A multi-stage grinding device for vertical roller mill for cement production

Abstract

The present invention relates to the technical field of grinding devices, and specifically discloses a multi-stage grinding device of a vertical roller mill for cement production, including a shell, a grinding disc is rotatably arranged in the shell, two rollers are arranged on the top of the grinding disc, a cone is rotatably connected to the middle of the grinding disc, a two-stage grinding box is arranged above the cone, the two-stage grinding box is connected to the side wall of the box, a rotor is arranged at the top of the box, and a funnel is arranged below the rotor. In the present invention, large-particle materials enter the two-stage grinding box, and the two-stage grinding roller grinds the large-particle materials. The ground small-particle materials are pushed out by spiral blades and blown to the vicinity of the rotor by the rising air flow in the shell, and the powder after secondary grinding is collected. The large-particle powder falling into the feed trough is ground more efficiently by the two-stage grinding roller, and the grinding efficiency of the grinding disc for new materials is also higher. Even if more and larger materials are continuously added, the grinding disc and the two-stage grinding box can still maintain a high grinding efficiency, thereby increasing the overall efficiency of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of grinding devices, and in particular to a multi-stage grinding device of a vertical roller mill for cement production. Background Art

[0002] Vertical roller mill is used for grinding cement raw materials, cement clinker, slag and coal slag. It has the characteristics of simple structure, low manufacturing and use cost. The motor drives the grinding disc to rotate through the reducer, and the material falls on the grinding disc from the feed port, and the hot air enters the mill from the air inlet. As the grinding disc rotates, the material is crushed by the grinding roller when passing through the annular groove on the grinding disc. After crushing, the material is carried by the high-speed airflow of the wind ring at the edge of the grinding disc, and the large particles fall directly on the grinding disc for re-grinding. When the material in the airflow passes through the upper separator, the coarse powder falls from the funnel to the grinding disc for re-grinding under the action of the rotating rotor, and the qualified fine powder is discharged from the mill with the airflow and collected by the dust collecting device, which is the product.

[0003] When the volume of the material is large and the feeding speed is fast, the first grinding of the material on the grinding disc is not sufficient, and the large particles fall back onto the grinding disc through the funnel and need to be ground again by the roller. At this time, if new materials are continuously added, the large particles that fall back onto the grinding disc will affect the grinding efficiency of the new materials, resulting in a decrease in the overall grinding efficiency of the equipment. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multi-stage grinding device for a vertical roller mill for cement production.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-stage grinding device of a vertical roller mill for cement production comprises a shell, a grinding disc is rotatably arranged in the shell, two rollers are arranged on the top of the grinding disc, a cone cylinder is rotatably connected to the middle of the grinding disc, a two-stage grinding box is arranged above the cone cylinder, the two-stage grinding box is connected to the side wall of the box body, a rotor is arranged at the top of the box body, a funnel is arranged below the rotor, the bottom of the funnel is connected to the feed trough at the top of the two-stage grinding box, and a plurality of two-stage grinding rollers are arranged in the two-stage grinding box.

[0007] Preferably, the two-stage grinding roller is located below the feed trough, a transverse groove for discharging is provided below the two-stage grinding roller, the bottom of the feed trough is connected to the transverse groove through the two-stage grinding roller, and a spiral blade is provided in the transverse groove.

[0008] Preferably, a motor for driving is provided in the second-stage grinding box, and the motor drives all the second-stage grinding rollers and spiral blades to rotate through multiple driving belts. The second-stage grinding rollers and the motor are respectively located in two spaces in the second-stage grinding box.

[0009] Preferably, the top of the cone is connected to the bottom of the second-stage grinding box, and two magnetic columns are connected to the outside of the cone. A fixed sleeve is provided on the outside of the magnetic column, and a threaded groove is provided on the outside of the fixed sleeve. The magnetic column and the roller are spaced 90° apart along the circumferential direction of the cone.

[0010] Preferably, two sleeves are fixedly connected to the outside of the cone, a swivel is rotatably installed in the sleeve, one end of the swivel away from the cone is fixedly connected to a mounting rod, and the other end of the mounting rod is connected to the magnetic column.

[0011] Preferably, a strong magnetic block is provided on the inner edge of the cone cylinder, a rotating plate groove is opened on the edge of the cone cylinder, a rotating plate that can be opened toward the inside of the cone cylinder is provided in the rotating plate groove, the top of the rotating plate is connected to the top of the rotating plate groove by a pin, and a torsion spring is sleeved on the outer side of the pin, and a sealing strip is installed on the edge of the rotating plate.

[0012] Preferably, the feed port is arranged at an angle, and an inclined block is fixed on the top of the feed port, the thickness of the inclined block gradually decreases from far away from the discharge end to close to the discharge end, and a slide plate is slidably installed on the bottom of the inclined block.

[0013] Preferably, a slide groove is opened along the inclined surface at the bottom of the inclined block, a slider is slidably installed in the slide groove, the slider is fixedly connected to the slide plate, a spring is fixedly connected to one side of the slider close to the discharge end, and the other end of the spring is fixedly connected to the inner wall of the slide groove.

[0014] Preferably, a feed hole is opened at the bottom of the skateboard, a collecting box is fixedly installed at the bottom of one side of the skateboard close to the discharging end, the height of the collecting box is lower than the feed trough, a weighing plate is provided at the bottom of the collecting box, a pressure sensor is provided at the bottom of the weighing plate, a first heating plate is provided on the top of the weighing plate, the height of the side of the collecting box close to the discharging end is lower than the heights of other sides, a second heating plate is provided on the top of the feed port, a fixed plate is provided on the side of the skateboard away from the discharging end, an electric push rod is fixedly installed on the side of the fixed plate close to the skateboard, and the telescopic end of the electric push rod can abut against the skateboard.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Large particles enter the second-stage grinding box, and the second-stage grinding roller grinds the large particles. The ground small particles are pushed out by the spiral blades and blown to the vicinity of the rotor by the rising airflow in the shell. The rotor screens and collects the powder that has undergone secondary grinding. The large particles that fall into the feed trough are ground more efficiently by the second-stage grinding roller, and the grinding efficiency of the grinding disc for new materials is also higher. Even if more and larger materials are continuously added, the grinding disc and the second-stage grinding box can still maintain a high grinding efficiency, thereby increasing the overall efficiency of the equipment.

[0017] 2. When the height of the material entering the feed port is uneven, the bottom of the slide plate scrapes the material pile to make the material transmission more uniform, avoiding uneven material accumulation on the grinding disc, causing abnormal vibration of the roller during the grinding process, and the uniform distribution of the material on the grinding disc can increase the grinding efficiency of the grinding disc.

[0018] 3. When testing the moisture content of the material, the electric push rod pushes the slide plate and the collection box to make the collection box out of contact with the material. The first heating plate heats at a predetermined power to evaporate the moisture in the material. The pressure sensor can detect the weight reduction of the material. When it is detected that the moisture content in the material is relatively high, the second heating plate heats the material passing through the feed port to reduce the moisture content of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the two-stage grinding box shown in the present invention;

[0021] Figure 3 It is a structural schematic diagram of the cone shown in the present invention;

[0022] Figure 4 It is a cross-sectional view of the cone shown in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the fixing sleeve shown in the present invention;

[0024] Figure 6 It is a cross-sectional view of the fixing sleeve shown in the present invention;

[0025] Figure 7 It is a cross-sectional view of the feed port shown in the present invention;

[0026] Figure 8 As shown in the present invention Figure 7 A magnified schematic diagram of part A;

[0027] Fig. 9 It is a structural schematic diagram of the slide plate 22 shown in the present invention;

[0028] Fig.10 It is a cross-sectional view of the collecting box shown in the present invention.

[0029] In the figure: 1. shell; 2. grinding disc; 3. roller; 4. cone; 5. two-stage grinding box; 6. rotor; 7. feed port; 8. funnel; 9. feed trough; 10. two-stage grinding roller; 11. transverse groove; 12. spiral blade; 13. driving belt; 14. sleeve; 15. magnetic column; 16. fixed sleeve; 17. threaded groove; 18. mounting rod; 19. strong magnetic block; 20. inclined block; 21. slide; 22. slide plate; 23. fixed plate; 24. electric push rod; 25. collecting box; 26. first heating plate; 27. weighing plate; 28. motor; 29. ​​rotating plate; 30. rotating ring; 31. second heating plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-Figure 10 A multi-stage grinding device of a vertical roller mill for cement production includes a shell 1, a grinding disc 2 is rotatably arranged in the shell 1, two rollers 3 are arranged on the top of the grinding disc 2, a cone cylinder 4 is rotatably connected to the middle of the grinding disc 2, a two-stage grinding box 5 is arranged above the cone cylinder 4, the two-stage grinding box 5 is connected to the side wall of the box body 1, a rotor 6 is arranged at the top of the box body 1, a funnel 8 is arranged below the rotor 6, the bottom of the funnel 8 is connected to the feed trough 9 on the top of the two-stage grinding box 5, and a plurality of two-stage grinding rollers 10 are arranged in the two-stage grinding box 5.

[0032] As a technical optimization solution of the present invention, the two-stage grinding roller 10 is located below the feed trough 9, and a transverse groove 11 for discharging is provided below the two-stage grinding roller 10. The bottom of the feed trough 9 is connected to the transverse groove 11 through the two-stage grinding roller 10, and a spiral blade 12 is provided in the transverse groove 11. When large particles enter the second-stage grinding box 5 through the funnel 8, the second-stage grinding roller 10 grinds the large particles, and the ground small particles fall into the transverse groove 11. The spiral blade 12 rotates to push the small particles in the transverse groove 11 out, and the small particles are blown to the vicinity of the rotor 6 by the rising airflow in the shell 1, and the rotor 6 screens and collects the powder that has undergone secondary grinding. Since the particles are sealed and blown up, the large particles that fall into the feed trough 9 are ground more efficiently by the second-stage grinding roller 10. The grinding disc 2 only grinds the newly added materials and does not need to re-grind the large particles. Therefore, the grinding efficiency of the grinding disc 2 is also higher. Even if more and larger materials are continuously added, the grinding disc 2 and the second-stage grinding box 5 can still maintain a high grinding efficiency, thereby increasing the overall efficiency of the equipment.

[0033] As a technical optimization solution of the present invention, a motor 28 for driving is provided in the second-stage grinding box 5, and the motor 28 drives all the second-stage grinding rollers 10 and the spiral blades 12 to rotate through multiple driving belts 13. The second-stage grinding rollers 10 and the motor 28 are respectively located in two spaces in the second-stage grinding box 5. The motor 28 is located in a relatively sealed space to prevent the powder from affecting the operation of the motor 28.

[0034] As a technical optimization solution of the present invention, the top of the cone cylinder 4 is connected to the bottom of the second-stage grinding box 5, and two magnetic columns 15 are connected to the outside of the cone cylinder 4. A fixed sleeve 16 is sleeved on the outside of the magnetic column 15, and a thread groove 17 is opened on the outside of the fixed sleeve 16. The magnetic column 15 and the roller 3 are spaced 90 degrees apart along the circumferential direction of the cone cylinder 4. When the grinding disc 2 rotates, the fixed sleeve 16 contacts the material, flattens the material, facilitates grinding, and avoids abnormal vibration of the roller 3. The magnetic column 15 will absorb iron-containing impurities that may be mixed in the material. When the magnetic column 15 is adsorbed to the iron-containing impurities, the impurities will enter the thread groove 17 on the fixed sleeve 16 to prevent the iron-containing impurities from falling when being pushed by the material.

[0035] As a technical optimization solution of the present invention, two sleeves 14 are fixedly connected to the outside of the cone 4, a swivel 30 is rotatably installed inside the sleeve 14, and an installation rod 18 is fixedly connected to one end of the swivel 30 away from the cone 4, and the other end of the installation rod 18 is connected to the magnetic column 15.

[0036] As a technical optimization solution of the present invention, a strong magnetic block 19 is provided at the inner edge of the cone cylinder 4, a rotating plate groove is provided at the edge of the cone cylinder 4, a rotating plate 29 which can be opened to the inside of the cone cylinder 4 is provided in the rotating plate groove, the top of the rotating plate 29 is connected to the top of the rotating plate groove by a pin shaft, and a torsion spring is sleeved on the outer side of the pin shaft, and a sealing strip is installed at the edge of the rotating plate 29. The iron-containing impurities adsorbed by the strong magnetic block 19 will stick to the surface of the cone cylinder 4. After the iron-containing impurities are partially accumulated, the iron-containing impurities will push the rotating plate 29 to open the rotating plate 29 to the inside of the cone cylinder 4, and the iron-containing impurities will enter the inside of the cone cylinder 4, so as to avoid excessive accumulation of iron-containing impurities outside the cone cylinder 4. The sealing strip on the rotating plate 29 can prevent materials from entering the cone cylinder 4.

[0037] As a technical optimization solution of the present invention, the feed port 7 is inclined, and an inclined block 20 is fixed on the top of the feed port 7. The thickness of the inclined block 20 gradually decreases from far away from the discharge end to close to the discharge end. A slide plate 22 is slidably installed at the bottom of the inclined block 20. When the material passes through the feed port 7, the material pushes the slide plate 22 to slide. When the height of the material entering the feed port 7 is uneven, the bottom of the slide plate 22 scrapes the material pile, making the material transmission more uniform, avoiding uneven material stacking on the grinding disc 2, causing abnormal vibration of the roller 3 during the grinding process, and the uniform distribution of the material on the grinding disc 2 can increase the grinding efficiency of the grinding disc 2.

[0038] As a technical optimization solution of the present invention, a chute 21 is provided along the inclined surface at the bottom of the inclined block 20, a slider is slidably installed in the chute 21, the slider is fixedly connected to the slide plate 22, a spring is fixedly connected to the side of the slider close to the discharge end, and the other end of the spring is fixedly connected to the inner wall of the chute 21. The material pushes the slide plate 22 to slide, and the slide plate 22 drives the slide plate to squeeze the spring. When the amount of material passing through the feed port 7 increases, the slide plate 22 slides along the inclined block 20, the gap between the bottom of the slide plate 22 and the bottom of the feed port 7 increases, and the amount of material passing through increases, which can actively make the speed of the material passing through the feed port 7 more uniform.

[0039] As a technical optimization scheme of the present invention, a feed hole is opened at the bottom of the skateboard 22, a collecting box 25 is fixedly installed at the bottom of one side of the skateboard 22 close to the discharge end, the height of the collecting box 25 is lower than the feed trough, a weighing plate 27 is provided at the bottom of the collecting box 25, a pressure sensor is provided at the bottom of the weighing plate 27, a first heating plate 26 is provided at the top of the weighing plate 27, the height of the side of the collecting box 25 close to the discharge end is lower than the height of other sides, a second heating plate 31 is provided at the top of the feed port 7, a fixed plate 23 is provided on the side of the skateboard 22 away from the discharge end, an electric push rod 24 is fixedly installed on the side of the fixed plate 23 close to the skateboard 22, and the telescopic end of the electric push rod 24 can abut against the skateboard 22. When the moisture content of the material is detected, the electric push rod 24 extends, pushing the slide plate 22 and the collection box 25 to move, so that the collection box 25 is out of contact with the material passing through the feed port 7. At this time, the pressure sensor records the weight of the material, and the first heating plate 26 heats at a predetermined power to evaporate the moisture in the material. After the moisture evaporates, the weight of the material decreases, and the pressure sensor can detect the weight reduction of the material. After heating for a certain period of time at a fixed heating efficiency, the more the weight of the material is reduced, the greater the moisture content in the material, and the moisture content in the material can be continuously detected.

[0040] When the present invention is used, firstly, the equipment is powered on, and the grinding disc 2 and the roller 3 are driven to rotate by an external power device, and the material is sent to the grinding disc 2 through the feed port 7, and the conical cylinder 4 pushes the material evenly to the edge of the grinding disc 2, so that the grinding disc 2 and the roller 3 can grind the material. When the external air inlet pipeline blows hot air into the housing 1, the material powder is blown to the vicinity of the rotor 6, and the rotor 6 screens the material, and the large particles of the material fall into the funnel 8, and the small particles of the material enter the external dust collecting device for collection;

[0041] After the large particles enter the funnel 8, they follow the funnel 8 into the feed trough 9 on the second-stage grinding box 5, and then the motor 28 drives the multiple second-stage grinding rollers 10 to rotate to grind the large particles. The ground small particles fall into the transverse groove 11, and the spiral blades 12 rotate to push the small particles in the transverse groove 11 out. After being pushed out by the spiral blades 12, the small particles will be blown to the vicinity of the rotor 6 by the rising airflow in the shell 1, and the rotor 6 will screen and collect the powder that has undergone secondary grinding. Since the particles are blown up by the wind, the large particles that fall into the feed trough 9 are ground more efficiently by the second-stage grinding rollers 10. The grinding disc 2 only grinds the newly added materials and does not need to grind the large particles again, so the grinding efficiency of the grinding disc 2 is also higher. Even if more and larger materials are continuously added, the grinding disc 2 and the second-stage grinding box 5 can still maintain a high grinding efficiency, thereby increasing the overall efficiency of the equipment.

[0042] When the material passes through the feed port 7, the material pushes the slide plate 22 to slide, and the slide plate 22 drives the slide block to squeeze the spring. When the amount of material passing through the feed port 7 increases, the slide plate 22 slides along the inclined block 20, and the gap between the bottom of the slide plate 22 and the bottom of the feed port 7 increases, and the amount of material passing through increases, which can prevent the slide plate 22 from completely blocking the feed port 7 and making it difficult for the material to pass through. When the height of the material entering the feed port 7 is uneven, the bottom of the slide plate 22 scrapes the material pile to make the material more even during transmission, thereby preventing the material from being unevenly piled on the grinding disc 2, causing abnormal vibration of the roller 3 during the grinding process, and the material is evenly distributed on the grinding disc 2 to increase the grinding efficiency of the grinding disc 2.

[0043] The pressure sensor, the electric push rod 24, the first heating plate 26 and the second heating plate 31 are electrically connected to an external processor; the pressure sensor model used in this embodiment is a FS20 force sensor.

[0044] When the material pushes the slide plate 22, part of the material will enter the collection box 25 through the feed hole on the slide plate 22. After a part of the material in the collection box 25 is accumulated, when the moisture content of the material needs to be detected, the electric push rod 24 extends, pushes the slide plate 22 and the collection box 25 to move, so that the collection box 25 is out of contact with the material passing through the feed port 7. At this time, the pressure sensor records the weight of the material, and the first heating plate 26 heats with a predetermined power to evaporate the moisture in the material. After the moisture evaporates, the weight of the material decreases. The pressure sensor can detect the weight reduction of the material. After heating for a certain period of time at a fixed heating efficiency, the more the weight of the material decreases, the greater the moisture content in the material. When it is detected that the moisture content in the material is relatively large, the second heating plate 31 heats the material passing through the feed port 7 to reduce the moisture content of the material. After the detection is completed, the electric push rod 24 is retracted, the slide plate 22 and the collection box 25 are reset, the material impacts the slide plate 22, and the slide plate 22 and the collection box 25 shake, thereby shaking out the material after detection in the collection box 25.

[0045] Since only a small amount of the material will enter the collecting box 25 through the feeding hole when the material passes through the feeding port 7 and pushes the slide plate 22, the water content of the sample collected in the collecting box 25 is relatively uniform, and the detection accuracy is higher. When the material passes through the feeding port 7, the material continuously enters the collecting box 25, and the material in the collecting box 25 is continuously shaken out, so that a certain amount of material is always stored in the collecting box 25, and the material is always updated, which is convenient for detection at any time.

[0046] The height of the collecting box 25 near the discharging end is relatively low, so that the material can be shaken out from the collecting box 25 near the discharging end, thereby preventing the material from being stuck in the collecting box 25 and affecting the measurement result.

[0047] After the material falls on the grinding disc 2, when the grinding disc 2 rotates, the fixed sleeve 16 contacts the material and flattens the material to facilitate grinding and avoid abnormal vibration of the roller 3. The magnetic column 15 will absorb the iron-containing impurities that may be mixed in the material. When the magnetic column 15 absorbs the iron-containing impurities, the impurities will enter the threaded groove 17 on the fixed sleeve 16 to prevent the iron-containing impurities from falling when being pushed by the material. The strong magnetic block 19 in the cone 4 can further absorb the iron-containing impurities in the material. The iron-containing impurities absorbed by the strong magnetic block 19 will stick to the surface of the cone 4. After the iron-containing impurities accumulate, the iron-containing impurities will push the rotating plate 29, open the rotating plate 29 into the cone 4, and the iron-containing impurities will enter the inside of the cone 4 to avoid excessive accumulation of iron-containing impurities outside the cone 4. When a certain amount of ferrous impurities are accumulated outside the fixed sleeve 16, the strong magnetic block 19 also has a certain adsorption effect on the ferrous impurities outside the fixed sleeve 16, so that the ferrous impurities move toward the direction close to the cone 4, making the ferrous impurities closer to the cone 4, further preventing the material from pushing away the ferrous impurities.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage grinding device for a vertical roller mill for cement production, comprising a housing (1), characterized in that: A grinding disc (2) is rotatably arranged in the shell (1), two rollers (3) are arranged on the top of the grinding disc (2), a cone cylinder (4) is rotatably connected to the middle of the grinding disc (2), a second-stage grinding box (5) is arranged above the cone cylinder (4), the second-stage grinding box (5) is connected to the side wall of the shell (1), a rotor (6) is arranged at the top of the shell (1), a funnel (8) is arranged below the rotor (6), the bottom of the funnel (8) is connected to the feed trough (9) at the top of the second-stage grinding box (5), and a plurality of second-stage grinding rollers (10) are arranged in the second-stage grinding box (5); A feed port (7) is connected to one side of the shell (1). The feed port (7) is arranged at an angle and extends into the interior of the shell (1). An inclined block (20) is fixed to the top of the feed port (7). The thickness of the inclined block (20) gradually decreases from the farthest end to the closest end. A slide plate (22) is slidably mounted on the bottom of the inclined block (20). The bottom of the inclined block (20) is provided with a slide groove (21) along the inclined surface, a slider is slidably installed in the slide groove (21), the slider is fixedly connected to the slide plate (22), a spring is fixedly connected to one side of the slider close to the discharge end, and the other end of the spring is fixedly connected to the inner wall of the slide groove (21); A feed hole is provided at the bottom of the slide plate (22); a collecting box (25) is fixedly mounted on the bottom of one side of the slide plate (22) close to the discharge end; the height of the collecting box (25) is lower than the feed hole; a weighing plate (27) is provided at the bottom of the collecting box (25); a pressure sensor is provided at the bottom of the weighing plate (27); a first heating plate (26) is provided at the top of the weighing plate (27); the height of the side of the collecting box (25) close to the discharge end is lower than the height of the other side; a second heating plate (31) is provided at the top of the feed port (7); a fixing plate (23) is provided at the side of the inclined block (20) away from the discharge end; an electric push rod (24) is fixedly mounted on the side of the fixing plate (23) close to the slide plate (22); and the telescopic end of the electric push rod (24) can abut against the slide plate (22).

2. A multi-stage grinding device for a vertical roller mill for cement production according to claim 1, characterized in that: The two-stage grinding roller (10) is located below the feed trough (9), and a transverse groove (11) for discharging materials is provided below the two-stage grinding roller (10). The bottom of the feed trough (9) is connected to the transverse groove (11) through the two-stage grinding roller (10), and a spiral blade (12) is provided in the transverse groove (11).

3. A multi-stage grinding device for a vertical roller mill for cement production according to claim 2, characterized in that: A motor (28) for driving is provided in the second-stage grinding box (5); the motor (28) drives all the second-stage grinding rollers (10) and spiral blades (12) to rotate via a plurality of drive belts (13); the second-stage grinding rollers (10) and the motor (28) are respectively located in two spaces in the second-stage grinding box (5).

4. The multi-stage grinding device of a vertical roller mill for cement production according to claim 1, characterized in that: The top of the cone cylinder (4) is connected to the bottom of the second-stage grinding box (5), and two magnetic columns (15) are connected to the outside of the cone cylinder (4). A fixing sleeve (16) is sleeved on the outside of the magnetic column (15), and a threaded groove (17) is formed on the outside of the fixing sleeve (16). The magnetic column (15) and the roller (3) are spaced 90 degrees apart along the circumferential direction of the cone cylinder (4).

5. The multi-stage grinding device of a vertical roller mill for cement production according to claim 4, characterized in that: The cone cylinder (4) is fixedly connected to two sleeves (14) on the outside, a swivel (30) is rotatably installed inside the sleeve (14), one end of the swivel (30) away from the cone cylinder (4) is fixedly connected to a mounting rod (18), and the other end of the mounting rod (18) is connected to the magnetic column (15).

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