Coal screening device with floating connection structure of screen body for thermal power generation

Abstract

The present application relates to the technical field of coal screening equipment, and particularly relates to a coal screening device for thermal power generation with a floating connection structure of a screen body, which comprises a main frame, a supporting frame connected to the top of the main frame through a buffer assembly, a screening mechanism rotatably assembled in the supporting frame, the screening mechanism comprising a fixed ring, a plurality of filter rod units parallel to the axis of the fixed ring arranged in the circumferential array of the fixed ring, each filter rod unit comprising a fixed rod connected to the fixed ring, an adjusting rod slidably installed in the fixed rod, and a driving groove formed in the side opposite to the adjusting rod. The main frame, the buffer assembly and the supporting frame are connected in a floating manner, the fixed ring and the filter rod unit improve the screening efficiency, the push rod assembly can adjust the distance between the filter rods, the docking assembly can automatically clear the blockage, and the components are cooperated to ensure the accurate and stable screening, meet the light load demand, and reduce the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of coal screening equipment technology, and in particular to a light-load coal screening device for thermal power generation with a floating screen body connection structure. Background Technology

[0002] In the coal conveying system of thermal power plants, coal screening is a critical pretreatment step to ensure stable boiler combustion and safe operation of the pulverizing system. The screening effect directly impacts power generation efficiency and equipment maintenance costs. Raw coal typically contains large pieces of coal, gangue, and impurities. If it enters subsequent processes directly without being graded and screened, it can easily cause belt conveyor tearing and pulverizing equipment blockage. Furthermore, unevenly sized coal can lead to incomplete combustion in the boiler, increasing energy consumption and fly ash carbon content, and may also cause safety hazards such as furnace coking and wear of heating surfaces.

[0003] Current coal screening devices for thermal power generation still suffer from numerous technical shortcomings, making it difficult to meet the core requirements of light-load, low-crushing, and high-efficiency screening. Firstly, most devices employ a rigid connection between the screen body and the frame, which fails to effectively dissipate the vibration and impact generated by the rotation of the screening mechanism during operation. This not only exacerbates wear on equipment components and shortens the device's lifespan but also leads to violent rigid collisions between the coal and the screen body and filter rods, causing excessive coal crushing and generating large amounts of ultrafine coal dust. This disrupts the boiler's designed combustion conditions, increases dust pollution and the load on the dust removal system, and even raises the risk of dust explosions. Secondly, the filter rod spacing in existing devices is mostly fixed, or the adjustment structure is complex and lacks precision, failing to flexibly adapt to the screening requirements of coal for thermal power generation with different particle sizes, resulting in poor versatility. Summary of the Invention

[0004] This invention provides a lightweight coal screening device for thermal power generation with a floating screen body connection structure, in order to solve the problems mentioned in the background art, such as large vibration due to rigid connection, high coal breakage rate, inconvenient adjustment of filter rod spacing, and low screening accuracy of existing coal screening devices.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a light-load screening device for coal used in thermal power generation with a floating connection structure of the screen body, including a main frame, a support frame connected to the top of the main frame through a buffer assembly, a screening mechanism being rotatably assembled inside the support frame, the screening mechanism including a fixed ring, and a plurality of filter rod units parallel to the axis of the fixed ring being arranged in a circular array inside the fixed ring.

[0006] The filter rod unit includes a fixed rod connected to a fixed ring. An adjusting rod is slidably installed inside the fixed rod. A drive groove is provided on the opposite side of the adjusting rod. A push rod assembly is provided inside the fixed rod between the adjusting rods. A push bolt is provided on the outside of the push rod assembly at a position corresponding to the drive groove. One end of the push bolt is slidably installed inside the drive groove. A docking assembly is provided on the outside of the support frame at a position corresponding to the push rod assembly. A sliding opening is provided through the outer wall of the fixed rod at a position corresponding to the docking assembly.

[0007] The present invention is further configured such that the docking assembly includes a fixed plate fixedly connected to the support frame, an installation shell is provided between the fixed plates, the installation shell has a docking interface on the side near the screening mechanism, an inclined docking block is slidably installed inside the installation shell, one end of the docking block extends into the docking interface, the other end of the docking block is connected to an elastic element, and one end of the elastic element is connected to the installation shell.

[0008] The present invention is further configured such that the push rod assembly includes a first rod, a movable block, and a second rod, the movable block being slidably installed between the first rod and the second rod at a position corresponding to the docking assembly, the top of the movable block being provided with a docking bolt, the top end of the docking bolt extending through the sliding opening into the interior of the docking assembly.

[0009] The present invention is further configured such that a limiting groove is provided at one end of the rod one near the movable block, and a docking slider is provided at the position of the movable block corresponding to the limiting groove. The docking slider is slidably installed inside the limiting groove. An movable opening is provided at one end of the rod two corresponding to the movable block, and one end of the movable block is slidably connected to the inner wall of the movable opening.

[0010] The present invention is further configured such that the movable opening is provided with a first docking surface and a top surface, the outer wall of the movable block is provided with a first extrusion surface corresponding to the first docking surface, the outer wall of the movable block is provided with a second extrusion surface corresponding to the top surface, and an elastic element is provided on one side of the movable block.

[0011] The present invention is further configured such that a connector is provided at the other end of the second rod, and an elastic element four is provided inside the connector.

[0012] The present invention is further configured such that the fixing ring includes a first ring body, a second ring body, and a third ring body arranged coaxially, and the two ends of the fixing rod are respectively connected to adjacent ring bodies. A pushing component is provided inside the first ring body, and pushing rings are slidably assembled inside the second and third ring bodies. The filter rod unit is respectively installed between the first, second, and third ring bodies of the fixing ring. The fixing ring is rotatably installed inside the support frame, and the push rod assembly is respectively connected to the pushing ring and the pushing component.

[0013] The present invention is further configured such that an elastic element two is provided inside the ring body three, one end of the elastic element two is connected to the push ring, and an installation port one is provided on the outer wall of the ring body one, the ring body two, and the ring body three at the position corresponding to the adjustment rod, and both ends of the adjustment rod extend into the installation port one and are slidably connected thereto.

[0014] The present invention is further configured such that the pushing component includes a drive ring one rotatably mounted inside a ring body one, and a drive ring two slidably mounted inside the ring body one near the drive ring one. The drive ring two and the drive ring one have wedge-shaped surfaces on their respective sides. The drive ring one away from the drive ring two has a toothed ring one on its side. The drive gear two is rotatably mounted inside the ring body one near the toothed ring one. The drive motor two is located outside the ring body one near the drive gear two. The output end of the drive motor two passes through the ring body one and is connected to the drive gear two.

[0015] The beneficial effects of the present invention, a lightweight coal screening device for thermal power generation with a floating screen body connection structure, are as follows:

[0016] 1. This device achieves a floating connection of the screen body through the coordinated operation of the main frame, buffer components, and support frame. This effectively eliminates vibration and impact during coal feeding and screening, reduces component wear, extends service life, and minimizes rigid collisions between coal and components, preventing excessive coal crushing. It meets the light-load screening requirements for coal used in thermal power generation, ensuring uniform coal particle size. The fixed ring and filter rod units work together to improve screening efficiency and stability. Filter rod units are installed between the rings of the fixed ring, ensuring a neat, circumferentially aligned distribution without screening dead zones. The fixed rods are fixedly connected to the rings, preventing the filter rod units from loosening or shifting due to centrifugal force. The internal fixed rods, adjusting rods, push rod assemblies, and push bolts of the filter rod units work in tandem, allowing for precise adjustment of the filter rod spacing to accommodate coal of different particle sizes, thus solving the problem of narrow applicability of existing devices.

[0017] 2. The mounting ports of each ring have a pair of adjusting rods that act as guides and limiters, ensuring smooth adjustment of the filter rod spacing and preventing the adjusting rods from falling off. The push assembly, in conjunction with the push ring and elastic element, achieves synchronous adjustment and smooth reset of the filter rod spacing, ensuring consistent screening particle size. Precise transmission of all components within the push assembly prevents power jamming and further improves screening accuracy. The docking assembly, push rod assembly, and filter rod unit work together to automatically clear obstructions without manual intervention, preventing both efficiency loss due to obstruction and secondary crushing of the coal caused by impact. The coordinated operation of all components within the push rod assembly ensures stable power transmission and smooth reset, enabling cyclical operation of screening, clearing blockages, and reset, ensuring long-term stable operation of the device and reducing maintenance costs. Attached Figure Description

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with the accompanying drawings.

[0019] Please provide a detailed explanation.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Figure 1 This is a three-dimensional structural diagram of a lightweight coal screening device for thermal power generation with a floating screen body connection structure according to the present invention.

[0022] Figure 2 This is a cross-sectional view of the screening mechanism and support frame of a light-load coal screening device for thermal power generation with a floating connection structure of the screen body according to the present invention.

[0023] Figure 3 This is a cross-sectional view of the screening mechanism of a light-load coal screening device for thermal power generation with a floating connection structure of the screen body according to the present invention.

[0024] Figure 4 This is a fixed ring sectional view of a lightly loaded coal screening device for thermal power generation with a floating connection structure of the screen body according to the present invention.

[0025] Figure 5 This is a diagram showing the separation of the pushing component of a light-load coal screening device for thermal power generation with a floating connection structure for the screen body, according to the present invention.

[0026] Figure 6 This is an enlarged view of the filter rod unit of a lightweight coal screening device for thermal power generation with a floating connection structure for the screen body, according to the present invention.

[0027] Figure 7 This is a diagram showing the filter rod unit separation of a lightweight coal screening device for thermal power generation with a floating connection structure for the screen body, according to the present invention.

[0028] Figure 8 This is a diagram showing the separation of the pusher assembly of a light-load coal screening device for thermal power generation with a floating connection structure for the screen body, according to the present invention.

[0029] Figure 9This is a partially enlarged view of the docking assembly of a lightweight coal screening device for thermal power generation with a floating connection structure for the screen body, according to the present invention.

[0030] Figure 10 This is a cross-sectional view of the docking assembly of a lightweight coal screening device for thermal power generation, which has a floating connection structure for the screen body according to the present invention.

[0031] The diagram is labeled as follows: 1. Main frame; 11. Buffer assembly; 2. Support frame; 21. Docking assembly; 211. Fixing plate; 212. Mounting shell; 213. Docking interface; 214. Docking block; 215. Elastic element one; 3. Screening mechanism; 31. Fixing ring; 311. Ring body one; 3111. Drive gear two; 3112. Drive motor two; 312. Pushing assembly; 3121. Drive ring one; 3122. Drive ring two; 3123. Wedge surface; 3124. Gear ring one; 313. Ring body two; 314. Ring body three; 3142. Elastic element two; 315. Mounting port one; 316. 32. Push ring; 32. Filter rod unit; 321. Fixed rod; 3211. Sliding port; 322. Adjusting rod; 3221. Drive groove; 323. Push rod assembly; 3231. Rod one; 32311. Limiting groove; 3232. Movable block; 32321. Connecting slider; 32322. Connecting bolt; 32323. Elastic element three; 32324. Extrusion surface one; 32325. Extrusion surface two; 3233. Rod two; 32331. Movable port; 32332. Connecting surface one; 32333. Top surface; 32334. Connecting joint; 32335. Elastic element four; 324. Push bolt. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a transmission connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two elements or the interaction between two elements.

[0034] Please see Figure 1 - Figure 10 A light-load coal screening device for thermal power generation with a floating connection structure of the screen body includes a main frame 1. The top of the main frame 1 is connected to a support frame 2 through a buffer assembly 11. A screening mechanism 3 is rotatably assembled inside the support frame 2. The screening mechanism 3 includes a fixed ring 31. Several filter rod units 32 parallel to the axis of the fixed ring 31 are arranged in a circular array inside the fixed ring 31.

[0035] The filter rod unit 32 includes a fixed rod 321 connected to a fixed ring 31. An adjusting rod 322 is slidably installed inside the fixed rod 321. A drive groove 3221 is provided on the opposite side of the adjusting rod 322. A push rod assembly 323 is provided inside the fixed rod 321 between the adjusting rods 322. A push bolt 324 is provided on the outside of the push rod assembly 323 at a position corresponding to the drive groove 3221. One end of the push bolt 324 is slidably installed inside the drive groove 3221. A docking assembly 21 is provided on the outside of the support frame 2 at a position corresponding to the push rod assembly 323. A sliding opening 3211 is provided through the outer wall of the fixed rod 321 at a position corresponding to the docking assembly 21.

[0036] By adopting the above technical solution, the main frame 1 is elastically connected to the support frame 2 through the buffer component 11. The support frame 2 is equipped with the screening mechanism 3 through precision bearings to ensure stable rotation of the screen body under vibration conditions. The fixed rod 321 works in conjunction with the adjusting rod 322, the push bolt 324 and the push rod assembly 323 to achieve dynamic and precise adjustment of the filter rod unit 32. The components of the docking component 21 work together to complete intelligent triggering and reset. The rings of the fixed ring 31 work in conjunction with the filter rod unit 32 to ensure dynamic balance of the screen surface and adaptability to screening of different coal materials.

[0037] The docking assembly 21 includes a fixed plate 211 fixedly connected to the support frame 2. A mounting shell 212 is provided between the fixed plates 211. A docking interface 213 is provided on the side of the mounting shell 212 near the screening mechanism 3. An inclined docking block 214 is slidably installed inside the mounting shell 212. One end of the docking block 214 extends into the docking interface 213, and the other end of the docking block 214 is connected to an elastic element 215. One end of the elastic element 215 is connected to the mounting shell 212. The push rod assembly 323 includes a rod 3231, a movable block 3232, and a rod 3233. The movable block 3232 is slidably installed between the rod 3231 and the rod 3233 at the position corresponding to the docking assembly 21. A docking bolt 32322 is provided on the top of the movable block 3232. The top end of the docking bolt 32322 extends through the sliding opening 3211 into the interior of the docking assembly 21. A limiting groove 32311 is provided at one end of rod 3231 near the movable block 3232. A docking slider 32321 is provided on the movable block 3232 at the position corresponding to the limiting groove 32311. The docking slider 32321 is slidably installed inside the limiting groove 32311. An opening 32331 is provided at one end of rod 3233 corresponding to the movable block 3232. One end of the movable block 3232 is slidably connected to the inner wall of the opening 32331. A docking surface 32332 and a top surface 32333 are provided inside the opening 32331. An extrusion surface 32324 is provided on the outer wall of the movable block 3232 at the position corresponding to the docking surface 32332. An extrusion surface 32325 is provided on the outer wall of the movable block 3232 at the position corresponding to the top surface 32333. An elastic element 32323 is provided on one side of the movable block 3232. The other end of rod 2 3233 is provided with a connector 32334, and the connector 32334 is provided with an elastic element 4 32335.

[0038] By adopting the above technical solutions, the docking assembly 21, push rod assembly 323 and related components have significant synergistic advantages: the docking assembly 21 is rigidly connected to the support frame 2 through the fixing plate 211, and the docking block 214, elastic element 1 215 and docking bolt 32322 inside the mounting shell 212 work together to achieve stable triggering and displacement of the movable block 3232; the push rod assembly 323's rod 1 3231, docking slider 32321, movable block 3232, rod 2 3233 and other components work together to ensure precise transmission and continuous reset; the dynamic locking system and the collaborative unblocking mechanism work together to ensure stable and interference-free operation and efficient unblocking.

[0039] The fixed ring 31 includes three coaxially arranged ring bodies: a first ring body 311, a second ring body 313, and a third ring body 314. The two ends of the fixed rod 321 are respectively connected to the adjacent ring bodies. A pushing component 312 is provided inside the first ring body 311. Pushing rings 316 are slidably assembled inside the second ring body 313 and the third ring body 314. The filter rod unit 32 is respectively installed between the first ring body 311, the second ring body 313, and the third ring body 314 of the fixed ring 31. The fixed ring 31 is rotatably installed inside the support frame 2. The push rod assembly 323 is connected to the pushing ring 316 and the pushing component 312 respectively. The inner part of the ring body 314 is provided with an elastic element 3142. One end of the elastic element 3142 is connected to the push ring 316. The outer walls of the ring body 311, the ring body 313, and the ring body 314 are provided with mounting ports 315 at the positions corresponding to the adjusting rod 322. Both ends of the adjusting rod 322 extend into the mounting ports 315 and are slidably connected to them.

[0040] By adopting the above technical solution, the coaxial ring-type graded transmission system, the pushing component 312, the adjusting rod 322, and related components exhibit significant synergistic advantages. The coaxial nesting of ring one 311, ring two 313, and ring three 314, in conjunction with the fixing rod 321, forms a stable frame, ensuring the smooth operation of the filter rod unit 32. The pushing component 312, in conjunction with the pushing ring 316 and the elastic element two 3142, achieves efficient driving and stable reset. The adjusting rod 322, in conjunction with the mounting port one 315, ensures synchronous and precise adjustment of the filter rod spacing. The pushing ring 316, in conjunction with related sealing and connecting components, ensures smooth sliding, efficient force transmission, and prevents coal dust intrusion.

[0041] The driving assembly 312 includes a drive ring 3121 rotatably mounted inside a ring body 311. A drive ring 3122 is slidably mounted inside the ring body 311 near the drive ring 3121. A wedge-shaped surface 3123 is provided on the side of the drive ring 3122 that is close to the drive ring 3121. A gear ring 3124 is provided on the side of the drive ring 3121 away from the drive ring 3122. A drive gear 3111 is rotatably mounted inside the ring body 311 near the gear ring 3124. A drive motor 3112 is provided outside the ring body 311 near the drive gear 3111. The output end of the drive motor 3112 passes through the ring body 311 and is connected to the drive gear 3111.

[0042] By adopting the above technical solution, drive ring 1 3121 and drive ring 2 3122 work together through wedge surface 3123 to efficiently convert rotational motion into axial displacement; gear ring 1 3124, drive gear 2 3111 and drive motor 2 3112 work together to achieve stable deceleration transmission and precise power output; drive ring 2 3122 and push rod assembly 323 are linked to compensate for axial deviation and stably transmit thrust. The cooperation of each component ensures efficient and smooth power transmission and is suitable for pulverized coal working environment.

[0043] Working principle and usage process of this invention:

[0044] The main frame 1 serves as the installation foundation for the entire device. Its top is connected to the support frame 2 via the buffer assembly 11. The core advantage of this floating connection design is that it can effectively eliminate the vibration and impact generated during coal feeding and screening, avoid rigid vibration of the entire device, thereby reducing wear between components and reducing the probability of rigid collision between coal and device components, preventing excessive crushing of coal. The screening mechanism 3 is rotatably installed inside the support frame 2 and can rotate stably around the axis of the support frame 2, providing continuous and stable power support for the grading and screening of coal.

[0045] The screening mechanism 3 consists of a fixed ring 31 and filter rod units 32. The fixed ring 31 includes a first ring 311, two second rings 313, and a third ring 314 arranged coaxially. The four rings are arranged at intervals, and the filter rod units 32 are installed between the four rings. This arrangement ensures that the filter rod units 32 are distributed in a circular array, which can fully cover the screening area and effectively improve the efficiency and uniformity of coal screening. The two ends of the fixing rods 321 of the filter rod units 32 are fixedly connected to the adjacent rings, which can ensure that the filter rod units 32 are installed firmly and prevent the filter rod units 32 from loosening or shifting due to centrifugal force during screening, thus ensuring the stability of the screening operation.

[0046] An adjusting rod 322 is slidably installed inside the fixed rod 321. A drive groove 3221 is opened on the opposite side of the adjusting rod 322. A push rod assembly 323 is arranged inside the fixed rod 321 between the adjusting rods 322. A push bolt 324 is arranged on the outside of the push rod assembly 323 corresponding to the position of the drive groove 3221. One end of the push bolt 324 is slidably installed inside the drive groove 3221. By moving the push rod assembly 323, the push bolt 324 can be driven to slide in the drive groove 3221, thereby pushing the adjusting rod 322 to extend and retract inside the fixed rod 321. This realizes the flexible adjustment of the spacing between the filter rod units 32, solves the problem of fixed screening particle size and narrow application range of existing screening devices, and can adapt to the screening needs of coal for thermal power generation with different particle sizes.

[0047] The outer walls of ring 1 (311), ring 2 (313), and ring 3 (314) are each provided with mounting openings 315 corresponding to the position of the adjusting rod 322. Both ends of the adjusting rod 322 extend into the mounting openings 315 and slide therein. This structure provides precise guidance for the extension and retraction of the adjusting rod 322, preventing the adjusting rod 322 from deviating and causing uneven adjustment of the filter rod spacing. It also effectively limits the adjusting rod 322, preventing it from falling out of the fixed rod 321, and further ensuring the stability and reliability of the adjustment action. The first ring 311 has a push assembly 312 inside. The second ring 313 and the third ring 314 each have a push ring 316 slidably assembled inside. The push rod assembly 323 is connected to the push ring 316 and the push assembly 312 respectively. The third ring 314 has multiple elastic elements 3142 inside. One end of the elastic element 3142 is connected to the push ring 316. Its core function is to provide reset power for the push ring 316 and the push rod assembly 323, so as to ensure that the filter rod spacing can be stably maintained after adjustment, and at the same time prepare for the subsequent reset action.

[0048] The driving assembly 312 includes a drive ring 3121 rotatably mounted inside a ring body 311. A drive ring 3122 is also slidably mounted inside the ring body 311 near the drive ring 3121. The drive ring 3122 and the drive ring 3121 have wedge-shaped surfaces 3123 on their sides adjacent to the drive ring 3121, and initially, the two wedge-shaped surfaces 3123 are in contact with each other. A toothed ring 3124 is provided on the side of the drive ring 3121 away from the drive ring 3122. The drive ring 3124 is located inside the ring body 311 near the toothed ring 3124. A drive gear 3111 is rotatably mounted at position 24. A drive motor 3112 is located on the outside of the ring 311 near the drive gear 3111. The output end of the drive motor 3112 passes through the ring 311 and is connected to the drive gear 3111. This transmission structure can achieve precise and stable power transmission, ensuring the stable rotation of the drive ring 3121, which in turn drives the drive ring 3122 to move smoothly. This avoids uneven adjustment of the filter rod spacing caused by power transmission jamming and ensures screening accuracy.

[0049] During screening, the spacing between filter rod units 32 is first adjusted according to the particle size requirements of the coal to be screened. Then, drive motor 3112 is started, which drives drive gear 3111 to rotate. When drive gear 3111 rotates, it drives gear ring 3124 to rotate counter-clockwise, which in turn drives drive ring 3121 to rotate synchronously. Because drive ring 3122 is restricted by push rod assembly 323 in filter rod unit 32, it cannot rotate synchronously with drive ring 3121. Therefore, when drive ring 3121 rotates, its wedge-shaped surface 3123 presses against the wedge-shaped surface 3123 on drive ring 3122, causing axial displacement of drive ring 3122. When drive ring 3122 displaces, it pushes the push rod assembly 323 connected to it, which in turn pushes the push rod assembly inside ring body 313. The movement of the moving ring 316 eventually drives the push rod assembly 323 and the pushing ring 316 inside all the ring bodies to move synchronously. When the pushing ring 316 inside the ring body 314 moves, it will squeeze the elastic element 3142. The elastic element 3142 undergoes elastic deformation and stores elastic potential energy, preparing for the subsequent reset of the push rod assembly 323 and the pushing ring 316. At the same time, when the push rod assembly 323 moves, it drives the pushing bolt 324 to move synchronously. The pushing bolt 324 slides in the drive groove 3221 of the adjusting rod 322 and squeezes the inner wall of the drive groove 3221, thereby pushing the adjusting rod 322 to extend out from the fixed rod 321. By controlling the extension length of the adjusting rod 322, the spacing between the filter rod units 32 can be precisely controlled, achieving precise control of the required coal particle diameter, further improving the screening accuracy, and meeting the particle size requirements of coal for thermal power generation.

[0050] After the filter rod spacing is adjusted, the screening action is started. The coal material enters the screening mechanism 3 through the receiving plate. A toothed ring 2 is provided on the outer wall of the ring body 314 of the screening device. A drive motor 1 is provided on the outside of the support frame 2 at the position corresponding to the toothed ring 2. When the drive motor 1 is started, the drive motor 1 drives the drive gear 1 to rotate. The drive gear 1 then drives the toothed ring 2 on the outer wall of the ring body 314 to rotate. The toothed ring 2 drives the entire fixed ring 31 and the filter rod unit 32 to rotate synchronously (with... Figure 1 , Figure 2For example, the screening mechanism 3 rotates counterclockwise. When the screening mechanism 3 rotates, it drives the coal inside to move synchronously. During the rotation, the coal is subjected to the combined action of centrifugal force and gravity. Coal smaller than the spacing of the filter rod unit 32 will fall through the spacing, achieving graded screening. Large pieces of coal or gangue larger than the spacing are left inside the screening mechanism 3 and eventually discharged from the outlet. During this process, the buffer component 11 continuously plays a buffering role, effectively dissipating the vibration generated by the rotation of the screening mechanism 3 and the impact when the coal falls, avoiding loosening and wear of device components caused by vibration, extending the service life of the device, and reducing rigid collisions between the coal and the filter rod unit 32, further reducing the coal breakage rate, ensuring the uniformity of the particle size of the screened coal, and meeting the light-load screening requirements of coal fed into the mill for thermal power generation.

[0051] During the screening process, coal material is prone to getting stuck in the gaps between the filter rod units 32 during feeding and tumbling compression. This not only affects the subsequent screening efficiency, but also causes the coal material stuck in the gaps to impact the remaining coal material when it falls to the highest point as the filter rod unit 32 rotates, resulting in coal material breakage and affecting the subsequent screening quality. To solve this material jamming problem, docking components 21 connected to the support frame 2 are provided on both sides of the screening mechanism 3. The docking components 21 include fixed plates 211 fixedly connected to the support frame 2, and mounting shells 212 are provided between the fixed plates 211. The mounting shell 212 has a docking interface 213 on the side near the screening mechanism 3. An inclined docking block 214 is slidably installed inside the mounting shell 212. One end of the docking block 214 extends into the docking interface 213, and the other end of the docking block 214 is connected to an elastic element 215. One end of the elastic element 215 is connected to the mounting shell 212.

[0052] Under normal conditions, through the continuous pushing of the elastic element 215, one end of the docking block 214 is always located inside the docking interface 213. The outer wall of the fixing rod 321 has a sliding opening 3211 through which the position of the docking interface 213 is provided. The top of the docking bolt 32322 outside the push rod assembly 323 extends through the sliding opening 3211 into the docking assembly 21, ensuring that the docking assembly 21 can accurately dock with the push rod assembly 323, realizing automatic cleaning of jammed materials without manual intervention, and improving the automation level and working efficiency of the device.

[0053] The push rod assembly 323 includes a first rod 3231, a movable block 3232, and a second rod 3233. The movable block 3232 is slidably installed between the first rod 3231 and the second rod 3233 at the position corresponding to the docking assembly 21. The docking bolt 32322 is fixedly connected to the movable block 3232. A limiting groove 32311 is opened at the end of the first rod 3231 near the movable block 3232. A docking slider 32321 is provided on the movable block 3232 at the position corresponding to the limiting groove 32311. The docking slider 32321 is slidably installed inside the limiting groove 32311. This structure can prevent radial displacement when the movable block 3232 slides relative to the first rod 3231, ensuring the stability of power transmission and preventing material jamming or abnormal adjustment of filter rod spacing due to displacement.

[0054] One end of the rod 3233 corresponding to the movable block 3232 has a movable opening 32331. One end of the movable block 3232 is slidably connected to the inner wall of the movable opening 32331. The movable opening 32331 has a first mating surface 32332 and a top surface 32333. The outer wall of the movable block 3232 has a first extrusion surface 32324 corresponding to the first mating surface 32332, and a second extrusion surface 32325 corresponding to the top surface 32333. One side is equipped with an elastic element 32323. In normal operation, the elastic element 32323 pushes the movable block 3232, causing the pressing surface 32324 of the movable block 3232 to fit tightly against the mating surface 32332. Simultaneously, one end of the movable block 3232 engages with the top surface 32333, ensuring a rigid connection between the rod 1 3231, the movable block 3232, and the rod 2 3233. This facilitates stable power transmission, prevents filter rod spacing deviation due to loose connections during screening, and ensures screening accuracy. The other end of the rod 2 3233 is equipped with a butt joint 32334, which contains an elastic element 4 32335. This provides elastic power for the reset of the rod 2 3233, ensuring smooth reset.

[0055] When the filter rod unit 32 rotates with the screening mechanism 3 and approaches a set of docking components 21, the docking bolt 32322 enters the mounting shell 212 through the docking interface 213 and docks with the docking block 214. Due to the high hardness of the elastic element 215 in the docking component 21, the docking block 214 will not be pushed to move during the initial docking stage. At this time, the docking bolt 32322 will push the movable block 3232 to move, first causing one end of the movable block 3232 to separate from the top surface 32333, and the second rod 3233 loses its restraining force. At this time, the fourth elastic element 32335 simultaneously loses its pressure. Push rod 2 3233 moves closer to rod 1 3231; during the movement of rod 2 3233, it drives push bolt 324 to reset. When push bolt 324 resets, it squeezes the inner wall of drive groove 3221, thereby driving adjustment rod 322 to reset and retract into fixed rod 321, making the distance between adjacent filter rod units 32 larger. The coal material stuck in the distance will rise to the highest point with the rotation of screening mechanism 3 and then roll off, effectively solving the problem of material jamming, avoiding the impact of material jamming on subsequent screening efficiency, and preventing secondary crushing caused by the impact of material jamming on other coal materials when it falls, thus ensuring screening quality.

[0056] When the adjusting rod 322 is fully retracted into the fixed rod 321, the movable block 3232 will move to fit against the adjusting rod 322. At this time, the docking bolt 32322 can no longer push the movable block 3232, but instead pushes the docking block 214. Since the docking block 214 is inclined, as the docking bolt 32322 pushes, the docking block 214 will slide upward until the docking bolt 32322 completely passes through the interface 213. Then, the docking block 214 is reset under the action of the elastic element 215, waiting for the next docking. The screening mechanism 3 continues to rotate until the filter rod unit 32 docks with another set of docking components 21. At this time, the docking bolt 32322 docks with the docking block 214 again through the interface 213, and then pushes the docking bolt 32322 to reset in the opposite direction. The docking bolt 32322 drives the movable block 3232 to reset synchronously. 2. During reset, the first pressing surface 32324 presses the first mating surface 32332, causing the second rod 3233 to reset and move. After the movable block 3232 moves a certain distance, the second pressing surface 32325 contacts and presses the top surface 32333 of the second rod 3233, pushing the second rod 3233 to move further. At this time, the first pressing surface 32324 separates from the first mating surface 32332. When one end of the movable block 3232 engages with the top surface 32333 again, the movable block 3232 completes the reset, the first pressing surface 32324 and the first mating surface 32332 are in contact again, and the first rod 3231, the movable block 3232, and the second rod 3233 form a rigid connection again. The filter rod unit 32 returns to the preset spacing and continues the screening operation, realizing the cyclical operation of screening, unblocking, and reset, ensuring the long-term stable operation of the device and reducing manual maintenance costs.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lightweight coal screening device for thermal power generation with a floating screen body connection structure, characterized in that, include: The main frame has a support frame connected to its top via a buffer assembly. A screening mechanism is rotatably mounted inside the support frame. The screening mechanism includes a fixed ring, and several filter rod units parallel to the axis of the fixed ring are arranged in a circular array inside the fixed ring. The filter rod unit includes a fixed rod connected to a fixed ring. An adjusting rod is slidably installed inside the fixed rod. A drive groove is opened on the opposite side of the adjusting rod. A push rod assembly is arranged inside the fixed rod between the adjusting rods. A push bolt is arranged on the outside of the push rod assembly at the position corresponding to the drive groove. One end of the push bolt is slidably installed inside the drive groove. A docking assembly is arranged on the outside of the support frame at the position corresponding to the push rod assembly. A sliding opening is opened through the outer wall of the fixed rod at the position corresponding to the docking assembly. The docking assembly includes a fixed plate fixedly connected to the support frame, and a mounting shell is provided between the fixed plates. The mounting shell has a docking interface on the side near the screening mechanism. An inclined docking block is slidably installed inside the mounting shell. One end of the docking block extends into the docking interface, and the other end of the docking block is connected to an elastic element. One end of the elastic element is connected to the mounting shell. The push rod assembly includes rod one, movable block and rod two. The movable block is slidably installed between rod one and rod two at the position of the corresponding docking assembly. A docking bolt is provided on the top of the movable block. The top of the docking bolt extends through the sliding opening into the interior of the docking assembly. The first rod has a limiting groove at one end near the movable block. The movable block is provided with a docking slider at the position corresponding to the limiting groove. The docking slider is slidably installed inside the limiting groove. The second rod has an opening at one end corresponding to the movable block. One end of the movable block is slidably connected to the inner wall of the opening. The movable opening is provided with a first docking surface and a top surface. The outer wall of the movable block is provided with a first extrusion surface corresponding to the first docking surface. The outer wall of the movable block is provided with a second extrusion surface corresponding to the top surface. An elastic element is provided on one side of the movable block. The other end of the rod is provided with a connector, and the connector is provided with an elastic element.

2. The lightweight coal screening device for thermal power generation with a floating screen body connection structure according to claim 1, characterized in that: The fixed ring includes three ring bodies arranged coaxially: ring body one, ring body two, and ring body three. The two ends of the fixed rod are respectively connected to the adjacent ring bodies. A pushing component is provided inside ring body one. Pushing rings are slidably assembled inside ring body two and ring body three. The filter rod unit is respectively installed between ring body one, ring body two, and ring body three of the fixed ring. The fixed ring is rotatably installed inside the support frame. The push rod assembly is connected to the pushing ring and the pushing component respectively.

3. The lightweight coal screening device for thermal power generation with a floating screen body connection structure according to claim 2, characterized in that: The inner part of the ring body three is provided with an elastic element two. One end of the elastic element two is connected to the push ring. The outer walls of the ring body one, ring body two and ring body three are provided with mounting ports one corresponding to the position of the adjusting rod. Both ends of the adjusting rod extend into the mounting port one and are slidably connected to it.

4. The lightweight coal screening device for thermal power generation with a floating screen body connection structure according to claim 3, characterized in that: The driving assembly includes a drive ring 1 rotatably mounted inside a ring body 1. A drive ring 2 is also slidably mounted inside the ring body 1 near the drive ring 1. The drive ring 2 and the drive ring 1 have wedge-shaped surfaces on their respective sides. A gear ring 1 is provided on the side of the drive ring 1 away from the drive ring 2. A drive gear 2 is rotatably mounted inside the ring body 1 near the gear ring 1. A drive motor 2 is provided on the outside of the ring body 1 near the drive gear 2. The output end of the drive motor 2 passes through the ring body 1 and is connected to the drive gear 2.

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