Coal conveying belt circulating screening device for thermal power plant

Abstract

The application discloses a circulating screening device for a coal conveying belt of a thermal power plant, and has the advantages that: firstly, the device realizes automatic processing of coal, from dumping, crushing, grinding to screening, and the whole process is completed through mechanical structures, greatly improving the processing efficiency and reducing the need for manual operation; secondly, the crushing and grinding structure can efficiently process coal of different particle sizes, so that the coal reaches a particle size suitable for further processing or combustion, thereby guaranteeing the stability and efficiency of boiler combustion; and thirdly, the screening structure is very ingenious, and can accurately separate coal according to size through Y-shaped screening blocks and rotary screening, thereby realizing fine processing of the coal.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a circulating screening device for coal conveyor belts in thermal power plants. Background Technology

[0002] In the operation of thermal power plants, conveyor belts play a crucial role, silently undertaking the task of transporting coal to ensure smooth combustion in the boiler. However, it is not difficult to find that these coals are not all of the same size. Some are in lumps of varying sizes; others are finely crushed and mixed with the lumps.

[0003] To improve boiler combustion efficiency, the processing of coal is crucial. Powdered coal, due to its fine particles, can mix more thoroughly with air and can therefore be directly fed into the boiler for combustion. Coal lumps, however, require crushing to achieve a suitable particle size to ensure stable and efficient combustion. While existing technologies may already address these issues, this invention aims to provide an alternative or replacement solution. Summary of the Invention

[0004] The technical solution of the present invention to achieve the above objectives is as follows: a circulating screening device for coal conveying belts in thermal power plants, comprising: three concave inclined conveyor blocks, a pair of belt conveyors, a Y-shaped screening block, a processing support, and a crushing and grinding box. The three concave inclined conveyor blocks are installed on the processing support, the Y-shaped screening block is connected to the three concave inclined conveyor blocks, the pair of belt conveyors are installed on the three concave inclined conveyor blocks, the crushing and grinding box is installed on the processing support, a screening structure is installed on the Y-shaped screening block, a circulating structure is installed on the concave inclined conveyor blocks and the crushing and grinding box, and a crushing and grinding structure is installed in the crushing and grinding box.

[0005] The screening structure includes: a feeding horn-shaped guide block, three arc-shaped limiting plates, a rotary drive motor, a rotary drive cylindrical block, several spiral-shaped rotary limiting blocks, several filter screens, several arc-shaped rotating blocks, several spiral-shaped horn-shaped rotating gathering blocks, a pair of arc-shaped screening plates, spiral-shaped guide blocks, L-shaped rotary discharge plates, rotary discharge shafts, a pair of arc-shaped rotating shaft tubes, a pair of arc-shaped rotating shaft rods, a pair of arc-shaped buffer sliders, and a pair of arc-shaped buffer springs;

[0006] The feeding horn-shaped guide block is installed on the concave inclined transport block; three arc-shaped limiting plates are inserted into the processing bracket and the Y-shaped screening block; the rotary drive is installed on the processing bracket; the rotary drive cylindrical block is installed on the drive end of the rotary drive, and the rotary drive cylindrical block is movably inserted into the inner side of the three arc-shaped limiting plates; several spiral-shaped rotary limiting blocks are inserted into the rotary drive cylindrical block; several filter screens are installed on several spiral-shaped rotary limiting blocks; several arc-shaped rotary blocks are respectively installed on several spiral-shaped rotary limiting blocks; several spiral-shaped horn-shaped rotary gathering blocks are respectively installed on the upper and lower ends of several spiral-shaped rotary limiting blocks; a pair of circular... An arc screening plate is mounted on three arc-shaped limiting plates; a spiral guide block is mounted on the Y-shaped screening block and the concave inclined transport block; an L-shaped rotary unloading plate is inserted into the spiral guide block via the rotary unloading shaft; a pair of arc-shaped rotating shaft tubes are inserted parallel to each other on the concave inclined transport block; a pair of arc-shaped rotating shaft rods are respectively movably inserted into the inner side of the pair of arc-shaped rotating shaft tubes; a pair of arc-shaped buffer sliders are respectively movably inserted into the inner side of the pair of arc-shaped rotating shaft tubes, and the pair of arc-shaped buffer sliders are respectively connected to the pair of arc-shaped rotating shaft rods; a pair of arc-shaped buffer springs are respectively mounted into the inner side of the pair of arc-shaped rotating shaft tubes, and the pair of arc-shaped buffer springs are respectively connected to the pair of arc-shaped buffer sliders.

[0007] It should be noted that, in the above process, coal is first poured into the inner side of the crushing and grinding box, where it is crushed and ground by the crushing and grinding structure. The crushed coal is then guided to a belt conveyor on a concave inclined conveyor block. This belt conveyor transports the coal to the inner side of a Y-shaped screening block, where it is screened by a screening structure. The screened coal is then guided to different concave inclined conveyor blocks. A belt conveyor on another concave inclined conveyor block steadily guides coal smaller than a certain size, while larger coal is guided to a concave inclined conveyor block without a belt conveyor. The inclination of the concave inclined conveyor blocks then guides the excessively large coal into a circulation structure, where it is then circulated. Coal is guided into the inner side of the crushing and grinding box. Through the feeding funnel-shaped guide block, the coal on the belt conveyor on the concave inclined conveyor block is guided to the three arc-shaped limiting plates inside the Y-shaped screening block. The rotary drive motor rotates the rotary drive cylinder block at its drive end. This cylinder block drives several loop-shaped rotary limiting blocks. The rotation of the loop-shaped funnel-shaped rotary aggregating blocks on these loop-shaped limiting blocks causes the coal inside the Y-shaped screening block to be rotary-screened. Through this inclined rotary screening, and simultaneously through the rotating filter screen, the coal is driven to fall downwards, gathering on the arc-shaped screening plate. The arc-shaped screening plate then distributes the coal to different concave inclined conveyor blocks, thus driving the transport of undersized coal and the recycling and crushing of oversized coal.

[0008] Preferably, the circulation structure includes: a horn-shaped circulation drain pipe, a circulation tower, several circulation cylindrical inner boxes, several loop-shaped circulation drain blocks, several circulation drive shafts, several rotating scrapers, a pair of circulation drive motors, and a pair of circulation gear sets.

[0009] The circulating tower is installed on the processing support. The horn-shaped circulating guide pipe is connected to the circulating tower and the concave inclined transport block. Several circulating cylindrical inner boxes are evenly inserted into the inner side of the circulating tower. Several U-shaped circulating guide blocks are respectively connected to several circulating cylindrical inner boxes and the crushing and grinding box. Several circulating drive shafts are respectively inserted into several circulating cylindrical inner boxes and the crushing and grinding box. Several rotating scrapers are respectively installed on several circulating drive shafts. A pair of circulating gear sets are respectively installed on several circulating drive shafts. A pair of circulating drive motor drive ends are respectively connected to a pair of circulating gear sets.

[0010] It should be noted that, as described above, the excessively large coal is diverted to the inner side of the circulating cylindrical inner box inside the circulating tower via the horn-shaped circulating diversion pipe inside the concave inclined transport block. A pair of circulating drive motors then drive the circulating gear sets on the drive ends of the pair of circulating drive motors. The circulating gear sets drive several circulating drive shafts, which in turn drive several rotating scrapers. The rotating scrapers push the coal one by one to the inner side of the U-shaped circulating diversion block. The U-shaped circulating diversion block then rotates and diverts the coal upwards one by one, and finally diverts the circulating coal to the inner side of the crushing and grinding box.

[0011] Preferably, the crushing and grinding structure includes: a plurality of horn-shaped flow limiting blocks, a plurality of crushing rollers, a plurality of grinding rollers, grinding cylindrical blocks, a pair of arc grinding blocks, a spiral lifting support block, two pairs of lifting grinding threaded rods, two pairs of lifting grinding threaded tubes, a lifting grinding gear set, and a lifting grinding drive motor.

[0012] A plurality of horn-shaped flow-limiting blocks are evenly installed on the crushing and grinding box. A plurality of crushing rollers and a plurality of grinding rollers are evenly installed on the inner side of the crushing and grinding box, and the plurality of crushing rollers and the plurality of grinding rollers are located between the plurality of horn-shaped flow-limiting blocks. The grinding cylindrical block is inserted into the inner side of the crushing and grinding box through bearings. The spiral lifting support block is installed on the inner side of the crushing and grinding box. Two pairs of lifting grinding threaded rods are inserted into the spiral lifting support block and the horn-shaped flow-limiting block through bearings. Two pairs of lifting grinding threaded tubes are respectively inserted into a pair of arc grinding blocks, and the two pairs of lifting grinding threaded tubes are respectively fitted onto a pair of lifting grinding threaded rods. The lifting grinding gear set is installed on the two pairs of lifting grinding threaded rods. The driving end of the lifting grinding drive is connected to the lifting grinding gear set.

[0013] It should be noted that, in the above process, the coal is crushed by the crushing drum, and then guided to the grinding drum by the horn-shaped flow limiting block. Through the cooperation of several grinding drums, the coal is ground. Afterward, the flow is guided to the grinding cylindrical block and a pair of arc grinding blocks by the horn-shaped flow limiting block. The lifting grinding drive motor runs, which drives the lifting grinding gear set on the drive end of the lifting grinding drive motor. The lifting grinding gear set drives the lifting grinding threaded rod on it to rotate, which drives the lifting grinding threaded tube on it. The two pairs of lifting grinding threaded tubes drive the pair of arc grinding blocks on them to move vertically up and down. By changing the distance between the pair of arc grinding blocks and the grinding cylindrical block, the grinding effect is changed.

[0014] Preferably, the processing support is provided with a plurality of covered boxes.

[0015] Preferably, two pairs of L-shaped sealing strips are provided on the pair of arc grinding blocks and the horn-shaped flow limiting block.

[0016] Preferably, each of the three concave inclined transport blocks is provided with a pair of triangular guide blocks.

[0017] Preferably, several of the rotary limiting blocks are provided with replacement slots, and several of the filter screens are slidably inserted into the inner side of several of the replacement slots.

[0018] Preferably, the bottom end of the L-shaped rotary unloading plate is provided with a drainage strip.

[0019] Preferably, a plurality of support shafts are provided on a pair of concave inclined transport blocks.

[0020] Preferably, the concave inclined transport block is provided with an air inflator and an air pump.

[0021] The circulating screening device for coal conveying belts in thermal power plants, manufactured using the technical solution of this invention, has the following advantages compared to existing technologies: First, it achieves automated coal processing. From dumping, crushing, grinding to screening, the entire process is completed through mechanical structures, greatly improving processing efficiency and reducing the need for manual operation. Second, the crushing and grinding structure can efficiently process coal of different particle sizes, bringing them to a suitable size for further processing or combustion, ensuring the stability and efficiency of boiler combustion. Furthermore, the screening structure is ingeniously designed, using Y-shaped screening blocks and rotary screening to precisely separate coal according to size, achieving refined coal processing. The introduction of a circulating structure is also a highlight, allowing excessively large coal to be returned to the crushing and grinding box for reprocessing, ensuring all coal reaches the appropriate particle size and avoiding resource waste. Finally, each part of the process is carefully designed, such as the crushing drum, grinding drum, and lifting grinding mechanism, and their coordination makes the entire process smoother and more efficient. Attached Figure Description

[0022] Figure 1 This is a front sectional view of a circulating screening device for coal conveying in thermal power plants according to the present invention.

[0023] Figure 2 This is a side cross-sectional schematic diagram of a circulating screening device for coal conveying belts in thermal power plants according to the present invention.

[0024] Figure 3 This is a top sectional view of a circulating screening device for coal conveying in thermal power plants, as described in this invention.

[0025] Figure 4 This is a rear cross-sectional schematic diagram of a circulating screening device for coal conveying in thermal power plants according to the present invention.

[0026] Figure 5 for Figure 2 A magnified view of the letter "A" in the image.

[0027] In the diagram: 1. Concave inclined conveyor block; 2. Belt conveyor; 3. Y-shaped screening block; 4. Crushing and grinding box; 1001. Feeding funnel-shaped guide block; 1002. Arc-shaped limiting plate; 1003. Rotary drive motor; 1004. Rotary drive cylindrical block; 1005. U-shaped rotary limiting block; 1006. Arc-shaped buffer spring; 1007. Filter screen; 1008. Arc-shaped rotating block; 1009. U-shaped funnel-shaped rotating gathering block; 1010. Arc-shaped screening plate; 1011. U-shaped guide block; 1012. L-shaped rotary unloading plate; 1013. Rotary unloading shaft; 1014. Arc-shaped rotating shaft tube; 1015. Arc-shaped rotating shaft rod; 1016. Arc-shaped buffer slider; 2001. Horn-shaped circulation guide pipe; 2002. Circulation tower; 2003. Circulation cylindrical inner box; 2004. U-shaped circulation guide block; 2005. Circulation drive shaft; 2006. Rotary scraper; 2007. Circulation drive motor; 2008. Circulation gear set; 3001. Horn-shaped flow limiting block; 3002. Crushing drum; 3003. Grinding drum; 3004. Grinding cylindrical block; 3005. Arc-shaped grinding block; 3006. U-shaped lifting support block; 3007. Lifting grinding threaded rod; 3008. Lifting grinding threaded pipe; 3009. Lifting grinding gear set; 3010. Lifting grinding drive motor. Detailed Implementation

[0028] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, without explaining the electrical control.

[0029] Example

[0030] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-5As shown, three concave inclined transport blocks 1 are mounted on the processing support, the Y-shaped screening block 3 is connected to the three concave inclined transport blocks 1, a pair of belt conveyors 2 are mounted on the three concave inclined transport blocks 1, the crushing and grinding box is mounted on the processing support, the Y-shaped screening block 3 is equipped with a screening structure, the concave inclined transport blocks 1 and the crushing and grinding box are equipped with a circulation structure, and the crushing and grinding box is equipped with a crushing and grinding structure; the screening structure includes: a feeding funnel-shaped guide block, three arc-shaped limiting plates, a rotary drive motor, a rotary drive cylindrical block, several spiral-shaped rotary limiting blocks, several filter screens, several arc-shaped rotating blocks, and several spiral-shaped funnel-shaped rotating blocks. The system comprises an agglomeration block, a pair of arc-shaped screening plates 1010, a spiral-shaped guide block 1011, an L-shaped rotary unloading plate 1012, a rotary unloading shaft 1013, a pair of arc-shaped rotary shaft tubes 1014, a pair of arc-shaped rotary shaft rods 1015, a pair of arc-shaped buffer sliders, and a pair of arc-shaped buffer springs. The feeding horn-shaped guide block is mounted on the concave inclined transport block 1. Three arc-shaped limiting plates are inserted into the processing bracket and the Y-shaped screening block 3. The rotary drive motor is mounted on the processing bracket. The rotary drive cylindrical block is mounted on the drive end of the rotary drive motor, and the rotary drive cylindrical block is movably inserted into the inner side of the three arc-shaped limiting plates. Several spiral-shaped rotary limiting blocks are inserted into the rotary drive motor. On a cylindrical block, several filter screens are mounted on several loop-shaped rotating limiting blocks, several arc-shaped rotating blocks are respectively mounted on several loop-shaped rotating limiting blocks, several loop-shaped horn-shaped rotating gathering blocks are respectively mounted on the upper and lower ends of several loop-shaped rotating limiting blocks, a pair of arc-shaped screening plates 1010 are mounted on three arc-shaped limiting plates, a loop-shaped guide block 1011 is mounted on the Y-shaped screening block 3 and the concave inclined transport block 1, an L-shaped rotating unloading plate is inserted into the loop-shaped guide block 1011 through the rotating unloading shaft 1013, a pair of arc-shaped rotating shaft tubes 1014 are inserted parallel to each other into the concave inclined transport block 1, and a pair of arc-shaped rotating... The shafts 1015 are movably inserted into the inner sides of a pair of arc-shaped rotating shaft tubes 1014, and the pair of arc-shaped buffer sliders are movably inserted into the inner sides of a pair of arc-shaped rotating shaft tubes 1014, and the pair of arc-shaped buffer sliders are respectively connected to the pair of arc-shaped rotating shafts 1015. The pair of arc-shaped buffer springs are respectively installed on the inner sides of a pair of arc-shaped rotating shaft tubes 1014, and the pair of arc-shaped buffer springs are respectively connected to the pair of arc-shaped buffer sliders. The circulation structure includes: a horn-shaped circulation drain pipe, a circulation tower, several circulation cylindrical inner boxes, several loop-shaped circulation drain blocks 2004, several circulation drive shafts, several rotating scrapers, a pair of circulation drive motors, and a pair of circulation gear sets.The circulating tower is mounted on the processing support. The horn-shaped circulating guide pipe is connected to the circulating tower and the concave inclined transport block 1. Several circulating cylindrical inner boxes are evenly inserted into the inner side of the circulating tower. Several U-shaped circulating guide blocks 2004 are respectively connected to several circulating cylindrical inner boxes 2003 and the crushing and grinding box 4. Several circulating drive shafts are respectively inserted into several circulating cylindrical inner boxes and the crushing and grinding box. Several rotating scrapers are respectively mounted on several circulating drive shafts. A pair of circulating gear sets are respectively mounted on several circulating drive shafts. A pair of circulating drive motor drive ends are respectively connected to a pair of circulating gear sets. The crushing and grinding structure includes: several horn-shaped flow limiting blocks 3001, several crushing rollers 3002, several grinding rollers 3003, grinding cylindrical blocks 3004, a pair of arc grinding blocks 3005, and U-shaped lifting support blocks 3006. The system comprises two pairs of lifting grinding threaded rods 3007, two pairs of lifting grinding threaded tubes 3008, a lifting grinding gear set, and a lifting grinding drive motor; several horn-shaped flow-limiting blocks 3001 are evenly installed on the grinding box; several grinding rollers 3002 and several grinding rollers 3003 are evenly installed inside the grinding box, with the grinding rollers 3002 and several grinding rollers 3003 located between the horn-shaped flow-limiting blocks 3001; a grinding cylindrical block 3004 is inserted into the inside of the grinding box via bearings; and a spiral lifting... A lowering support block 3006 is installed inside the crushing and grinding box. Two pairs of lifting and grinding threaded rods 3007 are inserted into the U-shaped lifting support block 3006 and the horn-shaped flow limiting block 3001 via bearings. Two pairs of lifting and grinding threaded tubes 3008 are respectively inserted into a pair of arc-shaped grinding blocks 3005, and the two pairs of lifting and grinding threaded tubes 3008 are respectively fitted onto a pair of lifting and grinding threaded rods 3007. The lifting and grinding gear set is installed on the two pairs of lifting and grinding threaded rods 3007, and the driving end of the lifting and grinding drive is connected to the lifting and grinding gear set. The processing support is equipped with several covered housings; two pairs of L-shaped sealing strips are provided on the pair of arc grinding blocks 3005 and the horn-shaped flow limiting block 3001; each of the three concave inclined transport blocks 1 is equipped with a pair of triangular flow guiding blocks; several of the rotary limiting blocks are provided with replacement slots, and several of the filter screens are slidably inserted into the inner side of the several replacement slots; the bottom end of the L-shaped rotary unloading plate 1012 is provided with a flow guiding strip; several support shafts are provided on the pair of concave inclined transport blocks 1; an air inlet pipe and an air pump are provided on the concave inclined transport blocks 1.

[0031] According to the appendix Figure 1-5It is concluded that by first pouring coal into the inner side of the crushing and grinding box, the coal is crushed and ground by the crushing and grinding structure inside the crushing and grinding box. The crushed coal is then guided to the belt conveyor 2 on the concave inclined conveyor block 1. The belt conveyor 2 on the concave inclined conveyor block 1 transports the coal to the inner side of the Y-shaped screening block 3. The coal is then screened by the screening structure on the Y-shaped screening block 3. The screened coal is then guided to different concave inclined conveyor blocks 1, and transported by the belt conveyor on another concave inclined conveyor block 1. Conveyor 2 steadily guides coal smaller than a certain size, while coal larger than a certain size is guided unidirectionally to a concave inclined conveyor block 1 without a belt conveyor 2. The inclination of the concave inclined conveyor block 1 drives the excessively large coal into a circulation structure. This circulation structure then guides the excessively large coal to the inside of the crushing and grinding chamber. A feeding funnel-shaped guide block guides the coal from the belt conveyor 2 on the concave inclined conveyor block 1 to between the three arc-shaped limiting plates inside the Y-shaped screening block 3. The rotating drive motor then drives... The rotary drive cylinder on the drive end of the rotary drive motor rotates, which in turn drives several loop-shaped rotary limiting blocks on it. The rotation of the loop-shaped funnel-shaped rotary aggregating blocks on these limiting blocks further drives the rotational screening of the coal inside the Y-shaped screening block 3. Through this inclined rotary screening, and simultaneously through the rotating filter screen, the coal is driven downwards and collected onto the arc-shaped screening plate 1010. The arc-shaped screening plate 1010 then distributes the coal into different concave inclined... The transport block 1 drives the transport of undersized coal and the recycling and crushing of oversized coal. Through the horn-shaped circulation diversion pipe inside the concave inclined transport block 1, the oversized coal is diverted to the inner side of the circulation cylindrical inner box inside the circulation tower. A pair of circulation drive motors drive the circulation gear sets on the drive ends of the pair of circulation drive motors. The pair of circulation gear sets drive several circulation drive shafts on them. The several circulation drive shafts drive several rotating scrapers on them. The several rotating scrapers 2006 push the coal one by one to the inner side of the U-shaped circulation diversion block 2004. The U-shaped circulation diversion block 2004 rotates and diverts the coal one by one upwards. Then the circulating coal is diverted to the inner side of the crushing and grinding box.Coal is crushed by the crushing drum 3002, and then guided to the grinding drums 3003 by the horn-shaped flow-limiting block 3001. The coal is ground by the cooperation of several grinding drums 3003, and then guided to the grinding cylindrical block 3004 and a pair of arc-shaped grinding blocks 3005 by the horn-shaped flow-limiting block 3001. The lifting grinding drive motor operates, driving the lifting grinding gear set on its drive end. The lifting grinding gear set drives the lifting grinding threaded rod 3007 to rotate, which in turn drives the lifting grinding threaded tube 3008. The two pairs of lifting grinding threaded tubes 3008 then drive the pair of arc-shaped grinding blocks 3005 to vertically rise and fall. By changing the distance between the pair of arc-shaped grinding blocks 3005 and the grinding cylindrical block 3004, the grinding effect is altered.

[0032] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A circulating screening device for coal conveyor belts in thermal power plants, comprising: The present invention comprises three concave inclined conveyor blocks, a pair of belt conveyors, a Y-shaped screening block, a processing support, and a grinding and crushing box, characterized in that the three concave inclined conveyor blocks are mounted on the processing support, the Y-shaped screening block is connected to the three concave inclined conveyor blocks, the pair of belt conveyors are mounted on the three concave inclined conveyor blocks, the grinding and crushing box is mounted on the processing support, the Y-shaped screening block is equipped with a screening structure, the concave inclined conveyor blocks and the grinding and crushing box are equipped with a circulation structure, and the grinding and crushing box is equipped with a grinding and crushing structure. The screening structure includes: a feeding horn-shaped guide block, three arc-shaped limiting plates, a rotary drive motor, a rotary drive cylindrical block, several spiral-shaped rotary limiting blocks, several filter screens, several arc-shaped rotating blocks, several spiral-shaped horn-shaped rotating gathering blocks, a pair of arc-shaped screening plates, spiral-shaped guide blocks, L-shaped rotary discharge plates, rotary discharge shafts, a pair of arc-shaped rotating shaft tubes, a pair of arc-shaped rotating shaft rods, a pair of arc-shaped buffer sliders, and a pair of arc-shaped buffer springs; The feeding horn-shaped guide block is installed on the concave inclined transport block; three arc-shaped limiting plates are inserted into the processing bracket and the Y-shaped screening block; the rotary drive is installed on the processing bracket; the rotary drive cylindrical block is installed on the drive end of the rotary drive, and the rotary drive cylindrical block is movably inserted into the inner side of the three arc-shaped limiting plates; several spiral-shaped rotary limiting blocks are inserted into the rotary drive cylindrical block; several filter screens are installed on several spiral-shaped rotary limiting blocks; several arc-shaped rotary blocks are respectively installed on several spiral-shaped rotary limiting blocks; several spiral-shaped horn-shaped rotary gathering blocks are respectively installed on the upper and lower ends of several spiral-shaped rotary limiting blocks; a pair of circular... An arc screening plate is mounted on three arc-shaped limiting plates. A spiral guide block is mounted on the Y-shaped screening block and the concave inclined transport block. An L-shaped rotary unloading plate is inserted into the spiral guide block via the rotary unloading shaft. A pair of arc-shaped rotating shaft tubes are inserted parallel to each other on the concave inclined transport block. A pair of arc-shaped rotating shaft rods are respectively movably inserted into the inner side of the pair of arc-shaped rotating shaft tubes. A pair of arc-shaped buffer sliders are respectively movably inserted into the inner side of the pair of arc-shaped rotating shaft tubes, and the pair of arc-shaped buffer sliders are respectively connected to the pair of arc-shaped rotating shaft rods. A pair of arc-shaped buffer springs are respectively mounted into the inner side of the pair of arc-shaped rotating shaft tubes, and the pair of arc-shaped buffer springs are respectively connected to the pair of arc-shaped buffer sliders.

2. The circulating screening device for coal conveyor belts in thermal power plants according to claim 1, characterized in that, The circulation structure includes: a horn-shaped circulation drain pipe, a circulation tower, several circulation cylindrical inner boxes, several loop-shaped circulation drain blocks, several circulation drive shafts, several rotating scrapers, a pair of circulation drive motors, and a pair of circulation gear sets. The circulation tower is mounted on the processing support. The horn-shaped circulation guide pipe is connected to the circulation tower and the concave inclined transport block. Several circulation cylindrical inner boxes are evenly inserted into the inner side of the circulation tower. Several U-shaped circulation guide blocks are respectively connected to several circulation cylindrical inner boxes and the crushing and grinding box. Several circulation drive shafts are respectively inserted into several circulation cylindrical inner boxes and the crushing and grinding box. Several rotating scrapers are respectively mounted on several circulation drive shafts. A pair of circulation gear sets are respectively mounted on several circulation drive shafts. A pair of circulation drive motor drive ends are respectively connected to a pair of circulation gear sets.

3. A circulating screening device for coal conveyor belts in thermal power plants according to claim 2, characterized in that, The crushing and grinding structure includes: several horn-shaped flow limiting blocks, several crushing rollers, several grinding rollers, grinding cylindrical blocks, a pair of arc grinding blocks, a spiral lifting support block, two pairs of lifting grinding threaded rods, two pairs of lifting grinding threaded tubes, a lifting grinding gear set, and a lifting grinding drive motor. A plurality of horn-shaped flow-limiting blocks are evenly installed on the grinding and crushing box. A plurality of grinding rollers and a plurality of crushing rollers are evenly installed on the inner side of the grinding and crushing box, and the plurality of grinding rollers and the plurality of crushing rollers are located between the plurality of horn-shaped flow-limiting blocks. The grinding cylindrical block is inserted into the inner side of the grinding and crushing box through bearings. The spiral lifting support block is installed on the inner side of the grinding and crushing box. Two pairs of lifting grinding threaded rods are inserted into the spiral lifting support block and the horn-shaped flow-limiting block through bearings. Two pairs of lifting grinding threaded tubes are respectively inserted into a pair of arc grinding blocks, and the two pairs of lifting grinding threaded tubes are respectively fitted onto a pair of lifting grinding threaded rods. The lifting grinding gear set is installed on the two pairs of lifting grinding threaded rods. The driving end of the lifting grinding drive is connected to the lifting grinding gear set.

4. A circulating screening device for coal conveyor belts in thermal power plants according to claim 3, characterized in that, The processing support is equipped with several covered boxes.

5. A circulating screening device for coal conveyor belts in thermal power plants according to claim 4, characterized in that, Two pairs of L-shaped sealing strips are provided on the pair of arc grinding blocks and the horn-shaped current limiting block.

6. A circulating screening device for coal conveyor belts in thermal power plants according to claim 5, characterized in that, Each of the three concave inclined transport blocks is provided with a pair of triangular diversion blocks.

7. A circulating screening device for coal conveyor belts in thermal power plants according to claim 6, characterized in that, Several of the rotary limiting blocks are provided with replacement slots, and several of the filter screens are slidably inserted into the inner side of the several replacement slots.

8. A circulating screening device for coal conveyor belts in thermal power plants according to claim 7, characterized in that, The bottom end of the L-shaped rotary unloading plate is provided with a drainage strip.

9. A circulating screening device for coal conveying belts in thermal power plants according to claim 8, characterized in that, A number of support shafts are provided on a pair of concave inclined transport blocks.

10. A circulating screening device for coal conveying belts in thermal power plants according to claim 9, characterized in that, The concave inclined transport block is equipped with an air inflator and an air pump.

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