Energy-saving and efficient vertical mill

Abstract

The invention discloses an energy-saving and efficient vertical mill, and belongs to the technical field of grinding and pulverizing equipment. The vertical mill comprises a base, a round chassis, a cylindrical shell and the like, wherein a lower cylinder, a millstone, an upper cylinder, a circular ring partition plate and the like are arranged in the cylindrical shell. The millstone is in a circular groove shape and driven by a millstone motor, the included angle between the generatrix of the inner side wall face of the grinding ring and the horizontal plane is 45-75 degrees, the lower end of the center line of the roller shaft inclines towards the rotating direction of the millstone, and materials can be efficiently ground. According to the equipment, material sorting and conveying are achieved through an annular air inlet channel, a cage type separator and the like, the annular air inlet channel is provided with a coarse slag scraping plate and a coarse slag outlet, and the cage type separator is matched with a fine powder discharging bin and a fine powder discharging pipe to complete coarse powder and fine powder separation. In addition, an elastic mechanism is arranged for mounting the grinding roller, so that equipment vibration is reduced. The vertical mill is high in grinding efficiency, remarkable in energy conservation, dual-purpose, good in stability, convenient to operate and capable of meeting the grinding and pulverizing requirements of various materials and effectively solving many problems existing in a traditional vertical mill.

Description

Technical Field

[0001] The invention relates to the technical field of grinding and powder making equipment, and in particular to an energy-saving and efficient vertical mill. Background Art

[0002] Among the many links in industrial production, grinding and milling is an indispensable basic process, which is widely used in many industries such as building materials, mining, and chemicals. As a key equipment for grinding and milling, the performance of vertical mill directly affects the production efficiency, product quality and cost. However, there are many problems in traditional vertical mills that cannot be ignored, which seriously restricts the development of related industries.

[0003] In terms of grinding efficiency, the grinding disc and grinding roller structure design of traditional vertical mills is not scientific enough. The angle of the inner wall of the grinding ring is unreasonable, which makes it impossible for the grinding roller to fully press the material, and the material is easy to slip and difficult to be effectively ground. For example, in cement production, the limestone is only 60% to 70% up to standard after being ground by a traditional vertical mill. Repeated processing is required, resulting in an increase in energy consumption of about 30%. This not only prolongs production time, but also greatly increases energy consumption, causing the company's production costs to rise significantly.

[0004] There are also problems in the material sorting process. The cage separator equipped with the traditional vertical mill has a simple structure and lacks the ability to accurately distinguish between coarse and fine powders. In actual production, coarse and fine powders are often mixed in the finished product, and the product particle size is uneven. This will seriously affect the performance and quality of the product for some industries that have strict requirements on product particle size, such as electronic materials and fine chemicals, and make the product unable to meet the needs of the high-end market.

[0005] In addition, the air intake system of traditional vertical mills also has defects. The unreasonable design of the air intake channel makes the air volume distribution uneven. This not only affects the material conveying efficiency in the equipment, but also interferes with the material separation effect, resulting in a decrease in the overall operating performance of the equipment. Moreover, traditional vertical mills are not convenient enough in terms of maintenance. The installation and disassembly of components are relatively complicated, which increases maintenance costs and downtime, further reducing the production efficiency of enterprises.

[0006] In summary, developing an energy-saving and efficient vertical mill that can effectively improve grinding efficiency, accurately sort materials, optimize the air intake system and facilitate maintenance has become an important issue that needs to be urgently addressed in the field of grinding and powder making equipment. Summary of the invention

[0007] The purpose of the present invention is to provide an energy-saving and efficient vertical mill in view of the defects of the prior art. By optimizing the design of the grinding disc, grinding roller structure, air intake, sorting system, etc., the grinding efficiency and sorting accuracy of the material can be improved, the energy consumption can be reduced, and the overall performance of the equipment can be improved to meet the needs of industrial production for high-quality and high-efficiency grinding and powder making equipment.

[0008] The present invention is realized through the following technical solutions: An energy-saving and efficient vertical mill, comprising a base, a round chassis is provided on the upper part of the base, and a cylindrical shell is connected to the upper part of the round chassis. It is characterized in that: a lower cylinder, a grinding table driven by a grinding table motor to rotate, an upper cylinder, an annular partition board are sequentially arranged inside the cylindrical shell from bottom to top, and a shell cover is connected to the upper end of the cylindrical shell; The said grinding table is a circular groove-shaped structure composed of a round bottom and an annular wall. A grinding ring is installed on the inner side of the annular wall. The angle (β) between the generatrix of the inner side wall surface of the grinding ring and the horizontal plane is 45 to 75 degrees. A plurality of grinding rollers composed of roller shafts and roller bodies are annularly distributed on the upper surface of the grinding table. The grinding rollers are circumferentially closely attached to the grinding ring. The lower end of the center line of the roller shaft inclines towards the rotation direction of the grinding table. According to the corresponding position relationship between the fan-shaped plane unfolded along the inner side surface of the grinding ring and the roller body, the connection line between the center point of the roller body and the center of the fan-shaped plane is called the roller connection center line. The angle between the roller connection center line and the projection line of the roller shaft center line on the fan-shaped plane is 5 to 20 degrees; An annular air inlet channel is formed between the outer periphery of the lower cylinder and the cylindrical shell. A number of air inlet holes communicating with the annular air inlet channel are annularly distributed at the lower part of the cylindrical shell. 1 to 3 coarse slag scraping plates connecting to the outer side of the annular wall are arranged inside the annular air inlet channel. A coarse slag outlet is provided on the round chassis at the bottom of the annular air inlet channel, and a coarse slag discharge pipe is connected below the coarse slag outlet; Below the annular partition board is a cage-type separator driven by a separator motor to rotate. Between the upper parts of the annular partition board and the cage-type separator, the cylindrical shell and the shell cover, there is a fine powder discharge bin. A fine powder discharge pipe communicating with the fine powder discharge bin is provided at the upper part of the cylindrical shell; An annular discharge channel is formed between the outer periphery of the upper cylinder and the cylindrical shell. There is an annular powder inlet left between the lower end of the annular discharge channel and the annular wall, and an annular powder outlet left between the upper end of the annular discharge channel and the annular partition board; A conical coarse powder receiving hopper is arranged inside the upper cylinder below the cage-type separator. Below the coarse powder receiving hopper is a blanking bin. A feed pipe penetrating through the cylindrical shell and the upper cylinder and with the inner end inclined downward is provided on the side of the blanking bin. A feed hopper is provided at the outer side end of the feed pipe; A discharge sleeve pipe penetrating through the cylindrical shell and the upper cylinder and with the outer side end inclined downward is provided on the side of the blanking bin. A coarse powder discharge pipe with the inner port butt-jointed to the lower opening of the coarse powder receiving hopper is slidably installed inside the discharge sleeve pipe. A handwheel tightening bolt for tightening the coarse powder discharge pipe is provided at the outer side end of the sleeve pipe.

[0009] Preferably, the angle between the generatrix of the inner side wall surface of the grinding ring and the horizontal plane is 65 to 70 degrees.

[0010] Preferably, the angle between the roller connection center line and the projection line of the roller shaft center line on the fan-shaped plane is 8 to 15 degrees.

[0011] Preferably, a gear speed reducer is provided below the round chassis, and the grinding table motor drives the grinding table to rotate through the gear speed reducer.

[0012] Preferably, the multiple grinding rollers are respectively installed by elastic mechanisms arranged on the outer wall of the cylinder shell, and the elastic mechanism includes an articulated seat fixedly connected to the outside of the cylinder shell, a vertical arm, a horizontal arm, an airbag, and an axial sleeve that penetrates and connects the cylinder shell and the upper cylinder. The middle part of the vertical arm is connected to the roller shaft through the horizontal arm that passes through the axial sleeve, the upper end of the vertical arm is hinged to the articulated seat, and the lower end of the vertical arm is provided with an airbag elastically supported on the cylinder shell and the lower end of the vertical arm, and the airbag is provided with an air inlet connected to an external air source.

[0013] Preferably, a spring shock absorber is arranged on the vertical arm between the cross arm and the airbag.

[0014] Preferably, an annular protective shell is provided on the outer side of the annularly distributed air inlet holes and is buckled onto the cylindrical shell, and an air inlet is provided on the protective shell.

[0015] (1) High grinding efficiency: The angle between the inner wall of the grinding ring and the horizontal plane is 45 to 75 degrees. At the normal speed of the grinding disc, whether it rotates clockwise or counterclockwise, the direction of the combined force generated by the material's own gravity and centrifugal force is basically vertical to the inner wall of the grinding ring, so the material will not be thrown out of the grinding disc by the centrifugal force. During the grinding operation, the lower end of the roller centerline tilts toward the direction of rotation of the grinding disc, and the grinding disc rotates counterclockwise; the roller body has a dual effect of squeezing and grinding the material. At the same time, the extruded and ground material can be pushed to the upper edge of the grinding ring by the roller body and the grinding ring, and then sucked into the annular discharge channel under the action of centrifugal force and wind force. The unique design of the grinding disc and grinding roller structure enables the grinding roller to fully grind the material, improve the grinding efficiency, and reduce the grinding time.

[0016] (2) One machine with two purposes: Without starting the fan and separator motor, it can be used as a wet mill. In the wet mill mode, the material is mixed with water and discharged directly through the coarse powder outlet without wind separation. The ground mixed material is discharged through the coarse slag outlet and the coarse slag discharge pipe.

[0017] (3) Two products, fine powder and coarse powder, can be produced: During dry grinding, fine powder, coarse powder, or coarse powder can be ground and only fine powder can be produced at the same time according to demand. The fine powder discharge pipe is connected to the induced draft fan and the fine powder collection device to obtain fine powder products; the coarse powder discharge pipe slides up and is fixed by the hand wheel to tighten the bolts so that its inner end is connected to the lower opening of the coarse powder receiving hopper. The coarse powder separated by the cage separator is discharged through the receiving hopper and the coarse powder discharge pipe to obtain a coarse powder product.

[0018] (4) Significant energy-saving effect: The optimized air inlet channel design makes the air volume evenly distributed, improves the material conveying and separation efficiency, and reduces energy consumption. At the same time, the annular discharge channel design increases the wind speed by reducing the cross-sectional area, enhances the material conveying efficiency, and reduces the fan energy consumption.

[0019] (5) Good equipment stability: With the elastic mechanism and spring shock absorber, the airbag provides the basic pressure, and the spring shock absorber absorbs high-frequency vibrations, effectively reducing the vibration of the equipment during operation and improving the stability and service life of the equipment.

[0020] (6) Convenient operation and maintenance: The equipment is reasonably structured, and each component is easy to install, disassemble and maintain. For example, the coarse powder discharge pipe is fixed by the handwheel tightening bolt, which is convenient for adjustment and replacement. Brief Description of the Drawings

[0021] Figure 1 Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the sectional structure of the present invention; Figure 3 Schematic diagram of the side structure of the roller, shaft sleeve and their connecting mechanism of the present invention; Figure 4 Schematic top view of the grinding disc and grinding roller of the present invention; Figure 5 Schematic diagram of the positional relationship between the grinding roller on the unfolded plane of the grinding ring in the unfolded plane state of the grinding ring of the present invention; Figure 6 Schematic diagram of the sectional structure of the grinding disc and grinding roller of the present invention; Figure 7 Schematic three-dimensional structure diagram of the round chassis and grinding disc of the present invention; Figure 8 Schematic three-dimensional structure diagram of the air inlet hole and annular protective shell of the present invention; Figure 9 Schematic three-dimensional structure diagram of the cage-type separator and annular partition of the present invention.

[0022] Main symbol description: 1 Base, 2 Round chassis, 3 Cylindrical shell, 4 Lower cylinder, 5 Grinding disc motor, 6 Grinding disc, 7 Upper cylinder, 8 Annular partition, 9 Shell cover, 10 Round bottom, 11 Ring wall, 12 Grinding ring, 13 Roller shaft, 14 Roller body, 15 Annular air inlet channel, 16 Air inlet hole, 17 Coarse slag scraping plate, 18 Coarse slag outlet, 19 Coarse slag discharge pipe, 20 Separator motor, 21 Cage-type separator, 22 Fine powder discharge bin, 23 Fine powder discharge pipe, 24 Annular discharge channel, 25 Annular powder inlet, 26 Annular powder outlet, 27 Coarse powder receiving hopper, 28 Falling material bin, 29 Feed pipe, 30 Feed hopper, 31 Discharge sleeve, 32 Coarse powder discharge pipe, 33 Handwheel tightening bolt, 34 Gear reducer, 35 Hinge seat, 36 Vertical arm, 37 Horizontal arm, 38 Airbag, 39 Shaft sleeve, 40 Air inlet, 41 Spring shock absorber, 42 Annular protective shell, 43 Air inlet, AB Roller shaft center line, CO Roller connection center line, α Angle between the projection lines of the roller shaft center line on the fan-shaped plane, β Angle between the generatrix of the inner wall surface of the grinding ring and the horizontal plane. Specific Embodiments

[0023] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. For example: the lower end of the center line of the roller shaft is inclined in the rotation direction of the grinding disc. In this inclination direction, when the grinding operation is performed, the grinding disc needs to rotate counterclockwise; it can also be expressed as: the upper end of the center line of the roller shaft is inclined in the rotation direction of the grinding disc. In this inclination direction, when the grinding operation is performed, the grinding disc needs to rotate clockwise.

[0025] Please refer to Figures 1 to 9 , a specific structural embodiment of the present invention is as follows: The base 1 of the vertical mill is a stable steel structure platform, and its size is designed according to the overall load-bearing requirements of the equipment, and can stably support the entire equipment. A round chassis 2 is installed on the upper part of the base 1. The round chassis 2 is made of high-strength cast iron and is tightly connected to the base 1 by bolts.

[0026] A cylindrical shell 3 is connected to the upper part of the round chassis 2. The cylindrical shell 3 is welded by steel plates to form a closed cavity. Inside the cylindrical shell 3, a lower cylinder 4, a grinding disc 6, an upper cylinder 7, and an annular partition 8 are arranged in sequence from bottom to top.

[0027] The grinding disc 6 is driven by a grinding disc motor 5 to rotate. The grinding disc motor 5 is a variable-frequency motor with a power of 150 kW, and the rotation speed can be adjusted according to the material grinding requirements. A gear reducer 34 is installed under the round chassis 2. The output shaft of the grinding disc motor 5 is connected to the input shaft of the gear reducer 34 through a coupling, and the output shaft of the gear reducer 34 is then connected to the central shaft of the grinding disc 6 to realize the stable rotation of the grinding disc 6. The grinding disc 6 is a circular groove-shaped structure composed of a round bottom 10 and a ring wall 11. A grinding ring 12 is installed on the inner side of the ring wall 11. The grinding ring 12 is made of a high-wear-resistant alloy material, and the angle β between the generatrix of the inner side wall surface of the grinding ring and the horizontal plane is 68 degrees.

[0028] Four grinding rollers composed of a roller shaft 13 and a roller body 14 are arranged in a circular distribution on the grinding disc 6. Refer to Figure 5, the lower end of the roller axis center line AB inclines towards the rotation direction of the grinding disc 6. According to the corresponding position relationship between the fan-shaped plane unfolded along the inner side surface of the grinding ring 12 and the roller body 14, the connecting line between the center point of the roller body 14 and the center of the fan-shaped plane is called the roller connecting center line CO. The included angle α between the roller connecting center line CO and the projection line of the roller axis center line AB on the fan-shaped plane is 5 to 20 degrees; An annular air inlet passage 15 is formed between the outer periphery of the lower cylinder 4 and the cylinder shell 3. Twelve air inlet holes 16 that are annularly distributed and communicate with the annular air inlet passage 15 are evenly arranged at the lower part of the cylinder shell 3. Two coarse slag scraping plates 17 connecting the outer sides of the connecting ring walls 11 are arranged inside the annular air inlet passage 15. The coarse slag scraping plates 17 are made of wear-resistant rubber. A coarse slag outlet 18 is provided on the round bottom plate 2 at the bottom of the annular air inlet passage 15. A coarse slag discharge pipe 19 is connected below the coarse slag outlet 18. The diameter of the coarse slag discharge pipe 19 is designed according to the coarse slag discharge amount.

[0029] A cage-type separator 21 driven by a separator motor 20 is installed below the circular ring partition 8. The power of the separator motor 20 is 30 kW. A fine powder discharge bin 22 is formed between the upper parts of the circular ring partition 8 and the cage-type separator 21, the cylinder shell 3 and the shell cover 9. A fine powder discharge pipe 23 communicating with the fine powder discharge bin 22 is provided at the upper part of the cylinder shell 3. The fine powder discharge pipe 23 is connected to a subsequent induced draft fan and its supporting fine powder collection device.

[0030] An annular discharge passage 24 is formed between the outer periphery of the upper cylinder 7 and the cylinder shell 3. An annular powder inlet 25 is left between the lower end of the annular discharge passage 24 and the ring wall 11. An annular powder outlet 26 is left between the upper end of the annular discharge passage 24 and the circular ring partition 8.

[0031] A conical coarse powder receiving hopper 27 is arranged inside the upper cylinder 7 below the cage-type separator 21. Below the coarse powder receiving hopper 27 is a blanking bin 28. A feed pipe 29 passing through the cylinder shell 3 and the upper cylinder 7 and with its inner end inclined downward is provided on the side of the blanking bin 28. A feed hopper 30 is provided at the outer end of the feed pipe 29. A discharge sleeve 31 passing through the cylinder shell 3 and the upper cylinder 7 and with its outer end inclined downward is also provided on the side of the blanking bin 28. A handwheel tightening bolt 33 pressing against the coarse powder discharge pipe 32 is slidably installed inside the discharge sleeve 31.

[0032] Adjusting the fixed position of the coarse powder discharge pipe 32 can achieve the discharge of coarse powder or re-grinding. When the inner port of the discharge sleeve 31 is butted against the lower opening of the coarse powder receiving hopper 27, the coarse powder is discharged through the coarse powder discharge pipe 32 for other uses; when the discharge sleeve 31 slides down and is fixed so that its inner port leaves the lower opening of the receiving hopper 27, the coarse powder falls into the circular groove of the grinding disc 6 for re-grinding.

[0033] The four grinding rollers are respectively installed by an elastic mechanism disposed on the outer wall of the barrel shell 3. The elastic mechanism includes a hinge seat 35 fixedly connected to the outside of the barrel shell 3, a vertical arm 36, a horizontal arm 37, an airbag 38, and a shaft sleeve 39 penetrating and connecting the barrel shell 3 and the upper cylinder 7. The middle of the vertical arm 36 is connected to the roller shaft 13 through the horizontal arm 37 passing through the shaft sleeve 39. The upper end of the vertical arm 36 is hinged on the hinge seat 35. An airbag 38 which is elastically supported between the barrel shell 3 and the lower end of the vertical arm 36 is arranged at the lower end of the vertical arm 36. An air inlet 40 connected to an external air source is provided on the airbag 38. A spring shock absorber 41 is arranged on the vertical arm 36 between the horizontal arm 37 and the airbag 38.

[0034] An annular protective shell 42 buckled on the barrel shell 3 is arranged outside the annularly distributed air inlet holes 16. The protective shell 42 is made of stainless steel, and an air inlet 43 is provided on the protective shell 42.

[0035] The working principle of the present invention will be described in detail below with reference to the accompanying drawings: Material grinding: Start the grinding disc motor 5 to drive the grinding disc 6 to rotate through the gear speed reducer 34. The material enters the blanking bin 28 from the feed hopper 30 through the feed pipe 29, and then falls into the circular groove of the grinding disc 6. Due to the rotation of the grinding disc 6, under the action of centrifugal force and its own gravity, the grinding rollers roll closely against the grinding ring 12 in the circumferential direction.

[0036] See Figure 6 , the included angle between the generatrix of the inner side wall surface of the grinding ring 12 and the horizontal plane is 68 degrees. Set the rotation speed of the grinding disc to 100 r / min and rotate counterclockwise. The direction of the resultant force generated by the self-gravity and centrifugal force of the material is basically perpendicular to the grinding ring, and the material will not be thrown out of the grinding disc by the centrifugal force.

[0037] See Figure 4 and Figure 5 , the grinding disc rotates counterclockwise. The included angle α between the projection line of the roller connection center line CO and the roller shaft center line AB on the sector plane is 10 degrees. Set the rotation speed of the grinding disc to 100 r / min and rotate counterclockwise. The roller shaft exerts extrusion and grinding effects on the material, and at the same time rolls the crushed material to the upper edge of the grinding ring. The material enters the annular discharge channel under the action of centrifugal force and wind force.

[0038] Material conveying and sorting: The annular protective shell (42) covers the outside of the air inlet holes (16) to form a closed air inlet channel. External air enters from the air inlet 43 of the annular protective shell 42 and enters the annular air inlet channel 15 through the air inlet holes 16. The coarse slag scraping plate 17 in the air inlet channel rotates with the grinding disc 6 to scrape the coarsely ground slag to the coarse slag outlet 18 and discharge it through the coarse slag discharge pipe 19. The ground powder enters the annular discharge channel 24 through the annular powder inlet 25, moves upward to the annular powder outlet 26, and the separator motor 20 drives the cage type separator 21 to rotate. The rotating cage type separator 21 sorts the powder. Fine powder meeting the fineness requirement is carried into the fine powder discharge bin 22 by the air flow through the cage separator 21 and discharged through the fine powder discharge pipe 23; the coarse powder that does not meet the fineness requirement is blocked outside the cage separator 21, falls into the coarse powder receiving hopper 27, and is discharged through the coarse powder discharge pipe 32, or directly falls into the circular groove of the grinding table 6 for re-grinding.

[0039] Elastic adjustment of the grinding roller: An elastic mechanism is provided on the outer wall of the cylinder shell 3. The air bag 38 is connected to an external air pressure device. After the air bag 38 is inflated, it provides an upward supporting force, which is transmitted to the grinding roller through the hinge seat 35 to achieve pressure adjustment. When the material is hard, the air pressure in the air bag 38 can be increased to increase the pressure of the grinding roller on the material and improve the grinding effect; when the material is soft, the air pressure in the air bag 38 can be appropriately reduced to reduce the wear of the grinding roller. The spring shock absorber 41 can play a shock-absorbing role during the operation of the grinding roller to reduce the vibration of the equipment.

[0040] Application Example 1: Select limestone as the grinding material. After the equipment is installed and debugged, start the grinding table motor 5 and the separator motor 20, and set the grinding table speed to 100 r / min and the speed of the separator motor 20 to 80 r / min. Add limestone evenly from the feed hopper 30 and observe the grinding and separation process of the material in the equipment through the observation window. After running for a period of time, collect the finished product discharged from the fine powder discharge pipe 23. After testing, 95% of the particle size of the finished product meets the requirements, the discharge amount of the coarse powder is small, the equipment runs stably, and the grinding efficiency is high.

[0041] Application Example 2: Use pulverized coal as the grinding material. Adjust the grinding table speed to 120 r / min and the speed of the separator motor 20 to 90 r / min. Since the pulverized coal is soft in texture, the air pressure in the air bag 38 is appropriately reduced. During the operation, the vibration of the equipment is small and the grinding effect of the pulverized coal is good. Collect the finished product for testing. The fineness and quality of the pulverized coal both meet the expected standards, and the energy consumption is low, which reflects the adaptability of the equipment to different materials.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. An energy-saving and highly efficient vertical mill, comprising a base (1), a round chassis (2) is provided on the upper part of the base (1), and a cylindrical shell (3) is connected to the upper part of the round chassis (2), characterized in that: Inside the cylindrical shell (3), a lower cylinder (4), a grinding disc (6) driven by a grinding disc motor (5) to rotate, an upper cylinder (7), and an annular partition plate (8) are sequentially arranged from bottom to top; the upper end of the cylindrical shell (3) is connected to a shell cover (9); the grinding disc (6) is a circular groove-shaped structure composed of a round bottom (10) and an annular wall (11), a grinding ring (12) is installed on the inner side of the annular wall (11), the angle (β) between the generatrix of the inner side wall surface of the grinding ring (12) and the horizontal plane is 45 to 75 degrees, a plurality of grinding rollers composed of roller shafts (13) and roller bodies (14) are annularly distributed on the upper surface of the grinding disc (6), the grinding rollers are circumferentially closely attached to the grinding ring (12), the lower end of the center line (AB) of the roller shaft inclines in the rotation direction of the grinding disc (6), according to the corresponding position relationship between the fan-shaped plane unfolded from the inner side surface of the grinding ring (12) and the roller body (14), the connection line between the center point of the roller body (14) and the center of the fan-shaped plane is called the roller connection center line (CO), and the angle (α) between the roller connection center line (CO) and the projection line of the roller shaft center line (AB) on the fan-shaped plane is 5 to 20 degrees; an annular air inlet channel (15) is formed between the outer periphery of the lower cylinder (4) and the cylindrical shell (3), several air inlet holes (16) that are annularly distributed and communicate with the annular air inlet channel (15) are arranged at the lower part of the cylindrical shell (3), 1 to 3 coarse slag scraping plates (17) connecting to the outer side of the annular wall (11) are arranged inside the annular air inlet channel (15), a coarse slag outlet (18) is provided on the round bottom plate (2) at the bottom of the annular air inlet channel (15), and a coarse slag discharge pipe (19) is connected below the coarse slag outlet (18); below the annular partition plate (8) is a cage-type separator (21) driven by a separator motor (20) to rotate, a fine powder discharge bin (22) is arranged between the upper parts of the annular partition plate (8) and the cage-type separator (21), the cylindrical shell (3) and the shell cover (9), and a fine powder discharge pipe (23) communicating with the fine powder discharge bin (22) is arranged at the upper part of the cylindrical shell (3); an annular discharge channel (24) is formed between the outer periphery of the upper cylinder (7) and the cylindrical shell (3), an annular powder inlet (25) is left between the lower end of the annular discharge channel (24) and the annular wall (11), and an annular powder outlet (26) is left between the upper end of the annular discharge channel (24) and the annular partition plate (8); a conical coarse powder receiving hopper (27) is arranged inside the upper cylinder (7) below the cage-type separator (21), a blanking bin (28) is arranged below the coarse powder receiving hopper (27), a feed pipe (29) that penetrates through the cylindrical shell (3) and the upper cylinder (7) and whose inner end inclines downward is arranged on the side of the blanking bin (28), and a feed hopper (30) is arranged at the outer side end of the feed pipe (29); a discharge sleeve (31) that penetrates through the cylindrical shell (3) and the upper cylinder (7) and whose outer side end inclines downward is arranged on the side of the blanking bin (28), a coarse powder discharge pipe (32) whose inner port is butted against the lower opening of the coarse powder receiving hopper (27) is slidably installed inside the discharge sleeve (31), and a handwheel tightening bolt (33) for tightening the coarse powder discharge pipe (32) is arranged at the outer side end of the sleeve (31).

2. The energy-saving and highly efficient vertical mill according to claim 1, characterized in that: The angle (β) between the generatrix of the inner side wall surface of the grinding ring and the horizontal plane is 65 to 70 degrees.

3. The energy-saving and highly efficient vertical mill according to claim 2, wherein: The included angle (α) between the projection line of the roller connection center line (CO) and the roller shaft center line (AB) on the fan-shaped plane is 8 to 15 degrees.

4. An energy-saving and highly efficient vertical mill according to claim 1, characterized in that: A gear speed reducer (34) is provided below the circular chassis (2), and the grinding disc motor (5) drives the grinding disc (6) to rotate through the gear speed reducer (34).

5. An energy-saving and highly efficient vertical mill according to claim 1 or 2, characterized in that: The plurality of grinding rollers are respectively installed by an elastic mechanism provided on the outer wall of the cylinder shell (3). The elastic mechanism includes a hinge seat (35), a vertical arm (36), a horizontal arm (37), an airbag (38), and a shaft sleeve (39) that penetrates and connects the cylinder shell (3) and the upper cylinder (7). The middle of the vertical arm (36) is connected to the roller shaft (13) through the horizontal arm (37) passing through the shaft sleeve (39). The upper end of the vertical arm (36) is hinged to the hinge seat (35). An airbag (38) that elastically supports the lower end of the cylinder shell (3) and the vertical arm (36) is provided at the lower end of the vertical arm (36). An air inlet (40) for connecting an external air source is provided on the airbag (38).

6. The energy-saving and highly efficient vertical mill according to claim 5, wherein: A spring shock absorber (41) is provided on the vertical arm (36) between the horizontal arm (37) and the airbag (38).

7. An energy-saving and highly efficient vertical mill according to claim 1, characterized in that: An annular protective shell (42) buckled on the cylinder shell (3) is provided outside the annularly distributed air inlet holes (16), and an air inlet (43) is provided on the protective shell (42).

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