Coal gangue screening device

Abstract

This invention relates to the field of coal gangue screening technology, specifically to a coal gangue screening device, comprising: a housing with an arc-shaped channel inside, and a vertically positioned screening chamber located below the top of the arc-shaped channel; a first large-aperture plate and a small-aperture plate, arranged vertically within the screening chamber, the top and sides of which are connected to the arc-shaped channel via a top discharge port and a side discharge port, respectively; a hopper, slidably disposed within the arc-shaped channel, the hopper's inner cavity being divided into an upper cavity and a lower cavity by a second large-aperture plate, the right side of which has a discharge port for connecting to the side discharge port; and a swing arm, its outer end rotatably connected to the side of the hopper, and its inner end connected to a power component. Through the pre-screening effect of the hopper, the classification screening by the first large-aperture plate and the small-aperture plate, and the hopper's classified feeding of materials to the first large-aperture plate and the small-aperture plate, classified screening is achieved, improving screening efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal gangue screening technology; specifically, this invention relates to a coal gangue screening device. Background Technology

[0002] Coal gangue is a solid waste generated during coal mining and washing. It is a dark gray rock with a low carbon content and harder than coal, which is associated with coal seams during coal formation. To avoid resource waste caused by uneven particle size and to ensure more comprehensive development and utilization of coal gangue resources, it is necessary to use coal gangue screening devices to separate the crushed coal gangue according to particle size, so that coal gangue of different particle sizes can be fully utilized.

[0003] For example, a filtration device and method for treating coal gangue, disclosed in CN 118142858 A, is equipped with a pushing component, a sleeve lifting block, and an inner box that rises, enabling the inner box to sway up and down for filtration. At the same time, when the inner box rises, it drives the pushing block to move, and a fixing rod limits the pushing block, causing it to rise vertically. The rising pushing block is squeezed by the inclined surface of the inclined block, causing the inner box to sway horizontally as well. Compared to only swaying left and right, this improves the filtration effect of coal gangue.

[0004] However, the filtration device uses only a single box for screening, resulting in low screening accuracy. At the same time, during the screening process, a large amount of coal gangue accumulates in one box, and some large coal gangue has poor disturbance effect, which will block the screen holes and affect the screening efficiency.

[0005] In view of this, this application provides a coal gangue screening device. Summary of the Invention

[0006] In view of this, the present invention provides a coal gangue screening device, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0007] To achieve the aforementioned objectives, the present invention provides a coal gangue screening device, comprising:

[0008] The box body has a fan-shaped structure, and an arc-shaped channel is provided inside the box body. A vertical screening chamber is provided below the top of the arc-shaped channel.

[0009] The first large sieve plate and the small sieve plate are arranged vertically in the screening chamber. The top and side of the screening chamber are connected to the arc-shaped channel through the top discharge port and the side discharge port, respectively. The side discharge port is located between the first large sieve plate and the small sieve plate, and the end of the first large sieve plate and the small sieve plate away from the side discharge port is inclined downward.

[0010] The hopper is slidably disposed in the arc-shaped channel, and the four sides of the hopper are respectively attached to the arc-shaped channel. The inner cavity of the hopper is divided into an upper cavity and a lower cavity by a second large screen plate. The right side of the lower cavity is provided with a discharge port for connecting to the side discharge port.

[0011] The swing arm has its outer end rotatably connected to the side of the hopper and its inner end connected to a power component. The swing arm is used to drive the hopper to move between the top and bottom of the arc-shaped channel. When the hopper is at the top of the arc-shaped channel, the discharge port is located in the top discharge port.

[0012] The outer wall of the arc-shaped channel is provided with a feed inlet, and the side wall of the screening chamber away from the feed inlet is provided with an upper discharge outlet and a lower discharge outlet, respectively. The coal gangue on the first large screen plate and the small screen plate is discharged from the upper discharge outlet and the lower discharge outlet, respectively.

[0013] In the coal gangue screening device described above, optionally, the hopper includes a bottom plate, side plates fixedly disposed on the front and rear sides of the bottom plate, a first outer arc plate fixedly disposed between the outer end of the bottom plate and the two side plates, a second outer arc plate disposed on the top of the lower outer arc plate, and an inner arc plate disposed above the discharge port. The first and second outer arc plates are both in contact with the inner wall surface of the arc channel corresponding to the feed port, and the inner arc plate is in contact with the inner wall surface of the arc channel corresponding to the side discharge port. The outer end of the second large screen plate is fixedly connected to the bottom of the second outer arc plate.

[0014] In the coal gangue screening device described above, optionally, when the hopper is located at the bottom end of the arc-shaped channel, the bottom plate is in a state where the outer end is inclined downward, the second large screen plate is parallel to the bottom plate, and a third large screen plate with the inner end inclined downward is provided above the second large screen plate. A rolling channel for coal gangue to roll down is formed between the inner end of the third large screen plate and the second large screen plate.

[0015] In the coal gangue screening device described above, optionally, the bottom end of the inner arc plate side is rotatably connected to the side plate, the outer end of the third large screen plate is rotatably connected to the top end of the second outer arc plate, and a support block supporting the outer end of the lower surface of the third large screen plate is fixedly provided at the top end of the inner side of the second outer arc plate.

[0016] In the coal gangue screening device described above, optionally, the inner end of the second large screen plate is rotatably connected to the bottom end of the inner arc plate, and the bottom end of the inner arc plate is provided with a top block. When the inner arc plate is opened, the top block pushes the second large screen plate, the second outer arc plate and the third large screen plate to rotate as a whole.

[0017] In the coal gangue screening device described above, optionally, when the bottom end of the inner arc plate enters the top discharge port, the end of the inner arc plate away from the second large screen plate is supported on the upper surface of the first large screen plate and is located on the side of the first large screen plate with its rotation axis facing the upper discharge port.

[0018] In the coal gangue screening device described above, optionally, a stop block is provided on the side wall of the upper cavity. The stop block is used to restrict the outer end of the second large screen plate within the plate surface area of ​​the side plate when the second large screen plate rotates with the inner arc plate.

[0019] In the coal gangue screening device described above, optionally, the first large screen plate and the small screen plate are rotatably installed in the screening chamber. A driving component is provided between the first large screen plate and the small screen plate on one side near the arc-shaped channel. One end of the driving component is connected to the swing arm. When the swing arm swings, the driving component drives the first large screen plate and the small screen plate to swing.

[0020] In the coal gangue screening device described above, optionally, the drive assembly includes a lifting plate, a first rotating rod, a second rotating rod, a transverse track, a third rotating rod, and a guide groove. The sides of the first large screen plate and the small screen plate are provided with strip-shaped grooves on the side facing the lateral channel at the rotation axis. The first rotating rod is slidably disposed within the strip-shaped groove, and its outer end is rotatably mounted on the lifting plate. Transverse tracks are slidably disposed on both sides of the housing, and the transverse tracks are wavy. The second rotating rod is slidably disposed within the transverse tracks and rotatably mounted on the bottom end of the lifting plate. The third rotating rod is rotatably mounted on the outer surface of the transverse tracks. The guide groove is disposed on a swing arm, and the third rotating rod is slidably disposed within the guide groove. When the swing arm swings upward, the guide groove pushes the transverse track away from the curved track via the third rotating rod. When the swing arm swings downward, the guide groove pushes the transverse track away from the curved track via the third rotating rod.

[0021] In the coal gangue screening device described above, optionally, a pull groove is provided at the bottom of the screening chamber, the side feed port is inclined downward toward one end of the screening chamber, and the inclination angle of the side feed port is greater than the inclination angle of the first large screen plate and the small screen plate.

[0022] The coal gangue screening device of the present invention employs a hopper that moves within an arc-shaped channel. The pre-screening action of the hopper, combined with the secondary screening action of the first large screen plate and the small screen plate, enables multiple screening and classification of coal gangue, thereby improving the screening efficiency. Furthermore, during the unloading process at the top of the arc-shaped channel, the inner arc plate, under the gravity of the coal gangue, drives the second large screen plate, the second outer arc plate, and the third large screen plate. This allows the coal gangue falling from the upper and lower cavities to be separated on the first large screen plate, further improving the unloading efficiency of the hopper. Attached Figure Description

[0023] The disclosure of this invention will become more apparent from 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 invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the coal gangue screening device of the present invention.

[0025] Figure 2 For the present invention Figure 1 A sectional view.

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the middle hopper.

[0027] Figure 4 This is a schematic diagram of the structure of the hopper of the present invention.

[0028] Figure 5 For the present invention Figure 4 A schematic diagram showing the disassembly of the middle hopper.

[0029] Figure 6 This is a schematic diagram of the driving component of the present invention.

[0030] Figure 7 This is a schematic diagram of the structure of the first large sieve plate and the small sieve plate of the present invention.

[0031] Reference numerals in the attached drawings: 1-Box body; 2-Arc-shaped channel; 3-Screening chamber; 4-First large screen plate; 5-Small screen plate; 6-Top discharge port; 7-Side discharge port; 8-Hopper; 8.1-Bottom plate; 8.2-Side plate; 8.3-First outer arc plate; 8.4-Second outer arc plate; 8.5-Inner arc plate; 9-Second large screen plate; 10-Upper cavity; 11-Lower cavity; 12-Discharge port; 13-Swing arm; 14-Power unit ; 15-Inlet; 16-Upper outlet; 17-Lower outlet; 18-Third large screen plate; 19-Rolling channel; 20-Support block; 21-Top block; 22-Stop block; 23-Drive assembly; 23.1-Lifting plate; 23.2-First rotating rod; 23.3-Second rotating rod; 23.4-Transverse track; 23.5-Third rotating rod; 23.6-Guide groove; 24-Pull-out groove; 25-Upper door body; 26-Lower door body. Detailed Implementation

[0032] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the present invention will be described below by way of example; however, all descriptions should not be construed as limiting the present invention in any way.

[0033] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, the present invention still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, and thus these further embodiments according to the present invention should also be considered within the scope of this description.

[0034] It should also be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0035] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0036] like Figures 1 to 7 As shown, a coal gangue screening device includes:

[0037] The box 1 has a fan-shaped structure. Inside the box 1, there is an arc-shaped channel 2. Below the top of the arc-shaped channel 2, there is a vertical screening chamber 3.

[0038] The first large screen plate 4 and the small screen plate 5 are arranged vertically in the screening chamber 3. The top and side of the screening chamber 3 are connected to the arc-shaped channel 2 through the top discharge port 6 and the side discharge port 7, respectively. The side discharge port 7 is located between the first large screen plate 4 and the small screen plate 5, and the end of the first large screen plate 4 and the small screen plate 5 away from the side discharge port 7 is inclined downward.

[0039] The hopper 8 is slidably disposed in the arc-shaped channel 2, and the four sides of the hopper 8 are respectively attached to the arc-shaped channel 2. The inner cavity of the hopper 8 is divided into an upper cavity 10 and a lower cavity 11 by a second large screen plate 9. The lower cavity 11 has a discharge port 12 on the right side for connecting to the side discharge port 7.

[0040] The swing arm 13 has its outer end rotatably connected to the side of the hopper 8 and its inner end connected to the power component 14. The swing arm 13 is used to drive the hopper 8 to move between the top and bottom of the arc-shaped channel 2. When the hopper 8 is at the top of the arc-shaped channel 2, the discharge port 12 is located in the top discharge port 6.

[0041] An inlet 15 is provided on the outer wall of the arc-shaped channel 2. An upper outlet 16 and a lower outlet 17 are respectively provided on the side wall of the screening chamber 3 away from the inlet 15. The coal gangue on the first large screen plate 4 and the small screen plate 5 are discharged from the upper outlet 16 and the lower outlet 17, respectively. An upper door body 25 and a lower door body 26 are respectively provided in the upper outlet 16 and the lower outlet 17, and the top ends of the upper door body 25 and the lower door body 26 are rotatably connected to the upper outlet 16 and the lower outlet 17, respectively.

[0042] By setting up a second large screen plate 9, an upper cavity 10 and a lower cavity 11, the coal gangue entering the box 1 from the feed inlet 15 is screened by the second large screen plate when it enters the hopper 8. Coal gangue of different sizes will fall into the lower cavity 11, while large coal gangue will be retained in the large cavity.

[0043] The power component 14 drives the swing arm 13 to swing upwards, moving the housing 1 from the bottom to the top of the arc-shaped channel 2. During the movement of the housing 1, when the discharge port 12 is connected to the side discharge port 7, small-sized coal gangue located in the lower cavity 11 will roll onto the small screen plate through the side discharge port 7. The coal gangue is secondary-screened as it moves on the small screen plate 5 towards the lower discharge port 17. The coal gangue on the small screen plate 5 is finally discharged from the lower discharge port 17 and exits the housing 1. The power component can be a rotary motor or other device capable of driving the swing arm to swing up and down; this is prior art and will not be described in detail here.

[0044] The inner wall of the arc-shaped channel 2 facing inward is in contact with the discharge port 12, which can prevent coal gangue in the lower cavity 11 from falling into the arc-shaped channel 2 during the movement of the hopper 8 in the arc-shaped channel 2.

[0045] When the hopper 8 moves to the top of the arc-shaped channel 2, the coal gangue in the upper cavity 10 detaches from the top opening of the hopper 8 and falls onto the first large screen plate 4 through the top discharge port 6. At this time, as the coal gangue rolls on the first large screen plate 4 towards the upper discharge port 16, the first large screen plate 4 performs secondary screening of the coal gangue. A portion of the coal gangue falls onto the small screen plate 5 and is further screened. In this way, multiple screenings of the coal gangue are achieved.

[0046] In addition, when the hopper 8 is at the top of the arc-shaped channel 2, the discharge port 12 is connected to the top discharge port 6, so that the coal gangue remaining in the lower cavity 11 will fall onto the first large screen plate 4, and after screening, it will fall onto the small screen plate 5 for further screening.

[0047] like Figures 2 to 5 As shown, the hopper 8 includes a bottom plate 8.1, side plates 8.2 fixedly disposed on the front and rear sides of the bottom plate 8.1, a first outer arc plate 8.3 fixedly disposed between the outer end of the bottom plate 8.1 and the two side plates 8.2, a second outer arc plate 8.4 disposed on the top of the lower outer arc plate, and an inner arc plate 8.5 disposed above the discharge port 12. The first outer arc plate 8.3 and the second outer arc plate 8.4 are both attached to the inner wall surface of the arc channel 2 corresponding to the feed port 15. The inner arc plate 8.5 is attached to the inner wall surface of the arc channel 2 corresponding to the side feed port 7. The outer end of the second large screen plate 9 is fixedly connected to the bottom of the second outer arc plate 8.4.

[0048] When the hopper 8 is located at the bottom of the arc-shaped channel 2, the bottom plate 8.1 is in a state where the outer end is inclined downward. The second large screen plate 9 is parallel to the bottom plate 8.1. A third large screen plate 18 with the inner end inclined downward is provided above the second large screen plate 9. A rolling channel 19 for coal gangue to roll down is formed between the inner end of the third large screen plate 18 and the second large screen plate 9.

[0049] By setting up a third large screen plate 18 and a rolling channel 19, the coal gangue falling into the hopper 8 from the feed inlet 15 will roll sequentially on the third large screen plate 18 and the second large screen plate 9, improving the pre-screening effect of the hopper 8. At the same time, the coal gangue located in the upper cavity 10 after screening will be concentrated at the outer end of the upper cavity 10 and away from the rolling channel 19 to ensure sufficient screening stroke and improve the pre-screening effect of the hopper 8.

[0050] like Figure 3 and Figure 5 As shown, the bottom end of the inner arc plate 8.5 is rotatably connected to the side plate 8.2, the outer end of the third large sieve plate 18 is rotatably connected to the top end of the second outer arc plate 8.4, and a support block 20 is fixedly provided on the top end of the inner side of the second outer arc plate 8.4, which is supported on the outer end of the lower surface of the third large sieve plate 18.

[0051] When the hopper 8 is at the bottom of the arc-shaped channel 2, the support block 20 is supported on the outer end of the lower surface of the third perforated plate. Under its own weight and the pressure of the coal gangue, the third large perforated plate 18 is in a stable state. The second outer arc plate 8.4 is stably pressed on the top of the first outer arc plate 8.3, so that during the upward movement of the hopper 8 in the arc-shaped channel 2, the upper cavity 10 and the lower cavity 11 are in a stable closed state, ensuring the conveying effect of the hopper 8 on the coal gangue.

[0052] When the hopper 8 is at the top of the arc-shaped channel 2, the coal gangue in the upper cavity 10 automatically slides down and presses down on the inner arc-shaped plate 8.5, causing the inner arc-shaped plate 8.5 to open downward. At this time, the inner arc-shaped plate 8.5 moves away from the third large screen plate 18, and the coal gangue in the upper cavity 10 rolls down from the rolling channel 19 onto the first large screen plate 4.

[0053] During the downward opening of the inner arc plate 8.5, the bottom of the third large screen plate 18 deflects away from the second large screen plate 9 under its own gravity, with its top as the center, further expanding the size of the rolling channel 19 and improving the efficiency of coal gangue detaching from the upper cavity 10.

[0054] like Figure 3 and Figure 5 As shown, the inner end of the second large sieve plate 9 is rotatably connected to the bottom end of the inner arc plate 8.5. The bottom end of the inner arc plate 8.5 is provided with a top block 21. When the inner arc plate 8.5 is opened, the top block 21 pushes the second large sieve plate 9, the second outer arc plate 8.4 and the third large sieve plate 18 to rotate as a whole.

[0055] When the hopper 8 is at the top of the arc-shaped channel 2, the inner arc-shaped plate 8.5 opens downward under the pressure of the coal gangue in the upper cavity 10. The top block 21 causes the second large screen plate 9 to swing in the direction of the upper cavity 10. During the swing, the coal gangue piled on top of the inner arc-shaped plate 8.5 is pushed towards the upper surface of the first large screen plate 4 toward the upper discharge port 16. This allows the coal gangue in the upper cavity 10 to fall more efficiently and evenly to the top of the first large screen plate 4, preventing the coal gangue in the upper cavity 10 from accumulating in the area of ​​the first large screen plate 4 near the inner arc-shaped plate 8.5, thus improving the screening efficiency of the coal gangue.

[0056] When the bottom end of the inner arc plate 8.5 enters the top discharge port 6, the end of the inner arc plate 8.5 away from the second large screen plate 9 is supported on the upper surface of the first large screen plate 4 and is located on the side of the first large screen plate 4 with its rotation axis facing the upper discharge port 16.

[0057] This configuration allows the open inner arc plate 8.5 to block and limit the coal gangue falling from the upper cavity 10 onto the first large screen plate 4, preventing it from rolling to one side of the arc channel 2. At the same time, it ensures that a certain amount of coal gangue accumulates on the inner arc plate 8.5. The pressure of the coal gangue keeps the inner arc plate 8.5 in an open state, and the top block 21 stabilizes the second large screen plate 9, the second outer arc plate 8.4, and the third large screen plate 18 in a swinging state, thereby ensuring that the rolling channel 19 is in its most open state, ensuring that the coal gangue can completely, quickly, and efficiently detach from the upper cavity 10.

[0058] Furthermore, when the residual coal gangue in the lower cavity 11 falls onto the first large screen plate 4, it is located on the side of the inner arc plate 8.5 away from the upper discharge port 16. Thus, the inner arc plate 8.5 separates the coal gangue falling from the upper cavity 10 and the lower cavity 11 onto the first large screen plate 4, preventing the mixing of coal gangue of two sizes and improving screening efficiency.

[0059] A stop block 22 is provided on the side wall of the upper cavity 10. The stop block 22 is used to restrict the outer end of the second large sieve plate 9 within the plate surface range of the side plate 8.2 when the second large sieve plate 9 rotates with the inner arc plate 8.5. By providing the stop block 22, excessive swinging of the second large sieve plate 9 and the second outer arc plate 8.4 can be prevented.

[0060] like Figure 2 As shown, the first large sieve plate 4 and the small sieve plate 5 are rotatably installed in the screening chamber 3. A drive assembly 23 is provided between the first large sieve plate 4 and the small sieve plate 5 on one side near the arc-shaped channel 2. One end of the drive assembly 23 is connected to the swing arm 13. When the swing arm 13 swings, the drive assembly 23 drives the first large sieve plate 4 and the small sieve plate 5 to swing.

[0061] The vibration of the first large screen plate 4 and the small screen plate 5 enables the vibration screening of coal gangue located in the screening chamber 3, thereby improving the screening effect and enhancing the discharge performance of coal gangue.

[0062] Meanwhile, during the vibration of the first large screen plate 4, the inner arc plate 8.5 will be pushed to swing up and down. In a relatively specific embodiment, when the hopper 8 is at the extreme position at the top of the arc channel 2, the edge of the discharge port 12 facing the feed port 15 is flush with the top discharge channel, and at this time, the top of the second large screen plate 9 is tilted towards the feed port 15, so that the second large screen plate 9 can stably maintain the second outer arc plate 8.4 supported on the first outer arc plate 8.3 under its own weight.

[0063] Furthermore, during the upward swing of the inner arc plate 8.5, the coal gangue accumulated at the corner between its upper surface and the second large screen plate 9, along with the weight of the second large screen plate 9 itself, causes the second large screen plate 9 and the second outer arc plate 8.4 to swing and reset towards the lower cavity 11. Then, during the downward swing of the inner arc plate 8.5, the top block 21 drives the second large screen plate 9 and the second outer arc plate 8.4 to swing again towards the upper cavity 10. Thus, by utilizing the reciprocating swing process in conjunction with the vibration process of the first large screen plate 4, the reciprocating vibration of the second large screen plate 9 and the second outer arc plate 8.4 is achieved, further improving the coal gangue removal effect. At the same time, the vibration process effectively removes the coal gangue stuck in the screen holes of the second large screen plate 9 and the third large screen plate 18.

[0064] like Figure 2 , Figure 6 and Figure 7 As shown, the drive assembly 23 includes a lifting plate 23.1, a first rotating rod 23.2, a second rotating rod 23.3, a transverse track 23.4, a third rotating rod 23.5, and a guide groove 23.6. The sides of the first large sieve plate 4 and the small sieve plate 5 are provided with strip-shaped grooves on the side facing the lateral channel at the axis of rotation. The first rotating rod 23.2 is slidably disposed within the strip-shaped grooves, and the outer end of the first rotating rod 23.2 is rotatably mounted on the lifting plate 23.1. Transverse tracks 23.4 are slidably disposed on both sides of the housing 1. The transverse tracks 23.4 are wavy in shape. The second rotating rod 23.3 is slidably disposed on the transverse track 23.6. The second rotating rod 23.3 is rotatably mounted on the bottom end of the lifting plate 23.1, and the third rotating rod 23.5 is rotatably mounted on the outer surface of the transverse track 23.4. The guide groove 23.6 is set on the swing arm 13, and the third rotating rod 23.5 is slidably set in the guide groove 23.6. When the swing arm 13 swings upward, the guide groove 23.6 pushes the transverse track 23.4 to move away from the arc track through the third rotating rod 23.5. When the swing arm 13 swings downward, the guide groove 23.6 pushes the transverse track 23.4 to move away from the arc track through the third rotating rod 23.5.

[0065] During the upward swing of the swing arm 13, the third rotating rod 23.5 moves within the guide groove 23.6 while simultaneously driving the transverse track 23.4 to move laterally. At this time, the second rotating rod 23.3 moves within the transverse track 23.4, passing through the crests and troughs of the track in sequence, thereby driving the lifting plate 23.1 to move up and down. The lifting plate 23.1, through the first rotating rod 23.2 and the strip groove, drives the first large screen plate 4 and the small screen plate 5 to swing up and down, thereby achieving the reciprocating vibration of the first large screen plate 4 and the small screen plate 5, thus realizing vibrating screening.

[0066] like Figure 2As shown, a pull-out groove 24 is provided at the bottom of the screening chamber 3. The pull-out groove 24 is used to collect coal ash and other small coal gangue particles that fall from the first large screen plate 4 and the small screen plate 5. The lateral feed port 7 is inclined downwards towards the end of the screening chamber 3, and the inclination angle of the lateral feed port 7 is greater than the inclination angle of the first large screen plate 4 and the small screen plate 5.

[0067] The technical scope of this invention is not limited to the contents of the above specification. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the scope of this invention.

Claims

1. A coal gangue screening device, characterized in that, include: The box (1) has a fan-shaped structure. An arc-shaped channel (2) is provided inside the box (1). A vertical screening chamber (3) is provided below the top of the arc-shaped channel (2). The first large sieve plate (4) and the small sieve plate (5) are arranged vertically in the screening chamber (3). The top and side of the screening chamber (3) are connected to the arc-shaped channel (2) through the top discharge port (6) and the side discharge port (7), respectively. The side discharge port (7) is located between the first large sieve plate (4) and the small sieve plate (5), and the end of the first large sieve plate (4) and the small sieve plate (5) away from the side discharge port (7) is inclined downward. The hopper (8) is slidably disposed in the arc-shaped channel (2), and the four sides of the hopper (8) are respectively attached to the arc-shaped channel (2). The inner cavity of the hopper (8) is divided into an upper cavity (10) and a lower cavity (11) by a second large screen plate (9). The lower cavity (11) has a discharge port (12) on the right side for connecting to the side discharge port (7). The swing arm (13) is rotatably connected to the side of the hopper (8) at its outer end and connected to the power component (14) at its inner end. The swing arm (13) is used to drive the hopper (8) to move between the top and bottom of the arc channel (2). When the hopper (8) is located at the top of the arc channel (2), the discharge port (12) is located in the top discharge port (6). The outer wall of the arc-shaped channel (2) is provided with a feed inlet (15), and the side wall of the screening chamber (3) away from the feed inlet (15) is provided with an upper discharge outlet (16) and a lower discharge outlet (17). The coal gangue on the first large screen plate (4) and the small screen plate (5) are discharged from the upper discharge outlet (16) and the lower discharge outlet (17) respectively.

2. The coal gangue screening device as described in claim 1, characterized in that, The hopper (8) includes a bottom plate (8.1), side plates (8.2) fixedly disposed on the front and rear sides of the bottom plate (8.1), a first outer arc plate (8.3) fixedly disposed between the outer end of the bottom plate (8.1) and the two side plates (8.2), a second outer arc plate (8.4) disposed on the top of the lower outer arc plate, and an inner arc plate (8.5) disposed above the discharge port (12). The first outer arc plate (8.3) and the second outer arc plate (8.4) are both in contact with the inner wall of the arc channel (2) corresponding to the feed port (15). The inner arc plate (8.5) is in contact with the inner wall of the arc channel (2) corresponding to the side feed port (7). The outer end of the second large screen plate (9) is fixedly connected to the bottom of the second outer arc plate (8.4).

3. The coal gangue screening device as described in claim 2, characterized in that, When the hopper (8) is located at the bottom of the arc-shaped channel (2), the bottom plate (8.1) is in a state where the outer end is inclined downward. The second large screen plate (9) is parallel to the bottom plate (8.1). A third large screen plate (18) with the inner end inclined downward is provided above the second large screen plate (9). A rolling channel (19) for coal gangue to roll down is formed between the inner end of the third large screen plate (18) and the second large screen plate (9).

4. The coal gangue screening device as described in claim 3, characterized in that, The bottom end of the inner arc plate (8.5) is rotatably connected to the side plate (8.2), the outer end of the third large sieve plate (18) is rotatably connected to the top end of the second outer arc plate (8.4), and a support block (20) supporting the outer end of the lower surface of the third large sieve plate (18) is fixedly provided on the top end of the inner side of the second outer arc plate (8.4).

5. The coal gangue screening device as described in claim 4, characterized in that, The inner end of the second large sieve plate (9) is rotatably connected to the bottom end of the inner arc plate (8.5). The bottom end of the inner arc plate (8.5) is provided with a top block (21). When the inner arc plate (8.5) is opened, the top block (21) pushes the second large sieve plate (9), the second outer arc plate (8.4) and the third large sieve plate (18) to rotate as a whole.

6. The coal gangue screening device as described in claim 5, characterized in that, When the bottom end of the inner arc plate (8.5) enters the top discharge port (6), the end of the inner arc plate (8.5) away from the second large screen plate (9) is supported on the upper surface of the first large screen plate (4) and is located on the side of the first large screen plate (4) with its rotation axis facing the upper discharge port (16).

7. A coal gangue screening device as described in claim 6, characterized in that, A stop (22) is provided on the side wall of the upper cavity (10). The stop (22) is used to restrict the outer end of the second large sieve plate (9) within the plate surface range of the side plate (8.2) when the second large sieve plate (9) rotates with the inner arc plate (8.5).

8. The coal gangue screening device as described in claim 5, characterized in that, The first large sieve plate (4) and the small sieve plate (5) are rotatably installed in the sieving chamber (3). A driving assembly (23) is provided between the first large sieve plate (4) and the small sieve plate (5) near the side end of the arc-shaped channel (2). One end of the driving assembly (23) is connected to the swing arm (13). When the swing arm (13) swings, the driving assembly (23) drives the first large sieve plate (4) and the small sieve plate (5) to swing.

9. A coal gangue screening device as described in claim 8, characterized in that, The drive assembly (23) includes a lifting plate (23.1), a first rotating rod (23.2), a second rotating rod (23.3), a transverse track (23.4), a third rotating rod (23.5), and a guide groove (23.6). The sides of the first large sieve plate (4) and the small sieve plate (5) are provided with strip-shaped grooves on the side facing the lateral channel from the axis of rotation. The first rotating rod (23.2) is slidably disposed within the strip-shaped grooves, and the outer end of the first rotating rod (23.2) is rotatably mounted on the lifting plate (23.1). Transverse tracks (23.4) are slidably disposed on both sides of the housing (1). The transverse tracks (23.4) are wavy. The second rotating rod (23.3) is slidably disposed on the transverse track (23.1). Inside 23.4), the second rotating rod (23.3) is rotatably mounted on the bottom end of the lifting plate (23.1), the third rotating rod (23.5) is rotatably mounted on the outer side of the transverse track (23.4), the guide groove (23.6) is set on the swing arm (13), and the third rotating rod (23.5) is slidably set in the guide groove (23.6). When the swing arm (13) swings upward, the guide groove (23.6) pushes the transverse track (23.4) to move away from the arc track through the third rotating rod (23.5). When the swing arm (13) swings downward, the guide groove (23.6) pushes the transverse track (23.4) to move away from the arc track through the third rotating rod (23.5).

10. A coal gangue screening device as described in claim 1, characterized in that, The bottom end of the screening chamber (3) is provided with a pull groove (24), and the side feed port (7) is inclined downward toward the end of the screening chamber (3), and the inclination angle of the side feed port (7) is greater than the inclination angle of the first large screen plate (4) and the small screen plate (5).

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