A coal screening device used in coal mining

Abstract

This utility model relates to a coal screening device used in coal mining, belonging to the field of coal screening technology. It includes a shell, with a filter cylinder fixedly installed at the top inside the shell. A scraper is rotatably installed around the outer ring of the filter cylinder. Spiral blades are fixedly installed on the inner wall of the filter cylinder. A feed inlet is fixedly installed at the top of the filter cylinder, and a discharge outlet is fixedly installed at the bottom. A slag discharge pipe is fixedly installed at the bottom of the shell, and an air inlet pipe is fixedly installed on the discharge outlet. This utility model, through the array of through-holes in the air inlet and filter cylinder, forms a directional airflow from the inside to the outside of the filter cylinder, which can efficiently sweep away light dust, fine debris, and other impurities in the coal mine. Simultaneously, the spiral blades on the inner wall of the filter cylinder guide coal particles to fall in an orderly manner, reducing material accumulation.

Description

Technical Field

[0001] This utility model relates to the field of coal mine screening technology, and in particular to a coal mine screening device used in coal mine development. Background Technology

[0002] After coal mining, it needs to be separated from impurities such as gangue and dust using screening devices to improve coal quality. Traditional screening relies on technologies such as vibrating screens and mesh filters. However, existing equipment such as vibrating screens and fixed screens are prone to accumulation during the feeding process, resulting in incomplete separation of impurities. Some impurities remain in the coal, affecting product quality.

[0003] During the screening process, impurities tend to adhere to the inner wall of the equipment. Existing devices require manual cleaning after shutdown, which not only consumes manpower and prolongs maintenance time, but also causes production continuity to be damaged due to frequent shutdowns. Long-term accumulation of impurities can also corrode the inner wall of the equipment and shorten its service life. Utility Model Content

[0004] This utility model addresses the problems in the prior art by providing a coal screening device for coal mining, which is achieved through the following technical solution: A coal screening device for coal mining includes a shell, a filter cylinder fixedly installed at the top of the shell, a scraper rotatably installed on the outer ring of the filter cylinder, a spiral blade fixedly installed on the inner wall of the filter cylinder, a feed inlet fixedly installed at the top of the filter cylinder and a discharge outlet fixedly installed at the bottom, a slag discharge pipe fixedly installed at the bottom of the shell, and an air inlet pipe fixedly installed on the discharge outlet.

[0005] Furthermore, an air inlet is coaxially arranged on the inner wall of the filter cylinder. The top of the air inlet is closed and the bottom is connected to the air inlet pipe. Both the filter cylinder and the air inlet are provided with arrayed through holes.

[0006] Furthermore, a slot is fixedly provided on the outer ring of the filter cartridge near the top, and a retaining ring is fixedly provided on the scraper. The retaining ring is rotatably connected to the inner wall of the slot, and baffles are fixedly arranged in an array on the inner ring of the retaining ring. The baffles are inclined.

[0007] Furthermore, two scrapers are symmetrically fixedly arranged, and the outer side of the scraper abuts against the inner wall of the housing.

[0008] In summary, the beneficial technical effects of this utility model are as follows: This utility model has a simple structure and is easy to install and use. The device uses an array of through holes in the air inlet and filter cylinder to form a directional airflow from the inside to the outside of the filter cylinder, which can efficiently sweep away light dust, fine debris and other impurities in the coal mine. At the same time, the spiral blades on the inner wall of the filter cylinder guide the coal particles to fall in an orderly manner, reducing material accumulation and further improving the continuity of screening. The airflow impacts the inclined baffle on the retaining ring, driving the scraper to rotate synchronously. The scraper is in close contact with the inner wall of the shell, which can scrape off the slag in the annular gap in real time without manual disassembly and cleaning, avoiding the production interruption caused by frequent shutdowns for slag cleaning in traditional equipment. The screening process is completed in the closed space of the shell, and the impurities carried by the airflow are confined in the shell and finally discharged through the slag discharge pipe, reducing the diffusion of dust into the working environment. Attached Figure Description

[0009] Figure 1 This is a schematic diagram used to illustrate the internal structure of this utility model.

[0010] Figure 2 This is a schematic diagram used to demonstrate the structure of the scraper.

[0011] Figure 3 This is a structural schematic diagram used to illustrate the overall structure of this utility model.

[0012] Reference numerals in the attached drawings: 1. Shell; 2. Filter cylinder; 3. Scraper; 4. Spiral blade; 5. Feed inlet; 6. Discharge outlet; 7. Slag discharge pipe; 8. Air inlet pipe; 9. Snap ring; 10. Baffle plate; 11. Air inlet duct. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings.

[0014] Example like Figure 1-3 As shown, this utility model discloses a coal screening device for coal mining, including a shell 1. A filter cylinder 2 is fixedly installed at the top of the shell 1. A scraper 3 is rotatably installed on the outer ring of the filter cylinder 2. A spiral blade 4 is fixedly installed on the inner wall of the filter cylinder 2. A feed inlet 5 is fixedly installed at the top of the filter cylinder 2 and a discharge outlet 6 is installed at the bottom. A slag discharge pipe 7 is fixedly installed at the bottom of the shell 1. An air inlet pipe 8 is fixedly installed on the discharge outlet 6 and is connected to an external air source.

[0015] The filter cylinder 2 is coaxially provided with an air inlet duct 11. The top of the air inlet duct 11 is closed and the bottom is connected to the air inlet pipe 8. Both the filter cylinder 2 and the air inlet duct 11 are provided with arrayed through holes. This structure is used to blow away impurities and dust in the coal mine.

[0016] The filter cylinder 2 has a fixed groove near the top of its outer ring. The scraper 3 has a fixed retaining ring 9, which is rotatably connected to the inner wall of the groove. The inner ring of the retaining ring 9 has a fixed array of baffles 10, which are inclined and drive the scraper 3 to rotate through the airflow.

[0017] Two scrapers 3 are symmetrically fixedly arranged, and the outer side of the scraper 3 abuts against the inner wall of the housing 1. This structural design is used to scrape away the impurities accumulated on the inner wall.

[0018] The feed inlet 5 passes through the top of the housing 1, and the discharge outlet 6 passes through the bottom of the housing 1.

[0019] When this device is in use, the external air source is activated, and the airflow enters the air inlet duct 11 through the air inlet pipe 8. The airflow flows upward along the air inlet duct 11 and blows from the inside of the filter cylinder 2 to the outside through the array of through holes on the air inlet duct 11 and the filter cylinder 2. The coal to be processed is fed into the feed port 5 and falls into the filter cylinder 2. It moves downward along the spiral blades 4. Light impurities are blown into the housing 1 through the through holes of the filter cylinder 2 by the airflow. When the airflow passes through the groove of the outer ring of the filter cylinder 2, it impacts the inclined baffle 10 on the retaining ring 9. Due to the inclination of the baffle 10, the circumferential component of the airflow pushes the retaining ring 9 to rotate around the groove, which drives the scraper 3 to rotate synchronously. The outer side of the scraper 3 is in close contact with the inner wall of the housing 1. During the rotation, the impurities attached to the annular gap are continuously scraped off. The scraped impurities fall to the bottom of the housing 1 by gravity. The coal particles after being swept and cleaned fall to the discharge port 6 and are finally discharged from the discharge port 6. The impurities accumulated at the bottom of the housing 1 are discharged through the slag discharge pipe 7.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coal screening device for coal mining, comprising a housing (1), characterized in that: A filter cylinder (2) is fixedly installed at the top of the housing (1). A scraper (3) is rotatably installed on the outer ring of the filter cylinder (2). A spiral blade (4) is fixedly installed on the inner wall of the filter cylinder (2). A feed inlet (5) is fixedly installed at the top of the filter cylinder (2) and a discharge outlet (6) is installed at the bottom. A slag discharge pipe (7) is fixedly installed at the bottom of the housing (1). An air inlet pipe (8) is fixedly installed on the discharge outlet (6).

2. The coal screening device for coal mining according to claim 1, characterized in that: The filter cylinder (2) has an air inlet cylinder (11) coaxially arranged on its inner wall. The top of the air inlet cylinder (11) is closed and the bottom is connected to the air inlet pipe (8). Both the filter cylinder (2) and the air inlet cylinder (11) have through holes arranged in an array.

3. A coal screening device for coal mining according to claim 2, characterized in that: The filter cylinder (2) has a slot fixedly installed near the top of the outer ring. The scraper (3) has a retaining ring (9) fixedly installed on it. The retaining ring (9) is rotatably connected to the inner wall of the slot. The retaining ring (9) has baffles (10) fixedly installed in the inner ring array. The baffles (10) are inclined.

4. A coal screening device for coal mining according to claim 3, characterized in that: Two scrapers (3) are symmetrically fixed, and the outer side of the scraper (3) abuts against the inner wall of the shell (1).

5. A coal screening device for coal mining according to claim 4, characterized in that: The feed inlet (5) passes through the top of the housing (1), and the discharge outlet (6) passes through the bottom of the housing (1).

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