A coal screening device

Abstract

This application discloses a coal screening device, including a feed hopper, a washing box connected to the feed hopper, a washing mechanism for washing coal, and an air filtration mechanism for filtering air. The washing box contains a downwardly inclined screen plate, one side of which is connected to the inner wall of the washing box, and the other side extends downwards towards the outlet of the washing box. The washing mechanism includes a water pump, a nozzle, and a water supply pipe connected between the water pump and the nozzle. The nozzle is located inside the washing box and above the screen plate. The air filtration mechanism includes a filter box with an air cavity, a fan connected to the filter box for supplying air to the air cavity, a filter screen assembly located in the air cavity, and an air outlet pipe for discharging air from the air cavity. While the coal is treated with water mist for dust reduction inside the washing box, the air filtration mechanism also adsorbs coal dust from the environment, effectively reducing coal dust pollution during coal screening and improving the environmental friendliness of the screening process.

Description

Technical Field

[0001] This application relates to the field of coal technology, and in particular to a coal screening device. Background Technology

[0002] Coal is an important energy source and industrial raw material. The screening process is a key step in improving coal quality and realizing the graded utilization of resources. Traditional coal screening devices are prone to coal dust dispersion, forming a high-concentration dust environment. Current technologies generally use water mist to reduce the dust content in the air. However, water mist can only settle large dust particles and has low efficiency in removing ultrafine particles suspended in the air, which can easily cause secondary pollution. In addition, a large amount of coal dust is dispersed in the air in the screening environment, which is harmful to the health of operators. Summary of the Invention

[0003] The purpose of this application is to overcome the above-mentioned problems and provide a coal screening device.

[0004] The technical solution of this application provides a coal screening device, including a feeding hopper, a washing box connected to the feeding hopper, a washing mechanism for washing coal, and an air filtration mechanism for filtering air.

[0005] The cleaning tank is equipped with a downwardly inclined screen plate. One side of the screen plate is connected to the inner wall of the cleaning tank, and the other side of the screen plate is inclined downward and extends toward the discharge port of the cleaning tank.

[0006] The cleaning mechanism includes a water pump, a nozzle, and a water supply pipe connected between the water pump and the nozzle;

[0007] The nozzle is disposed inside the cleaning tank and above the sieve plate;

[0008] The air filtration mechanism includes a filter box with an air cavity, a fan, a filter screen assembly, and an air outlet duct;

[0009] The filter box is installed outside the cleaning box, the fan is connected to the filter box and is used to supply air into the air cavity, the filter screen assembly is disposed in the air cavity, and the air outlet pipe is connected to the filter box and is used to discharge the air in the air cavity.

[0010] Furthermore, the air filtration mechanism also includes a sedimentation filter box connected to the air outlet duct;

[0011] The sedimentation filter box includes a liquid chamber and at least one air outlet. The liquid chamber is filled with water, the end of the air outlet pipe is inserted into the liquid chamber, and the air outlet is located above the liquid chamber.

[0012] Furthermore, an air desiccant is provided at the air outlet.

[0013] Furthermore, the filter assembly includes a pre-filter and a medium-efficiency filter;

[0014] The primary filter is located on the side away from the air outlet duct, and the secondary filter is located on the side closer to the air outlet duct.

[0015] Furthermore, the cleaning mechanism includes a water tank disposed on the side wall of the cleaning tank;

[0016] The water tank is connected to the water pump.

[0017] Furthermore, the cleaning mechanism includes a water-containing cavity disposed on the side wall of the cleaning tank;

[0018] The water-containing chamber is connected to the water pump via the water supply pipe, and the nozzle is in communication with the water-containing chamber.

[0019] Furthermore, the feed hopper is provided with a baffle plate above the nozzle.

[0020] Furthermore, the washing box includes a temporary storage space for temporarily storing small coal particles;

[0021] The temporary storage space is located below the sieve plate.

[0022] Furthermore, the cleaning tank includes a water outlet pipe;

[0023] The water outlet pipe passes through the bottom of the side wall of the cleaning tank and is connected to the temporary storage space.

[0024] Furthermore, the temporary storage space has a door on its side wall, and the door is hinged to the cleaning box.

[0025] The above technical solution has the following beneficial effects:

[0026] The coal screening device of this application includes a feed hopper, a washing box connected to the feed hopper, a washing mechanism for washing coal, and an air filtration mechanism for filtering air. The washing box contains a downwardly inclined screen plate, one side of which is connected to the inner wall of the washing box, and the other side extends downwards towards the outlet of the washing box. The washing mechanism includes a water pump, a nozzle, and a water supply pipe connected between the water pump and the nozzle. The nozzle is located inside the washing box and above the screen plate. The air filtration mechanism includes a filter box with an air cavity, a fan connected to the filter box for supplying air to the air cavity, a filter screen assembly located in the air cavity, and an air outlet pipe for discharging air from the air cavity. While the coal is treated with water mist for dust reduction inside the washing box, the air filtration mechanism also adsorbs coal dust from the environment, effectively reducing coal dust pollution during coal screening and improving the environmental friendliness of the screening process. Attached Figure Description

[0027] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a coal screening device in one embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the filter box structure in one embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the sedimentation filter box filled with water in one embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the structure of a deposition filter box in one embodiment of this application;

[0032] Figure 5 This is a schematic diagram of the cleaning tank in one embodiment of this application.

[0033] Reference table for attached figures:

[0034] Feed hopper 1: Baffle plate 11;

[0035] Cleaning box 2: discharge port 21, temporary storage space 22, water outlet pipe 23, box door 24;

[0036] Cleaning mechanism 3: water pump 31, nozzle 32, water pipe 33, water tank 34, water chamber 35;

[0037] Air filtration mechanism 4: filter box 41, air cavity 411, fan 42, filter screen assembly 43, primary filter screen 431, medium-efficiency filter screen 432, air outlet duct 44, sedimentation filter box 45, liquid cavity 451, air outlet 46;

[0038] 5. Sieve plate. Detailed Implementation

[0039] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0040] It is readily understood that, based on the technical solution of this application, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this application. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this application and should not be considered as the entirety of this application or as limitations or restrictions on the technical solution of the application.

[0041] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meanings of the above in this application according to the specific circumstances.

[0043] like Figures 1-5 As shown, a coal screening device in one embodiment of this application includes a feed hopper 1, a washing box 2 connected to the feed hopper 1, a washing mechanism 3 for washing coal, and an air filtration mechanism 4 for filtering air.

[0044] The washing tank 2 is equipped with a downwardly inclined screen plate 5. One side of the screen plate 5 is connected to the inner wall of the washing tank 2, and the other side of the screen plate 5 is inclined downward and extends toward the discharge port 21 of the washing tank 2.

[0045] The cleaning mechanism 3 includes a water pump 31, a nozzle 32, and a water supply pipe 33 connected between the water pump 31 and the nozzle 32;

[0046] The nozzle 32 is disposed inside the cleaning tank 2 and located above the sieve plate 5;

[0047] The air filtration mechanism 4 includes a filter box 41 with an air cavity 411, a fan 42, a filter screen assembly 43, and an air outlet duct 44.

[0048] The filter box 41 is installed outside the cleaning box 2. The fan 42 is connected to the filter box 41 and is used to supply air into the air cavity 411. The filter screen assembly 43 is disposed in the air cavity 411. The air outlet duct 44 is connected to the filter box 41 and is used to discharge the air in the air cavity 411.

[0049] In this embodiment, the coal screening device includes a feed hopper 1, a washing box 2, a washing mechanism 3, and an air filtration mechanism 4, wherein the feed hopper 1 is connected to the washing box 2, the washing mechanism 3 is used to wash the coal, and the air filtration mechanism 4 is used to filter the air.

[0050] The washing tank 2 is equipped with a downwardly inclined screen plate 5. One side of the screen plate 5 is connected to the inner wall of the washing tank 2, and the other side is inclined downward and extends toward the discharge port 21 of the washing tank 2.

[0051] The cleaning mechanism 3 includes a water pump 31, a nozzle 32, and a water supply pipe 33. The nozzle 32 is located inside the cleaning box 2 and above the screen plate 5. The nozzle 32 is used to clean coal. One end of the water supply pipe 33 is connected to the nozzle 32, and the other end is connected to the water pump 31.

[0052] The air filtration mechanism 4 includes a filter box 41, a fan 42, a filter assembly 43, and an air outlet duct 44. The filter box 41 has an air cavity 411 and is installed outside the cleaning box 2. The fan 42 is connected to the filter box 41 and is used to supply air into the filter box 41. The filter assembly 43 is disposed in the air cavity 411 and is used to filter the air flowing through the inside of the filter box 41. The air outlet duct 44 is connected to the filter box 41 and is used to discharge the air inside the air cavity 411.

[0053] When coal begins to enter the feed hopper 1, it falls above the inclined screen plate 5. At this time, the water pump 31 starts to supply water to the water pipe 33. After receiving the water, the nozzle 32 starts to spray water onto the coal on the screen plate 5, which achieves water mist dust suppression and can also clean the coal. The coal rolls on the inclined screen plate 5. Large coal particles will be discharged from the discharge port 21 along the screen plate 5, while small coal particles will fall off the screen plate 5 and wait for further processing by technicians.

[0054] Some coal dust will escape into the external air of the coal screening device. At this time, the fan 42 of the air filtration mechanism 4 starts to form a negative pressure, draws in the polluted air, draws the polluted air into the air chamber 411, and flows through the filter assembly 43. The filter assembly 43 will filter the polluted air, and the filtered air can flow out from the air outlet duct 44, which significantly improves the air quality in the working environment.

[0055] The coal screening device in this embodiment, while achieving coal cleaning and screening, combines water mist and air filtration dual dust removal technologies to effectively prevent coal dust diffusion and improve the environmental performance of the coal screening device.

[0056] like Figures 1-4 As shown, in another preferred embodiment, the air filtration mechanism 4 further includes a deposition filter box 45 connected to the air outlet duct 44;

[0057] The sedimentation filter box 45 includes a liquid chamber 451 and at least one air outlet 46. The liquid chamber 451 is filled with water, the end of the air outlet duct 44 is inserted into the liquid chamber 451, and the air outlet 46 is located above the liquid chamber 451.

[0058] In this preferred embodiment, the air filtration mechanism 4 includes a sedimentation filter box 45, which is connected to an air outlet duct 44. The sedimentation filter box 45 includes a liquid chamber 451 and at least one air outlet 46. The liquid chamber 451 is filled with water. The end of the air outlet duct 44 is inserted into the liquid chamber 451, and the air outlet 46 is located above the liquid chamber 451.

[0059] After the polluted air passes through the filter assembly 43 in the filter box 41, it flows through the air outlet duct 44 and enters the liquid chamber 451 of the sedimentation filter box 45. The liquid chamber 451 is filled with water. As the coal dust and other particles pass through the water, they will settle due to the liquid resistance, thus performing secondary filtration on the fine coal dust that was not captured by the filter assembly 43. The purified air floats in the water and leaves from the air outlet 46, which significantly improves the dust removal efficiency and enhances the environmental friendliness of the device.

[0060] In one embodiment, the top cover of the sedimentation filter box 45 is openable and closable, allowing technicians to replace the water in the liquid chamber 451 by opening the top cover of the sedimentation filter box 45.

[0061] like Figure 1 As shown, in a preferred embodiment, at least two air filtration mechanisms 4 are respectively arranged on opposite sides of the coal screening device, wherein filter boxes 41 are respectively arranged on the side walls of the feed hopper 1, and sedimentation filter boxes 45 are respectively arranged on the side walls of the washing box 2.

[0062] In this preferred embodiment, an air filtration mechanism 4 is arranged on both sides of the coal screening device, which can simultaneously adsorb coal dust particles in the air from two directions, significantly improving the overall dust removal effect and optimizing the working environment.

[0063] In another preferred embodiment, an air desiccant is provided at the air outlet 46.

[0064] In this preferred embodiment, an air desiccant is provided at the air outlet 46 to further dry the exhaust gas after it has been treated by the sedimentation filter box 45. It can effectively adsorb the residual moisture in the air after it has been purified by the water, reduce the exhaust humidity, prevent the humid air from affecting the external environment, and the desiccant is low in cost, easy to replace, and has good economic efficiency. It improves the air purification capability of the coal screening device and enhances its environmental adaptability.

[0065] like Figure 2 As shown, in one preferred embodiment, the filter assembly 43 includes a primary filter 431 and a secondary filter 432.

[0066] The primary filter 431 is located on the side away from the air outlet duct 44, and the secondary filter 432 is located on the side closer to the air outlet duct 44.

[0067] In this preferred embodiment, the filter assembly 43 includes a primary filter 431 and a secondary filter 432. The primary filter 431 is located on the side away from the air outlet duct 44, and the secondary filter 432 is located on the side closer to the air outlet duct 44. After polluted air flows into the air chamber 411, it first passes through the primary filter 431, and then flows through the secondary filter 432 before finally flowing out of the filter box 41 from the air outlet duct 44. The primary filter 431 first intercepts larger coal dust particles, reducing their direct impact on the secondary filter 432. The secondary filter 432 further intercepts fine particles, thus purifying the coal dust in the air. The arrangement of the staged filtration makes the airflow smoother, reduces the clogging problem caused by one-time high-density filtration, and ensures the ventilation efficiency of the air in the filter box 41.

[0068] The primary filter 431 mainly intercepts large particulate pollutants larger than 5 micrometers, such as dust, hair, and fibers; the medium-efficiency filter 432 mainly filters medium-sized particles of 1-5 micrometers, such as coal dust and smoke.

[0069] like Figure 1 As shown, in one embodiment, the cleaning mechanism 3 includes a water tank 34 disposed on the side wall of the cleaning tank 2;

[0070] Water tank 34 is connected to water pump 31.

[0071] In this embodiment, the cleaning mechanism 3 includes a water tank 34, which is installed on the side wall of the cleaning tank 2 and connected to the water pump 31. It is used to provide a stable water supply to the water pump 31. The water tank 34 is installed on the side wall of the cleaning tank 2, which occupies little space and increases the adaptability of the device. In addition, the water tank 34 can be inspected, cleaned or replaced by technicians, which improves the convenience of system maintenance.

[0072] like Figure 1 , Figure 5 As shown, in another preferred embodiment, the cleaning mechanism 3 includes a water-containing cavity 35 disposed on the side wall of the cleaning tank 2;

[0073] The water-containing chamber 35 is connected to the water pump 31 through the water supply pipe 33, and the nozzle 32 is connected to the water-containing chamber 35.

[0074] In this preferred embodiment, the cleaning mechanism 3 includes a water-containing chamber 35, which is located on the side wall of the cleaning tank 2 and close to the nozzle 32. This shortens the length of the end water path, reduces energy consumption, and improves the overall water supply efficiency. One end of the water supply pipe 33 is connected to the water pump 31, and the other end is connected to the water-containing chamber 35. The nozzle 32 is connected to the water-containing chamber 35. The water pump 31 is connected to the water tank 34. When the cleaning mechanism 3 is started, the water pump 31 draws water from the water tank 34 and then delivers the water from the water supply pipe 33 to the water-containing chamber 35. The nozzle 32 then draws water from the water-containing chamber 35 and sprays water mist onto the coal on the screen plate 5 for cleaning and dust suppression.

[0075] The water-containing cavity 35 serves as the intermediate water storage structure of the nozzle 32, which can effectively alleviate the problem of unstable water pressure caused by the water pump 31, ensure that the nozzle 32 continuously and evenly sprays water mist, and improve the coal cleaning and dust removal effect.

[0076] like Figure 5 As shown, in one preferred embodiment, at least two cleaning mechanisms 3 are respectively arranged on opposite sides of the coal screening device, wherein water tanks 34 are arranged on both sides of the bottom of the cleaning tank 2, and water-containing chambers 35 are arranged on the side walls of both sides of the cleaning tank 2.

[0077] In this preferred embodiment, a cleaning mechanism 3 is provided on each side of the coal screening device, which can clean and reduce dust on the coal on the screen plate 5 from both sides, avoid the cleaning blind spot caused by unilateral spraying, improve the cleaning effect, reduce coal dust residue and dispersion, and thus further improve the working environment.

[0078] like Figure 1 As shown, in another embodiment, the feed hopper 1 is provided with a baffle plate 11 above the nozzle 32. In this embodiment, the feed hopper 1 is also provided with a baffle plate 11. The baffle plate 11 is located above the nozzle 32 and can prevent large pieces of coal from directly hitting the nozzle 32 during the process of coal falling from the feed hopper 1, preventing the nozzle 32 from being damaged due to force, improving the service life of the nozzle 32, and avoiding failure of the cleaning function.

[0079] like Figure 5 As shown, in one embodiment, the washing tank 2 includes a temporary storage space 22 for temporarily storing small coal particles;

[0080] Temporary storage space 22 is located below the sieve plate 5.

[0081] In this embodiment, the washing tank 2 also includes a temporary storage space 22, which is located below the screen plate 5 and is used to temporarily store small coal particles. This can effectively collect small coal particles that fall during the screening process, preventing them from scattering or flowing into the drainage system, and facilitating subsequent recycling.

[0082] like Figure 1 , Figure 5 As shown, in another embodiment, the cleaning tank 2 includes a water outlet pipe 23;

[0083] The water outlet pipe 23 runs through the bottom of the side wall of the cleaning tank 2 and is connected to the temporary storage space 22.

[0084] In this embodiment, the cleaning tank 2 also includes a water outlet pipe 23 that runs through the bottom of the side wall of the cleaning tank 2. The water outlet pipe 23 is connected to the temporary storage space 22, which can discharge the wastewater during the cleaning process out of the cleaning tank 2, thereby improving the overall cleanliness of the equipment.

[0085] Alternatively, some small coal particles collected during the washing process can be discharged along with the wastewater to prevent sedimentation and blockage caused by water accumulation from affecting the screening efficiency.

[0086] In one preferred embodiment, a coal filter screen for filtering small coal particles is provided between the water outlet pipe 23 and the temporary storage space 22.

[0087] In this preferred embodiment, the coal filter screen is set between the water outlet pipe 23 and the temporary storage space 22, that is, at the inlet of the water outlet pipe 23. It can effectively intercept small coal particles and prevent them from being carried away by the water flow and discharged outside the equipment, thereby reducing coal waste and improving resource utilization efficiency. It also achieves the initial separation of small coal particles and wastewater in the temporary storage space 22, prevents coal from clogging the water outlet pipe 23, and improves drainage efficiency.

[0088] like Figure 1 As shown, in another embodiment, the side wall of the cleaning tank 2 is provided with an opening, which is connected to the temporary storage space 22. A door 24 is provided at the opening, and the door 24 is hinged to the cleaning tank 2.

[0089] In this embodiment, an opening is provided on the side wall of the washing tank 2, and the opening is connected to the temporary storage space 22. A door 24 is provided at the opening, and the door 24 is hinged to the side wall of the washing tank 2, so that the operator can easily open the door 24 and directly take out the small coal particles accumulated in the temporary storage space 22, which simplifies the coal recycling process.

[0090] When the door 24 is closed, it can effectively seal the temporary storage space 22, preventing coal dust from escaping through the opening and reducing the risk of environmental pollution.

[0091] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0092] The above description is merely the principle and preferred embodiment of this application. It should be noted that for those skilled in the art, implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included within the technical scope of this invention. Based on the principle of this application, several other modifications can also be made, which should also be considered within the protection scope of this application.

Claims

1. A coal screening apparatus, characterised in that, It includes a feed hopper (1), a cleaning box (2) connected to the feed hopper (1), a cleaning mechanism (3) for cleaning coal, and an air filtration mechanism (4) for filtering air. The cleaning tank (2) is equipped with a sieve plate (5) arranged at an incline downwards. One side of the sieve plate (5) is connected to the inner wall of the cleaning tank (2), and the other side of the sieve plate (5) is inclined downwards and extends toward the discharge port (21) of the cleaning tank (2). The cleaning mechanism (3) includes a water pump (31), a nozzle (32), and a water supply pipe (33) connected between the water pump (31) and the nozzle (32). The nozzle (32) is disposed inside the cleaning tank (2) and above the sieve plate (5); The air filtration mechanism (4) includes a filter box (41) with an air cavity (411), a fan (42), a filter assembly (43), and an air outlet duct (44). The filter box (41) is installed outside the cleaning box (2). The fan (42) is connected to the filter box (41) and is used to supply air into the air cavity (411). The filter screen assembly (43) is disposed in the air cavity (411). The air outlet pipe (44) is connected to the filter box (41) and is used to discharge the air in the air cavity (411).

2. A coal screening apparatus as claimed in claim 1, wherein, The air filtration mechanism (4) also includes a sedimentation filter box (45) connected to the air outlet duct (44). The sedimentation filter box (45) includes a liquid chamber (451) and at least one air outlet (46), the liquid chamber (451) being filled with water, the end of the air outlet pipe (44) being inserted into the liquid chamber (451), and the air outlet (46) being located above the liquid chamber (451).

3. A coal sizing device according to claim 2, characterised in that, An air desiccant is provided at the air outlet (46).

4. A coal screening apparatus as claimed in claim 1, wherein, The filter assembly (43) includes a primary filter (431) and a secondary filter (432). The primary filter (431) is located on the side away from the air outlet duct (44), and the secondary filter (432) is located on the side closer to the air outlet duct (44).

5. A coal screening device according to claim 1, characterized in that, The cleaning mechanism (3) includes a water tank (34) disposed on the side wall of the cleaning tank (2); The water tank (34) is connected to the water pump (31).

6. A coal screening device according to claim 5, characterized in that, The cleaning mechanism (3) includes a water-containing cavity (35) disposed on the side wall of the cleaning tank (2); The water-containing chamber (35) is connected to the water pump (31) through the water supply pipe (33), and the nozzle (32) is connected to the water-containing chamber (35).

7. A coal screening device according to claim 1, characterized in that, The feed hopper (1) is provided with a baffle plate (11) above the nozzle (32).

8. A coal screening device according to claim 1, characterized in that, The cleaning box (2) includes a temporary storage space (22) for temporarily storing small coal particles. The temporary storage space (22) is located below the sieve plate (5).

9. A coal screening device according to claim 8, characterized in that, The cleaning tank (2) includes a water outlet pipe (23); The water outlet pipe (23) passes through the bottom of the side wall of the cleaning tank (2) and is connected to the temporary storage space (22).

10. A coal screening device according to any one of claims 8 or 9, characterized in that, The cleaning tank (2) has an opening on its side wall, which is connected to the temporary storage space (22). A door (24) is provided at the opening, and the door (24) is hinged to the cleaning tank (2).

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