Vertical mill slag spitting aggregate screening system

Abstract

The invention provides a vertical mill slag spitting aggregate screening system, which relates to the technical field of aggregate production, and comprises a feeding unit, a coarse screening unit, a storage unit and a backflow unit, according to the system, materials with different particle sizes can be accurately separated through a double-layer screen of the first vibrating screen classifier, the problem of material mixing of a traditional single-stage screen is solved through multi-stage screening, and the aggregate purity is improved; according to the system, materials are distributed to the second conveying pipeline through the first flow dividing piece to lead to the coarse screening unit or the third conveying pipeline to lead to the backflow unit, the material flow direction is controlled, and therefore screening and backflow dual-mode switching is achieved, and the treatment requirements under different working conditions are met; the situation that when a large number of slag spitting materials suddenly occur, the coarse screening unit carries out overload treatment, and consequently shutdown and material clearing are caused is avoided, rapid treatment and flexible dispatching of the slag spitting materials are achieved, and production continuity and stability are guaranteed.

Description

Technical Field

[0001] This application relates to the field of aggregate production technology, and more specifically, to a vertical mill slag discharge aggregate screening system. Background Technology

[0002] Vertical roller mills are ideal large-scale grinding equipment, widely used in industries such as cement, power, metallurgy, chemical, and non-metallic minerals. They integrate crushing, drying, grinding, grading, and conveying, offering high production efficiency and the ability to grind lumpy, granular, and powdery raw materials into the required powdered materials. During the operation of a vertical roller mill, slag discharge is a normal phenomenon. When the material inside the mill is difficult to grind, leading to a deterioration in grinding conditions, or when the system airflow is insufficient, the amount of slag discharged will increase. For large vertical roller mills, the discharged material will be conveyed to a bucket elevator, then transported through the discharge channel, and finally enter the subsequent screening process.

[0003] However, traditional screening systems often use only a single-layer screen, which cannot effectively separate aggregates of different particle sizes in the slag discharge material, making it difficult to meet market demands. Moreover, traditional screening systems often have a small processing capacity, which cannot meet the need to quickly process large amounts of slag discharge material in emergency situations, and may even lead to shutdowns for material cleaning, affecting production efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a vertical mill slag aggregate screening system, which can solve the problems of traditional screening systems that often only use a single-layer screen, which cannot effectively separate aggregates of different particle sizes in the slag material, making it difficult to meet market demands. Moreover, traditional screening systems often have the problem of small processing capacity, which cannot meet the need to quickly process large amounts of slag material in emergency situations, and may even lead to shutdown for cleaning, affecting production efficiency.

[0005] This application provides a vertical mill slag discharge aggregate screening system, including a feeding unit, a coarse screening unit, a storage unit, and a reflux unit;

[0006] The feeding unit includes a first diverter, the feeding end of the first diverter is connected to a first conveying pipe, the first conveying pipe is connected to the discharge end of the bucket elevator, and the discharge end of the first diverter is connected to a second conveying pipe and a third conveying pipe.

[0007] The coarse screening unit includes a first vibrating screen, a second conveying pipe connected to the feed end of the first vibrating screen, the first vibrating screen is provided with upper and lower screens, the upper screen discharge end of the first vibrating screen is connected to a fourth conveying pipe, the lower screen discharge end of the first vibrating screen is connected to a fifth conveying pipe, and the bottom discharge end of the first vibrating screen is connected to a sixth conveying pipe.

[0008] The storage unit includes a first storage bin, and the fifth conveying pipe is connected to the inlet end of the first storage bin;

[0009] The reflux unit includes a reflux chamber, and the third conveying pipe is connected to the feed end of the reflux chamber.

[0010] The discharge end of the first storage silo is connected to a first external discharge pipe and a second external discharge pipe. A first valve is installed on both the first external discharge pipe and the second external discharge pipe. The first external discharge pipe and the second external discharge pipe are used for loading and shipping and external storage, respectively.

[0011] The fourth conveying pipe and the sixth conveying pipe are both connected to the inlet end of the reflux chamber. The outlet end of the reflux chamber is connected to a discharge pipe, which is equipped with a second valve and is used for reflux material.

[0012] The system also includes a fine screening unit, which comprises a second vibrating screen, a second diverter, a second storage bin, and a third storage bin. The feed end of the second diverter is connected to the sixth conveying pipe, and the discharge end of the second diverter is connected to a seventh conveying pipe and an eighth conveying pipe. The seventh conveying pipe is connected to the feed end of the second vibrating screen, and the eighth conveying pipe is connected to the feed end of the return bin. A ninth conveying pipe is provided between the screen discharge end of the second vibrating screen and the feed end of the second storage bin, and a tenth conveying pipe is provided between the bottom discharge end of the second vibrating screen and the feed end of the third storage bin.

[0013] The system also includes a dust removal unit, which comprises a dust collector and multiple dust collection hoods. The corresponding dust collection hoods are located at the feed and discharge ends of the first vibrating screen, the feed and discharge ends of the first storage silo, the feed and discharge ends of the return silo, the feed and discharge ends of the second vibrating screen, the feed end of the second storage silo, and the feed end of the third storage silo. A dust collection pipe is provided between the dust collector and the dust collection hoods, and a fan is installed on the dust collection pipe.

[0014] The first diverter and the second diverter both adopt a three-way feed valve or a double-channel pneumatic bar valve, and the first valve and the second valve both adopt a gate valve.

[0015] The first discharge pipe is equipped with a truck for loading and shipping, the second discharge pipe is equipped with a first belt conveyor for conveying materials to external storage, and the discharge pipe is equipped with a second belt conveyor for conveying materials back to the vertical mill.

[0016] The upper screen of the first vibrating screen has a screen aperture of 30mm, the lower screen of the first vibrating screen has a screen aperture of 20mm, and the screen of the second vibrating screen has a screen aperture of 10mm.

[0017] The upper screen of the first vibrating screen is a bar screen, while the lower screen of the first vibrating screen and the screens of the second vibrating screen are both polyurethane screens.

[0018] Material level sensors are installed in the first storage silo, the return silo, the second storage silo, and the third storage silo, and the material level sensors are electrically connected to an external controller.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a vertical mill aggregate screening system for slag discharge. This system can accurately separate materials of different particle sizes through the double-layer screen of the first vibrating screen. By using multi-stage screening, it avoids the mixing problem of traditional single-stage screening and improves the purity of aggregates. The system distributes materials to the second conveying pipe through the first diverter, which leads to the coarse screening unit, or to the third conveying pipe, which leads to the return unit. By controlling the material flow direction, it can achieve dual-mode switching between screening and return, adapting to the processing needs under different working conditions. It prevents the coarse screening unit from being overloaded and having to stop for cleaning when a large amount of slag discharge occurs suddenly. It enables rapid processing and flexible scheduling of slag discharge materials, ensuring the continuity and stability of production. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure in some embodiments of this application;

[0023] Figure 2 This is a schematic diagram of the overall structure of the hidden dust removal unit in some embodiments of this application.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Feeding unit; 11. First diverter; 12. First conveying pipe; 13. Bucket elevator; 14. Second conveying pipe; 15. Third conveying pipe;

[0026] 2. Coarse screening unit; 21. First vibrating screen; 22. Fourth conveying pipe; 23. Fifth conveying pipe; 24. Sixth conveying pipe;

[0027] 3. Storage unit; 31. First storage bin; 32. First external discharge pipe; 33. Second external discharge pipe; 34. First valve; 35. Truck; 36. First belt conveyor;

[0028] 4. Reflux unit; 41. Reflux bin; 42. Discharge pipe; 43. Second valve; 44. Second belt conveyor;

[0029] 5. Fine screening unit; 51. Second vibrating screen; 52. Second diverter; 53. Second storage bin; 54. Third storage bin; 55. Seventh conveying pipe; 56. Eighth conveying pipe; 57. Ninth conveying pipe; 58. Tenth conveying pipe;

[0030] 6. Dust removal unit; 61. Dust collector; 62. Dust collection hood; 63. Dust collection duct. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] like Figure 1 and 2 As shown in the figure, this application provides a vertical mill slag discharge aggregate screening system, including a feeding unit 1, a coarse screening unit 2, a storage unit 3, and a return unit 4;

[0038] The feeding unit 1 includes a first diverter 11, the feeding end of the first diverter 11 is connected to a first conveying pipe 12, the first conveying pipe 12 is connected to the discharge end of the bucket elevator 13, and the discharge end of the first diverter 11 is connected to a second conveying pipe 14 and a third conveying pipe 15.

[0039] The coarse screening unit 2 includes a first vibrating screen 21, a second conveying pipe 14 connected to the feed end of the first vibrating screen 21, the first vibrating screen 21 is provided with upper and lower screens, the upper screen discharge end of the first vibrating screen 21 is connected to a fourth conveying pipe 22, the lower screen discharge end of the first vibrating screen 21 is connected to a fifth conveying pipe 23, and the bottom discharge end of the first vibrating screen 21 is connected to a sixth conveying pipe 24.

[0040] The storage unit 3 includes a first storage bin 31, and a fifth conveying pipe 23 is connected to the inlet end of the first storage bin 31;

[0041] The reflux unit 4 includes a reflux chamber 41, and a third conveying pipe 15 is connected to the feed end of the reflux chamber 41.

[0042] During operation, the slag material from the vertical mill is conveyed to the bucket elevator 13, and then fed into the first conveying pipe 12 from the discharge port of the bucket elevator 13. The second conveying pipe 14 is opened and the third conveying pipe 15 is closed through the first diverter 11. The slag material is then fed into the first vibrating screen 21 from the second conveying pipe 14 for screening. The first particle size material intercepted on the upper screen is then discharged from the fourth conveying pipe 22. The second particle size material intercepted on the lower screen is then fed into the first storage bin 31 from the fifth conveying pipe 23. The qualified aggregate in the first storage bin 31 awaits subsequent transportation. The third particle size material passing through the upper and lower screens is then discharged from the sixth conveying pipe 24.

[0043] When the amount of slag discharged from the vertical mill suddenly increases, the third conveying pipe 15 can be opened and the second conveying pipe 14 can be closed through the first diverter 11. The slag discharged material is then sent from the second conveying pipe 14 into the return chamber 41 for subsequent re-entry into the mill, forming a circulation path.

[0044] This system can accurately separate materials of different particle sizes through the double-layer screen of the first vibrating screen 21. By using multi-stage screening, it avoids the mixing problem of traditional single-stage screening and improves the purity of aggregates. The system distributes materials to the second conveying pipe 14 through the first diverter 11, which leads to the coarse screening unit 2, or to the third conveying pipe 15, which leads to the return unit 4. It controls the flow of materials to achieve dual-mode switching between screening and return, adapting to the processing needs under different working conditions. It prevents the coarse screening unit 2 from being overloaded and having to stop for cleaning when a large amount of slag is discharged suddenly. It achieves rapid processing and flexible scheduling of slag discharge materials, ensuring the continuity and stability of production.

[0045] like Figure 1 and 2 As shown in this embodiment, the discharge end of the first storage silo 31 is connected to a first external discharge pipe 32 and a second external discharge pipe 33. A first valve 34 is provided on both the first external discharge pipe 32 and the second external discharge pipe 33. The first external discharge pipe 32 and the second external discharge pipe 33 are used for loading and shipping and external storage, respectively.

[0046] In operation, the first valve 34 on the first discharge pipe 32 can be opened to allow qualified aggregate in the first storage bin 31 to be discharged from the first discharge pipe 32 and directly loaded onto trucks for shipment. When the amount of slag discharged from the vertical mill suddenly increases and exceeds the system's normal processing capacity, or when the transfer of qualified aggregate is not timely and the material level in the first storage bin 31 is too high, the first valve 34 on the first discharge pipe 32 can be opened to allow qualified aggregate in the first storage bin 31 to be discharged from the second discharge pipe 33 and transported to the external storage area. This system improves flexibility by setting up dual-channel discharge, ensuring that materials can be processed quickly in emergency situations, avoiding material accumulation, and building an efficient and flexible material discharge system, which effectively guarantees the continuity and stability of production.

[0047] like Figure 1 and 2 As shown, in this embodiment, the fourth conveying pipe 22 and the sixth conveying pipe 24 are both connected to the inlet end of the reflux chamber 41. The outlet end of the reflux chamber 41 is connected to the discharge pipe 42, and the discharge pipe 42 is equipped with a second valve 43. The discharge pipe 42 is used for reflux material.

[0048] When in use, if the first and third particle sizes are not needed, the fourth conveying pipe 22 and the sixth conveying pipe 24 can be connected to the return chamber 41. The first particle size material intercepted on the upper screen is then sent into the return chamber 41 through the fourth conveying pipe 22, and the third particle size material passing through the upper and lower screens is then sent into the return chamber 41 through the sixth conveying pipe 24. When a certain amount of material to be returned accumulates in the return chamber 41, the second valve 43 on the discharge pipe 42 can be opened to allow the slag material in the return chamber 41 to be discharged from the discharge pipe 42 and returned to the mill, forming a circulation path.

[0049] This system can return unqualified materials to the vertical mill for reprocessing, improving material utilization, reducing material waste, and lowering production costs. Moreover, by setting up a return bin 41 as an intermediate buffer, the system can flexibly respond to fluctuations in material output, balance the processing volume of each unit, and avoid production interruptions such as shutdowns for material cleaning due to material accumulation, thus ensuring the continuity and stability of production. The return bin 41 also centrally collects materials to be recycled, undertaking the important responsibility of collecting and temporarily storing materials to be returned, which facilitates subsequent unified return processing.

[0050] like Figure 1 and 2As shown, this embodiment also includes a fine screening unit 5, which includes a second vibrating screen 51, a second diverter 52, a second storage bin 53, and a third storage bin 54. The feed end of the second diverter 52 is connected to the sixth conveying pipe 24, and the discharge end of the second diverter 52 is connected to the seventh conveying pipe 55 and the eighth conveying pipe 56. The seventh conveying pipe 55 is connected to the feed end of the second vibrating screen 51, and the eighth conveying pipe 56 is connected to the feed end of the return bin 41. A ninth conveying pipe 57 is provided between the screen discharge end of the second vibrating screen 51 and the feed end of the second storage bin 53, and a tenth conveying pipe 58 is provided between the bottom discharge end of the second vibrating screen 51 and the feed end of the third storage bin 54.

[0051] When in use, if finer aggregate is required, the seventh conveying pipe 55 is opened and the eighth conveying pipe 56 is closed through the second diverter 52. The third-sized material in the sixth conveying pipe 24 is then sent to the second vibrating screen 51 for screening through the seventh conveying pipe 55. The fourth-sized material intercepted on the screen is then sent to the second storage bin 53 through the ninth conveying pipe 57. The fifth-sized material that passes through the screen is then sent to the third storage bin 54 through the tenth conveying pipe 58. The qualified aggregate in the second storage bin 53 and the third storage bin 54 awaits subsequent external transportation.

[0052] If it is not necessary to prepare finer aggregate, the eighth conveying pipe 56 is opened and the seventh conveying pipe 55 is closed through the second diverter 52, and the third-sized material in the sixth conveying pipe 24 is then sent from the eighth conveying pipe 56 into the return chamber 41.

[0053] This system further screens the fine materials at the bottom discharge end of the coarse screening unit 2 by setting up a fine screening unit 5, thereby improving the screening accuracy and achieving fine separation of material particle size to meet the market demand for aggregates of different particle sizes. At the same time, it expands the system's functions and can simultaneously prepare coarse and fine materials to maximize the value of aggregates. The system distributes materials to the seventh conveying pipe 55 through the second diverter 52, which leads to the fine screening unit 5, or to the eighth conveying pipe 56, which leads to the return unit 4. It controls the material flow direction to achieve dual-mode switching between fine screening and return, adapting to the processing needs under different working conditions. It prevents the fine screening unit 5 from being overloaded and having to stop for cleaning when a large amount of slag is discharged suddenly. It achieves rapid processing and flexible scheduling of slag discharge materials, ensuring the continuity and stability of production.

[0054] like Figure 1 and 2As shown, in this embodiment, a dust removal unit 6 is also included. The dust removal unit 6 includes a dust collector 61 and multiple dust collection hoods 62. The corresponding dust collection hoods 62 are respectively located at the feed end and discharge end of the first vibrating screen 21, the feed end and discharge end of the first storage silo 31, the feed end and discharge end of the return silo 41, the feed end and discharge end of the second vibrating screen 51, the feed end of the second storage silo 53, and the feed end of the third storage silo 54. A dust collection pipe 63 is provided between the dust collector 61 and the dust collection hoods 62, and a fan is provided on the dust collection pipe 63.

[0055] During use, dust collection hoods 62 are installed at key dust-generating points in the system, such as the feed and discharge ends of the first vibrating screen 21, the feed and discharge ends of the first storage silo 31, the feed and discharge ends of the return silo 41, the feed and discharge ends of the second vibrating screen 51, the feed end of the second storage silo 53, and the feed end of the third storage silo 54. The fans are turned on to transport the dust from each dust point to the dust collector 61 through the dust collection pipes 63 for treatment, and the dust is discharged after meeting the standards. The system achieves comprehensive collection and efficient treatment of dust generated by each unit by setting up the dust removal unit 6, effectively reducing dust pollution, protecting the health of operators, improving the working environment, and meeting environmental protection requirements.

[0056] like Figure 1 and 2 As shown, in this embodiment, the first diverter 11 and the second diverter 52 are both three-way diverter valves or double-channel pneumatic bar valves, and the first valve 34 and the second valve 43 are both gate valves.

[0057] like Figure 1 and 2 As shown, in this embodiment, a truck 35 for loading and shipping is provided below the first external discharge pipe 32, a first belt conveyor 36 for conveying materials to external storage is provided below the second external discharge pipe 33, and a second belt conveyor 44 for conveying materials back to the vertical mill is provided below the discharge pipe 42.

[0058] In use, qualified aggregates discharged from the first external discharge pipe 32 are loaded and shipped by truck 35, qualified aggregates discharged from the second external discharge pipe 33 are transported to the external storage area by the first belt conveyor 36, and unqualified materials discharged from the discharge pipe 42 are transported back to the mill by the second belt conveyor 44.

[0059] like Figure 1 and 2 As shown, in this embodiment, the screen aperture of the upper screen of the first vibrating screen 21 is 30mm, the screen aperture of the lower screen of the first vibrating screen 21 is 20mm, and the screen aperture of the screen of the second vibrating screen 51 is 10mm.

[0060] The sieve aperture size is determined according to the aggregate particle size requirements to ensure effective separation of materials of different particle sizes, improve product quality and purity, and meet diverse market demands.

[0061] like Figure 1 and 2 As shown, in this embodiment, the upper screen of the first vibrating screen 21 is a bar screen, and the lower screen of the first vibrating screen 21 and the screen of the second vibrating screen 51 are both polyurethane screens.

[0062] Bar screens are resistant to large impacts and prevent clogging, making them suitable for screening large particles. Polyurethane screens are wear-resistant and corrosion-resistant, making them suitable for screening fine particles. The combined use of bar screens and polyurethane screens not only meets the screening requirements for large particles but also improves the screening accuracy and screen lifespan for fine particles.

[0063] like Figure 1 and 2 As shown in this embodiment, material level sensors are installed in the first storage bin 31, the return bin 41, the second storage bin 53, and the third storage bin 54. The material level sensors are electrically connected to an external controller.

[0064] The material level sensor can monitor the material level in real time and transmit the material level information to the external controller for processing, realizing automatic control and alarm functions of the material. The system can automatically adjust the material processing volume to avoid material overflow or shortage, so that the material supply of the entire system is always kept within a stable and reasonable range, thereby improving the system's automation level and operational stability.

[0065] Working principle: In use, the vertical mill slag discharge aggregate screening system provided in this application delivers slag discharge material to the bucket elevator 13, and then from the outlet of the bucket elevator 13 into the first conveying pipe 12. The second conveying pipe 14 is opened and the third conveying pipe 15 is closed through the first diverter 11. The slag discharge material is then sent from the second conveying pipe 14 to the first vibrating screen 21 for screening. The first particle size material (>30mm) intercepted on the upper screen is then sent from the fourth conveying pipe 22 into the return chamber 41, where it is intercepted in the lower layer. The second-sized material (20-30mm) on the screen is then fed into the first storage bin 31 through the fifth conveying pipe 23. The qualified aggregate in the first storage bin 31 awaits subsequent external transport. The third-sized material (<20mm) passing through the upper and lower screens then enters the sixth conveying pipe 24. If it is not necessary to prepare finer aggregate, the eighth conveying pipe 56 is opened and the seventh conveying pipe 55 is closed through the second diverter 52. The third-sized material (<20mm) in the sixth conveying pipe 24 is then fed into the return bin 41 through the eighth conveying pipe 56.

[0066] If finer aggregate is required, the seventh conveying pipe 55 is opened and the eighth conveying pipe 56 is closed through the second diverter 52. The third-sized material (<20mm) in the sixth conveying pipe 24 is then sent to the second vibrating screen 51 for screening through the seventh conveying pipe 55. The fourth-sized material (10-20mm) intercepted on the screen is then sent to the second storage silo 53 through the ninth conveying pipe 57. The fifth-sized material (<10mm) that passes through the screen is then sent to the third storage silo 54 through the tenth conveying pipe 58. The qualified aggregate in the second storage silo 53 and the third storage silo 54 awaits subsequent external transportation.

[0067] When the amount of slag discharged from the vertical mill suddenly increases, the third conveying pipe 15 can be opened and the second conveying pipe 14 can be closed through the first diverter 11. The slag discharged material is then sent from the second conveying pipe 14 into the return chamber 41 for subsequent re-entry into the mill, forming a circulation path.

[0068] The first valve 34 on the first external discharge pipe 32 can be opened to allow qualified aggregate in the first storage bin 31 to be discharged from the first external discharge pipe 32 and directly loaded onto truck 35 for shipment. When the amount of slag discharged from the vertical mill suddenly increases and exceeds the system's normal processing capacity, or when the transfer of qualified aggregate is not timely and the material level in the first storage bin 31 is too high, the first valve 34 on the first external discharge pipe 32 can be opened to allow qualified aggregate in the first storage bin 31 to be discharged from the second external discharge pipe 33 and transported to the external storage area by the first belt conveyor 36. When a certain amount of material to be returned accumulates in the return bin 41, the second valve 43 on the discharge pipe 42 can be opened to allow the slag discharged from the return bin 41 to be discharged from the discharge pipe 42 and transported back to the mill by the second belt conveyor 44, forming a circulation path.

[0069] Dust collection hoods 62 are installed at key parts of the system that are prone to dust generation, such as the feed and discharge ends of the first vibrating screen 21, the feed and discharge ends of the first storage silo 31, the feed and discharge ends of the return silo 41, the feed and discharge ends of the second vibrating screen 51, the feed end of the second storage silo 53, and the feed end of the third storage silo 54. The fans are turned on to transport the dust from each dust point to the dust collector 61 through the dust collection pipe 63 for treatment, and the dust is discharged after meeting the standards.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vertical mill slag discharge aggregate screening system, characterized in that: It includes a feeding unit (1), a coarse screening unit (2), a storage unit (3), and a reflux unit (4); The feeding unit (1) includes a first diverter (11), the feeding end of the first diverter (11) is connected to a first conveying pipe (12), the first conveying pipe (12) is connected to the discharge end of the bucket elevator (13), and the discharge end of the first diverter (11) is connected to a second conveying pipe (14) and a third conveying pipe (15). The coarse screening unit (2) includes a first vibrating screen (21), and the second conveying pipe (14) is connected to the feed end of the first vibrating screen (21). The first vibrating screen (21) is provided with upper and lower screens. The upper screen of the first vibrating screen (21) is connected to a fourth conveying pipe (22), the lower screen of the first vibrating screen (21) is connected to a fifth conveying pipe (23), and the bottom screen of the first vibrating screen (21) is connected to a sixth conveying pipe (24). The storage unit (3) includes a first storage bin (31), and the fifth conveying pipe (23) is connected to the inlet end of the first storage bin (31); The reflux unit (4) includes a reflux chamber (41), and the third conveying pipe (15) is connected to the feed end of the reflux chamber (41).

2. The vertical mill slag discharge aggregate screening system according to claim 1, characterized in that: The discharge end of the first storage silo (31) is connected to a first external discharge pipe (32) and a second external discharge pipe (33). A first valve (34) is provided on both the first external discharge pipe (32) and the second external discharge pipe (33). The first external discharge pipe (32) and the second external discharge pipe (33) are used for loading and shipping and external storage, respectively.

3. The vertical mill slag discharge aggregate screening system according to claim 2, characterized in that: The fourth conveying pipe (22) and the sixth conveying pipe (24) are both connected to the inlet end of the return chamber (41). The outlet end of the return chamber (41) is connected to a discharge pipe (42). A second valve (43) is provided on the discharge pipe (42), and the discharge pipe (42) is used for returning materials.

4. The vertical mill slag discharge aggregate screening system according to claim 3, characterized in that: It also includes a fine screening unit (5), which includes a second vibrating screen (51), a second diverter (52), a second storage bin (53), and a third storage bin (54). The feed end of the second diverter (52) is connected to the sixth conveying pipe (24). The discharge end of the second diverter (52) is connected to a seventh conveying pipe (55) and an eighth conveying pipe (56). The seventh conveying pipe (55) is connected to the feed end of the second vibrating screen (51). The eighth conveying pipe (56) is connected to the feed end of the return bin (41). A ninth conveying pipe (57) is provided between the screen discharge end of the second vibrating screen (51) and the feed end of the second storage bin (53). A tenth conveying pipe (58) is provided between the bottom discharge end of the second vibrating screen (51) and the feed end of the third storage bin (54).

5. The vertical mill slag discharge aggregate screening system according to claim 4, characterized in that: It also includes a dust removal unit (6), which includes a dust collector (61) and multiple dust collection hoods (62). The corresponding dust collection hoods (62) are respectively located at the feed end and discharge end of the first vibrating screen (21), the feed end and discharge end of the first storage bin (31), the feed end and discharge end of the return bin (41), the feed end and discharge end of the second vibrating screen (51), the feed end of the second storage bin (53), and the feed end of the third storage bin (54). A dust collection pipe (63) is provided between the dust collector (61) and the dust collection hoods (62), and a fan is provided on the dust collection pipe (63).

6. The vertical mill slag discharge aggregate screening system according to claim 5, characterized in that: The first diverter (11) and the second diverter (52) are both three-way feed valves or double-channel pneumatic bar valves, and the first valve (34) and the second valve (43) are both gate valves.

7. The vertical mill slag discharge aggregate screening system according to claim 5, characterized in that: A truck (35) for loading and shipping is provided below the first external discharge pipe (32), a first belt conveyor (36) for conveying materials to external storage is provided below the second external discharge pipe (33), and a second belt conveyor (44) for conveying materials back to the vertical mill is provided below the discharge pipe (42).

8. The vertical mill slag discharge aggregate screening system according to claim 5, characterized in that: The upper screen of the first vibrating screen (21) has a screen hole diameter of 30mm, the lower screen of the first vibrating screen (21) has a screen hole diameter of 20mm, and the screen of the second vibrating screen (51) has a screen hole diameter of 10mm.

9. The vertical mill slag discharge aggregate screening system according to claim 5, characterized in that: The upper screen of the first vibrating screen (21) is a bar screen, and the lower screen of the first vibrating screen (21) and the screen of the second vibrating screen (51) are both polyurethane screens.

10. The vertical mill slag discharge aggregate screening system according to claim 5, characterized in that: Material level sensors are installed in the first storage bin (31), the return bin (41), the second storage bin (53), and the third storage bin (54), and the material level sensors are electrically connected to an external controller.

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