Environment-friendly coal grinding and screening device for power plant

Abstract

The invention discloses an environment-friendly ground coal screening device for a power plant, relates to the technical field of ground coal powder screening, and solves the technical problems that when an existing ground coal screening device is used, impurities and agglomerates easily block meshes of a screening net, the normal operation efficiency of the screening net is hindered, and the difficulty and complexity of follow-up cleaning work are increased. Comprising a rack, and a stock bin is arranged in the rack; the screening bin is arranged on the top face of the stock bin, a material opening connected with the top face of the stock bin in a matched mode is formed in the bottom face of the screening bin, and an opening is formed in one side face of the screening bin; the conveying mechanism is used for conveying the screened pulverized coal; the screening mechanism comprises a screening net barrel which is obliquely and rotationally arranged in the screening bin and a rotating rod which is rotationally arranged at the top end in the screening bin and located above the screening net barrel; the screening device can prevent impurities and agglomerates from blocking meshes of the screening net, so that the normal operation efficiency of the screening net cylinder is guaranteed, and the difficulty and complexity of subsequent cleaning work are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of coal grinding powder screening, and in particular relates to an environmentally friendly coal grinding screening device for power plants. Background Art

[0002] Coal grinding refers to the process of crushing raw coal and grinding it into coal powder through mechanical or physical methods. The process flow includes multiple links such as raw coal storage and transportation, crushing, grinding, separation and collection, and transportation. It is widely used in industrial fields such as furnace charge, metallurgy, building materials, chemical industry, machinery, etc. It is one of the important raw materials for industrial production and urban heating.

[0003] At present, the working process of the traditional coal grinding and screening device is to introduce the pre-crushed coal powder into a rotating screening mesh cylinder. As the screening mesh cylinder continues to rotate, the coal powder particles try to pass through the dense mesh holes on the mesh cylinder under the action of centrifugal force, while larger impurities and insufficiently crushed coal blocks are intercepted and retained inside the screening mesh cylinder, thereby achieving effective separation of coal powder and impurities;

[0004] However, when using drum screening to process ground coal, since the coal often contains impurities and agglomerates, these substances are easy to clog the mesh of the screening net. Long-term accumulation will not only hinder the normal operation efficiency of the screening net, but also increase the difficulty and complexity of subsequent cleaning work, forcing the cleaning personnel to frequently maintain the screening net, thereby increasing the use cost and maintenance burden of the equipment. Therefore, based on the above problems, we designed an environmentally friendly coal screening device for power plants. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an environmentally friendly coal grinding and screening device for power plants, which solves the technical problem that impurities and agglomerates in the existing coal grinding and screening devices are easy to block the mesh of the screening net during use, hindering the normal operation efficiency of the screening net and increasing the difficulty and complexity of subsequent cleaning work.

[0006] To achieve the above-mentioned object, an environmentally friendly coal grinding and screening device for a power plant is provided according to an embodiment of a first aspect of the present invention, comprising a frame, wherein a silo is arranged in the frame;

[0007] A screening bin is arranged on the top surface of the bin, the bottom surface of the screening bin is provided with a material port which is matched and connected with the top surface of the bin, and one side surface of the screening bin is provided with an opening;

[0008] Conveying mechanism, used for conveying pulverized coal after screening;

[0009] Also includes:

[0010] The screening mechanism includes a screening mesh cylinder which is tiltably and rotatably arranged in the screening bin, a rotating rod which is rotatably arranged at the top of the inner part of the screening bin and located above the screening mesh cylinder, a plurality of eccentric blocks which are equidistantly and fixedly sleeved on the rotating rod, a pair of positioning sleeves which are movably sleeved on the rotating rod, a limiting column which is arranged on the inner wall of the top surface of the screening bin and correspondingly inserted into each positioning sleeve, and a spring which is connected between each positioning sleeve and the inner wall of the screening bin and is respectively sleeved on each limiting column.

[0011] A further improvement is that the conveying mechanism includes a conveying roller rotatably arranged in a bottom port of a frame, a conveyor belt laid on a pair of conveying rollers, a plurality of support rods arranged in the bottom port of the frame for supporting the upper conveyor belt, and a material baffle plate arranged on both sides of the surface of the conveyor belt and respectively connected to the inner wall of the frame.

[0012] A further improvement is that the screening mesh cylinder is divided into a mesh cylinder and a frame body arranged in ports on both sides of the mesh cylinder, each of the frames is provided with three frame rods, and a feed port is formed between every two adjacent frame rods.

[0013] A further improvement is that the screening mechanism also includes a pair of cleaning roller brushes symmetrically rotatably arranged in the screening bin, each of the cleaning roller brushes is provided with a detachable brush wire sleeve, the brush wire sleeve is covered with brush wires, and the brush wires are in contact with the screening mesh cylinder.

[0014] A further improvement is that the screening mechanism also includes a single driving wheel and a group of pulleys rotatably arranged on the outer wall of the screening bin and connected together by belts, the driving wheel is connected to the screening mesh cylinder, and the group of pulleys are respectively connected to each cleaning roller brush and the rotating rod.

[0015] A further improvement is that a material guiding device is additionally provided, which includes a fixed frame connected to the side of the frame, a material guiding hopper connected to the fixed frame, and a curved material guiding channel sleeved on the discharge port on the bottom surface of the material guiding hopper, the other end of the curved material guiding channel faces the feed port, and the curved material guiding channel is rotatably provided with a pair of rotating columns at one end of the discharge port of the material guiding hopper, each rotating column is sleeved with a number of material guiding plates, and the outer wall of the material guiding hopper is rotatably provided with a pair of linkage gears connected to each rotating column.

[0016] A further improvement is that the bottom discharge port of the guide hopper is designed to be arc-shaped, and when each rotating column rotates, each guide plate rotates and contacts the arc edge of the discharge port.

[0017] A further improvement is that an extrusion device is additionally provided, which includes a material plate in an inverted eight-shaped shape arranged on the bottom surface of the silo, a pair of extrusion rollers rotatably arranged in the port on the bottom surface of the silo, and a pair of gears rotatably arranged outside the silo and connected to each extrusion roller.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention puts the material into the guide hopper, and the material is then guided to the rotating column and naturally distributed between two adjacent guide plates. Subsequently, driven by the reducer, the rotating column starts to rotate, and this action causes the material between the adjacent guide plates to fall into the curved guide channel in an intermittent manner. These materials then flow smoothly into the screening mesh cylinder through each feed port. At the same time, the continuous rotation of the screening mesh cylinder ensures the continuous supply of materials and the efficient coordination of the screening process.

[0020] (2) In the present invention, during the rotation of the screening mesh cylinder, the rotating rod installed on the top thereof and the eccentric blocks evenly distributed thereon rotate synchronously through the drive of the belt. The rotation of the eccentric blocks, in cooperation with the positioning sleeve sliding along the limit column and compressing the spring, effectively slows down the overall vibration amplitude and ensures the stability of the operation process. At the same time, a pair of cleaning roller brushes arranged on both sides of the screening mesh cylinder also rotate accordingly. This ingenious design achieves a double cleaning effect: on the one hand, the eccentric blocks strike the surface of the screening mesh cylinder in a uniform reciprocating manner, effectively preventing the clogging of the mesh by impurities and agglomerates; on the other hand, the brush wires on the cleaning roller brushes penetrate into the gaps and meshes of the screening mesh cylinder to brush away any residual materials, further ensuring the screening efficiency and significantly reducing the difficulty and tediousness of subsequent cleaning work.

[0021] (3) In the present invention, the powder materials after screening are first deposited smoothly at the bottom of the silo. Then, the powder materials slide smoothly along the guide of the material plate to a pair of carefully designed extrusion rollers. When the reducer 4 is started, its output shaft drives a pair of mutually meshing gears to rotate in opposite directions. This power is transmitted to the extrusion rollers, so that they can effectively re-extrude and crush the lumps that may remain in the powder materials. This process ensures the uniformity and fineness of the powder materials, thereby significantly improving the quality and efficiency of the overall coal grinding production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the longitudinal section side view of the present invention;

[0024] Figure 3 It is a schematic diagram of the longitudinal section of the present invention;

[0025] Figure 4 It is a schematic diagram of the side structure of the silo and the screening silo of the present invention;

[0026] Figure 5 It is a front structural schematic diagram of the material guiding device of the present invention.

[0027] Markings in the figure:

[0028] 1. Conveying mechanism; 11. Conveying roller; 12. Conveying belt; 13. Support rod; 2. Frame; 21. Material bin; 22. Screening bin; 221. Opening; 3. Screening mechanism; 31. Driving wheel; 311. Pulley; 32. Rotating rod; 321. Eccentric block; 33. Cleaning roller brush; 331. Brush wire sleeve; 34. Screening net cylinder; 341. Net cylinder; 342. Frame; 301. Positioning sleeve; 302. Limiting column; 303. Spring; 304. Feed inlet; 4. Material guiding device; 41. Material guiding hopper; 42. Curved material guiding channel; 43. Rotating column; 44. Material guiding plate; 45. Fixed frame; 46. Linkage gear; 5. Extruding device; 51. Material plate; 52. Extruding roller; 53. Gear. DETAILED DESCRIPTION

[0029] The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 and Figure 3 As shown, an environmentally friendly coal grinding and screening device for a power plant includes a frame 2, in which a silo 21 is arranged;

[0031] The screening bin 22 is arranged on the top surface of the silo 21. The bottom surface of the screening bin 22 is provided with a material port that cooperates with the top surface of the silo 21. One side surface of the screening bin 22 is provided with an opening 221.

[0032] Conveying mechanism 1, used for conveying pulverized coal after screening;

[0033] Specifically, the conveying mechanism 1 includes a conveying roller 11 rotatably arranged in the bottom surface port of the frame 2, a conveying belt 12 laid on a pair of conveying rollers 11, a plurality of support rods 13 arranged in the bottom end port of the frame 2 for supporting the upper conveying belt 12, and baffle plates 14 arranged on both sides of the surface of the conveying belt 12 and respectively connected to the inner wall of the frame 2. The conveying roller 11 is driven by a reducer 1 externally arranged on the frame 2, so that the conveying roller 11 drives the conveying belt 12 to rotate and convey the screened powder;

[0034] like Figures 2 to 4As shown, when implemented, it includes: a screening mechanism 3, which includes a screening mesh cylinder 34 that is tilted and rotatably arranged in the screening bin 22, a rotating rod 32 that is rotatably arranged at the top of the inner part of the screening bin 22 and located above the screening mesh cylinder 34, a plurality of eccentric blocks 321 that are equidistantly fixedly sleeved on the rotating rod 32, a pair of positioning sleeves 301 that are movably sleeved on the rotating rod 32, a limiting column 302 that is arranged on the inner wall of the top surface of the screening bin 22 and correspondingly inserted in each positioning sleeve 301, and a spring 303 that is connected between each positioning sleeve and the inner wall of the screening bin and is respectively sleeved on each limiting column 302. By cooperating with the positioning sleeve 301 to slide along the limiting column 302 and compress the spring 303, the overall vibration amplitude is effectively reduced, thereby ensuring the stability of the operation process;

[0035] Specifically, the screening net cylinder 34 is divided into a net cylinder 341 and a frame 342 disposed in ports on both sides of the net cylinder 341. Three frame rods are disposed in each frame 342. A feed port 304 is formed between each two adjacent frame rods. Each feed port 304 is used for feeding.

[0036] Specifically, the screening mechanism 3 also includes a single driving wheel 31 and a group of pulleys 311 that are rotatably arranged on the outer wall of the screening bin 22 and connected together by a belt. The driving wheel 31 is connected to the screening net cylinder 34, and a group of pulleys 311 are respectively connected to each cleaning roller brush 33 and the rotating rod 32. The driving wheel 31 is driven by a reducer 2 connected to the outside of the screening bin 22. During the rotation of the screening net cylinder 34, the rotating rod 32 installed on the top thereof and the eccentric blocks 321 evenly distributed thereon rotate synchronously through the drive of the belt. The rotation of the eccentric block 321, in cooperation with the mechanism of the positioning sleeve 301 sliding along the limit column 302 and compressing the spring 303, effectively reduces the overall vibration amplitude and ensures the stability of the operation process;

[0037] As a preferred embodiment, the screening mechanism 3 also includes a pair of cleaning roller brushes 33 symmetrically rotatably arranged in the screening bin 22, each cleaning roller brush 33 is provided with a detachable brush wire sleeve 331, the brush wire sleeve 331 is covered with brush wires, the brush wires are in contact with the screening mesh cylinder 34, and the pulley 311 and the driving wheel 31 are driven by the second reducer, so that the pair of cleaning roller brushes 33 arranged on both sides of the screening mesh cylinder 34 also rotate accordingly. This ingenious design achieves a double cleaning effect: on the one hand, the eccentric block 321 strikes the surface of the screening mesh cylinder 34 in a uniform reciprocating manner, effectively preventing the clogging of the mesh by impurities and agglomerates; on the other hand, the brush wires on the cleaning roller brush 33 penetrate into the gaps and meshes of the screening mesh cylinder 34 to brush away possible residual materials, further ensuring the screening efficiency and significantly reducing the difficulty and tediousness of subsequent cleaning work;

[0038] like Figure 3 and Figure 5As shown, the present embodiment is further provided with a material guide device 4, which includes a fixing frame 45 connected to the side of the frame 2, a material guide hopper 41 connected to the fixing frame 45, and a curved material guide channel 42 sleeved on the discharge port of the bottom surface of the material guide hopper 41, the other end of the curved material guide channel 42 faces the feed port 304, and the curved material guide channel 42 is rotatably provided with a pair of rotating columns 43 at one end of the discharge port of the material guide hopper 41, and each rotating column 43 is sleeved with a plurality of material guide plates 44, and the outer wall of the material guide hopper 41 is rotatably provided with a pair of rotating columns 43. A pair of linkage gears 46 connected to each rotating column 43 is arranged. The bottom discharge port of the guide hopper 41 is designed to be arc-shaped. When each rotating column 43 rotates, each guide plate 44 rotates and contacts the arc edge of the discharge port. A reducer three is connected to the outer side of the curved guide channel 42. The output spindle of the reducer three is connected to the linkage gear 46, which is used to drive the pair of rotating columns 43 to rotate. By putting the material into the guide hopper 41, the material is immediately guided to the rotating column 43 and naturally distributed between two adjacent guide plates 44. Subsequently, driven by the reducer one, the rotating column 43 starts to rotate. This action causes the material between the adjacent guide plates 44 to fall into the curved guide channel 42 in an intermittent manner. These materials then flow smoothly into the screening mesh cylinder 34 through each feed port 304. At the same time, the continuous rotation of the screening mesh cylinder 34 ensures the continuous supply of materials and the efficient coordination of the screening process;

[0039] like Figures 1 to 3 As shown, in this embodiment, an extrusion device 5 is also provided, which includes a material plate 51 arranged in an inverted eight-shaped shape on the bottom surface of the silo 21, a pair of extrusion rollers 52 rotatably arranged in the bottom surface port of the silo 21, and a pair of gears 53 rotatably arranged outside the silo 21 and connected to each extrusion roller 52. The gears 53 are driven by a reducer 4 externally arranged on the frame 2. The powder material after screening is first deposited smoothly at the bottom of the silo 21. Subsequently, the powder material slides smoothly between a pair of carefully designed extrusion rollers 52 along the guidance of the material plate 51. When the reducer 4 is started, its output shaft drives a pair of mutually meshing gears 53 to rotate in opposite directions. This power is transmitted to the extrusion rollers 52, so that they can effectively re-extrude and crush the lumps that may remain in the powder material. This process ensures the uniformity and fineness of the powder material.

[0040] like Figures 1 to 5As shown, in this embodiment, a control box is configured before the application document is implemented. The control box is used to control each reducer individually, and a power box is configured to provide power to the control box. In order to avoid dust from the powder, this embodiment uses a duct to feed the material when conveying the feed. When the conveying mechanism 1 is conveying, a shield is added. It should be noted that this application document only improves the shortcomings of the existing coal grinding and screening device, which is that impurities and agglomerates easily clog the mesh of the screening net during use, hindering the normal operating efficiency of the screening net, and increasing the difficulty and complexity of subsequent cleaning work. It does not involve other aspects. The working principle of this environmentally friendly coal grinding and screening device for power plants is introduced as follows:

[0041] When the present invention is used:

[0042] First, the on-site operator puts the material into the guide hopper 41, and the material is then guided to the rotating column 43 and naturally distributed between two adjacent guide plates 44. Then, driven by the reducer 1, the rotating column 43 starts to rotate, and this action causes the material between the adjacent guide plates 44 to fall into the curved guide channel 42 in an intermittent manner. These materials then flow smoothly into the screening mesh cylinder 34 through each feed port 304. At the same time, the continuous rotation of the screening mesh cylinder 34 ensures the continuous supply of materials and the efficient coordination of the screening process.

[0043] Next, the second reducer is started to drive the screening mesh drum 34, the driving wheel 31 and a set of pulleys 311 to rotate, so that the coal powder particles pass through the dense mesh holes on the screening mesh drum 34 under the action of centrifugal force, while larger impurities and insufficiently crushed coal blocks are intercepted and retained inside the screening mesh drum 34, thereby achieving effective separation of coal powder and impurities.

[0044] During the rotation of the screening mesh cylinder 34, the rotating rod 32 installed on the top thereof and the eccentric blocks 321 evenly distributed thereon rotate synchronously through the drive of the belt. The rotation of the eccentric blocks 321, in cooperation with the sliding of the positioning sleeve 301 along the limit column 302 and the compression of the spring 303, effectively slows down the overall vibration amplitude and ensures the stability of the operation process. At the same time, a pair of cleaning roller brushes 33 arranged on both sides of the screening mesh cylinder 34 also rotate accordingly. This ingenious design achieves a double cleaning effect: on the one hand, the eccentric blocks 321 strike the surface of the screening mesh cylinder 34 in a uniform reciprocating manner, effectively preventing the impurities and agglomerates from clogging the mesh; on the other hand, the brush wires on the cleaning roller brushes 33 penetrate into the gaps and meshes of the screening mesh cylinder 34 to brush away possible residual materials, further ensuring the screening efficiency and significantly reducing the difficulty and tediousness of subsequent cleaning work.

[0045] The powder after screening is first deposited smoothly at the bottom of the silo 21. Then, the powder slides smoothly along the guide of the material plate 51 to a pair of carefully designed extrusion rollers 52. When the reducer 4 is started, its output shaft drives a pair of meshing gears 53 to rotate in opposite directions. This power is transmitted to the extrusion rollers 52, so that they can effectively re-extrude and crush the lumps that may remain in the powder. This process ensures the uniformity and fineness of the powder, thereby significantly improving the quality and efficiency of the overall coal grinding production.

[0046] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An environmentally friendly coal grinding and screening device for a power plant, comprising a frame (2), wherein a silo (21) is arranged in the frame (2); A screening bin (22) is arranged on the top surface of the silo (21); the bottom surface of the screening bin (22) is provided with a material port that is matched and connected to the top surface of the silo (21); and one side surface of the screening bin (22) is provided with an opening (221); A conveying mechanism (1) for conveying the screened coal powder; It is characterized in that Also includes: A screening mechanism (3), the screening mechanism (3) comprising a screening net cylinder (34) arranged in a screening bin (22) and arranged to rotate in an inclined manner, a rotating rod (32) arranged to rotate at the top of the inside of the screening bin (22) and located above the screening net cylinder (34), a plurality of eccentric blocks (321) equidistantly fixedly sleeved on the rotating rod (32), a pair of positioning sleeves (301) movably sleeved on the rotating rod (32), a limiting column (302) arranged on the inner wall of the top surface of the screening bin (22) and correspondingly inserted into each positioning sleeve (301), and a spring (303) connected between each positioning sleeve and the inner wall of the screening bin and sleeved on each limiting column (302).

2. The environmentally friendly coal grinding and screening device for power plants according to claim 1 is characterized in that: The conveying mechanism (1) comprises a conveying roller (11) rotatably arranged in a bottom surface port of a frame (2), a conveying belt (12) laid on a pair of conveying rollers (11), a plurality of support rods (13) arranged in the bottom end port of the frame (2) for supporting the upper conveying belt (12), and baffle plates (14) arranged on both sides of the surface of the conveying belt (12) and respectively connected to the inner wall of the frame (2).

3. The environmentally friendly coal grinding and screening device for power plants according to claim 1 is characterized in that: The screening net cylinder (34) is divided into a net cylinder (341) and a frame body (342) arranged in ports on both sides of the net cylinder (341). Three frame rods are arranged in each frame body (342), and a feed port (304) is formed between every two adjacent frame rods.

4. The environmentally friendly coal grinding and screening device for power plants according to claim 1 is characterized in that: The screening mechanism (3) further comprises a pair of cleaning roller brushes (33) symmetrically rotatably arranged in the screening bin (22), each of the cleaning roller brushes (33) being provided with a detachable brush wire sleeve (331), the brush wire sleeve (331) being covered with brush wires, and the brush wires are in contact with the screening mesh cylinder (34).

5. The environmentally friendly coal grinding and screening device for power plants according to claim 4, characterized in that: The screening mechanism (3) further comprises a single driving wheel (31) and a group of pulleys (311) which are rotatably arranged on the outer wall of the screening bin (22) and are connected to each other via a belt, wherein the driving wheel (31) is connected to the screening net cylinder (34), and the group of pulleys (311) is respectively connected to each cleaning roller brush (33) and the rotating rod (32).

6. The environmentally friendly coal grinding and screening device for power plants according to claim 1 is characterized in that: A material guiding device (4) is also provided, the material guiding device (4) comprising a fixed frame (45) connected to the side of the frame (2), a material guiding hopper (41) connected to the fixed frame (45), and a curved material guiding channel (42) sleeved on the discharge port on the bottom surface of the material guiding hopper (41), the other end of the curved material guiding channel (42) facing the feed port (304), the curved material guiding channel (42) being rotatably provided with a pair of rotating columns (43) at one end of the discharge port of the material guiding hopper (41), each rotating column (43) being sleeved with a plurality of material guiding plates (44), and the outer wall of the material guiding hopper (41) being rotatably provided with a pair of linkage gears (46) connected to each rotating column (43).

7. The environmentally friendly coal grinding and screening device for power plants according to claim 6, characterized in that: The bottom discharge port of the guide hopper (41) is designed to be arc-shaped. When each rotating column (43) rotates, each guide plate (44) rotates and contacts the arc edge of the discharge port.

8. The environmentally friendly coal grinding and screening device for power plants according to claim 1, characterized in that: A material extrusion device (5) is also provided, the material extrusion device (5) comprising a material plate (51) arranged on the bottom surface of the material bin (21) in an inverted eight-shaped shape, a pair of material extrusion rollers (52) rotatably arranged in a port on the bottom surface of the material bin (21), and a pair of gears (53) rotatably arranged outside the material bin (21) and connected to each of the material extrusion rollers (52).

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