Vertical grinding system capable of selecting powder in grading mode

Abstract

The utility model discloses a vertical grinding system capable of selecting powder in a grading mode, and belongs to the technical field of grinding equipment. The grinding part is rotationally positioned in the shell and is used for crushing and grinding the materials; the powder selecting part comprises a powder selecting machine and a coarse powder pre-separating device, the powder selecting machine is located in the portion, above the grinding part, of the shell, and the coarse powder pre-separating device is located in an annular space between the powder selecting machine and the shell; the coarse powder pre-separation device is used for reducing the concentration of dust entering a separation area in the powder concentrator from wind powder flow of the grinding part; and the powder concentrator is used for screening material particles in the wind powder flow treated by the coarse powder pre-separation device. By arranging the coarse powder pre-separation device, the concentration of dust entering the separation area in the powder concentrator is reduced, interference of coarse particles on the powder selecting function of the powder concentrator is reduced, the powder selecting efficiency is improved, meanwhile, the powder concentrator can obtain the needed particle fineness at the low rotating speed, and the resistance of the powder concentrator is reduced due to reduction of the rotating speed.

Description

Technical Field

[0001] The utility model belongs to the technical field of grinding equipment and relates to a vertical grinding system capable of graded powder selection. Background Art

[0002] In the process of utilizing materials such as metal slag, non-metallic ores, bentonite, limestone, anthracite, etc., it is usually necessary to grind the materials into a specific surface area of ​​400cm 2 / g or above powder. At present, the vertical grinding mill, that is, the vertical grinding system, is mainly used in the market to complete the powder making work. The vertical grinding system mainly consists of the grinding parts that complete the material crushing and grinding work and the powder separator that completes the particle sorting work.

[0003] In the existing vertical grinding system, there are problems such as uneven grinding disc distribution, low grinding efficiency, low efficiency of powder classifier, high unit consumption of powder making, and large ventilation resistance.

[0004] In order to solve the above problems, it is necessary to propose a vertical grinding system with graded powder selection. Utility Model Content

[0005] In order to at least solve the problem of low efficiency of the powder classifier in the above-mentioned prior art vertical grinding system, the utility model provides the following technical solution: a vertical grinding system capable of graded powder selection, the vertical grinding system comprising:

[0006] case;

[0007] a grinding portion, the grinding portion being rotatably located within the housing and being used to crush and grind materials; and

[0008] a powder selection section, the powder selection section comprising: a powder classifier and a coarse powder pre-separation device, the powder classifier being located in the housing above the grinding section, and the coarse powder pre-separation device being located in an annular space between the powder classifier and the housing;

[0009] The coarse powder pre-separation device is used to reduce the dust concentration of the air powder flow from the grinding part entering the separation area of ​​the powder classifier;

[0010] The powder classifier is used to screen the material particles in the air-powder flow processed by the coarse powder pre-separation device.

[0011] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the coarse powder pre-separation device comprises: a separation plate;

[0012] A plurality of separation plates are arranged in the annular space at intervals along the circumference. The separation plates are arranged at an angle to the vertical direction. One end of the separation plate is connected to the powder classifier, and the other end of the separation plate is connected to the shell.

[0013] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the classifier is provided with a plurality of air flow channels communicating with the separation zone at intervals along the circumference;

[0014] The air flow channel is used to change the moving direction of the air-powder flow from the coarse powder pre-separation device.

[0015] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the powder classifier comprises: a powder selection cage, an air guide blade assembly, a powder return cone and a driving device;

[0016] The shell is provided with a powder outlet, and the upper part of the shell is provided with a mounting plate;

[0017] The powder selection cage is located in the housing below the mounting plate;

[0018] The driving device is located on the top of the housing, and one end of the driving device is connected to one end of the powder selection cage passing through the through hole on the mounting plate, so as to drive the powder selection cage to rotate;

[0019] A plurality of air guide blade assemblies are arranged at intervals along the circumference of the powder selection cage, one end of the air guide blade assembly is connected to the bottom of the mounting plate, and the other end of the air guide blade assembly is connected to one end of the powder return cone;

[0020] The powder return cone is connected to the shell, and the other end of the powder return cone is provided with a stirring device;

[0021] The stirring device is used to cooperate with the grinding part to disperse the material.

[0022] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the stirring device comprises: a stirring rod, a bracket and an adjustable component;

[0023] The bracket is connected to the other end of the powder return cone;

[0024] The stirring rod is arranged horizontally, and both ends of the stirring rod are connected to the bracket through adjustable components, and the middle part of the stirring rod is in contact with the material to be ground in the grinding part;

[0025] The adjustable component is used to adjust the distance between the stirring rod and the bracket.

[0026] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the powder selection cage comprises: a rotor impeller, cage blades and a central shaft;

[0027] The rotor impeller is sleeved on the central shaft, and one end of the central shaft is connected to the driving device;

[0028] A plurality of cage blades are evenly distributed along the circumference of the side wall of the rotor impeller;

[0029] One end of the rotating cage blade is bent toward the rotation direction of the rotor impeller.

[0030] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the air guide blade assembly includes: a first stationary blade, a second stationary blade and a windshield;

[0031] The windshield is vertically arranged between the mounting plate and the powder return cone, and the windshield is parallel to the tangent direction of the rotor impeller;

[0032] The first stationary blade is located at one end of the windshield, the first stationary blade is arranged at an angle to the windshield, and the length of the first stationary blade is greater than the length of the second stationary blade;

[0033] The second stationary blade is located at the other end of the wind shield, and the second stationary blade is arranged at an angle to the tangent line of the rotor impeller.

[0034] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, a sealing fan blade is provided on the top of the rotating cage blade;

[0035] The sealing blade is arranged at the same direction and angle as the first stationary blade, and a retaining ring is provided on both sides of the sealing blade;

[0036] One end of the retaining ring is connected to the bottom of the mounting plate.

[0037] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the grinding section comprises: a grinding disc, a grinding roller, a driving assembly and a loading rocker arm;

[0038] The grinding disc is coaxially arranged with the powder selection part;

[0039] The grinding roller is located on one side above the grinding disc;

[0040] The driving assembly is connected to the grinding disc and is used to drive the grinding disc to rotate;

[0041] The loading rocker arm is connected to the grinding roller and is used to apply downward pressure to the grinding roller.

[0042] Optionally, in the above-mentioned vertical grinding system capable of graded powder selection, the vertical grinding system further comprises: a screw feeder and a return chute;

[0043] One end of the screw feeder penetrates the housing below the coarse powder pre-separation device and then extends into the inner cavity of the powder return cone, and the discharge port of the screw feeder is opposite to the center of the grinding part;

[0044] The return material chute is arranged obliquely, and one end of the return material chute penetrates the shell above the coarse powder pre-separation device and then extends into the inner cavity of the powder return cone.

[0045] The beneficial effects of the technical solution provided by the embodiment of the utility model are:

[0046] This application reduces the dust concentration entering the separation zone of the powder classifier by arranging a coarse powder pre-separation device in the annular space between the powder classifier and the shell, reduces the interference of coarse particles on the powder selection function of the powder classifier, and improves the powder selection efficiency. At the same time, the powder classifier can obtain the required particle fineness at a lower speed, and the reduction in speed reduces the resistance of the powder classifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic structural diagram of a vertical grinding system capable of graded powder selection provided by an embodiment of the present utility model;

[0048] Figure 2 A schematic diagram of the specific structure of a stirring device in a vertical grinding system capable of graded powder selection provided by an embodiment of the present utility model;

[0049] Figure 3 A schematic diagram of the specific structure of a powder selection part in a vertical grinding system capable of graded powder selection provided by an embodiment of the present utility model;

[0050] Figure 4 A schematic diagram of the position of a coarse powder pre-separation device in a vertical grinding system with graded powder selection provided by an embodiment of the present invention;

[0051] Figure 5 A schematic top view of the structure of a coarse powder pre-separation device in a vertical grinding system with graded powder selection provided by an embodiment of the present invention;

[0052] Figure 6 A schematic top view of the positional relationship between the air guide blade assembly and the cage blades in a vertical grinding system capable of graded powder selection provided by an embodiment of the present invention;

[0053] Figure 7 A schematic diagram of the position of sealing blades in a vertical grinding system with graded powder selection provided by an embodiment of the present utility model;

[0054] Figure 8 for Figure 7 Schematic top view of

[0055] Figure 9 A schematic diagram of the specific structure of a driving device in a vertical grinding system with graded powder selection provided by an embodiment of the present utility model;

[0056] In the figure: 1. Shell; 2. Coarse powder pre-separation device; 21. Separation plate; 3. Powder classifier; 31. Powder classifying cage; 311. Rotor impeller; 312. Cage blade; 313. Center shaft; 314. Sealing fan blade; 315. Retaining ring; 32. Wind guide blade assembly; 321. First stationary blade; 322. Second stationary blade; 323. Wind shield; 33. Return powder cone; 4. Powder outlet; 5. Agitator; 51. Agitator rod; 52. Bracket; 53. Adjustable assembly; 531. Bolt; 532. Support rod; 6. Grinding disc; 7. Grinding roller; 8. Drive assembly; 81. Drive motor; 82. Reducer; 9. Loading rocker arm; 10. Screw feeder; 11. Return chute; 12. Drive device; 13. Mounting plate. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0058] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0059] See also Figure 1-9 The utility model provides the following technical solutions: a vertical grinding system capable of graded powder selection, the vertical grinding system comprising: a shell 1, a grinding part and a powder selection part.

[0060] The rotation of the grinding section is located in the shell 1, and the rotation of the grinding section can be achieved by an electric motor. This embodiment does not limit the electric motor. The grinding section is used to crush and grind materials (such as metal slag, non-metallic ores, bentonite, limestone, anthracite, etc.). This embodiment does not limit how the material reaches the grinding area of ​​the grinding section (referring to the central area of ​​the grinding disc 6), and it can be achieved by adopting the technical means commonly used in this field. The powder selection section includes: a powder classifier 3 and a coarse powder pre-separation device 2. The powder classifier 3 is located in the shell 1 above the grinding section, and there is an annular space (interval) between the powder classifier 3 and the shell 1, and the coarse powder pre-separation device 2 is located in the annular space. The coarse powder pre-separation device 2 is used to reduce the dust concentration of the air-powder flow from the grinding section entering the separation area in the powder classifier 3. The powder classifier 3 is used to screen the material particles in the air-powder flow that has been processed by the coarse powder pre-separation device 2. It should be noted that the powder classifier 3 corresponds to the middle position of the shell 1, refer to Figure 1 As shown, the shell 1 at this position (the middle part of the shell 1) is also called the powder classifier 3 shell. The powder classifier 3 shell is a high-efficiency pneumatic structure composed of two sections, the lower section of the shell is a frustum-shaped tube with a gradually increasing diameter from bottom to top, and the upper section of the shell is a frustum-shaped tube with a gradually decreasing diameter from bottom to top. The two sections of the shell are connected by flange bolts. When in use, the grinding part grinds and crushes the material falling on the grinding disc 6 to form particles. The material particles are blown up by the hot air outside the grinding disc 6. The hot air carries the material particles to form an air-powder flow. The air-powder flow rises continuously along the inner wall of the shell 1, and first enters the annular space between the powder classifier 3 (referring to the return powder cone 33) and the shell 1 (referring to the lower section of the shell in the powder classifier 3 shell). The flow cross-sectional area of ​​the air-powder flow gradually increases, and the speed gradually decreases. A part of the coarse powder with larger particles falls back to the grinding disc 6 due to the rising potential energy that cannot resist the weight of the particles. The air-powder flow continues to rise, and while the speed decreases, it passes through the After passing through the coarse powder pre-separation device 2, a part of the coarse particles hit the coarse powder pre-separation device 2 and lose the upward kinetic energy and fall back to the grinding disc 6, and the remaining particles continue to rise with the wind powder flow and enter the upper shell area in the outer shell of the powder classifier 3, and then enter the separation area in the powder classifier 3 through the air flow channel. It can be seen that the addition of the coarse powder pre-separation device 2 reduces the dust concentration entering the separation area, reduces the interference of coarse particles on the powder selection function of the powder classifier 3, improves the powder selection efficiency, and realizes graded powder selection. The powder classifier 3 can obtain the required particle fineness at a lower speed, and the reduction in speed reduces the resistance of the powder classifier 3.

[0061] Reference Figure 4 and Figure 5As shown, the coarse powder pre-separation device 2 includes: a separation plate 21. The separation plate 21 is made of wear-resistant steel plate. Specifically, multiple separation plates 21 are arranged in an annular space (between the lower shell of the powder selector 3 and the powder selector 1) at intervals along the circumference. Each separation plate 21 has a horizontal installation angle, that is, each separation plate 21 is set at an angle to the vertical direction, so that the wind and powder flow passing through the separation plate 21 forms a uniform wind field with a spiral upward (that is, a uniform upward spiral wind). One end of the separation plate 21 is connected to the powder selector 3, and the other end of the separation plate 21 is connected to the shell 1. Preferably, the powder classifier 3 is provided with a plurality of air flow channels connecting the separation zones at intervals along the circumference, and each air flow channel is used to change the movement direction of the wind-powder flow from the coarse powder pre-separation device 2 and to pre-separate the wind-powder flow, that is, after the wind-powder flow passes through the gap between the separation plates 21, due to the annular space between the upper shell of the powder classifier 3 and the powder classifier 3, the annular cross-sectional area of ​​the annular space gradually decreases from bottom to top, causing the wind-powder flow pressure to gradually increase, forcing the wind-powder flow to change its movement direction, and a part of the coarse particles in the wind-powder flow cannot keep the coarse particles moving upward due to the drag force of the airflow, and thus fall back to the grinding disc 6, and the remaining particles follow the airflow along the airflow channel into the separation zone in the powder classifier 3.

[0062] Reference Figure 3 As shown, the powder selection machine 3 includes: a powder selection cage 31, an air guide blade assembly 32, a powder return cone 33 and a drive device 12. A powder outlet 4 is provided on the shell 1, and a mounting plate 13 is provided on the upper part of the shell 1. The mounting plate 13 has a through hole. We usually call the shell 1 at the powder outlet 4 together with the mounting plate 13 a powder outlet assembly. The powder selection cage 31 (referred to as the cage) is located in the shell 1 below the mounting plate 13, and the powder selection cage 31 can be driven to rotate by an electric motor. This embodiment does not limit the electric motor. The drive device 12 is located at the top of the shell 1, and one end of the drive device 12 is connected to one end of the powder selection cage 31 passing through the through hole on the mounting plate 13. The drive device 12 is used to drive the powder selection cage 31 to rotate. The drive device 12 can be composed of a combination of a variable frequency motor and a reduction motor, or a permanent magnet direct drive variable frequency motor (such as Figure 9As shown). Under the control of the driving device 12, the powder selection cage 31 can rotate infinitely within the range of 0-200r / min, thereby screening out powders with different fineness requirements. A plurality of air guide blade assemblies 32 are arranged at intervals along the circumference on the periphery of the powder selection cage 31 (refer to 6), and at the same time, one end of the air guide blade assembly 32 is connected to the bottom of the mounting plate 13, and the mounting plate 13 between the air guide blade assembly 32 and the shell 1 blocks the air powder flow from the coarse powder pre-separation device 2 from continuing to move upward, and cooperates with the gap between the air guide blade assemblies 32 (that is, the air flow channel on the powder selector 3) to change the forward direction of the air powder flow, so that the air powder flow enters the separation zone smoothly. Preferably, the position of the air flow channel matches the position of the gap between the separation plates 21, so that the resistance encountered by the air powder flow when entering the separation zone is minimized. The other end of the air guide blade assembly 32 is connected to one end of the powder return cone 33. The powder return cone 33 is connected to the housing 1 , and a stirring device 5 is provided at the other end of the powder return cone 33 . The stirring device 5 is used to cooperate with the grinding part to disperse the material.

[0063] Reference Figure 2 As shown, as an embodiment of the specific structure of the above-mentioned stirring device 5, in this embodiment, the stirring device 5 includes: a stirring rod 51, a bracket 52 and an adjustable component 53. Specifically, the bracket 52 is connected to the other end of the powder return cone 33, such as welding the bracket 52 to the outer wall of the lower end of the powder return cone 33. The stirring rod 51 is arranged horizontally (parallel to the plane of the grinding disc 6), and at the same time, the two ends of the stirring rod 51 are connected to the bracket 52 through the adjustable component 53, and the middle part of the stirring rod 51 is in contact with the material to be ground in the grinding part. The adjustable component 53 is used to adjust the distance between the stirring rod 51 and the bracket 52. Preferably, the adjustable component 53 includes: a support rod 532 and a bolt 531. A plurality of through holes are provided on the support rod 532, and the lower end of the support rod 532 is fixedly connected to the stirring rod 51. The bracket 52 is provided with a plurality of mounting holes in the vertical direction. The bracket 52 and the support rod 532 are detachably connected by bolts 531 inserted into the mounting holes and the through holes. When it is necessary to adjust the distance between the stirring rod 51 and the plane of the grinding disc 6, the bolt 531 is pulled out, and then the stirring rod 51 is moved up or down. After adjusting to the appropriate position, the stirring rod 51 is mounted on the bracket 52 with the bolt 531. Conventional vertical mills do not have a stirring device 5. After the material falls into the central area of ​​the grinding disc 6, the material rotates with the grinding disc 6 and is dispersed to the surroundings by centrifugal force and its own weight. Since the linear speed of the central area is low when rotating, the centrifugal force is small, and the material cannot be dispersed quickly. The present application installs a stirring device 5 below the powder return cone 33, and adjusts the distance between the stirring rod 51 and the plane of the grinding disc 6 according to the type of material and the feed amount. In this way, the material to be ground rotates with the grinding disc 6, constantly contacts the middle of the stirring rod 51, and is quickly dispersed outward.

[0064] As an embodiment of the specific structure of the above-mentioned powder selection cage 31, in this embodiment, the powder selection cage 31 includes: a rotor impeller 311, cage blades 312 and a central shaft 313. Specifically, the rotor impeller 311 is sleeved on the central shaft 313, and one end of the central shaft 313 is connected to the driving device 12 located at the top of the shell 1. A plurality of cage blades 312 are evenly distributed along the circumference on the side wall of the rotor impeller 311. One end of the cage blade 312 is bent toward the rotation direction of the rotor impeller 311, which can also be understood as the outer side of the cage blade 312 having a forward-inclined curved edge, which can enhance the fanning ability of the cage blade 312 and generate an inward pressure force, reducing the pressure difference between the inside and outside of the blade. When the cage blade 312 rotates, the material sorting ability is enhanced, the powder is gathered and thrown up, and the coarser particles are thrown out to enter (refer to Figure 6 In the windless separation area on the back side of the air guide blade assembly 32 (referring to the side of the second static blade 322 away from the rotating cage blade 312), qualified fine powder passes through the rotating cage blade 312 and enters the powder discharge assembly upward.

[0065] Reference Figure 6 As shown, the wind guide blade assembly 32 includes: a first stationary blade 321, a second stationary blade 322 and a windshield 323. Specifically, the windshield 323 is parallel to the tangent direction of the rotor impeller 311, that is, the single-piece windshield 323 is tangent to the pitch circle of the windshield 323. At the same time, the windshield 323 is vertically arranged between the powder discharge assembly (referring to the mounting plate 13) and the powder return cone 33. In other words, the cross-sectional area of ​​the annular space gradually decreases from the maximum diameter in the middle of the shell 1 to the top, and the cross-sectional area of ​​the annular space is the smallest at the top of the wind guide blade assembly 32, so that the wind and powder flow will not stay and idle in the space above the shell 1, but will quickly pass through the wind guide blade assembly 32 into the separation area. Such a structure greatly improves the circulation efficiency of the wind and powder flow in the powder classifier 3. The two ends of the windshield 323 are respectively connected to the bottom of the mounting plate 13 and the upper end of the powder return cone 33. The first stator blade 321 is located at one end of the windshield 323, at an angle to the windshield 323. The length of the first stator blade 321 is greater than that of the second stator blade 322. The second stator blade 322 is located at the other end of the windshield 323, at an angle to the tangent of the rotor impeller 311. The first stator blade 321 guides the flow of air and powder, causing impact separation between the air and powder. This allows a portion of the particles to be sorted and fall into the powder return cone 33. The second stator blade 322 cooperates with the first stator blade 321 to form a circulation channel, creating a windless separation zone behind the second stator blade 322. Powder that enters the back of the second stator blade 322 falls rapidly into the powder return cone 33 due to the lack of force, and no longer enters the separation zone of the cage. This reduces the concentration of air and powder entering the cage, and lowers the power consumption and pressure of the cage.

[0066] Reference Figure 7 and Figure 8As shown, a sealing blade 314 is provided on the top of the cage blade 312, that is, the sealing blade 314 is located between the cage and the mounting plate 13. The sealing blade 314 is arranged at the same direction and angle as the first static blade 321, that is, the two are arranged in parallel. A retaining ring 315 is provided on both sides of the sealing blade 314. One end of the retaining ring 315 is connected to the bottom of the mounting plate 13, such as by a bolt connection. The sealing blade 314 rotates with the cage, so that the sealing blade 314 will generate outward air pressure during the rotation of the cage. The retaining rings 315 on both sides of the sealing blade 314 sandwich it in the middle, which can effectively prevent pressure loss, prevent the wind and powder flow from passing through the top area of ​​the cage, and avoid the sorted coarse powder from escaping into the powder outlet assembly.

[0067] Reference Figure 1 As shown, the grinding section includes: a grinding disc 6, a grinding roller 7, a drive assembly 8 and a loading rocker arm 9. Specifically, the grinding disc 6 is coaxially arranged with the powder selection section (referring to the powder selector 3), so that the material can fall to the central area of ​​the grinding disc 6 along the powder return cone 33. The grinding roller 7 is located on the upper side of the grinding disc 6. The number of grinding rollers 7 can be set according to actual needs and is not limited in this embodiment. The drive assembly 8 is connected to the grinding disc 6 and is used to drive the grinding disc 6 to rotate. Preferably, the drive assembly 8 includes: a drive motor 81 and a reducer 82, the drive motor 81 is connected to the reducer 82, and the reducer 82 is connected to the grinding disc 6. The loading rocker arm 9 is connected to the grinding roller 7 and is used to apply downward pressure to the grinding roller 7, that is, when the grinding disc 6 rotates, the grinding roller 7 rotates under the friction of the material, and under the action of the weight of the grinding roller 7 and the downward pressure applied by the loading rocker arm 9, the grinding roller 7 squeezes and grinds the material to form particles.

[0068] To feed the grinding disc 6 and re-grind the returned powder, the vertical grinding system also includes a screw feeder 10 and a return chute 11. Specifically, one end of the screw feeder 10 penetrates the housing 1 below the coarse powder pre-separator 2 and then extends into the inner cavity of the return powder cone 33. The discharge port of the screw feeder 10 is located above the grinding disc 6, opposite the center of the grinding section, ensuring that the material falls from the discharge port to the center area of ​​the grinding disc 6. The return chute 11 is tilted. After one end of the return chute 11 penetrates the housing 1 above the coarse powder pre-separator 2, it passes through the lower end of the guide vane assembly, and its outlet is located on the inner side of the upper edge of the return powder cone 33, that is, it extends into the inner cavity of the return powder cone 33. The coarse powder overflowing from the grinding disc 6 is transported to the upper part of the return chute 11 via a lifting device (not shown). The coarse powder returns through the chute and enters the inner side of the return powder cone 33, then falls back to the grinding disc 6 for re-grinding. The return chute 11 reduces the loss of coarse powder materials and improves the production efficiency of the vertical mill.

[0069] It is understood from common technical knowledge that the present invention may be implemented through other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A vertical grinding system capable of graded powder selection, characterized in that: The vertical grinding system comprises: case; a grinding portion, the grinding portion being rotatably located within the housing and being used to crush and grind materials; and a powder selection section, the powder selection section comprising: a powder classifier and a coarse powder pre-separation device, the powder classifier being located in the housing above the grinding section, and the coarse powder pre-separation device being located in an annular space between the powder classifier and the housing; The coarse powder pre-separation device is used to reduce the dust concentration of the air powder flow from the grinding part entering the separation area of ​​the powder classifier; The powder classifier is used to screen the material particles in the air-powder flow processed by the coarse powder pre-separation device.

2. The vertical grinding system with graded powder selection according to claim 1 is characterized in that: The coarse powder pre-separation device includes: a separation plate; A plurality of separation plates are arranged in the annular space at intervals along the circumference. The separation plates are arranged at an angle to the vertical direction. One end of the separation plate is connected to the powder classifier, and the other end of the separation plate is connected to the shell.

3. The vertical grinding system with graded powder selection according to claim 1 is characterized in that: The powder classifier is provided with a plurality of air flow channels communicating with the separation zone at intervals along the circumference; The air flow channel is used to change the moving direction of the air-powder flow from the coarse powder pre-separation device and pre-separate the air-powder flow.

4. The vertical grinding system with graded powder selection according to claim 1 is characterized in that: The powder classifier comprises: a powder classifying cage, an air guide blade assembly, a powder return cone and a driving device; The shell is provided with a powder outlet, and the upper part of the shell is provided with a mounting plate; The powder selection cage is located in the housing below the mounting plate; The driving device is located on the top of the housing, and one end of the driving device is connected to one end of the powder selection cage passing through the through hole on the mounting plate, so as to drive the powder selection cage to rotate; A plurality of air guide blade assemblies are arranged at intervals along the circumference of the powder selection cage, one end of the air guide blade assembly is connected to the bottom of the mounting plate, and the other end of the air guide blade assembly is connected to one end of the powder return cone; The powder return cone is connected to the shell, and the other end of the powder return cone is provided with a stirring device; The stirring device is used to cooperate with the grinding part to disperse the material.

5. The vertical grinding system with graded powder selection according to claim 4 is characterized in that: The stirring device comprises: a stirring rod, a bracket and an adjustable component; The bracket is connected to the other end of the powder return cone; The stirring rod is arranged horizontally, and both ends of the stirring rod are connected to the bracket through adjustable components, and the middle part of the stirring rod is in contact with the material to be ground in the grinding part; The adjustable component is used to adjust the distance between the stirring rod and the bracket.

6. The vertical grinding system with graded powder selection according to claim 4 is characterized in that: The powder selection cage includes: a rotor impeller, cage blades and a central shaft; The rotor impeller is sleeved on the central shaft, and one end of the central shaft is connected to the driving device; A plurality of cage blades are evenly distributed along the circumference of the side wall of the rotor impeller; One end of the rotating cage blade is bent toward the rotation direction of the rotor impeller.

7. The vertical grinding system with graded powder selection according to claim 6 is characterized in that: The wind guide blade assembly includes: a first stationary blade, a second stationary blade and a wind deflector; The windshield is vertically arranged between the mounting plate and the powder return cone, and the windshield is parallel to the tangent direction of the rotor impeller; The first stationary blade is located at one end of the windshield, the first stationary blade is arranged at an angle to the windshield, and the length of the first stationary blade is greater than the length of the second stationary blade; The second stationary blade is located at the other end of the wind shield, and the second stationary blade is arranged at an angle to the tangent line of the rotor impeller.

8. The vertical grinding system with graded powder selection according to claim 7 is characterized in that: A sealing fan blade is provided on the top of the rotating cage blade; The sealing blade is arranged at the same direction and angle as the first stationary blade, and a retaining ring is provided on both sides of the sealing blade; One end of the retaining ring is connected to the bottom of the mounting plate.

9. The vertical grinding system with graded powder selection according to claim 1 is characterized in that: The grinding part includes: a grinding disc, a grinding roller, a driving assembly and a loading rocker arm; The grinding disc is coaxially arranged with the powder selection part; The grinding roller is located on one side above the grinding disc; The driving assembly is connected to the grinding disc and is used to drive the grinding disc to rotate; The loading rocker arm is connected to the grinding roller and is used to apply downward pressure to the grinding roller.

10. The vertical grinding system capable of graded powder selection according to claim 4, characterized in that: The vertical grinding system further comprises: a spiral feeder and a return chute; One end of the screw feeder penetrates the housing below the coarse powder pre-separation device and then extends into the inner cavity of the powder return cone, and the discharge port of the screw feeder is opposite to the center of the grinding part; The return material chute is arranged obliquely, and one end of the return material chute penetrates the shell above the coarse powder pre-separation device and then extends into the inner cavity of the powder return cone.

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