Dynamic powder selecting device of efficient cement grinding machine

Abstract

The invention discloses a dynamic powder selecting device of an efficient cement pulverizing mill, and relates to the technical field of cement powder selecting, the dynamic powder selecting device of the efficient cement pulverizing mill comprises a machine body, a sorting cavity is formed in the machine body, a plurality of conveying grooves are formed in the side wall of the machine body, one end of each conveying groove communicates with the sorting cavity, and the other end of each conveying groove communicates with the cement pulverizing mill. The bottom of the machine body is provided with an output port, the top of the sorting cavity is provided with a collecting cavity, the collecting cavity is communicated with the sorting cavity, the cement grinding machine grinds cement blocks, then powder generated by grinding is conveyed to the conveying groove, and the powder is conveyed to the sorting cavity through the conveying groove. After powder is input into the separation cavity, the powder is subjected to separation treatment in the separation cavity, the powder meeting the condition is conveyed to the side close to the collection cavity, and the powder with the large size in the powder is conveyed to the output port and conveyed into the cement pulverizer again through the output port to be subjected to crushing treatment.

Description

Technical Field

[0001] The invention relates to the technical field of cement powder selection, in particular to a dynamic powder selection device for a high-efficiency cement grinding mill. Background Art

[0002] Cement is one of the basic raw materials used in modern construction projects. Cement needs to be ground to a specified particle size before it can be used during the production process. However, during the grinding process, if the cement powder that has reached the standard particle size is not separated in time, it will seriously affect the grinding efficiency. Therefore, powder selection equipment is needed to select the cement powder in real time during grinding, so as to ensure that the cement powder that has reached the standard is separated, and the cement powder that has not reached the standard is sent back to the grinding equipment for further grinding; The existing powder selection device is difficult to effectively disperse the cement powder evenly during the feeding process, and usually adopts screening to sort and filter the powder. During the screening process, powder that meets the sorting conditions may be transported to the cement grinder again along with the fragments for grinding, resulting in low sorting efficiency. Summary of the invention

[0003] The object of the present invention is to provide a dynamic powder selection device for an efficient cement grinding mill to solve the problems raised in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: A dynamic powder selection device for a high-efficiency cement grinder comprises a machine body, a sorting chamber is arranged inside the machine body, a plurality of conveying troughs are arranged on the side walls of the machine body, the plurality of conveying troughs are arranged around the axis of the machine body, one end of the conveying trough is connected to the sorting chamber, the other end of the conveying trough is connected to the cement grinder, an output port is arranged at the bottom of the machine body, a collecting chamber is arranged at the top of the sorting chamber, and the collecting chamber is connected to the sorting chamber.

[0005] The cement grinder grinds the cement blocks, and then the powder produced by the grinding is transported to the conveying trough, and then to the sorting chamber. After the powder is input into the sorting chamber, the powder is sorted in the sorting chamber, and the powder that meets the conditions is transported to the side close to the collecting chamber, while the powder with a larger volume is transported to the output port, and then transported to the cement grinder again through the output port for crushing.

[0006] Preferably, a rough selection port is provided at the bottom of the conveying trough, a plurality of sorting plates are provided in the rough selection port, the plurality of sorting plates are equidistantly arranged along the side of the rough selection port, and the bottom of the rough selection port is connected to the output port.

[0007] Preferably, a rotating ring is provided in the sorting chamber, a gear ring is provided on the side of the rotating ring close to the sorting chamber, a No. 1 motor is provided in the inner wall of the sorting chamber, a gear is provided on the driving shaft of the No. 1 motor, the gear is meshed with the gear ring, a plurality of baffles are provided on the side of the rotating ring close to the conveying groove, the plurality of baffles are arranged around the axis of the rotating ring, and the rotating ring and the baffles are both rotatably connected to the sorting chamber.

[0008] Preferably, a plurality of support frames are provided on the inner wall of the rotating ring, a power column is provided at one end of the support frame away from the rotating ring, a No. 2 motor is provided in the power column, a rotating shaft is provided on the side of the driving shaft of the No. 2 motor away from the collecting chamber, a plurality of fan blades are provided on the rotating shaft, and the plurality of fan blades are arranged around the axis of the rotating shaft, the top length of the fan blade is greater than the bottom length of the fan blade, and the rotation direction of the No. 1 motor is the same as the rotation direction of the No. 2 motor.

[0009] Preferably, a connecting tube is provided between the sorting chamber and the collecting chamber, the diameter of the connecting tube is smaller than the diameters of the sorting chamber and the collecting chamber, a depression is provided inside the collecting chamber, a plurality of triangular blocks are provided inside the depression, and the plurality of triangular blocks are arranged around the axis of the collecting chamber, an output chamber is provided outside the connecting tube, a plurality of connecting ports are provided at the top of the output chamber, the connecting ports are provided between two adjacent triangular blocks, the output chamber is connected with the collecting chamber through the connecting ports, a plurality of dust ports are provided at the bottom of the output chamber, and the dust ports are provided between two adjacent conveying troughs.

[0010] Preferably, a grinding chamber is provided at the bottom of the sorting chamber, a grinding column is provided in the grinding chamber, an electromagnetic coil is provided in the side wall of the grinding chamber, a magnet is provided inside the grinding column, grinding patterns are provided on the side and bottom of the grinding column, and grinding patterns are also provided on the inner wall of the grinding chamber.

[0011] Preferably, an air pipe is provided in the center of the grinding column, a plurality of air passages are provided on the side wall of the machine body, an air pump is provided at the bottom of the grinding column, one end of the air pump is connected to the air pipe, and the other end of the air pump is connected to the air passage, and an auger is provided on the side of the air pipe close to the grinding chamber.

[0012] Preferably, the distance between two adjacent sorting plates is greater than the distance between two adjacent baffles.

[0013] Preferably, the distance between two adjacent baffles is greater than the distance between two adjacent fan blades.

[0014] Before the powder crushed by the cement grinding mill moves to the side close to the sorting chamber through the conveying trough, the controller controls the No. 1 motor to start, and the driving shaft of the No. 1 motor drives the gear to rotate. When the gear rotates, it meshes with the gear ring on the outer wall of the rotating ring, thereby driving the rotating ring to rotate. When the rotating ring rotates, it drives several baffles to rotate. When the powder moves to the junction of the conveying trough and the sorting chamber, since the distance between two adjacent sorting plates is greater than the distance between two adjacent baffles, the large-volume fragments contained in the powder cannot pass through the gap between the two adjacent baffles, and are thus blocked outside the sorting chamber, while the large-volume fragments move to the side close to the rough selection port, fall through the gap between the two adjacent sorting plates, and are finally output through the output port, and return to the cement grinding mill for crushing again, thereby completing the first sorting; Before the powder that has undergone the first sorting enters the sorting chamber, the controller controls the No. 2 motor to start, and the driving shaft of the No. 2 motor drives the rotating shaft to rotate, and when the rotating shaft rotates, it drives several fan blades to rotate. When the fan blades rotate, a large amount of airflow movement will be generated, and then when the conveying trough conveys the powder to the sorting chamber, a part of the powder will float under the movement of the airflow, and the powder will be transported with the movement of the airflow; when the powder with a volume smaller than the distance between two adjacent baffles enters the sorting chamber, because the top length of the fan blade is greater than the bottom length of the fan blade, the powder will be sorted again between the fan blade and the baffle, and the gravity of the larger debris itself is greater than the thrust generated by the fan blade, and then the larger debris will fall to the side close to the grinding chamber; When the larger debris is transported to the grinding chamber, the controller controls the electromagnetic coil inside the grinding chamber to be energized. After the electromagnetic coil is energized, a magnetic force is generated. Since a magnet is arranged in the grinding column, the magnetic force attracts the magnet, thereby driving the grinding column to rotate around the axis of the machine body, so that when the larger debris enters the gap between the grinding chamber and the grinding column, the larger debris is ground into powder under the cooperation of the grinding chamber and the grinding column. The ground powder is then transported to the side close to the auger, so that the auger transports the powder from the bottom of the grinding column to the top of the grinding column. At the same time, the controller controls the air pump to start, and the air pump draws the outside air through the airway, and then transports it to the air pipe through the air pump. When the gas is output from the end of the air pipe away from the air pump, the powder accumulates on the top of the grinding column, and the air pipe transports gas to the inside of the sorting chamber, so that the airflow generated by the gas will drive the powder on the top of the grinding column to float, and the powder will move to the sorting chamber along the airflow; The rotation direction of the No. 1 motor is the same as that of the No. 2 motor, and the power column is connected to the rotating ring through the support frame, so that during the rotation of the rotating ring, the rotating ring drives the power column to rotate through the support frame, and during the rotation of the power column, the No. 2 motor also drives the fan blades to rotate, so that the rotational power of the No. 2 motor is superimposed on the rotational power of the No. 1 motor and acts on the fan blades, so that the airflow generated by the fan blades is accelerated, and the airflow drives the powder to move faster. The airflow generated by the fan blades and the airflow generated by the air pump output cooperate with each other to drive the powder to move quickly to the collection chamber. In the process of the powder moving to the collection chamber, the powder will pass through the connecting tube. Since the diameter of the connecting tube is smaller than the diameters of the sorting chamber and the collection chamber, the flow rate of the powder in the connecting tube is accelerated, so that the powder quickly reaches the collection chamber, thereby improving the efficiency of powder sorting; As the diameter of the collecting chamber increases, the movement speed of the powder in the collecting chamber decreases, and the powder rotates around the axis of the collecting chamber under the action of the airflow. When the powder moves to the depression at the edge of the collecting chamber, and a number of triangular blocks are arranged in the depression, the powder will be blocked by the triangular blocks, and the powder will accumulate between two adjacent triangular blocks, and a part of the airflow will move to the output chamber through the connecting port, so that the airflow drives the powder to be transported through the connecting port when moving, so that the powder is transported to the output chamber, and finally output to the outside through the dust port.

[0015] Compared with the prior art, the present invention has the following beneficial effects: When the rotating ring rotates, the power column is driven to rotate, so that the power column drives the fan blades to rotate. At this time, the rotation speed of the fan blades is the same as the rotation speed of the rotating ring. When the controller controls the No. 2 motor to drive the fan blades, the fan blades are driven by the rotating ring and the rotation speed output by the No. 2 motor is superimposed, so that the rotation speed of the fan blades is increased, and the airflow generated by the fan blades is accelerated, so that the powder is transported faster, the efficiency of powder sorting is improved, and the sorting time is saved. The gravity of heavier debris is greater than the airflow thrust generated by the fan blades, and the debris falls into the grinding chamber for grinding, so that the debris does not need to be transported to the cement grinder for crushing, the efficiency of debris crushing is accelerated as much as possible, and the time of debris transportation is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is an internal front view of the present invention; Figure 4 It is a schematic diagram of the structure of the roughing port and the sorting cavity; Figure 5 for Figure 3The enlarged view of point A in the middle; Figure 6 It is a schematic diagram of the structure of the rotating ring and the baffle; Figure 7 The bottom view of the baffle and the fan blades; Figure 8 is a schematic diagram of the internal structure of the collection chamber; Fig. 9 is an internal front view of the collection chamber; In the figure: 1. body; 11. sorting chamber; 12. conveying trough; 13. output port; 14. collecting chamber; 141. depression; 142. triangular block; 15. rough selection port; 151. sorting plate; 16. rotating ring; 161. power column; 17. baffle; 18. fan blade; 19. connecting pipe; 20. output chamber; 201. connecting port; 202. dust port; 21. grinding chamber; 22. grinding column; 23. air pipe; 24. auger. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0018] Example: Figure 1-Figure 9 As shown, the present invention provides a dynamic powder selection device for a high-efficiency cement grinder, comprising a body 1, wherein a sorting chamber 11 is arranged inside the body 1, and a plurality of conveying troughs 12 are arranged on the side wall of the body 1, and the plurality of conveying troughs 12 are arranged around the axis of the body 1, one end of the conveying trough 12 is connected to the sorting chamber 11, and the other end of the conveying trough 12 is connected to the cement grinder, an output port 13 is arranged at the bottom of the body 1, and a collecting chamber 14 is arranged at the top of the sorting chamber 11, and the collecting chamber 14 is connected to the sorting chamber 11.

[0019] As a specific embodiment of the present invention, a rough selection port 15 is provided at the bottom of the conveying trough 12, and a plurality of sorting plates 151 are provided in the rough selection port 15. The plurality of sorting plates 151 are arranged equidistantly along the side of the rough selection port 15, and the bottom of the rough selection port 15 is connected to the output port 13.

[0020] As a specific embodiment of the present invention, a rotating ring 16 is arranged in the sorting chamber 11, a gear ring is arranged on the side of the rotating ring 16 close to the sorting chamber 11, a No. 1 motor is arranged in the inner wall of the sorting chamber 11, a gear is arranged on the driving shaft of the No. 1 motor, the gear is meshed with the gear ring, and a plurality of baffles 17 are arranged on the side of the rotating ring 16 close to the conveying trough 12, and the plurality of baffles 17 are arranged around the axis of the rotating ring 16, and the rotating ring 16 and the baffles 17 are both rotatably connected to the sorting chamber 11.

[0021] As a specific embodiment of the present invention, a plurality of support frames are arranged on the inner wall of the rotating ring 16, a power column 161 is arranged at one end of the support frame away from the rotating ring 16, a No. 2 motor is arranged in the power column 161, a rotating shaft is arranged on the side of the driving shaft of the No. 2 motor away from the collecting chamber 14, a plurality of fan blades 18 are arranged on the rotating shaft, a plurality of the fan blades 18 are arranged around the axis of the rotating shaft, a top length of the fan blade 18 is greater than a bottom length of the fan blade 18, and the rotation direction of the No. 1 motor is the same as that of the No. 2 motor.

[0022] As a specific embodiment of the present invention, a connecting pipe 19 is arranged between the sorting chamber 11 and the collecting chamber 14, and the diameter of the connecting pipe 19 is smaller than the diameters of the sorting chamber 11 and the collecting chamber 14. A recess 141 is arranged inside the collecting chamber 14, and a plurality of triangular blocks 142 are arranged in the recess 141. The plurality of triangular blocks 142 are arranged around the axis of the collecting chamber 14. An output chamber 20 is arranged outside the connecting pipe 19, and a plurality of connecting ports 201 are arranged at the top of the output chamber 20, and the connecting ports 201 are arranged between two adjacent triangular blocks 142. The output chamber 20 is connected with the collecting chamber 14 through the connecting ports 201, and a plurality of dust ports 202 are arranged at the bottom of the output chamber 20, and the dust ports 202 are arranged between two adjacent conveying troughs 12.

[0023] As a specific embodiment of the present invention, a grinding chamber 21 is provided at the bottom of the sorting chamber 11, a grinding column 22 is provided in the grinding chamber 21, an electromagnetic coil is provided in the side wall of the grinding chamber 21, a magnet is provided inside the grinding column 22, grinding patterns are provided on the side and bottom of the grinding column 22, and grinding patterns are also provided on the inner wall of the grinding chamber 21.

[0024] As a specific embodiment of the present invention, an air pipe 23 is arranged at the center of the grinding column 22, and a plurality of air passages are arranged on the side wall of the body 1. An air pump is arranged at the bottom of the grinding column 22, one end of the air pump is connected to the air pipe 23, and the other end of the air pump is connected to the air passage. An auger 24 is arranged on the side of the air pipe 23 close to the grinding chamber 21.

[0025] As a specific implementation of the present invention, the distance between two adjacent sorting plates 151 is greater than the distance between two adjacent baffles 17 .

[0026] As a specific implementation of the present invention, the distance between two adjacent baffles 17 is greater than the distance between two adjacent blades 18 .

[0027] Working principle of the present invention: Before the powder crushed by the cement grinding mill moves to the side close to the sorting chamber 11 through the conveying trough 12, the controller controls the No. 1 motor to start, and the driving shaft of the No. 1 motor drives the gear to rotate. When the gear rotates, it meshes with the gear ring on the outer wall of the rotating ring 16, thereby driving the rotating ring 16 to rotate. When the rotating ring 16 rotates, it drives a plurality of baffles 17 to rotate. When the powder moves to the junction of the conveying trough 12 and the sorting chamber 11, since the distance between two adjacent sorting plates 151 is greater than the distance between two adjacent baffles 17, the large-volume fragments contained in the powder cannot pass through the gap between the two adjacent baffles 17, and are thus blocked outside the sorting chamber 11, while the large-volume fragments move to the side close to the rough selection port 15, and fall through the gap between the two adjacent sorting plates 151, and are finally output through the output port 13, and return to the cement grinding mill for crushing again, thereby completing the first sorting; Before the powder that has undergone the first sorting enters the sorting chamber 11, the controller controls the No. 2 motor to start, and the driving shaft of the No. 2 motor drives the rotating shaft to rotate, and when the rotating shaft rotates, it drives several blades 18 to rotate. When the blades 18 rotate, a large amount of airflow movement will be generated, and then when the conveying trough 12 conveys the powder to the sorting chamber 11, a part of the powder will float under the movement of the airflow, and the powder will be transported with the movement of the airflow; when the powder with a volume smaller than the distance between two adjacent baffles 17 enters the sorting chamber 11, because the top length of the blade 18 is greater than the bottom length of the blade 18, the powder will be sorted again between the blade 18 and the baffle 17, and the gravity of the larger debris itself is greater than the thrust generated by the blade 18, and then the larger debris will fall to the side close to the grinding chamber 21; When the larger debris is transported to the grinding chamber 21, the controller controls the electromagnetic coil inside the grinding chamber 21 to be energized. After the electromagnetic coil is energized, a magnetic force is generated. Since a magnet is arranged in the grinding column 22, the magnetic force attracts the magnet, thereby driving the grinding column 22 to rotate around the axis of the machine body 1. When the larger debris enters the gap between the grinding chamber 21 and the grinding column 22, the larger debris is ground into powder under the cooperation of the grinding chamber 21 and the grinding column 22. The ground powder is then moved to the position close to the auger 24. One-side conveying makes the auger 24 convey the powder from the bottom of the grinding column 22 to the top of the grinding column 22. At the same time, the controller controls the air pump to start. The air pump draws air from the outside through the airway and then conveys it to the air delivery pipe 23 through the air pump. When the gas is output from the end of the air delivery pipe 23 away from the air pump, the powder accumulates on the top of the grinding column 22, and the air delivery pipe 23 conveys gas to the inside of the sorting chamber 11, so that the airflow generated by the gas will drive the powder on the top of the grinding column 22 to float, and the powder will move to the sorting chamber 11 along the airflow; The rotation direction of the No. 1 motor is the same as that of the No. 2 motor, and the power column 161 is connected to the rotating ring 16 through the support frame, so that during the rotation of the rotating ring 16, the rotating ring 16 drives the power column 161 to rotate through the support frame, and during the rotation of the power column 161, the No. 2 motor also drives the fan blade 18 to rotate, so that the rotational power of the No. 2 motor is superimposed on the rotational power of the No. 1 motor and acts on the fan blade 18, so that the airflow generated by the fan blade 18 is accelerated, and the airflow drives the powder to move faster. The airflow generated by the fan blade 18 cooperates with the airflow generated by the air pump output to drive the powder to move quickly toward the collecting chamber 14. In the process of the powder moving toward the collecting chamber 14, the powder will pass through the connecting tube 19. Since the diameter of the connecting tube 19 is smaller than the diameters of the sorting chamber 11 and the collecting chamber 14, the flow rate of the powder in the connecting tube 19 is accelerated, so that the powder quickly reaches the collecting chamber 14, thereby improving the efficiency of powder sorting; As the diameter of the collecting chamber 14 increases, the movement speed of the powder in the collecting chamber 14 decreases, and the powder rotates around the axis of the collecting chamber 14 under the action of the airflow. When the powder moves to the depression 141 at the edge of the collecting chamber 14, and a plurality of triangular blocks 142 are arranged in the depression 141, the powder will be blocked by the triangular blocks 142, and the powder will accumulate between two adjacent triangular blocks 142, and a part of the airflow will move to the output chamber 20 through the connecting port 201, so that the airflow drives the powder to be transported through the connecting port 201 when moving, so that the powder is transported to the output chamber 20, and finally output to the outside through the dust port 202.

[0028] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A dynamic powder selection device for an efficient cement grinding mill, characterized in that: The invention comprises a machine body (1), wherein a sorting chamber (11) is arranged inside the machine body (1), and a plurality of conveying grooves (12) are arranged on the side wall of the machine body (1), wherein the plurality of conveying grooves (12) are arranged around the axis of the machine body (1), wherein one end of the conveying groove (12) is connected to the sorting chamber (11), and the other end of the conveying groove (12) is connected to a cement grinding machine, wherein an output port (13) is arranged at the bottom of the machine body (1), and a collecting chamber (14) is arranged at the top of the sorting chamber (11), and the collecting chamber (14) is connected to the sorting chamber (11).

2. The dynamic powder selection device for a high-efficiency cement grinding mill according to claim 1 is characterized in that: A rough selection port (15) is provided at the bottom of the conveying trough (12), and a plurality of sorting plates (151) are provided in the rough selection port (15). The plurality of sorting plates (151) are arranged equidistantly along the side of the rough selection port (15), and the bottom of the rough selection port (15) is connected to the output port (13).

3. The dynamic powder selection device of a high-efficiency cement grinding mill according to claim 2 is characterized in that: A rotating ring (16) is arranged in the sorting chamber (11), a gear ring is arranged on a side of the rotating ring (16) close to the sorting chamber (11), a No. 1 motor is arranged in the inner wall of the sorting chamber (11), a gear is arranged on the driving shaft of the No. 1 motor, the gear is meshed with the gear ring, a plurality of baffles (17) are arranged on a side of the rotating ring (16) close to the conveying trough (12), the plurality of baffles (17) are arranged around the axis of the rotating ring (16), and the rotating ring (16) and the baffles (17) are both rotatably connected to the sorting chamber (11).

4. The dynamic powder selection device for a high-efficiency cement grinding mill according to claim 3 is characterized in that: A plurality of support frames are arranged on the inner wall of the rotating ring (16), a power column (161) is arranged at one end of the support frame away from the rotating ring (16), a No. 2 motor is arranged in the power column (161), a rotating shaft is arranged on the side of the driving shaft of the No. 2 motor away from the collecting chamber (14), a plurality of fan blades (18) are arranged on the rotating shaft, the plurality of fan blades (18) are arranged around the axis of the rotating shaft, the top length of the fan blade (18) is greater than the bottom length of the fan blade (18), and the rotation direction of the No. 1 motor is the same as the rotation direction of the No. 2 motor.

5. The dynamic powder selection device for a high-efficiency cement grinding mill according to claim 1 is characterized in that: A connecting pipe (19) is provided between the sorting chamber (11) and the collecting chamber (14); the diameter of the connecting pipe (19) is smaller than the diameters of the sorting chamber (11) and the collecting chamber (14); a recess (141) is provided inside the collecting chamber (14); a plurality of triangular blocks (142) are provided inside the recess (141); the plurality of triangular blocks (142) are arranged around the axis of the collecting chamber (14); an output chamber (20) is provided outside the connecting pipe (19); a plurality of connecting ports (201) are provided at the top of the output chamber (20); the connecting ports (201) are arranged between two adjacent triangular blocks (142); the output chamber (20) is connected to the collecting chamber (14) through the connecting ports (201); a plurality of dust ports (202) are provided at the bottom of the output chamber (20); the dust ports (202) are arranged between two adjacent conveying troughs (12).

6. The dynamic powder selection device of a high-efficiency cement grinding mill according to claim 1, characterized in that: A grinding chamber (21) is arranged at the bottom of the sorting chamber (11), a grinding column (22) is arranged in the grinding chamber (21), an electromagnetic coil is arranged in the side wall of the grinding chamber (21), a magnet is arranged inside the grinding column (22), grinding patterns are arranged on the side and bottom of the grinding column (22), and grinding patterns are also arranged on the inner wall of the grinding chamber (21).

7. The dynamic powder selection device for a high-efficiency cement grinding mill according to claim 6 is characterized in that: An air pipe (23) is arranged at the center of the grinding column (22), and a plurality of air passages are also arranged on the side wall of the machine body (1). An air pump is arranged at the bottom of the grinding column (22), one end of the air pump is connected to the air pipe (23), and the other end of the air pump is connected to the air passage. An auger (24) is arranged on the side of the air pipe (23) close to the grinding chamber (21).

8. The dynamic powder selection device for a high-efficiency cement grinding mill according to claim 3 is characterized in that: The distance between two adjacent sorting plates (151) is greater than the distance between two adjacent baffles (17).

9. The dynamic powder selection device for a high-efficiency cement grinding mill according to claim 4, characterized in that: The distance between two adjacent baffles (17) is greater than the distance between two adjacent fan blades (18).

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