A vertical roller mill in which both the grinding roller and the grinding table are driven members and a method for designing the same

Abstract

The application provides a vertical roller mill with both the grinding roller and the grinding disc being driving members, and a design method thereof. The grinding roller and the grinding disc are driven to rotate by different driving devices, and the grinding roller and the grinding disc are combined in rolling and driven to bite into the material, so that the problem of material accumulation at the front end of the grinding roller and the problem of large vibration of the mill are solved, a plurality of smaller motors and reducers are used to replace the original driving device, and the difficulty of large-scale of the vertical roller mill is solved; the rotating speed of the grinding roller and the grinding disc is adjustable, the adaptability of the vertical roller mill to different materials is improved, and the capacity of the mill is further improved. Moreover, the second reduction device used in the vertical roller mill is a two-stage planetary structure, the transmission efficiency is improved, the torque is ensured to be large, and the structure is more compact. In addition, in the design of the vertical roller mill, multiple parameters such as material characteristics are comprehensively considered, and reasonable design is performed, so that the best grinding efficiency is achieved.

Description

Technical Field

[0001] This invention relates to the field of vertical roller mill equipment, and more specifically to a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, and its design method. Background Technology

[0002] Vertical roller mills are grinding equipment that integrates grinding, drying, and powder selection, and are widely used in grinding various materials such as cement, raw materials, and coal powder. However, in recent years, with the technological advancements in roller presses, the power consumption of roller presses for grinding raw materials is significantly lower than that of vertical roller mills. Generally, when grinding the same material, the main power consumption of a vertical roller mill is about 0.8 kWh / t higher than that of a roller press, resulting in a significant decrease in the competitiveness of vertical roller mills.

[0003] From a grinding mechanism perspective, both vertical roller mills and roller presses are bed grinding processes. However, vertical roller mills suffer from poor controllability of the material layer, relying solely on retaining rings to adjust the stability of the material layer and grinding efficiency. Increasing the retaining rings thickens the material layer, leading to lower grinding efficiency; decreasing the retaining rings thins the material layer, increasing grinding efficiency but causing greater mill vibration. Roller presses, on the other hand, use two opposing and synchronously rotating rollers. The material is actively bitten into the grinding zone by the frictional force of the two actively rotating rollers, resulting in better stability than vertical roller mills. Therefore, larger roller pressures can be used, leading to higher grinding efficiency. In contrast, existing vertical roller mills rely on the active rotation of the grinding disc. The material on the disc generates friction against the rollers, which rotate passively. Material accumulation at the feed front of the rollers is unavoidable, especially with thicker material layers. This accumulation disrupts the stability of the material layer, increasing mill vibration and hindering the application of roller pressure. Consequently, the grinding efficiency is lower than that of roller presses, and the power consumption per unit is higher.

[0004] The scaling up of vertical mills requires larger motor power and higher reducer torque. The challenge lies in the increased manufacturing difficulty of high-power motors and reducers, especially the large spiral bevel, which significantly increases costs. Grinding different materials in the same vertical mill necessitates adjusting the grinding disc speed; however, manufacturing frequency converters for high-power motors is extremely difficult, so the motors are typically kept at a constant speed. This results in lower adaptability of vertical mills for grinding a variety of materials.

[0005] Chinese Patent Publication No. CN117427732A discloses a vertical roller mill driven by a grinding roller and its grinding method, which belongs to the field of vertical roller mill equipment. However, this patent adopts a single-stage planetary structure, which has low transmission efficiency and limited adjustment range of reduction ratio, thus limiting the improvement of the grinding capacity of the vertical roller mill.

[0006] In addition, the existing vertical roller mill design lacks comprehensive consideration of multiple parameters, resulting in an unscientific and impractical design that may lead to poor grinding efficiency and high energy consumption. Summary of the Invention

[0007] This invention provides a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, and its design method. It is used to solve the difficulties in the prior art, such as unstable material layer, limited range of reduction ratio adjustment, difficulty in improving the grinding capacity of vertical roller mills, and difficulty in manufacturing the reducer after the vertical mill is enlarged, as well as the problem of poor adaptability to different materials.

[0008] This invention provides a design method for a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, comprising:

[0009] Determine the main parameters of the vertical roller mill:

[0010] The total installed power of the mill is determined based on the material characteristics, mill design hours, and finished product characteristics. W ;

[0011] grinding disc diameter Grinding disc speed The motor power of the grinding disc Number of grinding rollers n, diameter of grinding rollers Grinding roller width Grinding roller speed Motor power of each grinding roller The projected pressure P of each grinding roller;

[0012] Motor power of each grinding roller W R The total installed power W The ratio of the number of grinding rollers (n) to the total number of grinding rollers (n) is 0.5 to 0.55; the motor power of the grinding disc... W T Total installed capacity W 0.45 to 0.5 times; the mill design time is the total amount of work that the mill is designed to complete in one hour;

[0013] The grinding disc rotation speed Based on the material's characteristic coefficient K Confirmed, the calculation formula is as follows:

[0014] = K / D T 0.5 (1)

[0015] In formula (1), K The value range is 52~58, and the grinding disc speed is... The unit is m / s;

[0016] The rotational speed of the grinding roller According to the diameter of the grinding disc D TGrinding roller width Grinding roller diameter and grinding disc speed Confirmed, the calculation formula is as follows:

[0017] = (D T -0.8 ) / (2)

[0018] In formula (2), the grinding roller speed The unit is m / s, and the diameter of the grinding disc is... D T Grinding roller width and grinding roller diameter The unit is m;

[0019] The diameter of the grinding roller The diameter of the grinding disc D T 0.4 to 0.6 times; the width of the grinding roller The diameter of the grinding roller 0.3 to 0.35 times;

[0020] The roller-disc area ratio A of the vertical roller mill is calculated using the following formula:

[0021] A=n / (1 / 4π D T 2 (3)

[0022] The range of the roller area ratio A is 0.22 to 0.32;

[0023] The projected pressure P of each grinding roller on the material on the grinding disc is calculated using the following formula:

[0024] P=F / ( · (4)

[0025] In formula (4), F is the grinding pressure of the grinding roller on the material on the grinding disc, in N; the projected pressure P of the grinding roller on the material on the grinding disc is 1400~1600 KN / m. 2 ;

[0026] The angle between the center line of the grinding roller and the horizontal plane is 15°~20°;

[0027] The reduction ratio of the second reduction device in the grinding roller drive assembly that drives the grinding roller to rotate actively is 10~16.

[0028] The present invention also provides a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components. The design method of the present invention is adopted, and includes: a grinding disc, multiple grinding rollers evenly distributed on the grinding disc, and a limiting component for adjusting the gap between the corresponding grinding roller and the grinding disc.

[0029] Each grinding roller is driven to rotate by a corresponding grinding roller drive assembly; the grinding roller drive assembly includes a grinding roller motor, a first reduction gear, a grinding roller coupling, a drive shaft, and a second reduction gear; the second reduction gear is a two-stage planetary structure, disposed inside the mill and connected to the grinding roller; the drive shaft is rotatably disposed inside the grinding roller shaft, and the grinding roller is connected to the outer surface of the grinding roller shaft near the center of the grinding disc; the power output by the grinding roller motor is transmitted to the drive shaft through the grinding roller coupling, and then to the second reduction gear through the drive shaft, and after being reduced by the second reduction gear, it is transmitted to the grinding roller, thereby driving the grinding roller to rotate automatically;

[0030] The grinding disc is driven to rotate by a corresponding grinding disc drive assembly; the grinding disc drive assembly includes a grinding disc motor and a diaphragm coupling and a grinding disc reducer connected in sequence to the output end of the grinding disc motor, and the grinding disc is fixed on the grinding disc reducer; the power output by the grinding disc motor is reduced by the grinding disc reducer and drives the grinding disc to rotate actively.

[0031] The grinding roller and the grinding disc rotate respectively and cooperate with each other to actively bite the material into the gap between the grinding roller and the grinding disc;

[0032] The vertical roller mill also includes a pressure assembly. The first end of the upper rocker arm of the pressure assembly is fixed to the outer surface of the grinding roller shaft. The second end of the upper rocker arm is fixedly connected to the first end of the lower rocker arm through a rocker arm shaft. The second end of the lower rocker arm is hinged to a hydraulic cylinder. Under the contraction of the hydraulic cylinder, the grinding roller is driven to rotate around the center line of the rocker arm shaft.

[0033] Optionally, each of the pressurizing components includes a corresponding limiting component; the first end of the limiting component is fixed to the side wall of the concrete support, and the second end of the limiting component abuts against the corresponding lower rocker arm;

[0034] The limiting assembly includes a lead screw, a slider, and a through cover; the inner surface of the slider is connected to the inner surface of the lead screw via a T-shaped thread; the through cover is fixed to the concrete support, and the slider is installed inside the through cover;

[0035] A disc spring is provided at one end of the lead screw near the concrete support, and a counter-thrust force is generated when the lead screw compresses the disc spring.

[0036] The lead screw is equipped with a handle. Rotating the handle can adjust the distance between the rocker arm and the lead screw to adjust the minimum gap between the grinding roller and the grinding disc, and avoid direct contact between the grinding roller and the grinding disc.

[0037] Optionally, the grinding roller coupling is a high-elasticity rubber coupling.

[0038] Optionally, a first reduction gear is provided between the grinding roller motor and the grinding roller coupling. The first reduction gear is a single-stage bevel gear reducer, and the reduction ratio of the first reduction gear is 1 to 2.

[0039] Optionally, the input shaft of the first speed reduction device is coaxial with the center line of the grinding roller motor, and the output shaft of the first speed reduction device is coaxial with the center line of the grinding roller.

[0040] Optionally, the center line of the rocker arm shaft is parallel to the center line of the grinding roller motor, and the center line of the rocker arm shaft is perpendicular to the center line of the grinding roller.

[0041] Optionally, both the grinding roller motor and the grinding disc motor are variable frequency motors, which can adjust the rotational speed of the grinding disc and the grinding roller respectively.

[0042] Optionally, two adjacent concrete supports are integrally cast using a concrete connecting bridge.

[0043] The present invention has at least the following beneficial effects:

[0044] This invention provides a vertical roller mill with both the grinding roller and grinding disc being actively rotating components, along with its design method. The grinding roller and grinding disc are driven by different drive devices, and the roller and disc engage in a rolling motion to actively feed the material, solving the problems of material accumulation at the feed front of the grinding roller and excessive mill vibration. Several smaller motors and reducers replace the original drive devices, overcoming the challenge of scaling up vertical mills. The adjustable speed of the grinding roller and grinding disc improves the adaptability of the vertical mill to different materials, facilitating further increases in mill capacity. Furthermore, the second reduction device used in the vertical roller mill is a two-stage planetary structure, improving transmission efficiency while ensuring greater torque, resulting in a more compact structure. In addition, the design of the vertical roller mill comprehensively considers multiple parameters, including material characteristics, to achieve optimal grinding efficiency. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a front view of a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, according to an embodiment of the present invention.

[0047] Figure 2 This is a schematic diagram of a three-roll vertical roller mill in which both the grinding rollers and the grinding disc are actively rotating components.

[0048] Figure 3 This is an isometric view of a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components.

[0049] Figure 4 This is a cross-sectional view of a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components.

[0050] Figure 5 This is a detailed diagram of the second reduction gear in a vertical roller mill where both the grinding roller and the grinding disc are actively rotating components.

[0051] Figure 6 This is a partial view of a vertical roller mill limiting assembly in which both the grinding roller and the grinding disc are actively rotating components.

[0052] Figure label:

[0053] In the diagram: 1. Grinding roller motor; 2. Second reduction gear; 201. First planetary gear; 202. First planetary gear bearing; 203. First planetary gear shaft; 204. Second planetary gear; 205. Second planetary gear bearing; 206. Second planetary gear shaft; 207. Second planetary carrier; 208. First planetary carrier; 209. End cover; 210. First self-aligning bearing; 211. Second sun gear; 212. Second self-aligning bearing; 213. First sun gear; 214. Output flange; 215. Internal gear ring seat; 215a. Second internal gear ring; 215b. First internal gear ring; 216. Third self-aligning bearing; 217. Connecting frame; 3. Grinding roller coupling; 4. Rocker arm; 4a. Upper rocker arm; 4b. 5. Lower rocker arm; 6. Grinding roller; 7. Roller sleeve; 8. Wheel hub; 9. First reduction gear; 10. Drive shaft; 11. Grinding roller shaft; 12. Rocker arm shaft; 13. Bearing housing; 14. Hydraulic cylinder; 15. Concrete support; 16. Grinding disc reducer; 17. Grinding disc; 18. Diaphragm coupling; 19. Grinding disc motor; 20. Concrete connecting bridge; 11. Lead screw; 12. Handle; 12. Slider; 23. Through cover; 24. Disc spring; 25. Output sleeve;

[0054] C1, mill centerline; C2, grinding roller centerline; C3, rocker arm shaft centerline; C4, grinding roller motor centerline. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] This invention provides a design method for a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, comprising:

[0057] Determine the main parameters of the vertical roller mill:

[0058] The total installed power of the mill is determined based on the material characteristics, mill design hours, and finished product characteristics. W ;

[0059] grinding disc diameter Grinding disc speed The motor power of the grinding disc Number of grinding rollers n, diameter of grinding rollers Grinding roller width Grinding roller speed Motor power of each grinding roller The projected pressure P of each grinding roller. Grinding roller diameter. It is the diameter of the largest circular cross-section where the center of the side edge of the grinding roller is located.

[0060] Motor power of each grinding roller W R The total installed power W The ratio of the number of grinding rollers (n) to the total number of grinding rollers (n) is 0.5 to 0.55; the motor power of the grinding disc... W T Total installed capacity W 0.45 to 0.5 times; the mill design time is the total amount of work that the mill is designed to complete in one hour;

[0061] The grinding disc rotation speed Based on the material's characteristic coefficient K Confirmed, the calculation formula is as follows:

[0062] = K / D T 0.5 (1)

[0063] In the above formula (1), K The value range is 52~58; grinding disc speed The unit is m / s;

[0064] The rotational speed of the grinding roller According to the diameter of the grinding discD T Grinding roller width Grinding roller diameter and grinding disc speed Confirmed, the calculation formula is as follows:

[0065] = (D T -0.8 ) / (2)

[0066] In formula (2), the grinding roller speed The unit is m / s, and the diameter of the grinding disc is... Grinding roller width and grinding roller diameter The unit is m;

[0067] The diameter of the grinding roller The diameter of the grinding disc D T 0.4 to 0.6 times; the width of the grinding roller The diameter of the grinding roller 0.3 to 0.35 times;

[0068] The roller-disc area ratio A of the vertical roller mill is calculated using the following formula:

[0069] A=n / (1 / 4πD T 2 (3)

[0070] The grinding roller speed range is 40~60 rpm.

[0071] The roller-disc area ratio A ranges from 0.22 to 0.32. The roller-disc area ratio refers to the ratio of the total area of ​​all the grinding rollers projected onto the grinding disc to the total area of ​​the grinding disc.

[0072] The projected pressure P of each grinding roller on the material on the grinding disc is calculated using the following formula:

[0073] P=F / ( · (4)

[0074] In formula (4), F is the grinding pressure of the grinding roller on the material on the grinding disc, in N; the projected pressure P of the grinding roller on the material on the grinding disc is 1400~1600 KN / m. 2 ;

[0075] The angle α between the centerline of the grinding roller and the horizontal plane is 15°~20°; the angle β between the two sides of the grinding roller cross-section is twice the angle between the centerline of the grinding roller and the horizontal plane. A reasonable angle design can change the distribution of pressure and shear force exerted by the grinding roller on the material, allowing the material to undergo more uniform and effective grinding during the grinding process. This can reduce energy loss and material waste during grinding, and improve the grinding effect.

[0076] The reduction ratio of the second reduction device in the grinding roller drive assembly that drives the grinding roller to rotate actively is 10~16. The second reduction device is a two-stage planetary structure. After determining the total power and the grinding roller speed, the main dimensions of each structure in the second reduction device, such as gear diameter and number of teeth, can be determined according to the required reduction ratio. A reasonable reduction ratio can reduce energy loss during transmission, significantly improving transmission efficiency and helping the vertical roller mill to grind materials more stably and efficiently during operation, thereby improving overall work efficiency. Furthermore, a suitable reduction ratio helps maintain the stable operation of the second reduction device, reducing vibration and impact, thus improving the stability of the entire system.

[0077] The present invention also provides a vertical roller mill in which both the grinding roller and the grinding disc are active rotating components. The design method of the present invention is adopted, and includes: a grinding disc 14, a plurality of grinding rollers 5 evenly distributed on the grinding disc 14, and a limiting component for adjusting the gap between the corresponding grinding roller 5 and the grinding disc 14.

[0078] The grinding roller 5 is driven to rotate by a grinding roller drive assembly; the grinding roller drive assembly includes a grinding roller motor 1, a first reduction gear 6, a grinding roller coupling 3, a transmission shaft 7, and a second reduction gear 2; the second reduction gear 2 is a two-stage planetary transmission mechanism, which is located inside the mill and connected to the grinding roller 5; the transmission shaft 7 is rotatably arranged inside the grinding roller shaft 8, and the grinding roller 5 is connected to the outer surface of the grinding roller shaft 8 near the center of the grinding disc 14.

[0079] The power output by the grinding roller motor 1 is transmitted to the drive shaft 7 through the grinding roller coupling 3, and then to the second reduction device 2 through the drive shaft 7. After being reduced by the second reduction device 2, the power is transmitted to the grinding roller 5, thereby driving the grinding roller 5 to rotate automatically.

[0080] Each grinding disc 14 is driven to rotate by a corresponding grinding disc drive assembly; the grinding disc drive assembly includes a grinding disc motor 16 and a diaphragm coupling 15 and a grinding disc reducer 13 connected in sequence to the output end of the grinding disc motor 16, and the grinding disc 14 is fixed on the grinding disc reducer 13; the power output by the grinding disc motor 16 is reduced by the grinding disc reducer 13 and drives the grinding disc 14 to rotate actively; the grinding roller and the grinding disc rotate respectively and cooperate with each other to actively bite the material into the gap between the grinding roller and the grinding disc.

[0081] Specifically, the grinding rollers and grinding disc rotate separately and cooperate with each other, actively biting the material into the gap between the grinding rollers and grinding disc. In this invention, viewed from above in a vertical roller mill, the center line of the grinding disc 14 is the mill center line C1. The grinding disc 14 rotates counterclockwise, while the grinding roller 5 rotates clockwise when viewed from the mill center towards it. Multiple grinding rollers 5 are circumferentially distributed on the grinding disc 14, and their distribution when there are three grinding rollers 5 is as follows... Figure 3 As shown, each grinding roller 5 is equipped with a set of grinding roller drive components.

[0082] The grinding roller drive assembly includes a grinding roller motor 1, a first reduction gear 6, a grinding roller coupling 3, a drive shaft 7, and a second reduction gear 2. The grinding roller motor 1 provides power and transmits it to the drive shaft 7 via the grinding roller coupling 3. The drive shaft 7 is mounted inside the grinding roller shaft 8 via bearings and can rotate within the grinding roller shaft 8. A grinding roller 5 is rotatably mounted on the outer surface of the end of the grinding roller shaft 8 near the center of the grinding disc 14. The grinding roller 5 includes a hub 5b disposed on the outer surface of the grinding roller shaft 8 and a roller sleeve 5a fitted around the outer circumference of the hub. The end of the drive shaft 7 near the center of the grinding disc 14 is connected to the second reduction gear 2, which converts a portion of the rotational speed of the drive shaft 7 into torque, which is transmitted to the grinding roller 5, driving the grinding roller 5 to rotate actively. The grinding disc 14 is driven to rotate by an independent grinding disc drive assembly, which is sequentially connected to a grinding disc motor 16, a diaphragm coupling 15, and a grinding disc reducer 13. The grinding disc 14 is connected to the grinding disc reducer 13. The power output of the grinding disc motor 16 is transmitted to the grinding disc reducer 13 through the diaphragm coupling 15. The grinding disc reducer 13 converts part of the speed into torque and transmits it to the grinding disc 14, driving the grinding disc 14 to rotate actively.

[0083] A first reduction gear 6 is installed between the grinding roller motor 1 and the grinding roller coupling 3. Since the motor output speed is relatively high, the power is initially reduced by the first reduction gear 6 before transmission. The grinding roller drive assembly has two reducers, which allows for easier adjustment of the transmission ratio of the entire system to adapt to different working requirements. This makes the entire transmission system more flexible and facilitates a horizontal motor arrangement, avoiding the increased cost associated with a tilted motor arrangement.

[0084] The vertical roller mill is also equipped with a pressurizing assembly for adjusting the pressure of the grinding roller 5 on the material on the grinding disc 14. The rocker arm 4 includes an upper rocker arm 4a and a lower rocker arm 4b. The first end of the upper rocker arm 4a is fixedly mounted on the outer surface of the grinding roller shaft 8. The second end of the upper rocker arm 4a is located below the first end of the upper rocker arm 4a, and the second end of the upper rocker arm 4a is fixedly connected to the first end of the lower rocker arm 4b via a rocker arm shaft 9. The lower rocker arm 4b is rotatably fixed within a bearing seat 10 via the rocker arm shaft 9. The bearing seat 10 is embedded in a concrete support 12. The second end of the lower rocker arm 4b is hinged to a hydraulic cylinder 11. When the hydraulic cylinder 11 extends or retracts, the first end of the upper rocker arm 4a acts on the grinding roller shaft 8, thereby moving the grinding roller 5 away from or closer to the surface of the grinding disc 14, thus adjusting the pressure of the grinding roller 5 on the material on the grinding disc 14. The grinding roller motor 1 is horizontally arranged at the rear end of the pressurizing assembly.

[0085] In this application, the second reduction device 2 is a two-stage planetary transmission mechanism, including a first planetary transmission stage and a second planetary transmission stage. The first sun gear 213 is located on the outer surface of the first end of the transmission shaft 7 and is coaxially connected to the transmission shaft 7 via a spline, thereby transmitting power from the transmission shaft 7 to the first sun gear 213. A plurality of first planetary gears 201 are disposed within the first planetary carrier 208. Each planetary gear meshes with the first sun gear 213 and the first internal gear ring 215b, respectively. The first internal gear ring 215b and the second internal gear ring 215a are both fixed within the internal gear ring seat 215, which is fixed to the connecting frame 217. Each first planetary gear 201 is provided with a first planetary gear shaft 203. The first planetary gear 201 is rotatably mounted on the first planetary gear shaft 203 via a first planetary gear bearing 202, which is a sliding bearing. The first planetary gear shaft 203 is fixedly connected to the first planetary carrier 208, and power is transmitted to the first planetary carrier 208 via the first planetary gear shaft 203.

[0086] The first side of the second sun gear 211 is mounted on the outer surface of the end of the drive shaft 7 via the second self-aligning bearing 212. The outer surface of the second sun gear 211 of the second planetary transmission stage includes two steps with different diameters. The step with the smaller outer diameter is the first external gear ring of the second sun gear, which has externally convex teeth. The step with the larger outer diameter is the second external gear ring of the second sun gear. The internally convex teeth of the first planetary carrier 208 mesh with the first external gear ring of the second sun gear. Several second planetary gears 204 are fixed inside the second planetary carrier 207. Each second planetary gear 204 has a second planetary gear shaft 206 inside. The second planetary gears 204 are rotatably mounted on the second planetary gear shaft 206 via second planetary gear bearings 205. The second planetary gear shaft 206 transmits power to the second planetary carrier 207. Since the second planetary carrier 207 is fixed to the output flange 214 by bolts and locating pins, the power of the second planetary transmission stage is ultimately output to the output flange 214. A first self-aligning bearing 210 is provided at the end of the second sun gear 211 away from the first sun gear 213. The outer ring of the first self-aligning bearing 210 is installed in the inner hole of the end cover 209, and the end cover 209 is fixedly connected to the output flange 214. In this application, there are three first planetary gears 201 and three or four second planetary gears 204. In addition, the first self-aligning bearing 210 and the second self-aligning bearing 212 are large clearance bearings, which can compensate for installation errors. In this embodiment, both the first planetary transmission stage and the second planetary transmission stage are in a floating load-sharing state and only bear torque. The transmission shaft 7 transmits power through the two-stage planetary transmission mechanism, which is beneficial to improving transmission efficiency, has a large reduction ratio, can ensure a large driving torque, has a compact structure, is easy to disassemble and assemble, has high reliability, and is easy to promote.

[0087] The second reduction gear 2 is located inside the hub 14, and the first planetary transmission stage is located between the grinding roller shaft 8 and the second planetary transmission stage. The output flange 214 of the second reduction gear 2 is fixedly connected to the output sleeve 22 and the end face of the hub 5b in sequence. The power output of the second reduction gear 2 is sent to the output flange 214 and then to the grinding roller 5, where it is converted into the torque of the grinding roller 5. The second reduction gear 2 is fixedly connected to the end of the grinding roller shaft 8 near the center of the grinding disc via a connecting frame 217. A third self-aligning bearing 216 is provided between the connecting frame 217 and the transmission shaft 7, and the transmission shaft 7 is rotatably fixed in the connecting frame 217 via the third self-aligning bearing 216. Since the connecting frame 217 is fixedly connected to one end of the grinding roller shaft 8, and both the first and second planetary transmission stages are in a floating load-sharing state, bearing only torque, the vertical vibration load of the grinding pressure of the grinding roller 5 and the load of the power transmission gear can be separated, resulting in high reliability and long service life of the grinding roller 5 side reduction mechanism. Furthermore, the second reduction gear 2 of the vertical roller mill adopts a two-stage planetary transmission mechanism with a large reduction ratio and output torque, which can reduce the size of the transmission shaft 7, thereby reducing the size of the grinding roller shaft 8 and bearings, which helps to reduce the cost of the equipment. Moreover, the two-stage planetary structure is located inside the hub, with a large reduction ratio and load-bearing capacity, which can reduce the torque and mass load of the upstream transmission system, making the required transmission structure smaller and less expensive.

[0088] In one possible implementation, each of the pressurizing components includes a corresponding limiting component; the first end of the limiting component is fixed to the side wall of the concrete support 12, and the second end of the limiting component abuts against the corresponding lower rocker arm 4b.

[0089] The limiting assembly includes a lead screw 18, a slider 19, and a through cover 20; the inner surface of the slider 19 is connected to the inner surface of the lead screw 18 by a T-shaped thread; the through cover 20 is fixed on the concrete support 12, and the slider 19 is installed inside the through cover 20.

[0090] A disc spring 21 is provided at one end of the lead screw 18 near the concrete support 12, and a counter-thrust force is generated when the lead screw 18 compresses the disc spring 21.

[0091] The lead screw 18 is provided with a handle 18a. Rotating the handle 18a can adjust the distance between the rocker arm 4 and the lead screw 18 to adjust the minimum gap between the grinding roller 5 and the grinding disc 14, and avoid direct contact between the grinding roller and the grinding disc.

[0092] Specifically, such as Figure 5 As shown, Figure 5 yes Figure 1Enlarged view of part I in the middle. A limiting component is installed on the concrete support 12 on one side of the lower rocker arm 4b, and the limiting component is horizontally installed on the side wall of the concrete. The limiting component includes a lead screw 18, a slider 19, and a through cover 20, wherein the slider 19 is fitted on the outer surface of the lead screw 18, and the slider 19 is connected to the surface of the lead screw 18 by a T-shaped thread. The through cover 20 is fixed on the concrete support 12, and the slider 19 is installed inside the through cover 20. The lead screw 18 is provided with a handle 18a. By rotating the handle 18a clockwise or counterclockwise, the lead screw 18 moves horizontally relative to the ground via the T-shaped thread. The distance between the rocker arm 4 and the lead screw 18 is adjusted in a timely manner during different wear stages of the grinding roller 5 to adjust the minimum gap between the grinding roller 5 and the grinding disc 14 during different production stages, ensuring that the roller gap S between the grinding roller and the grinding disc is always 30~50mm. The roller gap height is 50%~70% of the material layer thickness. A set of disc springs 21 is provided at one end of the lead screw 18 near the concrete support 12. The disc springs 21 are washer-type springs with a truncated conical cross section made of metal sheet or forged blank, and have a certain compression distance. When the lead screw 18 presses the disc springs 21, a counter-thrust force is generated. The disc springs at the end of the lead screw 18 near the concrete support generate a counter-thrust force when the lead screw 18 compresses the disc springs 21.

[0093] Under the action of the hydraulic cylinder 11, when the lower rocker arm 4b of the rocker arm 4 pushes out towards the limiting component, the maximum pushing distance adjusted by the lead screw 18 is the longest compression distance of the disc spring 21, which is the minimum gap between the grinding disc 14 and the grinding roller 5. By setting the limiting component, the problem of damage caused by excessive pulling force of the hydraulic cylinder 11 leading to contact between the grinding roller 5 and the grinding disc 14 can be prevented.

[0094] In one possible implementation, the grinding roller coupling 3 is a highly elastic rubber coupling.

[0095] Specifically, high-elasticity rubber couplings are used to compensate for deviations caused by the swing of rocker arm 4, providing excellent buffering. These couplings use rubber as the elastic element, exhibiting excellent elasticity and vibration damping performance. In transmission systems, the rubber material effectively absorbs and mitigates impacts and vibrations, reducing wear and damage to mechanical equipment, while also reducing noise during transmission and improving the operating efficiency of machinery. Furthermore, due to the excellent elasticity and vibration damping characteristics of rubber couplings, they can reduce energy loss when transmitting loads, thereby improving transmission efficiency.

[0096] In one possible implementation, the first reduction device 6 is a single-stage bevel gear reducer, and the reduction ratio of the first reduction device 6 is 1 to 2.

[0097] Specifically, the first reduction device 6 is a single-stage bevel gear reducer, which helps to reduce the volume of the transmission system, making the layout of the vertical roller mill more compact and saving space.

[0098] In one possible implementation, the input shaft of the first speed reduction device 6 is coaxial with the center line C4 of the grinding roller motor, and the output shaft of the first speed reduction device 6 is coaxial with the center line C2 of the grinding roller.

[0099] Specifically, a support is fixed to the top surface of the concrete support 12, and the first reduction device 6 is fixed at an angle to the horizontal plane. The center line C4 of the grinding roller motor is coaxial with the input shaft of the first reduction device 6, making power transmission more direct and reducing energy loss caused by axial or angular deviations. This improves the efficiency of the entire transmission system, allowing the power generated by the grinding roller motor 1 to be transmitted to the grinding roller 5 more effectively. Furthermore, the coaxial design makes power transmission more stable, reducing vibration and impact caused by axial deviations and improving transmission accuracy.

[0100] Similarly, the output shaft of the first reduction device 6 is coaxial with the center line C2 of the grinding roller, which can also reduce energy loss.

[0101] The input and output shafts of the first speed reduction device 6 are arranged at a 90° angle, which further reduces the space occupied by the entire vertical roller mill.

[0102] In one possible implementation, the center line C3 of the rocker arm shaft is parallel to the center line C4 of the grinding roller motor, and the center line C3 of the rocker arm shaft is perpendicular to the center line C2 of the grinding roller.

[0103] Specifically, the parallel and vertical design makes the process of adjusting the gap between the grinding roller 5 and the grinding disc 14 more intuitive and simple, thereby improving the accuracy of the adjustment.

[0104] In one possible implementation, both the grinding roller motor 1 and the grinding disc motor 16 are variable frequency motors, which can adjust the rotational speed of the grinding disc 14 and the grinding roller 5 respectively.

[0105] Specifically, by adjusting the rotational speeds of the grinding rollers 5 and the grinding disc 14, precise control of the material grinding speed can be achieved. The rotational speed can be flexibly adjusted according to the different characteristics of the materials and grinding requirements to achieve the best grinding effect, improving adaptability to different materials and thus increasing production efficiency. During the material grinding process, the motor speed and power can be adjusted according to the actual load, achieving energy saving and consumption reduction. Furthermore, the application of variable frequency motors makes the equipment more stable during startup, operation, and shutdown, reducing impact and vibration. This helps extend the equipment's service life and reduce maintenance costs.

[0106] In one possible implementation, two adjacent concrete supports 12 are integrally cast using a concrete connecting bridge 17.

[0107] Specifically, each grinding roller 5 corresponds to a concrete support 12. The entire vertical roller mill has multiple grinding rollers 5, which means multiple concrete supports 12. Each pair of adjacent concrete supports 12 is integrally cast using a concrete connecting bridge 17, which provides better vibration damping than conventionally designed structural frame structures. Furthermore, the concrete supports 12 reduce the manufacturing and transportation costs of conventionally designed structural frame structures.

[0108] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0109] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A design method for a vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, characterized in that, Determine the main parameters of the vertical roller mill: The total installed power of the mill is determined based on the material characteristics, mill design hours, and finished product characteristics. W ; grinding disc diameter Grinding disc speed The motor power of the grinding disc Number of grinding rollers n, grinding roller diameter Grinding roller width Grinding roller speed Motor power of each grinding roller The projected pressure P of each grinding roller; Motor power of each grinding roller W R The total installed power W The ratio of the number of grinding rollers (n) to the total number of grinding rollers (n) is 0.5 to 0.55; the motor power of the grinding disc... W T Total installed capacity W 0.45 to 0.5 times; the mill design time is the total amount of work that the mill is designed to complete in one hour; The grinding disc rotation speed Based on the material's characteristic coefficient K Confirmed, the calculation formula is as follows: = K / D T 0.5 (1) In formula (1), K The value range is 52~58, and the grinding disc speed is... The unit is m / s; The rotational speed of the grinding roller According to the diameter of the grinding disc D T Grinding roller width Grinding roller diameter and grinding disc speed Confirmed, the calculation formula is as follows: = (D T -0.8 ) / (2) In formula (2), the grinding roller speed The unit is m / s, and the diameter of the grinding disc is... D T Grinding roller width and grinding roller diameter The unit is m; The diameter of the grinding roller The diameter of the grinding disc D T 0.4 to 0.6 times; the width of the grinding roller The diameter of the grinding roller 0.3 to 0.35 times; The roller-disc area ratio A of the vertical roller mill is calculated using the following formula: A=n / (1 / 4π D T 2 )(3) The range of the roller area ratio A is 0.22 to 0.32; The projected pressure P of each grinding roller on the material on the grinding disc is calculated using the following formula: P=F / ( · )(4) In formula (4), F is the grinding pressure of the grinding roller on the material on the grinding disc, in N; the projected pressure P of the grinding roller on the material on the grinding disc is 1400~1600 KN / m. 2 ; The angle between the center line of the grinding roller and the horizontal plane is 15°~20°; The reduction ratio of the second reduction device in the grinding roller drive assembly that drives the grinding roller to rotate actively is 10~16.

2. A vertical roller mill in which both the grinding roller and the grinding disc are actively rotating components, characterized in that, The design method described in claim 1 includes: a grinding disc, multiple grinding rollers evenly distributed on the grinding disc, and a limiting component for adjusting the gap between the corresponding grinding rollers and the grinding disc; Each grinding roller is driven to rotate by a corresponding grinding roller drive assembly; the grinding roller drive assembly includes a grinding roller motor, a first reduction gear, a grinding roller coupling, a drive shaft, and a second reduction gear; the second reduction gear is a two-stage planetary structure, disposed inside the mill and connected to the grinding roller; the drive shaft is rotatably disposed inside the grinding roller shaft, and the grinding roller is connected to the outer surface of the grinding roller shaft near the center of the grinding disc; the power output by the grinding roller motor is transmitted to the drive shaft through the grinding roller coupling, and then to the second reduction gear through the drive shaft, and after being reduced by the second reduction gear, it is transmitted to the grinding roller, thereby driving the grinding roller to rotate automatically; The grinding disc is driven to rotate by a corresponding grinding disc drive assembly; the grinding disc drive assembly includes a grinding disc motor and a diaphragm coupling and a grinding disc reducer connected in sequence to the output end of the grinding disc motor, and the grinding disc is fixed on the grinding disc reducer; the power output by the grinding disc motor is reduced by the grinding disc reducer and drives the grinding disc to rotate actively. The grinding roller and the grinding disc rotate respectively and cooperate with each other to actively bite the material into the gap between the grinding roller and the grinding disc; The vertical roller mill also includes a pressure assembly. The first end of the upper rocker arm of the pressure assembly is fixed to the outer surface of the grinding roller shaft. The second end of the upper rocker arm is fixedly connected to the first end of the lower rocker arm through a rocker arm shaft. The second end of the lower rocker arm is hinged to a hydraulic cylinder. Under the contraction of the hydraulic cylinder, the grinding roller is driven to rotate around the center line of the rocker arm shaft.

3. A vertical roller mill according to claim 2, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, Each pressurizing component includes a corresponding limiting component; the first end of the limiting component is fixed to the side wall of the concrete support, and the second end of the limiting component abuts against the corresponding lower rocker arm; the limiting component includes a lead screw, a slider, and a through cover; the inner surface of the slider is connected to the inner surface of the lead screw by a T-shaped thread; the through cover is fixed to the concrete support, and the slider is installed inside the through cover; A disc spring is provided at one end of the lead screw near the concrete support, and a counter-thrust force is generated when the lead screw compresses the disc spring. The lead screw is equipped with a handle. Rotating the handle can adjust the distance between the rocker arm and the lead screw to adjust the minimum gap between the grinding roller and the grinding disc, and avoid direct contact between the grinding roller and the grinding disc.

4. A vertical roller mill according to claim 2, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, The grinding roller coupling is a high-elasticity rubber coupling.

5. A vertical roller mill according to claim 2, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, A first reduction gear is provided between the grinding roller motor and the grinding roller coupling. The first reduction gear is a single-stage bevel gear reducer with a reduction ratio of 1 to 2.

6. A vertical roller mill according to claim 2, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, The input shaft of the first speed reduction device is coaxial with the center line of the grinding roller motor, and the output shaft of the first speed reduction device is coaxial with the center line of the grinding roller.

7. A vertical roller mill according to claim 2, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, The center line of the rocker arm shaft is parallel to the center line of the grinding roller motor, and the center line of the rocker arm shaft is perpendicular to the center line of the grinding roller.

8. A vertical roller mill according to claim 2, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, Both the grinding roller motor and the grinding disc motor are variable frequency motors, which can adjust the rotational speed of the grinding disc and the grinding roller respectively.

9. A vertical roller mill according to claim 3, wherein both the grinding roller and the grinding disc are actively rotating components, characterized in that, The two adjacent concrete supports are integrally cast using a concrete connecting bridge.

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