Coarse particle pulverized coal preparation equipment

Abstract

The utility model relates to coarse particle pulverized coal preparation equipment. The coarse particle pulverized coal preparation equipment comprises a machine shell, a feeding device, a grinding device and a sorting device, wherein a pulverized coal channel is arranged in the machine shell. The feeding device communicates with the pulverized coal channel and is used for providing raw coal for the grinding device through the pulverized coal channel. The grinding device comprises a grinding disc, a grinding roller, a loading assembly and a driving assembly. The driving assembly is used for driving the grinding disc to rotate around the center line of the grinding disc. The loading assembly is used for loading the grinding roller on the grinding disc and adjusting the pressure between the grinding roller and the grinding disc. The grinding roller is used for grinding raw coal on the grinding disc into pulverized coal and impurities and squeezing the pulverized coal and the impurities to the edge of the grinding disc. The sorting device is used for separating the pulverized coal from impurities, screening out the pulverized coal meeting the fineness requirement and drying the pulverized coal at the same time. According to the utility model, three functions of milling, drying and pulverized coal separation can be considered, and the pulverized coal cannot be repeatedly and excessively milled under the condition of ensuring that raw coal is fully milled, so that the coal milling power consumption is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder preparation equipment, in particular to coarse particle coal powder preparation equipment. Background Art

[0002] Lignite has good combustion and low price, making it a potential blast furnace injection fuel, but its strong explosiveness and low calorific value are also key factors limiting its use in blast furnace injection. The explosiveness of lignite pulverized coal has an important impact on the safety of the medium-speed milling process. When the temperature, oxygen concentration and other conditions are met, the highly explosive pulverized coal will cause serious explosion accidents. It is necessary to control the lignite explosion within a safe range. Controlling the particle size of lignite and avoiding too small a particle size is one of the effective measures to eliminate the strong explosiveness of lignite.

[0003] In the prior art, coal powder is prepared by fan pulverizer or medium-speed pulverizer. The impact plate of fan pulverizer is greatly worn and has a short service life during operation. Therefore, although fan pulverizer is suitable for grinding lignite with high moisture content, the fan pulverizer system has a large air leakage problem, a short maintenance cycle, and a high maintenance cost in the later stage. When grinding lignite, the medium-speed mill will produce insufficient drying output, so more drying medium needs to be introduced, but this will cause the flow rate of the air-powder mixture in the mill to be too high, which will increase the wear.

[0004] Based on the above-mentioned defects of the prior art, there is an urgent need for a coal powder preparation device that can take into account grinding, drying and coal powder separation. Utility Model Content

[0005] In order to take into account the three functions of coal grinding equipment, namely grinding, drying and coal powder separation, the present application provides a coarse-particle coal powder preparation equipment.

[0006] The coarse-grained coal powder preparation equipment provided by the utility model adopts the following technical scheme:

[0007] A coarse-particle coal powder preparation device comprises a casing, a feeding device, a grinding device and a sorting device; wherein, a coal powder channel is arranged in the casing; the coal powder channel is arranged vertically; the feeding device is communicated with the coal powder channel, and is used to provide raw coal to the grinding device through the coal powder channel; the grinding device comprises a grinding disc, a grinding roller, a loading assembly and a driving assembly; the grinding disc is horizontally arranged inside the casing and is located below the coal powder channel, and the raw coal falls from the coal powder channel to the grinding disc; the driving assembly is transmission-connected to the grinding disc, and is used to drive the grinding disc to rotate around its own center line; the loading assembly is arranged on the casing, and is transmission-connected to the grinding roller, and is used to load the grinding roller on the grinding disc and adjust the pressure between the grinding roller and the grinding disc; the grinding roller is located in the casing and can rotate around its own axis; the grinding roller is used to grind the raw coal on the grinding disc into coal powder and impurities , and squeeze the coal powder and impurities to the edge of the grinding disc; the sorting device includes a hot air source, an air ring, a slag discharge assembly and a screening assembly; the air ring is arranged around the edge of the grinding disc and is fixedly connected to the grinding disc; a plurality of dynamic nozzles are formed on the air ring around the grinding disc; the screening assembly is arranged at the upper part of the casing; the screening assembly has a screening channel and a powder outlet; one side opening of the screening channel is connected to the coal powder channel, and the other side is connected to the screening channel; the screening channel is used to discharge the coal powder that meets the required fineness through the powder outlet, and the coal powder that does not meet the required fineness falls back through the coal powder channel; the hot air source is connected to the lower end opening of the dynamic nozzle, and blows air to the dynamic nozzle from bottom to top to blow the coal powder on the edge of the grinding disc so that it passes through the coal powder channel and enters the screening assembly; the slag discharge assembly is connected to the lower end opening of the dynamic nozzle to discharge impurities at the edge of the grinding disc.

[0008] Optionally, a depression is formed on the upper side of the grinding disc; the depression surrounds the grinding disc, and its axis coincides with the axis of the grinding disc; the grinding roller grinds the raw coal in the depression; a conical cover is provided on the grinding disc protruding upward; the axis of the conical cover coincides with the axis of the grinding disc; the height of the conical cover gradually decreases from the center to the periphery.

[0009] Optionally, a lining plate is provided on the grinding disc; the lining plate covers the upper surface of the grinding disc; the lining plate is composed of a piece of wear-resistant plate, or is spliced ​​from multiple pieces of wear-resistant plate.

[0010] Optionally, the loading assembly includes an accumulator, a loading cylinder and a connecting rod mechanism; the loading cylinder is arranged on the casing; the end of the loading cylinder piston rod is connected to one end of the connecting rod mechanism; the connecting rod mechanism is located inside the casing, and a roller is provided at one end thereof away from the loading cylinder; the grinding roller is rotatably connected to the roller and rotates around the axis of the roller; the accumulator is fixedly connected to the loading cylinder and is communicated with the cylinder body of the loading cylinder, so as to adjust the magnitude of the force output by the loading cylinder.

[0011] Optionally, the loading assembly further comprises an anti-blow plate; the anti-blow plate is arranged on the casing and is located between the roller shaft and the dynamic nozzle; the anti-blow plate is used to prevent the air carrying coal powder ejected from the dynamic nozzle from impacting the roller shaft.

[0012] Optionally, the air ring includes a dynamic ring and a static ring; the dynamic ring and the static ring are coaxially arranged; wherein the inner side surface of the dynamic ring is fixedly connected to the side surface of the grinding disc; the static ring is installed on the inner wall of the casing; a plurality of guide blades are fixed to the outer side surface of the dynamic ring; the plurality of guide blades are evenly spaced around the axis of the grinding disc; and a dynamic nozzle is formed between every two adjacent guide blades.

[0013] Optionally, the screening assembly includes a shell and a plurality of axial blades; the screening channel is located in the shell; the screening channel passes through the shell from top to bottom; the powder outlet is the upper end opening of the screening channel; the axial blades are arranged in the screening channel to block the coal powder that does not reach the required fineness and make the coal powder that does not reach the required fineness fall back to the grinding disc; the feeding device includes a coal dropping pipe; the coal dropping pipe is fixedly connected to the shell, passes through the screening channel from top to bottom, but is not connected to the screening channel; the upper end opening of the coal dropping pipe is used for unloading raw coal, and the lower end is connected to the coal powder channel.

[0014] Optionally, the axial blade includes a blade adjustment rod; the blade adjustment rod is rotatably mounted on the shell and fixedly connected to the axial blade; the blade adjustment rod is used to adjust the installation angle of the axial blade.

[0015] Optionally, an inner cone is vertically arranged inside the shell; the inner cone is located in the screening channel, and the diameter of the middle part is larger than the diameters of the two ends.

[0016] Optionally, the slag discharge assembly includes a scraper and a slag discharge box; the slag discharge box is arranged on the casing; a hot air chamber is formed inside the casing; the hot air chamber is located below the dynamic nozzle and is connected to the slag discharge box; the scraper is located in the hot air chamber and is fixedly connected to the grinding disc; the scraper is used to rotate with the grinding disc to sweep impurities falling into the hot air chamber from the dynamic nozzle into the slag discharge box.

[0017] As described above, the coarse coal powder preparation equipment of the utility model has at least the following beneficial effects:

[0018] 1. The coarse-grained coal powder preparation equipment of the utility model can take into account the three functions of grinding, drying and coal powder separation.

[0019] 2. The coarse-particle coal powder preparation equipment of the utility model ensures that the raw coal is fully ground, and the coal powder will not be repeatedly over-ground, so it has lower coal grinding power consumption.

[0020] 3. By adjusting the pressure of the loading cylinder, the force loaded on the grinding roller can be adjusted separately, and the grinding roller and the loading components corresponding to the grinding roller can be disassembled and repaired separately.

[0021] 4. By setting the angle of the axial blade to be adjustable and arranging an inner cone and an inner partition in the shell, the screening efficiency of the screening component is higher, the fineness of the screened coal powder is adjustable, and the flow of hot air and coal powder is more uniform and the flow field is more uniform; there are no dead corners or gaps in the shell, which can prevent coal powder from accumulating in the shell and affecting the coal powder conveying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the coarse-grained coal powder preparation equipment according to the embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of an embodiment of the utility model for reflecting the structure of a loading component.

[0024] Figure 3 It is a schematic diagram of an embodiment of the utility model for reflecting the structure of a dynamic nozzle and a slag discharge component.

[0025] Figure 4 It is a schematic diagram of the embodiment of the utility model for reflecting the structure of the guide vane and the dynamic nozzle.

[0026] Figure 5 It is a schematic diagram of an embodiment of the utility model for reflecting the structure of a screening component.

[0027] Reference numerals: 1, main motor; 2, coupling; 3, reducer; 4, base; 5, base seal; 6, housing; 601, coal powder channel; 602, hot air chamber; 7, transmission plate; 8, static ring; 9, dynamic ring; 901, guide vane; 902, dynamic nozzle; 10, tray; 101, grinding disc; 102, depression; 11, lining plate; 12, conical cover; 13, grinding device; 1301, rotating shaft; 1302, anti-blow plate; 1303, roller shaft; 1304, swing arm; 1305, grinding roller ; 1306, loading cylinder; 1307, installation door; 1308, accumulator; 14, screening assembly; 1401, shell; 1402, blade adjustment rod; 1403, axial blade; 1404, inner cone; 14041, first cone; 14042, second cone; 1405, inner partition; 1406, coal drop pipe; 1407, powder outlet; 1408, screening channel; 1409, upper cover plate; 1410, side plate; 15, scraper; 16, slag discharge box; 1601, box door. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0029] Please refer to Figure 1-5 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0030] The utility model discloses a coarse-particle coal powder preparation device, which comprises a casing 6, a feeding device, a grinding device 13 and a sorting device.

[0031] Please refer to Figure 1 , Figure 2 The grinding device 13 includes a grinding disc 101, a grinding roller 1305, a loading assembly and a driving assembly.

[0032] The driving assembly includes a main motor 1, a coupling 2, a reducer 3, a base 4, a base seal 5, a transmission disc 7 and a tray 10. The power output by the main motor 1 is output to the transmission disc 7 through the coupling 2 and the reducer 3. The transmission disc 7 is arranged horizontally, and its lower side is drivingly connected to the output shaft of the reducer 3. Driven by the main motor 1, the transmission disc 7 can rotate around its own axis. The tray 10 is installed on the upper side of the transmission disc 7 and is used to support the grinding disc 101. The base 4 is set on the ground. The casing 6 is a hollow cylinder, and the casing 6 is arranged directly above the reducer through the support of the reducer 3 shell and the base 4. The base seal 5 is arranged between the casing 6 and the shell of the reducer 3 to seal the gap between the two and prevent coal powder from leaking from the gap between the casing 6 and the shell of the reducer 3.

[0033] Specifically, the transmission disc 7, the tray 10, and the grinding disc 101 are all located inside the housing 6. The transmission disc 7 is cylindrical, and the edge of the upper side thereof extends outward along the radial direction of the transmission disc 7, and is used to mount the annular tray 10. Corresponding to the shape of the tray 10, the shape of the grinding disc 101 is also annular. The grinding roller 1305 is pressed on the upper surface of the grinding disc 101. When the grinding disc 101 rotates, the grinding roller 1305 can grind the raw coal on the grinding disc 101 into coal powder and sundries.

[0034] As a component for crushing raw coal, the grinding disc 101 needs to reduce the wear of the grinding disc 101 to ensure its service life. In order to increase the service life of the grinding disc 101, the upper surface of the grinding disc 101 is covered by a lining 11. The lining 11 is composed of a whole piece of wear-resistant plate or a plurality of wear-resistant plates. In the present embodiment, the lining 11 is composed of twelve wear-resistant plates, and each wear-resistant plate is detachably connected to the grinding disc 101. When any one or more of the twelve wear-resistant plates are worn, they can be replaced with new wear-resistant plates. The lining 11 replaces the grinding disc 101 to grind the raw coal, which conveniently and effectively extends the service life of the grinding disc 101.

[0035] Please continue to refer to Figure 1 , Figure 2The loading assembly is arranged on the casing 6 and is transmission-connected to the grinding roller 1305, and is used to load the grinding roller 1305 on the grinding disc 101 and adjust the pressure between the grinding roller 1305 and the grinding disc 101. The loading assembly includes an accumulator 1308, a loading cylinder 1306 and a connecting rod mechanism. The loading cylinder 1306 is arranged on the casing 6. The end of the piston rod of the loading cylinder 1306 is connected to one end of the connecting rod mechanism. The connecting rod mechanism is located inside the casing 6, and a roller shaft 1303 is arranged at one end thereof away from the loading cylinder 1306. The pressure roller is rotationally connected to the roller shaft 1303 and rotates around the axis of the roller shaft 1303. The accumulator 1308 is fixedly connected to the loading cylinder 1306 and is communicated with the cylinder body of the loading cylinder 1306, and is used to adjust the magnitude of the force output by the loading cylinder 1306.

[0036] Specifically, a passage is provided on the side of the housing 6 for the connecting rod mechanism, the roller shaft 1303 and the grinding roller 1305 to be installed inside the housing 6, and the passage is closed by the installation door 1307. The installation door 1307 is detachably connected to the housing 6. The cylinder body of the loading cylinder 1306 is detachably connected to the installation, and the piston rod extends horizontally into the housing 6. The connecting rod mechanism includes a swing arm 1304. One end of the swing arm 1304 is connected to the end of the piston rod of the loading cylinder 1306, and the other end is hinged to the roller shaft 1303 through the rotating shaft 1301. Figure 2 As shown, when the piston rod of the loading cylinder 1306 is extended or retracted, the pressure between the grinding roller 1305 and the grinding disc 101 can be adjusted, and the grinding roller 1305 can always be kept at a suitable angle to apply pressure to the grinding disc 101. The swing arm 1304 has a lever effect, with the rotating shaft 1301 as the fulcrum, and the force arm of the swing arm 1304 is relatively long, so that the grinding roller 1305 can obtain a larger loading force.

[0037] The accumulator 1308 is installed on the cylinder body of the loading cylinder 1306 and is located outside the housing 6. It is a device that assists the loading cylinder 1306 in its operation. It can convert the kinetic energy generated in the hydraulic system into compressed air or elastic elements for storage. The accumulator 1308 can stabilize the pressure inside the loading cylinder 1306 and improve the stability of the loading cylinder 1306. The accumulator 1308 can not only Figure 2 As shown, it is installed above the loading cylinder 1306, and can also be installed in other hidden places on the casing 6, and connected to the cylinder body of the loading cylinder 1306 through a hydraulic oil pipe.

[0038] More specifically, in order to improve the working efficiency of the coarse coal powder preparation device of the present invention, a plurality of grinding rollers 1305 can be arranged in the coarse coal powder preparation device, and a set of loading components can be matched for each grinding roller 1305 accordingly. Figure 1As shown, the coarse coal powder preparation device in this embodiment includes two grinding rollers 1305, and each grinding roller 1305 is equipped with a set of loading components according to the above connection method. The two grinding rollers 1305 and their corresponding loading components are symmetrically distributed on the left and right sides of the housing 6 (the left and right direction is Figure 1 left and right directions in the image).

[0039] In order to make the grinding roller 1305 and the grinding disc 101 cooperate better and improve the grinding efficiency of the grinding roller 1305, a depression 102 is formed on the upper side of the grinding disc 101. The depression 102 surrounds the grinding disc 101, and the axis of the depression 102 coincides with the axis of the grinding disc 101. The depression 102 is a deep bowl-shaped curved surface. The grinding roller 1305 grinds the raw coal in the depression 102. Figure 2 As shown, the shape of the recess 102 matches the shape of the grinding roller 1305 , and the edge portion of the grinding roller 1305 can just fit into the recess 102 and can roll along the recess 102 .

[0040] Please refer to Figure 1 , Figure 3 , Figure 4 The sorting device includes a hot air source, an air ring, a slag discharge assembly and a screening assembly 14. The air ring includes a moving ring 9 and a stationary ring 8. The moving ring 9 and the stationary ring 8 are coaxially arranged. Among them, the inner side surface of the moving ring 9 is fixedly connected to the side surface of the grinding disc 101. The stationary ring 8 is installed on the inner wall of the casing 6. A plurality of guide blades 901 are fixed to the outer side surface of the moving ring 9. The plurality of guide blades 901 are evenly spaced around the axis of the grinding disc 101. A moving nozzle 902 is formed between every two adjacent guide blades 901.

[0041] For details, please refer to Figure 3 A hot air chamber 602 is formed between the lower side of the edge of the grinding disc 101 and the inner wall of the housing 6. The hot air chamber 602 is isolated from the outside of the housing 6. The hot air source introduces hot air into the hot air chamber 602, and then the hot air is ejected upward from the driven nozzle 902. The hot air source can be a device that generates hot air alone, or other equipment that can generate hot air at the production site, and the hot air therein is introduced into the hot air chamber 602 through an induced draft fan, which can serve as a hot air source.

[0042] Please refer to Figure 4 , Figure 4 : is a schematic diagram of the horizontal expansion of the dynamic nozzle 902. There is an angle between the guide blade 901 and the vertical direction, and the angle is between 0° and 90°, and does not include 90°. For example, it can be 0°, 30°, 45°, 60°, and preferably 30° in this embodiment. Secondly, by changing the thickness and number of the guide blades 901, the flow area of ​​the hot air passing through the dynamic nozzle 902 can be adjusted, thereby changing the size of the hot air wind force.

[0043] Please refer to Figure 1 , Figure 3 Inside the housing 6, just above the grinding disc 101, there is a coal powder channel 601, which is arranged vertically. The lower end opening of the coal powder channel 601 covers the grinding disc 101 and is connected to the dynamic nozzle 902, and the upper end opening is connected to the screening assembly 14. The feeding device feeds the raw coal onto the grinding disc 101. As the grinding disc 101 rotates, the raw coal is crushed into coal powder and impurities, and the grinding roller 1305 gradually squeezes the coal powder and impurities to the edge of the grinding disc 101. When the coal powder and impurities reach the dynamic nozzle 902, the coal powder with a smaller weight is entrained by the hot air and enters the screening assembly 14 through the coal powder channel 601. However, the impurities cannot be crushed by the grinding roller 1305 and are heavy, so they cannot be entrained by the hot air. The impurities fall into the hot air chamber 602 through the dynamic nozzle 902.

[0044] Since the roller shaft 1303 is located just above the dynamic nozzle 902, in order to prevent the coal powder sprayed from the dynamic nozzle 902 from impacting the roller shaft 1303 and reduce the service life of the roller shaft 1303, the loading assembly further includes a blow-proof plate 1302. The blow-proof plate 1302 is arranged on the housing 6 and is located between the roller shaft 1303 and the dynamic nozzle 902. The blow-proof plate 1302 can prevent the air carrying the coal powder sprayed from the dynamic nozzle 902 from impacting the roller shaft 1303.

[0045] The slag discharge assembly includes a scraper 15 and a slag discharge box 16. The slag discharge box 16 is arranged on the housing 6. A hot air chamber 602 is formed inside the housing 6. The hot air chamber 602 is located below the moving nozzle 902 and is connected to the slag discharge box 16. The scraper 15 is located in the hot air chamber 602 and is fixedly connected to the grinding disc 101. The scraper 15 is used to rotate with the grinding disc 101, and sweep the impurities falling into the hot air chamber 602 from the moving nozzle 902 into the slag discharge box 16.

[0046] Specifically, the slag box 16 is installed on the casing 6, and the opening of the slag box 16 is connected to the hot air chamber 602 and is located directly below the dynamic nozzle 902. The scraper 15 is detachably connected to the transmission disk 7 and is located in the hot air chamber 602. The lower edge of the scraper 15 is flush with the opening of the slag box 16. The scraper 15 is located between the dynamic nozzle 902 and the opening of the slag box 16, and rotates with the transmission disk 7. After the impurities enter the hot air chamber 602, they fall into the slag box 16 through the opening of the slag box 16. The function of the scraper 15 is to clear the opening of the slag box 16 in time when the opening of the slag box 16 is blocked by debris, so that the debris can smoothly enter the slag box 16. A box door 1601 is provided on the side wall of the slag box 16, and the staff can regularly open the box door 1601 to clean up the debris in the slag box 16.

[0047] Please refer to Figure 5The screening assembly 14 includes a shell 1401 and a plurality of axial blades 1403. A screening channel 1408 is located in the shell 1401. The screening channel 1408 penetrates the shell 1401 from top to bottom. The powder outlet 1407 is the upper end opening of the screening channel 1408. The axial blades 1403 are arranged in the screening channel 1408 to block the coal powder that does not reach the required fineness and make the coal powder that does not reach the required fineness fall back to the grinding disc 101. The feeding device includes a coal dropping pipe 1406. The coal dropping pipe 1406 is fixedly connected to the shell 1401, and passes through the screening channel 1408 from top to bottom, but is not connected to the screening channel 1408. The upper end opening of the coal dropping pipe 1406 is used for unloading raw coal, and the lower end is connected to the coal powder channel 601.

[0048] Please refer to Figure 1 , the axis of the coal drop pipe 1406 coincides with the axis of the grinding disc 101. In order to allow the raw coal dropped from the coal drop pipe 1406 to be quickly distributed on the grinding disc 101, a conical cover 12 is provided in the center of the grinding disc 101. The conical cover 12 is conical, the axis coincides with the axis of the grinding disc 101, and the tip thereof points to the coal drop pipe 1406. When the raw coal drops from the coal drop pipe 1406 and contacts the conical cover 12, the raw coal is distributed to the grinding disc 101 along the side of the conical cover 12, which helps to improve the feeding efficiency of the coal drop pipe 1406.

[0049] Specifically, the shell 1401 is approximately truncated cone-shaped as a whole, including an upper cover plate 1409 and a side plate 1410. The upper cover plate 1409 is circular, and the side plate 1410 surrounds the lower edge of the upper cover plate 1409 to form the shell 1401. The upper end opening of the screening channel 1408 is located in the center of the upper cover plate 1409, and the lower end opening is formed between the lower edge of the side plate 1410 and the side of the coal drop pipe 1406. The coal powder carried by the hot air enters the screening channel 1408. The coal powder that meets the fineness requirements passes through the gap between two adjacent axial blades 1403 and is discharged from the powder outlet 1407. The coal powder that does not meet the fineness requirements collides with the axial blades 1403 and falls back to the grinding disc 101 to be ground again.

[0050] The axial blade 1403 includes a blade adjustment rod 1402. The blade adjustment rod 1402 is rotatably mounted on the housing 1401 and fixedly connected to the axial blade 1403. The blade adjustment rod 1402 is used to adjust the installation angle of the axial blade 1403. By adjusting the installation angle of the axial blade 1403, the fineness of the coal powder allowed to pass through the screening channel 1408 can be adjusted, so that the screening assembly 14 can adapt to various required finenesses of coal powder.

[0051] More specifically, an inner cone 1404 is vertically disposed inside the housing 1401. The inner cone 1404 is located inside the screening channel 1408, and the diameter of the middle portion is larger than the diameters of the two ends. The inner cone 1404 can be other components with a large diameter in the middle portion and small diameters at both ends. The shape used in this embodiment is one of the preferred shapes. Please refer to Figure 5 The inner cone 1404 includes a first cone 14041 and a second cone 14042. The bottom of the first cone 14041 and the bottom of the second cone 14042 are fixedly connected and smoothly transitioned. The first cone 14041 is located upstream of the airflow direction in the screening channel 1408 relative to the second cone 14042. Along the airflow direction in the screening channel 1408, the cross-sectional area of ​​the first cone 14041 gradually increases, and the cross-sectional area of ​​the second cone 14042 gradually decreases. The function of the inner cone 1404 is to weaken the flow field of the hot air flow to diffuse toward the center of the shell 1401, thereby improving the hot air delivery efficiency.

[0052] An inner partition 1405 is also provided inside the housing 1401, and the inner partition 1405 is obliquely provided between the lower side of the upper cover 1409 and the inner side of the side plate 1410 to prevent hot air from passing through the corner between the lower side of the upper cover 1409 and the inner side of the side plate 1410. The partition can reduce the impact of coal powder on the upper cover 1409 and the side plate 1410, and can prevent coal powder from forming a dead zone in the corner between the lower side of the upper cover 1409 and the inner side of the side plate 1410, thereby improving the transmission efficiency of hot air.

[0053] The working principle of the coarse-particle coal powder preparation equipment of the utility model is as follows: the raw coal falls from the coal drop pipe 1406, passes through the coal powder channel 601 and falls onto the conical cover 12, and is distributed onto the grinding disc 101 through the side of the conical cover 12. Driven by the main motor 1, the grinding disc 101 rotates, and grinds the raw coal on the grinding disc 101 into coal powder and impurities. The coal powder and impurities are gradually squeezed to the edge of the grinding disc 101 by the grinding roller 1305 and reach the dynamic nozzle 902. The impurities fall into the slag discharge box 16 through the dynamic nozzle 902 and the hot air chamber 602. The coal powder is entrained by the spiral airflow ejected from the passive nozzle 902, rises through the coal powder channel 601 to the screening assembly 14, is gradually dried in the process of rising, and enters the screening channel 1408 through the lower end opening of the screening channel 1408. The part of the coal powder that meets the fineness requirement is discharged from the powder outlet 1407 for production use, and the part that does not meet the fineness requirement collides with the axial blades 1403 and falls back onto the grinding disc 101 to be ground again.

[0054] Compared with the prior art, the coarse-particle coal powder preparation equipment of the utility model can take into account the three functions of grinding, drying and coal powder separation, and also has the following advantages:

[0055] The coarse-particle coal powder preparation equipment of the utility model ensures that the raw coal is fully ground, and the coal powder will not be repeatedly over-ground, so it has lower coal grinding power consumption.

[0056] By adjusting the pressure of the loading cylinder 1306, the force loaded on the grinding roller 1305 can be adjusted separately, and the grinding roller 1305 and the loading assembly corresponding to the grinding roller 1305 can be disassembled and repaired separately.

[0057] By setting the angle of the axial blade 1403 to be adjustable, and arranging an inner cone 1404 and an inner partition 1405 in the shell 1401, the screening efficiency of the screening component 14 is higher, the fineness of the screened coal powder is adjustable, and the flow of hot air and coal powder is more uniform and the flow field; there are no dead corners or gaps in the shell 1401, which can prevent coal powder from accumulating in the shell 1401 and affecting the coal powder conveying efficiency.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A coarse-particle coal powder preparation device, characterized in that: It comprises a casing (6), a feeding device, a grinding device (13) and a sorting device; wherein: A coal powder channel (601) is provided in the casing (6); the coal powder channel (601) is vertically arranged; The feeding device is in communication with the pulverized coal channel (601) and is used to provide raw coal to the grinding device (13) through the pulverized coal channel (601); The grinding device (13) comprises a grinding disc (101), a grinding roller (1305), a loading assembly and a driving assembly; The grinding disc (101) is horizontally arranged inside the housing (6) and is located below the coal powder channel (601), and the raw coal falls from the coal powder channel (601) to the grinding disc (101); the driving component is in driving connection with the grinding disc (101) and is used to drive the grinding disc (101) to rotate around its own center line; The loading assembly is arranged on the housing (6) and is drivingly connected to the grinding roller (1305), and is used to load the grinding roller (1305) onto the grinding disc (101) and adjust the pressure between the grinding roller (1305) and the grinding disc (101); The grinding roller (1305) is located in the housing (6) and can rotate around its own axis; the grinding roller (1305) is used to grind the raw coal on the grinding disc (101) into coal powder and impurities, and squeeze the coal powder and impurities to the edge of the grinding disc (101); The separation device comprises a hot air source, an air ring, a slag discharge component and a screening component (14); The air ring is arranged around the edge of the grinding disc (101) and is fixedly connected to the grinding disc (101); a plurality of dynamic nozzles (902) are formed on the air ring around the grinding disc (101); The screening component (14) is arranged at the upper part of the casing (6); the screening component (14) has a screening channel (1408) and a powder outlet (1407); one side opening of the screening channel (1408) is connected to the coal powder channel (601), and the other side is connected to the screening channel (1408); the screening channel (1408) is used to discharge the coal powder that reaches the required fineness through the powder outlet (1407), and the coal powder that does not reach the required fineness falls back through the coal powder channel (601); The hot air source is connected to the lower opening of the dynamic nozzle (902) and blows air from bottom to top toward the dynamic nozzle (902) to blow the coal powder on the edge of the grinding disc (101) so that the coal powder passes through the coal powder channel (601) and enters the screening assembly (14); The slag discharge assembly is in communication with the lower end opening of the dynamic nozzle (902) and is used to discharge impurities on the edge of the grinding disc (101).

2. The coarse coal powder preparation equipment according to claim 1, characterized in that: The upper side of the grinding disc (101) is formed with a recess (102); The depression (102) surrounds the grinding disc (101) in one circle, and the axis thereof coincides with the axis of the grinding disc (101); The grinding roller (1305) grinds the raw coal in the depression (102); A conical cover (12) is protruding upwards from the grinding disc (101); the axis of the conical cover (12) coincides with the axis of the grinding disc (101); and the height of the conical cover (12) gradually decreases from the center to the periphery.

3. The coarse coal powder preparation equipment according to claim 1 or 2, characterized in that: The grinding disc (101) is provided with a lining plate (11); The lining plate (11) covers the upper surface of the grinding disc (101); the lining plate (11) is composed of a piece of wear-resistant plate, or is formed by splicing a plurality of wear-resistant plates.

4. The coarse coal powder preparation equipment according to claim 1, characterized in that: The loading assembly comprises an accumulator (1308), a loading cylinder (1306) and a connecting rod mechanism; The loading cylinder (1306) is arranged on the housing (6); the end of the piston rod of the loading cylinder (1306) is connected to one end of the connecting rod mechanism; The connecting rod mechanism is located inside the housing (6), and a roller shaft (1303) is provided at one end of the connecting rod mechanism away from the loading cylinder (1306); the grinding roller (1305) is rotatably connected to the roller shaft (1303) and rotates around the axis of the roller shaft (1303); The accumulator (1308) is fixedly connected to the loading cylinder (1306) and communicated with the cylinder body of the loading cylinder (1306) for adjusting the magnitude of the force output by the loading cylinder (1306).

5. The coarse coal powder preparation equipment according to claim 4, characterized in that: The loading assembly also includes a blowout plate (1302); The anti-blow plate (1302) is arranged on the casing (6) and is located between the roller shaft (1303) and the dynamic nozzle (902); the anti-blow plate (1302) is used to prevent the air carrying coal powder sprayed from the dynamic nozzle (902) from impacting the roller shaft (1303).

6. The coarse coal powder preparation equipment according to claim 1, characterized in that: The wind ring comprises a dynamic ring (9) and a static ring (8); the dynamic ring (9) and the static ring (8) are coaxially arranged; wherein, The inner side surface of the dynamic ring (9) is fixedly connected to the side surface of the grinding disc (101); the static ring (8) is mounted on the inner wall of the housing (6); A plurality of guide blades (901) are fixed on the outer side surface of the dynamic ring (9); the plurality of guide blades (901) are evenly spaced and distributed around the axis of the grinding disc (101); and a dynamic nozzle (902) is formed between every two adjacent guide blades (901).

7. The coarse coal powder preparation equipment according to claim 1, characterized in that: The screening assembly (14) comprises a housing (1401) and a plurality of axial blades (1403); The screening channel (1408) is located in the shell (1401); the screening channel (1408) penetrates the shell (1401) from top to bottom; the powder outlet (1407) is the upper end opening of the screening channel (1408); The axial blades (1403) are arranged in the screening channel (1408) to block the coal powder that does not reach the required fineness and make the coal powder that does not reach the required fineness fall back to the grinding disc (101); The feeding device comprises a coal dropping pipe (1406); The coal dropping pipe (1406) is fixedly connected to the shell (1401), and passes through the screening channel (1408) from top to bottom, but is not connected to the screening channel (1408); the upper end opening of the coal dropping pipe (1406) is used for unloading raw coal, and the lower end is connected to the coal powder channel (601).

8. The coarse coal powder preparation equipment according to claim 7, characterized in that: The axial blade (1403) includes a blade adjustment rod (1402); The blade adjustment rod (1402) is rotatably mounted on the housing (1401) and is fixedly connected to the axial blade (1403); the blade adjustment rod (1402) is used to adjust the installation angle of the axial blade (1403).

9. The coarse coal powder preparation equipment according to claim 7 or 8, characterized in that: An inner cone (1404) is vertically arranged inside the shell (1401); the inner cone (1404) is located in the screening channel (1408); The inner cone (1404) includes a first cone (14041) and a second cone (14042); The bottom of the first cone (14041) and the bottom of the second cone (14042) are fixedly connected and smoothly transitioned; the first cone (14041) is located upstream of the airflow direction in the screening channel (1408) relative to the second cone (14042); along the airflow direction in the screening channel (1408), the cross-sectional area of ​​the first cone (14041) gradually increases, and the cross-sectional area of ​​the second cone (14042) gradually decreases.

10. The coarse coal powder preparation equipment according to claim 1, characterized in that: The slag discharge assembly comprises a scraper (15) and a slag discharge box (16); The slag discharge box (16) is arranged on the casing (6); A hot air chamber (602) is formed inside the casing (6); the hot air chamber (602) is located below the dynamic nozzle (902) and is connected to the slag discharge box (16); The scraper (15) is located in the hot air chamber (602) and is fixedly connected to the grinding disc (101); the scraper (15) is used to rotate with the grinding disc (101) to sweep impurities falling into the hot air chamber (602) from the moving nozzle (902) into the slag discharge box (16).

Images