Distributed driving vertical roller mill with scattering and sorting device

Abstract

According to the distributed driving vertical roller mill containing the scattering and sorting device, the main roller and the auxiliary roller are respectively driven by different driving devices to actively rotate, and the friction force of the rotation of the main roller to materials drives the millstone to actively bite the materials. According to the vertical roller mill, the scattering and sorting device is arranged between the main roller and the auxiliary roller, materials milled by the main roller are loosened, and fine powder in the loosened materials is sorted out, so that the content of the fine powder in a material layer is reduced, the problem that the material layer is unstable is solved, the stability and the grinding efficiency of the mill are improved, and the competitiveness of the vertical roller mill is enhanced. In addition, a two-stage planetary structure is adopted in a driving device adopted by a main roller and an auxiliary roller in the vertical roller mill, large torque can be guaranteed while the transmission efficiency is improved, the structure is more compact, more grinding rollers can be arranged on one grinding disc, and the capacity of the mill can be further improved.

Description

Technical Field

[0001] The invention relates to the field of vertical roller mill equipment, and more specifically to a distributed drive vertical roller mill with a breaking and sorting device. Background Art

[0002] Vertical roller mill is a grinding equipment that integrates grinding, drying and powder selection. It is widely used in grinding cement, raw materials, coal powder and other materials. However, with the technological progress of roller press in recent years, its power consumption for grinding raw materials is significantly lower than that of vertical roller mill. Generally, the power consumption of the main machine of vertical roller mill is about 0.8Kwh / t higher than that of roller press when grinding the same material, which leads to a significant reduction in the competitiveness of vertical roller mill.

[0003] From the perspective of grinding mechanism, both vertical roller mill and roller press are material bed grinding, but the vertical roller mill has poor controllability of the material layer, and can only rely on the retaining ring to adjust the stability of the material layer and the grinding efficiency. However, if the retaining ring is increased, the material layer becomes thicker, which will lead to low grinding efficiency; if the retaining ring is reduced, the material layer becomes thinner, the grinding efficiency is high, but it will cause large vibration of the mill. The roller press uses two rollers that rotate in opposite directions and synchronously. The material is actively bitten into the grinding area for grinding under the friction of the two actively rotating rollers. Its stability is better than that of the vertical roller mill, so a larger roller pressure can be used, and the grinding efficiency is relatively high. Compared with the roller press, the existing vertical roller mills all have the grinding disc actively rotating, and the material on the grinding disc produces friction on the grinding roller. The grinding roller is passively rotating. There is inevitably a problem of material accumulation at the front end of the feeding of the grinding roller. Especially when the material layer is thick, the problem of material accumulation is more obvious, which will destroy the stability of the material layer, increase the vibration of the mill, and is not conducive to increasing the pressure of the grinding roller. The grinding efficiency is lower than that of the roller press, and the power consumption of a single machine is higher.

[0004] The large-scale vertical mill requires a larger motor power and a torque reducer. The difficulty of large-scale mill is that the manufacturing of high-power motors and reducers is more difficult, especially the manufacturing of large spiral caps is very difficult, and the cost is greatly increased. For the same vertical mill to grind different materials, the speed of the grinding disc needs to be adjusted, but the inverter of the high-power motor is too difficult to manufacture. The motor basically uses a constant speed, and the vertical mill has low adaptability to grinding a variety of materials.

[0005] Chinese Patent Publication No. CN117427732A discloses a roller-driven vertical roller mill and a grinding method thereof, which belongs to the field of vertical roller mill equipment. However, the patent adopts a primary planetary structure, which has low transmission efficiency and a limited reduction ratio adjustment range, so that the improvement of the grinding capacity of the vertical roller mill is subject to certain restrictions.

[0006] According to the discrete element simulation analysis of the material on the grinding disc of the vertical roller mill, the material on the grinding disc can be divided into area one, area two, and area three. Area one is the material that can enter the bottom of the grinding roller for grinding and has not yet been ground; area two is the bypass material, that is, the material that has been thrown out without being ground and cannot be ground; area three is the material that has been ground by the grinding roller.

[0007] The material in area 1 is piled up in front of the grinding roller. This is determined by the characteristics of conventional vertical roller mills. The grinding disc rotates actively, and the grinding roller rotates under the friction of the material. It is a passive rotation and cannot actively bite into the material, especially the material that is easy to grind. The vibration of the mill is large.

[0008] Theoretically, the smaller the material in area 2, the better. However, as the size of the mill increases, the distance between two adjacent grinding rollers also increases, resulting in a larger bypass volume, which in turn increases the ineffective circulation volume inside the mill and increases the circulation load inside the mill, resulting in reduced mill running time and increased power consumption.

[0009] The materials in area 3 are ground by the rollers, so there are a lot of fine powders in the material layer. The conventional design is to lift the materials on the grinding disc by the air ring at a certain angle, but due to the existence of the retaining ring, the fine powders at the bottom of the material layer are difficult to be lifted for sorting. After analysis, the content of fine powders ≤80um in area 3 is higher than 25%. A lot of fine powders remain in the material layer, which will destroy the stability of the material layer, increase the vibration of the mill, and are not conducive to increasing the pressure of the grinding roller.

[0010] To improve the grinding efficiency of the vertical roller mill, it is necessary to solve the problem of material accumulation in area one, reduce the problem of large amount of bypass material in area two, and the problem of large amount of fine powder residue in area three. Summary of the invention

[0011] The invention provides a distributed drive vertical roller mill with a breaking and sorting device, which is used to solve the problems of unstable material layer, limited speed reduction ratio adjustment range, difficulty in improving the grinding capacity of the vertical roller mill, low grinding efficiency and bypass material amount in the prior art.

[0012] The present invention provides a distributed drive vertical roller mill with a breaking and sorting device, comprising a plurality of main grinding devices and a plurality of auxiliary grinding devices of the same number, and a grinding disc;

[0013] The main grinding device comprises a main roller, a main driving device, and a main pressurizing assembly; the main grinding device is driven to rotate actively by the main driving device; the main driving device comprises a main roller motor, a main roller coupling, a main roller transmission shaft, and a main reduction device connected in sequence; the main roller transmission shaft is rotatably arranged in the main roller shaft; the main pressurizing assembly is used to apply pressure to the main roller so that the material is pre-compressed and crushed between the main roller and the grinding disc;

[0014] The auxiliary grinding device comprises an auxiliary roller, an auxiliary driving device, and an auxiliary pressurizing assembly; the auxiliary grinding device is driven to rotate actively by the auxiliary driving device; the auxiliary driving device comprises an auxiliary roller motor, an auxiliary roller coupling, an auxiliary roller transmission shaft, and an auxiliary reduction device connected in sequence; the auxiliary roller transmission shaft is rotatably arranged in the auxiliary roller shaft; the auxiliary pressurizing assembly is used to apply pressure to the auxiliary roller so that the material is ground between the auxiliary roller and the grinding disc;

[0015] The grinding disc is driven to rotate by a grinding disc driving device; the main reduction device and the auxiliary reduction device are both two-stage planetary structures;

[0016] A scattering and sorting device is arranged between the main roller and the auxiliary roller and close to the downstream of each main roller rotating and grinding the material, and the scattering and sorting device is used to loosen the material after the main roller grinding and compacting and to sort the fine powder therein;

[0017] The main roller and the auxiliary roller are located in the mill shell and are distributed on the millstone in staggered circles, so that an auxiliary roller is arranged between every two main rollers, and the auxiliary roller is used for pre-compression and crushing of bypass materials between the two main rollers; the distance between the auxiliary roller and its upstream adjacent main roller is greater than the distance between the auxiliary roller and its downstream adjacent main roller, and the gap between the auxiliary roller and the lining plate on the millstone is greater than the gap between the main roller and the lining plate.

[0018] Optionally, the scattering and sorting device includes an air duct, a support frame, a group of scatterers and a group of nozzles;

[0019] The induced air pipe is hollow and radially arranged above the grinding disc; the end of the induced air pipe away from the center of the grinding disc is the first end; the first end of the induced air pipe is fixed on the middle shell of the vertical roller mill, and the middle part of the induced air pipe is supported by a support frame arranged above the air ring;

[0020] The portion of the air duct located in the grinding zone is provided with a group of spaced-apart scatterers used to loosen the materials in the grinding zone; the scatterers include a scattering head and a scattering rod, the first end of the scattering rod is fixed to the side wall of the air duct, and the second end of the scattering rod is the scattering head;

[0021] The scrambling head comprises a base, two side wings and a vertically arranged front blade; the front blade is detachably fixed to the base, and the tip of the front blade is located at the front end of the material-facing side of the scrambling head; the two side wings are located on both sides of the front blade.

[0022] Optionally, the end of the air duct close to the center of the grinding disc is the second end; the end surface of the second end of the air duct is closed; the end surface of the first end of the air duct is an opening for introducing compressed air into the air duct;

[0023] The induced draft duct is also provided with a group of nozzles staggered with the scrambler rods. The nozzles are connected to the interior of the induced draft duct and are located downstream of the scrambler. The outlets of the nozzles are directed upward away from the grinding disc, so as to lift the materials ground on the grinding disc and loosened by the scrambler, and to sort the fine powder.

[0024] Optionally, a material stop ring is further provided at the outer diameter of the grinding disc, and the distance L1 between the scatterer away from the center of the grinding disc and the material stop ring is in the range of 100 to 200 mm;

[0025] The distance L2 between two adjacent scatterers is in the range of 0.8 to 1 times of L1;

[0026] The number n of the scatterers ranges from 6 to 8;

[0027] The vertical distance H1 between the bottom of the scatterer and the lining plate is in the range of 20 to 30 mm.

[0028] Optionally, the angle α between the bottom end surface of the front blade and the horizontal plane is in the range of 5° to 10°;

[0029] The included angle β between the front blade material-confronting end surface and the horizontal plane is in the range of 45° to 50°.

[0030] Optionally, the angle γ between the centerline of the wing and the horizontal plane ranges from 25° to 35°;

[0031] The angle ε between the flank center lines of the two flanks is in the range of 25° to 35°;

[0032] The height H2 of the vertex of the center line of the side wing from the lowest end of the front blade is in the range of 40 to 70 mm;

[0033] The height H3 between the top and bottom of the front blade is in the range of 120 to 200 mm.

[0034] Optionally, the rotation speed of the main roller is in the range of 40 to 60 rpm, and the reduction ratio of the main reduction device is in the range of 15 to 25;

[0035] The rotation speed range of the auxiliary roller is 50-70 rpm, and the reduction ratio range of the auxiliary reduction device is 14-20.

[0036] Optionally, each of the main grinding devices is supported by a concrete support, and two adjacent concrete supports are connected by the concrete connecting bridge; the auxiliary rocker arm shaft in the auxiliary pressure assembly can be rotatably fixed on the auxiliary roller rocker arm support on the top surface of the connecting bridge, and the second end of the auxiliary roller cylinder is hinged to the auxiliary roller cylinder support fixed on the side wall of the connecting bridge.

[0037] Optionally, the central axis of the main roller motor is coaxial with the central axis of the main roller, and the angle δ with the horizontal plane is in the range of 15° to 20°; the central axis of the auxiliary roller motor is coaxial with the center line of the auxiliary roller, and the angle δ with the horizontal plane is.

[0038] Optionally, the main roller motor, the auxiliary roller motor and the grinding disc motor are all variable frequency motors, which can adjust the rotation speeds of the main roller, the auxiliary roller and the grinding disc respectively.

[0039] The present invention has at least the following beneficial effects:

[0040] The present invention provides a distributed drive vertical roller mill containing a breaking and sorting device, in which the main roller and the auxiliary roller are driven by different driving devices to actively rotate, and the friction force of the main roller on the material drives the grinding disc to actively bite into the material. A breaking and sorting device is arranged between the main roller and the auxiliary roller, and the material ground by the main roller is loosened and the fine powder in the loose material is sorted out, thereby reducing the content of fine powder in the material layer and solving the problem of unstable material layer, thereby improving the stability and grinding efficiency of the mill and enhancing the competitiveness of the vertical roller mill. In addition, the driving device used for the main roller and the auxiliary roller in the vertical roller mill adopts a two-stage planetary structure, which can improve the transmission efficiency while ensuring a larger torque, and the structure is more compact. More grinding rollers can be arranged on one grinding disc, which is conducive to further improving the capacity of the mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of a distributed drive vertical roller mill with a breaking and sorting device provided in an embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of a distributed drive vertical roller mill with a breaking and sorting device provided in an embodiment of the present invention;

[0044] Figure 3 It is a front view of a dispersing and sorting device of a distributed drive vertical roller mill including a dispersing and sorting device provided by an embodiment of the present invention;

[0045] Figure 4 This is a diagram of a dispersing and sorting device of a distributed drive vertical roller mill including a dispersing and sorting device provided by an embodiment of the present invention;

[0046] Figure 5 It is an axonometric diagram of a dispersing and sorting device of a distributed drive vertical roller mill including a dispersing and sorting device;

[0047] Figure 6 It is a side view of a scattering and sorting device of a distributed drive vertical roller mill containing a scattering and sorting device provided by an embodiment of the present invention;

[0048] Figure 7 It is a top view of a scattering and sorting device of a distributed drive vertical roller mill containing a scattering and sorting device provided by an embodiment of the present invention;

[0049] Figure 8 It is a cross-sectional view of a distributed drive vertical roller mill with a breaking and sorting device provided by an embodiment of the present invention;

[0050] Fig. 9 It is a cross-sectional view of a main roller of a distributed drive vertical roller mill with a breaking and sorting device provided in an embodiment of the present invention;

[0051] Fig.10 This is a diagram of a main reduction device of a distributed drive vertical roller mill with a breaking and sorting device provided by an embodiment of the present invention;

[0052] Fig.11 It is a cross-sectional view of a main roller of a distributed drive vertical roller mill containing a breaking and sorting device provided in an embodiment of the present invention.

[0053] Reference numerals:

[0054] 1. Main roller; 2. Scattering and sorting device; 3. Auxiliary roller; 4. Air ring; 5. Grinding disc; 6. Scatterer; 6a. Scattering head; 6b. Scattering rod; 7. Nozzle; 8. Lining plate; 9. Material retaining ring; 10. Support frame; 11. Air duct; 12. Middle shell; 13. Base; 14. Hexagon socket bolt; 15. Front blade; 16. Side wing; 16a. Side wing center line; 17. Main roller motor; 18. Main shaft coupling; 19. Main roller transmission shaft; 20. Main reduction device; 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, inner gear ring seat; 215a, second inner gear ring; 215b, first inner gear ring; 216, third self-aligning bearing; 217, connecting frame; 21, auxiliary reduction device; 22, auxiliary roller transmission shaft; 23, auxiliary roller coupling; 24, auxiliary roller motor; 25, grinding disc motor; 26, auxiliary roller cylinder; 27, concrete connecting bridge; 28, grinding disc reducer; 29, main roller cylinder; 30, concrete bracket; 31, main roller shaft; 32, auxiliary roller shaft; 33, limit assembly; 331, lead screw; 332, handle; 333, slider; 334, transparent cover; 335, disc spring; 34, auxiliary roller cylinder support;

[0055] A. Area three; B. Area two; C. Area one. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] like Figures 1 to 11 As shown, the present invention provides a distributed drive vertical roller mill with a scattering and sorting device; it includes a plurality of main grinding devices and a plurality of auxiliary grinding devices of the same number, and a grinding disc 5;

[0058] The main grinding device comprises a main roller 1, a main driving device, and a main pressurizing assembly; the main grinding device drives the main grinding device to rotate actively; the main driving device comprises a main roller motor 17, a main roller coupling 18, a main roller transmission shaft 19, and a main reduction device 20 connected in sequence; the main roller transmission shaft 19 is rotatably arranged in the main roller shaft 31; the main pressurizing assembly is used to apply pressure to the main roller 1, so that the material is pre-pressed and crushed between the main roller 1 and the grinding disc 5;

[0059] The auxiliary grinding device comprises an auxiliary roller 3, an auxiliary driving device, and an auxiliary pressure component; the auxiliary grinding device is driven to rotate actively by the auxiliary driving device; the auxiliary driving device comprises an auxiliary roller motor 24, an auxiliary roller coupling 23, an auxiliary roller transmission shaft 22 and an auxiliary reduction device 21 connected in sequence; the auxiliary roller transmission shaft 22 is rotatably arranged in the auxiliary roller shaft 32; the auxiliary pressure component is used to apply pressure to the auxiliary roller so that the material is ground between the auxiliary roller and the grinding disc; the grinding disc 5 is driven to rotate by the grinding disc 5 driving device; the main reduction device 20 and the auxiliary reduction device 21 are both two-stage planetary structures;

[0060] A scattering and sorting device 2 is provided between the main roller 1 and the auxiliary roller 3 and close to the downstream of each main roller 1 rotating and grinding the material, and the scattering and sorting device 2 is used to loosen the material after the main roller 1 grinds and compacts it and sort the fine powder therein;

[0061] The main roller 1 and the auxiliary roller 3 are located in the mill shell and are distributed in staggered circles on the grinding disc 5, so that an auxiliary roller 3 is arranged between every two main rollers 1, and the auxiliary roller 3 is used for pre-compression and crushing of bypass materials between the two main rollers 1; the distance between the auxiliary roller 3 and its upstream adjacent main roller 1 is greater than the distance between the auxiliary roller 3 and its downstream adjacent main roller 1, and the gap between the auxiliary roller 3 and the lining plate 8 on the grinding disc 5 is greater than the gap between the main roller 1 and the lining plate 8.

[0062] Specifically, the vertical roller mill includes an auxiliary grinding device for pre-compacting and crushing the material on the grinding disc 5 and a main grinding device for further grinding the pre-compacted material. An auxiliary roller 3 is arranged between every two main rollers 1, and the rotation direction of the auxiliary roller 3 is the same as that of the main roller 1. The auxiliary roller 3 is located at 0.5 to 0.7 between two adjacent main rollers 1.

[0063] The main roller 1 and the auxiliary roller 3 are located in the mill shell and are staggered and distributed on the grinding disc 5, so that an auxiliary roller 3 is set between every two main rollers 1. The auxiliary roller 3 is used to pre-compact and crush the bypass material between the two main rollers 1, give full play to the role of the auxiliary roller in spreading and compacting the material, optimize the material supply to the main roller, reduce the amount of bypass material, and improve the stability of the material layer. Among them, the speed of the main roller 1 is n M , the speed of auxiliary roller 3 is n S , the grinding wheel speed is nT . In the present invention, the number of main rollers 1 and auxiliary rollers 3 is multiple, which are designed and arranged according to actual production needs. The main rollers 1 and auxiliary rollers 3 are all arranged in the mill shell, staggered and circumferentially distributed on the grinding disc 5, and the main rollers 1, auxiliary rollers 3, and grinding disc 5 are all active rotating parts. The gap between the auxiliary roller 3 and the grinding disc 5 is greater than the gap between the auxiliary roller 3 and the grinding disc 5. In the present application, the number of main rollers 1 and auxiliary rollers 3 is three, and other numbers of main rollers 1 and auxiliary rollers 3 can also be set according to needs in other embodiments.

[0064] A dispersing and sorting device 2 is arranged between the main roller 1 and the auxiliary roller 3 and near the downstream of each main roller 1 rotating and grinding the material, to loosen the material after the main roller 1 grinding and compacting, and lift the loosened material, so that the coarse particles fall on the grinding disc 5 for further grinding, and the fine powder enters the sorting machine with the airflow, thereby realizing the sorting of the fine powder in the material compacted by the main roller 1. Among them, the downstream of the material ground by the main roller 1 is area three A, the area between the dispersing and sorting device 2 and the material-facing side of the auxiliary roller 3 is area two B, and the area between the downstream of the auxiliary roller 3 and the material-facing side of the adjacent main roller 1 is area one C. Area one C is the material that can enter the grinding roller below the main roller 1 for grinding and has not yet been ground; the material in area two B is the bypass material, that is, the material that is thrown out under the centrifugal force of the grinding disc 5 without being ground and cannot be ground; area three A is the material ground by the grinding roller. By arranging a breaking device downstream of the main roller 1, the compacted material is "loosened", and by introducing external compressed air through the induced draft pipe 11, the wind sprayed from a group of nozzles 7 increases the wind speed on the broken material layer to lift and sort the loose material, thereby increasing the sorting efficiency of the fine powder on the grinding disc 5, reducing the fine powder remaining on the material layer, creating a loose material bed that is conducive to grinding, and improving the grinding efficiency.

[0065] The main roller 1 is driven to rotate actively by the main drive device, wherein the main roller motor 17 outputs power, which is transmitted to the main roller drive shaft 19 through the main roller coupling 18, and then transmitted to the main reduction device 20 through the main roller drive shaft 19. The main reduction device 20 is a two-stage planetary mechanism, which is connected to the main roller 1 and converts most of the speed transmitted by the main roller drive shaft 19 into torque and transmits it to the main roller 1 to rotate it. The main reduction device 20 is arranged at one end of the main roller 1 near the center of the grinding disc 5. The main pressure component is the main roller cylinder 29, which is telescopic and drives the main roller 1 to rotate around the axis of the main roller rocker pin through the principle of leverage.

[0066] In the present application, the main reduction device 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 main roller transmission shaft 19, and is coaxially connected to the main roller transmission shaft 19 by a spline, thereby transmitting the power of the main roller transmission shaft 19 to the first sun gear 213. A plurality of first planetary gears 201 are arranged in the first planetary carrier 208, each of which is meshed with the first sun gear 213 and the first inner gear ring 215b, and the first inner gear ring 215b and the second inner gear ring 215a are both fixed in the inner gear ring seat 215, and the inner gear ring seat 215 is fixed on the connecting frame 217. A first planetary gear shaft 203 is arranged in each first planetary gear 201. The first planetary gear 201 is rotatably arranged on the first planetary gear shaft 203 through a first planetary gear bearing 202. The first planetary gear bearing 202 is a sliding bearing. The first planetary gear shaft 203 is fixedly connected to the first planetary carrier 208. Power is transmitted to the first planetary carrier 208 through the first planetary gear shaft 203.

[0067] The first side of the second sun gear 211 is mounted on the outer surface of the end of the main roller transmission shaft 19 through 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. Among them, the step with a smaller outer surface diameter is the first outer gear ring of the second sun gear, and the first outer gear ring of the second sun gear is an outer drum-shaped tooth. The step with a larger outer surface diameter is the second outer gear ring of the second sun gear. The inner drum-shaped tooth of the first planet carrier 208 meshes with the first outer gear ring of the second sun gear. A plurality of second planetary gears 204 are fixed in the second planetary carrier 207, and a second planetary gear shaft 206 is arranged inside each second planetary gear 204. The second planetary gear 204 is rotatably arranged on the second planetary gear shaft 206 through the second planetary gear bearing 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 positioning pins, the power of the second planetary transmission stage is finally output on the output flange 214. The end of the second sun gear 211 away from the first sun gear 213 is provided with a first self-aligning bearing 210, 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 the present application, the number of the first planetary gears 201 is 3, and the number of the second planetary gears 204 is 3 or 4. 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. The first planetary transmission stage and the second planetary transmission stage in this embodiment are both in a floating and evenly loaded state, and only bear torque. The main roller transmission shaft 19 transmits power through a two-stage planetary transmission mechanism, which is conducive to improving the 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.

[0068] The main reduction gear 20 is located inside the main roller 1. The output flange 214 in the main reduction gear 20 is fixedly connected to the end face of the main roller. The power of the main reduction gear 20 is output to the output flange 214, and is output to the main roller 1 through the output flange 214, and is converted into the torque of the main roller 1. The main reduction gear 20 is connected and fixed to one end of the main roller shaft 31 close to the center of the grinding disc 5 through the connecting frame 217, and a third self-aligning bearing 216 is arranged between the connecting frame 217 and the main roller transmission shaft 19. The main roller transmission shaft 19 is rotatably fixed on the main roller shaft 31 through the third self-aligning bearing 216 and the connecting frame 217. Since the connecting frame 217 is fixedly connected to one end of the main roller shaft 31, and the first planetary transmission stage and the second planetary transmission stage are both in a floating load-balancing state and only bear torque, the grinding pressure vertical vibration load of the main roller 1 can be separated from the power transmission gear load, so that the main roller 1 side reduction mechanism has high reliability and long service life. In addition, the main reduction device 20 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 main roller transmission shaft 19, thereby reducing the size of the main roller shaft 31 and the bearing, which is conducive to reducing the cost of the equipment. The two-stage planetary structure is located inside the main roller 1, has a large reduction ratio and load-bearing capacity, can reduce the torque and mass load of the upstream transmission system, so that the required transmission structure is small and the cost is low.

[0069] The auxiliary roller 3 is driven to rotate actively through the auxiliary driving device, wherein the auxiliary roller motor 24 outputs power, and the auxiliary roller 3 transmits the power to the auxiliary roller transmission shaft 22, and then transmits it to the auxiliary reduction device 21 through the auxiliary roller transmission shaft 22. The auxiliary roller transmission shaft 22 is rotatably arranged in the auxiliary roller shaft 32. The auxiliary reduction device 21 is connected to the auxiliary roller 3, and converts part of the rotation speed transmitted by the auxiliary roller transmission shaft 22 into torque and transmits it to the auxiliary roller 3 to rotate it. The auxiliary reduction device 21 is also a two-stage planetary transmission mechanism, which is similar to the transmission principle of the main reduction device 20. The auxiliary reduction device 21 is arranged at one end of the auxiliary roller 3 near the center of the grinding disc 5. The grinding disc motor 25 in the grinding disc driving device transmits power to the grinding disc reducer 28 through a coupling, and converts part of the rotation speed into torque and transmits it to the grinding disc 5 through the grinding disc reducer 28, driving the grinding disc 5 to rotate actively.

[0070] In the present invention, the main roller coupling 18 is a flexible coupling, and the flexible coupling is preferably a highly elastic rubber coupling, which is used to compensate for the deviation between the grinding roller and the motor shaft when the grinding roller swings, as well as the vibration and impact during the transmission process. The flexible coupling provides an elastic connection between the motor and the transmission shaft, which can absorb and buffer the vibration and impact force generated by the operation of the motor, thereby protecting the motor and the transmission shaft, reducing the vibration and noise of the mechanical system, and extending the life of mechanical parts. In addition, the flexible coupling can accept a larger shaft deviation and angle deviation, so as to adapt to operation under different conditions and improve transmission accuracy. During the installation process of the motor and the transmission shaft, even if there are slight deviations, the flexible coupling can absorb and compensate for these deviations through its own deformation to ensure a smooth connection between the motor and the transmission shaft.

[0071] In the present invention, the first end of the upper rocker arm of the main pressure assembly is fixed to the outer surface of the main roller shaft, the second end of the upper rocker arm is connected to the first end of the lower rocker arm through the main roller rocker arm shaft, the second end of the lower rocker arm is hinged to the first end of the main roller cylinder 29, and the second end of the main roller cylinder 29 is fixed; under the contraction of the main roller cylinder 29, the main roller 1 is driven to rotate around the central axis of the main roller rocker arm shaft;

[0072] The first end of the auxiliary roller rocker arm in the auxiliary pressure assembly is fixed to the outer surface of the auxiliary roller shaft, the second end of the auxiliary roller rocker arm is hinged to the first end of the auxiliary roller cylinder 26, and the second end of the auxiliary roller cylinder 26 is fixed; under the contraction of the auxiliary roller cylinder 26, the auxiliary roller 3 is driven to rotate around the central axis of the auxiliary roller rocker arm shaft.

[0073] In the present invention, each of the main pressurizing components includes a corresponding limiter component 33; the first end of the limiter component 33 is fixed to the side wall of the concrete support 30, and the second end of the limiter component 33 supports the corresponding lower rocker arm;

[0074] The limiting assembly 33 includes a lead screw 331, a slider 333 and a transparent cover 334; the inner surface of the slider 333 is connected to the inner surface of the lead screw 331 through a T-shaped thread; the transparent cover 334 is fixed to the concrete support 30, and the slider 333 is installed in the transparent cover 334;

[0075] A group of disc springs 335 are arranged at one end of the lead screw 331 close to the concrete support 30, and a reverse thrust is formed when the lead screw 331 squeezes the disc springs 335;

[0076] The lead screw 331 is provided with a handle 332 , and the handle 332 can be rotated to adjust the distance between the rocker arm and the lead screw 331 so as to adjust the minimum gap between the main roller 1 and the grinding disc 5 .

[0077] Specifically, a limit assembly 33 is provided on the concrete support 30 on one side of the lower rocker arm of the main pressure assembly, and the limit assembly 33 is horizontally installed on the side wall of the concrete. The limit assembly 33 includes a lead screw 331, a slider 333 and a transparent cover 334, wherein the slider 333 is sleeved on the outer surface of the lead screw 331, and the slider 333 is connected to the surface of the lead screw 331 through a T-shaped thread. The transparent cover 334 is fixed on the concrete support 30, and the slider 333 is installed in the transparent cover 334. A handle 332 is provided on the lead screw 331. When the handle 332 is turned clockwise or counterclockwise, the lead screw 331 and the slider 333 move horizontally relative to each other through the T-shaped thread. The distance between the lower rocker arm and the lead screw 331 is adjusted in time during different wear periods of the main roller 1 to adjust the minimum gap between the main roller 1 and the grinding disc 5 during different production periods, so as to ensure that the roller gap height between the main roller 1 and the grinding disc 5 is always 30-50 mm. The roller gap height is 50%-70% of the material layer thickness. A set of disc springs 335 are arranged at one end of the lead screw 331 close to the concrete support 30. The disc springs 335 are washer-type springs with a truncated cone cross section made of metal sheet or forged blank, and have a certain compression distance. When the lead screw 331 presses the disc springs 335, a reverse thrust is generated.

[0078] Under the action of the main roller cylinder 29, when the lower rocker arm is pushed out toward the side of the limit assembly 33, the maximum push-out distance adjusted by the lead screw 331 is the longest compression distance of the disc spring 335, which is the minimum gap between the grinding disc 5 and the main roller 1. The limit assembly 33 can prevent the main roller cylinder 29 from pulling too much, causing the main roller 1 to contact with the grinding disc 5 and cause damage.

[0079] In a possible implementation, the scattering and sorting device 2 includes an air duct 11, a support frame 10, a group of scatterers 6 and a group of nozzles 7;

[0080] The induced air pipe 11 is hollow and radially arranged above the grinding disc 5; the end of the induced air pipe 11 away from the center of the grinding disc 5 is the first end; the first end of the induced air pipe 11 is fixed on the middle shell 12 in the vertical roller mill, and the middle part of the induced air pipe 11 is supported by a support frame 10 arranged above the air ring 4;

[0081] The portion of the air duct 11 located in the grinding zone is provided with a group of spaced-apart scatterers 6 for loosening the materials in the grinding zone; the scatterers 6 include a scattering head 6a and a scattering rod 6b, the first end of the scattering rod 6b is fixed to the side wall of the air duct 11, and the second end of the scattering rod 6b is the scattering head 6a;

[0082] The scattering head 6a includes a base 13, two side wings 16 and a vertically arranged front blade 15; the front blade 15 is detachably fixed to the base 13, and the tip of the front blade 15 is located at the front end of the material-facing side of the scattering head 6a; the two side wings 16 are located on both sides of the front blade 15.

[0083] Specifically, the scatterers 6 are evenly arranged and fixed to the induced draft pipe 11 by hexagon socket bolts 14. The induced draft pipe 11 is radially fixed to the inner side of the middle shell 12. One end of the induced draft pipe 11 is supported by the middle shell 12. The part of the induced draft pipe 11 located above the air ring 4 is supported by the support frame 10, which further realizes the fixation of the induced draft pipe 11. The front blade 15 of the scattering head 6a is embedded in the clamping plate of the base 13 and is fixed to the base 13 by hexagon socket bolts 14, which is convenient for the replacement of the front blade 15. The tip of the front blade 15 is facing the material side, which is used to loosen the material after the main roller 1 is ground and compacted. The base 13 is also provided with side wings 16, and the two side wings 16 are symmetrically arranged on both sides of the front blade 15. The side wings 16 are used to loosen the material layer on both sides of the groove drawn by the front blade 15, reduce the forward resistance of the blade, and reduce power loss. Among them, the front blade 15 is preferably made of high manganese steel, which is tempered after sharpening to improve wear resistance. The base 13 and the side wings 16 are cast as one piece, preferably made of high chromium alloy cast iron.

[0084] In a possible implementation, the end of the air duct 11 close to the center of the grinding disc 5 is the second end; the end surface of the second end of the air duct 11 is closed; the end surface of the first end of the air duct 11 is an opening for introducing compressed air into the air duct 11;

[0085] The air duct 11 is also provided with a group of nozzles 7 arranged alternately with the scattering rods. The nozzles 7 are connected to the interior of the air duct 11 and are located downstream of the scatterer 6. The outlet of the nozzles 7 faces upward away from the grinding disc 5, lifts the material ground on the grinding disc 5 and loosened by the scatterer 6, and sorts the fine powder.

[0086] Specifically, the induced draft pipe 11 is a tube with only one end open, and compressed air enters the induced draft pipe 11 through the opening. A group of nozzles 7 are also arranged on the induced draft pipe 11 in the horizontal direction, and the group of nozzles 7 and the disperser 6 are arranged at intervals. The disperser 6 is fixedly arranged on the material-facing side of the induced draft pipe 11, and the nozzle 7 is located on the material-back side of the induced draft pipe 11, and the opening is upward and opposite to the material-facing side. The angle between the direction of the opening of the nozzle 7 and the horizontal plane is θ, and θ ranges from 45° to 60°. Compressed air is introduced from the outside of the vertical roller mill, passes through the induced draft pipe 11 and is blown out from the nozzle 7, and the material that has been ground on the grinding disc 5 and loosened by the disperser 6 is lifted, and the lifted fine powder enters the classifier, thereby classifying the fine powder and reducing the content of fine powder in the material layer.

[0087] In a possible implementation, a material stop ring 9 is further provided at the outer diameter of the grinding disc 5, and a distance L1 between the scatterer 6 away from the center of the grinding disc 5 and the material stop ring 9 is in a range of 100 to 200 mm;

[0088] The distance L2 between two adjacent scatterers 6 is in the range of 0.8 to 1 times of L1;

[0089] The number n of the scatterers 6 ranges from 6 to 8;

[0090] The vertical distance H1 between the bottom of the scatterer 6 and the lining plate 8 is in the range of 20 to 30 mm.

[0091] Specifically, the retaining ring 9 is used to reduce the material that falls from the grinding disc 5 into the air ring 4 without being ground. There is a certain distance L1 between the scatterer 6 closest to the retaining ring 9 and the retaining ring 9, and the range of L1 is 100-200mm, to prevent the distance from being too close and the loosened material from passing over the retaining ring 9. The vertical distance H1 between the bottom of the scatterer 6 and the lining plate 8 is in the range of 20-30mm, which ensures that there is an appropriate distance between the bottom of the scatterer 6 and the lining plate 8 while loosening the material after grinding and compacting the main roller 1 to the greatest extent, preventing the scatterer 6 from colliding or rubbing with the lining plate 8, thereby improving the stability and service life of the equipment.

[0092] A group

[0093] In a possible implementation manner, the angle α between the bottom end surface of the front blade 15 and the horizontal plane is in the range of 5° to 10°;

[0094] The included angle β between the material-confronting end surface of the front blade 15 and the horizontal plane is in the range of 45° to 50°.

[0095] Specifically, the angle α between the bottom end face of the front blade 15 and the horizontal plane is in the range of 5° to 10°, so that the front blade 15 can cut into the material at a smaller angle when contacting the material, which helps to reduce the resistance of the material during the process of being scattered, making the material easier to disperse. In addition, the angle β between the material-facing end face of the front blade 15 and the horizontal plane is in the range of 45° to 50°, so that the front blade 15 can push the material away at a more appropriate angle when facing the material, avoiding the material from re-aggregating after being scattered, thereby improving the dispersion effect of the material.

[0096] In a possible implementation, the angle γ between the wing centerline 16a and the horizontal plane is in the range of 25° to 35°, preferably 30°.

[0097] The angle ε between the wing center lines 16a of the two wing members 16 is in the range of 25° to 35°, preferably 30°.

[0098] The height H2 between the vertex of the wing centerline 16a and the lowest end of the front blade 15 is in the range of 40 to 70 mm, preferably 50 mm.

[0099] The height H3 between the top and bottom ends of the front blade 15 ranges from 120 to 200 mm, and the preferred distance is 150 mm.

[0100] In a possible implementation manner, the rotation speed of the main roller 1 is in the range of 40 to 60 rpm, and the reduction ratio of the main reduction device is in the range of 15 to 25;

[0101] The rotation speed of the auxiliary roller 3 is in the range of 50-70 rpm, and the reduction ratio of the auxiliary reduction device is in the range of 14-20.

[0102] In a possible embodiment, each of the main grinding devices is supported by a concrete support 30, and two adjacent concrete supports 30 are connected by the concrete connecting bridge 27; the auxiliary rocker arm shaft in the auxiliary pressure assembly is fixed to the auxiliary roller rocker arm support on the top surface of the connecting bridge 27, and the second end of the auxiliary roller cylinder 26 is hinged to the auxiliary roller cylinder support 34 fixed on the side wall of the connecting bridge 27.

[0103] Specifically, two adjacent concrete supports 30 are connected by a concrete connecting bridge 27, which has better stability. An auxiliary roller rocker arm support is fixed on the top surface of the connecting bridge 27, and the auxiliary rocker arm shaft of the auxiliary pressure assembly is rotatably fixed on the auxiliary roller rocker arm support. An auxiliary roller cylinder support 34 is fixed on the side of the connecting bridge 27 away from the center of the grinding disc 5, and the second end of the auxiliary roller cylinder 26 is hinged to the auxiliary roller cylinder support 34.

[0104] In a possible embodiment, the central axis of the main roller motor 17 is coaxial with the central axis of the main roller 1, and the angle δ with the horizontal plane is in the range of 15° to 20°; the central axis of the auxiliary roller motor is coaxial with the center line of the auxiliary roller, and the angle δ with the horizontal plane is.

[0105] Specifically, the central axis of the main roller motor 17 is coaxial with the central axis of the main roller 1. This direct drive method reduces energy loss during transmission and improves transmission efficiency. The central axis of the auxiliary roller motor 24 is also coaxial with the central axis of the auxiliary roller 3, and the angle between the central axis of the auxiliary roller motor 24 and the horizontal plane is also δ. The main roller motor 17 and the auxiliary roller motor 24 are both arranged at an angle, and a thrust bearing capable of bearing axial force is provided on the motor shaft; the central axis of the auxiliary roller motor 24 is coaxial with the central axis of the auxiliary roller 3, and the angle between the central axis and the horizontal plane is δ; the auxiliary roller motor is arranged at an angle, and a thrust bearing capable of bearing axial force is provided on the motor shaft.

[0106] In a possible implementation, the main roller motor 17 , the auxiliary roller motor 24 , and the grinding disc motor 25 are all variable frequency motors, which can adjust the rotation speeds of the main roller 1 , the auxiliary roller 3 , and the grinding disc 5 , respectively.

[0107] Specifically, the main roller motor 17, the auxiliary roller motor 24 and the grinding disc motor 25 are all variable frequency motors, which can adjust different rotation speeds and output powers for different materials to improve energy utilization.

[0108] Example

[0109] The material is fed from above the center of the grinding disc 5. The grinding disc 5 is driven by the grinding disc motor 25 and the grinding disc reducer 28 to rotate actively, so that the material falling from above the center of the grinding disc 5 onto the grinding disc 5 forms a material layer on the grinding disc 5 and moves toward the edge of the grinding disc 5. The main roller 1 is driven by the main roller motor 17, the main roller coupling 18, the main roller transmission shaft 19, and the main reduction device 20. The main roller 1 applies grinding pressure to the material on the liner 8 under the action of the main roller cylinder 29, and the main roller 1 and the liner 8 are rollingly combined. The auxiliary roller 3 is driven by the auxiliary roller motor 24, the auxiliary roller coupling 23, the auxiliary roller transmission shaft 22, and the auxiliary reduction device 21. The auxiliary roller 3 pre-compacts the material on the liner 8 under the action of the auxiliary roller cylinder 26 to reduce the bypass material between the two adjacent main rollers 1. The compacted material after grinding by the main roller 1 is loosened under the action of a group of scatterers 6. Compressed air is introduced from the outside of the mill, blown out from a group of nozzles 7 through the induced draft pipe 11, and the loosened material is lifted and sorted once, reducing the problem of unstable material layer with high fine powder content. The main roller 1, auxiliary roller 3, and grinding disc 5 are all distributed drive vertical roller mills with active rotating parts. The main roller 1 and auxiliary roller 3 have strong material feeding capacity, which solves the problem of material accumulation, making the material layer stable and running smoothly. Compared with the conventional grinding disc 5 driven vertical mill, the grinding pressure of the grinding roller is large and has a higher grinding efficiency.

[0110] In summary, the present invention has the following beneficial effects:

[0111] The main roller, auxiliary roller and grinding disc are all active rotating parts, which have better material biting ability. The material in area 1 is actively bitten into the grinding area, which reduces the accumulation of materials at the front end of the grinding roller and improves the stability of the material layer.

[0112] An actively rotating auxiliary roller is provided between two adjacent main rollers, which effectively reduces bypass materials and reduces the ineffective circulation load in the mill.

[0113] The rear end of the main roller is equipped with a breaking and sorting device to "loosen" the compacted material, and increase the wind speed on the grinding disc by introducing wind from the wind ring, thereby increasing the sorting efficiency of fine powder on the grinding disc and reducing the fine powder remaining on the material layer. This creates a loose material bed that is conducive to grinding and improves grinding efficiency;

[0114] The scatterer is helpful to reduce the forward resistance of the blade and reduce power loss;

[0115] Several smaller motors and reduction mechanisms are used to replace the original larger main motor and main reduction gear, which reduces the manufacturing difficulty and cost.

[0116] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0117] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A distributed drive vertical roller mill with a breaking and sorting device; characterized in that: It includes a plurality of main grinding devices and a plurality of auxiliary grinding devices of the same number, and a grinding disc; The main grinding device comprises a main roller, a main driving device, and a main pressurizing assembly; the main grinding device is driven to rotate actively by the main driving device; the main driving device comprises a main roller motor, a main roller coupling, a main roller transmission shaft, and a main reduction device connected in sequence; the main roller transmission shaft is rotatably arranged in the main roller shaft; the main pressurizing assembly is used to apply pressure to the main roller so that the material is pre-compressed and crushed between the main roller and the grinding disc; The auxiliary grinding device comprises an auxiliary roller, an auxiliary driving device, and an auxiliary pressurizing assembly; the auxiliary grinding device is driven to rotate actively by the auxiliary driving device; the auxiliary driving device comprises an auxiliary roller motor, an auxiliary roller coupling, an auxiliary roller transmission shaft, and an auxiliary reduction device connected in sequence; the auxiliary roller transmission shaft is rotatably arranged in the auxiliary roller shaft; the auxiliary pressurizing assembly is used to apply pressure to the auxiliary roller so that the material is ground between the auxiliary roller and the grinding disc; The grinding disc is driven to rotate by a grinding disc driving device; the main reduction device and the auxiliary reduction device are both two-stage planetary structures; A scattering and sorting device is arranged between the main roller and the auxiliary roller and close to the downstream of each main roller rotating and grinding the material, and the scattering and sorting device is used to loosen the material after the main roller grinding and compacting and to sort the fine powder therein; The main roller and the auxiliary roller are located in the mill shell and are distributed on the millstone in staggered circles, so that an auxiliary roller is arranged between every two main rollers, and the auxiliary roller is used for pre-compression and crushing of bypass materials between the two main rollers; the distance between the auxiliary roller and its upstream adjacent main roller is greater than the distance between the auxiliary roller and its downstream adjacent main roller, and the gap between the auxiliary roller and the lining plate on the millstone is greater than the gap between the main roller and the lining plate.

2. The distributed drive vertical roller mill with a breaking and sorting device according to claim 1, characterized in that: The scattering and sorting device comprises an air duct, a support frame, a group of scatterers and a group of nozzles; The induced air pipe is hollow and radially arranged above the grinding disc; the end of the induced air pipe away from the center of the grinding disc is the first end; the first end of the induced air pipe is fixed on the middle shell of the vertical roller mill, and the middle part of the induced air pipe is supported by a support frame arranged above the air ring; The portion of the air duct located in the grinding zone is provided with a group of spaced-apart scatterers used to loosen the materials in the grinding zone; the scatterers include a scattering head and a scattering rod, the first end of the scattering rod is fixed to the side wall of the air duct, and the second end of the scattering rod is the scattering head; The scrambling head comprises a base, two side wings and a vertically arranged front blade; the front blade is detachably fixed to the base, and the tip of the front blade is located at the front end of the material-facing side of the scrambling head; the two side wings are located on both sides of the front blade.

3. The distributed drive vertical roller mill with a breaking and sorting device according to claim 2, characterized in that: The end of the air duct close to the center of the grinding disc is the second end; the end surface of the second end of the air duct is closed; the end surface of the first end of the air duct is an opening for introducing compressed air into the air duct; The induced draft duct is also provided with a group of nozzles staggered with the scrambler rods. The nozzles are connected to the interior of the induced draft duct and are located downstream of the scrambler. The outlets of the nozzles are directed upward away from the grinding disc, so as to lift the materials ground on the grinding disc and loosened by the scrambler, and to sort the fine powder.

4. The distributed drive vertical roller mill with a breaking and sorting device according to claim 3 is characterized in that: A material retaining ring is also provided at the outer diameter of the grinding disc, and the distance L1 between the scatterer away from the center of the grinding disc and the material retaining ring is in the range of 100 to 200 mm; The distance L2 between two adjacent scatterers is in the range of 0.8 to 1 times of L1; The number n of the scatterers ranges from 6 to 8; The vertical distance H1 between the bottom of the scatterer and the lining plate is in the range of 20 to 30 mm.

5. The distributed drive vertical roller mill with a breaking and sorting device according to claim 3, characterized in that: The included angle α between the bottom end surface of the front blade and the horizontal plane is in the range of 5° to 10°; The included angle β between the front blade material-confronting end surface and the horizontal plane is in the range of 45° to 50°.

6. The distributed drive vertical roller mill with a breaking and sorting device according to claim 2, characterized in that: The angle γ between the wing centerline and the horizontal plane ranges from 25° to 35°; The included angle ε between the flank center lines of the two flanks is in the range of 25° to 35°; The height H2 of the vertex of the center line of the side wing from the lowest end of the front blade is in the range of 40 to 70 mm; The height H3 between the top and bottom of the front blade is in the range of 120 to 200 mm.

7. The distributed drive vertical roller mill with a breaking and sorting device according to claim 1, characterized in that: The speed range of the main roller is 40-60 rpm, and the reduction ratio range of the main reduction device is 15-25; The rotation speed range of the auxiliary roller is 50-70 rpm, and the reduction ratio range of the auxiliary reduction device is 14-20.

8. The distributed drive vertical roller mill with a breaking and sorting device according to claim 1, characterized in that: Each of the main grinding devices is supported by a concrete support, and two adjacent concrete supports are connected by the concrete connecting bridge; the auxiliary rocker arm shaft in the auxiliary pressure assembly can be rotatably fixed on the auxiliary roller rocker arm support on the top surface of the connecting bridge, and the second end of the auxiliary roller cylinder is hinged to the auxiliary roller cylinder support fixed on the side wall of the connecting bridge.

9. The distributed drive vertical roller mill with a breaking and sorting device according to claim 1, characterized in that: The central axis of the main roller motor is coaxial with the central axis of the main roller, and the angle δ with the horizontal plane is in the range of 15° to 20°; the central axis of the auxiliary roller motor is coaxial with the center line of the auxiliary roller, and the angle δ with the horizontal plane is.

10. The distributed drive vertical roller mill with a breaking and sorting device according to claim 1, characterized in that: The main roller motor, the auxiliary roller motor and the grinding disc motor are all variable frequency motors, and the rotation speeds of the main roller, the auxiliary roller and the grinding disc can be adjusted respectively.

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