A large particle material screening and recycling system for a mill

Abstract

This utility model belongs to the field of material separation and recovery technology, and relates to a mill large particle material screening and recovery system. It includes a mill body, an inclined screening unit, a sedimentation tank, a feed pump, and a coal feeding unit, connected sequentially along the material flow direction. The inclined screening unit is inclined and used to screen impurities in large particles. The inclined screening unit includes a fixed part and an inclined part integrally formed with the fixed part. Multiple screening grids are sequentially arranged on the inclined part along the material flow direction. The mill body is connected to the sedimentation tank sequentially through the fixed part and the multiple screening grids. This utility model can effectively remove impurities, ensure the normal and stable operation of the crushing device, and avoid losses caused by shutdown and maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of material separation and recycling technology, and relates to a screening and recycling system for large particles of materials in a mill. Background Technology

[0002] In the coal gasification process, the mill screens out a large amount of large particles, which are then collected and recycled to the coal preparation stage before finally entering the crushing unit in the coal feeding unit for subsequent processes. In actual production, since there are multiple mills, each producing 12 tons / day, a transfer trolley is used to collect the large particles back to the coal preparation stage. However, the following problems exist:

[0003] (1) Large particles contain impurities such as broken steel balls and steel bars. When these impurities enter the crushing device of the coal feeding unit along with the large particles, they get stuck in the crushing device, which leads to frequent tripping failures. This causes the crushing device to be unable to operate normally and stably, requiring shutdown for maintenance, increasing maintenance costs, and causing production losses.

[0004] (2) Water will be sprayed into the mill during use, so the large particles will be mixed with fine slurry and sewage. The use of a transfer trolley for transportation can easily cause leakage of fine slurry and sewage, which not only seriously pollutes the work site, but also makes it difficult to clean the fine slurry, causing inconvenience to the site cleaning operation. Utility Model Content

[0005] In response to the technical problem that impurities such as crushed steel balls and steel bars mixed in during existing large particle material operations cause the crushing device to malfunction and operate stably, requiring shutdown and maintenance, this utility model provides a large particle material screening and recovery system for mills.

[0006] In this invention, a mill body, an inclined screening unit, a sedimentation tank, a feed pump, and a coal feeding unit are sequentially connected along the material flow direction. The inclined screening unit is inclined and used to screen impurities in large particles. In the recovery of large particles, impurities are first screened by the inclined screening unit to prevent them from entering the crushing device. Then, the fine slurry is settled in the sedimentation tank, and finally, the large particles are transported to the coal feeding unit by the feed pump. This invention can effectively remove impurities, ensure the normal and stable operation of the crushing device, and avoid losses caused by shutdown and maintenance.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A mill large particle material screening and recovery system includes a mill body, an inclined screening unit, a sedimentation tank, a feed pump and a coal feeding unit connected in sequence along the material flow direction; the inclined screening unit is inclined and used to screen impurities in large particle materials.

[0009] Further defined, the inclined screening unit includes a fixed part and an inclined part integral with the fixed part; multiple screening grids are sequentially arranged on the inclined part along the flow direction of the material; the mill body is connected to the sedimentation tank sequentially through the fixed part and the multiple screening grids.

[0010] Furthermore, the screen aperture size of the plurality of screening grids gradually decreases along the material flow direction.

[0011] Furthermore, the inclined screening unit also includes a mechanical gripper disposed around the inclined portion.

[0012] Furthermore, the inclined screening unit also includes a support column disposed below the inclined portion; the support column is used to support the inclined portion.

[0013] Further specified, the sedimentation tank is provided with a cover plate; the cover plate is a grid structure; the inclined screening unit is connected to the interior of the sedimentation tank through the cover plate.

[0014] Furthermore, the mill large particle material screening and recovery system also includes a buffer tank located between the feed pump and the coal feeding unit.

[0015] Furthermore, the mill large particle material screening and recovery system also includes a collection tank connected to the sedimentation tank.

[0016] Furthermore, a fine slurry pump is installed between the sedimentation tank and the collection tank.

[0017] Furthermore, the mill large particle material screening and recovery system also includes a water pump connected to the sedimentation tank.

[0018] Compared with the prior art, the technical effects of this utility model are:

[0019] 1. In this utility model, a mill body, an inclined screening unit, a sedimentation tank, a feed pump, and a coal feeding unit are sequentially connected along the material flow direction. The inclined screening unit is inclined and used to screen impurities in large particles. In the recovery of large particles, impurities in large particles are first screened by the inclined screening unit to prevent them from entering the crushing device. Then, the fine slurry is settled in the sedimentation tank, and finally, the large particles are transported to the coal feeding unit by the feed pump. This utility model can effectively remove impurities, ensure the normal and stable operation of the crushing device, and avoid losses caused by shutdown and maintenance.

[0020] 2. This utility model's inclined screening unit includes a fixed part and an inclined part integrally formed with the fixed part; multiple screening grids are sequentially arranged on the inclined part along the material flow direction; the mill body is connected to the sedimentation tank sequentially through the fixed part and the multiple screening grids; and the screen aperture size of the multiple screening grids gradually decreases along the material flow direction. Multi-stage screening of impurities is achieved through multiple screening grids, enabling effective screening of impurities of different sizes, improving screening efficiency and effect. Furthermore, mechanical grippers on the periphery of the inclined part promptly remove trapped steel balls, steel rods, and other impurities from the screening grids within the inclined part, preventing grid blockage and ensuring a smooth screening process.

[0021] 3. The inclined part of this utility model is an inclined chute. In this case, the inclined part is used to replace the existing material transfer trolley for conveying. This not only avoids the leakage and fall of fine slurry and sewage onto the work site, thus maintaining the work site environment, but also solves the problem that fine slurry is difficult to clean up, which brings inconvenience to the site cleaning operation. At the same time, it also reduces the high transportation costs generated by the material transfer trolley, saving costs.

[0022] 4. This utility model provides a cover plate on the sedimentation tank; and the cover plate is a grid structure; in this way, when the inclined screening unit is connected to the inside of the sedimentation tank through the cover plate, screening can be further realized, enhancing screening efficiency; at the same time, it is convenient to observe the working condition inside the sedimentation tank, avoid overflow and other situations, and make the entire system operate more stably.

[0023] 5. This utility model sets up a buffer tank between the conveying pump and the coal feeding unit to buffer the recovered large particles, avoid a large amount of large particles from clogging the coal feeding unit, and ensure the stability of the process between screening and subsequent coal feeding units.

[0024] 6. This utility model, by setting up a collection tank, a fine slurry pump, and a water pump, on the one hand, uses the water pump to remove the sewage from the top of the sedimentation tank; on the other hand, it transports the fine slurry settled at the bottom of the sedimentation tank out, avoiding the accumulation of sediment, so that the sedimentation tank can work continuously and stably, improving the separation of large particles from fine slurry, and improving the recovery efficiency of large particles. Attached Figure Description

[0025] Figure 1 This utility model provides a screening and recovery system for large particles of materials in a mill.

[0026] Figure 2 This is a schematic diagram of an inclined screening unit;

[0027] in:

[0028] 10—Mill body; 20—Discharge pipe; 30—Inclined screening unit; 301—Fixed part; 302—Inclined part; 303—Large particle material inlet; 304—First screening grid; 305—Second screening grid; 306—Third screening grid; 307—Support column; 308—Cherry chute; 40—Sedimentation tank; 401—Cover plate; 50—Feed pump; 60—Buffer tank; 70—Coal feeding unit; 80—Fine slurry pump; 90—Collection tank; 100—Water pump. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0032] See Figure 1 In one embodiment of this utility model, a mill large particle material screening and recovery system includes a mill body 10, an inclined screening unit 30, a sedimentation tank 40, a feed pump 50 and a coal feeding unit 70 connected sequentially along the material flow direction; the inclined screening unit 30 is inclined and is used to screen impurities in large particle materials.

[0033] In this embodiment, the mill body 10 is a ball mill, which is used to grind lump coal into large particles with a particle size of less than 10mm. At the same time, according to the prior art, due to the addition of an appropriate amount of water in the ball mill and the use of steel balls for ball milling, the large particles contain sewage and fine slurry, as well as impurities such as broken steel balls and steel rods.

[0034] See Figure 2The inclined screening unit 30 includes a fixed part 301 and an inclined part 302 integrally formed with the fixed part 301. Preferably, the fixed part 301 has a cuboid structure, and a slide 308 is provided in the middle of the fixed part 301, which is connected to the inner wall of the fixed part 301. The inclined part 302 is connected to one of the side walls of the fixed part 301 and forms an integral part. At this time, the slide 308 is connected to the inclined part 302, and the inclination direction of the slide 308 is consistent with the inclination direction and inclination angle of the inclined part 302.

[0035] Preferably, the top of the fixed part 301 is provided with a large particle material inlet 303, and the lower side of the mill body 10 is connected to a discharge pipe 20. The discharge pipe 20 is inclined downward and extends above the large particle material inlet 303, so that the large particle material discharged from the mill body 10 falls into the fixed part 301, and then flows through the chute 308 to the inclined part 302 for screening.

[0036] Preferably, the inclined section 302 is an inclined chute. Baffles are designed on both sides of the inclined chute to prevent large particles of material entering the inclined section 302 from falling into the work site, and to prevent leakage of fine slurry and sewage, thus maintaining the work site environment. Moreover, there is no need to clean the fine slurry, which solves the problem of inconvenience caused by the falling fine slurry to the site cleaning operation.

[0037] In this embodiment, the inclination angle of the inclined portion 302 is 20° to 50°, ensuring that large particles, impurities, fine slurry, and wastewater can smoothly flow from the inclined portion 302 into the sedimentation tank 40. For example, the inclination angle of the inclined portion 302 is 20°, 25°, 30°, 35°, 40°, 45°, or 50°. Preferably, the inclination angle of the inclined portion 302 is 45° or 50°, at which point the downward flow performance of large particles containing impurities, fine slurry, and wastewater within the inclined portion 302 is optimal, improving screening efficiency.

[0038] In this embodiment, multiple screening grids are sequentially arranged on the inclined part 302 along the material flow direction; the mill body 10 is connected to the sedimentation tank 40 via the fixed part 301 and the multiple screening grids. The screen aperture size of the multiple screening grids gradually decreases along the material flow direction. Since impurities include broken steel balls and steel rods, multi-stage screening can be achieved through multiple screening grids, allowing impurities of different sizes to be effectively screened, thereby improving screening efficiency and screening effect.

[0039] In practice, there are two, three or more screening grids. The design can be customized according to the specific particle size of the impurities (crushed steel balls and steel rods) and the screening efficiency. However, this design is not within the scope of protection of this utility model and will not be described in detail here.

[0040] The following explanation uses the example of setting up three screening grids.

[0041] See Figure 2 Preferably, the screening grid includes a first screening grid 304, a second screening grid 305 and a third screening grid 306 arranged sequentially along the material flow direction; wherein the first screening grid 304 and the second screening grid 305 are installed inside the inclined portion 302, and the third screening grid 306 is installed on the end of the inclined portion 302 near the sedimentation tank 40.

[0042] Preferably, the first screening grid 304, the second screening grid 305, and the third screening grid 306 are all welded from steel columns or steel bars. Because the steel columns or bars have rigidity, they can resist the impact of rigid impurities such as broken steel balls and steel rods on the screening grid, preventing damage to the screening grid. In practice, the spacing between adjacent steel columns of the first screening grid 304, the spacing between adjacent steel columns of the second screening grid 305, and the spacing between adjacent steel columns of the third screening grid 306 decreases sequentially. During use, the first screening grid 304, the second screening grid 305, and the third screening grid 306 efficiently trap impurities such as broken steel balls and steel rods on the screening grid, allowing fine slurry and wastewater to fall into the sedimentation tank 40.

[0043] In this invention, to prevent trapped steel balls and steel rods from clogging the corresponding screening grids, the inclined screening unit 30 also includes mechanical grippers disposed around the inclined portion 302. The mechanical grippers promptly remove trapped steel balls, steel rods, and other impurities from the inclined portion 302, ensuring a smooth screening process. In practice, the mechanical grippers are commercially available products, and their installation position is determined based on the space around the inclined portion 302, but it is necessary to ensure that the extended end of the mechanical gripper can reach each screening grid. The mechanical grippers can be installed by welding, bolting, or other conventional connection methods in the art. The operation of the mechanical grippers can be manually controlled or automatically controlled; both control methods are conventional prior art and will not be described in detail here.

[0044] See Figure 1 The inclined screening unit 30 of this utility model also includes a support column 307 disposed below the inclined part 302; the support column 307 is used to support the inclined part 302.

[0045] See Figure 1This invention features a cover plate 401 on the sedimentation tank 40, through which the inclined screening unit 30 communicates with the interior of the sedimentation tank 40. In use, the cover plate 401 is designed as a grid structure, allowing for further screening when the inclined screening unit 30 communicates with the interior of the sedimentation tank 40, thus enhancing screening efficiency. Simultaneously, the cover plate improves safety and facilitates observation of the sedimentation tank 40's operation, preventing overflow and ensuring more stable system operation. Preferably, the feed pump 50 is connected to the middle of the sedimentation tank 40.

[0046] See Figure 1 In one embodiment of this invention, the large particle material screening and recovery system for a mill further includes a buffer tank 60 disposed between the feed pump 50 and the coal feeding unit 70. By setting up the buffer tank 60, the storage of recovered large particle materials is buffered, preventing a large amount of large particle materials from entering the subsequent coal feeding unit 70 and causing congestion in the coal feeding unit 70, thus ensuring the stability of the screening process and the subsequent coal feeding unit processes.

[0047] See Figure 1 In one embodiment of this invention, the mill large particle material screening and recovery system further includes a collection tank 90 connected to a sedimentation tank 40. A fine slurry pump 80 is installed between the sedimentation tank 40 and the collection tank 90. ​​Preferably, the fine slurry pump 80 is connected to the lower part of the sedimentation tank 40. The fine slurry settled at the bottom of the sedimentation tank 40 is periodically transported out by the fine slurry pump 80 and then stored in the collection tank 90, preventing the continuous accumulation of sediment in the sedimentation tank 40, enabling the sedimentation tank 40 to operate continuously and stably, and improving the recovery efficiency of large particles.

[0048] See Figure 1 In one embodiment of this invention, the mill large particle material screening and recovery system further includes a water pump 100 connected to the sedimentation tank 40. Preferably, the water pump 100 is connected to the upper part of the sedimentation tank 40. The water pump 100 periodically removes the wastewater from the top of the sedimentation tank 40, and then treats the wastewater uniformly to achieve water reuse; it also prevents water from overflowing from the sedimentation tank 40.

[0049] The mill large particle material screening and recovery system provided by this utility model, after on-site implementation, achieves efficient screening and separation of crushed steel balls, steel rods, and various impurities in large particles, effectively preventing impurities from entering the crushing device of the coal feeding unit, ensuring the normal and stable operation of the crushing device of the coal feeding unit, and avoiding losses caused by shutdown and maintenance. Furthermore, by optimizing the inclined part structure, it also effectively avoids pollution caused by the on-site environment, ensuring the cleanliness and safety of the working area. At the same time, after the implementation of this utility model, it replaces the high transportation costs generated by the existing material transfer trolley and reduces cost input.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A screening and recovery system for large particles in a mill, characterized in that, It includes a mill body (10), an inclined screening unit (30), a sedimentation tank (40), a feed pump (50) and a coal feeding unit (70) connected in sequence along the material flow direction; the inclined screening unit (30) is inclined and is used to screen impurities in large particles of material.

2. The mill large particle material screening and recovery system according to claim 1, characterized in that, The inclined screening unit (30) includes a fixed part (301) and an inclined part (302) integrally formed with the fixed part (301); a plurality of screening grids are arranged sequentially on the inclined part (302) along the flow direction of the material; the mill body (10) is connected to the sedimentation tank (40) sequentially through the fixed part (301) and the plurality of screening grids.

3. The mill large particle material screening and recovery system according to claim 2, characterized in that, The screen aperture size of the plurality of screen plates gradually decreases along the material flow direction.

4. The mill large particle material screening and recovery system according to claim 3, characterized in that, The inclined screening unit (30) also includes a mechanical gripper disposed around the inclined part (302).

5. The mill large particle material screening and recovery system according to claim 3, characterized in that, The inclined screening unit (30) further includes a support column (307) disposed below the inclined portion (302); the support column (307) is used to support the inclined portion (302).

6. The mill large particle material screening and recovery system according to claim 1, characterized in that, The sedimentation tank (40) is provided with a cover plate (401); the cover plate (401) is a grid structure; the inclined screening unit (30) is connected to the interior of the sedimentation tank (40) through the cover plate (401).

7. The mill large particle material screening and recovery system according to claim 1, characterized in that, The mill large particle material screening and recovery system also includes a buffer tank (60) set between the feed pump (50) and the coal feeding unit (70).

8. The mill large particle material screening and recovery system according to claim 7, characterized in that, The mill large particle material screening and recovery system also includes a collection tank (90) connected to the sedimentation tank (40).

9. The mill large particle material screening and recovery system according to claim 8, characterized in that, A fine slurry pump (80) is installed between the sedimentation tank (40) and the collection tank (90).

10. The mill large particle material screening and recovery system according to claim 8, characterized in that, The mill large particle material screening and recovery system also includes a water pump (100) connected to the sedimentation tank (40).

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