WO2019223367A1 - Cylindrical milling rotor, and operation method thereof - Google Patents

Abstract

A cylindrical milling rotor, comprising: a drive disk (1); hammering cutters (2); and a milling cylinder connected to the drive disk and having a cylindrical shape. The hammering cutters (2) are distributed along an outer circumference of the milling cylinder. The milling cylinder comprises at least two annular shell portions (3) and multiple centrifugal guide portions (4), and the at least two annular shell portions (3) are coaxially distributed. The multiple centrifugal guide portions (4) are disposed circumferentially along the annular shell portions (3), and located between two adjacent annular shell portions (3). A gap between two adjacent annular shell portions (3) forms a return channel.

Description

Cylindrical grinding rotor and working method thereof

This application claims priority from a Chinese patent application with a filing date of May 19, 2018 and application number 201810484130.5, the entire contents of which are incorporated herein by reference.

Technical field

The present disclosure relates to the field of milling machines, for example, to a cylindrical milling rotor and a working method thereof.

Background technique

Most of the milling rotors of related technology mills are disc-shaped. For example, in the patents with the application number 201520607006.5, the application number 201320861999.X, and the application number 201521054252.9, the milling rotor is equipped with a hammer disc, a belt and a belt. The toothed ring gear, the graded impeller, and the material guide sleeve which is stationary outside the graded impeller. During operation, the grinding disc drives the hammer blade to rotate at a high speed, and the material is ground in the grinding area composed of the hammer blade and the ring gear. Under the action of negative pressure wind, it enters the classification area composed of the classification impeller and the guide sleeve for classification. The classification impeller rotates at high speed. The tangential velocity of the airflow between the blades of the classification impeller is forced vortex distribution, and the particles of the material enter. After the forced vortex between the classifying blades, the gas drag force of negative pressure wind and the centrifugal force generated by the rotation of the classifying impeller, the fine particle material passes through the blades of the classifying impeller and enters the powder collecting device as the gas drag force is greater than the centrifugal force. In the finished product, the coarse particles are separated from the classifying impeller because the centrifugal force is greater than the drag force of the gas, and then returned to the milling area through the material guide to circulate again.

The grinding rotor of the related art grinding machine has a disk shape, which limits the spatial distribution of the hammer blade in the axial direction of the grinding disk, and the ground material particles cannot be effectively ground in the space flowing from the grinding area to the separating area. Crushing and conveying. At work, the coarse particles of the material are easy to follow the high-speed rotating hammer blade to form a circulating flow, and do idle rotation in the space between the crushing area and the classification area, preventing the timely discharge of fine particles, and easily causing agglomeration and excessive crushing. Consumption of power reduces milling efficiency. When the feeding amount increases and the material is difficult to grind, it is necessary to circulate the material particles multiple times to achieve the required fineness. With the increase of coarse particles, the material-gas ratio increases, and the coarseness of the classification impeller separation is coarse. The particles cannot be quickly and efficiently separated through the stationary guide sleeve, which causes the classification efficiency to decrease.

In the application No. 201410256850.8, the cylindrical crushing rotor uses a multi-stage crushing disk. In the patent No. 201510650758.4, the cylindrical crushing rotor uses a cylindrical crushing rotor, which solves the limitation of the space distribution of the hammer blade and improves the grinding. Powder efficiency and effective conveyance of fine powder; the two patents mentioned above have removed the guide sleeve and simplified the classification structure, but there are still problems in the classification of the powder, because the classification impeller rotates at high speed, and it will be free on the outer edge of the classification impeller. Vortex, some particles will rotate around the classifying impeller with the free vortex. The speed of the free vortex decreases exponentially as the radius of the classifying impeller increases. In the area far from the edge of the classifying impeller, the existence of the free vortex can be ignored, but it is close to the classifying impeller. The area of the outer edge of the impeller has a strong free vortex and cannot be ignored. Some particles in the free vortex have a long residence time, which leads to an increase in the concentration of particles in the classification area, which increases the probability of agglomeration, and interferes with subsequent particles entering the forced vortex between the blades of the classification impeller Grading, the cylindrical pulverizing rotor in the cylindrical pulverizer described above, due to the structure of the cylindrical body, Adherent material particles can not make rapid reflow cycle that affects the classification efficiency.

Summary of the Invention

The disclosure provides a cylindrical milling rotor, which can solve the problem of material forming a circulating flow and excessive power consumption, and can also solve the problem of low classification efficiency due to slow material return, easy agglomeration, adherence, and inability to quickly return to the circulation. The problem.

An embodiment provides a cylindrical milling rotor, including a power disc; a hammer blade; and a cylindrical milling cylinder connected to the power disc and having a cylindrical shape, the hammer blade being along an axial direction of the milling cylinder. Distributed on the outer periphery, the grinding drum includes at least two annular casing portions and a plurality of centrifugal guiding portions, the centrifugal guiding portions are arranged to conduct a backflow function to the material, and the at least two annular casing portions Coaxially distributed, the plurality of centrifugal guide portions are arranged along the circumferential direction of the annular casing portion, and are located between two adjacent annular casing portions, and two adjacent annular casing portions. There is a gap between the body parts to connect the inside and outside of the milling drum and form a backflow channel for coarse particles.

An embodiment also provides a working method of a cylindrical grinding rotor, wherein the above-mentioned cylindrical grinding rotor is used for implementation, and the method includes:

Suspending a classifying impeller in the milling drum, wherein a space between an outer periphery of the classifying impeller and an inner periphery of the milling drum constitutes a classifying zone;

Activating the cylindrical grinding rotor so that material particles enter the classification zone from the open end of the cylindrical grinding rotor; and

The cylindrical milling rotor is driven to rotate at a high speed to form a powerful centrifugal field, so that coarse particles entering the classification zone are separated by the classification impeller, wherein when the coarse particles are close to the cylindrical milling rotor, the The cylindrical milling rotor is captured by the powerful centrifugal field and returned to the outside of the milling cylinder through the return channel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a cylindrical milling rotor provided in Embodiment 1. FIG.

FIG. 2 is a schematic structural view of the cylindrical milling rotor provided in the first embodiment from another perspective.

FIG. 3 is a schematic structural diagram of a milling drum provided in Embodiment 1. FIG.

FIG. 4 is a schematic structural diagram of a cylindrical milling rotor provided in the second embodiment.

FIG. 5 is a schematic structural view of the cylindrical milling rotor provided in Embodiment 2 from another perspective.

FIG. 6 is a schematic diagram of a combined structure of a first annular casing portion and a second annular casing portion in Embodiment 2. FIG.

FIG. 7 is a sectional view of FIG. 6.

FIG. 8 is a schematic structural diagram of a hammer blade provided in the second embodiment.

FIG. 9 is a schematic structural diagram of a cylindrical milling rotor of Embodiment 3. FIG.

FIG. 10 is a schematic structural view of the cylindrical milling rotor of the third embodiment at another angle.

FIG. 11 is a schematic structural diagram of a combination of a first annular casing portion, a second annular casing portion, a centrifugal guide portion, and a hammer blade in the third embodiment.

FIG. 12 is a schematic structural diagram of a power disc of a cylindrical milling rotor in an embodiment.

FIG. 13 is a schematic structural view of a power disc of a cylindrical milling rotor in another embodiment from another perspective.

14 is a schematic structural diagram of a horn-shaped centrifugal guide according to an embodiment.

15 is a sectional view of a horn-shaped centrifugal guide according to an embodiment.

FIG. 16 is a schematic structural diagram of a seamless tube mill according to an embodiment.

FIG. 17 is a schematic structural diagram of a cylindrical milling rotor provided by an embodiment.

FIG. 18 is a schematic structural diagram of a milling drum provided in Embodiment 4. FIG.

FIG. 19 is a schematic structural view of the milling drum provided in Embodiment 4 from another perspective.

FIG. 20 is a schematic structural diagram of a centrifugal guide provided in the fourth embodiment.

FIG. 21 is a flowchart of a working method of a cylindrical milling rotor according to an embodiment.

In the picture: 1: power disc; 2: hammer blade; 21: first connecting portion; 22: second connecting portion; 221, blade; 23: blade; 3: annular housing portion; 4: centrifugal guide portion; 11 : Power disk shaft hole; 12: power disk disk surface; 21: hammer blade screw; 31: first annular casing portion; 32: second annular casing portion; 41: straight section; 42: curved section; 43: arc Shape plate; 44: connecting plate; 5: stepped impeller; 6: seamless tube grinding parts; 61: grinding hammer; 62: seamless tube; 63: guide vane; 7: open end.

Detailed ways

Example one

1 and 2 are schematic structural diagrams of a cylindrical milling rotor of this embodiment, and the cylindrical milling rotor can achieve rapid classification. The power disc 1 of the cylindrical milling rotor in this embodiment is connected to the milling cylinder of FIG. 3 through threads. The milling cylinder of FIG. 4 is composed of three pieces of ring-shaped housing parts 3 and two sets of blade-shaped centrifugal guides. 4 are welded together, the centrifugal guide portions 4 are evenly distributed around the axis of the annular casing portion 3, and the uniformly distributed return channels are divided by the centrifugal guide portions 4 between the adjacent two annular casing portions 3, and the hammer blade 2 It is screwed to the centrifugal guide 3, the power disc 1 receives external power through the power shaft hole 11, and the classification impeller 5 is suspended in the grinding drum shown in FIG. 3 during installation.

The cylindrical grinding rotor provided in this embodiment realizes that after the material particles enter the classification zone, they are fully dispersed by the rotation of the cylindrical grinding rotor and the classification wheel, and then quickly participate in the classification. The strong centrifugal force of the coarse particles in the cylindrical rotor Quickly leave the classification area under the action, so that the airflow is unobstructed, which is conducive to the classification of fine particles with the airflow through the classification wheel. At the same time that rapid classification is achieved, the unobstructed airflow can timely remove the heat generated during the processing of the materials, so that The temperature can maintain a low temperature rise even without cooling facilities, which has obvious processing advantages for heat-sensitive materials such as sugar and oil.

The space between the outer periphery of the classification impeller 5 and the inner periphery of the grinding drum constitutes a classification region. The centrifugal guide portion 4 is in the shape of a blade and is uniformly distributed in the circumferential direction around the axis of the milling drum, so as to obtain the uniformly distributed backflow channels and make the coarse particles flow back evenly. The annular casing portion 3 includes an inner ring edge, and one end of the centrifugal guide portion 4 is flush with the edge of the inner ring, so as to reduce the disturbance of the rotating airflow around the classification impeller 5 and facilitate the sorting of the material particles. In addition, the centrifugal guide portion 4 between two adjacent ring-shaped housing portions 3 is deflected by a preset angle around the grinding tube axis in the opposite direction of the rotation of the grinding tube, which can reduce the selection. The air flow of the powder is disturbed to reduce the wind resistance load and prevent the material particles in the grinding area from penetrating into the classification area composed of the classification impeller 5 and the grinding drum.

The inner and outer diameters of the two annular casing portions 3 connected to the centrifugal guide portion 44 are equal, which makes the rotor structure simple and convenient for processing and manufacturing. The hammer blades 2 arranged on the outer periphery of the milling drum are spirally distributed around the axis of the milling drum, which is beneficial to enhancing the grinding and conveying of materials and reducing the situation of powder agglomeration.

In one embodiment, the grinding drum and the hammer blade 2 are installed on one side of the power disc 1. This structure further expands the spatial distribution of the hammer blade 2, the overall load distribution is more uniform, and it is more stable during high-speed rotation.

The centrifugal guide portion 4 plays a role of guiding and recirculating the material. The annular shell portion 3 is distributed along the axial direction of the grinding tube, and the centrifugal guide portion 4 is arranged on the annular shell portion in the circumferential direction of the grinding tube. 3, there is a gap between the ring-shaped housing parts 3, which communicates the inside and outside of the milling drum, and the gap forms a return channel for coarse particles; during installation, the hammer knife 2 and the outer periphery of the milling drum are installed. The outer ring gear forms the grinding area, so that the material particles are ground and transported in the extended grinding area.

During operation, the cylindrical grinding rotor rotates at high speed, and the material is ground in the grinding area composed of the hammer blade 2 and the ring gear. The open end 7 of the cylindrical grinding rotor enters the barrel of the grinding cylinder, and is classified by the impeller 5 The coarse particles after being sorted are captured by the powerful centrifugal place of the grinding drum, and are returned to the grinding area outside the grinding drum for recirculation through the recirculation channel formed by the annular shell part 3 and the centrifugal guide part 4. The crushing achieves the rapid classification conditions that the material particles quickly participate in the classification once dispersed, and then quickly leave the classification zone. While improving the classification efficiency, the classification accuracy of the powder is greatly improved, and the number of residual coarse particles in the powder is reduced by one million. Index of fractions.

The centrifugal field formed by the high-speed rotation of the cylindrical milling rotor is extremely powerful. For example, when a φ250mm horizontal rotor is rotated at a speed of 2450r / min, the centrifugal acceleration generated is more than 1,000 times the acceleration of gravity, and the powerful centrifugal force is quickly separated. The coarse-grained materials in the classification zone also have a strong centrifugal acceleration of the coarse-grained materials. They are projected at a very high speed toward the materials and ring gear in the grinding zone. The collision and impact formed significantly improve the grinding effect.

12 and 13 are structural diagrams of the power disk 1. FIG. 14 is a structural diagram of a horn-shaped centrifugal guide 4; FIG. 15 is a cross-sectional view of the horn-shaped centrifugal guide 4; and FIG. 17 is a structure of a cylindrical grinding rotor schematic diagram.

The centrifugal guide portion 4 in this embodiment is provided with a horn-shaped housing structure. This structure can smoothly change the return direction of coarse particles, which is beneficial to reducing the resistance of the coarse particles to reflow, and at the same time, it can simplify the manufacturing process during the assembly of the grinding tube. .

This embodiment also provides a working method of a cylindrical grinding rotor. The method is implemented by using the above-mentioned cylindrical grinding rotor. As shown in FIG. 21, the method includes:

In S10, the classification impeller is suspended in the milling drum, so that a space between the outer periphery of the classification impeller and the inner periphery of the milling cylinder constitutes a classification zone;

In S20, the cylindrical milling rotor is activated so that the material particles enter the classification zone from the open end of the cylindrical milling rotor; and

In S30, the cylindrical grinding rotor is driven to rotate at a high speed to form a powerful centrifugal field, so that coarse particles entering the classification zone are separated by the classification impeller, wherein once the coarse particles are close to the classification impeller, they are used by the cylindrical grinding rotor. Captured by a powerful centrifugal field and returned to the outside of the mill drum through the return channel.

The cylindrical milling rotor provided in this embodiment can quickly classify, and expand the distribution of the hammer blade 2 along the axial direction of the milling cylinder, so that the material is ground, scattered and transported in the expanded milling area, which increases the grinding. The crushed effective space improves the milling efficiency; the coarse particles entering the classification zone composed of the grinding drum and the classification impeller 5 and the coarse particles separated by the classification impeller 5 can be quickly and efficiently returned to the mill through the cylindrical grinding rotor The powder area eliminates the problems of slow circulation of coarse particles, poor airflow and low classification efficiency.

Example two

Based on the first embodiment, the cylindrical milling rotor of this embodiment is shown in Figs. 4 and 5. In this embodiment, the milling cylinder is composed of three first annular shells with positioning bosses. Body 31, three second ring-shaped housing portions 32 with positioning recesses, three groups of centrifugal guides 4, hammer blade screw 21; the first side of each group of centrifugal guides and the first ring-shaped housing The part 31 is welded and fixed, the second side of each group of centrifugal guides is welded and fixed to the second annular housing part 32, and the hammer blade is connected with the grinding drum through the hammer blade screw 21. The first first ring-shaped housing portion 31 and the second ring-shaped housing portion 32 are provided with a positioning function, which is convenient for rotor manufacturing, replacement, and maintenance.

FIG. 6 and FIG. 7 are schematic diagrams of the combined structure of the first annular casing portion 31 and the second annular casing portion 32 of this embodiment, and FIG. 8 is a schematic diagram of the structure of a hammer knife provided in this embodiment. The cross-sectional profile of the centrifugal guide 4 is surrounded by a straight section 41, a curved section 42 and a transition line. The centrifugal guide 4 formed by this cross-section profile is beneficial to eliminate the free edging of the edges caused by the high-speed rotation of the classification impeller 5 in the classification zone. It is beneficial to the rapid capture and efficient separation of coarse particles in the classification zone. In addition, the centrifugal guide 4 of the above structure can reduce the disturbance of the air flow in the classification zone, which is beneficial to the backflow of coarse particles and accelerates the circulation.

For the working method and function of the cylindrical milling rotor in this embodiment, refer to Implementation 1, which will not be repeated one by one here.

Example three

On the basis of the first embodiment and the second embodiment, the structure of the cylindrical milling rotor of this embodiment is shown in FIG. 9 and FIG. 10, and the side of the power disk plate surface 12 in this embodiment is equipped with milling powder. Tube and the seamless tube grinding part 6 composed of grinding hammer 61, seamless tube 62, and material guide vane 63 shown in FIG. 16, this structure further expands the space distribution of the hammer blade, and the overall load distribution is more uniform. More stable when rotating at high speed.

11 is a schematic structural diagram of a combination of a first annular casing portion 31, a second annular casing portion 32, a centrifugal guide portion 4, and a hammer blade 2. Among them, the first annular casing portion 31 and the second annular casing For specific structures and functions of the body portion 32, the centrifugal guide portion 4, and the hammer blade 2, reference may be made to the first embodiment and the second embodiment, and details are not described herein again.

For the working method and function of the cylindrical milling rotor in this embodiment, refer to Implementation 1, which will not be repeated one by one here.

Example 4

Based on the first embodiment, the second embodiment, and the third embodiment, this embodiment provides a cylindrical milling rotor. As shown in FIG. 18 to FIG. 20, the power of the cylindrical milling rotor in this embodiment is The disc 1 is connected to the milling drum of FIG. 3 by threads. The milling drum includes at least two annular casing portions 3 and a plurality of centrifugal guide portions 4. The at least two annular casing portions 3 are coaxially distributed. The plurality of centrifugal guide portions 4 are provided along the circumferential direction of the annular case portion 3 and are located between two adjacent annular case portions 3, and the two adjacent annular case portions 3 There is a gap between 3 to connect the inside and outside of the milling drum and form a return channel for coarse particles.

The centrifugal guide 4 in this embodiment includes an arc-shaped plate 43 and a connection plate 44 connected to the arc-shaped plate 43. The connection plate 44 is located in the middle of the arc-shaped plate 43 and has a non-zero angle with one end of the arc-shaped plate 43. So that the centrifugal guide 4 has a Y-shaped structure. The centrifugal guide portion 4 is connected between two adjacent ring-shaped housing portions 3 through a rotation shaft, so that the centrifugal guide portion 4 can rotate around the rotation shaft. Since the centrifugal guide portion 4 can rotate, the coarse particles can be dredged out of the powder selection area better, and especially for sugary and oily materials that are easy to adhere and agglomerate, it can achieve a better separation effect.

In this embodiment, the curved surface of the arc-shaped plate 43 has a guiding effect on the return of coarse-grained materials.

In one embodiment, the centrifugal guide portion 4 is fixedly connected to two adjacent ring-shaped casing portions 3, so that the centrifugal guide portion 4 is fixed between the two adjacent ring-shaped casing portions 3.

In this embodiment, the hammer blade 2 has an L-shaped structure and includes a first connection portion 21 and a second connection portion 22 connected to the first connection portion 21. The first connection portion 21 is connected to the first side of the connection plate 44, and the second The connection portion 22 is connected to the second side surface of the connection plate 44, and the first side surface and the second side surface are two adjacent side surfaces of the connection plate 44. The hammer blade 2 further includes a blade 23 provided at a connection between the first connection portion 21 and the second connection portion 22. In one embodiment, the second side of the connecting plate 44 is the top surface of the connecting plate 44, and the second connecting portion 22 is connected to the top surface of the connecting plate 44. In this embodiment, a blade is provided on the second connecting portion 22. 221, the blade 23 is attached to one side of the blade 221. When the centrifugal guide portion 4 is installed between two adjacent ring-shaped housing portions 3, the blade 221 and the blade 23 are located on the outer periphery of the grinding drum, and form a grinding area with the outer ring gear, so that the material particles are expanded. The milling area is ground and transported.

This embodiment also provides a working method of the cylindrical grinding rotor. This method refers to the working method and function of the cylindrical grinding rotor in the first embodiment, which is not described in this embodiment.

Example 5

This embodiment provides a cylindrical grinding rotor. Based on Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, the grinding barrel of the cylindrical grinding rotor adopts a variable diameter structure. In this embodiment, the inner diameters and outer diameters of two adjacent ring-shaped housing portions 3 are not equal. Such a reduced-diameter outer shape structure of the grinding tube may cause the two adjacent housing portions to flow through the adjacent two. The air pressure and flow velocity of the air flow in the return channel of the annular shell portion 3 change, thereby causing the air flow to change at a lower Reynolds number and form turbulence, thereby destroying the agglomeration of the micro-nano powder, which is beneficial to the powder. Dispersion and transportation, reduce the "reverse crushing" phenomenon caused by powder agglomeration. In addition, due to the different inner diameters between the adjacent ring-shaped housing parts 3, the inner diameter of the milling drum changes, and the change of the inner diameter forms the shape of the inner diameter of the milling rotor, which can adapt to the different shapes of the classifying impeller 5, thereby forming a uniform gap. The powder selection zone is conducive to eliminating the close-range free vortex formed by the rotation of the classification impeller 5 and improving the classification efficiency and classification accuracy.

For other structures of the cylindrical milling rotor in this embodiment, refer to the structures of other components in the first embodiment, the second embodiment, and the third embodiment, and details are not repeated here.

This embodiment also provides a working method of the cylindrical grinding rotor. This method refers to the working method and function of the cylindrical grinding rotor in the first embodiment, which is not described in this embodiment.

Claims (15)

A cylindrical milling rotor includes: Power plate Hammer knife; and The cylindrical grinding powder cylinder connected to the power disc, the hammer blades are distributed on the outer periphery of the grinding cylinder, the grinding cylinder includes at least two annular casing portions and a plurality of centrifugal guide portions, so The at least two annular casing portions are coaxially distributed, the plurality of centrifugal guide portions, the annular casing portions are circumferentially disposed, and are located between two adjacent annular casing portions, adjacent to each other. There is a gap between the two ring-shaped shell parts to connect the inside and the outside of the milling drum and form a coarse particle return channel. The cylindrical milling rotor according to claim 1, wherein the centrifugal guide portion is in the shape of a blade and is uniformly distributed in a circumferential direction with an axis of the milling cylinder as a center. The cylindrical milling rotor according to claim 1, wherein the annular housing portion includes an inner ring edge, and one end of the centrifugal guide portion is flush with the inner ring edge. The cylindrical milling rotor according to claim 3, wherein the centrifugal guide portion between two adjacent ring-shaped casing portions rotates along the milling cylinder axis along the milling cylinder. Deflects the preset angle in the opposite direction. The cylindrical milling rotor according to claim 4, wherein a profile of a cross section of the centrifugal guide along a direction perpendicular to an axis of the milling cylinder includes a straight line segment and a curved segment. The cylindrical milling rotor according to claim 1, wherein the centrifugal guide is a horn-shaped housing. The cylindrical milling rotor according to claim 1, wherein an inner diameter and an outer diameter of the two annular casing portions connected to the centrifugal guide portion are equal. The cylindrical milling rotor according to claim 1, wherein the ring-shaped housing portion includes a first ring-shaped housing portion and a second ring-shaped housing portion provided to have a positioning function. The cylindrical milling rotor according to claim 1, wherein the hammer blades are spirally distributed around an axis of the milling cylinder. The cylindrical milling rotor according to claim 1, wherein the power disk includes a disk surface, and the milling cylinder and the hammer blade are mounted on one side of the disk surface, or the cylindrical milling rotor includes a The seamless tube grinding part on one side of the power disk disk surface is described. The cylindrical milling rotor according to claim 1, further comprising a classifying impeller, the classifying impeller is suspended in the milling tube, and an outer periphery of the classifying impeller and an inner periphery of the milling tube Empty constitutes a grading area. The cylindrical milling rotor according to claim 1, wherein the centrifugal guide portion is a Y-shaped structure and includes an arc-shaped plate and a connection plate, the connection plate is connected to a middle portion of the arc-shaped plate, and is connected to the center portion of the arc-shaped plate. One end of the arc-shaped plate is at a non-zero included angle. The cylindrical milling rotor according to claim 12, wherein the hammer blade has an L-shaped structure and includes a first connection portion and a second connection portion connected to the first connection portion, and the first connection portion The second connection portion is connected to a side surface of the connection plate, and the second connection portion is connected to a top surface of the connection plate. The cylindrical milling rotor according to claim 13, wherein the hammer blade further comprises a blade provided at a connection between the first connection portion and the second connection portion, and the second connection portion A blade is provided, and the blade is attached to one side of the blade. A working method of a cylindrical milling rotor, which is implemented by using any of the cylindrical milling rotors as claimed in claims 1-10, and the method comprises: Suspending the classifying impeller in the milling drum, so that the space between the outer periphery of the classifying impeller and the inner periphery of the milling drum constitutes a classifying zone; Activating the cylindrical grinding rotor so that material particles enter the classification zone from the open end of the cylindrical grinding rotor; and The cylindrical milling rotor is driven to rotate at a high speed to form a powerful centrifugal field, so that coarse particles entering the classification zone are separated by the classification impeller, wherein when the coarse particles are close to the cylindrical milling rotor, the The cylindrical milling rotor is captured by the powerful centrifugal field and returned to the outside of the milling cylinder through the return channel.

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