Corn straw pulverizer for boiler inlet and use method of corn straw pulverizer

Abstract

The invention relates to the technical field of crushers, and provides a corn straw crusher for a boiler inlet and a use method thereof.The corn straw crusher comprises a rack, and a crushing mechanism is arranged at one end of the top of the rack; the crushing mechanism comprises a crushing box fixedly connected to the rack, the top of the crushing box is fixedly connected with a feeding hopper, the inner side of the crushing box is rotationally connected with a rotating shaft, the rotating shaft is fixedly connected with crushing wheels, the bottom of the crushing box is provided with a discharging channel, the inner side of the discharging channel is fixedly connected with a screen, and a motor is fixedly installed on the outer side of the rack. An output shaft of the motor is fixedly connected with the rotating shaft, and a cleaning assembly is arranged on the inner side of the smashing box. A feeding mechanism is arranged below the discharging channel, a discharging hopper is arranged at an outlet of the feeding mechanism, and the discharging hopper is fixedly connected to the end of the machine frame. Through the innovative cleaning assembly, the air heater and the intermittent feeding mechanism, the key technical defects of an existing pulverizer are comprehensively overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulverizer, in particular, relates to a corn straw pulverizer for boiler inlet and a using method thereof. BACKGROUND

[0002] In the field of biomass fuel processing, the existing corn straw pulverizer usually adopts a mechanical pulverizing wheel and a fixed screen structure. When working, the motor drives the rotating shaft to rotate the pulverizing wheel to crush the straw, and the crushed material is discharged through the screen, and the substandard material is left on the screen surface. The feeding mechanism usually uses a continuous conveyor belt to feed the crushed material into the boiler. However, this design is too simple and has certain technical defects:

[0003] Firstly, the screen of the existing pulverizer is easy to be blocked by material adhesion when pulverizing wet or fibrous straw. This not only reduces the screening efficiency, but also may cause equipment downtime for cleaning and interrupt the production process.

[0004] Secondly, the existing pulverizing equipment lacks a reprocessing mechanism for substandard materials. The large particle materials on the screen are usually discarded or manually cleaned, causing resource waste.

[0005] Thirdly, the existing feeding mechanism usually adopts a continuous operation mode, but the pulverizing process is intermittent (such as screen cleaning period), which causes the accumulation or uneven transportation of crushed material, affecting the stability of boiler combustion.

[0006] Fourthly, the straw often contains moisture, and the existing technology lacks drying measures. Wet material is easy to adhere to the inner wall of the pulverizing box or the screen, reducing the pulverizing effect and promoting mold growth.

[0007] Therefore, the present application provides a corn straw pulverizer for boiler inlet and a using method thereof. SUMMARY

[0008] The present application provides a corn straw pulverizer for boiler inlet and a using method thereof, which solves the problem of material adhesion and blockage in the prior art.

[0009] The technical solution of the present application is as follows: a corn straw pulverizer for boiler inlet, comprising a rack, one end of the top of the rack is provided with a pulverizing mechanism;

[0010] The pulverizing mechanism comprises a pulverizing box fixedly connected to the rack, a feeding hopper fixedly connected to the top of the pulverizing box, a rotating shaft rotatably connected to the inner side of the pulverizing box, a pulverizing wheel fixedly connected to the rotating shaft, a discharge channel formed in the bottom of the pulverizing box, a screen fixedly connected to the inner side of the discharge channel, a motor fixedly installed on the outer side of the rack, an output shaft of the motor fixedly connected to the rotating shaft, and a cleaning assembly arranged in the inner side of the pulverizing box and configured to clean the top surface of the screen by cooperating with the rotation of the rotating shaft.

[0011] A feeding mechanism is arranged below the discharge channel and configured to convey the crushed materials by cooperating with the start of the motor, and a discharge hopper is arranged at the outlet of the feeding mechanism and configured to guide the crushed materials into the boiler inlet and is fixedly connected to the end of the rack.

[0012] Preferably, a hot air blower is fixedly installed on the outer side of the rack, an air outlet of the hot air blower is fixedly connected to an air duct, and the outlet end of the air duct is communicated with the interior of the pulverizing box.

[0013] Preferably, the cleaning assembly comprises two sleeves arranged on the two ends of the rotating shaft respectively, the two sleeves are rotatably connected to the inner wall of the pulverizing box, an arc-shaped plate is fixedly connected to one side of each of the two sleeves, a scraping piece is fixedly connected to the end of the arc-shaped plate and abuts against the inner wall of the pulverizing box, and a transmission piece is arranged on the outer side of the pulverizing box and configured to drive the sleeves to rotate by cooperating with the rotation of the rotating shaft.

[0014] Preferably, the scraping piece comprises a scraping plate, an installation groove is formed in the inner side of the arc-shaped plate and configured to slideably cooperate with the scraping plate, one end of the scraping plate abuts against the inner wall of the pulverizing box, the other end of the scraping plate is fixedly connected to a spring, and one end of the spring away from the scraping plate abuts against the inner wall of the installation groove.

[0015] Preferably, the transmission piece comprises a first gear fixedly connected to the end of the rotating shaft, a second gear rotatably connected to the outer side of the pulverizing box and engaged with the first gear, a third gear coaxially fixedly connected to the first gear, and a fourth gear fixedly connected to the end of one of the sleeves and engaged with the third gear.

[0016] Preferably, the second gear and the third gear have the same number of teeth, the first gear and the fourth gear have the same number of teeth, and the number of teeth of the first gear and the second gear is in a ratio of 10:1.

[0017] Preferably, the feeding mechanism comprises two conveying rollers arranged in parallel, the two conveying rollers are rotatably connected to the inner side of the rack, a feeding belt is arranged between the two conveying rollers, the two conveying rollers are drivingly connected through the feeding belt, and a linkage is arranged on the outer side of the rack and configured to drive the conveying rollers to rotate intermittently by cooperating with the start of the motor.

[0018] Preferably, the linkage includes a rotating seat fixed coaxially with the conveying roller, the outer edge of the conveying roller is provided with a plurality of docking grooves arranged in a circumferential array, the outer side of the frame is rotatably connected to an incomplete rotating wheel that is tangent to the rotating seat, a connecting plate is fixedly connected to the notch of the incomplete rotating wheel, and a driving block is fixedly connected to one end of the connecting plate, the driving block intermittently engaging with any docking groove by cooperating with the incomplete rotating wheel.

[0019] Preferably, the linkage further includes a first pulley fixedly connected coaxially with the incomplete rotating wheel, and a second pulley fixedly connected to the output shaft of the motor, wherein the second pulley and the first pulley are connected by belt drive.

[0020] The present invention also provides a method of using a corn stalk crusher for boiler inlet, comprising the following steps:

[0021] S1. By feeding corn stalks into the crushing box through the feed hopper, and then starting the motor to drive the rotating shaft to rotate at high speed and crush the corn stalks.

[0022] S2. The crushed straw fragments are screened through a sieve. The screened fragments pass through the sieve and are discharged from the discharge channel. The straw fragments that are not completely crushed remain on the top surface of the sieve.

[0023] S3. During the rotation of the shaft, the cleaning component cleans the top surface of the screen to prevent the screen from being blocked. Then, the incompletely crushed straw material is reintroduced into the crushing area of ​​the crushing wheel for secondary crushing.

[0024] S4. The discharge channel guides the crushed material to the feeding mechanism, which then feeds the crushed material into the discharge hopper. Finally, the crushed material is fed into the boiler inlet through the discharge hopper.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. By installing a cleaning component inside the crushing box, which includes a sleeve shaft, an arc plate, and a scraper, the uncrushed material on the screen is scraped off in real time through the rotation of the shaft, and the top surface of the screen is automatically cleaned, avoiding material accumulation and blockage. The scraper adopts a spring buffer design, which makes the scraper adapt to the unevenness of the screen surface, avoiding hard contact that could damage the equipment and extending its service life.

[0027] 2. The cleaning component re-introduces the substandard materials on the screen into the crushing wheel area for secondary crushing. The design of the arc plate and scraper guides the scraped materials to the crushing area, forming a closed-loop circulation. This improves the material crushing rate and enhances the uniformity of the crushed materials, which is beneficial to the stability of boiler combustion.

[0028] 3. By adopting an intermittent feeding mechanism, batch conveying is achieved through linkage and synchronization with the motor. The design of the incomplete rotating wheel and drive block in the linkage makes the conveying roller rotate intermittently, which is synchronized with the screen cleaning cycle. The feeding process is precisely matched with the crushing rhythm, avoiding material fluctuations at the boiler inlet and improving combustion efficiency.

[0029] 4. By adding a hot air blower to the outside of the frame, hot air is blown into the crushing box through the air duct. The hot air drying reduces the humidity of the straw, prevents the screen and inner wall from sticking, and inhibits mold growth. The dried crushed material has better flowability, which improves the screening and conveying efficiency. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a schematic diagram of the structure of a corn stalk crusher for boiler inlet according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the crushing mechanism according to an embodiment of the present invention. Figure One ;

[0033] Figure 3 This is a schematic diagram of the crushing mechanism according to an embodiment of the present invention. Figure Two ;

[0034] Figure 4 This is a schematic diagram of the structure of the cleaning component according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the scraper component according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the transmission component according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the feeding mechanism according to an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the linkage component according to an embodiment of the present invention.

[0039] In the diagram: 1. Frame; 2. Crushing mechanism; 21. Crushing box; 22. Feed hopper; 23. Rotating shaft; 24. Crushing wheel; 25. Discharge channel; 26. Screen; 27. Cleaning component; 271. Sleeve shaft; 272. Connecting rod; 273. Arc plate; 274. Scraper; 2741. Scraper plate; 2742. Mounting groove; 2743. Spring; 28. Motor; 29. ​​Transmission component; 291. First gear; 292. Second gear; 293. Third gear; 294. Fourth gear; 3. Hot air blower; 4. Air duct; 5. Feeding mechanism; 51. Conveying roller; 52. Feeding belt; 53. Linkage component; 531. Rotating seat; 532. Connecting groove; 533. Incomplete rotating wheel; 534. Connecting plate; 535. Drive block; 536. First pulley; 537. Second pulley; 6. Discharge hopper. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figures 1 to 8 As shown, this embodiment proposes a corn stalk crusher for boiler inlet, including a frame 1, and a crushing mechanism 2 is provided at one end of the top of the frame 1;

[0042] The crushing mechanism 2 includes a crushing box 21 fixedly connected to the frame 1. A feed hopper 22 is fixedly connected to the top of the crushing box 21. A rotating shaft 23 is rotatably connected to the inner side of the crushing box 21. A crushing wheel 24 is fixedly connected to the rotating shaft 23. A discharge channel 25 is opened at the bottom of the crushing box 21. A screen 26 is fixedly connected to the inner side of the discharge channel 25. A motor 28 is fixedly installed on the outer side of the frame 1. The output shaft of the motor 28 is fixedly connected to the rotating shaft 23. A cleaning component 27 is provided on the inner side of the crushing box 21 to clean the top surface of the screen 26 by cooperating with the rotation of the rotating shaft 23.

[0043] Below the discharge channel 25 is a feeding mechanism 5 that conveys the crushed material by cooperating with the start of the motor 28. The outlet of the feeding mechanism 5 is provided with a discharge hopper 6 for introducing the crushed material into the boiler inlet. The discharge hopper 6 is fixedly connected to the end of the frame 1.

[0044] In this embodiment, during operation, corn stalks enter the crushing box 21 through the feed hopper 22. The motor 28 drives the rotating shaft 23 to rotate at high speed, which drives the crushing wheel 24 to crush the stalks. The crushed material is screened through the bottom screen 26. Qualified crushed material falls from the discharge channel 25, while the incompletely crushed material remains on the top surface of the screen 26. It is cleaned and re-crushed by the cleaning component 27. The feeding mechanism 5 transports the crushed material to the unloading hopper 6 and finally introduces it into the boiler inlet. The whole process realizes continuous automated operation. Through integrated design, the material transfer links are reduced and energy loss is reduced.

[0045] In a further preferred embodiment of the present invention, a hot air blower 3 is fixedly installed on the outside of the frame 1, and an air guide pipe 4 is fixedly connected to the air outlet of the hot air blower 3. The outlet end of the air guide pipe 4 communicates with the inside of the crushing box 21.

[0046] In this embodiment, during operation, the hot air blower 3 blows hot air into the crushing box 21, which comes into contact with the straw material during the crushing process. The hot air can dry the damp straw and promote the flow of the crushed material, preventing the material from sticking to the screen 26 or the inner wall of the crushing box 21. The hot air drying reduces the humidity of the material, avoiding the screen 26 from being blocked by damp material. The dried straw is easier to crush, improving the uniformity of the crushed material and the combustion efficiency.

[0047] In a further preferred embodiment of the present invention, the cleaning component 27 includes two sleeves 271 respectively sleeved at both ends of the rotating shaft 23. Both sleeves 271 are rotatably connected to the inner wall of the crushing box 21. An arc-shaped plate 273 is fixedly connected to one side of each sleeve 271. A scraper 274 that abuts against the inner wall of the crushing box 21 is fixedly connected to the end of the arc-shaped plate 273. A transmission component 29 is provided on the outside of the crushing box 21 to drive the sleeves 271 to rotate by cooperating with the rotation of the rotating shaft 23.

[0048] In this embodiment, driven by the transmission component 29, the sleeve shaft 271 drives the arc plate 273 and the scraper component 274 to rotate slowly. The scraper component abuts against the top surface of the screen 26. During the rotation of the rotating shaft 23, the scraper component 274 scrapes up the uncrushed material and reintroduces it into the crushing area, achieving real-time cleaning. The automatic cleaning mechanism ensures that the screen is unobstructed, improving screening efficiency and continuous operation capability. The uncrushed material is recycled, improving the crushing rate and material utilization rate.

[0049] In a further preferred embodiment of the present invention, the scraper 274 includes a scraper 2741, and an installation groove 2742 that slides with the scraper 2741 is provided on the inner side of the arc plate 273. One end of the scraper 2741 abuts against the inner wall of the crushing box 21, and a spring 2743 is fixedly connected to the other end of the scraper 2741. The end of the spring 2743 away from the scraper 2741 abuts against the inner wall of the installation groove 2742.

[0050] In this embodiment, the scraper 2741 is slidably installed in the mounting groove of the arc plate 273. The spring 2743 provides elasticity to keep one end of the scraper 2741 in close contact with the inner wall of the crushing box 21 or the screen 26. When the sleeve shaft 271 rotates, the scraper 271 adapts to the unevenness of the screen surface. The spring 2743 buffers the scraping effect to ensure uniform scraping and avoids damage to the equipment due to hard contact. The spring 2743 design makes the scraper 271 fit the screen 26, which improves the thoroughness and reliability of cleaning. The buffering effect reduces wear and reduces the replacement frequency.

[0051] In a further preferred embodiment of the present invention, the transmission component 29 includes a first gear 291 fixedly connected to the end of the rotating shaft 23, a second gear 292 rotatably connected to the outside of the crushing box 21, the second gear 292 meshing with the first gear 291, a third gear 293 fixedly connected to the first gear 291 on the same axis, and a fourth gear 294 meshing with the third gear 293 fixedly connected to the end of one of the sleeve shafts 271. The second gear 292 and the third gear 293 have the same number of teeth, the first gear 291 and the fourth gear 294 have the same number of teeth, and the tooth ratio of the first gear 291 to the second gear 292 is 10:1.

[0052] In this embodiment, the gear ratio of the first gear to the second gear is 10:1, and the other gears have the same number of teeth. This reduces the high-speed rotation of the shaft 23 and transmits it to the cleaning component 27, making the cleaning action slow and stable. The gear ratio optimization makes the cleaning component 27 match the pulverizing rhythm, avoiding over-cleaning or waste of resources. It utilizes the existing motor power and does not require an additional drive device, thus reducing costs.

[0053] In a further preferred embodiment of the present invention, the feeding mechanism 5 includes two parallel conveying rollers 51, both of which are rotatably connected to the inner side of the frame 1. A feeding belt 52 is provided between the two conveying rollers 51, and the two conveying rollers 51 are connected by transmission through the feeding belt 52. A linkage 53 is provided on the outer side of the frame 1, which drives the conveying rollers 51 to rotate intermittently by cooperating with the start of the motor 28. The linkage 53 includes a rotating seat 531 coaxially fixed with the conveying rollers 51. A plurality of docking grooves 53 arranged in a circumferential array are formed on the outer edge of the conveying rollers 51. 2. An incomplete rotating wheel 533, which is tangent to the rotating seat 531, is rotatably connected to the outer side of the frame 1. A connecting plate 534 is fixedly connected to the notch of the incomplete rotating wheel 533. A driving block 535 is fixedly connected to one end of the connecting plate 534. The driving block 535 is intermittently engaged with any mating groove 532 by cooperating with the incomplete rotating wheel 533. A first pulley 536 is fixedly connected to the incomplete rotating wheel 533 on the same axis. A second pulley 537 is fixedly connected to the output shaft of the motor 28. The second pulley 537 and the first pulley 536 are connected by belt drive.

[0054] In this embodiment, the rotating conveyor roller drives the feeding belt to transport the crushed material falling from the discharge channel 25 to the unloading hopper 6. The incomplete rotating wheel 533 is driven to rotate by the motor 28. The incomplete rotating wheel 533 is connected to the output shaft of the motor 28 via a belt. When the incomplete rotating wheel 533 rotates, the drive block 535 and the docking groove 532 intermittently cooperate to drive the conveyor roller 51 to rotate in a stepping manner. This design realizes the intermittent conveying of the feeding belt 52, which is synchronized with the crushing process, realizing the batch conveying of crushed material and avoiding blockage or excessive accumulation. The incomplete rotating wheel 533 mechanism ensures precise synchronization between feeding and crushing, optimizes the material flow, and reduces electronic control components through mechanical linkage, improving durability and ease of maintenance.

[0055] A further preferred embodiment of the present invention provides a method for using a corn stalk crusher for boiler inlet, comprising the following steps:

[0056] S1. By feeding corn stalks into the crushing box 21 through the feed hopper 22, and then starting the motor 28 to drive the rotating shaft 23 to rotate, the corn stalks are crushed at high speed.

[0057] S2. The crushed straw fragments are screened through the screen 26. The screened fragments pass through the screen 26 and are discharged from the discharge channel 25. The straw fragments that are not completely crushed remain on the top surface of the screen 26.

[0058] S3. During the rotation of the rotating shaft 23, the cleaning component 27 cleans the top surface of the screen 26 to prevent the screen 26 from being blocked. Then, the incompletely crushed straw material is reintroduced into the crushing area of ​​the crushing wheel 24 for secondary crushing.

[0059] S4. The discharge channel 25 guides the crushed material to the feeding mechanism 5, and then the feeding mechanism 5 feeds the crushed material into the discharge hopper 6. Finally, the discharge hopper 6 feeds the crushed material into the boiler inlet.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corn stalk crusher for boiler inlet, comprising a frame (1), characterized in that, A crushing mechanism (2) is provided at one end of the top of the frame (1); The crushing mechanism (2) includes a crushing box (21) fixedly connected to the frame (1), a feeding hopper (22) fixedly connected to the top of the crushing box (21), a rotating shaft (23) rotatably connected to the inner side of the crushing box (21), a crushing wheel (24) fixedly connected to the rotating shaft (23), a discharge channel (25) opened at the bottom of the crushing box (21), a screen (26) fixedly connected to the inner side of the discharge channel (25), a motor (28) fixedly installed on the outer side of the frame (1), the output shaft of the motor (28) fixedly connected to the rotating shaft (23), and a cleaning component (27) provided on the inner side of the crushing box (21) to clean the top surface of the screen (26) by cooperating with the rotation of the rotating shaft (23). Below the discharge channel (25) is a feeding mechanism (5) that conveys the crushed material by cooperating with the start of the motor (28). The outlet of the feeding mechanism (5) is provided with a discharge hopper (6) for introducing the crushed material into the boiler inlet. The discharge hopper (6) is fixedly connected to the end of the frame (1).

2. A corn stalk crusher for boiler inlet according to claim 1, characterized in that, A hot air blower (3) is fixedly installed on the outside of the frame (1). The air outlet of the hot air blower (3) is fixedly connected to an air guide pipe (4). The outlet end of the air guide pipe (4) is connected to the inside of the crushing box (21).

3. A corn stalk crusher for boiler inlet according to claim 1, characterized in that, The cleaning component (27) includes two sleeves (271) respectively fitted on both ends of the rotating shaft (23). Both sleeves (271) are rotatably connected to the inner wall of the crushing box (21). An arc plate (273) is fixedly connected to one side of each sleeve (271). A scraper (274) that abuts against the inner wall of the crushing box (21) is fixedly connected to the end of the arc plate (273). A transmission component (29) is provided on the outside of the crushing box (21) to drive the sleeves (271) to rotate by cooperating with the rotation of the rotating shaft (23).

4. A corn stalk crusher for boiler inlet according to claim 3, characterized in that, The scraper (274) includes a scraper (2741). The inner side of the arc plate (273) is provided with a mounting groove (2742) that slides with the scraper (2741). One end of the scraper (2741) abuts against the inner wall of the crushing box (21). The other end of the scraper (2741) is fixedly connected to a spring (2743). The end of the spring (2743) away from the scraper (2741) abuts against the inner wall of the mounting groove (2742).

5. A corn stalk crusher for boiler inlet according to claim 3, characterized in that, The transmission component (29) includes a first gear (291) fixedly connected to the end of the rotating shaft (23), a second gear (292) rotatably connected to the outside of the crushing box (21), the second gear (292) meshing with the first gear (291), the first gear (291) being coaxially fixedly connected with a third gear (293), and a fourth gear (294) meshing with the third gear (293) being fixedly connected to the end of one of the sleeve shafts (271).

6. A corn stalk crusher for boiler inlet according to claim 5, characterized in that, The second gear (292) and the third gear (293) have the same number of teeth, the first gear (291) and the fourth gear (294) have the same number of teeth, and the ratio of the number of teeth of the first gear (291) to the number of teeth of the second gear (292) is 10:

1.

7. A corn stalk crusher for boiler inlet according to claim 1, characterized in that, The feeding mechanism (5) includes two parallel conveying rollers (51), both of which are rotatably connected to the inside of the frame (1). A feeding belt (52) is provided between the two conveying rollers (51), and the two conveying rollers (51) are connected by transmission through the feeding belt (52). A linkage (53) is provided on the outside of the frame (1) to drive the conveying rollers (51) to rotate intermittently by cooperating with the start of the motor (28).

8. A corn stalk crusher for boiler inlet according to claim 7, characterized in that, The linkage (53) includes a rotating seat (531) fixed coaxially with the conveying roller (51). The outer edge of the conveying roller (51) is provided with a plurality of docking grooves (532) arranged in a circumferential array. The outer side of the frame (1) is rotatably connected to an incomplete rotating wheel (533) that is tangent to the rotating seat (531). A connecting plate (534) is fixedly connected to the notch of the incomplete rotating wheel (533). A driving block (535) is fixedly connected to one end of the connecting plate (534). The driving block (535) is intermittently engaged with any docking groove (532) by cooperating with the incomplete rotating wheel (533).

9. A corn stalk crusher for boiler inlet according to claim 8, characterized in that, The linkage (53) also includes a first pulley (536) that is coaxially fixedly connected to the incomplete rotating wheel (533), and a second pulley (537) is fixedly connected to the output shaft of the motor (28). The second pulley (537) and the first pulley (536) are connected by belt drive.

10. A method of using a corn stalk crusher for boiler inlet according to claim 2, characterized in that, Includes the following steps: S1. By feeding corn stalks into the crushing box (21) through the feed hopper (22), and then starting the motor (28) to drive the rotating shaft (23) to rotate, the corn stalks are crushed at high speed. S2. The crushed straw fragments are screened through the screen (26). The screened fragments pass through the screen (26) and are discharged from the discharge channel (25). The straw fragments that are not completely crushed remain on the top surface of the screen (26). S3. During the rotation of the shaft (23), the cleaning component (27) cleans the top surface of the screen (26) to prevent the screen (26) from being blocked. Then, the incompletely crushed straw material is reintroduced into the crushing area of ​​the crushing wheel (24) for secondary crushing. S4. The discharge channel (25) guides the crushed material to the feeding mechanism (5), and then the feeding mechanism (5) feeds the crushed material into the unloading hopper (6), and finally the unloading hopper (6) feeds the crushed material into the boiler inlet.

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