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] This invention relates to the field of grinding and powder making equipment technology, and in particular to an energy-saving and efficient vertical mill. Background Technology

[0002] Grinding and powder production is an indispensable basic process in many stages of industrial production, widely used in building materials, mining, chemicals, and other industries. As a key piece of equipment in grinding and powder production, the performance of the vertical mill directly affects production efficiency, product quality, and cost. However, traditional vertical mills suffer from several significant problems that severely restrict the development of related industries.

[0003] In terms of grinding efficiency, the design of the grinding disc and rollers in traditional vertical mills is not scientifically sound. The unreasonable angle of the inner wall of the grinding ring prevents the rollers from applying sufficient pressure to the material, causing it to slip and making effective grinding difficult. For example, in cement production, limestone only achieves a 60%–70% pass rate after a single grinding cycle in a traditional vertical mill, requiring repeated processing and increasing energy consumption by approximately 30%. This not only prolongs production time but also significantly increases energy consumption, leading to a substantial rise in production costs for enterprises.

[0004] Problems also exist in the material sorting process. Traditional vertical mills are equipped with cage separators, which have a simple structure and lack the ability to accurately distinguish between coarse and fine powders. In actual production, the mixing of coarse and fine powders is common in the finished product, resulting in uneven particle size. This can severely impact product performance and quality in industries with strict particle size requirements, such as electronic materials and fine chemicals, making it impossible for products to meet the demands of high-end markets.

[0005] Furthermore, the air intake system of traditional vertical mills also has defects. An unreasonable design of the air intake channel results in uneven airflow distribution. This not only affects the material conveying efficiency within the equipment but also interferes with the material separation effect, leading to a decline in the overall operating performance of the equipment. Moreover, traditional vertical mills are not convenient to maintain; the installation and disassembly of components are relatively complex, increasing maintenance costs and downtime, further reducing the company's production efficiency.

[0006] In conclusion, developing an energy-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 urgently needs to be addressed in the field of grinding and powder making equipment. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing an energy-efficient vertical mill. By optimizing the structure of the grinding disc and rollers, as well as the design of the air intake and sorting system, the grinding efficiency and sorting accuracy of materials are improved, energy consumption is reduced, and the overall performance of the equipment is enhanced, thus meeting the industrial production demand for high-quality and high-efficiency grinding and powder making equipment.

[0008] The present invention is achieved through the following technical solution: an energy-saving and efficient vertical mill, including a base, a circular bottom plate on the upper part of the base, and a cylindrical shell connected to the upper part of the circular bottom plate, characterized in that: the inner part of the cylindrical shell is arranged from bottom to top as follows: a lower cylinder, a grinding disc driven to rotate by a grinding disc motor, an upper cylinder, a circular partition plate, and a shell cover connected to the upper end of the cylindrical shell. The grinding disc is a circular groove structure consisting of a round bottom and annular walls. A grinding ring is installed on the inner side of the annular wall. The angle (β) between the generatrix of the inner wall of the grinding ring and the horizontal plane is 45 to 75 degrees. Multiple grinding rollers consisting of roller shafts and roller bodies are arranged in a ring on the grinding disc. The grinding rollers are tightly attached to the grinding ring in the circumferential direction. The lower end of the center line of the roller shaft is inclined in the direction of rotation of the grinding disc. According to the corresponding positional relationship between the fan-shaped plane unfolded on the inner side of the grinding ring and the roller body, the line connecting the center point of the roller body and the center of the fan-shaped plane is called the roller connecting center line. The angle between the roller connecting center line and the projection line of the roller shaft center line on the fan-shaped plane is 5 to 20 degrees. The lower cylinder and the outer shell form an annular air inlet channel. Several annularly distributed air inlet holes connected to the annular air inlet channel are provided at the lower part of the shell. Inside the annular air inlet channel, there are 1 to 3 coarse slag scrapers connected to the outer side of the ring wall. The bottom plate at the bottom of the annular air inlet channel is provided with a coarse slag outlet, and a coarse slag discharge pipe is connected below the coarse slag outlet. The lower part of the circular baffle is a cage separator driven by the separator motor to rotate. Between the upper part of the circular baffle and the cage separator, there is a fine powder discharge bin. A fine powder discharge pipe connecting the fine powder discharge bin is provided on the upper part of the cylinder. An annular discharge channel is formed between the outer periphery of the upper cylinder and the cylinder shell. An annular powder inlet is left between the lower end of the annular discharge channel and the annular wall, and an annular powder outlet is left between the upper end of the annular discharge channel and the circular partition. The upper cylinder below the cage separator is equipped with a conical coarse powder receiving hopper. Below the coarse powder receiving hopper is a discharge bin. The side of the discharge bin is equipped with a feed pipe that penetrates the shell and the upper cylinder and slopes downward on the inner end. The outer end of the feed pipe is equipped with a feed hopper. The side of the discharge bin is equipped with a discharge sleeve that penetrates the shell and the upper cylinder and slopes downward on the outer end. The inner end of the discharge sleeve is slidably installed to connect with the coarse powder discharge pipe at the lower opening of the coarse powder receiving hopper. The outer end of the sleeve is equipped with a handwheel tightening bolt to tighten the coarse powder discharge pipe.

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

[0010] Preferably, the angle between the projection lines of the roller connecting circle centerline and the roller shaft centerline on the sector plane is 8 to 15 degrees.

[0011] Preferably, a gear reducer is provided below the circular base, and the grinding disc motor drives the grinding disc to rotate through the gear reducer.

[0012] Preferably, the plurality of grinding rollers are respectively installed by an elastic mechanism disposed on the outer wall of the cylinder shell. The elastic mechanism includes a hinge seat fixedly connected to the outside of the cylinder shell, a vertical arm, a horizontal arm, an air bladder, and a bushing that passes through 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 passing through the bushing. The upper end of the vertical arm is hinged to the hinge seat. The lower end of the vertical arm is provided with an air bladder that elastically supports the cylinder shell and the lower end of the vertical arm. The air bladder is provided with an air inlet for connecting to an external air source.

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

[0014] Preferably, the roller body surface is uniformly provided with a plurality of axially extending wear-resistant ridges, the ridge height is 1 to 3 mm, the spacing between adjacent ridges is 5 to 8 mm, the ridge material is high chromium alloy or tungsten carbide alloy, and the ridges are integrally cast or welded to the roller body; the ridges can enhance the contact pressure and shearing effect between the roller body and the material, and prevent the material from slipping.

[0015] Preferably, an annular protective shell is provided on the outside of the annularly distributed air inlet holes and fastened to the cylindrical shell, and the protective shell is provided with an air inlet.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) High grinding efficiency: The angle between the generatrix of the inner wall of the grinding ring and the horizontal plane is 45-75 degrees. Under the normal rotation speed of the grinding disc, whether it rotates clockwise or counterclockwise, the direction of the resultant force generated by the material's own gravity and centrifugal force is basically perpendicular to the inner wall of the grinding ring. Therefore, the material will not be thrown out of the grinding disc by centrifugal force. During the grinding operation, the lower end of the roller shaft center line is inclined towards the rotation direction of the grinding disc, and the grinding disc rotates counterclockwise. The roller body has a dual function of squeezing and grinding the material. At the same time, the squeezed and ground material can be pushed by the roller body and the grinding ring to the upper edge of the grinding ring. Then, under the action of centrifugal force and wind force, it is sucked into the annular discharge channel. The uniquely designed grinding disc and grinding roller structure enables the grinding roller to grind the material fully, improves the grinding efficiency, and reduces the grinding time.

[0017] (2) Two uses in one machine: It can be used as a wet mill without starting the blower and separator motor. In wet mill mode, the material is mixed with water and discharged directly through the coarse powder outlet without the need for air separation. The ground mixture is discharged through the coarse slag outlet and coarse slag discharge pipe.

[0018] (3) It can produce two products: fine powder and coarse powder. When dry grinding, it can be selected to produce fine powder and coarse powder at the same time, or coarse powder can be ground to produce only fine powder, depending on the needs. The fine powder discharge pipe is connected to the induced draft fan and the fine powder collection device to obtain fine powder product; the coarse powder discharge pipe slides upward and is fixed by the handwheel and the top bolt, so that its inner end is connected to the bottom 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 coarse powder product.

[0019] (4) Significant energy saving effect: The optimized air inlet channel design makes the air volume distribution uniform, 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 energy consumption of the blower.

[0020] (5) Good equipment stability: The setting of elastic mechanism and spring shock absorber, the air bag provides basic pressure, and the spring shock absorber absorbs high frequency vibration, which effectively reduces the vibration of the equipment during operation and improves the stability and service life of the equipment.

[0021] (6) Convenient operation and maintenance: The equipment has a reasonable structural design and each component is easy to install, disassemble and maintain. For example, the coarse powder discharge pipe is fixed by the handwheel and the tightening bolt, which is convenient for adjustment and replacement.

[0022] (7) Better grinding effect and stronger durability: The wear-resistant ridges added to the surface of the roller body increase the contact pressure and shear force between the material and the roller body, effectively solving the problem of slippage caused by insufficient adhesion of the material during the grinding process, and further improving the grinding efficiency; on the other hand, the ridges are made of high wear-resistant alloy material, which has a higher hardness than the roller body, which can reduce the wear on the roller body surface, extend the service life of the roller body, and reduce the replacement frequency of vulnerable parts and maintenance costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a side view of the grinding roller, bushing, and connecting mechanism of the present invention. Figure 4 This is a schematic top view of the grinding disc and grinding roller of the present invention; Figure 5 This is a schematic diagram showing the positional relationship of the grinding rollers on the unfolded surface of the grinding ring in the unfolded planar state of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the grinding disc and grinding roller of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the circular base and grinding disc of the present invention; Figure 8 This is a three-dimensional structural diagram of the air inlet and annular protective shell of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the cage-type separator and the annular partition of the present invention.

[0024] Main symbols: 1. Base, 2. Circular base plate, 3. Shell, 4. Lower cylinder, 5. Grinding disc motor, 6. Grinding disc, 7. Upper cylinder, 8. Circular ring partition, 9. Shell cover, 10. Circular bottom, 11. Ring wall, 12. Grinding ring, 13. Roller shaft, 14. Roller body, 15. Circular air inlet channel, 16. Air inlet hole, 17. Coarse slag scraper, 18. Coarse slag outlet, 19. Coarse slag discharge pipe, 20. Separator motor, 21. Cage separator, 22. Fine powder discharge bin, 23. Fine powder discharge pipe, 24. Circular discharge channel, 25. Circular powder inlet, 26. Circular powder... Export, 27 Coarse powder receiving hopper, 28 Drop hopper, 29 Feed pipe, 30 Feed hopper, 31 Discharge sleeve, 32 Coarse powder discharge pipe, 33 Handwheel tightening bolt, 34 Gear reducer, 35 Hinged 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 centerline, CO roller connecting circle centerline, α roller shaft centerline projection line on the sector plane, β grinding ring inner wall generatrix and horizontal plane angle. Detailed Implementation

[0025] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0026] In the description of this application, it should be understood that the terms "center," "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. For example: the lower end of the roller centerline is inclined towards the rotation direction of the grinding disc. This inclination direction requires the grinding disc to rotate counterclockwise during the grinding operation; it can also be described as: the upper end of the roller centerline is inclined towards the rotation direction of the grinding disc. This inclination direction requires the grinding disc to rotate clockwise during the grinding operation.

[0027] Please see 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, the dimensions of which are designed according to the overall load-bearing requirements of the equipment, and can stably support the entire equipment. A circular base plate 2 is installed on the upper part of the base 1. The circular base plate 2 is made of high-strength cast iron and is tightly connected to the base 1 with bolts.

[0028] The upper part of the circular base plate 2 is connected to the cylindrical shell 3, which is welded from steel plates to form a closed cavity. Inside the cylindrical shell 3, from bottom to top, are arranged the lower cylinder 4, the grinding disc 6, the upper cylinder 7, and the annular partition 8.

[0029] The grinding disc 6 is driven to rotate by the grinding disc motor 5, which is a 150kW variable frequency motor whose speed can be adjusted according to the material grinding requirements. A gear reducer 34 is installed below the circular base 2. The output shaft of the grinding disc motor 5 is connected to the input shaft of the gear reducer 34 via a coupling. The output shaft of the gear reducer 34 is then connected to the central shaft of the grinding disc 6, achieving stable rotation of the grinding disc 6. The grinding disc 6 is a circular groove structure composed of a circular base 10 and an annular wall 11. A grinding ring 12 is installed inside the annular 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 wall surface of the grinding ring and the horizontal plane is 68 degrees.

[0030] Four grinding rollers, each consisting of a roller shaft 13 and a roller body 14, are arranged in a ring on the grinding disc 6. Eight axially extending wear-resistant ridges are evenly distributed on the surface of the roller body 14. The ridges are 2mm high, and the spacing between adjacent ridges is 6mm. The ridges are made of high-chromium alloy and are integrally cast with the roller body 14. The ridges fit tightly against the inner wall of the grinding ring 12, and the material is further crushed during grinding through the shearing action of the ridges. (See also...) Figure 5 The lower end of the roller shaft centerline AB is inclined towards the rotation direction of the grinding disc 6. According to the corresponding positional relationship between the fan-shaped plane unfolded on the inner side of the grinding ring 12 and the roller body 14, the line connecting 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 angle α between the roller connecting center line CO and the projection line of the roller shaft centerline 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 shell 3. Twelve annularly distributed air inlet holes 16, connected to the annular air inlet channel 15, are evenly arranged on the lower part of the shell 3. Two coarse slag scraper plates 17, made of wear-resistant rubber, are installed inside the annular air inlet channel 15 and connected to the outer side of the annular wall 11. A coarse slag outlet 18 is located on the circular base 2 at the bottom of the annular air inlet channel 15. A coarse slag discharge pipe 19 is connected below the coarse slag outlet 18, and the diameter of the coarse slag discharge pipe 19 is designed according to the coarse slag discharge volume.

[0031] A cage-type separator 21, driven to rotate by a separator motor 20, is installed at the lower part of the annular partition 8. The separator motor 20 has a power of 30kW. A fine powder discharge bin 22 is formed between the upper cylindrical shell 3 and the shell cover 9 of the annular partition 8 and the cage-type separator 21. A fine powder discharge pipe 23 is provided on the upper part of the cylindrical shell 3, which connects to the fine powder discharge bin 22. The fine powder discharge pipe 23 is connected to the subsequent induced draft fan and its matching fine powder collection device.

[0032] An annular discharge channel 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 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 8.

[0033] The upper cylinder 7 below the cage separator 21 is equipped with a conical coarse powder receiving hopper 27, and below the coarse powder receiving hopper 27 is a discharge bin 28. The side of the discharge bin 28 is equipped with a feed pipe 29 that penetrates the shell 3 and the upper cylinder 7 and slopes downward at the inner end, and a feed hopper 30 is provided at the outer end of the feed pipe 29. The side of the discharge bin 28 is also equipped with a discharge sleeve 31 that penetrates the shell 3 and the upper cylinder 7 and slopes downward at the outer end. The discharge sleeve 31 is slidably installed inside, and a handwheel tightening bolt 33 that tightens the coarse powder discharge pipe 32 is provided at the outer end of the sleeve 31.

[0034] Adjusting the fixed position of the coarse powder discharge pipe 32 can achieve coarse powder discharge or re-grinding. When the inner port of the discharge sleeve 31 is connected to the lower opening of the coarse powder receiving hopper 27, the coarse powder is discharged through the coarse powder discharge pipe 32 for other purposes; 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.

[0035] Four grinding rollers are mounted on the outer wall of the cylinder shell 3 by elastic mechanisms. These elastic mechanisms include a hinge seat 35, a vertical arm 36, a horizontal arm 37, an air bladder 38, and a bushing 39 that passes through and connects the cylinder shell 3 and the upper cylinder 7, all fixedly connected to the outside of the cylinder shell 3. The middle of the vertical arm 36 is connected to the roller shaft 13 via the horizontal arm 37 passing through the bushing 39. The upper end of the vertical arm 36 is hinged to the hinge seat 35. The lower end of the vertical arm 36 is elastically supported by the air bladder 38, which is located between the cylinder shell 3 and the lower end of the vertical arm 36. The air bladder 38 has an air inlet 40 for connecting to an external air source. A spring damper 41 is installed on the vertical arm 36 between the horizontal arm 37 and the air bladder 38.

[0036] An annular protective shell 42 is provided on the outside of the annularly distributed air inlet 16 and is fastened to the cylindrical shell 3. The protective shell 42 is made of stainless steel and has an air inlet 43.

[0037] 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, which drives the grinding disc 6 to rotate through the gear reducer 34. The material enters the discharge 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, the grinding rollers roll tightly against the grinding ring 12 in the circumferential direction under the action of centrifugal force and their own gravity.

[0038] See Figure 6 The angle between the generatrix of the inner wall of the grinding ring 12 and the horizontal plane is 68 degrees. The grinding disc is set to rotate counterclockwise at 100 r / min. The direction of the resultant force generated by the material's own gravity and centrifugal force is basically perpendicular to the grinding ring, so the material will not be thrown out of the grinding disc by centrifugal force.

[0039] See Figure 4 and Figure 5The grinding disc is selected and installed in a counterclockwise direction. The angle α between the projection lines of the roller connecting circle center line CO and the roller shaft center line AB on the sector plane is 10 degrees. The grinding disc speed is set to 100 r / min and rotates counterclockwise. The roller shaft applies compression and grinding action to 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.

[0040] Material conveying and sorting: The annular protective shell (42) covers the outside of the air inlet (16), forming a closed air inlet channel. Outside 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 16. The coarse slag scraper 17 in the air inlet channel rotates with the grinding disc 6, scraping the ground coarse slag to the coarse slag outlet 18 and discharging it through the coarse slag discharge pipe 19. The ground powder enters the annular discharge channel 24 through the annular powder inlet 25 and moves upward to the annular powder outlet 26. The separator motor 20 drives the cage separator 21 to rotate, and the rotating cage separator 21 sorts the powder. Fine powder that meets the fineness requirements is carried by airflow into the fine powder discharge hopper 22 through the cage separator 21 and discharged through the fine powder discharge pipe 23; coarse powder that does not meet the fineness requirements is blocked outside the cage separator 21 and falls into the coarse powder receiving hopper 27 and is discharged through the coarse powder discharge pipe 32, or falls directly into the circular groove of the grinding disc 6 for further grinding.

[0041] Grinding roller elastic adjustment: An elastic mechanism is installed on the outer wall of the cylinder shell 3. The air bladder 38 is connected to an external pneumatic device. After the air bladder 38 is inflated, it provides upward support 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 bladder 38 can be increased, so that the pressure of the grinding roller on the material increases and the grinding effect is improved. When the material is soft, the air pressure in the air bladder 38 can be appropriately reduced to reduce the wear of the grinding roller. The spring shock absorber 41 can play a shock absorption role when the grinding roller is working, reducing equipment vibration.

[0042] Application Example 1: Limestone was selected as the grinding material. After the equipment was installed and debugged, the grinding disc motor 5 and the separator motor 20 were started, and the grinding disc speed was set to 100 r / min and the separator motor 20 speed was set to 80 r / min. Limestone was added uniformly from the feed hopper 30, and the grinding and sorting process of the material in the equipment was observed through the observation window. After running for a period of time, the finished product discharged from the fine powder discharge pipe 23 was collected. After testing, 95% of the particles in the finished product met the requirements (compared to the structure without the added protrusions, the uniformity of fine powder particle size was improved by 6%), the amount of coarse powder discharged was small, the equipment operated stably, and the grinding efficiency was improved by 4% compared with the original structure.

[0043] Application Example 2: Using pulverized coal as the grinding material. The grinding disc speed was adjusted to 120 r / min, and the separator motor 20 speed was adjusted to 90 r / min. Due to the soft texture of pulverized coal, the air pressure inside the air chamber 38 was appropriately reduced. During operation, the equipment vibration was minimal, and the pulverized coal grinding effect was good. The collected finished product was tested, and the fineness and quality of the pulverized coal met the expected standards. Furthermore, because the raised edges reduced material slippage, the fan energy consumption could be further reduced by 2%–3%, further improving the equipment's adaptability to grinding soft materials.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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 within the scope of the claims and specification of the present invention.

Claims

1. An energy-efficient vertical mill, comprising a base (1), a circular base plate (2) on the upper part of the base (1), and a cylindrical shell (3) connected to the upper part of the circular base plate (2), characterized in that: Inside the cylindrical shell (3), from bottom to top, are arranged a lower cylinder (4), a grinding disc (6) driven to rotate by a grinding disc motor (5), an upper cylinder (7), and a circular partition (8); the upper end of the cylindrical shell (3) is connected to a shell cover (9); the grinding disc (6) is a circular groove structure composed of a circular bottom (10) and an annular wall (11), and a grinding ring (12) is installed on the inner side of the annular wall (11). The angle (β) between the generatrix of the inner wall surface of the grinding ring (12) and the horizontal plane is 45 to 75 degrees. Multiple grinding rollers composed of roller shafts (13) and roller bodies (14) are arranged in a ring on the grinding disc (6). The grinding rollers are tightly attached to the grinding ring (12) circumferentially. The lower end of the center line (AB) of the roller shaft is inclined towards the rotation direction of the grinding disc (6) and is close to the inner side of the grinding ring (12). The corresponding positional relationship between the unfolded fan-shaped plane and the roller (14) is shown. The line connecting the center point of the roller (14) and the center of the fan-shaped plane is called the roller connecting center line (CO). The angle (α) between the roller connecting center line (CO) and the projection line of the roller shaft center line (AB) on the fan-shaped plane is 5 to 20 degrees. The outer periphery of the lower cylinder (4) and the shell (3) form an annular air inlet channel (15). Several annularly distributed air inlet holes (16) connecting the annular air inlet channel (15) are provided at the bottom of the shell (3). 1 to 3 coarse slag scraper plates (17) connecting the outer side of the annular wall (11) are provided inside the annular air inlet channel (15). A coarse slag outlet (18) is provided on the circular bottom plate (2) at the bottom of the annular air inlet channel (15). The coarse slag outlet (18) is connected to the coarse slag discharge pipe (19); the lower part of the annular baffle (8) is a cage separator (21) driven to rotate by the separator motor (20); between the upper part of the annular baffle (8) and the cage separator (21) is the fine powder discharge bin (22); the upper part of the annular baffle (3) and the shell cover (9) is a fine powder discharge bin (22); the upper part of the shell (3) is provided with a fine powder discharge pipe (23) connecting the fine powder discharge bin (22); the outer periphery of the upper cylinder (7) and the shell (3) form an annular discharge channel (24); the lower end of the annular discharge channel (24) and the annular wall (11) have an annular powder inlet (25); the upper end of the annular discharge channel (24) and the annular baffle (8) have an annular powder outlet (26); the cage separator The upper cylinder (7) below the separator (21) is provided with a conical coarse powder receiving hopper (27). Below the coarse powder receiving hopper (27) is a discharge bin (28). The side of the discharge bin (28) is provided with a feed pipe (29) that penetrates the shell (3) and the upper cylinder (7) and is inclined downward on the inner end. The outer end of the feed pipe (29) is provided with a feed hopper (30). The side of the discharge bin (28) is provided with a discharge sleeve (31) that penetrates the shell (3) and the upper cylinder (7) and is inclined downward on the outer end. The inner end of the discharge sleeve (31) is slidably installed to connect with the coarse powder discharge pipe (32) at the lower end of the coarse powder receiving hopper (27). The outer end of the sleeve (31) is provided with a handwheel tightening bolt (33) to tighten the coarse powder discharge pipe (32).

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

3. The energy-saving and high-efficiency vertical mill according to claim 2, characterized in that: The angle (α) between the projection lines of the roller connecting circle center line (CO) and the roller shaft center line (AB) on the sector plane is 8 to 15 degrees.

4. The energy-saving and high-efficiency vertical mill according to claim 1, characterized in that: A gear reducer (34) is provided below the round base plate (2), and the grinding disc motor (5) drives the grinding disc (6) to rotate through the gear reducer (34).

5. A vertical mill with energy efficiency according to claim 1 or 2, characterized in that: The multiple grinding rollers are respectively installed by an elastic mechanism 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 air bladder (38), and a bushing (39) that passes through and connects the cylinder shell (3) and the upper cylinder (7). The middle part of the vertical arm (36) is connected to the roller shaft (13) through the horizontal arm (37) that passes through the bushing (39). The upper end of the vertical arm (36) is hinged to the hinge seat (35). The lower end of the vertical arm (36) is provided with an air bladder (38) that is elastically supported on the cylinder shell (3) and the lower end of the vertical arm (36). The air bladder (38) is provided with an air inlet (40) that connects to an external air source.

6. The energy-saving and high-efficiency vertical mill according to claim 5, characterized in that: A spring shock absorber (41) is installed on the vertical arm (36) between the horizontal arm (37) and the airbag (38).

7. The energy-saving and high-efficiency vertical mill according to claim 1, characterized in that: An annular protective shell (42) is provided on the outside of the annular distribution air inlet (16) and fastened to the cylindrical shell (3). An air inlet (43) is provided on the protective shell (42).

8. The energy-saving and high-efficiency vertical mill according to claim 1, characterized in that: The roller body (14) has several axially extending wear-resistant ridges uniformly arranged on its surface. The height of the ridges is 1 to 3 mm, the spacing between adjacent ridges is 5 to 8 mm, and the ridge material is high chromium alloy or tungsten carbide alloy.

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