Powder preparation equipment for crushing and screening biomass

Abstract

The invention relates to the technical field of biomass energy comprehensive application, and discloses a pulverizing device for biomass crushing and screening, which comprises a first shell, a blanking pipe, a driving mechanism, a cutterhead assembly and a conveying assembly, the blanking pipe extends into the first shell along an opening in the top end of the first shell, the driving mechanism is installed on the first shell, and the output end of the driving mechanism is arranged on the periphery of the blanking pipe in a sleeving mode; the cutterhead assembly comprises a cutterhead shaft, an angle adjusting mechanism and a plurality of blades; the cutter shaft is arranged in the first shell and arranged on the periphery of the output end of the driving mechanism in a sleeving mode, and a sealing interlayer is formed between the cutter shaft and the output end of the driving mechanism. The plurality of blades are arranged on the cutter head shaft, and the angle adjusting mechanism is arranged in the sealing interlayer and is correspondingly connected with the blades; the conveying assembly provides driving force for the angle adjusting mechanism. The angle of the blades and the cutting gap between the adjacent blades can be adjusted in real time through the angle adjusting mechanism, and real-time dynamic control over the ventilation resistance and the material powder fineness in the first shell is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive application of biomass energy, in particular to a pulverizing device for biomass crushing and screening. Background Art

[0002] Against the backdrop of dwindling fossil energy resources, the use of renewable energy has become a hot topic in the 21st century. Biomass, with its abundant global reserves and short-term renewable nature, has drawn considerable attention. Whether used in power generation or the chemical industry, the application of biomass ultimately hinges on issues related to biomass crushing and grinding.

[0003] However, the existing biomass crushing equipment cannot dynamically adjust the powder fineness in real time and cannot meet the demand for industrial-scale fine powder and ultrafine powder. Summary of the Invention

[0004] The purpose of the present invention is to provide a biomass crushing and screening milling equipment to solve the problem in the above background technology that the existing biomass milling equipment cannot dynamically adjust the powder fineness in real time and cannot meet the industrial scale level of fine powder and ultrafine powder.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pulverizing device for biomass crushing and screening, comprising:

[0007] A first shell, wherein the axis of the first shell extends along a first direction, a discharge port is provided on one side of the first shell, the interior of the first shell is hollow and has a top opening and a bottom opening, and the bottom opening is used to connect to a blowing, carrying and slag discharging device;

[0008] a drop tube extending along the top opening into the first housing, wherein the axis of the drop tube is collinear with the axis of the first housing;

[0009] A drive mechanism, wherein the drive mechanism is mounted on the first housing, an output end of the drive mechanism extends into the first housing along the top opening, the output end of the drive mechanism is rotatably sleeved around the outer circumference of the blanking tube about its own axis, and the output end of the drive mechanism is rotatably sealed to the top opening, and the axis of the output end of the drive mechanism is collinear with the axis of the first housing;

[0010] A cutter disc assembly; the cutter disc assembly is arranged in the first housing and is located below the discharge port, and the cutter disc assembly includes a cutter disc shaft, an angle adjustment mechanism and a plurality of blades; the cutter disc shaft is arranged in the first housing and is sleeved on the outer periphery of the output end of the drive mechanism, so that the output end of the drive mechanism drives the cutter disc shaft to rotate around its own axis, and a sealed interlayer is formed between the cutter disc shaft and the output end of the drive mechanism; one end of the plurality of blades is rotatably arranged on the outer peripheral wall of the cutter disc shaft around its own axis, and the other ends of the plurality of blades extend in a direction away from the cutter disc shaft, and the angle adjustment mechanism is arranged in the sealed interlayer and is correspondingly connected to the blades to control the rotation of the blades around their own axis;

[0011] A conveyor assembly is positioned above the cutter shaft and is connected to the angle adjustment mechanism, providing driving force for the mechanism. This arrangement allows the blades to rotate about their axes, adjusting the blade angles and the cutting gaps between adjacent blades. This achieves real-time dynamic control of the powder fineness and ventilation resistance within the first housing.

[0012] Furthermore, each blade has a rotating shaft at one end, the axis of the rotating shaft and the axis of the blade being colinear and extending in a second direction, and each of the blades is connected to the angle adjustment mechanism via its own rotating shaft, wherein the second direction is perpendicular to the first direction. By configuring this angle adjustment mechanism, the blade angle can be adjusted by rotating the rotating shaft.

[0013] Furthermore, the angle adjustment mechanism includes an adjustment assembly; the adjustment assembly includes a driver, a pressure rod, a plurality of connecting rod assemblies, and a plurality of transmission rods; the pressure rod is arranged on the inner wall of the cutter disc shaft along the circumference of the cutter disc shaft, the output end of the driver is connected to the pressure rod to drive the pressure rod to rise and fall along the first direction, the first ends of the plurality of connecting rod assemblies are hinged to the pressure rod, the second ends of the plurality of connecting rod assemblies are connected one-to-one with the rotary axes of the blades located on the same circumferential surface of the cutter disc shaft, the plurality of transmission rods extend along the first direction, and the plurality of transmission rods are used to connect one side of the rotary axes that are collinear along the first direction so that the blades that are collinear along the first direction rotate synchronously. When the cutter disc shaft is small in size and the driving force of the oil cylinder is strong, a set of adjustment assemblies can be provided to drive all the blades on the cutter disc shaft to rotate synchronously.

[0014] Furthermore, the angle adjustment mechanism includes multiple adjustment assemblies, each of which includes a driver, a pressure rod, multiple connecting rod assemblies, and multiple transmission rods; the pressure rods in each adjustment assembly are distributed along the same circumferential surface of the cutter disc shaft, the output end of the driver is connected to the pressure rod to drive the pressure rod to rise and fall in a first direction, the first ends of the multiple connecting rod assemblies are hinged to the pressure rod, the second ends of the multiple connecting rod assemblies are correspondingly connected to the rotary shaft located on the same circumferential surface of the cutter disc shaft, the multiple transmission rods extend along the first direction, and the multiple transmission rods are used to connect one side of the rotary shaft that is collinear along the first direction so that the blades that are collinear along the first direction rotate synchronously. When the cutter disc shaft is large in size and the power of a single oil cylinder obviously cannot meet the requirements, multiple sets of adjustment assemblies can be provided.

[0015] Furthermore, the angle adjustment structure includes an adjustment assembly; the adjustment assembly includes a pressure rod, multiple drivers, multiple connecting rod assemblies, and multiple transmission rods; the pressure rod is arranged on the inner wall of the cutter disc shaft along the circumference of the cutter disc shaft, the output ends of multiple drivers are connected to the pressure rod to synchronously drive the pressure rod to rise and fall along the first direction, the first ends of multiple connecting rod assemblies are hinged to the pressure rod, the second ends of multiple connecting rod assemblies are connected one-to-one with the rotary axes of the blades located on the same circumferential surface on the cutter disc shaft, the multiple transmission rods extend along the first direction, and the multiple transmission rods are used to connect one side of the rotary axes that are collinear along the first direction, so that the blades that are collinear along the first direction rotate synchronously. Through this arrangement, the number of pressure rods can be simplified, and the synchronous rotation of all blades on the cutter disc shaft can also be achieved.

[0016] Furthermore, the connecting rod assembly includes a first connecting rod and a second connecting rod; the first end of the first connecting rod is hinged to the pressure rod, the first end of the second connecting rod is hinged to the second end of the first connecting rod, and the second end of the second connecting rod is fixedly connected to the corresponding rotating shaft. With this arrangement, the connecting rod assembly is formed by the hinged connection of the first and second connecting rods, and has a simple and reasonable structure. The blade angle can be adjusted in conjunction with the pressure rod and the rotating shaft.

[0017] Furthermore, the actuator is a hydraulic cylinder. Among the hydraulic cylinders in all adjustment assemblies, the oil inlet of one cylinder is connected to the delivery assembly, and the oil outlet of this cylinder is connected to the oil inlet of the next cylinder. The remaining cylinders are connected in series until the oil outlet of the last cylinder is connected to the delivery assembly. Using hydraulic cylinders as actuators provides stable output power. The series connection of the cylinders ensures that the oil flow rate of each cylinder is the same, thus ensuring that the displacement of the output shaft of each cylinder is the same, ensuring consistent blade angle adjustment. This ensures that all blades within the first housing rotate synchronously with the cylinder movement, meeting the dynamic balancing requirements of the blades within the first housing as they rotate at high speed with the cutterhead shaft.

[0018] Furthermore, the conveying assembly includes a support plate, an oil circuit slewing ring, and an oil circuit conveying ring; the oil circuit slewing ring is fixed in the first housing via the support plate, and the oil circuit slewing ring is located above the cutterhead shaft, an oil transmission channel is provided in one of the support plates for connecting the oil circuit channel in the oil circuit slewing ring with an external oil supply system, the oil circuit conveying ring is fixed to the upper end surface of the cutterhead shaft, the oil circuit slewing ring and the oil circuit conveying ring are rotatably sealed and connected to each other, the oil circuit conveying ring is used to connect the oil inlet of one of the oil cylinders and the oil outlet of the last oil cylinder with the oil circuit channel in the oil circuit slewing ring; the central through holes of the oil circuit slewing ring and the oil circuit conveying ring are used for passing a driving member that drives the cutterhead shaft to rotate around its own axis. Through this arrangement, there is no oil circuit entanglement or knotting during the rotation of the cutterhead shaft, thereby improving the working stability of the cutterhead shaft.

[0019] Furthermore, the oil delivery channel within the support plate includes an oil inlet pipe and an oil return pipe; an annular oil inlet channel and an annular oil return channel are provided within the oil circuit slewing ring, the oil inlet pipe being connected to the oil inlet channel, and the oil return pipe being connected to the oil return channel; an oil inlet pipe and an oil return pipe are provided on the oil circuit delivery ring, vertically distributed, the oil inlet pipe connecting the oil inlet channel to the oil inlet of one of the oil cylinders, and the oil return pipe connecting the oil outlet of the last oil cylinder to the oil return channel. This arrangement rationally configures the oil circuit delivery pipelines and effectively prevents entanglement and kinking of the oil circuit.

[0020] Furthermore, the air blowing, carrying and slag removal device includes a second shell and a material-dividing and blowing mechanism for evenly dividing the falling material and changing the air flow rate and direction; the second shell is connected to the bottom opening of the first shell, and the inner cavity of the second shell is connected to the inner cavity of the first shell; the material-dividing and blowing mechanism is arranged on the inner wall of the second shell; an air inlet is provided on one side of the second shell, and the air inlet is located below the material-dividing and blowing mechanism, and a slag discharge port is provided on the other side of the second shell. The air flow enters the second shell through the air inlet, and after the flow rate and direction are changed by the material-dividing and blowing mechanism, the material discharged from the drop pipe is blown to the cutter disc assembly area for crushing and screening. The material with qualified fineness is discharged through the discharge port, and the material that is difficult to crush is discharged through the slag discharge port.

[0021] Furthermore, the material dividing and blowing mechanism includes dividing blocks arranged in sequence along the blanking direction for evenly dividing the falling materials and a blowing ring for changing the air flow rate and direction, the dividing blocks are conical, and the blowing ring has a top surface, a bottom surface and a conical surface connecting the top surface and the bottom surface; the top surface area of the blowing ring is smaller than the bottom surface area of the blowing ring, the dividing block is located on the top surface of the blowing ring, the axis of the dividing block and the axis of the blowing ring are both collinear with the axis of the blanking pipe and the bottom surface area of the dividing block is larger than the top surface area of the blowing ring; the conical surface of the blowing ring is provided with a plurality of air guide holes extending from the conical surface to its bottom surface, and the plurality of air guide holes are all curved and evenly distributed along the conical surface of the blowing ring. The distributor block is conical in shape, its axis collinear with the axis of the drop tube. The base diameter of the distributor block is larger than the diameter of the drop tube outlet. Material falling through the drop tube is evenly distributed along the distributor block's conical surface. The blowing ring features a tapered surface with a smaller diameter at the top and a larger diameter at the bottom. This arrangement allows the material, evenly distributed by the distributor block, to slide freely along the blowing ring's conical surface. The air guide holes are curved, allowing the air passing through them to lift the material in an inclined direction. This, in conjunction with the blades on the cutterhead shaft, achieves optimal crushing and screening.

[0022] Furthermore, the ratio of the bottom area of the dividing block to the top area of the blowing ring is 1:0.95 to 1:0.8. Through this setting, the bottom area of the dividing block can be slightly larger than the top area of the blowing ring, ensuring that the material can slide through the conical surface of the dividing block to the conical surface of the blowing ring, avoiding the accumulation of material at the junction of the dividing block and the blowing ring. The ratio of the top area of the blowing ring to the bottom area of the blowing ring is 1:5 to 1:20. The specific ratio needs to be designed according to the size of the material's angle of repose, so that the material can slide freely on the blowing ring.

[0023] Furthermore, the width of the air guide hole gradually increases from the center to the circumference of the blowing ring. This arrangement is combined with the curved structure of the air guide hole itself, so that the wind passing through the air guide hole can blow the material in an inclined direction.

[0024] Furthermore, the width of the air guide hole increases gradually from the top surface to the bottom surface of the blowing ring. This arrangement can prevent materials from getting stuck in the air guide hole during the falling process.

[0025] Furthermore, it also includes a material discharge air guide mechanism, which includes a slag discharge plate and an air guide platform; the slag discharge plate is tiltedly arranged in the second shell, one side of the slag discharge plate is located below the air inlet, and the other side of the slag discharge plate is located below the slag discharge port, and the side of the slag discharge plate close to the air inlet is higher than the side close to the slag discharge port, the air guide platform is fixed to the slag discharge plate, the axis of the air guide platform is collinear with the blowing ring, and the top surface of the air guide platform is close to or contacts the bottom surface of the blowing ring.

[0026] Furthermore, the air guide platform is in a frustum shape. By providing the air guide platform, the wind from the air inlet is dispersed as evenly as possible on the bottom surface of the blowing ring under the guiding effect of the air guide platform, so that the air volume and wind speed passing through each air guide hole are basically consistent.

[0027] Furthermore, it also includes a return material coarse crushing device, the first end of which is connected to the slag discharge port, and the second end of which is connected to the drop pipe, for circulating and crushing large particles of material.

[0028] Furthermore, the driving mechanism includes a driving motor, a transmission assembly and a driving shaft; the driving shaft is located in the first shell and can be rotatably mounted on the outer periphery of the blanking tube around its own axis. The driving motor is arranged on the first shell, and the output shaft of the driving motor is connected to the driving shaft through the transmission assembly to drive the driving shaft to rotate around its own axis.

[0029] Furthermore, the air-blowing material-carrying and slag-discharging device is a mill primary crushing system, and the high-speed airflow of the mill primary crushing system carries the material into the first shell, and the difficult-to-crush material is discharged through the mill slag-discharging system.

[0030] Furthermore, the first housing comprises a connected upper housing and a lower housing; the discharge port is located in the upper housing, and the cutter assembly is disposed within the lower housing. The inner wall of the lower housing has a turbulent layer to create turbulent flow when the material approaches the inner wall of the lower housing. This arrangement further disturbs the material rising with the airflow, preventing it from adhering to the inner wall of the lower housing, thereby improving the material crushing effect.

[0031] Furthermore, the turbulent layer protrudes from the inner wall surface of the first shell, and the turbulent layer is a convex block with a spiral distribution; or is composed of a plurality of annular convex blocks arranged in sequence.

[0032] The present invention has the following advantages over the prior art:

[0033] 1. The pulverizing equipment for biomass crushing and screening in the present invention includes a first shell, a drop pipe, a drive mechanism, a cutter disc assembly and a conveying component, wherein the drop pipe, the output end of the drive mechanism and the cutter disc shaft in the cutter disc assembly are mutually connected and are all coaxial with the first shell. This design makes the entire pulverizing equipment compact and effectively reduces the floor space. The cutter disc assembly includes a cutter disc shaft, an angle adjustment mechanism and a plurality of blades; wherein the blades are mounted on the cutter disc shaft, and the cutter disc shaft is driven to rotate by the output end of the drive mechanism so that the blades can crush the material under the action of cutting and impact; at the same time, under the action of the angle adjustment mechanism, the blades can rotate around their own axes, thereby adjusting the angle of the blades and the cutting gap between adjacent blades. Under the action of the high-speed rotation of the blades, the rotation of the blades will provide a certain lift or resistance to the material rising with the airflow, which may cause the material to easily pass through the blade gap or not easily pass through the blade gap, thereby playing the role of screening and adjusting the fineness of the material. From another perspective, as the blades rotate, the changing cutting gaps between adjacent blades on the same circumference intercept larger particles for further cutting and crushing, while allowing materials meeting the required fineness to pass through the cutting gaps and be discharged through the outlet, thus acting as a screening mechanism. Furthermore, if ventilation resistance is excessive or insufficient, the blade angle can be adjusted to provide a certain amount of lift or resistance, enabling real-time dynamic control of the powder fineness and ventilation resistance within the first housing. This ensures stable operation of the entire grinding system while meeting the fineness requirements of varying operating conditions.

[0034] 2. The angle adjustment mechanism of the present invention can be provided with one or more adjustment components according to actual conditions. When the cutter shaft is small in size and the driving force of the oil cylinder is strong, one set of adjustment components can be provided; when the cutter shaft is large in size and the power of one oil cylinder obviously cannot meet the requirements, multiple sets of adjustment components can be provided. When the adjustment components are provided as one group, only one oil cylinder is provided, and this oil cylinder is fixed to the inner wall of the cutter shaft. The pressure rod is arranged in a ring shape in the sealing interlayer between the cutter shaft and the drive shaft, and the output shaft of the oil cylinder is connected to the pressure rod; the number of connecting rod assemblies and transmission rods corresponds to the number of blades in the same circumferential surface, and the blade rotation axis on the same circumferential surface is connected to the pressure rod through the connecting rod assembly; the blade rotation axis that is collinear along the first direction is connected through the transmission rod; the pressure rod is driven to rise and fall in the first direction by the oil cylinder, and the connecting rod assembly and the transmission rod are actuated to drive the blade on the blade shaft to rotate around its own axis, thereby adjusting the angle adjustment of the blade and the cutting gap between adjacent blades. When multiple adjustment assemblies are used, the number of oil cylinders and pressure rods also corresponds to the number of blades. The number of connecting rod assemblies and transmission rods still corresponds one-to-one with the number of blades within the same circumference. In this case, multiple pressure rods are evenly distributed along the same circumference of the cutterhead shaft, and the oil cylinders and pressure rods are connected one-to-one. The connecting rod assemblies are connected to the corresponding pressure rods, and the transmission rods are used to connect the rotating shafts that are collinear along the first direction. The operating principle is the same as described above. By setting up the adjustment assemblies, all blades on the blade shaft can be synchronized and rotated at the same angle, meeting the dynamic balance requirements of high-speed rotation.

[0035] 3. The conveying assembly in the present invention is used to supply oil to the angle adjustment mechanism. The conveying assembly includes a support plate, an oil circuit slewing ring, and an oil circuit conveying ring, wherein the support plate is used to fix the oil circuit slewing ring in the first shell, and an oil transmission channel is opened in one of the support plates to connect the oil circuit channel in the oil circuit slewing ring with the external oil supply system; the oil circuit conveying ring rotates with the cutter shaft, and the oil circuit conveying ring is also connected to the oil circuit slewing ring, and is connected to the oil inlet of one of the oil cylinders and the oil outlet of the last oil cylinder. Through this setting, there is no oil circuit entanglement or knotting during the rotation of the cutter shaft, thereby improving the working stability of the cutter shaft. The oil cylinders in multiple adjustment assemblies are connected in series in sequence. Through this setting, the oil flow rate of each oil cylinder can be the same, which can ensure that the displacement of the output shaft of each oil cylinder is the same, and the blade angle adjustment amount is consistent. All blades are realized to rotate synchronously with the action of the oil cylinder, so that it meets the dynamic balance requirements of high-speed rotation.

[0036] 4. The pulverizing equipment for biomass crushing and screening in the present invention, when working as an independent crushing and screening system, has an air blowing, material carrying and slag discharge device including a second shell with an air inlet and a slag discharge port, and a dividing block, an air blowing ring, an air guide table and a slag discharge plate arranged in the second shell; the dividing block is conical in shape, and its axis is collinear with the axis of the drop pipe, and the material falling through the drop pipe is evenly distributed along the conical surface of the dividing block. The air guide table is directly opposite the air inlet, and the air flow direction is changed by setting the air guide table, guiding the air flow upward into the air blowing ring. The air blowing ring has curved air guide holes, which can change the wind speed and direction. The air flow through the air guide holes carries the material that has slid down from the dividing block and blows it in an oblique direction into the first shell, and cooperates with the blade above to achieve a good crushing and screening effect. The slag discharge plate is tilted to facilitate the discharge of large pieces of material.

[0037] 5. The pulverizing equipment for biomass crushing and screening of the present invention can also perform secondary crushing and screening on the materials from the primary crushing system. When in use, it is only necessary to use the original primary crushing system of the mill as the blowing, material carrying and slag discharging device of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of the pulverizing equipment for biomass crushing and screening in Example 1 of the present invention;

[0039] Figure 2 This is a schematic diagram of the internal structure of the pulverizing equipment for biomass crushing and screening in Example 1 of the present invention;

[0040] Figure 3 Schematic diagram of the structure of the drive mechanism and cutter disc assembly in Example 1 of the present invention;

[0041] Figure 4 for Figure 3 Cross-section of

[0042] Figure 5 Schematic diagram of the structure of the lower shell in Example 1 of the present invention;

[0043] Figure 6 for Figure 5 sectional view of

[0044] Figure 7 for Figure 6 A magnified schematic diagram of point A in the middle;

[0045] Figure 8 for Figure 6 A magnified schematic diagram of point B in the middle;

[0046] Figure 9 Schematic cross-sectional view of the oil circuit slewing ring in an embodiment of the present invention;

[0047] Figure 10A schematic structural diagram of the air blowing, material carrying and slag discharge device in Example 1 of the present invention;

[0048] Figure 11 for Figure 10 sectional view of

[0049] Figure 12 This is a schematic structural diagram of a material separation and air blowing mechanism in Example 1 of the present invention;

[0050] Figure 13 This is a schematic structural diagram of a pulverizing device for biomass crushing and screening in Example 4 of the present invention;

[0051] Figure 14 This is a schematic structural diagram of a pulverizing device for biomass crushing and screening in Example 5 of the present invention;

[0052] In the figure: 1. First housing; 101. Upper housing; 102. Lower housing; 103. Discharge port; 104. Protrusion; 2. Dropping pipe; 3. Driving mechanism; 301. Driving motor; 302. Transmission component protective cover; 303. Driving shaft; 4. Cutter assembly; 401. Cutter shaft; 402. Angle adjustment mechanism; 4021. Driver; 4022. Pressure rod; 4023. First connecting rod; 4024. Second connecting rod; 4025. Transmission rod; 403. Blade; 404. Rotating shaft; 5. Blowing and carrying slag discharge device; 501. Second housing; 502. Air inlet; 503. Slag discharge port; 504. Material dividing block; 5 05. Blowing ring; 506. Air guide hole; 507. Slag discharge plate; 508. Air guide platform; 6. Conveying assembly; 601. Support plate; 6011. Oil inlet pipe; 6012. Oil return pipe; 602. Oil circuit slewing ring; 6021. Oil inlet channel; 6022. Oil return channel; 603. Oil circuit conveying ring; 604. Dynamic seal; 7. Return material coarse crushing device; 8. Mill primary crushing system; 9. Roller mill; 901. Drive device; 902. Transmission support part; 903. Shell support rod seat; 904. Slag discharge port; 905. Nozzle ring; 906. Grinding disc; 907. Grinding roller; 908. Loading device; 909. Air inlet. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In addition, it should be understood that for the convenience of description, the sizes of the various components shown in the drawings are not drawn according to the actual scale.

[0056] It should be noted that like numbers and letters represent similar items in the following figures, so once an item is defined or described in one figure, it will not need to be further discussed and described in detail in the description of the subsequent figures.

[0057] Example 1:

[0058] like Figures 1-4 As shown, a pulverizing device for biomass crushing and screening includes: a first shell 1, a drop pipe 2, a drive mechanism 3, a cutter head assembly 4 and a conveying assembly 6; the axis of the first shell 1 extends along a first direction (the first direction in this embodiment is the vertical direction in the accompanying drawings), and one side of the first shell 1 has a discharge port 103, through which powder that meets the fineness requirements is discharged; the interior of the first shell 1 is hollow and has a top opening and a bottom opening, and the bottom opening is used to connect with a blowing material carrying and slag discharge device, which is used to blow material into the first shell 1 and discharge material that is difficult to crush. The drop pipe 2 extends into the first shell 1 along the top opening, and the axis of the drop pipe 2 is collinear with the axis of the first shell 1. The material in the drop pipe 2 is discharged from top to bottom and then blown upward into the first shell 1 by the blowing material carrying and slag discharge device.

[0059] The driving mechanism 3 is installed on the first shell 1, and the output end of the driving mechanism 3 extends into the first shell 1 along the top opening of the first shell 1. The output end of the driving mechanism 3 can be rotatably sleeved on the outer periphery of the blanking tube 2 around its own axis, and the output end of the driving mechanism 3 and the top opening of the first shell 1 are rotatably sealed to prevent the material in the first shell from being discharged through the gap between the top opening and the driving mechanism 3, interfering with the discharge of the discharge port 103, and preventing dust and the like from entering the first shell 1 or the driving mechanism 3 from the outside; the axis of the output end of the driving mechanism 3 is collinear with the axis of the first shell 1; in this embodiment, the driving mechanism 3 includes a driving motor 301, a transmission assembly and a driving shaft 303; the driving shaft 303 is the output end of the above-mentioned driving mechanism 3; the driving shaft 303 is located in the first shell 1 and can be rotatably sleeved on the outer periphery of the blanking tube 2 around its own axis, the driving motor 301 is arranged on the first shell 1, and the output shaft of the driving motor 301 is connected to the driving shaft 303 through the transmission assembly to drive the driving shaft 303 to rotate around its own axis. A transmission assembly protective cover 302 is provided on the outside of the transmission assembly to protect the transmission assembly. The transmission assembly can utilize a conventional belt or sprocket chain transmission mechanism to achieve the desired transmission effect. Rotatable sealing mechanisms (conventional rotary sealing mechanisms will suffice) are provided between the drive shaft 303 and the top opening of the first housing 1, and between the bottom of the drive shaft 303 and the drop tube 2. These sealing mechanisms prevent powder from entering the gap between the drive shaft 303 and the drop tube 2 without affecting the rotation of the drive shaft 303, and also prevent dust and other substances from entering the drive mechanism 3 from the outside. Adjusting the speed of the drive motor 301 allows for stepless control of the cutterhead shaft 401's rotational speed.

[0060] like Figure 2-Figure 4 As shown, the cutter disc assembly is arranged in the first shell 1 and is located below the discharge port 103. The cutter disc assembly 4 includes a cutter disc shaft 401, an angle adjustment mechanism 402 and a plurality of blades 403; the cutter disc shaft 401 is arranged in the first shell 1 and is sleeved on the outer periphery of the drive shaft 303, so that the drive shaft 303 drives the cutter disc shaft 401 to rotate around its own axis, and a sealing interlayer is formed between the inner wall of the cutter disc shaft 401 and the outer wall of the drive shaft 303, and the angle adjustment mechanism 402 is arranged in this sealing interlayer to prevent powder from interfering with the operation of the angle adjustment mechanism 402; one end of the plurality of blades 403 is rotatably arranged on the outer peripheral wall of the cutter disc shaft 401 around its own axis, and the other end of the plurality of blades 403 extends in a direction away from the cutter disc shaft 401, and the angle adjustment mechanism 402 is connected to the blades 403 in a one-to-one correspondence to control the rotation of the blades 403 around their own axis;

[0061] like Figure 5-Figure 6As shown, the conveying assembly 6 is arranged above the cutter head shaft 401. The conveying assembly 6 is connected to the angle adjustment mechanism 402 and is used to provide driving force for the angle adjustment mechanism 402. Under the action of the angle adjustment mechanism 402, the blade 403 can rotate around its own axis, thereby adjusting the angle of the blade 403 and the cutting gap between adjacent blades 403. If the ventilation resistance is too large or too small, a certain lift or resistance can be provided by adjusting the angle of the blade 403, thereby achieving real-time dynamic control of the ventilation resistance and powder fineness in the first shell 1. While meeting the fineness requirements of different working conditions, the stable operation of the entire grinding system is ensured.

[0062] In this embodiment, one end of each blade 403 has a rotating shaft 404, and the axis of the rotating shaft 404 and the axis of the blade 403 are collinear and extend along a second direction (the second direction in this embodiment is the horizontal direction in the accompanying drawings). The multiple blades 403 are connected to the angle adjustment mechanism 402 via their own rotating shafts 404, and the second direction is perpendicular to the first direction. By providing the rotating shaft 404, it is convenient to connect the angle adjustment mechanism 402 with the blades 403. The angle adjustment mechanism 402 can adjust the angle of the blade 403 by directly controlling the rotating shaft 404, which is simple, fast and highly stable. In this embodiment, multiple layers of blade groups are arranged along the first direction on the cutter disc shaft 401, and each layer of blade groups has multiple blades 403 evenly distributed along the circumferential surface of the cutter disc shaft 401. In addition, along the first direction, the blade rotating shafts 404 on two adjacent circumferential surfaces are collinear along the first direction. This arrangement facilitates the connection between the angle adjustment mechanism and the blades.

[0063] Specifically, when the cutter shaft 401 is large in size or requires higher stability, such as Figure 6-Figure 8As shown, the angle adjustment mechanism 402 includes a plurality of adjustment components, each of which includes a driver 4021, a pressure rod 4022, a plurality of connecting rod components and a plurality of transmission rods 4025; the pressure rods 4022 in each of the adjustment components are distributed along the same circumferential surface of the cutter head shaft 401, the number of drivers 4021 corresponds to the number of pressure rods 4022, the driver 4021 is installed on the inner wall of the cutter head shaft 401, and the output end of the driver 4021 is connected to the pressure rod 4022 to drive the pressure rod 4022 to move along the first direction. The number of connecting rod assemblies and transmission rods 4025 corresponds to the number of blades 403 on the same circumferential surface. The first ends of the multiple connecting rod assemblies are hinged to the pressure rod 4022, and the second ends of the multiple connecting rod assemblies are correspondingly connected to the rotary shaft 404 located on the same circumferential surface on the cutter head shaft 401. The multiple transmission rods 4025 extend along the first direction and are used to connect to one side of the rotary shaft 4025 that is collinear along the first direction to cause the blades 403 that are collinear along the first direction to rotate synchronously. With the above arrangement, it is only necessary to ensure that the driver 4021 operates synchronously to drive all blades 403 on the cutter head shaft 401 to adjust synchronously, and the blades 403 rotate at the same angle, so that they meet the dynamic balance requirements during high-speed rotation.

[0064] like Figure 8 As shown, the connecting rod assembly includes a first connecting rod 4023 and a second connecting rod 4024; the first end of the first connecting rod 4023 is hinged to the pressure rod 4022, the first end of the second connecting rod 4024 is hinged to the second end of the first connecting rod 4023, and the second end of the second connecting rod 4024 is fixedly connected to the corresponding rotating shaft 404. In this embodiment, the connecting rod assembly is composed of the first connecting rod 4023 and the second connecting rod 4024, which are hinged together. The structure is simple and can drive the rotating shaft 404 to rotate in conjunction with the pressure rod 4022, thereby adjusting the angle of the blade 403.

[0065] Specifically, the driver 4021 is selected as a cylinder; among the cylinders of all the adjustment components, the oil inlet of one cylinder is connected to the conveying component 6, and the oil outlet of this cylinder is connected to the oil inlet of the next cylinder, and the remaining cylinders are connected in series in sequence until the oil outlet of the last cylinder is connected to the conveying component. The cylinder is used as the driver, and its output power is stable. The series connection between the cylinders makes the oil flow of each cylinder the same, which can ensure that the displacement of the output shaft of each cylinder is the same, and the blade angle adjustment amount is consistent. It is achieved that all the blades in the first shell rotate synchronously with the action of the cylinder, meeting the dynamic balance requirements of the blades in the first shell rotating at high speed with the cutter shaft. In specific implementation, under the premise of meeting stable power output, a cylinder or other driving mechanism can also be selected.

[0066] like Figure 7-Figure 9As shown, in this embodiment, the conveying assembly 6 includes a support plate 601, an oil circuit rotating ring 602 and an oil circuit conveying ring 603; the oil circuit rotating ring 602 is fixed in the first shell 1 through the support plate 601, and the oil circuit rotating ring 602 is located above the cutter head shaft 401, and an oil delivery channel is opened in one of the support plates 601 for connecting the oil circuit channel in the oil circuit rotating ring 602 with the external oil supply system, the oil circuit conveying ring 603 is fixed to the upper end surface of the cutter head shaft 401, the oil circuit rotating ring 602 and the oil circuit conveying ring 603 are rotatably sealed and connected, and the oil circuit conveying ring 603 is used to connect the oil inlet of one of the oil cylinders and the oil outlet of the last oil cylinder with the oil circuit channel in the oil circuit rotating ring 602; the central through hole of the oil circuit rotating ring 602 and the oil circuit conveying ring 603 is used for the drive shaft 303 to pass through. The oil circuit slewing ring 602 and the oil circuit delivery ring 603 cooperate similarly to a multi-channel rotary joint. The oil circuit slewing ring 602 is fixed to the first housing 1 via the support plate 601 and does not rotate with the cutterhead shaft 401. The oil circuit delivery ring 603 is fixed to the upper end of the cutterhead shaft 401 and rotates with the cutterhead shaft.

[0067] Specifically, the oil delivery channel in the support plate 601 includes an oil inlet pipe 6011 and an oil return pipe 6012; Figure 9 As shown, the oil circuit slewing ring 602 defines an annular oil inlet channel 6021 and an annular oil return channel 6022. The oil circuit slewing ring 602 is in close contact with the oil circuit transfer ring 603. Dynamic seals 604 are provided between the oil inlet channel 6021 and the oil return channel 6022, as well as between the oil circuit slewing ring 603 and the oil circuit transfer ring 603, to prevent oil leakage during relative rotation. The oil inlet pipe 6011 is connected to the oil inlet channel 6021, and the oil return pipe 6012 is connected to the oil return channel 6022. The oil circuit transfer ring 603 defines vertically distributed oil inlet and return lines. The oil inlet line connects the oil inlet channel 6021 to the oil inlet of one of the cylinders, while the oil return line connects the oil outlet of the last cylinder to the oil return channel 6022. This arrangement prevents oil entanglement or kinking during cutterhead shaft rotation, improving the operational stability of the cutterhead shaft. An oil control system is also provided outside to control the oil supply to the cylinder to adjust the angle of the blade.

[0068] like Figure 10 and Figure 11As shown, the blowing material carrying and slag removal device 5 in this embodiment includes a second shell 501 and a material-dividing and blowing mechanism for evenly dividing the falling material and changing the air flow rate and direction; the second shell 501 is connected to the bottom opening of the first shell 1, and the inner cavity of the second shell 501 is connected to the inner cavity of the first shell 1; the material-dividing and blowing mechanism is arranged on the inner wall of the second shell 501; an air inlet 502 is opened on one side of the second shell 501, and the air inlet 502 is located below the material-dividing and blowing mechanism, and a slag discharge port 507 is opened on the other side of the second shell 501. The air flow enters the second shell 501 through the air inlet 502, and after the flow rate and direction are adjusted by the material-dividing and blowing mechanism, the material discharged from the drop pipe 2 is blown to the blade 403 for crushing and screening. The material with qualified fineness is discharged through the discharge port 103, and the material that is difficult to crush is discharged through the slag discharge port 503.

[0069] like Figure 12 As shown, the material dividing and blowing mechanism includes a dividing block 504 arranged in sequence along the blanking direction for evenly dividing the falling material and a blowing ring 505 for changing the air flow rate and direction, the dividing block 504 is conical, and the blowing ring 505 has a top surface, a bottom surface and a conical surface connecting the top surface and the bottom surface; the top surface area of the blowing ring 505 is smaller than the bottom surface area of the blowing ring 505, the dividing block 504 is located on the top surface of the blowing ring 505, the axis of the dividing block 504 and the axis of the blowing ring 505 are both collinear with the axis of the blanking tube 2, and the bottom surface area of the dividing block 504 is larger than the top surface area of the blowing ring 505; the conical surface of the blowing ring 505 is provided with a plurality of air guide holes 506 extending from the conical surface to its bottom surface, and the plurality of air guide holes 506 are all curved and evenly distributed along the conical surface of the blowing ring. The dividing block 504 is conical in shape, and its axis is collinear with the axis of the drop tube. The material falling through the drop tube is evenly distributed along the conical surface of the dividing block. The bottom diameter of the dividing block 504 is larger than the diameter of the outlet end of the drop tube 2. The material falling through the drop tube 2 is evenly distributed along the conical surface of the dividing block 504. The blowing ring 505 is provided with a conical surface, and the upper end of the conical surface is a small diameter end, and the lower end is a large diameter end, so that the material evenly distributed by the dividing block 504 can slide freely along the conical surface of the blowing ring 505. The above setting can effectively improve the uniformity of the material distribution. The air guide holes 506 are all curved, so that the air flow passing through the air guide holes 506 can blow the material in an inclined direction, and cooperate with the blades on the cutter shaft to achieve a good crushing and screening effect.

[0070] In this embodiment, the ratio of the bottom area of the dividing block 504 to the top area of the blowing ring 505 is 1:0.95 to 1:0.8. This configuration allows the bottom area of the dividing block 504 to be slightly larger than the top area of the blowing ring 505, ensuring that the material can slide down the conical surface of the dividing block 504 to the conical surface of the blowing ring 505, thereby preventing material from accumulating at the junction of the dividing block 504 and the blowing ring 505. The ratio of the top area of the blowing ring 505 to the bottom area of the blowing ring is 1:5 to 1:20. The specific ratio needs to be designed based on the size of the material's angle of repose to allow the material to slide freely on the blowing ring.

[0071] Specifically, the width of the air guide holes 506 gradually increases from the center to the circumference of the blowing ring 505. This arrangement, combined with the curved structure of the air guide holes themselves, distributes the airflow through the air guide holes along an inclined direction. The width of the air guide holes 503 gradually increases from the top to the bottom of the blowing ring 505. This arrangement prevents materials from getting stuck in the air guide holes during the falling process.

[0072] like Figure 11 As shown, the device further includes a discharge air guide mechanism, which includes a slag discharge plate 507 and an air guide platform 508. The slag discharge plate 507 is tilted and disposed within the second housing 501. One side of the slag discharge plate 507 is located below the air inlet 502, and the other side of the slag discharge plate 507 is located below the slag discharge port 503. The side of the slag discharge plate 507 near the air inlet 502 is higher than the side near the slag discharge port 503. The air guide platform 508 is fixed to the slag discharge plate 507. The axis of the air guide platform 508 is collinear with the blowing ring 505, and the top surface of the air guide platform 508 is close to or in contact with the bottom surface of the blowing ring 505. The air guide platform 508 is in the shape of a truncated cone. The air guide platform 508 can disperse the wind coming from the air inlet 502 as evenly as possible on the bottom surface of the blowing ring 505 under the guiding effect of the air guide platform 508, so that the air volume and wind speed passing through each air guide hole 503 are basically consistent.

[0073] The air-blowing material-carrying and slag-discharging device 5 also includes a return material coarse crushing device 7, a first end of which is connected to the slag discharge port 503, and a second end of which is connected to the drop pipe 2. The return material coarse crushing device has both material return and crushing functions. After coarse crushing, the material is sent to the drop pipe for further crushing and screening.

[0074] In this embodiment, the first shell 1 includes an upper shell 101 and a lower shell 102 that are connected; the discharge port 103 is opened in the upper shell 101, and the cutter head assembly 4 is arranged in the lower shell 102. The inner wall surface of the lower shell 102 has a turbulent layer to form turbulence when the material approaches the inner wall of the lower shell. This arrangement can further disturb the material rising with the airflow, prevent the material from adhering to the inner wall of the lower shell, and improve the crushing effect of the material. Specifically, the turbulent layer protrudes from the inner wall surface of the first shell 1, and the turbulent layer has raised blocks 104 distributed in a spiral line; or it is composed of a plurality of annular raised blocks 104 arranged in sequence, or other structures that can disturb the material.

[0075] When used specifically:

[0076] The air flow enters through the air inlet 502, and the air is guided, evenly distributed and speed-regulated by the air guide table 508 and the blowing ring 505. The material (or light material) crushed by the primary crushing system enters through the drop pipe 2, and the dividing block 504 evenly distributes the material falling from the drop pipe 2 on the blowing ring 505 below. The air flow blown up by the blowing ring 505 blows the material in an inclined direction to the cutter disc assembly, and the cutter disc assembly 4 fully collides with the incoming biomass material. The biomass material subjected to high-speed impact is further crushed and finally discharged from the discharge port 103. The difficult-to-crush material falls along the air guide hole 506 of the blowing ring 505 onto the slag discharge plate 507, and then is discharged from the slag discharge port 503 through the slag discharge plate 507. A return material coarse crushing device 7 can be set at the slag discharge port 503 to coarsely crush the large particles that are difficult to crush and then transport them to the drop pipe for crushing again. During the crushing process, the speed of the drive motor 301 is adjusted to achieve stepless control of the speed of the cutterhead shaft 401. To change the powder fineness or ventilation resistance, the external oil control system adjusts the oil supply to the cylinder, causing the cylinder's output shaft to move in a first direction, driving the pressure rod 4022 up and down. Driven by the first connecting rod 4023, the second connecting rod 4024, and the transmission rod 4025, the blades 403 on the cutterhead shaft 401 rotate synchronously and adjust to a uniform angle.

[0077] During the adjustment process: Under the high-speed rotation of the blade 403, the rotation of the blade 403 will provide a certain lift or resistance to the material rising with the airflow, which may cause the material to easily pass through the gap between the blades 403 or not easily pass through the gap between the blades 403, thereby playing a role in screening and adjusting the fineness of the material. From another perspective, when the blade 403 rotates, the cutting gap between adjacent blades 403 on the same circumferential surface changes continuously, intercepting larger particles of material for further cutting and crushing, while the material that meets the fineness requirements can pass through the cutting gap and be discharged through the discharge port 103, thereby playing a screening role. In addition, if the ventilation resistance is too large or too small, a certain lift or resistance can be provided by adjusting the angle of the blade, thereby achieving real-time dynamic control of the powder fineness and ventilation resistance in the first shell. While meeting the fineness requirements of different working conditions, the stable operation of the entire grinding system is ensured.

[0078] Example 2:

[0079] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0080] In this embodiment, the cutter shaft is relatively small and the driving force of the oil cylinder is relatively strong. By setting a set of adjustment components, all the blades on the cutter shaft 401 can be driven to rotate synchronously.

[0081] Specifically: the angle adjustment mechanism 402 includes an adjustment component; the adjustment component includes a driver 303, a pressure rod 4022, multiple connecting rod assemblies and multiple transmission rods 4025; the pressure rod 4022 is distributed on the inner wall of the cutter disc shaft 401 along the circumference of the cutter disc shaft 401, that is, the pressure rod 4022 is annular, and the driver 4021 is installed on the inner wall of the cutter disc shaft 401, and the output end of the driver 4021 is connected to the pressure rod 4022 to drive the pressure rod 4022 to rise and fall along the first direction, and the first ends of the multiple connecting rod assemblies are hinged to the pressure rod 4022, and the second ends of the multiple connecting rod assemblies are connected one-to-one with the rotating shaft 404 of the blade 403 located on the same circumferential surface of the cutter disc shaft 401, and the multiple transmission rods 4025 all extend along the first direction, and the multiple transmission rods 4025 are used to connect one side of the rotating shaft 404 that is collinear along the first direction, so that the blades 403 that are collinear along the first direction rotate synchronously. During implementation, driver 303 is a hydraulic cylinder. There is only one driver 303 and one pressure rod 4022. The number of connecting rod assemblies and transmission rods 4025 corresponds to the number of blades on the same circumferential surface. An external oil control system controls the oil supply to the cylinder, thereby adjusting the displacement of the cylinder output shaft. This causes the cylinder output shaft to move in a first direction, driving the pressure rod up and down. Driven by the first connecting rod, second connecting rod, and transmission rod, the blades on the cutterhead shaft are synchronously adjusted to a uniform angle. This achieves real-time dynamic control of the ventilation resistance and powder fineness within the first housing, meeting dynamic balancing requirements during high-speed rotation.

[0082] Example 3:

[0083] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0084] The angle adjustment structure includes an adjustment component; the adjustment component includes a pressure rod 4022, multiple drivers 4021, multiple connecting rod assemblies and multiple transmission rods 4025; in this embodiment, the pressure rod 4022 is annular, and the pressure rod 4022 is arranged on the inner wall of the cutter disc shaft 401 along the circumference of the cutter disc shaft 401, and the output ends of multiple drivers 4021 are connected to the pressure rod 4022 to synchronously drive the pressure rod 4022 to rise and fall along the first direction, the first ends of multiple connecting rod assemblies are hinged to the pressure rod 4022, and the second ends of multiple connecting rod assemblies are connected one-to-one with the rotating shaft 404 of the blade located on the same circumferential surface on the cutter disc shaft 401, and the multiple transmission rods 4025 extend along the first direction, and the multiple transmission rods 4025 are used to connect one side of the rotating shaft 404 that is collinear along the first direction, so that the blades 403 that are collinear along the first direction rotate synchronously. The adjustment assembly in this embodiment can simplify the number of pressure rods 4022 and can also achieve synchronous rotation of all blades 403 on the cutter head shaft 401.

[0085] Example 4:

[0086] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0087] like Figure 13 As shown, the air-blowing and slag-carrying device 5 is the mill's primary crushing system 8. The first housing is directly mounted to the mill's primary crushing system. Material falls through the drop pipe 2 and is ground and crushed by the mill's primary crushing system. The high-speed airflow from the primary crushing system 8 then carries the material into the first housing 101. The cutterhead assembly 4 fully impacts the incoming biomass material, further crushing it under high-speed impact before it is discharged from the discharge port 103 of the first housing 1. Recalcitrant material is discharged through the mill's slag-carrying system or enters the mill's built-in return device for further crushing. During the crushing process, the speed of the cutterhead shaft 401 is adjusted by adjusting the speed of the drive motor 301 to achieve stepless control of its rotation speed. The oil supply to the cylinder is regulated by an external oil control system, allowing the blades 403 on the cutterhead shaft 401 to be synchronously adjusted to a uniform angle. This achieves real-time dynamic control of the ventilation resistance and powder fineness within the first housing 1, meeting dynamic balancing requirements during high-speed rotation.

[0088] Example 5:

[0089] This embodiment is the same as embodiment 1 except for the following technical solutions:

[0090] like Figure 14As shown, the air-blowing, material-carrying, and slag-discharging device 5 is a roller mill 9, with the bottom opening of the first housing 1 docking with the roller mill 9. During operation, the drive device 901 of the roller mill 9 operates, driving the transmission support 902, thereby rotating the grinding disc 906, which in turn drives the grinding roller 907 to rotate. The loading device 908 adjusts the loading force of the grinding roller in real time. Material falls through the drop pipe 2, where it is flung toward the periphery by the centrifugal force of the rotating grinding disc 906 and subsequently ground by the grinding roller 907. Airflow enters through the air inlet 909 and is blown upward through the nozzle ring 905, blowing the material ground by the grinding roller 907 to the cutterhead assembly 4 for secondary grinding. Impurities that cannot be carried by the airflow are discharged through the slag discharge port 904.

[0091] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pulverizing device for biomass crushing and screening, characterized in that: include: A first shell, wherein the axis of the first shell extends along a first direction, a discharge port is provided on one side of the first shell, the interior of the first shell is hollow and has a top opening and a bottom opening, and the bottom opening is used to connect to a blowing, carrying and slag discharging device; a drop tube extending along the top opening into the first housing, wherein the axis of the drop tube is collinear with the axis of the first housing; A drive mechanism, wherein the drive mechanism is mounted on the first housing, an output end of the drive mechanism extends into the first housing along the top opening, the output end of the drive mechanism is rotatably sleeved around the outer circumference of the blanking tube about its own axis, and the output end of the drive mechanism is rotatably sealed to the top opening, and the axis of the output end of the drive mechanism is collinear with the axis of the first housing; A cutter disc assembly; the cutter disc assembly is arranged in the first housing and is located below the discharge port, and the cutter disc assembly includes a cutter disc shaft, an angle adjustment mechanism and a plurality of blades; the cutter disc shaft is arranged in the first housing and is sleeved on the outer periphery of the output end of the drive mechanism, so that the output end of the drive mechanism drives the cutter disc shaft to rotate around its own axis, and a sealed interlayer is formed between the cutter disc shaft and the output end of the drive mechanism; one end of the plurality of blades is rotatably arranged on the outer peripheral wall of the cutter disc shaft around its own axis, and the other ends of the plurality of blades extend in a direction away from the cutter disc shaft, and the angle adjustment mechanism is arranged in the sealed interlayer and is correspondingly connected to the blades to control the rotation of the blades around their own axes; The conveying assembly is arranged above the cutter disc shaft, and the conveying assembly is connected to the angle adjustment mechanism to provide driving force for the angle adjustment mechanism.

2. The pulverizing equipment for biomass crushing and screening according to claim 1, characterized in that: Each blade has a rotating shaft at one end, the axis of the rotating shaft and the axis of the blade are collinear and extend along the second direction, and the plurality of blades are connected to the angle adjustment mechanism through their own rotating shafts, and the second direction is perpendicular to the first direction.

3. The milling equipment for biomass crushing and screening according to claim 2, characterized in that: The angle adjustment mechanism includes an adjustment assembly; the adjustment assembly includes a driver, a pressure rod, a plurality of connecting rod assemblies and a plurality of transmission rods; the pressure rod is arranged on the inner wall of the cutter disc shaft along the circumference of the cutter disc shaft, the output end of the driver is connected to the pressure rod to drive the pressure rod to rise and fall along the first direction, the first ends of the plurality of connecting rod assemblies are hinged to the pressure rod, the second ends of the plurality of connecting rod assemblies are connected one-to-one with the rotary shafts of the blades located on the same circumferential surface of the cutter disc shaft, the plurality of transmission rods extend along the first direction, and the plurality of transmission rods are used to connect one side of the rotary shafts that are collinear along the first direction so that the blades that are collinear along the first direction rotate synchronously; Or, the angle adjustment structure includes an adjustment component; the adjustment component includes a pressure rod, multiple drivers, multiple connecting rod assemblies and multiple transmission rods; the pressure rod is arranged on the inner wall of the cutter disc shaft along the circumference of the cutter disc shaft, and the output ends of multiple drivers are connected to the pressure rod to synchronously drive the pressure rod to rise and fall along the first direction, the first ends of multiple connecting rod assemblies are hinged to the pressure rod, and the second ends of multiple connecting rod assemblies are connected one-to-one with the rotating axes of the blades located on the same circumferential surface of the cutter disc shaft, and multiple transmission rods extend along the first direction, and multiple transmission rods are used to connect one side of the rotating axes that are collinear along the first direction so that the blades that are collinear along the first direction rotate synchronously.

4. The milling equipment for biomass crushing and screening according to claim 2, characterized in that: The angle adjustment mechanism includes multiple adjustment components, each of which includes a driver, a pressure rod, multiple connecting rod assemblies and multiple transmission rods; the pressure rods in each adjustment component are distributed along the same circumferential surface of the cutter disc shaft, the output end of the driver is connected to the pressure rod to drive the pressure rod to rise and fall along the first direction, the first ends of the multiple connecting rod assemblies are hinged to the pressure rod, and the second ends of the multiple connecting rod assemblies are correspondingly connected to the rotating shafts on the same circumferential surface of the cutter disc shaft, the multiple transmission rods extend along the first direction, and the multiple transmission rods are used to connect one side of the rotating shaft that is collinear along the first direction, so that the blades that are collinear along the first direction rotate synchronously.

5. The milling equipment for biomass crushing and screening according to claim 4, characterized in that: The driver is a cylinder; among the cylinders of all the adjustment components, the oil inlet of one cylinder is connected to the conveying component, the oil outlet of this cylinder is connected to the oil inlet of the next cylinder, and the remaining cylinders are connected in series in sequence until the oil outlet of the last cylinder is connected to the conveying component.

6. The milling equipment for biomass crushing and screening according to claim 5, characterized in that: The conveying assembly includes a support plate, an oil circuit swivel ring and an oil circuit conveying ring; the oil circuit swivel ring is fixed in the first shell by the support plate, and the oil circuit swivel ring is located above the cutter disc shaft, and an oil delivery channel is opened in one of the support plates to connect the oil circuit channel in the oil circuit swivel ring with the external oil supply system, the oil circuit conveying ring is fixed to the upper end surface of the cutter disc shaft, the oil circuit swivel ring and the oil circuit conveying ring are rotatably sealed and connected, and the oil circuit conveying ring is used to connect the oil inlet of one of the oil cylinders and the oil outlet of the last oil cylinder with the oil circuit channel in the oil circuit swivel ring; the central through hole of the oil circuit swivel ring and the oil circuit conveying ring is used for a driving member that drives the cutter disc shaft to rotate around its own axis to pass through.

7. The milling equipment for biomass crushing and screening according to claim 6, characterized in that: The oil delivery channel in the support plate includes an oil inlet pipe and an oil return pipe; an annular oil inlet channel and an annular oil return channel are provided in the oil circuit rotating ring, the oil inlet pipe is connected to the oil inlet channel, and the oil return pipe is connected to the oil return channel; an oil inlet pipeline and an oil return pipeline distributed in a vertical direction are provided on the oil circuit delivery ring, the oil inlet pipeline connects the oil inlet channel with the oil inlet port of one of the oil cylinders, and the oil return pipeline connects the oil outlet port of the last oil cylinder with the oil return channel.

8. The milling equipment for biomass crushing and screening according to claim 1, characterized in that: The air blowing, carrying and slag discharge device includes a second shell and a material-dividing and blowing mechanism for evenly dividing the falling materials and changing the airflow velocity and direction; the second shell is connected to the bottom opening of the first shell, and the inner cavity of the second shell is connected to the inner cavity of the first shell; the material-dividing and blowing mechanism is arranged on the inner wall of the second shell; an air inlet is provided on one side of the second shell, and the air inlet is located below the material-dividing and blowing mechanism, and a slag discharge port is provided on the other side of the second shell; Preferably, the material dividing and blowing mechanism comprises dividing blocks arranged in sequence along the blanking direction for evenly dividing the falling materials and a blowing ring for changing the airflow velocity and direction, the dividing block is conical, and the blowing ring has a top surface, a bottom surface and a conical surface connecting the top surface and the bottom surface; the top surface area of the blowing ring is smaller than the bottom surface area of the blowing ring, the dividing block is located on the top surface of the blowing ring, the axis of the dividing block and the axis of the blowing ring are both collinear with the axis of the blanking pipe, and the bottom surface area of the dividing block is larger than the top surface area of the blowing ring; the conical surface of the blowing ring is provided with a plurality of air guide holes extending from the conical surface to its bottom surface, and the plurality of air guide holes are all curved and evenly distributed along the conical surface of the blowing ring; Preferably, a discharge air guide mechanism is further included, the discharge air guide mechanism comprising a slag discharge plate and an air guide platform; the slag discharge plate is tiltedly arranged in the second shell body, one side of the slag discharge plate is located below the air inlet, the other side of the slag discharge plate is located below the slag discharge port, and the side of the slag discharge plate close to the air inlet is higher than the side close to the slag discharge port, the air guide platform is fixed to the slag discharge plate, the axis of the air guide platform is collinear with the blowing ring, and the top surface of the air guide platform is close to or in contact with the bottom surface of the blowing ring; Preferably, it also includes a return material coarse crushing device, the first end of which is connected to the slag discharge port, and the second end of which is connected to the drop pipe, for circulating and crushing large particles of material.

9. The milling equipment for biomass crushing and screening according to claim 1, characterized in that: The air-blowing material-carrying and slag-discharging device is a primary crushing system of the mill. The high-speed airflow of the primary crushing system of the mill carries the material into the first shell, and the difficult-to-crush material is discharged through the mill slag-discharging system.

10. The pulverizing equipment for biomass crushing and screening according to claim 1, characterized in that: The first shell includes an upper shell and a lower shell that are connected to each other; the discharge port is opened in the upper shell, the cutter disc assembly is arranged in the lower shell, and the inner wall surface of the lower shell has a turbulent layer to form turbulence when the material approaches the inner wall of the lower shell; Preferably, the turbulent layer protrudes from the inner wall surface of the first shell, and the turbulent layer is a convex block with a spiral distribution; or is composed of a plurality of annular convex blocks arranged in sequence.

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