A raw coal forced desliming double-layer chute device
By using a double-layer chute device for forced desliming of raw coal, and combining high-pressure air and spray water, the problem of insufficient pre-desliming of raw coal in existing coal preparation plants has been solved. This has enabled efficient separation and desliming of raw coal and fine coal, thereby improving production efficiency and economic benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI XINNENG COAL PREPARATION TECH CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-07
AI Technical Summary
Existing coal preparation plants lack a raw coal pre-desliming stage, resulting in -0.5mm particle size coal slime directly entering the heavy media washing system from the raw coal being washed. This leads to problems such as excessive coal slime in the combined media system, agglomeration in the shallow heavy media tank, increased viscosity of the media system, and decreased separation efficiency. Traditional desliming equipment has limited functionality and cannot meet the high-efficiency, energy-saving, and environmentally friendly production requirements of modern coal preparation plants.
A double-layer chute device for forced desliming of raw coal is adopted, which combines the dual effects of high-pressure air and spray water. The high-pressure air nozzle blows away the fine coal and the spray water nozzle washes away the coal slime. Combined with the knife-type cleaner to clean the residual coal slime, the raw coal and fine coal are separated and thoroughly washed.
It achieves efficient separation and desliming of raw coal and fine coal, reduces the burden on the heavy media washing system, improves production efficiency and economic benefits, and avoids screen blockage and water waste.
Smart Images
Figure CN224462895U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of desliming equipment technology, specifically to a double-layer chute device for forced desliming of raw coal. Background Technology
[0002] With the increasing mechanization and intelligence of coal mining, the content of fine coal and coal slime in raw coal has significantly increased, placing higher demands on the washing and beneficiation processes of coal preparation plants. Some existing coal preparation plants, due to the lack of a pre-desliming stage in their early process designs, allow -0.5mm particle size coal slime to directly enter the heavy media washing system. This leads to a series of problems, including excessive coal slime in the combined media system, agglomeration in the shallow heavy media trough, increased viscosity of the qualified media system, decreased separation efficiency of the heavy media cyclone separator, and a significant increase in media consumption. These issues severely impact the production efficiency and economic benefits of the coal preparation plant.
[0003] Traditional methods for desliming raw coal have many limitations. For example, mechanical screening alone is easily affected by the moisture content and particle size distribution of the raw coal, resulting in low desliming efficiency and easy clogging of the screen plates. While hydraulic washing can effectively remove some coal slime, it is not effective in separating fine coal from raw coal, easily leading to fine coal loss and water waste. In addition, existing desliming equipment is often single-function and cannot simultaneously achieve efficient separation of raw coal and fine coal as well as thorough washing of coal slime on the surface of the raw coal, making it difficult to meet the high-efficiency, energy-saving, and environmentally friendly production requirements of modern coal preparation plants.
[0004] Therefore, this device provides a double-layer chute for forced desliming of raw coal. Utility Model Content
[0005] The purpose of this utility model is to address the shortcomings of the existing technology by providing a double-layer chute device for forced desliming of raw coal, so as to solve the technical problems mentioned above.
[0006] This utility model embodiment adopts the following technical solution: it includes a conveyor for transporting raw coal materials and a double-layer chute device for handling raw coal materials. The front end of the double-layer chute device is equipped with a high-pressure air nozzle aligned with the conveying trajectory of the raw coal materials. The double-layer chute device has an upper bottom plate for conveying raw coal materials, and a desliming screen plate is located on the upper bottom plate. Above the desliming screen plate on the inner wall of the double-layer chute device, a spray nozzle for washing and desliming the raw coal materials is located. The device has a lower bottom plate for conveying fine coal and coal slurry. At the first end of the lower bottom plate, there is a flushing water nozzle for washing the fine coal and coal slurry. The first end of the upper bottom plate is spaced from the end of the conveyor to form a trough for fine coal to enter. Both the upper and lower bottom plates are inclined downwards. Inside the double-layer chute device, at the horizontal centerline of the conveyor end position, there is a knife-type cleaner for cleaning the residual fine coal on the conveyor. The knife-type cleaner is equipped with a compression spring.
[0007] In the process of raw coal desliming, the raw coal is conveyed to the double-layer chute device by a conveyor, where the raw coal material and the fine coal material can be separated and washed. At the same time, the raw coal material can also be washed and deslimed, achieving a good effect of raw coal desliming.
[0008] This device makes full use of wind and water power. When raw coal is transported to the double-layer chute device by the conveyor, the high-pressure air sprayed by the high-pressure air nozzles, which is perpendicular to the material movement curve, blows away the fine coal in the raw coal. The movement trajectory of the fine coal is changed by the impact. A gap is formed between the first end of the upper bottom plate and the end of the conveyor to facilitate the entry of the fine coal. It moves towards the lower bottom plate, while the movement trajectory of large pieces of raw coal is almost unaffected due to their large weight.
[0009] When large pieces of raw coal enter the lower bottom plate, they enter the desliming screen plate along the inclined angle of the lower bottom plate. At this time, the spray water nozzles are in the start state. Through the action of the spray water nozzles, the coal sludge adhering to the large pieces of raw coal is washed away. The washed coal sludge and water enter the lower bottom plate through the screen holes of the desliming screen plate.
[0010] Because coal slime and fine coal inevitably adhere to the surface of the conveyor during the conveying of raw coal materials, the knife-type sweeper can sweep off the coal slime and fine coal, which then flow down to the lower bottom plate. Low-pressure flushing water is then sprayed out through the flushing water nozzles to flush the coal slime and fine coal generated from these three parts together. The coal slime and fine coal then enter a separate coal slime water treatment system along the lower bottom plate, thereby achieving a good effect of raw coal desliming.
[0011] Furthermore, the spray nozzles are arranged horizontally and evenly in multiple quantities.
[0012] Furthermore, the flushing water nozzles are arranged horizontally and evenly in multiple positions, and the orientation angle of the multiple flushing water nozzles is consistent with the tilt angle of the lower base plate.
[0013] Furthermore, the air outlet of the high-pressure air nozzle is horizontal and its length is the same as the width of the conveyor.
[0014] Furthermore, the slit size on the desliming screen plate is between 3mm and 6mm.
[0015] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:
[0016] This invention fully utilizes the power of wind and water. When raw coal is transported to the double-layer chute device by the conveyor, the high-pressure air sprayed by the high-pressure air nozzle, perpendicular to the material movement curve, blows away the fine coal in the raw coal. The movement trajectory of the fine coal is changed due to the impact. A gap is formed between the first end of the upper bottom plate and the end of the conveyor to facilitate the entry of the fine coal, which moves towards the lower bottom plate. Meanwhile, the movement trajectory of large pieces of raw coal is almost unaffected due to their large weight.
[0017] When large pieces of raw coal enter the lower bottom plate, they enter the desliming screen plate along the inclined angle of the lower bottom plate. At this time, the spray water nozzles are in the start state. Through the action of the spray water nozzles, the coal sludge adhering to the large pieces of raw coal is washed away. The washed coal sludge and water enter the lower bottom plate through the screen holes of the desliming screen plate.
[0018] Because coal slime and fine coal inevitably adhere to the surface of the conveyor during the conveying of raw coal materials, the knife-type sweeper can sweep off the coal slime and fine coal, which then flow down to the lower bottom plate. Low-pressure flushing water is then sprayed out through the flushing water nozzles to flush the coal slime and fine coal generated from these three parts together. The coal slime and fine coal then enter a separate coal slime water treatment system along the lower bottom plate, thereby achieving a good effect of raw coal desliming. Attached Figure Description
[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0021] Figure 2 This is a cross-sectional structural diagram of the double-layer chute device in this utility model;
[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;
[0023] Figure 4 This is a cross-sectional schematic diagram of the internal structure of the double-layer chute device in this utility model.
[0024] Figure Labels
[0025] 1. Conveyor; 2. Double-layer chute device; 3. High-pressure air nozzle; 4. Upper bottom plate; 5. Chute opening; 6. Desliming screen plate; 7. Spray water nozzle; 8. Lower bottom plate; 9. Rinse water nozzle; 10. Knife cleaner. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0027] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0028] This utility model embodiment provides a double-layer chute device for forced desliming of raw coal, including a conveyor 1 for transporting raw coal and a double-layer chute device 2 for processing the raw coal. The front end of the double-layer chute device 2 is equipped with a high-pressure air nozzle 3 aligned with the conveying trajectory of the raw coal. The double-layer chute device 2 has an upper bottom plate 4 for conveying the raw coal, and a desliming screen plate 5 is located in the middle of the upper bottom plate 4. Above the desliming screen plate 5 on the inner wall of the double-layer chute device 2, a spray water nozzle 6 is provided for washing and desliming the raw coal. The chute device 2 is equipped with a lower bottom plate 7 for conveying fine coal and coal slurry. At the first end of the lower bottom plate 7, there is a flushing water nozzle 8 for washing the fine coal and coal slurry. The upper bottom plate 4 is spaced from the end of the conveyor 1 to form a slot 41 for the fine coal to enter. Both the upper bottom plate 4 and the lower bottom plate 7 are inclined downwards. Inside the double-layer chute device 2, at the horizontal centerline of the conveying position at the end of the conveyor 1, there is a knife-type cleaner 9 for cleaning the residual fine coal on the conveyor 1. The knife-type cleaner 9 is equipped with a compression spring.
[0029] In the process of raw coal desliming, the raw coal is conveyed to the double-layer chute device 2 by the conveyor 1, where the raw coal material and the fine coal material can be separated and washed. At the same time, the raw coal material can also be washed and deslimed, achieving a good effect of raw coal desliming.
[0030] A compression spring is installed on the support structure of the blade sweeper 9 at the connection point between the sweeping blade and the support. One end of the spring is fixed to the mounting base of the support, and the other end is connected to the back of the sweeping blade. When the conveyor 1 is running, the friction of the belt surface exerts a force on the sweeping blade, while the compression spring provides a counter-tension force, keeping the sweeping blade in close contact with the belt surface. As the sweeping blade gradually wears down during long-term use, the gap between the blade and the belt increases. At this time, the spring will automatically extend, generating a greater tension force through its own elastic deformation, pushing the sweeping blade forward to compensate for the gap caused by blade wear, maintaining close contact with the belt, and thus ensuring the cleaning effect.
[0031] This device makes full use of wind and water power. When raw coal is transported to the double-layer chute device 2 by conveyor 1, the high-pressure air sprayed by high-pressure air nozzle 3, which is perpendicular to the material movement curve, blows away the fine coal in the raw coal. The movement trajectory of the fine coal is changed due to the impact. A slot 41 is formed between the upper bottom plate 4 and the end of the conveyor 1 to facilitate the entry of fine coal. The coal moves towards the lower bottom plate 7. Large pieces of raw coal are almost unaffected by their own weight.
[0032] When large pieces of raw coal enter the lower bottom plate 7, they enter the desliming screen plate 5 along the inclined angle of the lower bottom plate 7. At this time, the spray water nozzle 6 is in the start state. Through the action of the spray water nozzle 6, the coal sludge adhering to the large pieces of raw coal is washed away. The washed coal sludge and water enter the lower bottom plate 7 through the screen holes of the desliming screen plate 5.
[0033] Since coal slime and fine coal inevitably adhere to the surface of the conveyor 1 during the conveying of raw coal materials, the knife-type cleaner 9 can sweep off the coal slime and fine coal and let them fall into the lower bottom plate 7 by gravity. Then, the flushing water nozzle 8 sprays low-pressure flushing water to wash the coal slime and fine coal generated from these three parts together, and they enter the separate coal slime water treatment system along the lower bottom plate 7, thereby achieving a good effect of raw coal desliming.
[0034] In a further preferred embodiment of the present invention, the spray nozzles 6 are arranged horizontally and evenly in multiple forms;
[0035] Multiple spray nozzles 6 are arranged horizontally and evenly to ensure uniform washing of the raw coal material, thereby improving the washing effect and desliming quality of the raw coal and achieving a good desliming effect. At the same time, during the desliming process, coal sludge may block the screen gaps on the desliming screen plate 5. However, the washing method avoids this problem. The coal sludge blocking the screen gaps on the desliming screen plate 5 will fall off due to the impact force of the washing.
[0036] To ensure that the multiple horizontally arranged spray nozzles 6 can uniformly and effectively wash the raw coal, a centralized water supply system can be adopted. A dedicated water supply pump house is set up within the coal preparation plant area, equipped with multi-stage centrifugal pumps. By adjusting the speed of the centrifugal pumps or configuring a frequency converter control system, the water pressure is stably controlled within a suitable range (generally 0.3-0.5 MPa) to meet the needs of the nozzles in washing the raw coal under different operating conditions. At the same time, pressure sensors and flow controllers are installed in the water supply pipeline to monitor and report water pressure and flow data in real time. The operating parameters of the centrifugal pumps are automatically adjusted according to the actual operating conditions to ensure that each nozzle receives a stable and uniform water volume.
[0037] In a further preferred embodiment of the present invention, the flushing water nozzles 8 are arranged horizontally and evenly in multiple positions, and the orientation angle of the multiple flushing water nozzles 8 is consistent with the tilt angle of the lower bottom plate 7.
[0038] The flushing water nozzles 8 are arranged horizontally and evenly, and the orientation angle of the multiple flushing water nozzles 8 is consistent with the tilt angle of the lower bottom plate 7. This ensures that the multiple flushing water nozzles 8 can flush the fine coal and coal slime evenly during the flushing process, thereby preventing the fine coal and coal slime from adhering to the lower bottom plate 7 after drying and hardening, which would make it difficult to leave residues later, and also improving the flushing effect.
[0039] Considering that the flushing water nozzles 8 need to evenly flush the fine coal and coal slime to prevent them from drying and hardening and adhering to the lower floor 7, the water supply method can adopt a combination of zoned water supply and localized pressurization. The lower floor 7 is divided into several water supply zones along its length, and each zone is equipped with an independent water supply branch pipe. A small booster pump is installed at the front end of each branch pipe. By adjusting the pressure of the booster pump, the flushing water nozzles 8 in each zone can obtain water flow pressure and flow rate that match the inclination angle of the lower floor 7, ensuring that the flushing direction is consistent with the material flow direction and achieving efficient flushing.
[0040] In a further preferred embodiment of this utility model, the air outlet of the high-pressure air nozzle 3 is horizontal and its length is the same as the width of the conveyor 1.
[0041] The high-pressure air nozzle 3 has a horizontal air outlet with the same length as the width of the conveyor 1. After the raw coal is conveyed by the conveyor 1 to the inside of the double-layer chute device 2, the high-pressure air sprayed by the high-pressure air nozzle 3 will blow the fine coal into the lower bottom plate 7, which avoids the fine coal conveyed on the conveyor 1 not being blown in, and greatly improves the effect of fine coal entering the lower bottom plate 7.
[0042] In a further preferred embodiment of this utility model, the screen slot size on the desliming screen plate 5 is between 3mm and 6mm;
[0043] With the screen gap size on the desliming screen plate 5 between 3mm and 6mm, the separation of raw coal slime can be effectively facilitated.
[0044] The above description is merely an embodiment of this utility model and is 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, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A double-layer chute device for forced desliming of raw coal, characterized in that: include; Conveyor used for transporting raw coal materials (1); (2) A double-layer chute device for handling raw coal materials; The double-layer chute device (2) is equipped with a high-pressure air nozzle (3) that is aligned with the raw coal material conveying trajectory inside the front end; The double-layer chute device (2) is provided with an upper bottom plate (4) for conveying raw coal materials, and a desliming screen plate (5) is provided in the middle of the upper bottom plate (4); The inner wall of the double-layer chute device (2) is equipped with a spray nozzle (6) for washing and desliming raw coal materials, which is located directly above the desliming screen plate (5). The double-layer chute device (2) is equipped with a lower bottom plate (7) for conveying fine coal and coal slurry. The lower bottom plate (7) is provided with a flushing water nozzle (8) at the first end to flush the fine coal and coal slurry; The upper bottom plate (4) has a gap between the first end and the end of the conveyor (1) to form a trough (41) for easy entry of fine coal. The upper bottom plate (4) and the lower bottom plate (7) are both inclined downwards. The double-layer chute device (2) is equipped with a knife cleaner (9) at the horizontal center line of the conveying position at the end of the conveyor (1) for cleaning the residual fine coal on the conveyor (1). The knife cleaner (9) is equipped with a compression spring.
2. The forced desliming double-layer chute device for raw coal as described in claim 1, characterized in that: The spray nozzles (6) are arranged horizontally and evenly in multiples.
3. The forced desliming double-layer chute device for raw coal as described in claim 1, characterized in that: The flushing water nozzles (8) are arranged horizontally and evenly in multiples, and the orientation angle of the multiple flushing water nozzles (8) is consistent with the tilt angle of the lower base plate (7).
4. The double-layer chute device for forced desliming of raw coal as described in claim 1, characterized in that: The air outlet of the high-pressure air nozzle (3) is horizontal and its length is the same as the width of the conveyor (1).
5. The forced desliming double-layer chute device for raw coal as described in claim 1, characterized in that: The screen slot size on the desliming screen plate (5) is between 3mm and 6mm.