Coal gangue screening device

Abstract

The invention relates to the technical field of coal gangue screening, in particular to a coal gangue screening device which comprises a box body, an arc-shaped channel is formed in the box body, and a screening cavity in a vertical state is formed below the top of the arc-shaped channel; the first large sieve pore plate and the small sieve pore plate are arranged in the sieving cavity in an up-and-down distribution mode, and the top end and the side face of the sieving cavity communicate with the arc-shaped channel through the top discharging opening and the lateral discharging opening correspondingly; the hopper is arranged in the arc-shaped channel in a sliding mode, an inner cavity of the hopper is divided into an upper cavity body and a lower cavity body by arranging a second large sieve pore plate, and a discharging opening used for being communicated with the lateral discharging opening is formed in the right side of the lower cavity body; the outer side end of the swing arm is rotationally connected to the side face of the hopper, and the inner side end is connected with a power component. Through the pre-screening effect of the hopper, classified screening of the first large sieve pore plate and the small sieve pore plate and classified feeding of the hopper to the first large sieve pore plate and the small sieve pore plate, classified screening is achieved, and the screening efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal gangue screening; in particular, the invention relates to a coal gangue screening device. Background Art

[0002] Gangue is solid waste discharged during the coal mining and coal washing process. It is a kind of black-gray rock with low carbon content and harder than coal that accompanies the coal seam during the coal formation process. In order to avoid the waste of resources caused by uneven particle size and make more comprehensive development and utilization of gangue resources, it is necessary to use a gangue screening device to separate the crushed gangue according to particle size so that gangue of different particle sizes can be fully utilized.

[0003] For example, a filtering device and filtering method for gangue treatment with publication number CN 118142858 A is provided with a pushing assembly, a sleeve lifting block and an inner box body rising, thereby realizing up and down shaking filtering of the inner box body. At the same time, when the inner box body rises, the inner box body drives the pushing block to move, and the fixed rod limits the pushing block, so that the pushing block rises vertically. The rising pushing block is squeezed by the inclined surface of the inclined block, so that the inner box body also shakes in the horizontal direction. Compared with only shaking left and right, the filtering effect of the gangue is improved.

[0004] However, the filtering device only uses 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. Some large coal gangue has a poor disturbance effect and will block the sieve holes, affecting the screening efficiency.

[0005] In view of this, the present 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, so as to solve or at least alleviate one or more of the above-mentioned problems and other problems existing in the prior art.

[0007] In order to achieve the above-mentioned object, the present invention provides a coal gangue screening device, comprising:

[0008] The box body is in a fan-shaped structure, an arc-shaped channel is arranged inside the box body, and a vertical screening cavity is arranged below the top of the arc-shaped channel;

[0009] The first large sieve plate and the small sieve plate are arranged in the screening chamber in an upper and lower distribution, and the top and side of the screening chamber are respectively connected with the arc-shaped channel through the top feed opening and the side feed opening, and the side feed opening is located between the first large sieve plate and the small sieve plate, and the first large sieve plate and the small sieve plate are inclined downward at one end away from the side feed opening;

[0010] The hopper is slidably arranged in the arc-shaped channel, and the four sides of the hopper are respectively in contact with the arc-shaped channel. The inner cavity of the hopper is divided into an upper cavity and a lower cavity by arranging a second large sieve hole plate. A discharge port for communicating with the side discharge port is arranged on the right side of the lower cavity;

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

[0012] An inlet is arranged on the outer side wall of the arc-shaped channel. Upper discharge ports and lower discharge ports are respectively arranged on the side wall of the screening cavity far from the inlet. The gangue on the first large sieve hole plate and the small sieve hole plate are respectively discharged from the upper discharge port and the lower discharge port.

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

[0014] In the gangue screening device as 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 sieve hole plate is parallel to the bottom plate. A third large sieve hole plate with the inner end inclined downward is arranged above the second large sieve hole plate. A rolling channel for the gangue to roll is formed between the inner end of the third large sieve hole plate and the second large sieve hole plate.

[0015] In the gangue screening device as described above, optionally, the bottom end of the side surface of the inner arc plate is rotatably connected to the side plate. The outer end of the third large sieve hole plate is rotatably connected to the top end of the second outer arc plate. And a support block for supporting the outer end of the lower surface of the third large sieve hole plate is fixedly arranged at the top end of the inner side surface of the second outer arc plate.

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

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

[0018] In the coal gangue screening device as described above, optionally, a stop block is provided on the side wall of the upper cavity, and the stop block is used to limit the outer end of the second large sieve hole plate within the range of the side plate surface when the second large sieve hole plate rotates following the inner arc plate.

[0019] In the coal gangue screening device as described above, optionally, both the first large sieve hole plate and the small sieve hole plate are rotatably installed in the screening cavity. A driving component is provided between the side ends of the first large sieve hole plate and the small sieve hole plate close to 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 sieve hole plate and the small sieve hole plate to swing.

[0020] In the coal gangue screening device as described above, optionally, the driving component includes a lifting plate, a first rotating rod, a second rotating rod, a transverse movement track, a third rotating rod, and a guiding groove. Strip-shaped grooves are formed on the sides of the first large sieve hole plate and the small sieve hole plate where the rotation axis faces the side channel. The first rotating rod is slidably arranged in the strip-shaped groove, and the outer end of the first rotating rod is rotatably installed on the lifting plate. Transverse movement tracks are slidably arranged on both side walls of the box body. The transverse movement tracks are arranged in a wavy shape. The second rotating rod is slidably arranged in the transverse movement track, and the second rotating rod is rotatably installed at the bottom end of the lifting plate. The third rotating rod is rotatably installed on the outer side surface of the transverse movement track. The guiding groove is arranged on the swing arm, and the third rotating rod is slidably arranged in the guiding groove. When the swing arm swings upward, the guiding groove pushes the transverse movement track to displace away from the arc-shaped track through the third rotating rod. When the swing arm swings downward, the guiding groove pushes the transverse movement track to displace towards the arc-shaped track through the third rotating rod.

[0021] In the coal gangue screening device as described above, optionally, a pull-out groove is provided at the bottom end of the screening cavity. The side downward feeding port is in a state of inclining downward towards the screening cavity at one end, and the inclination angle of the side downward feeding port is greater than the inclination angles of the first large sieve hole plate and the small sieve hole plate.

[0022] The coal gangue screening device of the present invention uses a hopper to displace within an arc-shaped channel, and the pre-screening effect of the hopper combined with the secondary screening effects of the first large-screen hole plate and the small-screen hole plate can achieve the effects of multiple screening and classified screening of coal gangue, improving the screening efficiency of coal gangue. Moreover, during the process of the hopper moving to the top of the arc-shaped channel for discharging, by utilizing the driving effect of the inner arc-shaped plate on the second large-screen hole plate, the second outer arc-shaped plate, and the third large-screen hole plate under the action of the gravity of the coal gangue, it can be realized that the coal gangue falling into the upper cavity and the lower cavity is separated on the first large-screen hole plate, and the discharging efficiency of the hopper is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Referring to the accompanying drawings, the disclosure of the present invention will become more apparent. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the figures:

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

[0025] Figure 2 is of the present invention Figure 1 a cross-sectional view.

[0026] Figure 3 is of the present invention Figure 2 a schematic diagram of the hopper in it.

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

[0028] Figure 5 is of the present invention Figure 4 a disassembled schematic diagram of the hopper in it.

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

[0030] Figure 7 is a schematic structural diagram of the first large-screen hole plate and the small-screen hole plate of the present invention.

[0031] Reference numerals: 1 - box body; 2 - arc-shaped channel; 3 - screening chamber; 4 - first large sieve hole plate; 5 - small sieve hole plate; 6 - top feeding port; 7 - side feeding port; 8 - hopper; 8.1 - bottom plate; 8.2 - side plate; 8.3 - first outer arc-shaped plate; 8.4 - second outer arc-shaped plate; 8.5 - inner arc-shaped plate; 9 - second large sieve hole plate; 10 - upper cavity; 11 - lower cavity; 12 - discharge port; 13 - swing arm; 14 - power component; 15 - feeding port; 16 - upper discharge port; 17 - lower discharge port; 18 - third large sieve hole 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 moving track; 23.5 - third rotating rod; 23.6 - guiding groove; 24 - pulling slot; 25 - upper door body; 26 - lower door body. Detailed implementation manners

[0032] With reference to the accompanying drawings and specific embodiments, the structure, composition, features, advantages, etc. of the... of the present invention will be described by way of example below. However, all descriptions should not be used to form any limitation to the present invention.

[0033] In addition, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the respective drawings, the present invention still allows any combination or deletion to continue between these technical features (or their equivalents) without any technical obstacle. Therefore, it should be considered that these more embodiments according to the present invention are also within the scope of the present disclosure.

[0034] It should also be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, that is,... It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present disclosure.

[0035] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one such feature.

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

[0037] A box body 1, which is in a fan-shaped structure. An arc-shaped channel 2 is arranged inside the box body 1, and a vertically arranged screening chamber 3 is arranged below the top of the arc-shaped channel 2;

[0038] 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 respectively communicated with the arc-shaped channel 2 through the top feeding port 6 and the side feeding port 7. The side feeding port 7 is located between the first large sieve plate 4 and the small sieve plate 5, and one end of the first large sieve plate 4 and the small sieve plate 5 away from the side feeding port 7 inclines downward.

[0039] The hopper 8 is slidably arranged 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 arranging the second large sieve plate 9. A discharge port 12 for communicating with the side feeding port 7 is arranged on the right side of the lower cavity 11.

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

[0041] An inlet port 15 is arranged on the outer wall of the arc-shaped channel 2. Upper discharge ports 16 and lower discharge ports 17 are respectively arranged on a side wall of the screening chamber 3 away from the inlet port 15. The coal gangue on the first large sieve plate 4 and the small sieve plate 5 are respectively discharged from the upper discharge port 16 and the lower discharge port 17. Upper door bodies 25 and lower door bodies 26 are respectively arranged in the upper discharge port 16 and the lower discharge port 17, and the tops of the upper door bodies 25 and the lower door bodies 26 are respectively rotatably connected in the upper discharge port 16 and the lower discharge port 17.

[0042] By arranging the second large sieve plate 9, the upper cavity 10 and the lower cavity 11, when the coal gangue entering the box body 1 from the inlet port 15 enters the hopper 8, it is screened by the second large sieve plate. The coal gangue with small and large sizes will fall into the lower cavity 11, and the coal gangue with large sizes is intercepted in the upper cavity.

[0043] The power component 14 drives the swing arm 13 to swing upward, driving the box body 1 to move from the bottom end to the top end of the arc-shaped channel 2. During the movement of the box body 1, when the discharge port 12 is in a communicating state with the side feeding port 7, the small-sized coal gangue in the lower cavity 11 will roll through the side feeding port 7 to the small sieve plate. During the process of the coal gangue displacing towards the lower discharge port 17 on the small sieve plate 5, it is secondarily screened. The coal gangue on the small sieve plate 5 finally discharges from the lower discharge port 17 out of the box body 1. The power component can be a rotary motor or other devices capable of driving the swing arm to swing up and down. This is the prior art and will not be elaborated here.

[0044] The inner wall surface of the arc-shaped channel 2 facing inward can prevent the 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 by fitting with the discharge port 12.

[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 through the top discharge opening 6 onto the first large sieve plate 4. At this time, during the process of the coal gangue rolling towards the upper discharge opening 16 on the first large sieve plate 4, the first large sieve plate 4 performs secondary screening on the coal gangue. A part of the coal gangue falls onto the small sieve 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 located at the top of the arc-shaped channel 2, the discharge opening 12 is communicated with the top discharge opening 6, so that the coal gangue remaining in the lower cavity 11 will fall onto the first large sieve plate 4 and, after being screened, fall onto the small sieve plate 5 and is screened again.

[0047] As Figures 2 to 5 shown, the hopper 8 includes a bottom plate 8.1, side plates 8.2 fixedly arranged on the front and rear sides of the bottom plate 8.1, a first outer arc plate 8.3 fixedly arranged between the outer end of the bottom plate 8.1 and the two side plates 8.2, a second outer arc plate 8.4 arranged on the top of the lower outer arc plate, and an inner arc plate 8.5 arranged above the discharge opening 12. The first outer arc plate 8.3 and the second outer arc plate 8.4 are both in contact with the inner wall surface of the arc-shaped channel 2 corresponding to the feed opening 15, and the inner arc plate 8.5 is in contact with the inner wall surface of the arc-shaped channel 2 corresponding to the side discharge opening 7. The outer end of the second large sieve 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 sieve plate 9 is parallel to the bottom plate 8.1. Above the second large sieve plate 9, there is a third large sieve plate 18 with the inner end inclined downward. A rolling channel 19 for the coal gangue to roll down is formed between the inner end of the third large sieve plate 18 and the second large sieve plate 9.

[0049] By providing the third large sieve plate 18 and the rolling channel 19, the coal gangue falling into the hopper 8 from the feed opening 15 will roll on the third large sieve plate 18 and the second large sieve plate 9 in sequence, improving the pre-screening effect of the hopper 8. At the same time, the coal gangue 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] As Figure 3 and Figure 5 shown, the bottom end of the side surface 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 arranged at the top end of the inner side surface of the second outer arc plate 8.4.

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

[0052] When the hopper 8 is at the top end of the arc-shaped channel 2, the coal gangue in the upper cavity 10 automatically slides down and presses down 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 is far from the third large sieve plate 18, and the coal gangue in the upper cavity 10 rolls from the rolling channel 19 onto the first large sieve plate 4.

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

[0054] As Figure 3 and Figure 5 shown, the inner end of the second large sieve plate 9 is rotatably connected to the bottom end of the inner arc-shaped plate 8.5. A top block 21 is arranged at the bottom end of the inner arc-shaped plate 8.5. When the inner arc-shaped plate 8.5 opens, the top block 21 pushes the second large sieve plate 9, the second outer arc-shaped plate 8.4 and the third large sieve plate 18 to rotate as a whole.

[0055] When the hopper 8 is at the top end of the arc-shaped channel 2 and the inner arc-shaped plate 8.5 is opened downward under the pressure of the coal gangue in the upper cavity 10, the second large sieve plate 9 swings towards the direction of the upper cavity 10 through the top block 21. During the swinging process, the coal gangue accumulated on the top of the inner arc-shaped plate 8.5 is pushed towards the direction of the upper discharge port 16 on the upper surface of the first large sieve plate 4, so that the coal gangue in the upper cavity 10 can fall onto the top of the first large sieve plate 4 more efficiently and evenly, preventing the coal gangue in the upper cavity 10 from concentrating and accumulating in the area of the first large sieve plate 4 near the inner arc-shaped plate 8.5 and improving the screening efficiency of coal gangue.

[0056] Wherein, when the bottom end of the inner arc-shaped plate 8.5 enters the top feed port 6, the end of the inner arc-shaped plate 8.5 far from the second large sieve plate 9 supports on the upper surface of the first large sieve plate 4 and is located on the side of the rotation axis of the first large sieve plate 4 facing the upper discharge port 16.

[0057] Such arrangement enables the opened inner arc plate 8.5 to block and limit the coal gangue falling from the upper cavity 10 onto the first large sieve plate 4, preventing it from rolling to one side of the arc channel 2. At the same time, a certain amount of coal gangue can be accumulated on the inner arc plate 8.5, and the pressure of the coal gangue is used to make the inner arc plate 8.5 open, and the inner arc plate 8.5 uses the top block 21 to stabilize the second large sieve plate 9, the second outer arc plate 8.4 and the third large sieve plate 18 in the state after swinging, thereby ensuring that the rolling channel 19 is in the maximum open state, ensuring that the coal gangue can be completely, quickly and efficiently separated from the upper cavity 10.

[0058] In addition, when the residual coal gangue in the lower cavity 11 falls onto the first large sieve plate 4, it is located on the side of the inner arc plate 8.5 away from the upper discharge port 16. Then, the inner arc plate 8.5 is used to separate the coal gangue that falls from the upper cavity 10 and the lower cavity 11 onto the first large sieve plate 4, preventing the two sizes of coal gangue from mixing and improving the screening efficiency.

[0059] A stopper 22 is provided on the side wall of the upper cavity 10, and the stopper 22 is used to limit the outer end of the second largest sieve plate 9 within the plate surface range of the side plate 8.2 when the second largest sieve plate 9 rotates following the inner arc plate 8.5. By providing the stopper 22, the second largest sieve plate 9 and the second outer arc plate 8.4 can be prevented from swinging excessively.

[0060] like Figure 2 As shown, the first large sieve plate 4 and the small sieve plate 5 are both rotatably installed in the screening chamber 3, and a driving component 23 is arranged between one side end of the first large sieve plate 4 and the small sieve plate 5 close to the arc channel 2. One end of the driving component 23 is connected to the swing arm 13. When the swing arm 13 swings, the driving component 23 drives the first large sieve plate 4 and the small sieve plate 5 to swing.

[0061] Vibration screening of the coal gangue in the screening chamber 3 is achieved through the vibration of the first large-hole sieve plate 4 and the small-hole sieve plate 5, thereby improving the screening effect and enhancing the discharge performance of the coal gangue.

[0062] At the same time, during the vibration of the first large sieve 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 located 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 feed channel, and at this time, the top of the second large sieve plate 9 is tilted toward the feed port 15, so that the second large sieve plate 9 can stably keep the second outer arc plate 8.4 supported on the first outer arc plate 8.3 under the effect of its own eccentric weight.

[0063] Furthermore, during the upward swing of the inner arc-shaped plate 8.5, the gangue accumulated at the corner between its upper surface and the second largest sieve plate 9 and the self-weight of the second largest sieve plate 9 cause the second largest sieve plate 9 and the second outer arc-shaped plate 8.4 to swing downward towards the cavity 11 and reset. After that, during the downward swing of the inner arc-shaped plate 8.5, the top block 21 drives the second largest sieve plate 9 and the second outer arc-shaped plate 8.4 to swing upward again towards the direction of the upper cavity 10. Furthermore, by utilizing the reciprocating swing process in cooperation with the vibration process of the first largest sieve plate 4, the reciprocating vibration of the second largest sieve plate 9 and the second outer arc-shaped plate 8.4 is achieved, further improving the coal gangue discharging effect. At the same time, the vibration process is used to effectively remove the coal gangue stuck in the sieve holes of the second largest sieve plate 9 and the third largest sieve plate 18.

[0064] As Figure 2 , Figure 6 and Figure 7 shown, the driving assembly 23 includes a lifting plate 23.1, a first rotating rod 23.2, a second rotating rod 23.3, a transverse movement track 23.4, a third rotating rod 23.5 and a guiding groove 23.6. On the side of the first largest sieve plate 4 and the small sieve plate 5 where the rotation axis faces the side channel, a strip-shaped groove is provided. The first rotating rod 23.2 is slidably arranged in the strip-shaped groove, and the outer end of the first rotating rod 23.2 is rotatably installed on the lifting plate 23.1. The transverse movement tracks 23.4 are slidably arranged on both side walls of the box body 1. The transverse movement tracks 23.4 are arranged in a wave shape. The second rotating rod 23.3 is slidably arranged in the transverse movement track 23.4, and the second rotating rod 23.3 is rotatably installed at the bottom end of the lifting plate 23.1. The third rotating rod 23.5 is rotatably installed on the outer side surface of the transverse movement track 23.4. The guiding groove 23.6 is arranged on the swing arm 13, and the third rotating rod 23.5 is slidably arranged in the guiding groove 23.6. When the swing arm 13 swings upward, the guiding groove 23.6 pushes the transverse movement track 23.4 to displace towards the side away from the arc-shaped track through the third rotating rod 23.5. When the swing arm 13 swings downward, the guiding groove 23.6 pushes the transverse movement track 23.4 to displace towards the side of the arc-shaped track through the third rotating rod 23.5.

[0065] During the upward swing of the swing arm 13, while the third rotating rod 23.5 displaces in the guiding groove 23.6, it drives the transverse movement track 23.4 to move horizontally. At this time, during the displacement of the second rotating rod 23.3 in the transverse movement track 23.4, it successively passes through the wave crest and wave trough positions of the transverse movement track 23.4, driving the lifting plate 23.1 to perform lifting movement. At this time, the lifting plate 23.1 drives the first largest sieve plate 4 and the small sieve plate 5 to swing up and down through the first rotating rod 23.2 and the strip-shaped groove, thereby realizing the reciprocating vibration of the first largest sieve plate 4 and the small sieve plate 5 and achieving vibration screening.

[0066] As Figure 2As shown, a draw-out groove 24 is provided at the bottom end of the screening chamber 3. The draw-out groove 24 is used to collect the coal ash and other small particle coal gangue that fall from the first large sieve hole plate 4 and the small sieve hole plate 5. The side downward feeding port 7 is in a state of inclining downward towards one end of the screening chamber 3, and the inclination angle of the side downward feeding port 7 is greater than the inclination angles of the first large sieve hole plate 4 and the small sieve hole plate 5.

[0067] The technical scope of the present invention is not limited to the content in the above specification. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A coal gangue screening device, characterized in that: include: The box body (1) is of a fan-shaped structure, an arc-shaped channel (2) is arranged inside the box body (1), and a vertical screening chamber (3) is arranged below the top of the arc-shaped channel (2); The first large sieve plate (4) and the small sieve plate (5) are arranged in an upper and lower distribution in the screening chamber (3); the top and the side of the screening chamber (3) are respectively connected to the arc-shaped channel (2) through the top feed opening (6) and the side feed opening (7); the side feed opening (7) is located between the first large sieve plate (4) and the small sieve plate (5); and the ends of the first large sieve plate (4) and the small sieve plate (5) away from the side feed opening (7) are inclined downward; A hopper (8) is slidably disposed in the arc-shaped channel (2), and the four sides of the hopper (8) are respectively in contact with 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 providing a second large sieve plate (9). The right side of the lower cavity (11) is provided with a discharge port (12) for communicating with a lateral lower material port (7); A swing arm (13), the outer end of which is rotatably connected to the side of the hopper (8), and the inner end of which is connected to a power component (14), the swing arm (13) is used to drive the hopper (8) to move between the top end and the bottom end of the arc-shaped channel (2), and when the hopper (8) is located at the top end of the arc-shaped channel (2), the discharge port (12) is located in the top discharge port (6); A feed port (15) is provided on the outer side wall of the arc-shaped channel (2), an upper discharge port (16) and a lower discharge port (17) are respectively provided on a side wall of the screening chamber (3) away from the feed port (15), and the coal gangue on the first large sieve plate (4) and the small sieve plate (5) are discharged from the upper discharge port (16) and the lower discharge port (17) respectively.

2. A coal gangue screening device as claimed in claim 1, characterized in that: The hopper (8) comprises a bottom plate (8.1), side plates (8.2) fixedly arranged on the front and rear sides of the bottom plate (8.1), a first outer arc plate (8.3) fixedly arranged between the outer end of the bottom plate (8.1) and the two side plates (8.2), a second outer arc plate (8.4) arranged on the top of the lower outer arc plate, and an inner arc plate (8.5) arranged above the discharge port (12), the first outer arc plate (8.3) and the second outer arc plate (8.4) both fit with the inner wall surface of one side of the arc channel (2) corresponding to the feed port (15), the inner arc plate (8.5) fits with the inner wall surface of one side of the arc channel (2) corresponding to the lateral discharge port (7), and the outer end of the second large sieve plate (9) is fixedly connected to the bottom of the second outer arc plate (8.4).

3. A coal gangue screening device as claimed in claim 2, characterized in that: When the hopper (8) is located at the bottom end of the arc-shaped channel (2), the bottom plate (8.1) is in a state where the outer end thereof is tilted downward, the second large sieve plate (9) is parallel to the bottom plate (8.1), a third large sieve plate (18) whose inner end thereof is tilted downward is arranged above the second large sieve plate (9), and a rolling channel (19) for rolling down coal gangue is formed between the third large sieve plate (18) and the inner end of the second large sieve plate (9).

4. A coal gangue screening device as claimed in claim 3, characterized in that: The bottom end of the side surface 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) supported on 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 surface of the second outer arc plate (8.4).

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

6. A coal gangue screening device as claimed 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 sieve plate (9) is supported on the upper surface of the first large sieve plate (4) and is located on the side of the rotation axis of the first large sieve plate (4) facing the upper discharge port (16).

7. A coal gangue screening device as claimed in claim 6, characterized in that: A stopper (22) is provided on the side wall of the upper cavity (10), and the stopper (22) is used to limit 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 following the inner arc plate (8.5).

8. The coal gangue screening device according to claim 5, characterized in that: The first large sieve plate (4) and the small sieve plate (5) are both rotatably mounted in the screening chamber (3); a driving assembly (23) is provided between one end of the first large sieve plate (4) and the small sieve plate (5) close to 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 claimed in claim 8, characterized in that: The driving assembly (23) comprises 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 side surfaces of the first large sieve plate (4) and the small sieve plate (5) are provided with a strip groove on the side of the rotation axis facing the lateral channel; the first rotating rod (23.2) is slidably arranged in the strip groove, and the outer end of the first rotating rod (23.2) is rotatably mounted on the lifting plate (23.1); the two side walls of the box body (1) are slidably arranged with a transverse track (23.4), and the transverse track (23.4) is arranged in a wave shape; the second rotating rod (23.3) is slidably arranged on the transverse track ( The guide groove (23.6) is arranged on the swing arm (13), and the third swing rod (23.5) is slidably arranged 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 to a side away from the arc track through the third swing rod (23.5). When the swing arm (13) swings downward, the guide groove (23.6) pushes the transverse track (23.4) to move to a side of the arc track through the third swing rod (23.5).

10. The coal gangue screening device according to claim 1, characterized in that: A drawing groove (24) is provided at the bottom end of the screening chamber (3), and the lateral downward material opening (7) is inclined downward toward one end of the screening chamber (3), and the inclination angle of the lateral downward material opening (7) is greater than the inclination angles of the first large sieve plate (4) and the small sieve plate (5).

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