A heavy media coal preparation arc screen feeding device

Abstract

This utility model discloses a heavy media coal preparation arc screen material distribution device. The technical solution is as follows: it includes a feed pipe, and a material distribution box is connected to the end of the feed pipe. A baffle plate is movably placed in the center of the bottom of the material distribution box. A buffer zone is formed between the baffle plate and the material distribution box. The material in the buffer zone falls evenly from multiple drop pipes set on the side through the baffle plate. This utility model effectively solves the problems of uneven material distribution and insufficient wear resistance through the buffer zone formed by the baffle plate and the material distribution box and the design of wear-resistant components. It has the advantages of uniform material distribution, excellent wear resistance and low maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of heavy medium coal preparation arc screens, specifically to a heavy medium coal preparation arc screen material distribution device. Background Technology

[0002] In heavy media coal preparation systems, the arc screen plays a crucial role in dewatering, desliming, and media removal. Through its unique arc-shaped screen surface structure and the centrifugal force generated by material movement, it effectively separates solid-liquid mixtures, significantly improving the separation efficiency of coal slime and the medium. However, in actual production, due to the continuously increasing amount of raw coal being processed, existing arc screen feeding devices generally suffer from uneven material distribution. This uneven distribution directly leads to excessive impact on local areas of the screen plate, causing abnormal wear and resulting in high equipment maintenance costs. More seriously, uneven material distribution also reduces the efficiency of medium recovery, causing medium loss to consistently fail to meet industry standards, directly impacting the economic benefits of the coal preparation system. Furthermore, the unreasonable design of the buffer structure in traditional feeding devices and insufficient wear resistance further exacerbate equipment wear. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a heavy media coal preparation arc screen material distribution device.

[0004] This utility model is achieved through the following technical solution:

[0005] This application provides a heavy media coal preparation arc screen material distribution device, the technical solution of which is as follows: it includes a feed pipe, the end of which is connected to a material distribution box, a baffle plate is movably placed in the center of the bottom of the material distribution box, a buffer zone is formed between the baffle plate and the material distribution box, and the material in the buffer zone falls evenly from multiple drop pipes set on the side through the baffle plate.

[0006] Furthermore, this application also proposes that the cross-section of the baffle plate is triangular, and its long hypotenuse extends toward the middle of the discharge port at the top of the discharge pipe.

[0007] Furthermore, this application also proposes that a wear-resistant base plate is movably placed at the bottom of the buffer zone, and both the wear-resistant base plate and the baffle plate are made of wear-resistant cast stone plate.

[0008] Furthermore, this application also proposes that the bottom of the baffle plate has multiple limiting slots, and limiting strip blocks fixed to the bottom of the fabric box are engaged in the limiting slots.

[0009] Furthermore, this application also proposes that multiple material drop tubes are positioned away from the buffer zone and that their tops have corresponding material drop openings with the material box.

[0010] Furthermore, this application also proposes that the feed pipe outlet extends into the fabric box and is located above the buffer zone.

[0011] Furthermore, this application also proposes that the end flange of the fabric box is connected to a removable sealing cover.

[0012] Compared with existing technologies, the advantages of this utility model are: through the design of the buffer zone formed by the baffle plate and the fabric box and the wear-resistant components, this utility model effectively solves the problems of uneven fabric distribution and insufficient wear resistance, and has the advantages of uniform fabric distribution, excellent wear resistance and low maintenance cost. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 yes Figure 1 Enlarged view of a local structure in the diagram;

[0015] In the diagram: 1. Feed pipe; 2. Material box; 3. Exhaust port; 4. Material baffle plate; 5. Buffer zone; 6. Wear-resistant base plate; 7. Limiting strip block; 8. Limiting slot; 9. Drop pipe; 10. Drop outlet. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1 , 2 As shown, this application proposes a heavy media coal preparation arc screen material distribution device, including a feed pipe, a material distribution box connected to the end of the feed pipe, a baffle plate movably placed in the center of the bottom of the material distribution box, a buffer zone formed between the baffle plate and the material distribution box, and the material in the buffer zone falls evenly from multiple drop pipes set on the side through the baffle plate.

[0018] The feed pipe can be a circular pipe, with its outlet extending into the inside of the distribution box and located directly above the buffer zone to ensure that the material falls vertically into the buffer zone. The distribution box is preferably a welded steel structure, lined with wear-resistant material to extend its service life. A baffle plate is movably mounted at the bottom of the distribution box via a sliding mechanism, and its tilt angle can be adjusted within the range of 15-45 degrees. The buffer zone volume is designed to be 0.2-0.5 cubic meters depending on the throughput; the size of the buffer space can be changed by adjusting the position of the baffle plate. The number of feed pipes is typically set to 3-4, equidistantly arranged along the length of the distribution box, and the total cross-sectional area of ​​all feed pipes should be no less than 1.2 times the cross-sectional area of ​​the feed pipe.

[0019] This technical solution reduces and evenly distributes the high-velocity coal-medium mixture by incorporating a baffle plate and buffer structure. The material first impacts the wear-resistant bottom plate of the buffer zone, consuming kinetic energy, then forms a stable material layer within the buffer zone, and finally is evenly distributed through multiple drop pipes. Compared to direct impact feeding methods, this device reduces localized impact wear by more than 60%, extending screen life by 2-3 times. Uniform material distribution also ensures balanced load distribution on the arc screen's working surface, increasing media recovery rate by 5-8 percentage points. The adjustable design of the baffle plate can adapt to different coal qualities and flow rate variations, and the buffer volume can be flexibly adjusted according to on-site conditions. This device has a simple and reliable structure, is easy to maintain, and effectively solves the problem of screen wear caused by uneven material distribution in heavy media coal preparation systems.

[0020] Furthermore, this application also proposes that the cross-section of the baffle plate is triangular, and its long hypotenuse extends toward the middle of the discharge port at the top of the discharge pipe.

[0021] Specifically, the triangular cross-section design of the baffle plate makes the material flow more gently from the buffer zone towards its long, sloping side, with the long, sloping side extending directly towards the center of the discharge port. As a preferred embodiment, the apex angle of the triangular cross-section can be selected within the range of 30° to 60°, and the length of the long, sloping side is adjusted according to the width of the distribution box and the spacing of the discharge pipes. Furthermore, the surface of the long, sloping side can be processed into a wavy or serrated shape to further improve the material dispersion effect.

[0022] Therefore, this technical solution optimizes the geometry of the baffle plate, allowing material to be uniformly guided along the inclined side to each discharge pipe. The triangular cross-section design effectively reduces turbulence within the buffer zone, and the extended long inclined side ensures that material accurately enters the center of the discharge port. Compared to traditional flat baffle structures, this solution significantly improves material distribution uniformity, reduces impact wear on the screen plate, and minimizes media loss during the distribution process. In practical implementation, the installation angle of the baffle plate can be finely adjusted by regulating the engagement position of the limiting slot and the limiting strip block to adapt to the characteristics of different materials.

[0023] Furthermore, this application also proposes that a wear-resistant base plate is movably placed at the bottom of the buffer zone, and both the wear-resistant base plate and the baffle plate are made of wear-resistant cast stone plate.

[0024] The wear-resistant base plate is detachably connected to the bottom of the buffer zone via a movable placement method, specifically through a sliding rail installation. The wear-resistant cast stone plate is made of basalt material with a Rockwell hardness exceeding HRC58, exhibiting wear resistance 8-10 times that of ordinary steel plates. The contact surface between the baffle plate and the wear-resistant base plate is precision ground, with a flatness error controlled within 0.1mm. As a preferred embodiment, the wear-resistant base plate can be designed as a modular structure, composed of multiple pieces spliced ​​together for easy partial replacement. Furthermore, the surface of the wear-resistant cast stone plate can be coated with an anti-stick coating, such as a polytetrafluoroethylene coating, with a thickness of 0.05-0.1mm.

[0025] This technical solution effectively solves the problem of rapid wear caused by material impact in heavy media coal preparation of arc screens by using wear-resistant cast stone plates as the material for key components. The dual wear-resistant structure formed by the wear-resistant bottom plate and the baffle plate can withstand the long-term erosion of high-concentration media and coal slime. The movable installation design facilitates maintenance and replacement after wear, and the split structure reduces maintenance costs. Compared with existing technologies, this solution extends the service life of key components by 3-5 times while maintaining smooth material flow and avoiding uneven material distribution caused by component wear.

[0026] Furthermore, this application also proposes that the bottom of the baffle plate has multiple limiting slots, and limiting strip blocks fixed to the bottom of the material box are engaged in the limiting slots.

[0027] The limiting slot is a groove structure located at the bottom of the baffle plate, and its shape matches the limiting strip block. It can be rectangular, trapezoidal, or other geometric shapes. The limiting strip block is welded to the bottom of the material distribution box. As a preferred embodiment, the limiting slot and the limiting strip block are engaged in a snap-fit ​​manner to ensure that the baffle plate does not shift under material impact. Specifically, the depth of the limiting slot is 1 / 4 to 1 / 3 of the height of the limiting strip block, which ensures the positioning effect, facilitates installation and disassembly, and allows the buffer space size to be changed by adjusting the snap-fit ​​position of the baffle plate, thereby improving the adaptability of the buffer space to materials with different flow rates.

[0028] Therefore, through the cooperation of the limiting slot and the limiting strip, the baffle plate maintains a stable position when subjected to material impact, avoiding displacement or tilting caused by vibration. This structure effectively solves the problem of relative displacement between the wear-resistant base plate and the baffle plate caused by long-term wear, ensuring that the buffer zone always maintains the designed gap. Compared with the method of positioning by gravity alone, this mechanical limiting structure significantly improves the reliability of the device operation and extends the service life of the wear-resistant cast stone plate.

[0029] Furthermore, this application also proposes that multiple material drop pipes are set away from the buffer zone and that their tops have corresponding material drop openings with the material box.

[0030] The material discharge pipes are arranged at an angle of 15-45 degrees to the horizontal plane, with the specific angle adjustable according to the material characteristics. The discharge openings are rectangular or circular, with an opening size of 50-100mm. The material discharge pipes are fixed to the material distribution box by welding, and the pipe body can be made of wear-resistant alloy steel or a composite pipe structure lined with ceramic. The number of material discharge pipes is set to 2-4 depending on the processing capacity, evenly distributed along the length of the material distribution box.

[0031] Specifically, this technical solution involves placing the discharge pipe away from the buffer zone, ensuring that the material is adequately buffered before entering the discharge pipe. The corresponding arrangement of the discharge port and the discharge pipe guarantees uniform material distribution. This effectively solves the problem of localized wear on the screen plate caused by uneven material distribution in arc-shaped screens. Compared with existing technologies, this structural design makes material flow smoother, reduces turbulence, and extends the service life of the screen plate. The inclined arrangement of the discharge pipe allows material to fall naturally under gravity, preventing material accumulation and blockage. The selection of wear-resistant materials further improves the durability of the device.

[0032] Furthermore, this application also proposes that the feed pipe outlet extends into the fabric box and is located above the buffer zone.

[0033] This technical solution places the feed pipe outlet above the buffer zone, allowing material to fall directly into the buffer zone. The material first enters the buffer zone under gravity, and after being buffered and diverted by the long inclined flow-damping plate, it is then evenly distributed to each feed pipe. Compared to existing technologies where material directly impacts the screen plate, this effectively reduces the direct impact force on the screen plate, thus reducing screen plate wear. Specifically, the buffer zone effectively controls the material flow rate, preventing concentrated scouring of the screen plate by high-speed material flow, thereby extending the screen plate's service life.

[0034] Furthermore, this application also proposes that the end flange of the fabric box is connected to a removable sealing cover.

[0035] The sealing cover is fixed to the end of the material distribution box via a flange connection, solving the technical problem of difficult internal maintenance of the arc-shaped screen material distribution device. Specifically, the flange connection ensures sealing performance while facilitating quick disassembly; the detachable structure makes the inspection and maintenance of internal components such as the baffle plate and wear-resistant base plate more convenient, without requiring complete disassembly of the material distribution device. Compared with existing technologies, this solution significantly improves equipment maintenance efficiency, reduces downtime, and the sealing performance of the flange connection effectively prevents media leakage, helping to maintain stable material distribution pressure.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A heavy media coal preparation arc screen feeding device, comprising a feed pipe (1), characterized in that: The feed pipe (1) is connected to a material distribution box (2) at one end. A baffle plate (4) is movably placed at the center of the bottom of the material distribution box (2). A buffer zone (5) is formed between the baffle plate (4) and the material distribution box (2). The material in the buffer zone (5) falls evenly from multiple drop pipes (9) set on the side through the baffle plate (4).

2. The heavy media coal preparation arc screen feeding device according to claim 1, characterized in that: The material baffle (4) has a triangular cross-section and its long hypotenuse extends toward the middle of the material outlet (10) at the top of the material drop pipe (9).

3. The heavy media coal preparation arc screen feeding device according to claim 1, characterized in that: A wear-resistant base plate (6) is movably placed at the bottom of the buffer zone (5). Both the wear-resistant base plate (6) and the baffle plate (4) are made of wear-resistant cast stone.

4. The heavy media coal preparation arc screen feeding device according to claim 3, characterized in that: The bottom of the baffle plate (4) has multiple limiting slots (8), and the limiting slots (8) are fitted with limiting strip blocks (7) fixed to the bottom of the fabric box (2).

5. The heavy media coal preparation arc screen feeding device according to claim 2, characterized in that: Multiple material drop tubes (9) are positioned away from the buffer zone (5) and their tops have corresponding material drop ports (10) with the material box (2).

6. The heavy media coal preparation arc screen feeding device according to claim 1, characterized in that: The outlet of the feed pipe (1) extends into the fabric box (2) and is above the buffer zone (5).

7. The heavy media coal preparation arc screen feeding device according to claim 1, characterized in that: The end flange of the fabric box (2) is connected to a removable sealing cover.

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