Coal selecting device with anti-blocking function

Abstract

The utility model provides a kind of coal preparation plant with anti-blocking function belongs to coal preparation plant field, technical scheme is, a kind of coal preparation plant with anti-blocking function, including screening shell, screening shell is cuboid, the top and one side wall of screening shell are all open settings, the top of screening shell is equipped with vibration motor, the inside fixed of screening shell is baffle, baffle is embedded with screen in the inside, the bottom of baffle is fixed with impact plate, the top of impact plate and the bottom of screen are close, the below of impact plate is provided with the inside hollow lifting frame, the outer top of lifting frame is fixed with knock hammer, the inside of lifting frame is provided with cam, the outer contour of cam and the inner top of lifting frame abut, drive mechanism is provided on cam, drive mechanism can drive cam rotation. Advantage lies in, the device indirectly acts on screen by impact plate, avoids direct impact, effectively reduces the risk of screen local damage.

Description

Technical Field

[0001] This utility model belongs to the field of coal preparation equipment, specifically relating to a coal preparation device with anti-clogging function. Background Technology

[0002] In coal sorting and processing, the screen, as a core component of the coal preparation equipment, plays a crucial role in separating coal based on particle size. However, raw coal often contains sticky impurities such as clay, coal dust, and fine particles. During vibrating screening, these impurities easily adhere to the mesh openings or surface of the screen, causing clogging. Screen clogging not only significantly reduces sorting efficiency, resulting in substandard coal particle size, but also increases the operating load on the equipment, leading to excessive energy consumption.

[0003] Currently, to address the problem of screen clogging, the industry commonly uses a tapping method to clear the screen. Taking the patent with authorization announcement number CN222817317U as an example, its disclosed coal preparation device is equipped with a specialized tapping structure, which consists of a first motor, a first rotating rod, a tapping rod, and a sliding sleeve. During operation, the first motor provides the power source, driving the first rotating rod to rotate. Through mechanical transmission, the tapping rod reciprocates on the sliding sleeve, thus periodically tapping the screen. The impact force generated by the tapping clears impurities clogging the mesh, maintaining the normal operation of the screening process.

[0004] However, the anti-clogging method that relies on the reciprocating impact of a striking rod on the screen results in a high-frequency impact on the same spot of the screen over a long period of use, because the striking rod's trajectory remains constant. This concentrated and repeated force will gradually cause fatigue damage to the screen material in that area, eventually making it highly susceptible to localized screen breakage. Utility Model Content

[0005] This invention addresses the problem that direct impact on the screen can easily cause localized damage to the screen in existing technologies. It provides a coal preparation device with anti-clogging function, which can eliminate the need for direct impact on the screen and effectively reduce the risk of localized screen damage.

[0006] To solve the above problems, the technical solution adopted by this utility model is a coal preparation device with anti-clogging function, including a screening shell, which is rectangular in shape. The top and one side wall of the screening shell are open. A vibration motor is installed on the top of the screening shell. A partition is set inside the screening shell. The outer periphery of the partition is fixedly connected to the inner side wall of the screening shell. A screen is embedded inside the partition. A collision plate is fixed at the bottom of the partition. The top of the collision plate is in close contact with the bottom of the screen. A hollow lifting frame is set below the collision plate. A hammer is fixed at the top of the lifting frame. A cam is set inside the lifting frame. The outer contour of the cam abuts against the top of the inner side of the lifting frame. A drive mechanism is set on the cam. The drive mechanism can drive the cam to rotate.

[0007] In this technical solution, a vibrating motor is installed on the top of the screening housing, and a partition is set inside the partition. A screen is embedded inside the partition, and a collision plate is fixed to the bottom of the partition, with the top of the collision plate in close contact with the bottom of the screen. Below the collision plate is a hollow lifting frame, with a hammer fixed to the top of the lifting frame. A cam is installed inside the lifting frame, with its outer contour abutting against the inner top of the lifting frame. A drive mechanism is mounted on the cam, which drives the cam to rotate. The vibrating motor causes the screening housing to vibrate, assisting the screen in screening coal blocks. When the screen becomes clogged, the drive mechanism drives the cam to rotate. The rotating cam pushes the lifting frame vertically, causing the hammer on the top of the lifting frame to periodically strike the collision plate. The collision plate then drives the screen to vibrate, while avoiding direct impact from the hammer on the screen. Therefore, this device indirectly affects the screen through the collision plate, effectively reducing the risk of localized screen damage.

[0008] Furthermore, there are two collision plates, evenly distributed along the coal movement direction. Below each collision plate are two lifting frames, evenly distributed along the length of the collision plate. A hammer is fixed to the top of each lifting frame, and a cam is installed inside each lifting frame. The even distribution of the two collision plates along the coal movement direction covers the main movement path of the coal on the screen. Combined with the two lifting frames evenly distributed along the length of each collision plate, the force exerted by the hammer on the collision plate is dispersed along the length of the collision plate and the coal movement direction, avoiding concentrated local forces. This makes the force exerted when the collision plates drive the screen to vibrate more evenly, reducing the risk of damage to the screen due to uneven local forces. It also ensures consistent anti-clogging effect in different areas of the screen, preventing blockages caused by incomplete hammering in some areas.

[0009] Furthermore, the drive mechanism includes two drive shafts, each positioned below the two impact plates. Each drive shaft is coaxially and fixedly connected to a cam inside one of the two lifting frames below the corresponding impact plate. Both ends of each drive shaft penetrate the side wall of the screening housing and are rotatably connected to it. Pulleys are fitted and fixed to the ends of the two drive shafts on the same side of the screening housing, and a drive belt is wound between the two pulleys. The end of one drive shaft furthest from the pulley is fixedly connected to the output shaft of the drive motor, whose housing is fixed to the outer side wall of the screening housing. High transmission synchronization is achieved. Through the cooperation of the two pulleys and the drive belt, the two drive shafts rotate synchronously, thereby driving all the cams to operate synchronously, ensuring that each lifting frame drives the hammer to act on the impact plate at the same rhythm. This synchronous transmission structure avoids inconsistent striking force and frequency caused by asynchronous rotation of the cams, ensuring uniform force on the impact plate and screen, improving the stability of the anti-clogging effect, and reducing the risk of damage to the screen due to localized force differences.

[0010] Furthermore, each lifting frame has a slider fixed to its outer wall, and a fixing block is set below the slider. The fixing block is fixedly connected to the inner bottom of the screening housing, and a vertically arranged guide rod is fixed to the top of the fixing block. The upper end of the guide rod passes through the slider and is slidably connected to the slider. This precisely limits the lifting trajectory and avoids movement deviation. The guide rod is vertically fixed to the fixing block and passes through the slider, which strictly limits the lifting frame to move up and down only in the vertical direction. This prevents horizontal deviation, shaking, or tilting during the process of following the cam and driving the hammer to strike the collision plate. It ensures that the hammer always accurately acts on the designated area of ​​the collision plate, ensuring the effectiveness of the anti-blocking action. At the same time, it prevents friction or collision with surrounding components due to the lifting frame deviation, reducing component wear and the risk of failure.

[0011] Furthermore, a return spring is sleeved on the outside of the guide rod. The upper end of the return spring is fixedly connected to the bottom of the slider, and the lower end of the return spring is fixedly connected to the top of the fixed block. This assists in the rapid reset of the lifting frame, ensuring a stable striking frequency. When the cam protrusion rotates away from the lifting frame and stops pushing upward, the return spring can quickly push the slider upward using its own elastic tension, causing the lifting frame and the hammer to return to their original positions quickly. This ensures that the hammer can respond promptly to the next rotation of the cam, forming a continuous, high-frequency striking action. This automatic reset function requires no additional power drive, ensuring the stability of the striking frequency and avoiding the problems of longer striking intervals and reduced anti-blocking efficiency caused by the lag in the reset of the lifting frame.

[0012] Furthermore, a connecting plate is fixed to the outer wall of the screening housing. A sliding column, penetrating the connecting plate, is mounted on the connecting plate. A stop is fixed to the upper end of the sliding column, and a support column is fixed to the lower end. A buffer spring is sleeved on the outside of the sliding column. The upper end of the buffer spring abuts against the bottom of the connecting plate, and the lower end of the buffer spring abuts against the top of the support column. The bottom of the support column is fixedly connected to the support frame. This effectively buffers vibration transmission and reduces the impact on the foundation structure. When the vibrating motor drives the screening housing to vibrate, the buffer spring can absorb some of the vibration energy through its own elastic deformation, weakening the rigid vibration transmission between the screening housing and the support frame. This reduces the impact of vibration on the support frame and the installation foundation, preventing long-term high-frequency vibration from causing loosening, deformation, or fatigue damage to the support structure. It also reduces the diffusion of vibration to the surrounding environment and lowers the noise during equipment operation.

[0013] Furthermore, a base frame is installed below the support frame, on which two rotating shaft supports are fixed. These supports are symmetrically distributed on both sides of the support frame, and each support is equipped with a rotating shaft, which is fixedly connected to the support frame. An adjustment mechanism is installed on the base frame to adjust the tilt angle of the support frame. By changing the tilt angle of the support frame through the adjustment mechanism, the tilt degree of the screening shell and the internal screen can be flexibly adjusted. When the tilt angle increases, the coal moves faster on the screen, which is suitable for processing coal with larger particle sizes that is less prone to clogging. When the tilt angle decreases, the coal moves slower, which can extend the screening time and improve the separation effect of fine coal particles. This adjustability allows the equipment to adapt to the needs of different coal qualities and different screening accuracies, enhancing the equipment's versatility and practicality.

[0014] Furthermore, the adjustment mechanism includes an electric cylinder, the cylinder barrel of which is hinged to the base frame, and the end of the telescopic rod of the electric cylinder is hinged to the bottom of the support frame. The angle adjustment is precise and stable, adapting to the needs of fine screening. The electric cylinder, driven by a motor, extends and retracts the telescopic rod, enabling stepless adjustment of the support frame's tilt angle. It can precisely control the change in tilt angle, making it easier to accurately control the screening angle compared to manual or hydraulic adjustment. This meets the refined requirements of different coal qualities for screening time and flow rate, improving the stability of screening accuracy.

[0015] Furthermore, a coarse coal outlet is located near the opening on the side wall of the screening shell on the partition, and a fine coal outlet is located near the opening on the side wall of the screening shell at the bottom inside. This ensures precise separation of coarse and fine coal, preventing mixing. The partition divides the interior of the screening shell into a coarse coal retention area and a fine coal collection area. The corresponding coarse and fine coal outlets allow for direct discharge of the two types of materials from their respective areas, preventing mixing during the discharge process and ensuring the purity of the coal after screening, thus meeting the processing or usage requirements for different purposes.

[0016] Furthermore, a mounting plate is fixed to the top of the screening shell, and the vibrating motor is fixedly mounted on the top of the mounting plate. The mounting plate provides a stable and rigid mounting base for the vibrating motor, which can transmit the vibration force generated by the vibrating motor more directly and evenly to the entire screening shell, reducing the loss of vibration force during transmission. Compared with direct mounting on the side wall of the shell, the top mounting method can make the overall force on the screening shell more balanced, avoid excessive or insufficient local vibration, ensure consistent vibration amplitude in all areas of the screen, and improve the uniformity and efficiency of coal screening.

[0017] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: In this technical solution, a vibration motor is installed at the top of the screening shell, and a partition is provided inside, with a screen embedded in the partition. A collision plate is fixed at the bottom of the partition, closely attached to the screen. A hollow lifting frame is provided below the collision plate, and a hammer is fixed to the outer top of the lifting frame. A cam is installed inside the frame, with its outer contour abutting against the top of the lifting frame, and a drive mechanism is provided to drive its rotation. The vibration motor can drive the screening shell to vibrate, assisting the screen in screening coal blocks; when the screen becomes clogged, the drive mechanism is activated, driving the cam to rotate, pushing the lifting frame to move periodically in the vertical direction, causing the hammer to continuously strike the collision plate, thereby driving the screen to vibrate. In summary, this device indirectly acts on the screen through the collision plate, avoiding direct impact and effectively reducing the risk of localized damage to the screen. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural diagram illustrating a specific embodiment of the present invention. Figure 1 ; Figure 2 This is a structural diagram illustrating a specific embodiment of the present invention. Figure 2 ; Figure 3 This is a partial exploded view of a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the support frame in a specific embodiment of the present utility model; Figure 5 This is a schematic diagram of the knocking anti-blocking mechanism in a specific embodiment of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the knocking anti-blocking mechanism in a specific embodiment of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the knocking anti-blocking mechanism in a specific embodiment of the present invention. Figure 3 .

[0020] In the diagram: 1. Base frame; 101. Rotating shaft support; 102. Rotating shaft; 103. Support frame; 104. Control box; 105. Support column; 106. Sliding column; 107. Electric cylinder; 108. Rotating rod; 109. Stop block; 110. Buffer spring; 2. Screening shell; 201. Partition plate; 202. Screen; 203. Vibration motor; 204. Connecting plate; 205. Collision plate; 206. Coarse coal outlet; 207. Fine coal outlet; 208. Mounting plate; 3. Knocking anti-blocking mechanism; 301. Lifting frame; 302. Sliding block; 303. Guide rod; 304. Fixing block; 305. Knocking hammer; 306. Drive shaft; 307. Cam; 308. Drive motor; 309. Pulley; 310. Drive belt; 311. Return spring. Detailed Implementation

[0021] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0022] A coal preparation device with anti-clogging function, such as Figure 1-3 As shown, the screen includes a screening housing 2, which is rectangular in shape. The top and one side wall of the screening housing 2 are open. A vibration motor 203 is installed on the top of the screening housing 2, which causes the screening housing 2 to vibrate. A partition 201 is provided inside the screening housing 2. The outer periphery of the partition 201 is welded to the inner wall of the screening housing 2. A screen 202 is embedded in the partition 201, dividing the internal space of the screening housing 2 into upper and lower parts. Two collision plates 205 are welded to the bottom of the partition 201, and the two collision plates 205 are evenly distributed along the coal movement direction. The top of the collision plate 205 is in close contact with the bottom of the screen 202. A knocking anti-blocking mechanism 3 is provided below the collision plate 205. The knocking anti-blocking mechanism 3 can periodically knock the collision plate 205, which in turn causes the screen 202 to vibrate, thereby clearing the screen 202. At the same time, it can prevent the knocking hammer 305 from directly impacting the screen 202, effectively reducing the risk of local damage to the screen 202.

[0023] In this specific embodiment, a mounting plate 208 is fixed to the top of the screening housing 2. The mounting plate 208 is generally inverted U-shaped. The flat plate of the mounting plate 208 is attached to the top of the screening housing 2 and connected by welding. The inner sides of the two vertical plates of the mounting plate 208 are attached to the two outer walls of the screening housing 2 and connected by welding. The vibration motor 203 is fixedly mounted on the top of the mounting plate 208 by bolts.

[0024] The partition 201 is a flat plate, and it is arranged parallel to the inner bottom of the screening housing 2. A connecting opening is provided on the partition 201, the shape of which is adapted to the screen 202. The screen 202 is embedded in the connecting opening and fixedly connected by bolts. A coarse coal outlet 206 is provided on the partition 201 near the opening on the side wall of the screening housing 2, and the coarse coal remaining on the screen 202 is discharged from the coarse coal outlet 206. A fine coal outlet 207 is provided at the inner bottom of the screening housing 2 near the opening on the side wall of the screening housing 2, and the fine coal passing through the screen 202 is discharged from the fine coal outlet 207.

[0025] like Figure 5-7 As shown, in this specific embodiment, the knocking anti-blocking mechanism 3 includes a lifting mechanism and a driving mechanism. The lifting mechanism includes four hollow lifting frames 301, evenly distributed below the two impact plates 205. Two lifting frames 301 are correspondingly arranged below each impact plate 205, and the two lifting frames 301 are evenly distributed along the length of the impact plate 205. A knocking hammer 305 is welded to the outer top of each lifting frame 301, and a cam 307 is provided inside each lifting frame 301. The outer contour of the cam 307 abuts against the inner top of the corresponding lifting frame 301. The driving mechanism is mounted on the cam 307 and can drive the cam 307 to rotate.

[0026] The drive mechanism includes two drive shafts 306, which are respectively arranged below the two collision plates 205. Each drive shaft 306 passes through two lifting frames 301 below the corresponding collision plate 205 and is coaxially and fixedly connected to cams 307 inside the two lifting frames 301. When the drive shaft 306 rotates, the cams 307 inside the corresponding two lifting frames 301 rotate synchronously. In addition, the two sides of the lifting frames 301 corresponding to the drive shafts 306 are open, so that the lifting frames 301 will not interfere with the drive shafts 306 when they move up and down. At the same time, both ends of each drive shaft 306 pass through the side wall of the screening housing 2 and are rotatably connected to the screening housing 2 through bearings. The ends of the two drive shafts 306 on the same side of the screening housing 2 are respectively fitted with pulleys 309, and a drive belt 310 is wrapped around the two pulleys 309. One of the drive shafts 306 is fixedly connected to the output shaft of the drive motor 308 via a coupling at the end away from the pulley 309. The housing of the drive motor 308 is fixed to the outer wall of the screening housing 2 by bolts.

[0027] Each lifting frame 301 has a slider 302 welded to its outer side wall on both sides. A fixing block 304 is provided below the slider 302. The fixing block 304 is welded to the inner bottom of the screening housing 2. A vertically arranged guide rod 303 is welded to the top of the fixing block 304. The upper end of the guide rod 303 passes through the slider 302 and is slidably connected to the slider 302. A return spring 311 is sleeved on the outside of the guide rod 303. The upper end of the return spring 311 is welded to the bottom of the slider 302, and the lower end of the return spring 311 is welded to the top of the fixing block 304.

[0028] like Figure 4 As shown, multiple connecting plates 204 are fixed on the outer wall of the screening housing 2. The multiple connecting plates 204 are symmetrically distributed on both sides of the screening housing 2. Each connecting plate 204 is provided with a sliding column 106 that penetrates the connecting plate 204. A stop block 109 is welded to the upper end of the sliding column 106, and a support column 105 is welded to the lower end of the sliding column 106. A buffer spring 110 is sleeved on the outside of the sliding column 106. The upper end of the buffer spring 110 abuts against the bottom of the connecting plate 204, and the lower end of the buffer spring 110 abuts against the top of the support column 105. The bottom of the support column 105 is welded to the support frame 103.

[0029] A base frame 1 is provided below the support frame 103. Two rotating shaft supports 101 are welded onto the base frame 1, symmetrically distributed on both sides of the support frame 103. Each rotating shaft support 101 is equipped with a rotating shaft 102, which can rotate on the rotating shaft support 101. The two rotating shafts 102 are welded to the two sides of the support frame 103 respectively. An adjustment mechanism is provided on the base frame 1, which can adjust the tilt angle of the support frame 103. The adjustment mechanism includes an electric cylinder 107. The cylinder barrel of the electric cylinder 107 is hinged to the base frame 1, and the end of the telescopic rod of the electric cylinder 107 is hinged to a rotating rod 108. Both ends of the rotating rod 108 are welded to the bottom of the support frame 103. In addition, a control box 104 is installed on the base frame 1. The control box 104 is electrically connected to the vibration motor 203, the drive motor 308, and the electric cylinder 107, and can control the start and stop of these devices.

[0030] The process is as follows: First, based on the actual screening requirements, a command is sent to the electric cylinder 107 via the control box 104 to control the extension rod of the electric cylinder 107 to extend or retract to a preset length. Since the cylinder barrel of the electric cylinder 107 is hinged to the base frame 1, and the end of the extension rod is hinged to the rotating rod 108, and the rotating rod 108 is fixed to the bottom of the support frame 103, the change in the length of the extension rod will cause the support frame 103 to rotate around the rotating shafts 102 on both sides, thereby precisely adjusting the tilt angle of the support frame 103, ultimately achieving the adjustment of the tilt angle of the screening housing 2. After the angle of the screening housing 2 is adjusted to the predetermined value that meets the production requirements, the electric cylinder 107 is stopped to ensure that the screening housing 2 maintains a stable tilt state.

[0031] Subsequently, the vibration motor 203 installed on the mounting plate 208 on the top of the screening shell 2 is started. The vibration force generated by the vibration motor 203 after it runs is evenly transmitted to the entire screening shell 2 through the mounting plate 208, so that the screening shell 2 drives the internal partition 201 and screen 202 to generate stable vibration synchronously, providing a power basis for subsequent coal screening.

[0032] Next, the raw coal to be screened is fed onto the surface of the screen 202 on the partition 201 through the opening at the top of the screening shell 2. Under the continuous vibration of the screening shell 2, the coal lumps move slowly along the inclined direction on the surface of the screen 202: coarse coal with a particle size larger than the aperture of the screen 202 cannot pass through the screen 202 and remains on the surface of the screen 202. Driven by the vibration inertia, it gradually moves towards the coarse coal outlet 206 on the partition 201 near the opening of the side wall of the screening shell 2, and is finally discharged from the coarse coal outlet 206, completing the collection of coarse coal; while fine coal with a particle size smaller than the aperture of the screen 202 passes through the mesh of the screen 202 under the vibration and falls into the inner bottom of the screening shell 2. Subsequently, driven by the vibration inertia, it moves towards the fine coal outlet 207 at the inner bottom of the screening shell 2 near the opening of the side wall, and is finally discharged from the fine coal outlet 207, realizing the classification and screening of coarse and fine coal.

[0033] During the screening process, if coal particles become stuck in the mesh of screen 202, causing screen 202 to become clogged, the drive motor 308, which is fixed to the outer wall of the screening housing 2, will be activated. After the drive motor 308 starts running, its output shaft drives a transmission shaft 306 connected to it to rotate synchronously through a coupling. A pulley 309 is sleeved on the end of the transmission shaft 306 located on the same side of the screening housing 2. As the transmission shaft 306 rotates, the pulley 309 also rotates synchronously. Through the transmission belt 310 wrapped between the two pulleys 309, the pulley 309 on the other transmission shaft 306 rotates synchronously, thereby causing the other transmission shaft 306 to rotate together with the pulley 309, ultimately achieving synchronous and same-speed rotation of the two transmission shafts 306.

[0034] Since each drive shaft 306 passes through the two lifting frames 301 below the corresponding collision plate 205 and is coaxially fixed with the cam 307 inside the lifting frame 301, when the two drive shafts 306 rotate synchronously, they will drive all the cams 307 inside the lifting frames 301 to rotate synchronously. During the rotation of the cam 307, its outer contour will periodically push the inner top of the lifting frame 301, causing the lifting frame 301 to make periodic lifting and lowering movements in the vertical direction; while the hammer 305 welded to the outer top of the lifting frame 301 will move synchronously with the lifting frame 301. When the lifting frame 301 rises, the hammer 305 will periodically strike the collision plate 205. When the impact plate 205 is struck, it will generate local vibration. This vibration is directly transmitted to the screen 202 that is in close contact with it. The vibration causes the coal particles stuck in the mesh of the screen 202 to fall off, thus clearing the screen 202. At the same time, with the indirect transmission effect of the impact plate 205, the hammer 305 can be completely avoided from directly impacting the screen 202, effectively preventing the screen 202 from being damaged due to excessive local force.

[0035] During the lifting and lowering movement of the lifting frame 301, the sliders 302 welded to the outer side walls of both sides of the lifting frame 301 move synchronously with the lifting frame 301. Since the sliders 302 are fitted onto the vertical guide rod 303 on the top of the fixed block 304, and the sliders 302 and the guide rod 303 are in sliding fit, the guide rod 303 will strictly limit the movement trajectory of the sliders 302, ensuring that the sliders 302 can only move along the axis of the guide rod 303. This limits the lifting frame 301 to only move vertically, preventing the lifting frame 301 from horizontally deviating, tilting, or swaying during the movement, and ensuring that the hammer 305 always accurately strikes the predetermined position of the collision plate 205.

[0036] Meanwhile, the return spring 311, sleeved on the outside of the guide rod 303, deforms synchronously with the movement of the slider 302: when the slider 302 moves downward with the lifting frame 301, the slider 302 compresses the return spring 311, causing the return spring 311 to store elastic potential energy; when the cam 307 rotates to the point where the protruding end leaves the top of the lifting frame 301, the return spring 311 quickly releases the stored elastic potential energy, using its own elastic tension to push the slider 302 upward, causing the slider 302 and the lifting frame 301 and the hammer 305 fixed thereto to quickly return to their initial positions. This automatic reset function requires no additional power drive, ensuring that the hammer 305 responds promptly to the next rotation of the cam 307, thereby forming a continuous, high-frequency striking action, continuously ensuring the unblocking effect of the screen 202, and maintaining the stable operation of the screening process.

[0037] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: In this specific embodiment, a vibration motor is installed at the top of the screening shell, and a partition is provided inside, with a screen embedded in the partition. A collision plate is fixed at the bottom of the partition, closely attached to the screen. A hollow lifting frame is provided below the collision plate, and a hammer is fixed to the outer top of the lifting frame. A cam is installed inside the frame, with its outer contour abutting against the top of the lifting frame, and a drive mechanism is provided to drive its rotation. The vibration motor can drive the screening shell to vibrate, assisting the screen in screening coal blocks; when the screen becomes clogged, the drive mechanism is activated, driving the cam to rotate, pushing the lifting frame to move periodically in the vertical direction, causing the hammer to continuously strike the collision plate, thereby driving the screen to vibrate. In summary, this device indirectly acts on the screen through the collision plate, avoiding direct impact and effectively reducing the risk of localized damage to the screen.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coal preparation device with anti-clogging function, comprising a screening shell (2), the screening shell (2) being rectangular parallelepiped, characterized in that, The top and one side wall of the screening housing (2) are both open. A vibration motor (203) is installed on the top of the screening housing (2). A partition (201) is provided inside the screening housing (2). The outer periphery of the partition (201) is fixedly connected to the inner side wall of the screening housing (2). A screen (202) is embedded inside the partition (201). A collision plate (205) is fixed at the bottom of the partition (201). The top of the collision plate (205) is in close contact with the bottom of the screen (202). A hollow lifting frame (301) is provided below the collision plate (205). A hammer (305) is fixed at the top of the lifting frame (301). A cam (307) is provided inside the lifting frame (301). The outer contour of the cam (307) abuts against the top of the lifting frame (301). A drive mechanism is provided on the cam (307). The drive mechanism can drive the cam (307) to rotate.

2. The coal preparation device with anti-clogging function according to claim 1, characterized in that, There are two collision plates (205). The two collision plates (205) are evenly distributed along the coal moving direction. Two lifting frames (301) are provided below each collision plate (205). The two lifting frames (301) are evenly distributed along the length direction of the collision plate (205). A hammer (305) is fixed on the outer top of each lifting frame (301), and a cam (307) is provided inside each lifting frame (301).

3. The coal preparation device with anti-clogging function according to claim 2, characterized in that, The drive mechanism includes two drive shafts (306), which are respectively arranged below the two collision plates (205). Each drive shaft (306) is coaxially and fixedly connected to the cam (307) inside the two lifting frames (301) below the corresponding collision plate (205). Both ends of each drive shaft (306) pass through the side wall of the screening housing (2) and are rotatably connected to the screening housing (2). The ends of the two drive shafts (306) located on the same side of the screening housing (2) are respectively fitted with pulleys (309), and a drive belt (310) is wrapped around the two pulleys (309). The end of one of the drive shafts (306) away from the pulley (309) is fixedly connected to the output shaft of the drive motor (308), and the housing of the drive motor (308) is fixed on the outer side wall of the screening housing (2).

4. The coal preparation device with anti-clogging function according to claim 2, characterized in that, Each lifting frame (301) has a slider (302) fixed on its outer side wall. A fixing block (304) is provided below the slider (302). The fixing block (304) is fixedly connected to the inner bottom of the screening housing (2). A vertically arranged guide rod (303) is fixed on the top of the fixing block (304). The upper end of the guide rod (303) passes through the slider (302) and is slidably connected to the slider (302).

5. The coal preparation device with anti-clogging function according to claim 4, characterized in that, A return spring (311) is sleeved on the outside of the guide rod (303). The upper end of the return spring (311) is fixedly connected to the bottom of the slider (302), and the lower end of the return spring (311) is fixedly connected to the top of the fixing block (304).

6. The coal preparation device with anti-clogging function according to claim 1, characterized in that, A connecting plate (204) is fixed to the outer wall of the screening housing (2). A sliding column (106) is provided on the connecting plate (204) and passes through the connecting plate (204). A stop block (109) is fixed to the upper end of the sliding column (106). A support column (105) is fixed to the lower end of the sliding column (106). A buffer spring (110) is sleeved on the outside of the sliding column (106). The upper end of the buffer spring (110) abuts against the bottom of the connecting plate (204). The lower end of the buffer spring (110) abuts against the top of the support column (105). The bottom of the support column (105) is fixedly connected to the support frame (103).

7. The coal preparation device with anti-clogging function according to claim 6, characterized in that, A base frame (1) is provided below the support frame (103). Two pivot supports (101) are fixed on the base frame (1). The two pivot supports (101) are symmetrically distributed on both sides of the support frame (103). A rotating shaft (102) is installed on each pivot support (101). The rotating shaft (102) is fixedly connected to the support frame (103). An adjustment mechanism is provided on the base frame (1). The adjustment mechanism can adjust the tilt angle of the support frame (103).

8. The coal preparation device with anti-clogging function according to claim 7, characterized in that, The adjustment mechanism includes an electric cylinder (107), the cylinder barrel of the electric cylinder (107) is hinged to the base frame (1), and the end of the telescopic rod of the electric cylinder (107) is hinged to the bottom of the support frame (103).

9. The coal preparation device with anti-clogging function according to claim 1, characterized in that, A coarse coal outlet (206) is provided on the partition (201) near the opening of the side wall of the screening shell (2), and a fine coal outlet (207) is provided on the bottom of the inner side of the screening shell (2) near the opening of the side wall of the screening shell (2).

10. The coal preparation device with anti-clogging function according to claim 1, characterized in that, A mounting plate (208) is fixed to the top of the screening housing (2), and a vibration motor (203) is fixedly installed on the top of the mounting plate (208).

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