Coal pretreatment device with anti-blocking screen

Abstract

The utility model discloses a coal material pretreatment device with anti -blocking screen, related material pretreatment device technical field, include: frame, screening cylinder can rotatably install in the top of rack, and its one end is connected with drive arrangement, collecting hopper is located screening cylinder below and is accepted under the screen thing, a plurality of scrapers, along the axial extension of screening cylinder and is arranged in its outer surface periphery, the utility model discloses the vibration force that reciprocating impact of scraper and impact plate generates, passes through the scraper transmission to screening cylinder, and the material of being stuck in the screen hole is shaken and falls, guarantees the smooth progress of screening process and screening effect stability, these scrapers in the movement process can scrape the falling area in the collecting hopper, make the even distribution of the under -screen thing of falling, avoid the gathering of material in the collecting hopper and form the accumulation. This function can prevent the material of accumulation and screening cylinder contact, thereby guarantee the normal rotation of screening cylinder and the stable of material screening performance.

Description

Technical Field

[0001] This utility model relates to the technical field of material pretreatment devices, specifically a coal pretreatment device with an anti-clogging screen. Background Technology

[0002] In the process of coal mining, processing, and utilization, coal pretreatment is a crucial step that directly affects subsequent production efficiency and product quality. Screening, as one of the core processes in coal pretreatment, is mainly used to separate coal particles of different sizes, providing qualified raw materials for subsequent processes such as washing, crushing, and combustion.

[0003] Currently, most coal screening devices used in the industry employ structures such as drum screens and vibrating screens. Among them, drum screens are particularly prevalent in large-scale coal screening scenarios due to their large processing capacity and stable operation. However, in actual operation, the screen mesh of drum screens is easily clogged by coal, affecting screening efficiency. Especially when the coal contains fine particulate impurities such as mud and coal dust, these materials tend to accumulate at the screen openings, gradually causing blockage.

[0004] Screen clogging not only leads to a significant decrease in screening efficiency, preventing qualified coal particles from passing through the screen in a timely manner and increasing the processing load of subsequent processes, but also causes uneven material accumulation on the screen surface, resulting in unbalanced force on the drum, aggravating equipment wear, and shortening the service life of the device. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides a coal pretreatment device with an anti-clogging screen.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A coal pretreatment device with an anti-clogging screen, comprising:

[0008] frame;

[0009] A screening drum is rotatably mounted on the top of the frame, and one end of it is connected to a drive device;

[0010] A collection hopper is located below the screening drum and receives the undersize material.

[0011] Multiple scrapers extend axially along the screening drum and are arranged circumferentially on its outer surface;

[0012] An impact plate is rotatably mounted on the top of the frame;

[0013] The impact plate is located outside the rotation trajectory of the screening drum, and its rotation plane intersects with the movement plane of the scraper.

[0014] As the screening drum rotates, the scraper pushes the impact plate to rotate around the shaft to its highest position. When the scraper passes the impact plate, the impact plate swings back under the action of gravity and hits the subsequent scraper.

[0015] Preferably, the impact end of the impact plate is provided with a counterweight, the mass of which accounts for 15%-40% of the total mass of the impact plate.

[0016] Preferably, a guide angle of 30°-60° is formed between the impact contact surfaces of the scraper and the impact plate.

[0017] Preferably, the maximum distance between the scraper and the impact plate is less than the height of the scraper, but greater than half the height of the scraper.

[0018] Preferably, the distance D between two adjacent scrapers and the swing radius R of the impact plate satisfy: 1.2R ≤ D ≤ 1.8R.

[0019] Preferably, the impact plate is mounted on the frame via a connecting frame, the connecting frame being fixed to the frame and having a bearing seat for the impact plate to rotate.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] To prevent screen clogging: The reciprocating impact of the scraper and the impact plate generates vibration, which is transmitted to the screening drum through the scraper. This dislodges material stuck in the screen holes, ensuring smooth screening and stable screening results. During their movement, the scrapers also scrape the material drop area in the collection hopper, ensuring even distribution of the undersize material and preventing accumulation. This prevents accumulated material from contacting the screening drum, thus ensuring normal rotation of the drum and stable material screening performance. Attached Figure Description

[0022] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the coal pretreatment device with anti-clogging screen of this utility model;

[0024] Figure 2 This is a second-view three-dimensional structural diagram of the coal pretreatment device with anti-clogging screen of this utility model;

[0025] Figure 3 This is a side view of the coal pretreatment device with anti-clogging screen of this utility model;

[0026] Figure 4This is a cross-sectional view (AA) of the coal pretreatment device with anti-clogging screen of this utility model.

[0027] The diagram shows the following labels: 1. Frame; 2. Screening drum; 3. Collection hopper; 4. Scraper; 5. Impact plate; 6. Connecting frame. Detailed Implementation

[0028] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0029] Example

[0030] like Figures 1-4 As shown, a coal pretreatment device with an anti-clogging screen includes:

[0031] Frame 1: Serves as the supporting structure for the entire device, providing a mounting base for other components and ensuring the stability and integrity of the device.

[0032] Screening drum 2: Rotatably mounted on the top of frame 1, with a feed inlet at one end and a discharge outlet at the other end. One end is connected to a drive unit, which can be a motor, a drive pulley, a driven pulley, and a transmission belt to drive the screening drum 2 to rotate. Under the drive of the drive unit, the screening drum 2 can rotate to achieve the screening of coal.

[0033] Collection hopper 3: Located below the screening drum 2, its main function is to receive the undersize material that passes through the screening drum 2, facilitating the collection and subsequent processing of the undersize material.

[0034] Multiple scrapers 4: extending axially along the screening drum 2 and arranged circumferentially on its outer surface. When the screening drum 2 rotates, the scrapers 4 move with it. On the one hand, the scrapers 4 scrape the material falling area in the collection hopper 3, so that the screened material does not gather together and cause the screening drum 2 to come into contact with the material, thereby ensuring the material screening performance; on the other hand, the scrapers 4 interact with the impact plate 5 during the movement.

[0035] Impact plate 5: Rotatably mounted on the top of the frame 1, located outside the rotation trajectory of the screening drum 2, and its rotation plane intersects with the movement plane of the scraper 4. In this way, after the impact plate 5 is driven by the scraper 4 to store energy and detach, it will collide with the scraper 4 that rotates later, generating vibration force. The vibration force will shake the material in the screening hole above the screening drum 2 down, ensuring the subsequent screening effect.

[0036] The impact end of the impact plate 5 may also be equipped with a counterweight, the mass of which accounts for 15%-40% of the total mass of the impact plate 5. This design helps to enhance the impact force of the impact plate 5 during its swing.

[0037] Connecting frame 6: Fixed to the frame 1, the impact plate 5 is rotatably connected to the connecting frame 6 through a bearing, and is provided with a bearing seat for the impact plate 5 to rotate. The impact plate 5 is installed on the frame 1 through the connecting frame 6 to ensure that the impact plate 5 can rotate stably.

[0038] First, the frame 1 serves as the supporting foundation for the entire device, providing a stable mounting platform for all components such as the screening drum 2 and the impact plate 5, ensuring the overall stability of the device during operation.

[0039] When the device is started, the drive unit connected to one end of the screening drum 2 begins to work, driving the screening drum 2 to rotate. The coal to be processed is fed into the screening drum 2, and as the drum rotates, the coal continuously tumbles and moves inside the drum. During this process, fine coal that meets the screening requirements (undersize material) will fall through the screen holes of the screening drum 2, while larger coal particles continue to move inside the drum and are eventually discharged from the other end of the drum, completing the preliminary screening process.

[0040] The undersize material falling below the screening drum 2 will be collected by the collection hopper 3. The collection hopper 3 facilitates the centralized collection and subsequent processing of the undersize material and avoids the scattering of the material.

[0041] As the screening drum 2 rotates, multiple scrapers 4 extending axially and arranged circumferentially on its outer surface move along with the drum. On one hand, these scrapers 4 scrape the material drop area within the collection hopper 3 during their movement, ensuring that the undersize material is evenly distributed and preventing material from accumulating in the collection hopper 3. This prevents accumulated material from contacting the screening drum 2, thus ensuring the normal rotation of the screening drum 2 and the stability of the material screening performance.

[0042] On the other hand, the scraper 4 interacts with the impact plate 5 as it rotates with the screening drum 2. The impact plate 5 is rotatably connected to the connecting frame 6 fixed on the frame 1 via bearings. The bearing seats on the connecting frame 6 provide stable rotational support for the impact plate 5, causing its rotational plane to intersect with the motion plane of the scraper 4. When the scraper 4 moves to the position of contact with the impact plate 5, it pushes the impact plate 5 to rotate around the bearings on the connecting frame 6, allowing the impact plate 5 to gain potential energy (energy storage). When the scraper 4 continues to rotate and disengages from the impact plate 5, the energy-stored impact plate 5 will swing back under its own weight (especially when there is a counterweight at the impact end of the impact plate 5, the mass of the counterweight accounts for 15%-40% of the total mass of the impact plate 5, which can enhance the swinging force), impacting the subsequent rotating scraper 4. The subsequently impacted scraper 4 will repeat the above energy storage action, and so on.

[0043] This impact generates vibration, which is transmitted to the screening drum 2 through the scraper 4, causing the screening drum 2 to vibrate. The vibration dislodges material stuck in the screen holes of the screening drum 2, effectively preventing screen blockage and ensuring the smooth progress of subsequent screening processes and the stability of screening results.

[0044] Through the coordinated operation of the above components, the device achieves efficient screening of coal, effective collection of undersize material, and anti-clogging function of the screen, thereby completing the pre-treatment of coal.

[0045] Achieving efficient coal screening: By rotating the screening drum 2, the coal material tumbles and moves inside, achieving the separation of coarse and fine coal materials and completing the preliminary screening operation.

[0046] Effective collection of screened material: The collection hopper 3 below the screening drum 2 can collect the screened material in a centralized manner, which facilitates subsequent processing and prevents the material from scattering.

[0047] To prevent screen clogging: The reciprocating impact of the scraper 4 and the impact plate 5 generates vibration force, which is transmitted to the screening drum 2 through the scraper 4, shaking off the material stuck in the screen holes, ensuring smooth screening process and stable screening effect.

[0048] To ensure stable operation of the device: Frame 1 provides a stable installation platform for all components, ensuring overall stability during device operation; the bearing seat on the connecting frame 6 provides stable rotation support for the impact plate 5, ensuring orderly cooperation of all components.

[0049] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A coal pretreatment device with an anti-clogging screen, characterized in that, include: Rack (1); Screening drum (2) is rotatably mounted on the top of the frame (1), and one end of it is connected to a drive device; A collection hopper (3) is located below the screening drum (2) and receives the screened material; Multiple scrapers (4) extend axially along the screening drum (2) and are arranged circumferentially on its outer surface; Impact plate (5) is rotatably mounted on the top of the frame (1); The impact plate (5) is located outside the rotation trajectory of the screening drum (2), and its rotation plane intersects with the motion plane of the scraper (4). When the scraper (4) rotates with the screening drum (2), it pushes the impact plate (5) to rotate around the shaft to the highest position. When the scraper (4) passes the impact plate (5), the impact plate (5) swings back under the action of gravity and hits the subsequent scraper (4).

2. The coal pretreatment device with anti-clogging screen according to claim 1, characterized in that: The impact plate (5) is provided with a counterweight at the impact end, and the mass of the counterweight accounts for 15%-40% of the total mass of the impact plate (5).

3. A coal pretreatment device with an anti-clogging screen according to claim 2, characterized in that: The scraper (4) and the impact plate (5) form a guide angle of 30°-60° between their impact contact surfaces.

4. A coal pretreatment device with an anti-clogging screen according to claim 3, characterized in that: The maximum distance between the scraper (4) and the impact plate (5) is less than the height of the scraper (4) and greater than half the height of the scraper (4).

5. A coal pretreatment device with an anti-clogging screen according to claim 4, characterized in that: The distance D between two adjacent scrapers (4) and the swing radius R of the impact plate (5) satisfy: 1.2R ≤ D ≤ 1.8R.

6. A coal pretreatment device with an anti-clogging screen according to claim 5, characterized in that: The impact plate (5) is mounted on the frame (1) via a connecting frame (6). The connecting frame (6) is fixed to the frame (1) and is provided with a bearing seat for the impact plate (5) to rotate.

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