An underground coal cleaning apparatus

Abstract

This utility model relates to the technical field of coal mining and processing equipment, and discloses an underground coal impurity removal device. The device includes a fixed frame, a magnetic separator drum rotatably mounted within the fixed frame, a first conveyor belt, and a second conveyor belt. The device also includes a coal chute fixedly connected within the fixed frame and a removable debris collection frame. The coal chute is inclinedly positioned between the coal-falling end of the first conveyor belt and the magnetic separator drum. When coal containing impurities falls, it is forcibly dispersed and slowed down by the coal chute, fully exposing any encased iron impurities. The exposed iron impurities are attracted by the magnetic zone of the magnetic separator drum and automatically fall into the debris collection frame as the drum rotates to the non-magnetic zone. The device may also include a motor to drive the magnetic separator drum and a scraper to clean the drum. This utility model, through the use of a coal chute, solves the technical problem of iron impurities being difficult to separate due to being encased in coal lumps, greatly improving the impurity removal efficiency. Furthermore, it has a compact structure, a high degree of automation, and is suitable for use in underground environments.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mining and processing equipment, and in particular to an underground coal impurity removal device. Background Technology

[0002] During underground coal mining and transportation, ferromagnetic impurities such as bolts, iron blocks, and tool fragments often get mixed into the raw coal due to equipment wear, component detachment, or human error. If these iron impurities are not removed in time, they can cause serious scratches, tears, or even damage to critical equipment such as belt conveyors, crushers, and screening machines. This not only leads to high maintenance costs and production interruptions but also causes equipment failures and poses serious safety hazards.

[0003] To address this issue, magnetic separation equipment is typically installed at critical nodes in coal conveyor belts, such as transfer points. Most existing magnetic separation devices rely on a strong magnetic field to adsorb iron impurities contained in the flowing coal, thus achieving separation. This method is particularly effective when processing dry, loose materials.

[0004] However, in actual underground operations, raw coal often contains a certain amount of moisture and has strong viscosity. Furthermore, when falling from one conveyor belt to the next, it typically falls in a concentrated, high-speed, lumpy flow. In this state, a large amount of iron impurities are tightly encased within the coal lumps, and the coal itself creates a shielding effect against the magnetic field. When these iron-impurity-encased coal lumps rapidly pass through the magnetic separation zone, the magnetic force of the separator struggles to penetrate the thick coal layer, failing to effectively attract the internal iron impurities. This results in a large amount of iron impurities "slipping through the net" and entering subsequent stages along with the coal, significantly reducing the impurity removal efficiency and failing to achieve the desired equipment protection. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an underground coal impurity removal device, which aims to improve the problem of low impurity removal efficiency in existing underground coal impurity removal devices, where iron impurities trapped inside the coal are difficult to effectively adsorb due to the coal falling in clumps. This utility model aims to provide an underground coal impurity removal device with an improved structure that can effectively solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an underground coal impurity removal device, comprising: a first conveyor belt, a second conveyor belt, a fixed frame, a magnetic separation drum; and a coal chute and a debris collection frame.

[0007] The coal chute is inclinedly positioned between the coal drop end of the first conveyor belt and the magnetic separator drum to forcibly disperse and decelerate the falling coal flow.

[0008] Furthermore, the magnetic separator drum is rotatably disposed within the fixed frame, the coal chute is fixedly connected within the fixed frame, and the debris collection frame is removably installed within the fixed frame and located below the magnetic separator drum.

[0009] Preferably, the underground coal impurity removal equipment further includes a column, which is disposed within the fixed frame, and the coal chute is fixedly connected to the column.

[0010] Preferably, the underground coal impurity removal equipment further includes a motor and a drive shaft. The motor is mounted on the fixed frame and is connected to the magnetic separator drum via the drive shaft to drive the magnetic separator drum to rotate.

[0011] Preferably, the underground coal impurity removal equipment further includes a scraper, which is fixed on the fixed frame and in contact with the outer peripheral surface of the magnetic separator drum to scrape off the attached impurities.

[0012] Preferably, the front end of the debris collection frame is provided with a handle, the upper opening edge of the debris collection frame is provided with a guide slope, and the outer wall of the debris collection frame is also provided with a limiting post for limiting the position.

[0013] Preferably, the underground coal impurity removal equipment further includes a coal collection frame, which is disposed below the magnetic separator drum and is used to guide the impurity-removed coal to the second conveyor belt.

[0014] Preferably, the coal collection frame is provided with a limiting rod for stably limiting its position above the second conveyor belt.

[0015] Preferably, the underground coal impurity removal equipment further includes a support plate, a first support, and a second support; the fixed frame, the first support, and the second support are all mounted on the support plate.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this utility model, by setting up a coal chute to forcibly disperse and slow down the coal falling from the conveyor belt, the problem of low impurity removal efficiency caused by the iron impurities inside the coal falling in clumps is solved. This achieves the technical effect of fully exposing the iron impurities and greatly improving the accuracy and efficiency of magnetic separation.

[0018] 2. This utility model, by adopting a structure that combines a rotatable magnetic separator with a magnetic zone and a non-magnetic zone with a debris collection frame, solves the problem that traditional iron removers require periodic shutdowns for manual cleaning, which interrupts the production process and is labor-intensive. It achieves the technical effect of automatic and continuous removal and collection of iron impurities, ensuring that the production process is not interrupted. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of an underground coal impurity removal device proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the fixed frame structure of an underground coal impurity removal device proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the coal chute structure of an underground coal impurity removal device proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the limiting rod structure of an underground coal impurity removal device proposed in this utility model;

[0023] Figure 5 This is a schematic diagram of the debris collection frame structure of an underground coal impurity removal device proposed in this utility model.

[0024] Legend:

[0025] 1. Bearing plate; 101. First support; 102. First conveyor belt; 103. Second support; 104. Second conveyor belt; 2. Fixed frame; 201. Motor; 202. Drive shaft; 203. Non-magnetic zone column; 204. Magnetized zone column; 3. Debris collection frame; 301. Limiting column; 302. Handle; 303. Guide slope; 4. Column; 401. Coal chute; 402. Scraper; 5. Coal collection frame; 501. Limiting rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please refer to Figures 1 to 5 This utility model provides an underground coal impurity removal device, which aims to solve the problem in the prior art that iron impurities are trapped and difficult to be effectively separated by magnetic separation due to the fact that underground coal falls in clumps, resulting in low impurity removal efficiency.

[0028] like Figure 1 and Figure 2As shown, the basic frame of the underground coal cleaning equipment includes a bearing plate 1, a first support 101, a second support 103, and a fixing frame 2. The first support 101 and the second support 103 are both installed on the bearing plate 1. The first conveyor belt 102 is supported by the first support 101, and the second conveyor belt 104 is supported by the second support 103. The fixing frame 2, as the mounting frame for the core components, is also installed on the bearing plate 1 and is located between the coal dropping end of the first conveyor belt 102 and the starting end of the second conveyor belt 104.

[0029] Inside the fixed frame 2, a magnetic separator is rotatably mounted. The outer circumferential surface of the magnetic separator includes a magnetic zone column 204 for adsorbing iron impurities and a non-magnetic zone column 203 that does not generate magnetic force. The core improvement of this utility model lies in the setting of the coal chute 401. The coal chute 401 is fixedly connected to the fixed frame 2 and is inclinedly set directly below the coal falling end of the first conveyor belt 102 and obliquely above the magnetic separator. This arrangement allows the coal containing impurities falling from the first conveyor belt 102 to first impact the inclined plate surface of the coal chute 401. Through the guiding and blocking effect of the coal chute 401, the originally concentrated coal flow is effectively dispersed into a uniform coal curtain and slowed down as it falls, thereby fully exposing the iron impurities wrapped inside the coal block, creating a prerequisite for the subsequent magnetic separator to efficiently adsorb iron impurities.

[0030] The magnetic separator is also equipped with a debris collection frame 3. The debris collection frame 3 can be pulled out and installed in the lower space of the fixed frame 2. The opening of the debris collection frame 3 faces the bottom of the magnetic separator and is used to collect iron impurities that automatically fall off the surface of the non-magnetic zone column 203 due to the loss of magnetic force during the rotation of the magnetic separator.

[0031] Please refer to the following carefully. Figure 2 , Figure 3 and Figure 4 The following is a detailed description of the structure and installation relationship of the coal chute 401, the magnetic separator drum, and the scraper 402:

[0032] The specific installation structure of the coal chute 401 is as follows: a column 4 is set inside the fixed frame 2. The column 4 plays a supporting role inside the fixed frame 2. The coal chute 401 is fixedly connected to the column 4. The column 4 ensures that the coal chute 401 has sufficient structural stability and rigidity when subjected to continuous impact of coal.

[0033] The drive mechanism of the magnetic separator drum includes a motor 201 and a transmission shaft 202. The motor 201 is mounted on the outer wall of the fixed frame 2. The motor 201 is connected to the magnetic separator drum through the transmission shaft 202. The motor 201 provides power for the continuous rotation of the magnetic separator drum, thereby realizing a continuous operation process of adsorption and automatic removal of iron impurities.

[0034] To ensure the cleanliness of the magnetic separator drum surface and prevent non-magnetic but sticky impurities (such as wet coal powder) from adhering and affecting the iron removal effect, the equipment also includes a scraper 402. The scraper 402 is fixed on the fixed frame 2, and the scraping edge of the scraper 402 is in close contact with the outer peripheral surface of the magnetic separator drum. When the magnetic separator drum rotates, the scraper 402 can scrape off the residues adhering to the surfaces of the magnetic zone column 204 and the non-magnetic zone column 203, so that the scraped residues fall into the debris collection frame 3 below.

[0035] As a preferred embodiment, to facilitate the periodic cleaning of collected iron impurities, please refer to... Figure 5 The structure of the debris collection frame 3 has been optimized. A handle 302 for easy manual pulling is welded to the front wall of the debris collection frame 3. An inwardly inclined guide slope 303 is integrally formed at the upper opening edge of the debris collection frame 3. The guide slope 303 can effectively guide iron impurities that fall off the magnetic separator to the inside of the collection frame and prevent impurities from scattering. A limiting post 301 for limiting is also fixedly installed on the outer wall of the debris collection frame 3. When the debris collection frame 3 is pushed back into the fixed frame 2, the limiting post 301 cooperates with the corresponding structure of the fixed frame 2 to block and accurately position, avoiding over-push or position deviation.

[0036] As another preferred embodiment, to ensure smooth transfer of clean coal after impurity removal, please refer to... Figure 4 The equipment also includes a coal collection frame 5; the coal collection frame 5 is located below the magnetic separator drum and on one side of the debris collection frame 3. The coal collection frame 5 is designed in the shape of a funnel, which can efficiently receive clean coal falling directly from the surface of the magnetic separator drum and guide the coal flow to the second conveyor belt 104 below.

[0037] As a further optimization of the coal collection frame 5, in order to ensure the positional stability of the coal collection frame 5 during equipment operation and to prevent the coal collection frame 5 from shifting due to equipment vibration or coal impact, a limiting rod 501 is also provided on the coal collection frame 5. The limiting rod 501 is used to stably limit the coal collection frame 5 above the second conveyor belt 104, ensuring that clean coal can fall accurately into the central area of ​​the second conveyor belt 104.

[0038] Working principle: During the impurity removal operation, coal containing iron impurities is conveyed to the top of the equipment via the first conveyor belt 102 and falls from the coal drop end of the first conveyor belt 102. The falling coal first collides and rubs against the inclined coal chute 401. Under the guiding and buffering effect of the coal chute 401, the concentrated coal flow is dispersed into a uniform and slowed-down "coal curtain" state. This process allows the iron impurities wrapped in coal blocks to be fully exposed. Subsequently, the dispersed coal flow continues to fall to the surface of the rotating magnetic separator below.

[0039] When the coal flow passes through the magnetic zone column 204 of the magnetic separator, the exposed iron impurities are rapidly adsorbed onto the surface of the magnetic zone column 204 due to the strong magnetic field force. The clean coal, as a non-magnetic material, is not affected by the magnetic force and passes directly through the magnetic field zone under the action of gravity, falling into the coal collection frame 5 below. It is then guided by the coal collection frame 5 to the second conveyor belt 104, completing the transfer of clean coal. The magnetic separator with adsorbed iron impurities continues to rotate under the drive of the motor 201. When the surface of the magnetic zone column 204 rotates to the position of the non-magnetic zone column 203, the magnetic field in that area disappears, the iron impurities lose their magnetic adsorption, and automatically fall off under their own gravity, falling into the debris collection frame 3 below. At the same time, the scraper 402 continuously scrapes the surface of the rotating magnetic separator to remove adhering coal powder and other impurities, ensuring the stability of the impurity removal efficiency.

Claims

1. An underground coal cleaning device, comprising a first conveyor belt (102); The second conveyor belt (104) and the fixed frame (2); A magnetic separator drum is rotatably mounted within the fixed frame (2) and located between the coal drop end of the first conveyor belt (102) and the second conveyor belt (104). The outer circumferential surface of the magnetic separator drum includes magnetic zone columns (204) and non-magnetic zone columns (203). Its characteristic is that... The underground coal cleaning equipment also includes a coal chute (401), which is fixedly connected to the fixed frame (2) and is inclined between the coal dropping end of the first conveyor belt (102) and the magnetic separator drum. The underground coal impurity removal equipment also includes a debris collection frame (3), which is removably installed in the fixed frame (2) and located below the magnetic separator to receive iron impurities falling from the non-magnetic zone column (203).

2. The underground coal impurity removal equipment according to claim 1, characterized in that, The equipment also includes a column (4), which is set inside the fixed frame (2), and the coal chute (401) is fixedly connected to the column (4).

3. The underground coal impurity removal equipment according to claim 1, characterized in that, The device also includes a motor (201) and a drive shaft (202). The motor (201) is mounted on the fixed frame (2). The motor (201) is connected to the magnetic separator drum via the drive shaft (202) to drive the magnetic separator drum to rotate.

4. The underground coal impurity removal equipment according to claim 1, characterized in that, The device also includes a scraper (402), which is fixed on the fixed frame (2) and in contact with the outer peripheral surface of the magnetic separator.

5. The underground coal impurity removal equipment according to claim 1, characterized in that, The front end of the debris collection frame (3) is provided with a handle (302), the upper opening edge of the debris collection frame (3) is provided with a guide slope (303), and the outer wall of the debris collection frame (3) is also provided with a limiting post (301) for limiting.

6. The underground coal impurity removal equipment according to claim 1, characterized in that, The device also includes a coal collection frame (5), which is located below the magnetic separator drum and is used to guide the cleaned coal to the second conveyor belt (104).

7. The underground coal impurity removal equipment according to claim 6, characterized in that, The coal collection frame (5) is provided with a limiting rod (501) for stably limiting its position above the second conveyor belt (104).

8. The underground coal impurity removal equipment according to claim 1, characterized in that, The device also includes a support plate (1), a first bracket (101) and a second bracket (103); the fixed frame (2) is installed on the support plate (1), the first conveyor belt (102) is supported by the first bracket (101), and the second conveyor belt (104) is supported by the second bracket (103).

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