Wind-material separator for crushed straw stalks

Abstract

The utility model relates to the field of rice straw processing equipment, in particular to a wind-material separator for crushed rice straw, which comprises a conical barrel and a rotary discharge valve, a tangential feed port is arranged at the upper end of the conical barrel, a discharge port is arranged at the bottom of the conical barrel, and an exhaust pipe with one end inserted into the barrel is mounted in the center of the top of the conical barrel. A feeding port of the conical barrel is connected with an output port of the suction unit, a discharging port of the conical barrel is connected with a feeding port of the rotary discharging valve, and an output port of the rotary discharging valve is connected with a feeding port of the second conveying unit. A guide air duct spirally downward along the inner wall is arranged in the conical barrel, the upper end of the guide air duct is communicated with a feed port of the conical barrel, and the lower end of the guide air duct extends to the discharge port side of the conical barrel; the wind-object separator has the advantages that the wind-object separator suitable for crushed straw is developed, wind-object separation is effectively carried out, the automation degree is high, dust pollution to the working environment is little, and the wind-object separator is efficient and safe.

Description

Technical Field

[0001] The utility model relates to the field of rice straw treatment equipment, in particular to an air separator for rice straw pulverized matter. Background Technique

[0002] Straw is the general term for the stem and leaf parts of mature crops, usually referring to the remaining parts after harvesting the seeds 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 generated in each season, resulting in the difficulties of high labor costs and low efficiency in the harvesting and treatment of rice straw.

[0003] When using straw as fuel, the existing treatment methods mostly adopt the direct combustion method. However, when burning directly, the 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 straw as fuel, there are defects such as low calorific value and a lot of ash.

[0004] In order to realize the automatic, low-cost production and high-enthusiasm recycling of straw and improve the income of farmers from straw recycling, this case is hereby proposed. The applicant has developed a rice straw pulverizing and granulating equipment, which realizes the pneumatic conveying of rice straw pulverized matter through the methods of air supply and suction. However, a cyclone separator is usually required at the end of the pneumatic conveying to separate the air flow and the rice straw pulverized matter. The existing cyclone separator, as shown in Patent 201922063312.8, has a tangential feed inlet provided at the upper section of the conical cylinder body, and at the same time, an exhaust pipe inserted into the cylinder to a certain depth is installed at the center of the top, and a discharge outlet is provided at the bottom of the cylinder. The air flow containing rice straw powder enters from this feed inlet and forms a downward swirling flow under the guidance of the inner wall of the conical cylinder. 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 outlet under the action of gravity, and the air flow is discharged from the exhaust pipe. However, this structure is suitable for particulate matter with a certain weight. For rice straw powder, due to its light texture, the distance of falling by gravity is not long, and it is easy to be carried out by the swirling flow and go out from the exhaust pipe, and fewer powder particles go out from the lower discharge outlet.

[0005] Based on this, this case is hereby proposed. Content of the Utility Model

[0006] The purpose of the utility model is to provide an air separator for rice straw pulverized matter to realize the effective separation of the rice straw pulverized matter and the air flow.

[0007] To achieve the above purpose, the technical solution of the utility model is as follows:

[0008] An air separator for straw straw pulverized matter, comprising a conical cylinder and a rotary discharge valve. The upper end of the conical cylinder is provided with a tangential feed inlet, the bottom is provided with a discharge outlet, and a exhaust pipe with one end inserted into the cylinder is installed at the center of the top. The feed inlet of the conical cylinder is connected to the output port of the suction unit, the discharge outlet of the conical cylinder is connected to the feed inlet of the rotary discharge valve, and the output port of the rotary discharge valve is connected to the feed inlet of the second conveying unit; A guiding air duct spiraling downward along the inner wall is arranged inside the conical cylinder. The upper end of the guiding air duct communicates with the feed inlet of the conical cylinder, and the lower end extends to the side of the discharge outlet of the conical cylinder.

[0009] Further, it includes a first recovery pipe. One end of the first recovery pipe is connected to the end of the exhaust pipe exposed from the conical cylinder, and the other end is connected with a bag type filter.

[0010] Further, it includes a second recovery pipe. A plurality of blanking holes arranged along the pipeline direction are provided on the side wall of the first recovery pipe. One end of the second recovery pipe is connected to the blanking hole of the first recovery pipe, and the other end far away from the blanking hole of the second recovery pipe is connected with a bag type filter.

[0011] Further, the rotary discharge valve includes a horizontally arranged cylindrical shell, a discharge rotating shaft and a discharge driving part. The discharge rotating shaft is arranged along the axial direction of the shell and one end extends out of the shell and is connected with the discharge driving part. The upper end of the shell is provided with a feed channel connected to the discharge outlet of the conical cylinder, and the lower end of the shell is provided with a discharge channel connected to the feed inlet of the second conveying unit;

[0012] At least 3 discharge blades are evenly distributed on the discharge rotating shaft. The end of the discharge blade far away from the discharge rotating shaft is in clearance fit with the inner wall of the shell. The central angle of the inner wall of the shell between the feed inlet and the discharge outlet is greater than the included angle between adjacent two discharge blades.

[0013] The advantages of the utility model are as follows: developing an air separator applicable to straw pulverized matter, effectively carrying out air separation, and having the advantages of high automation degree, less dust pollution in the working environment, high efficiency and safety. Description of the Drawings

[0014] Figure 1 It is a three-dimensional structure schematic diagram of the straw straw pulverizing and granulating equipment in the embodiment;

[0015] Figure 2 It is a three-dimensional structure schematic diagram of the straw straw pulverizing equipment in the embodiment;

[0016] Figure 3 For Figure 2 A schematic diagram of the structure from another perspective;

[0017] Figure 4 ForFigure 3 Internal structural schematic diagram;

[0018] Figure 5 Structural schematic diagram of the crushing tool and cutting tool in the embodiment;

[0019] Figure 6 Structural schematic diagram of the crushing tool in the embodiment;

[0020] Figure 7 Explosion schematic diagram of the fixed crushing blade and movable crushing blade in the crushing tool of the embodiment;

[0021] Figure 8 Structural schematic diagram of the air and material separation unit in the embodiment;

[0022] Figure 9 Cross-sectional schematic diagram of the air and material separation unit in the embodiment;

[0023] Figure 10 Structural schematic diagram of the particle forming unit in the embodiment;

[0024] Figure 11 Internal structural schematic diagram of the particle forming unit in the embodiment;

[0025] Figure 12 Cross-sectional schematic diagram of the particle forming unit in the embodiment;

[0026] Label description

[0027] 1. First conveying unit; 101. Guide cover; 102. Conveyor belt; 103. Tension adjustment mechanism; 104. Protection plate;

[0028] 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;

[0029] 3. Suction unit;

[0030] 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;

[0031] 5. Second conveying unit;

[0032] 6. Granule 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. Granule outlet; 608. Feeding chute. Detailed implementation mode

[0033] The following further describes the present utility model in detail in conjunction with embodiments. It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. in the text is based on the orientation or positional relationship shown in the drawings, and is 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.

[0034] This embodiment proposes a rice straw crushing and granule forming device, as Figure 1 shown, including a first conveying unit 1, a crushing unit 2, a suction unit 3, a wind and material separation unit 4, a second conveying unit 5 and a granule forming unit 6.

[0035] 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 conveys 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 for effective crushing treatment. Preferably, a tension adjusting mechanism 103 is provided at the conveyor belt 102 so that the tension of the conveyor belt 102 can be adjusted at any time. As Figure 2 shown, the motors for driving the crushing unit 2 and the first conveying unit 1 in this embodiment 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.

[0036] As Figure 4 shown, the crushing unit 2 includes a crushing chamber 201. A cutting tool 202 and two crushing tools 203 are provided in the crushing chamber 201. 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 arranged below the lowermost crushing tool 203, and a screen 205 is installed at the output port. As Figure 5As 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 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 straw into fine powder.

[0037] As Figure 6 and Figure 7 shown, the crushing tool 203 includes a crushing tool rotating shaft 2031, four fixed shafts 2032, 5 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 fixed shaft mounting holes one 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 fixed shaft mounting hole two 20331 provided at one end and a cutting edge 20332 provided on the edge of the movable crushing blade; the 5 fixed crushing blades 2034 are arranged in parallel along the axial direction of the crushing tool rotating shaft 2031 and fixed to the crushing tool rotating shaft 2031. The fixed shaft mounting holes one 20342 on adjacent two fixed crushing blades 2034 correspond to each other. The four fixed shafts 2032 pass through the corresponding four fixed shaft mounting holes one 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 fixed shaft mounting hole two 20331 at the end. Three movable crushing blades 2033 are arranged between two 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.

[0038] 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 blades are smooth, continuous, and without serrations, forming a continuous sharp edge as a whole, which is suitable for cutting the softer or medium-hard parts of the straw texture; the serrated edges on the blades 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 crushing blade 2033 is movably arranged. When the crushing tool 203 rotates on its axis, the movable crushing blade 2033 will radially disperse under the action of centrifugal force, making the cutting range of the crushing tool 203 larger. At the same time, when encountering hard objects, it can play a certain buffering role to avoid breaking the movable crushing blade 2033. 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.

[0039] 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 opened on the top surface of the crushing chamber 201, and the air inlet is located 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.

[0040] As Figure 6 shown, preferably, this embodiment also sets 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.

[0041] The suction unit 3 uses a turbo blower, 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.

[0042] The wind and straw separation unit 4 adopts a cyclone separator and a rotary discharge valve 404, which are used to receive the wind and straw pulverized matter output from the suction unit 3 and separate the wind and straw pulverized matter. As shown in the existing cyclone separator in Patent 201922063312.8, a tangential feed inlet 4011 is provided in the upper section of the conical cylinder 401 body, and an exhaust pipe 402 inserted into the cylinder to a certain depth is installed at the center of the top. An outlet is provided at the bottom of the cylinder. The air flow containing straw powder enters from this feed inlet and forms a downward swirl under the guidance of the inner wall of the conical cylinder 401. 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 outlet under the action of gravity, and 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 distance of falling by gravity is not long, and it is easy to be carried out by the swirl from the exhaust pipe 402, and fewer particles go out from the lower outlet.

[0043] As an improvement, as Figure 8 and Figure 9 shown, 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 an outlet, and an exhaust 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 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 outlet of the conical cylinder 401. Through the guiding of the air duct, the air flow with straw pulverized matter is sent to the bottom of the conical cylinder 401. Some of the straw pulverized matter loses its inertial force 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 and enters the outlet of the conical cylinder 401 under the drive of its own gravity and the subsequent air flow; some of the pulverized matter rushes out of the guiding air duct 403 under the drive of the swirl, loses its inertial force 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 exhaust pipe 402. By setting the spirally downward guiding air duct 403, the straw pulverized matter is guided to the side of the outlet of the conical cylinder 401, shortening the distance of the pulverized matter falling by gravity, avoiding too much straw pulverized matter from entering the exhaust duct, and improving the effect of wind and straw separation.

[0044] Since some straw pulverized materials will still be carried in the air flow exiting the exhaust duct, 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 exhaust pipe 402 that exposes outside the conical cylinder 401. There are several material discharge holes arranged along the pipeline direction on the side wall of the first recovery pipe 405. One end of the second recovery pipe 406 is connected to the material discharge 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 exhaust pipe 402 and the end of the second recovery pipe 406 away from the material discharge hole. Through the bag filter 407 (a burlap bag or a cloth bag can be used as the filter bag for straw pulverized materials), the straw pulverized materials in the air flow can be collected and the air can be filtered out, thus ensuring the cleanliness of the working environment. And by setting multiple second recovery pipes 406 to connect multiple bag filters 407, part of the air flow can enter the second recovery pipes 406, which can weaken the pressure of the air flow discharged from the exhaust duct in sections and avoid the excessive air flow force affecting the filtering effect of the bag filter 407.

[0045] The rotary discharge valve 404 includes a horizontally arranged cylindrical shell, a discharge rotating shaft and a discharge driving part. The discharge rotating shaft is arranged along the axial direction of the shell and one end extends out of the shell and is connected to the discharge driving part. The upper end of the shell is provided with a feed channel connected to the discharge port of the conical cylinder 401, and the lower end of the shell 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. The end of the discharge blade 4041 away from the discharge rotating shaft is in clearance fit with the inner wall of the shell. The central angle of the inner wall of the shell between the feed port and the discharge port is greater than the included angle between two adjacent discharge blades 4041.

[0046] Since there is a clearance fit between the discharge blade 4041 and the inner wall of the shell, it can effectively block and prevent the air flow rushing out 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 shell between the feed port and the discharge port is greater than the included angle between two adjacent discharge blades 4041, which ensures that no matter how the discharge blade 4041 rotates, there will be two opposite discharge blades 4041 blocking the air flow. As Figure 9 shown, in this embodiment, the central angle of the inner wall of the cylindrical shell 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 shell between the feed channel and the discharge channel will always cooperate with the discharge blade 4041 to block the air flow.

[0047] The straw pulverized matter falling from the conical cylinder 401 accumulates between two adjacent upper discharge blades 4041. After the discharge blades 4041 rotate, the straw pulverized matter accumulated between two adjacent upper discharge blades 4041 is dumped downward into the discharge channel of the rotary discharge valve 404.

[0048] 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 wind separation unit 4 and convey it to the granulation unit 6.

[0049] As Figures 10 to 12 shown, the granulation unit 6 includes a pressure chamber, a pressure rotating shaft 601, a fixed disk 602, a rotating disk 603, a pressure roller 604 and a pressure driving part 605. The fixed disk 602 is horizontally fixed in the pressure chamber. The rotating disk 603 is located below the fixed disk 602, and the pressure roller 604 is located above the fixed disk 602. The pressure rotating shaft 601 is arranged vertically. One end of it passes through the rotating disk 603 and the fixed disk 602, and is connected to the rotating disk 603 through a key groove and to the fixed disk 602 through a bearing. The other end is connected to the pressure driving part 605 for transmission. A horizontally arranged pressure roller coupling shaft 606 is fixed at one end of the pressure rotating shaft 601 passing through the fixed disk 602, and the pressure roller 604 is rotatably connected to the pressure roller coupling shaft 606. In this embodiment, there are two pressure rollers 604 and they are symmetrically arranged. The fixed disk 602 is provided with a trumpet-shaped 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 that are symmetrically arranged. The breaking rib strips 6031 are semi-cylindrical and are arranged along the radius direction of the movable disk. The pressure chamber is provided with a particle outlet 607 between the fixed disk 602 and the movable disk, and a feeding chute 608 is arranged at the particle outlet 607.

[0050] The second conveying unit 5 conveys the straw powder to the fixed disk 602. When the pressure rotating shaft 601 rotates, it drives the pressure roller 604 and the rotating disk 603 to rotate around the axis. During the rotation of the pressure roller 604 around the axis, under the action of friction, it will rotate self - axially. During the above rotation process, the pressure roller 604 presses the straw powder into the trumpet-shaped hole. As the powder is continuously compacted and bonded, the compacted and bonded powder forms short columnar particles that extend out from below the trumpet 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.

[0051] The processing technology of this straw and straw stalk pulverizing and granulating equipment includes the following steps:

[0052] S1. Workers put the recycled straw onto conveyor belt 102. Under the guidance of the outer guide cover 101, conveyor belt 102 sends the straw towards the side of cutting tool 202. Cutting tool 202 cuts the straw into small segments. At the same time, cutting blade 2022 pushes the cut straw towards crushing tool 203;

[0053] S2. Crushing tool 203 crushes the small segments of straw. At the same time, the straw crushed material is blown to the output port of crushing unit 2 through the blowing device;

[0054] S3. Through sieve 205 and suction unit 3, the straw crushed material that meets the specified size is suctioned into air separation unit 4;

[0055] S4. Air separation unit 4 separates the air and the straw crushed material. The separated air is discharged through the exhaust duct, and the separated straw crushed material is transported to pellet forming unit 6;

[0056] S5. Pellet forming unit 6 compacts the straw crushed material into pellets and outputs them.

[0057] 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 changes made to the present utility model using this concept shall fall within the protection scope of the present utility model.

Claims

1. An air separator for straw straw pulverized material, comprising a conical cylinder and a rotary discharge valve. The upper end of the conical cylinder is provided with a tangential feed inlet, the bottom is provided with a discharge outlet, and a exhaust pipe with one end inserted into the cylinder is installed at the center of the top. The feed inlet of the conical cylinder is connected to the output port of the suction unit, the discharge outlet of the conical cylinder is connected to the feed inlet of the rotary discharge valve, and the output port of the rotary discharge valve is connected to the feed inlet of the second conveying unit; characterized in that: A guiding air duct spirally downward along the inner wall is arranged inside the conical cylinder. The upper end of the guiding air duct communicates with the feed inlet of the conical cylinder, and the lower end extends to the side of the discharge outlet of the conical cylinder.

2. The air separator for the crushed straw as described in claim 1, characterized in that, It includes a first recovery pipe. One end of the first recovery pipe is connected to the end of the exhaust pipe exposed outside the conical cylinder, and the other end is connected with a bag filter.

3. A wind separator for straw straw pulverized matter according to claim 2, characterized in that, It includes a second recovery pipe. A plurality of blanking holes are arranged on the side wall of the first recovery pipe along the pipeline direction. One end of the second recovery pipe is connected to the blanking hole of the first recovery pipe, and the end of the second recovery pipe far from the blanking hole is connected with a bag filter.

4. A wind separator for crushed straw stalks according to claim 1, characterized in that, The rotary discharge valve includes a horizontally arranged cylindrical shell, a discharge rotating shaft and a discharge driving part. The discharge rotating shaft is arranged along the axial direction of the shell and one end extends out of the shell and is connected to the discharge driving part. The upper end of the shell is provided with a feed channel connected to the discharge outlet of the conical cylinder, and the lower end of the shell is provided with a discharge channel connected to the feed inlet of the second conveying unit; At least 3 discharge blades are evenly distributed on the discharge rotating shaft. The end of the discharge blade far from the discharge rotating shaft is in clearance fit with the inner wall of the shell. The central angle of the inner wall of the shell between the feed inlet and the discharge outlet is greater than the included angle between two adjacent discharge blades.

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