located above the two crushing rollers and inclined toward the position between the crushing rollers.

[0009] A feed port is provided on the surface of the crushing box above the opening, a feed hopper connected to the feed port is provided on the surface of the crushing box above the feed port, the feed port is aligned with the opening, a discharge port is provided at the bottom of the crushing box, and inclined slopes are provided inside the crushing box on both sides of the discharge port.

[0010] By adopting the above technical scheme, the raw materials enter the crushing box and enter between the two crushing rollers inside the screen drum, are crushed by the crushing rollers and fall to the bottom of the screen drum, are screened by the rotating screen drum, and large pieces of raw materials are moved to the top and pass between the two crushing rollers again to be crushed again, which has higher crushing and screening efficiency and avoids the accumulation of large pieces of raw materials inside the screen drum to affect the screening effect.

[0011] As a preferred embodiment of the present invention, a baffle is longitudinally arranged inside the sieve drum below the opening, the baffle is fixed inside the sieve drum through connecting rods at the four corners of the front and rear ends, and the middle position of the baffle is bent toward the opening.

[0012] By adopting the above technical solution, the opening is rotated downward, and the baffle has the function of preventing the raw materials from falling directly from the opening. When the opening is at the top, it has a certain inhibitory effect on the dust spreading outward.

[0013] As a preferred embodiment of the present invention, side rods are fixedly inclined inside the sieve cylinder on both sides of the opening. A plurality of side rods are evenly distributed in the longitudinal direction, and the side rods on both sides of the opening are symmetrical to each other.

[0014] By adopting the above technical solution, when the opening rotates to the lower side, the side rods can prevent the raw materials from being discharged from the opening. When the opening is placed on the upper side, the side rods can prevent the added raw materials from falling outside the guide plate. In addition, the other side rods can also play a role in lifting large pieces of raw materials.

[0015] As a preferred embodiment of the present invention, an observation port is provided on the front surface of the crushing box, and glass is fixedly embedded in the observation port.

[0016] By adopting the above technical solution, the internal situation of the crushing box can be observed through the observation port.

[0017] As a preferred embodiment of the present invention, a rubber pad is fixedly wound around the outer ring of the guide roller, and the guide roller is supported on the outer surface of the sieve cylinder through the rubber pad.

[0018] By adopting the above technical solution, the guide roller can drive the sieve cylinder to rotate in an anti-slip manner.

[0019] As a preferred embodiment of the present invention, the distance between the side rods is equal to the distance between the stirring rods, and the distance between the side rods and the distance between the stirring rods are equal to the inner diameter of the sieve holes.

[0020] By adopting the above technical solution, the stirring rods and the side rods only stir and block large pieces of raw materials that are larger than the sieve holes and cannot pass through.

[0021] As a preferred embodiment of the present invention, a guide cover is fixedly installed inside the crushing box on the outer ring below the feed inlet, and the guide cover is aligned with the opening.

[0022] By adopting the above technical solution, the added raw materials can enter the inner side of the sieve cylinder from the opening under the guiding action of the guide cover.

[0023] As a preferred embodiment of the present invention, four supporting feet are fixedly supported at the four corners of the bottom of the crushing box.

[0024] By adopting the above technical solution, the crushing box can be supported by the supporting feet at the four corners.

[0025] As a preferred embodiment of the present invention, it includes the following steps:

[0026] Step 1: Connect both the driving motor and the stepping motor to the industrial control device and power on the industrial control device. Start the stepping motor to drive the left and right crushing rollers to rotate clockwise and counterclockwise respectively;

[0027] Step 2: Feed the biomass fuel raw materials to be crushed into the hopper. After passing through the feed port and under the guiding action of the guide cover, they fall downward from the opening, and then move to both sides on the surface of the baffle. The side rods prevent the raw materials from falling outside the guide plate to the outside, and guide the raw materials into the space between the two crushing rollers under the guiding action of the guide plate. The rotating crushing rollers cooperate with the crushing blocks distributed on their surfaces to crush the raw materials of the biomass fuel and make them fall downward;

[0028] Step 3: Stop adding raw materials, start the stepping motor to drive the guide rollers on both sides to rotate clockwise, thereby driving the sieve cylinder to rotate counterclockwise. When rotating, the crushed raw materials can be screened through the sieve holes on the surface of the sieve cylinder. The raw materials that meet the size requirements fall and are discharged from the discharge port, while the raw materials with larger sizes remain in the sieve cylinder;

[0029] Step 4: When the obliquely arranged dial rod rotates counterclockwise to the bottom, it will drive the large pieces of raw materials to rotate counterclockwise together. Finally, it rotates to the upper position, making the dial rod in the upper right and inclined from the upper right to the lower left. The large pieces of raw materials lifted by the dial slide obliquely and pass through the guide plate and pass between the two crushing rollers again to be crushed again;

[0030] Step 5: The baffle is located below the crushing roller and above the opening, preventing the crushed raw materials from directly falling out from the opening downward without being screened. The side rods on both sides of the opening can also prevent large pieces of raw materials from sliding to the opening position and being discharged. Until the sieve cylinder continues to rotate counterclockwise to the initial position where the opening aligns with the guide cover, raw materials can be added to the inside of the crushing box to continue the crushing work.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. The biomass fuel raw material crushing and screening device and operation method of the present invention are provided with a sieve cylinder that can be driven to rotate on the outer ring of the two crushing rollers. After the raw materials are crushed, they fall inside the sieve cylinder and are screened by the rotating sieve cylinder. When the sieve cylinder rotates, the large pieces of raw materials can be brought to the upper part between the crushing rollers again by the dial rod with an inclined inner wall to be crushed, so that the large pieces of raw materials are crushed again, and the accumulation of large pieces of raw materials on the bottom surface of the sieve cylinder is avoided, which affects the screening effect.

[0033] 2. The biomass fuel raw material crushing and screening device and operation method of the present invention are longitudinally fixed with a baffle inside the sieve cylinder below the opening. When the opening rotates to the lower position, the baffle can block and prevent the crushed raw materials from directly falling to the opening position and being discharged. In addition, the baffle also has the function of reducing the outward diffusion of dust during crushing.

[0034] 3. The biomass fuel raw material crushing and screening device and operation method of the present invention are such that side rods uniformly distributed in the longitudinal direction are inclined and fixed on both sides of the opening. When the opening rotates to the lower side, the side rods prevent the raw materials from sliding to the opening position. When the opening is placed on the upper side, the side rods can prevent the raw materials from falling to the outside of the guide plate on both sides.

[0035] 4. The biomass fuel raw material crushing and screening device and operation method of the present invention are such that an observation port is further provided on the outer surface of the crushing box, and the internal situation of the crushing box can be observed through the glass of the through port. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings, other features, objects, and advantages of the present invention will become more apparent:

[0037] Figure 1 is a schematic diagram of the overall structure of the biomass fuel raw material crushing and screening device of the present invention;

[0038] Figure 2 is a schematic diagram of the internal structure of the biomass fuel raw material crushing and screening device of the present invention;

[0039] Figure 3 is a schematic diagram of the inner surface structure of the screen cylinder at the dial rod of the biomass fuel raw material crushing and screening device of the present invention;

[0040] Figure 4 is a schematic diagram of the cross-sectional structure of the guide roller of the biomass fuel raw material crushing and screening device of the present invention;

[0041] Figure 5 is a schematic diagram of the structure when the opening of the biomass fuel raw material crushing and screening device of the present invention rotates to the lower side.

[0042] In the figure: 1, crushing box; 11, support feet; 12, discharge port; 121, slope; 13, observation port; 131, glass; 2, crushing roller; 21, rotating shaft; 22, crushing block; 23, driving motor; 3, screen cylinder; 31, opening; 32, dial rod; 33, baffle; 331, connecting rod; 34, side rod; 35, screen hole; 4, guide roller; 41, stepping motor; 42, rubber pad; 5, upper roller; 6, guide plate; 7, feed port; 71, feed hopper; 72, guide cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Please refer to Figures 1-5 , the present invention provides a technical solution: a biomass fuel raw material crushing and screening device, including a crushing box 1 and a crushing roller 2; support feet 11 are supported and fixed at the four corners of the bottom of the crushing box 1, there are four support feet 11, and the support feet 11 have the same height to achieve the purpose of stably supporting the crushing box 1.

[0044] The same as the prior art is that two crushing rollers 2 are provided and are longitudinally rotatably installed on both sides of the crushing box 1 through a rotating shaft 21, the crushing rollers 2 on both sides are close to each other, and the outer surfaces of the two crushing rollers 2 are provided with mutually staggered crushing blocks 22, and a driving motor 23 is installed on the outer surface of the crushing box 1 at the front end of the crushing roller 2, and the driving motor 23 is connected to the crushing roller 2 through the rotating shaft 21. When in use, the driving motor 23 is started to drive the crushing roller 2 on the left to rotate clockwise, while the crushing roller 2 on the right rotates counterclockwise, so that the biomass fuel passing through the two crushing rollers 2 can be crushed.

[0045] A feed port 7 connected to the inside of the crushing box 1 is provided on the upper surface of the crushing box 1, and a feed hopper 71 connected to the feed port 7 is provided on the surface of the crushing box 1 above the feed port 7. When in use, raw materials can be put into the feed hopper 71 and enter the inside of the crushing box 1 through the feed port 7. The feed port 7 is placed just above the two crushing rollers 2, so that the raw materials can be crushed between the crushing rollers 2 on both sides. A discharge port 12 is provided at the bottom of the crushing box 1, and inclined slopes 121 are provided inside the crushing box 1 on both sides of the discharge port 12. The crushed raw materials can be guided by the slope 121 and finally discharged out of the discharge port 12.

[0046] In order to achieve efficient screening of raw materials and avoid the large pieces of raw materials affecting the screening effect, the present invention makes the following improvements:

[0047] A screen drum 3 and a guide roller 4 are also provided. The surface of the screen drum 3 is evenly provided with screen holes 35 of the same size, and the screen drum 3 is rotatably placed on the outer rings of the two crushing rollers 2. An opening 31 connected to the outside is provided on the top surface of the screen drum 3. The opening 31 is aligned with the feed port 7, and a guide cover 72 is fixed inside the crushing box 1 of the outer ring below the feed port 7. The guide cover 72 is aligned with the opening 31. After the raw material enters from the feed hopper 71 and the feed port 7, it smoothly enters the inner side of the screen drum 3 from the opening 31 under the guidance of the guide cover 72, and can fall between the crushing rollers 2 on both sides to be crushed.

[0048] In addition, the front and rear ends of the screen drum 3 are through structures, so that inclined guide plates 6 are longitudinally fixed inside the crushing box 1 below both sides of the opening 31. The guide plates 6 are located above the two crushing rollers 2 and inclined toward the position between the crushing rollers 2. The raw materials can pass between the crushing rollers 2 on both sides under the guidance of the guide plates 6.

[0049] On both sides below the sieve cylinder 3, guide rollers 4 are longitudinally and rotatably installed inside the crushing boxes 1. The guide rollers 4 support on the bottom surface of the sieve cylinder 3. And on the outer surface of the crushing box 1 at the front end of the guide roller 4, a stepping motor 41 is installed. The stepping motor 41 is in transmission connection with the guide roller 4. Above both sides of the sieve cylinder 3, upper rollers 5 are also longitudinally and rotatably installed inside the crushing boxes 1. The upper rollers 5 abut against the outer surface of the sieve cylinder 3. At the same time, a rubber pad 42 is fixedly wound around the outer ring of the guide roller 4. The guide roller 4 is supported on the outer surface of the sieve cylinder 3 through the rubber pad 42. The stepping motor 41 drives the guide roller 4 to rotate clockwise, and then the sieve cylinder 3 can be driven to rotate counterclockwise through the anti-slip of the rubber pad 42. The crushed raw materials will also fall inside the sieve cylinder 3. When the sieve cylinder 3 is driven to rotate counterclockwise, the raw materials can be screened, and the raw materials that meet the size requirements will fall and finally be discharged to the outside from the discharge port 12.

[0050] Through the above settings, during the use process, large pieces of raw materials will still remain in the sieve cylinder 3. To solve this problem, a dial rod 32 is fixedly installed obliquely on the lower left side inside the sieve cylinder 3. The end of the dial rod 32 is obliquely oriented towards the lower position between the crushing rollers 2. A plurality of dial rods 32 are fixedly arranged at equal intervals in the longitudinal direction, and the distance between the dial rods 32 is equal to the inner diameter of the sieve holes 35. Therefore, when rotating counterclockwise, the dial rod 32 can lift large pieces of raw materials with sizes larger than the sieve holes 35 to the upper right side until the end of the dial rod 32 is inclined towards the lower left side, and then the large pieces of raw materials will fall. Under the guiding action of the guiding plate 6, they will pass between the two crushing rollers 2 again and be crushed, avoiding the accumulation of raw materials and ensuring sufficient crushing.

[0051] When the opening 31 rotates to the lowermost position, the crushed raw materials are likely to fall to the outside through the opening 31 without being filtered. To avoid this situation, a baffle 33 is longitudinally arranged inside the sieve cylinder 3 below the opening 31. The baffle 33 is fixed inside the sieve cylinder 3 through connecting rods 331 at the four corners of its front and rear ends. The middle position of the baffle 33 bends towards the opening 31. When the opening 31 rotates to the lower position ( Figure 5 ), the baffle 33 is above the opening 31, which can prevent the crushed raw materials from falling to the outside through the opening 31 without being screened. Additionally, when the opening 31 rotates to the upper position, the baffle 33 is below the opening 31, which has a certain inhibitory effect on the outward diffusion of dust.

[0052] The un-screened raw materials will also slide to the opening 31 from the side. To avoid this problem, side rods 34 are fixedly installed inside the sieve cylinder 3 on both sides of the opening 31 in an inclined manner. A plurality of side rods 34 are evenly distributed in the longitudinal direction, and the side rods 34 on both sides of the opening 31 are symmetrical to each other. The spacing between the side rods 34 is equal to the spacing between the stirring rods 32, that is, the spacing between the side rods 34 is equal to the inner diameter of the sieve holes 35. Therefore, the side rods 34 can prevent large raw materials from sliding to the position of the opening 31 through the side rods 34, while small raw materials can pass through smoothly. The side rods 34 can be used for screening. At the same time, when the opening 31 is placed above, the side rods 34 can also prevent the added raw materials from falling outside the guide plate 6. Finally, the side rods 34 can also play a role in lifting large raw materials, similar to the function of the stirring rods 32.

[0053] An observation port 13 is provided on the front surface of the crushing box 1, and a glass 131 is fixedly embedded in the observation port 13. The inside of the crushing box 1 can be observed at all times through the observation port 13.

[0054] When the biomass fuel raw material crushing and screening device is in use, it is necessary to connect the driving motor 23 and the stepping motor 41 to the industrial control equipment and power on the industrial control equipment. Start the stepping motor 41 to drive the left and right crushing rollers 2 to rotate clockwise and counterclockwise respectively. Then, the biomass fuel raw materials to be crushed are fed into the feeding hopper 71, and after passing through the feeding port 7, under the guiding action of the guiding cover 72, they fall downward from the opening 31. Then, they move to both sides on the surface of the baffle 33. The side rods 34 block to prevent the raw materials from falling outside the guide plate 6 to the outside, and the raw materials enter between the two crushing rollers 2 under the guiding action of the guide plate 6. The rotating crushing rollers 2 cooperate with the crushing blocks 22 distributed on their surfaces to crush the raw materials of the biomass fuel and fall downward. When the addition of raw materials stops, start the stepping motor 41 to drive the guide rollers 4 on both sides to rotate clockwise, thereby driving the sieve cylinder 3 to rotate counterclockwise. During the rotation, the crushed raw materials can be screened through the sieve holes 35 on the surface of the sieve cylinder 3. The raw materials that meet the size requirements fall and are discharged from the discharge port 12, while the raw materials with larger sizes remain in the sieve cylinder 3. When the inclined stirring rod 32 rotates counterclockwise to the bottom, it will drive the large raw materials to rotate counterclockwise together, and finally rotate to the upper position, so that the stirring rod 32 is in a state of being inclined to the left and downward on the upper right side ( Figure 5 ), which can make the large raw materials lifted by the stirring slide down obliquely and pass through the guide plate 6 and pass between the two crushing rollers 2 again to be crushed again. At this time, the original baffle 33 located above will be located below the crushing rollers 2 and above the opening 31, preventing the crushed raw materials from directly falling downward from the opening 31 without being screened. The side rods 34 on both sides of the opening 31 can also prevent large raw materials from sliding to the position of the opening 31 and being discharged. Until the sieve cylinder 3 continues to rotate counterclockwise to the initial position where the opening 31 is aligned with the guiding cover 72, raw materials can be added to the inside of the crushing box 1 to continue the crushing work.

Claims

1. A biomass fuel raw material crushing and screening device, characterized in that The invention comprises a crushing box (1), a crushing roller (2), a screen drum (3) and a guide roller (4); the crushing roller (2) is provided with two and is longitudinally rotatably mounted on both sides of the crushing box (1) via a rotating shaft (21); the outer surfaces of the two crushing rollers (2) are provided with mutually staggered crushing blocks (22); a driving motor (23) is installed on the outer surface of the crushing box (1) at the front end of the crushing roller (2); and the driving motor (23) is connected to the crushing roller (2) through the rotating shaft (21); The surface of the screen drum (3) is evenly provided with screen holes (35) of the same size. The screen drum (3) is rotatably placed on the outer rings of the two crushing rollers (2). The crushing boxes (1) on both sides below the screen drum (3) are longitudinally rotatably installed with guide rollers (4). The guide rollers (4) are supported on the bottom surface of the screen drum (3). The outer surface of the crushing box (1) at the front end of the guide roller (4) is installed with a stepping motor (41). The stepping motor (41) is connected to the guide roller (4) in a transmission manner. The crushing boxes (1) on both sides above the screen drum (3) are also longitudinally rotatably installed with upper rollers (5). The upper rollers (5) are in contact with the outer surface of the screen drum (3). A lever (32) is also fixed obliquely on one side of the lower interior of the screen drum (3), the end of the lever (32) is tilted toward a lower position between the crushing rollers (2), a plurality of levers (32) are evenly fixed in the longitudinal direction, an opening (31) communicating with the outside is opened on the top surface of the screen drum (3), the front end and the rear end of the screen drum (3) are through structures, and inclined guide plates (6) are longitudinally fixed inside the crushing box (1) below both sides of the opening (31), the guide plates (6) are located above the two crushing rollers (2) and tilted toward a position between the crushing rollers (2); A feed port (7) is provided on the surface of the crushing box (1) above the opening (31); a feed hopper (71) connected to the feed port (7) is provided on the surface of the crushing box (1) above the feed port (7); the feed port (7) is aligned with the opening (31); a discharge port (12) is provided at the bottom of the crushing box (1); inclined slopes (121) are provided inside the crushing box (1) on both sides of the discharge port (12).

2. The biomass fuel raw material crushing and screening device according to claim 1, wherein: A baffle (33) is longitudinally arranged inside the sieve drum (3) below the opening (31). The baffle (33) is fixed inside the sieve drum (3) via connecting rods (331) at the four corners of the front and rear ends thereof. The middle position of the baffle (33) is bent toward the opening (31).

3. A biomass fuel raw material crushing and screening device according to claim 1, characterized in that: Side rods (34) are obliquely fixed inside the screen cylinders (3) on both sides of the opening (31), a plurality of side rods (34) are evenly distributed in the longitudinal direction, and the side rods (34) on both sides of the opening (31) are symmetrical to each other.

4. A biomass fuel raw material crushing and screening device according to claim 1, characterized in that: The front end surface of the crushing box (1) is provided with an observation port (13), and a glass (131) is embedded and fixed in the observation port (13).

5. The biomass fuel raw material crushing and screening device according to claim 1, wherein: A rubber pad (42) is fixed around the outer ring of the guide roller (4), and the guide roller (4) is supported by the rubber pad (42) and placed on the outer surface of the screen drum (3).

6. The biomass fuel raw material crushing and screening device according to claim 3, wherein: The spacing between the side bars (34) is equal to the spacing between the shifting bars (32), and the spacing between the side bars (34) and the spacing between the shifting bars (32) are equal to the inner diameter of the sieve hole (35).

7. A biomass fuel raw material crushing and screening device according to claim 1, characterized in that: Inside the crushing box (1) on the outer ring below the feed inlet (7), a guide cover (72) is fixedly installed, and the guide cover (72) is aligned with the opening (31).

8. A biomass fuel raw material crushing and screening device according to claim 1, characterized in that: At the four corners of the bottom of the crushing box (1), support feet (11) are fixedly installed, and there are four support feet (11).

9. The operation method of a biomass fuel raw material crushing and screening device according to any one of claims 1-8, characterized in that, It includes the following steps: Step 1: Connect the driving motor (23) and the stepping motor (41) to the industrial control device and power on the industrial control device. Start the stepping motor (41) to drive the left and right crushing rollers (2) to rotate clockwise and counterclockwise respectively; Step 2: Feed the biomass fuel raw material to be crushed into the feed hopper (71). After passing through the feed inlet (7), under the guiding action of the guide cover (72), it falls downward from the opening (31). Then it moves to both sides on the surface of the baffle (33). The side rod (34) blocks to prevent the raw material from falling outside the guide plate (6) to the outside. And the raw material enters between the two crushing rollers (2) under the guiding action of the guide plate (6). The rotating crushing rollers (2) cooperate with the crushing blocks (22) distributed on their surfaces to crush the raw material of the biomass fuel and let it fall downward; Step 3: Stop adding raw materials. Start the stepping motor (41) to drive the guide rollers (4) on both sides to rotate clockwise, thereby driving the sieve cylinder (3) to rotate counterclockwise. When rotating, the crushed raw materials can be screened through the sieve holes (35) on the surface of the sieve cylinder (3). The raw materials that meet the size requirements fall and are discharged from the discharge port (12), while the raw materials with larger sizes remain in the sieve cylinder (3); Step 4: When the obliquely arranged dial rod (32) rotates counterclockwise to the bottom, it will drive the large pieces of raw materials to rotate counterclockwise together. Finally, it rotates to the upper position, making the dial rod (32) in a state of being obliquely to the left and downward on the upper right side, so that the large pieces of raw materials lifted by the dial slide obliquely and pass through the guide plate (6) and pass between the two crushing rollers (2) again to be crushed again; Step 5: The baffle (33) is located below the crushing roller (2) and above the opening (31) to prevent the crushed raw materials from directly falling out from the opening (31) downward without being screened. The side rods (34) on both sides of the opening (31) can also prevent large pieces of raw materials from sliding to the position of the opening (31) and being discharged. Until the sieve cylinder (3) continues to rotate counterclockwise to the initial position where the opening (31) is aligned with the guide cover (72), raw materials can be added to the inside of the crushing box (1) to continue the crushing work.

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