Screening apparatus based on comprehensive utilization of fly ash

Abstract

The utility model relates to a kind of screening equipment based on fly ash comprehensive utilization, including the fine material bin of hollow cylindrical structure, fine material bin is transversely fixed support by with it compatible support frame, the conical discharge hopper is butt-jointed with the radial communication of fine material bin bottom;The feed end and discharge end of fine material bin are respectively axially opened with round hole one and round hole two, the screen cylinder with hollow is cooperated with the axial gap between round hole one and round hole two, and the screen cylinder outer wall axially detachably sleeve joint cooperation has screen, screen cylinder feed port is axially transmission butt-jointed with the overflow port of ball mill by with it compatible flange;The discharge end of fine material bin is axially integrated butt-jointed with coarse material bin, and the inclinedly arranged material sliding pipe is butt-jointed with the radial communication of coarse material bin bottom.This utility model reduces the power consumption of equipment in the process of operation, significantly saves energy cost, reduces the floor area of entire grinding system, reduces maintenance cost and maintenance complexity due to equipment component reduction.

Description

Technical Field

[0001] This utility model belongs to the field of fly ash processing technology, and specifically relates to screening equipment based on the comprehensive utilization of fly ash. Background Technology

[0002] Fly ash is mainly produced in areas with a high concentration of coal-fired power plants. Comprehensive utilization of fly ash is crucial to addressing issues such as land occupation and environmental pollution caused by its accumulation, and to turning waste into treasure, promoting resource recycling and green development. Fly ash collected from coal-fired power plants typically requires grinding in a ball mill to mechanically pulverize the porous glassy material, reducing water demand and increasing the fineness and chemical reactivity of the fly ash, facilitating subsequent graded resource utilization.

[0003] The main process of fly ash grinding and processing is to take ash from the coarse ash silo and feed it into the ball mill for grinding in a uniform and quantitative manner through a feeder. The ground material can be used directly as a product, or it can be separated by screening equipment, with fine powder and coarse powder used as different products.

[0004] However, existing screening equipment requires independent power to drive it, resulting in high energy costs. It also requires a lot of auxiliary equipment, occupies a large area, and has high investment and maintenance costs, making it unsuitable for use with small and medium-sized ball mills. Utility Model Content

[0005] The purpose of this utility model is to overcome one of the problems existing in the prior art, and to provide a screening device based on the comprehensive utilization of fly ash. The specific technical solution is as follows: This utility model provides a screening device based on the comprehensive utilization of fly ash. The screening device is axially connected to the overflow port of a ball mill. The screening device includes a hollow cylindrical fine material bin, which is laterally fixed and supported by a matching support frame. A conical discharge hopper is radially connected to the bottom of the fine material bin. The feed end and discharge end of the fine material bin are respectively axially provided with a first circular hole and a second circular hole. A perforated screen cylinder is fitted through the axial gap between the first circular hole and the second circular hole, and a screen mesh is axially detachably fitted to the outer wall of the screen cylinder. The feed port of the screen cylinder is axially driven and connected to the overflow port of the ball mill through a matching flange. A coarse material bin is axially integrally connected to the discharge end of the fine material bin, and an inclined chute is radially connected to the bottom of the coarse material bin.

[0006] As a preferred embodiment of this utility model, the discharge port of the screen cylinder is axially and detachably connected to a feed end pipe, and the feed end pipe extends into the coarse material bin.

[0007] As a preferred embodiment of this utility model, two annular protrusions are integrally and spaced apart on the feed end tube, and the outer diameter of the annular protrusions is larger than the inner diameter of the two circular holes; wherein, the annular protrusion located on the inner side is in close contact with the discharge end face of the fine material bin, and the annular protrusion located on the outer side is flush with the edge of the discharge port of the feed end tube.

[0008] As a preferred embodiment of this utility model, the flange axial clearance of the feed inlet of the screen cylinder is fitted inside the circular hole.

[0009] As a preferred embodiment of this utility model, a limiting component is axially sleeved on the outside of the feed end tube; the limiting component includes an annular pad, which is axially and detachably attached to the discharge end face of the fine material bin, and the annular pad is axially and gap-fitted with an annular protrusion located on the inner side of the feed end tube; the outer ring surface of the annular pad is axially and vertically connected to a limiting tube, and the outer opening of the limiting tube is axially and detachably sealed with a retaining ring, and the retaining ring is axially and gap-fitted with an annular protrusion located on the outer side of the feed end tube; at least four limiting wheels are circumferentially and rotatably connected between the annular pad and the retaining ring, and the limiting wheels are rollingly attached to the outer peripheral wall of the feed end tube.

[0010] As a preferred technical solution of this utility model, the outer end face of the coarse material bin is axially and detachably equipped with a matching sealing plate.

[0011] As a preferred technical solution of this utility model, the top two ends of the fine material bin are vertically and symmetrically connected with suspension rods, and a brush roller is rotatably connected between the two suspension rods, and the bottom of the brush roller is in rolling contact with the screen at the top of the screen cylinder.

[0012] As a preferred technical solution of this utility model, the top of the fine material bin is provided with an observation port in the radial direction. The observation port is sealed by an observation door that is adapted to it. The two ends of one long edge of the observation door are respectively hinged to the outer wall of the fine material bin by symmetrically arranged hinges, and a handle is provided in the middle of the other long edge.

[0013] As a preferred embodiment of this utility model, the inner wall of the screen cylinder is provided with a plurality of intermittent spiral blades adapted to its rotation direction.

[0014] The beneficial effects of this utility model are: 1. The screening equipment of this utility model does not require a separate drive motor or power source; the power of the screen cylinder comes directly from the rotational power of the ball mill main shaft. When the ball mill is working, its cylinder itself rotates continuously. This screening equipment utilizes this existing motion, transmitting the rotational motion to the screen cylinder through a transmission connection, causing it to rotate synchronously. In this way, the screening equipment eliminates the need for a separate drive unit, thereby significantly reducing the power consumption during operation and saving energy costs.

[0015] 2. The screening equipment of this utility model is directly axially connected to the ball mill, making it an extension of the ball mill and forming a compact module integrating grinding and sorting. This reduces the need for piping connections, conveying equipment, and independent installation foundations required by traditional independent screening systems, thereby effectively reducing the footprint of the entire grinding system. Simultaneously, by eliminating the independent drive unit, complex conveying mechanism, and auxiliary equipment, the overall system configuration is simplified. This not only reduces manufacturing costs but also correspondingly reduces maintenance costs and complexity due to the reduced number of equipment components.

[0016] 3. This utility model's screening equipment, when used in conjunction with a ball mill, achieves continuous, automated grinding and screening operations. After grinding within the ball mill, the material immediately enters the screening process without intermediate transfer, improving the efficiency and continuity of the entire production process. Through the physical separation design of the fine and coarse material bins, two products with different fineness specifications can be produced simultaneously, meeting market demand for different grades of fly ash products and realizing the refined and graded utilization of resources. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of the screening equipment of this utility model is shown; Figure 2 An exploded view of the sieve cylinder and the limiting component in this utility model is shown. Figure 3 A top view of the screening equipment structure of this utility model is shown; Figure 4 It shows Figure 3 Cross-sectional view of the structure along the AA direction; Figure 5 A three-dimensional structural diagram of the screening equipment of this utility model without the screen cylinder and limiting components is shown. Figure 6 A three-dimensional structural diagram of the sieve cylinder installed in the screening equipment of this utility model is shown; Figure 7 A three-dimensional structural diagram of the screening equipment of this utility model showing the installation of the screen cylinder and the limiting component; Figure 8 A three-dimensional structural diagram of a ball mill in the prior art is shown; Figure 9 This diagram shows a three-dimensional structural schematic of the screening equipment of this utility model after assembly with a ball mill; The diagram shows: 1. Fine material bin; 11. Discharge hopper; 12. Observation door; 121. Hinge; 122. Handle; 13. Round hole one; 14. Round hole two; 2. Coarse material bin; 21. Chute pipe; 22. Sealing plate; 3. Screen cylinder; 31. Flange; 32. Feeding end pipe; 321. Annular convex rib; 4. Support frame; 5. Limiting assembly; 51. Annular pad; 52. Limiting pipe; 53. Retaining ring; 54. Limiting wheel; 6. Brush roller; 61. Suspension rod; 7. Ball mill; 71. Overflow port. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model. Example 1

[0019] To address the technical problems in the background section, the following screening equipment based on the comprehensive utilization of fly ash is proposed: Combination Figures 1-9 As shown, the screening equipment based on the comprehensive utilization of fly ash is axially connected to the overflow port 71 of the ball mill 7. The screening equipment includes a hollow cylindrical fine material bin 1, which is laterally fixed and supported by a matching support frame 4. The bottom of the fine material bin 1 is radially connected to a conical discharge hopper 11. The feed end and discharge end of the fine material bin 1 are respectively axially provided with a first circular hole 13 and a second circular hole 14. A hollow screen cylinder 3 is fitted through the axial gap between the first circular hole 13 and the second circular hole 14, and a screen mesh (not shown in the figure) is axially detachably fitted on the outer wall of the screen cylinder 3. The feed port of the screen cylinder 3 is axially connected to the overflow port 71 of the ball mill 7 through a matching flange 31. The discharge end of the fine material bin 1 is axially integrally connected to a coarse material bin 2, and the bottom of the coarse material bin 2 is radially connected to an inclined chute 21.

[0020] In the above technical solution, the feed inlet of the screen cylinder 3 in the screening equipment is axially driven to the overflow port 71 of the ball mill 7 via a matching flange 31, eliminating the need for a separate drive motor or power source. The power of the screen cylinder 3 comes directly from the rotational power of the main shaft of the ball mill 7. During operation, the ball mill 7 itself rotates continuously. This screening equipment utilizes this existing motion, transmitting the rotational motion to the screen cylinder 3 through the drive connection, causing it to rotate synchronously. This eliminates the need for a separate drive unit, significantly reducing energy consumption during operation and saving energy costs.

[0021] The screening equipment is directly axially connected to the ball mill 7, making it an extension of the ball mill 7 and forming a compact module integrating grinding and sorting. This reduces the need for piping connections, conveying equipment, and independent installation foundations required by traditional independent screening systems, thereby effectively reducing the footprint of the entire grinding system. At the same time, by eliminating the independent drive unit, complex conveying mechanism, and auxiliary equipment, the overall system configuration is simplified. This not only reduces manufacturing costs but also correspondingly reduces maintenance costs and complexity due to the reduction in equipment components.

[0022] In this screening equipment, after the material exits the ball mill 7, it directly enters the rotating screen cylinder 3. Fine particles are screened through the screen of the screen cylinder 3 and fall into the fine material bin 1 below, and are finally collected and discharged by the discharge hopper 11. Coarse powder that fails to pass through the screen is carried by the rotation of the screen cylinder 3 to the coarse material bin 2 at the end and discharged through the inclined chute 21. This screening equipment, in conjunction with the ball mill 7, achieves continuous, automated grinding and screening operations. After grinding in the ball mill 7, the material immediately enters the screening process without intermediate transfer, improving the efficiency and continuity of the entire production process. Through the physical separation design of the fine material bin 1 and the coarse material bin 2, two products with different fineness specifications can be produced simultaneously, meeting the market demand for different grades of fly ash products and realizing the refined and graded utilization of resources.

[0023] As a consumable part, the screen mesh needs to be replaced or cleaned regularly. The detachable design allows maintenance personnel to easily remove the screen mesh from the screen cylinder 3 for replacement or cleaning, greatly simplifying maintenance operations and reducing downtime. Simultaneously, this design facilitates the replacement of screen meshes with different aperture sizes according to the fineness requirements of the target product, enhancing the equipment's process adaptability and flexibility. Preferably, the screen mesh can be fixed to the outer wall of the screen cylinder 3 using multiple rivets.

[0024] like Figures 1-4 As shown, the flange 31 of the feed inlet of the screen cylinder 3 is fitted into the circular hole 13 with an axial clearance.

[0025] In the above technical solution, flange 31 is placed inside the circular hole 13, so that the dynamic connection is surrounded by the shell of fine material bin 1. Dust that may escape from the flange connection will be confined within the internal cavity of fine material bin 1 and will not leak directly into the external environment. This improves the sealing performance of the equipment and helps to achieve clean production.

[0026] like Figure 4 As shown, the top two ends of the fine material bin 1 are vertically and symmetrically connected with suspension rods 61, and a brush roller 6 is rotatably connected between the two suspension rods 61, and the bottom of the brush roller 6 is in rolling contact with the screen at the top of the screen cylinder 3.

[0027] In the aforementioned technical solution, during the screening process of fly ash, some fine powder easily embeds or adheres to the screen mesh, causing screen blockage and thus reducing screening efficiency and output. This structure utilizes the rotation of the screen cylinder 3 itself, which drives the brush roller 6 to roll through friction. This rolling process allows the brush to continuously sweep and wash the screen surface, promptly removing particles that clog the mesh, thereby maintaining the screen's permeability and ensuring continuous, efficient, and stable screening operations.

[0028] like Figure 1 as well as Figures 3-7 As shown, the top of the fine material bin 1 has a radially open observation port, which is sealed by an observation door 12 that is adapted to it. The two ends of one long edge of the observation door 12 are respectively hinged to the outer wall of the fine material bin 1 by symmetrically arranged hinges 121, and a handle 122 is provided in the middle of the other long edge.

[0029] In the above technical solution, when maintenance operations such as screen replacement, repair, or brush roller replacement are required, the observation door 12 provides a direct and spacious maintenance entrance. Maintenance personnel can directly access vulnerable parts inside the equipment from here, simplifying the maintenance process, improving the efficiency of maintenance operations, and thus effectively shortening the downtime cycle due to maintenance and increasing the production utilization rate of the equipment.

[0030] like Figure 2 and Figure 4 As shown, the inner wall of the screen cylinder 3 is provided with multiple intermittent spiral blades (not shown in the figure) that are adapted to its rotation direction.

[0031] In the above technical solution, the spiral blades can increase the screening speed of materials in the screen cylinder 3. Example 2

[0032] Combination Figure 2 as well as Figures 4-7 As shown, based on the above embodiments, this embodiment further provides the following: In this embodiment, as Figures 4-6 As shown, the discharge port of the screen cylinder 3 is axially and detachably connected to a feed end pipe 32, and the feed end pipe 32 extends into the coarse material bin 2.

[0033] like Figure 2 and Figure 6 As shown, two annular protrusions 321 are integrally and axially spaced on the feed end tube 32, and the outer diameter of the annular protrusions 321 is larger than the inner diameter of the circular hole 14; wherein, the annular protrusions 321 located on the inner side are in close contact with the discharge end face of the fine material bin 1, and the annular protrusions 321 located on the outer side are flush with the edge of the discharge port of the feed end tube 32.

[0034] In the above technical solution, a feed pipe 32 is axially and detachably connected to the discharge port of the screen cylinder 3. The feed pipe 32 is provided with two annular protrusions 321. The annular protrusions 321 located on the inner side and the end face of the fine material bin 1 form a labyrinth-type sealing structure. This gap-fitted barrier can better prevent the fine dust floating in the fine material bin 1 from escaping to the coarse material bin 2 through the second round hole 14.

[0035] The design of the outer annular protrusion 321 being flush with the edge of the discharge port of the feed pipe 32 allows the coarse powder discharged from the end of the screen cylinder 3 to be better guided into the coarse material bin 2. This structure avoids material sticking at the edge of the pipe opening.

[0036] The feed inlet pipe 32 is axially and detachably connected to the screen cylinder 3. Preferably, the feed inlet pipe 32 is axially screwed to the discharge port end face of the screen cylinder 3 by at least two long screws; this makes it an independent consumable part. When it wears out due to long-term use, it can be easily replaced separately without replacing the entire screen cylinder, reducing maintenance costs and the difficulty of replacement.

[0037] like Figure 2 and Figure 7 As shown, a limiting component 5 is axially sleeved on the outside of the feed end tube 32; the limiting component 5 includes an annular pad 51, which is axially detachably attached to the discharge end face of the fine material bin 1, and the annular pad 51 is axially and gap-fitted with the annular protrusion 321 located inside the feed end tube 32; the outer ring surface of the annular pad 51 is axially and vertically connected to the limiting tube 52, and the outer opening of the limiting tube 52 is axially and detachably sealed with a retaining ring 53, and the retaining ring 53 is axially and gap-fitted with the annular protrusion 321 located outside the feed end tube 32; at least four limiting wheels 54 are circumferentially and rotatably connected between the annular pad 51 and the retaining ring 53, and the limiting wheels 54 are rollingly attached to the outer peripheral wall of the feed end tube 32.

[0038] In the above technical solution, the multiple circumferentially distributed limiting wheels 54 in the limiting component 5 provide effective radial constraint and support to the rotating feed end pipe 32 (i.e., the extension of the screen cylinder 3) from all sides. This can effectively suppress the radial runout and vibration at the end of the screen cylinder 3, ensuring the smoothness and reliability of the entire transmission system.

[0039] The use of a rolling friction limiting wheel 54 reduces rotational resistance, which is beneficial for energy saving and reduces wear on the support components themselves. At the same time, the inner annular protrusion 321 is axially fitted with the annular pad 51, which can further prevent dust from escaping from the second circular hole 14.

[0040] Preferably, the annular pad 51 is axially attached to the discharge end face of the fine material bin 1 by a matching bolt, while the retaining ring 53 is axially sealed to the outer opening of the limiting tube 52 by a matching screw. This detachable design facilitates the subsequent replacement and maintenance of the limiting wheel 54 inside the limiting tube 52, and also facilitates the replacement of the entire limiting assembly 5 and the feeding end tube 32.

[0041] like Figure 5 As shown, the outer end face of the coarse material bin 2 is axially and detachably equipped with a matching sealing plate 22.

[0042] In the above technical solution, when it is necessary to inspect or replace the feed end pipe 32 and the limiting component 5, only the sealing plate 22 needs to be removed to fully expose and access these components from the side of the equipment. This provides a convenient and direct operating window, enabling maintenance work to be carried out quickly and efficiently without the need for large-scale disassembly of the equipment, significantly shortening downtime for maintenance and improving the maintainability and operational efficiency of the equipment. Preferably, the sealing plate 22 is fixedly connected to the outer end face of the coarse material bin 2 by bolts.

[0043] Working principle and usage process of this utility model: In use, when the ball mill 7 is running, its overflow port 71 rotates accordingly, directly and passively transmitting the rotational power to the screen cylinder 3, which is axially connected to it, through the flange 31. This eliminates the need for an independent drive source for the screening equipment, as the screen cylinder 3 rotates synchronously with the ball mill 7.

[0044] The fly ash material, after being ground by the ball mill 7, enters the rotating screen cylinder 3 through the overflow port 71. Inside the screen cylinder 3, intermittent spiral blades continuously tumble and propel the material towards the discharge end. During this process, fine powder meeting the fineness requirements is thrown out through the screen mesh on the outer wall of the screen cylinder 3 under the action of centrifugal force and gravity. The thrown-out fine powder falls into the outer fine material bin 1 and collects at the bottom of the conical discharge hopper 11 under the action of gravity, awaiting collection as finished product.

[0045] Coarse powder that fails to pass through the screen continues to move along the screen cylinder 3 under the guidance of the spiral blades, and is eventually discharged into the coarse material hopper 2 through the feed end pipe 32 at its outlet. The annular protrusion 321 on the feed end pipe 32 works in conjunction with the limiting component 5 to ensure that the coarse powder is smoothly introduced into the coarse material hopper 2, while effectively preventing dust in the fine material hopper 1 from escaping into the coarse material hopper 2, and providing stable radial support for the rotating feed end pipe 32. The coarse powder that enters the coarse material hopper 2 then slides out through the chute 21 and is collected as another stage of product.

[0046] Throughout the screening process, the brush roller 6, supported by the suspension rod 61, maintains rolling contact with the top screen of the rotating screen cylinder 3, automatically and without power cleaning the screen surface, effectively preventing screen hole blockage and maintaining screening efficiency.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screening device based on the comprehensive utilization of fly ash, wherein the screening device is axially connected to the overflow port (71) of a ball mill (7), characterized in that: The screening equipment includes a hollow cylindrical fine material bin (1), which is horizontally fixed and supported by a matching support frame (4). The bottom of the fine material bin (1) is radially connected to a conical discharge hopper (11). The feed end and discharge end of the fine material bin (1) are respectively axially provided with a first round hole (13) and a second round hole (14). A hollow screen cylinder (3) is fitted through the axial gap between the first round hole (13) and the second round hole (14). The outer wall of the screen cylinder (3) is axially detachably fitted with a screen mesh. The feed inlet of the screen cylinder (3) is axially connected to the overflow port (71) of the ball mill (7) through a matching flange (31). The discharge end of the fine material bin (1) is axially integrated with a coarse material bin (2). The bottom of the coarse material bin (2) is radially connected to an inclined chute (21).

2. The screening equipment based on the comprehensive utilization of fly ash according to claim 1, characterized in that: The discharge port of the screen cylinder (3) is axially and detachably connected to a feed pipe (32), and the feed pipe (32) extends into the coarse material bin (2).

3. The screening equipment based on the comprehensive utilization of fly ash according to claim 2, characterized in that: The feed end tube (32) has two annular protrusions (321) axially integrated and spaced apart, and the outer diameter of the annular protrusions (321) is larger than the inner diameter of the second circular hole (14); wherein, the annular protrusions (321) located on the inner side are in close contact with the discharge end face of the fine material bin (1), and the annular protrusions (321) located on the outer side are flush with the edge of the discharge port of the feed end tube (32).

4. The screening equipment based on the comprehensive utilization of fly ash according to claim 2, characterized in that: The flange (31) of the feed inlet of the screen cylinder (3) is fitted into the circular hole (13) with an axial clearance.

5. The screening equipment based on the comprehensive utilization of fly ash according to claim 3, characterized in that: A limiting component (5) is axially sleeved on the outside of the feed end tube (32); the limiting component (5) includes an annular pad (51), which is axially detachably attached to the discharge end face of the fine material bin (1), and the annular pad (51) is axially and gap-fitted with the annular protrusion (321) located inside the feed end tube (32); the outer ring surface of the annular pad (51) is axially and vertically connected to a limiting tube (52), and the outer opening of the limiting tube (52) is axially and detachably sealed with a retaining ring (53), and the retaining ring (53) is axially and gap-fitted with the annular protrusion (321) located outside the feed end tube (32); at least four limiting wheels (54) are circumferentially and rotatably connected between the annular pad (51) and the retaining ring (53), and the limiting wheels (54) are rollingly attached to the outer peripheral wall of the feed end tube (32).

6. The screening equipment based on the comprehensive utilization of fly ash according to claim 2, characterized in that: The outer end face of the coarse material bin (2) is axially and detachably fitted with a sealing plate (22).

7. The screening equipment based on the comprehensive utilization of fly ash according to claim 1, characterized in that: The fine material bin (1) is vertically and symmetrically connected to two ends of the top, and a brush roller (6) is rotatably connected between the two suspension rods (61), and the bottom of the brush roller (6) is in rolling contact with the screen at the top of the screen cylinder (3).

8. The screening equipment based on the comprehensive utilization of fly ash according to claim 1, characterized in that: The fine material bin (1) has an observation port radially opened at the top. The observation port is sealed by an observation door (12) that is adapted to it. The two ends of one long edge of the observation door (12) are respectively hinged to the outer wall of the fine material bin (1) by symmetrically arranged hinges (121), and a handle (122) is provided in the middle of the other long edge.

9. The screening equipment based on the comprehensive utilization of fly ash according to claim 1, characterized in that: The inner wall of the sieve cylinder (3) is provided with multiple intermittent spiral blades adapted to its rotation direction.

Images