Straw stalk smashing device

Abstract

The utility model relates to the field of rice straw treatment equipment, in particular to a rice straw smashing device which comprises a first conveying unit and a second conveying unit. The smashing unit is used for receiving the straw input by the first conveying unit and smashing the straw, and a screen is arranged at the output end of the smashing unit; the suction unit is used for sucking out the crushed straw conforming to the specified particle size; the straw recycling device has the advantages that the straw recycling cost is greatly reduced, the regeneration value is improved, farmers can sell straw to obtain profits and can also obtain profits by recycling regenerated straw and selling straw fuel particles, the enthusiasm of the farmers to clean the straw is improved, and the straw burning phenomenon is avoided; the equipment is provided with the cutting tool and the multiple smashing tools, the straw smashing efficiency and effect are effectively improved, meanwhile, the screen is arranged, only straw smashed objects with the small particle size can be output for granulation, and the quality of straw fuel particles is improved.

Description

Technical Field

[0001] The utility model relates to the field of rice straw treatment equipment, in particular to a rice straw crushing device. Background Art

[0002] Straw is the general term for the stems and leaves of mature crops, usually referring to the remaining parts after harvesting the grains of coarse grains such as wheat, rice, corn, potatoes, rapeseed, cotton, etc. In the past, the treatment of straw usually adopted the method of burning. However, considering the environmental damage, public health, safety hazards and other problems caused by straw burning, the burning of straw has been completely prohibited at present. Especially in the southern regions, rice can be planted in multiple seasons, and a large amount of rice straw will be produced in each season, resulting in high labor costs and low efficiency in the harvesting and treatment of rice straw.

[0003] When using rice straw as fuel, the existing treatment methods mostly adopt direct combustion. However, when burning directly, the rice straw will produce a lot of grass ash. The grass ash is relatively light and cannot stay in the furnace for a long time. However, the grass ash retains a high amount of heat energy, and this heat energy will be discharged with the discharge of the grass ash, resulting in waste of heat energy. Therefore, when using rice straw as fuel, there will be defects such as low calorific value and a lot of ash.

[0004] The applicant proposes a process of crushing and compressing rice straw to form a higher density form to improve the energy density and combustion efficiency of rice straw. In this preparation process, it is necessary to first crush the rice straw. In order to achieve the automated, low-cost production, high enthusiasm for recycling of rice straw, and improve the income of farmers from rice straw recycling, this case is thus proposed. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a rice straw crushing device for realizing the low-cost and automated crushing of rice straw.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A rice straw crushing device includes:

[0008] A first conveying unit for inputting rice straw to the next process;

[0009] A crushing unit for receiving the rice straw input by the first conveying unit and crushing it. A sieve is provided at the output end of the crushing unit;

[0010] A suction unit, the input port of which is connected to the output end of the crushing unit, for sucking out the crushed rice straw that meets the specified particle size.

[0011] Further, the crushing unit includes a crushing chamber, in which a crushing tool is provided. The input port of the crushing chamber receives the output port of the first conveying unit, and the screen is installed at the output port of the crushing chamber.

[0012] Further, a cutting tool is provided in the crushing chamber. The cutting tool includes a cutting tool rotating shaft and a plurality of cutting blades fixed circumferentially on the cutting tool rotating shaft. The cutting blades cut the straw into multiple segments and throw them towards the side of the crushing tool, and the crushing tool is used to crush the segmented straw.

[0013] Further, there are multiple crushing tools, and the multiple crushing tools are arranged vertically. The output port of the crushing chamber is arranged below the lowermost crushing tool.

[0014] Further, the crushing tool includes a crushing tool rotating shaft, a plurality of fixed shafts, a plurality of fixed crushing blades and a plurality of movable crushing blades. The fixed crushing blade includes a polygonal substrate, a rotating shaft mounting hole opened in the middle of the substrate, a plurality of fixed shaft mounting holes one opened on the substrate and located circumferentially of the rotating shaft mounting hole, and cutting edges located on each side of the substrate; the movable crushing blade is strip-shaped, including a fixed shaft mounting hole two provided at one end and a cutting edge provided on the edge of the movable crushing blade.

[0015] A plurality of the fixed crushing blades are arranged in parallel along the axial direction of the crushing tool rotating shaft and are fixed to the crushing tool rotating shaft. The fixed shaft mounting holes one on adjacent two fixed crushing blades correspond to each other. The fixed shaft passes through the corresponding plurality of fixed shaft mounting holes one and is fixedly connected to the fixed crushing blade. An annular groove is opened on the mounting shaft between adjacent two fixed crushing blades. The movable crushing blade is movably connected to the annular groove of the fixed shaft through the fixed shaft mounting hole two at the end.

[0016] Further, the cutting edges on each side of the substrate include straight edges and / or serrated edges.

[0017] Further, the cutting edges on the movable crushing blade include straight edges and / or serrated edges.

[0018] Further, a reinforcing plate is provided between adjacent two fixed crushing blades. Both ends of the reinforcing plate are fixed to the adjacent two fixed crushing blades, and the bottom is fixed to the crushing tool rotating shaft.

[0019] Further, it includes a blowing unit. An air inlet is opened on the top surface of the crushing chamber, and the air inlet is located directly above the crushing tool. The suction port of the blowing unit is used to suck in external air, and the air outlet of the blowing unit is connected to the air inlet on the top surface of the crushing chamber, and is used to blow the crushed straw on the crushing tool towards the screen.

[0020] The advantages of the present utility model are as follows:

[0021] 1. By crushing and granulating straw, the straw is compressed into a form with a higher density, improving the energy density and combustion efficiency. During combustion, the heat can be locked in the furnace, thus enhancing the calorific value. The device has a simple structure, is economical and practical, and can be placed in a warehouse near the paddy field to promptly process the collected straw and produce straw pellet fuel. This significantly reduces the cost of straw recycling and enhances the recycling value. Farmers can either sell the straw for profit or recycle the straw and sell the straw pellet fuel to obtain profits, which increases the enthusiasm of farmers to clean up the straw and avoids the occurrence of straw burning. 2. The device is equipped with cutting tools and multiple crushing tools, effectively improving the efficiency and effect of straw crushing. At the same time, a sieve is configured, so that only straw crushed materials with a smaller particle size can be output for granulation, improving the quality of straw fuel pellets.

[0022] 3. By using blowing and suction to convey the crushed straw materials, the problem of difficult conveyance of light particulate matter is solved. At the same time, a wind separator suitable for the crushed straw materials is developed, which effectively separates the wind, and has the advantages of high automation, less dust pollution in the working environment, and high efficiency and safety. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structure schematic diagram of the straw crushing and pellet forming equipment in the embodiment;

[0024] Figure 2 It is a three-dimensional structure schematic diagram of the straw crushing equipment in the embodiment;

[0025] Figure 3 For Figure 2 A schematic diagram of the structure from another perspective;

[0026] Figure 4 For Figure 3 A schematic diagram of the internal structure;

[0027] Figure 5 It is a schematic diagram of the structure of the crushing tool and the cutting tool in the embodiment;

[0028] Figure 6 It is a schematic diagram of the structure of the crushing tool in the embodiment;

[0029] Figure 7 It is an exploded view of the fixed crushing blade and the movable crushing blade in the crushing tool of the embodiment;

[0030] Figure 8 It is a schematic diagram of the structure of the wind separation unit in the embodiment;

[0031] Figure 9 It is a sectional view schematic diagram of the wind separation unit in the embodiment;

[0032] Figure 10 Schematic structural diagram of the particle forming unit in the embodiment;

[0033] Figure 11 Schematic internal structure diagram of the particle forming unit in the embodiment;

[0034] Figure 12 Schematic cross-sectional view of the particle forming unit in the embodiment;

[0035] Label description

[0036] 1. First conveying unit; 101. Guide cover; 102. Conveyor belt; 103. Tension adjusting mechanism; 104. Protection plate;

[0037] 2. Crushing unit; 201. Crushing chamber; 202. Cutting tool; 2021. Cutting tool rotating shaft; 2022. Cutting blade; 203. Crushing tool; 2031. Crushing tool rotating shaft; 2032. Fixed shaft; 20321. Annular groove; 2033. Movable crushing blade; 20331. Second fixed shaft mounting hole; 20332. Blade edge; 2034. Fixed crushing blade; 20341. Rotating shaft mounting hole; 20342. First fixed shaft mounting hole; 20343. Blade edge; 2035. Reinforcing plate; 204. Air supply unit; 205. Screen;

[0038] 3. Suction unit;

[0039] 4. Air and material separation unit; 401. Conical cylinder; 4011. Tangential feed inlet; 402. Exhaust pipe; 403. Guide air duct; 404. Rotary discharge valve; 4041. Discharge blade; 405. First recovery pipe; 406. Second recovery pipe; 407. Bag filter;

[0040] 5. Second conveying unit;

[0041] 6. Particle forming unit; 601. Pressure feeding rotating shaft; 602. Fixed disk; 6021. Flared opening; 603. Rotating disk; 6031. Breaking rib; 604. Pressure feeding roller; 605. Pressure feeding driving part; 606. Pressure roller coupling shaft; 607. Particle outlet; 608. Feeding chute. Detailed implementation manners

[0042] The following further describes the present utility model in detail with reference to the embodiments. It should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. in the text are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0043] This embodiment provides a rice straw crushing and granulating equipment, such as Figure 1 shown, which includes a first conveying unit 1, a crushing unit 2, a suction unit 3, an air separation unit 4, a second conveying unit 5 and a granulating unit 6.

[0044] As Figure 1 and Figure 4 shown, the first conveying unit 1 includes a conveyor belt 102 and a guiding cover 101. The guiding cover 101 encloses the conveyor belt 102 and forms a constriction near the crushing unit 2. Workers place the recycled rice on the conveyor belt 102, and the conveyor belt 102 transports the rice straw to the crushing unit 2. The constriction formed by the guiding cover 101 can concentrate the rice to the input port of the crushing unit 2, enabling effective crushing treatment. Preferably, a tension adjusting mechanism 103 is provided at the conveyor belt 102 to adjust the tension of the conveyor belt 102 at any time. As Figure 2 shown, in this embodiment, the motors for driving the crushing unit 2 and the first conveying unit 1 are installed below the conveyor belt 102. To prevent the rice straw and its powder falling from the gaps in the outer shell of the first conveying unit 1 from entering the motor and causing motor failure, a protective plate 104 is also provided at the position between the motor and the lower part of the first conveying unit 1 to block the rice straw and its powder from entering the motor.

[0045] As Figure 4 shown, the crushing unit 2 includes a crushing chamber 201. Inside the crushing chamber 201, there are a cutting tool 202 and two crushing tools 203. The input port of the crushing chamber 201 receives the output port of the first conveying unit 1. The two crushing tools 203 are arranged vertically. The output port of the crushing chamber 201 is located below the lowermost crushing tool 203, and a screen 205 is installed at the output port. As Figure 5 shown, the cutting tool 202 includes a cutting tool rotating shaft 2021 and a plurality of cutting blades 2022 fixed circumferentially on the cutting tool rotating shaft 202. The cutting blades 2022 cut the rice straw into multiple small segments and throw them towards the side of the crushing tool 203, which can reduce the crushing pressure on the subsequent crushing tool 203. The crushing tool 203 is used to crush the segmented rice straw into powder.

[0046] As Figure 6 and Figure 7As shown in the figure, the crushing tool 203 includes a crushing tool rotating shaft 2031, four fixed shafts 2032, five fixed crushing blades 2034 and a plurality of movable crushing blades 2033. The fixed crushing blade 2034 includes a polygonal substrate, a rotating shaft mounting hole 20341 opened in the middle of the substrate, four first fixed shaft mounting holes 20342 opened on the substrate and circumferentially located around the rotating shaft mounting hole 20341, and cutting edges 20343 located on each side of the substrate; the movable crushing blade 2033 is strip-shaped, including a second fixed shaft mounting hole 20331 provided at one end and a cutting edge 20332 provided on the edge of the movable crushing blade; the five fixed crushing blades 2034 are arranged in parallel along the axial direction of the crushing tool rotating shaft 2031 and are fixed to the crushing tool rotating shaft 2031. The first fixed shaft mounting holes 20342 on adjacent two fixed crushing blades 2034 correspond to each other. The four fixed shafts 2032 pass through the corresponding four first fixed shaft mounting holes 20342 and are fixedly connected to the fixed crushing blades 2034. A plurality of annular grooves 20321 are opened on the mounting shaft between adjacent two fixed crushing blades 2034. The movable crushing blade 2033 is movably connected to the annular groove 20321 of the fixed shaft 2032 through the second fixed shaft mounting hole 20331 at the end. Three movable crushing blades 2033 are arranged between a pair of adjacent fixed crushing blades 2034 on one fixed shaft 2032. As Figure 7 shown, the cutting edges 20343 on each side of the substrate include straight edges and serrated edges, and the cutting edge 20332 on the movable crushing blade is a serrated edge.

[0047] The fixed crushing blade 2034 and the movable crushing blade 2033 are used to crush the cut straw into powder. The straight edges on the blade are smooth, continuous and have no serrations, forming a continuous sharp edge as a whole, which is suitable for cutting the softer or medium-hard parts of the straw; the serrated edges on the blade have serrated concave and convex structures, and each serration has a sharp cutting point, which is especially suitable for cutting the hard or elastic parts of the straw. The movable setting of the movable crushing blade 2033 causes the movable crushing blade 2033 to radially disperse under the action of centrifugal force when the rotating shaft of the crushing tool 203 rotates, so that the cutting range of the crushing tool 203 is larger. At the same time, when encountering hard objects, it can play a certain buffering role to avoid the movable crushing blade 2033 from being broken. The double-layer crushing tool 203 can fully cut the straw. At the same time, a screen 205 is arranged at the bottom to ensure that only the straw powder with a specified particle size can be sucked out for granulation.

[0048] The straw powder is very light and cannot reach the screen 205 smoothly under the rotation of the crushing tool 203. To solve this defect, this embodiment further includes a blowing unit 204. The blowing unit 204 uses a vortex blower. An air inlet is provided on the top surface of the crushing chamber 201, and the air inlet is directly above the uppermost crushing tool 203. The suction port of the blowing unit 204 is used to suck in external air, and the air outlet of the blowing unit 204 is connected to the air inlet on the top surface of the crushing chamber 201, for blowing the straw crushed material on the crushing tool 203 towards the screen 205.

[0049] As Figure 6 shown, preferably, this embodiment further provides a reinforcing plate 2035 between two adjacent fixed crushing blades 2034. Both ends of the reinforcing plate 2035 are fixed to the two fixed crushing blades 2034, and the bottom is fixed to the crushing tool rotating shaft 2031 to improve the overall strength and stability of the crushing tool 203.

[0050] The suction unit 3 uses a turbo fan, whose input port is connected to the output end of the crushing unit 2 for sucking out the straw crushed material that meets the specified particle size, and its output port is connected to the input port of the air separation unit 4.

[0051] The air separation unit 4 uses a cyclone separator and a rotary discharge valve 404, for receiving the air and the straw crushed material output from the suction unit 3 and separating the air and the straw crushed material. The existing cyclone separator is shown in Patent 201922063312.8. A tangential feed inlet 4011 is provided in the upper section of the conical cylinder 401 body. At the same time, an exhaust pipe 402 inserted into the cylinder to a certain depth is installed at the center of the top. The discharge port is provided at the bottom of the cylinder. The air flow containing straw powder enters from this feed inlet. Under the guidance of the inner wall of the conical cylinder 401, a downward swirling flow is formed. Under the action of centrifugal force, the particles are thrown towards the cylinder wall. Once the particles contact the cylinder wall, they lose their inertial force and fall towards the discharge port under the action of gravity. The air flow is discharged from the exhaust pipe 402. However, this structure is suitable for particulate matter with a certain weight. For straw powder, due to its light texture, the falling distance relying on gravity is not long, and it is easy to be carried out from the exhaust pipe 402 by the swirling flow, and fewer particles go out from the lower discharge port.

[0052] As an improvement, as Figure 8 and Figure 9As shown in the figure, the cyclone separator includes a conical cylinder 401. The upper end of the conical cylinder 401 is provided with a tangential feed inlet 4011, the bottom is provided with a discharge outlet, and a discharge pipe 402 with one end inserted into the cylinder is installed at the center of the top. The feed inlet of the conical cylinder 401 is connected to the output port of the suction unit 3, the discharge outlet of the conical cylinder 401 is connected to the feed inlet of the rotary discharge valve 404, and the output port of the rotary discharge valve 404 is connected to the feed inlet of the second conveying unit 5. A guiding air duct 403 spirally downward along the inner wall is provided inside the conical cylinder 401. The upper end of the guiding air duct 403 communicates with the feed inlet of the conical cylinder 401, and the lower end extends to the side of the discharge outlet of the conical cylinder 401. Through the air duct guiding, the airflow with rice straw pulverized matter is sent to the bottom of the conical cylinder 401. Part of the rice straw pulverized matter loses inertia due to hitting the side wall of the air duct in the guiding air duct 403, and then slides out of the air duct along the guiding air duct 403 under the action of its own gravity and the driving of the subsequent air flow and enters the discharge outlet of the conical cylinder 401; part of the pulverized matter rushes out of the guiding air duct 403 under the action of the swirling flow, loses inertia after hitting the inner wall of the conical cylinder 401, and enters the feed channel of the rotary discharge valve 404 under the action of gravity. After the separated air flow rushes out of the guiding air duct 403, it hits the inner wall and rebounds upward and enters the discharge pipe 402. By setting the spirally downward guiding air duct 403, the rice straw pulverized matter is guided to the side of the discharge outlet of the conical cylinder 401, shortening the distance for the pulverized matter to fall by gravity, avoiding excessive rice straw pulverized matter from entering the exhaust duct, and improving the air separation effect.

[0053] Since the air flow discharged from the exhaust pipe still carries some rice straw pulverized matter, in order to avoid polluting the working environment, the air separation unit 4 of this embodiment includes a first recovery pipe 405 and several second recovery pipes 406. One end of the first recovery pipe 405 is connected to the end of the discharge pipe 402 exposed from the conical cylinder 401. A plurality of blanking holes arranged along the pipeline direction are provided on the side wall of the first recovery pipe 405. One end of the second recovery pipe 406 is connected to the blanking hole of the first recovery pipe 405. A bag filter 407 is connected to the end of the first recovery pipe 405 away from the discharge pipe 402 and the end of the second recovery pipe 406 away from the blanking hole. Through the bag filter 407 (a hemp bag or a cloth bag can be used as the filter bag for the rice straw pulverized matter), the rice straw pulverized matter in the air flow can be collected and the air can be filtered out, thus ensuring the cleanliness of the working environment. By setting multiple second recovery pipes 406 to connect multiple bag filters 407, part of the air flow can enter the second recovery pipe 406, and the pressure of the air flow discharged from the exhaust pipe can be weakened in segments, avoiding excessive air flow force and affecting the filtering effect of the bag filter 407.

[0054] The rotary discharge valve 404 includes a horizontally arranged cylindrical housing, a discharge rotating shaft, and a discharge driving part. The discharge rotating shaft is arranged along the axial direction of the housing, and one end extends out of the housing and is connected to the discharge driving part. The upper end of the housing is provided with a feed channel connected to the discharge port of the conical cylinder 401, and the lower end of the housing is provided with a discharge channel connected to the feed port of the second conveying unit 5; 4 discharge blades 4041 are evenly distributed on the discharge rotating shaft, and the end of the discharge blade 4041 far from the discharge rotating shaft is in clearance fit with the inner wall of the housing. The central angle of the inner wall of the housing between the feed port and the discharge port is greater than the included angle between two adjacent discharge blades 4041.

[0055] Due to the clearance fit between the discharge blade 4041 and the inner wall of the housing, effective blocking can be achieved, preventing the airflow from the upper conical cylinder 401 from entering the discharge channel of the rotary discharge valve 404. And the central angle of the inner wall of the housing between the feed port and the discharge port is greater than the included angle between two adjacent discharge blades 4041, ensuring that no matter how the discharge blade 4041 rotates, there will always be two opposite discharge blades 4041 blocking the airflow. As Figure 9 shown, in this embodiment, the central angle of the inner wall of the cylindrical housing between the feed channel and the discharge channel is 136°, and the included angle between two adjacent discharge blades 4041 is 90°, so as to ensure that the inner wall of the cylindrical housing between the feed channel and the discharge channel will always cooperate with the discharge blade 4041 to block the airflow.

[0056] The straw pulverized matter falling from the conical cylinder 401 accumulates between two adjacent upper discharge blades 4041. After the discharge blade 4041 rotates, the straw pulverized matter accumulated between two adjacent upper discharge blades 4041 is poured downward into the discharge channel of the rotary discharge valve 404.

[0057] As Figure 1 and Figure 10 shown, the second conveying unit 5 in this embodiment adopts a screw feeder, which is used to receive the straw pulverized matter separated from the air separation unit 4 and convey it to the pellet forming unit 6.

[0058] As Figures 10 to 12As shown in the figure, the granulation unit 6 includes a material pressing cavity, a material pressing rotating shaft 601, a fixed disk 602, a rotating disk 603, a material pressing roller 604 and a material pressing driving part 605. The fixed disk 602 is horizontally fixed in the material pressing cavity. The rotating disk 603 is located below the fixed disk 602, and the material pressing roller 604 is located above the fixed disk 602. The material pressing rotating shaft 601 is vertically arranged. One end of it passes through the rotating disk 603 and the fixed disk 602, is connected to the rotating disk 603 through a keyway, and is connected to the fixed disk 602 through a bearing. The other end is connected to the material pressing driving part 605 for transmission. A horizontally arranged roller connecting shaft 606 is fixed at one end of the material pressing rotating shaft 601 passing through the fixed disk 602. The material pressing roller 604 is rotatably connected to the roller connecting shaft 606. In this embodiment, there are two material pressing rollers 604 and they are symmetrically arranged. The fixed disk 602 is provided with a flared hole that is larger at the top and smaller at the bottom. On the disk surface of the movable disk facing the fixed disk 602, there are two breaking rib strips 6031 which are symmetrically arranged. The breaking rib strips 6031 are semi-cylindrical and are arranged along the radius direction of the movable disk. The material pressing cavity is provided with a particle outlet 607 between the fixed disk 602 and the movable disk, and a blanking groove 608 is arranged at the particle outlet 607 at the same time.

[0059] The second conveying unit 5 conveys the straw powder to the fixed disk 602. When the material pressing rotating shaft 601 rotates, it drives the material pressing roller 604 and the rotating disk 603 to rotate around the axis. During the rotation of the material pressing roller 604 around the axis, under the action of friction, it will rotate on its own. During the above rotation process, the material pressing roller 604 presses the straw powder into the flared hole. As the powder is continuously compacted and bonded, the compacted and bonded powder forms short columnar particles and extends out from below the flared opening 6021. During the rotation of the rotating disk 603, the breaking rib strips 6031 also rotate around the axis. When the short columnar particles extend downward by a certain length, they can be broken by the rotating breaking rib strips 6031 and pushed to the particle outlet 607 to realize the discharging of the straw fuel particles.

[0060] The processing technology of the straw and straw stalk crushing and granulation equipment includes the following steps:

[0061] S1. Workers put the recycled straw on the conveyor belt 102. Under the guidance of the outer guiding cover 101, the conveyor belt 102 sends the straw to the side of the cutting tool 202. The cutting tool 202 cuts the straw into small sections, and at the same time the cutting blade 2022 pushes the cut straw towards the crushing tool 203.

[0062] S2. The crushing tool 203 crushes the small sections of straw, and at the same time blows the straw crushed material to the output port of the crushing unit 2 through a blowing device.

[0063] S3. Through the sieve 205 and the suction unit 3, the straw crushed material that meets the specified size is sucked into the air separation unit 4.

[0064] S4. The wind and straw pulverized matter are separated by the wind and straw separation unit 4. The separated wind is discharged through the exhaust duct, and the separated straw pulverized matter is conveyed to the pellet forming unit 6;

[0065] S5. The pellet forming unit 6 compacts the straw pulverized matter into pellets and outputs them.

[0066] The above embodiments are only used to explain the concept of the present utility model, rather than limiting the protection scope of the rights of the present utility model. Any non-substantial modification made to the present utility model using this concept shall fall within the protection scope of the present utility model.

Claims

1. A straw crushing device, characterized in that, Comprising: A first conveying unit for feeding straw into the next process; A pulverizing unit for receiving the straw fed by the first conveying unit and pulverizing it, and a screen is provided at the output end of the pulverizing unit; A suction unit, the input port of the suction unit is connected to the output end of the pulverizing unit, and is used to suck out the pulverized straw that meets the specified particle size.

2. The straw crushing device according to claim 1, characterized in that, The pulverizing unit includes a pulverizing chamber, a pulverizing cutter is provided in the pulverizing chamber, the input port of the pulverizing chamber receives the output port of the first conveying unit, and the screen is installed at the output port of the pulverizing chamber.

3. The straw crushing device according to claim 2, characterized in that, A cutting tool is provided in the pulverizing chamber. The cutting tool includes a cutting tool rotating shaft and a plurality of cutting blades fixed on the circumference of the cutting tool rotating shaft. The cutting blades cut the straw into multiple segments and throw them towards the pulverizing tool side, and the pulverizing tool is used to pulverize the segmented straw.

4. A straw straw crushing device according to claim 2, characterized in that, There are multiple pulverizing tools, and the multiple pulverizing tools are arranged vertically. The output port of the pulverizing chamber is arranged below the lowermost pulverizing tool.

5. The straw and stalk crushing device according to claim 2, wherein The pulverizing tool includes a pulverizing tool rotating shaft, a plurality of fixed shafts, a plurality of fixed pulverizing blades and a plurality of movable pulverizing blades. The fixed pulverizing blade includes a polygonal substrate, a rotating shaft mounting hole opened in the middle of the substrate, a plurality of fixed shaft mounting holes one opened on the substrate and located in the circumference of the rotating shaft mounting hole, and cutting edges located on each side of the substrate; The movable pulverizing blade is strip-shaped, including a fixed shaft mounting hole two provided at one end and a cutting edge provided at the edge of the movable pulverizing blade; A plurality of the fixed pulverizing blades are arranged parallel to the axial direction of the pulverizing tool rotating shaft and fixed to the pulverizing tool rotating shaft. The fixed shaft mounting holes one on two adjacent fixed pulverizing blades correspond to each other. The fixed shaft passes through the corresponding plurality of fixed shaft mounting holes one and is fixedly connected to the fixed pulverizing blade. An annular groove is opened on the mounting shaft between two adjacent fixed pulverizing blades, and the movable pulverizing blade is movably connected to the annular groove of the fixed shaft through the fixed shaft mounting hole two at the end.

6. The straw and stalk crushing device according to claim 5, wherein, The cutting edges on each side of the substrate include straight edges and / or serrated edges.

7. A straw straw crushing device according to claim 5, characterized in that, The cutting edges on the movable pulverizing blade include straight edges and / or serrated edges.

8. The straw crushing device according to claim 5, characterized in that, A reinforcing plate is arranged between two adjacent fixed pulverizing blades. The two ends of the reinforcing plate are fixed to the fixed pulverizing blades on both sides, and the bottom is fixed to the pulverizing tool rotating shaft.

9. The straw crushing device according to claim 2, characterized in that, Comprising a blowing unit, an air inlet is opened on the top surface of the pulverizing chamber, and the air inlet is located directly above the pulverizing tool. The suction port of the blowing unit is used to suck in external air, and the air outlet of the blowing unit is connected to the air inlet on the top surface of the pulverizing chamber, and is used to blow the pulverized straw on the pulverizing tool towards the screen.

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