Clean pulverized coal refining device
By designing a special structure for the upper and lower grinding discs and an airflow system, the problem of pre-processing larger coal blocks in vertical coal pulverizers was solved, improving coal grinding efficiency and reducing the number of cyclic grinding cycles, thus achieving efficient coal powder refinement.
Patent Information
- Application Number
- CN202520444861.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing vertical coal pulverizers cannot pre-crush larger coal blocks, which affects the coal grinding efficiency and increases the number of coal pulverizer cycles.
A clean coal powder refining device was designed, which adopts a special structure of upper and lower grinding discs to pre-crush larger coal blocks before they enter the grinding rollers, and then classifies, screens and circulates the coal powder through an airflow system to reduce the number of times the coal powder is circulated and ground.
It improves the efficiency of coal powder grinding, reduces the number of coal powder circulation grinding times, increases the grinding efficiency of the grinding rollers, and achieves efficient coal powder classification and screening through the airflow system.
Smart Images
Figure CN223945776U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of coal powder refining equipment, in particular to a clean coal powder refining device. BACKGROUND
[0002] Coal powder refining is an important link in coal processing, when coal powder is transported through a pipeline, the refined coal powder can flow more smoothly in the pipeline, reducing the risk of blocking the pipeline, the refined coal powder has a larger surface area, the area of unit mass of coal powder in contact with oxygen will increase significantly, thereby greatly improving the combustion speed and combustion efficiency.
[0003] The common vertical coal powder grinding machine is through the rotation of the grinding disc, so that the material is crushed between the grinding disc and the grinding roller. At the same time, there is an air flow system inside the equipment to take away the crushed fine powder, and the coarse particles continue to be ground on the grinding disc. The material entering between the grinding disc and the grinding roller needs to be pretreated into smaller coal blocks in advance, if larger coal blocks enter, the coal powder grinding efficiency will be reduced, and the number of cycles of grinding coarse particle coal powder will also be increased, which needs to be further improved. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a clean coal powder refining device, solving the problems that the existing vertical coal powder grinding machine cannot be pre-crushed before the coal block contacts the grinding roller when larger coal blocks enter, affecting the coal powder grinding efficiency, increasing the number of cycles of grinding coal powder, etc.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of:
[0006] A clean coal powder refining device, including a grinding bin, the grinding bin provides power output for coal powder grinding through a power mechanism below, and classifies and screens coal powder particles through a classification bin above, coal blocks in the grinding bin enter through a feeding cylinder, the grinding bin includes a lower grinding disc and an upper grinding disc corresponding vertically, the lower grinding disc is fixed with a transmission shaft at the bottom, the transmission shaft is driven to rotate through a power mechanism installed at the bottom, the grinding bin is connected with an air inlet, the lower grinding disc includes a rotating disc, a convex block and a grinding roller groove, the rotating disc is fixed with the transmission shaft at the bottom, and the top is integrally formed with a semicircular convex block, a ring-shaped grinding roller groove is opened on the top surface of the rotating disc near the outer circle, the upper grinding disc includes a fixed disc, a round port, a grinding roller and a ventilation hole, the fixed disc is fixed with the inner wall of the grinding bin, the top surface of the fixed disc is high in the center and low around, the bottom surface is low in the center and high around, the fixed disc is provided with a round port in the center, the bottom of the feeding cylinder is located above the round port, a plurality of grinding rollers are installed on the bottom of the fixed disc near the outer circle, the bottom of the grinding roller rolls along the grinding roller groove, and the fixed disc is provided with a ventilation hole penetrating up and down on the outer circle, so that the grinding bin and the classification bin are communicated.
[0007] Preferably, the outer circumferential end of the rotating disc is integrally formed with an upward powder accumulation flange.
[0008] Preferably, the grading bin comprises a grading cylinder, a filtering cylinder, a grading motor and an air outlet, the grading cylinder is fixed on the top of the fixed disc and is spaced from the inner wall of the grading bin, the filtering cylinder is coaxially arranged inside the grading cylinder, the top of the filtering cylinder is open and the top surface is closed with the top inner wall of the grading bin, the grading motor is fixed on the top surface of the grading bin and the output end is fixed with the filtering cylinder, and the filtering cylinder is provided with the air outlet.
[0009] Preferably, the grading cylinder comprises a fixed cylinder, the fixed cylinder is fixed on the top of the fixed disc and a plurality of circulating feeding ports are formed on the circumference of the connection part between the fixed cylinder and the fixed disc.
[0010] Preferably, an inwardly inclined annular air flow baffle is fixed on the top surface of the fixed disc outside the fixed cylinder and inside the air vent.
[0011] Preferably, the filtering cylinder comprises a rotating cylinder, a connecting rod and a filter screen, the top of the rotating cylinder is fixed with the output shaft of the grading motor through the connecting rod, and the bottom is fixed with the filter screen.
[0012] Preferably, a fixed rod is fixed radially inside the fixed cylinder, a scraper is fixed on the top of the fixed rod, and the scraper is in contact with the bottom surface of the filter screen.
[0013] Preferably, a one-way valve is installed above the feeding cylinder.
[0014] Preferably, a speed reduction motor is fixed outside the power mechanism, and the speed reduction motor is connected with the transmission shaft through the belt pulley set inside the power mechanism.
[0015] Preferably, a receiving plate is fixed below the grinding bin, the transmission shaft is connected with the receiving plate through a bearing, and a material taking window with a sealing plate is arranged on the outer wall of the grinding bin above the receiving plate.
[0016] The utility model has the following beneficial effects:
[0017] 1. The middle gap between the upper grinding disc and the lower grinding disc is large, and the peripheral gap is small, so that large coal blocks enter from the round port of the upper grinding disc, the rotation of the rotating disc of the lower grinding disc makes the coal blocks and the fixed disc of the upper grinding disc grind each other, the effect of the convex hull makes the coal block particles move to the periphery and become smaller and smaller, the large coal blocks are pre-processed into small coal blocks before entering the grinding roller for grinding, the grinding efficiency of the grinding roller is increased, and the number of coal powder circulation grinding is reduced.
[0018] 2. The top surface of the upper grinding disc is high at the periphery and low at the center, so that the large particles of coal powder falling from the top surface of the upper grinding disc can slide to the round port under the action of gravity, and the coal powder is conveniently ground into small particles. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 is the schematic diagram of the appearance structure of the utility model;
[0020] Figure 2 is the longitudinal sectional view of the utility model;
[0021] Figure 3 is the axial side schematic diagram of the lower grinding disc sectional view of the utility model;
[0022] Figure 4 is the axial side schematic diagram of the upper grinding disc sectional view of the utility model;
[0023] Figure 5 is the longitudinal sectional view of the upper grinding disc and lower grinding disc connecting position of the utility model;
[0024] Figure 6 is the schematic diagram of the filter cylinder structure of the utility model;
[0025] Figure 7 is the schematic diagram of the airflow direction of the utility model.
[0026] Icon: 1, grinding bin; 11, lower grinding disc; 111, rotating disc; 112, convex hull; 113, grinding roller groove; 114, accumulated powder folding edge; 12, upper grinding disc; 121, fixed disc; 122, round port; 123, grinding roller; 124, air hole; 125, airflow baffle; 13, transmission shaft; 14, air inlet; 15, material receiving plate; 16, bearing; 17, material taking window; 2, power mechanism; 21, speed reduction motor; 22, belt pulley set; 3, grading bin; 31, grading cylinder; 311, fixed cylinder; 312, circulating feed inlet; 313, fixed rod; 314, scraper; 32, filter cylinder; 321, rotating cylinder; 322, connecting rod; 323, filter screen; 33, grading motor; 34, air outlet; 4, feed cylinder; 41, check valve. DETAILED DESCRIPTION
[0027] The embodiment of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.
[0028] In the description of the utility model, it needs to be explained that unless there is explicit provision and limitation, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0029] AsFigures 1-7 As shown in the present embodiment, a cleaning coal powder refining device, including a grinding bin 1 for grinding coal blocks into powder, the grinding bin 1 is powered by the power mechanism 2 below to provide the power output of the coal powder grinding, the coal powder particles are classified by the upward blowing way of the gas to the classification bin 3 above, the coal blocks in the grinding bin 1 enter through the feeding cylinder 4, the top end of the feeding cylinder 4 is located outside the grinding bin 1, the coal blocks slide down to the grinding bin 1 by gravity, the grinding bin 1 includes a vertically corresponding lower grinding disc 11 and an upper grinding disc 12, the coal blocks are ground into coal powder by the friction between the lower grinding disc 11 and the upper grinding disc 12, the bottom of the lower grinding disc 11 is fixed with a transmission shaft 13, the transmission shaft 13 is driven to rotate by the power mechanism 2 installed at the bottom, the grinding bin 1 is connected with an air inlet 14, the air inlet 14 blows by the external air compressor or fan and the like, the ground coal powder is driven into the power mechanism 2 by the upward gas to be discharged after classification, the lower grinding disc 11 includes a rotating disc 111, a convex block 112 and a grinding roller groove 113, the bottom of the rotating disc 111 is fixed with the transmission shaft 13, the top is integrally formed with a semicircular convex block 112, so that the coal blocks falling on the rotating disc 111 slide to the periphery through the convex block 112, the top surface of the rotating disc 111 is provided with annular grinding roller grooves 113 near the outer periphery, the upper grinding disc 12 includes a fixed disc 121, a round port 122, a grinding roller 123 and a vent hole 124, the fixed disc 121 is fixed with the inner wall of the power mechanism 2, so that the coal blocks between the rotating disc 111 and the fixed disc 121 produce friction when the rotating disc 111 rotates, the top surface of the fixed disc 121 is high at the periphery and low at the center, the bottom surface is low at the periphery and high at the center, the middle gap between the fixed disc 121 and the rotating disc 111 is large, and the peripheral gap is small, through this structure, the large coal blocks entering the middle of the rotating disc 111 can be diffused to the periphery after being ground into small particles, the fixed disc 121 is provided with a round port 122 at the center, the bottom of the feeding cylinder 4 is located above the round port 122, which facilitates the coal blocks to fall from the round port 122 to the convex block 112 of the rotating disc 111, and also facilitates the large coal powder particles falling with the upward airflow to enter the round port 122 to form a cycle, a plurality of grinding rollers 123 are installed at the bottom of the fixed disc 121 near the outer periphery, the bottom of the grinding roller 123 rolls along the grinding roller groove 113, so that the small particles of the large particles between the rotating disc 111 and the fixed disc 121 are ground into powder by the grinding roller 123, the grinding efficiency of the grinding roller 123 is increased, and the number of coal powder circulation grinding is reduced, the fixed disc 121 is provided with upper and lower vent holes 124 outside the periphery, so that the grinding bin 1 and the classification bin 3 are communicated, so as to facilitate the upward flow of the ground coal powder by the upward airflow.
[0030] Further, the rotating disc 111 is integrally formed with an upward powder accumulation flange 114 at the outer circumferential end. The powder accumulation flange 114 can block the coal powder after being ground by the grinding roller 123, increase the contact times between the coal block and the grinding roller 123, increase the refinement degree of the coal powder ground by the grinding roller 123, improve the coal powder forming efficiency, and avoid the coal powder from being taken away by the airflow at the first time when the coal powder just comes out of the grinding roller groove 113, and reduce the number of coal powder circulation grinding times.
[0031] Specifically, the grading bin 3 includes a grading cylinder 31, a filtering cylinder 32, a grading motor 33, and an air outlet 34. The grading cylinder 31 is fixed on the top of the fixed disc 121 and has a space with the inner wall of the grading bin 3, so that the gas can flow along the outside of the grading cylinder 31 and the inner wall of the grading bin 3 to plan the gas flow direction, and the larger particles of the coal powder can be screened out and naturally fall off due to the gravity rising to a specified height, so as to avoid the gas flow from directly contacting the coal block which has not been ground and affecting the falling path of the coal block. The filtering cylinder 32 is located inside the coaxial center of the grading cylinder 31. The filtering cylinder 32 is open at the top and the top surface is closed with the inner wall of the top of the grading bin 3. The grading motor 33 is fixed on the top surface of the grading bin 3 and the output end is fixed with the filtering cylinder 32. The filtering cylinder 32 is driven to rotate by the grading motor 33, so that the larger particles can be rotated and knocked off when they cannot pass through the filtering cylinder 32, to avoid being blocked on the surface of the filtering cylinder 32. The air outlet 34 is arranged outside the filtering cylinder 32 and the grading bin 3, so that the qualified coal powder can be discharged from the top air outlet 34 in the filtering cylinder 32 and collected.
[0032] Specifically, the grading cylinder 31 includes a fixed cylinder 311 fixed on the top of the fixed disc 121, and a plurality of circulating feeding ports 312 are arranged at the circumference of the connection between the fixed cylinder 311 and the fixed disc 121. The larger particles of the coal powder falling on the top surface of the fixed disc 121 outside can slide down to the circular port 122 through the circulating feeding port 312 to form a circulating grinding.
[0033] Further, the fixed cylinder 311 outside the top surface of the fixed disc 121 is fixed with an inwardly inclined annular airflow baffle 125 at a position inside the air hole 124. The annular airflow baffle 125 is inwardly inclined and has a height higher than the circulating feeding port 312, so as to ensure that the gas flow passes between the fixed cylinder 311 and the grading bin 3, reduce the gas flow passing through the circulating feeding port 312 from outside to inside, and avoid affecting the screening effect of the coal powder.
[0034] Specific, the filter cartridge 32 includes rotating cylinder 321, connecting rod 322, filter screen 323, the rotating cylinder 321 top is fixed with the output shaft of the classification motor 33 through connecting rod 322, the bottom is fixed with filter screen 323. The height of filter screen 323 is lower than the height of fixed cylinder 311, so that the airflow forms S shape at the top of classification bin 3, further makes the larger coal powder particles fall by gravity, and the fine coal powder meeting the diameter of filter screen 323 passes through the bottom filter screen 323 and enters the rotating cylinder 321, so that the coal powder in the rotating cylinder 321 is discharged through the air outlet 34 and collected.
[0035] Further, the fixed rod 313 is fixed radially in the fixed cylinder 311, the top of the fixed rod 313 is fixed with the scraper 314, and the scraper 314 is in contact with the bottom surface of the filter screen 323. Through the rotation of the fixed cylinder 311, the scraper 314 can scrape the coal powder particles adhered to the bottom surface of the filter screen 323, avoid the blockage of the filter screen 323 caused by long-time use, and reduce the cleaning frequency.
[0036] Further, the one-way valve 41 is installed above the feeding cylinder 4, which avoids the coal powder from being blown out of the feeding cylinder 4 due to gas flow.
[0037] Specifically, the power mechanism 2 is externally fixedly installed with a speed reducer motor 21, the speed reducer motor 21 is connected with the transmission shaft 13 through the belt pulley set 22 in the power mechanism 2, drives the transmission shaft 13 to rotate, and provides rotating power for the rotating disc 111.
[0038] Further, the receiving plate 15 is sealingly fixed below the grinding bin 1, so that the coal powder or coal block falling to the bottom of the grinding bin 1 can be collected through the receiving plate 15, the transmission shaft 13 is connected with the receiving plate 15 through the bearing 16, and the outer wall of the grinding bin 1 above the receiving plate 15 is provided with the material taking window 17 with a sealing plate, so that the staff can take out the coal powder or coal block accumulated on the receiving plate 15 through the material taking window 17.
[0039] The working principle of the utility model is:
[0040] The grinding process is as follows: the coal block slides from the feeding cylinder 4 to the round port 122 of the upper grinding disc 12, the convex block 112 structure of the lower grinding disc 11 makes the coal block slide to the periphery, the rotating disc 111 is indirectly driven by the speed reducer motor 21, the middle gap between the upper grinding disc 12 and the lower grinding disc 11 is large, and the gap around is small, the coal block particles move to the periphery and become smaller and smaller, so that the coal block is preprocessed into a smaller coal block before entering the grinding roller 123 for grinding, the smaller coal block enters the grinding groove 113 and is ground into coal powder by the grinding roller 123, and is blocked by the powder accumulation folding edge 114, so that the fineness of the ground coal powder is increased.
[0041] Gas classification screening process: gas enters through the gas inlet 14, the gas rises to the powder accumulation folded edge 114 to overflow the coal powder into the classification bin 3 through the air hole 124, the gas flow baffle 125 guides the gas with the coal powder to rise between the fixed cylinder 311 and the inner wall of the classification bin 3 to the top of the fixed cylinder 311, at this time, the larger coal powder particles cannot rise to the specified height due to the larger mass, and fall under the action of gravity, the remaining coal powder particles sink to the filter screen 323 through the top of the fixed cylinder 311, at this time, the larger coal powder particles are screened and fall again, and the coal powder that does not meet the particle diameter is blocked outside the filter screen 323 and is scraped off by the scraper 314, the fine coal powder that meets the diameter enters through the filter screen 323 into the rotating cylinder 321 and is discharged from the gas outlet 34 to be collected.
[0042] Coal powder circulating grinding process: when the coal powder screened out by the gas falls on the fixed disc 121, the coal powder is made to slide to the round port 122 through the inwardly inclined structure on the top surface of the fixed disc 121 to continue the circulating grinding, the coal powder falling on the material receiving plate 15 is collected through the material taking window 17 and is introduced from the feeding cylinder 4 to form the circulating grinding.
[0043] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A clean coal powder refining device, comprising a grinding bin (1), which is powered by a power mechanism (2) below to provide the power output of coal powder grinding, and classifies the coal powder particles by a grading bin (3) above, and the coal blocks in the grinding bin (1) enter through a feeding cylinder (4), characterized in that the grinding bin (1) comprises vertically corresponding lower and upper grinding discs (11) and (12), the bottom of the lower grinding disc (11) is fixed with a transmission shaft (13), the transmission shaft (13) is driven to rotate by the power mechanism (2) installed at the bottom, and the grinding bin (1) is externally connected with an air inlet (14). The lower grinding disc (11) comprises a rotating disc (111), a convex bump (112) and a grinding roller groove (113), the bottom of the rotating disc (111) is fixed with the transmission shaft (13), the top of the rotating disc (111) is integrally formed with a semicircular convex bump (112), and the top surface of the rotating disc (111) is externally provided with a ring-shaped grinding roller groove (113) near the circumference. The upper grinding disc (12) comprises a fixed disc (121), a round port (122), a grinding roller (123) and a ventilation hole (124), the fixed disc (121) is fixed with the inner wall of the grinding bin (1), the top surface of the fixed disc (121) is high in the center and low around the circumference, the bottom surface of the fixed disc (121) is low in the center and high around the circumference, the middle gap between the fixed disc (121) and the rotating disc (111) is large, the peripheral gap is small, the center of the fixed disc (121) is provided with the round port (122), the bottom of the feeding cylinder (4) is located above the round port (122), a plurality of grinding rollers (123) are installed on the bottom of the fixed disc (121) near the outer side of the circumference, the bottom of the grinding roller (123) rolls along the grinding roller groove (113), and the ventilation hole (124) is externally provided on the fixed disc (121) to pass through the upper and lower parts and communicate the grinding bin (1) and the grading bin (3). The rotating disc (111) is integrally formed with a powder accumulation folding edge (114) at the outer end of the circumference.
2. The fine coal cleaning device according to claim 1, wherein The grading bin (3) comprises a grading cylinder (31), a filtering cylinder (32), a grading motor (33) and an air outlet (34), the grading cylinder (31) is fixed on the top of the fixed disc (121) and has a gap with the inner wall of the grading bin (3), the filtering cylinder (32) is located inside the coaxial center of the grading cylinder (31), the top of the filtering cylinder (32) is open and the top surface thereof is closed with the top inner wall of the grading bin (3), the grading motor (33) is fixed on the top surface of the grading bin (3) and has an output end fixed with the filtering cylinder (32), and the filtering cylinder (32) is externally communicated with the air outlet (34) of the grading bin (3).
3. The fine coal cleaning device of claim 1, wherein The grading cylinder (31) comprises a fixed cylinder (311) fixed on the top of the fixed disc (121), and a plurality of circulating feeding ports (312) are externally provided on the connection part between the fixed cylinder (311) and the fixed disc (121).
4. The fine coal cleaning apparatus of claim 3, wherein The outer side of the fixed cylinder (311) on the top surface of the fixed disc (121) is fixed with an inwardly inclined ring-shaped airflow baffle (125) at a position inside the ventilation hole (124).
5. The fine coal cleaning apparatus of claim 4, wherein 6. The coal cleaning and sizing apparatus of claim 3, wherein, The filter cartridge (32) comprises a rotating cylinder (321), a connecting rod (322) and a filter screen (323), the top of the rotating cylinder (321) is fixed with the output shaft of the grading motor (33) through the connecting rod (322), and the bottom is fixed with the filter screen (323).
7. The fine coal cleaning device of claim 4, wherein The inside of the fixed cylinder (311) is fixed with a fixed rod (313) in the radial direction, the top of the fixed rod (313) is fixed with a scraper (314), and the scraper (314) is in contact with the bottom surface of the filter screen (323).
8. The fine coal cleaning apparatus of claim 7 wherein, A one-way valve (41) is mounted above the feeding cylinder (4).
9. The fine coal cleaning device of claim 1, wherein A speed reduction motor (21) is fixedly mounted outside the power mechanism (2), and the speed reduction motor (21) is connected with the transmission shaft (13) through a belt pulley set (22) inside the power mechanism (2).
10. The coal cleaning and sizing apparatus of claim 1, wherein, A material receiving plate (15) is sealingly fixed below the grinding bin (1), the transmission shaft (13) is connected with the material receiving plate (15) through a bearing (16), and a material taking window (17) with a sealing plate is arranged on the outer wall of the grinding bin (1) above the material receiving plate (15).