CN113953064B - Self-sorting ball mill and application thereof - Google Patents
Self-sorting ball mill and application thereof Download PDFInfo
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- CN113953064B CN113953064B CN202111208969.4A CN202111208969A CN113953064B CN 113953064 B CN113953064 B CN 113953064B CN 202111208969 A CN202111208969 A CN 202111208969A CN 113953064 B CN113953064 B CN 113953064B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
- B02C17/06—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with several compartments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/186—Adding fluid, other than for crushing by fluid energy
- B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
- B02C17/1885—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone the applied gas acting to effect material separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/186—Adding fluid, other than for crushing by fluid energy
- B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
- B02C17/189—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone with return of oversize material to crushing zone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a self-sorting ball mill and application thereof, wherein the self-sorting ball mill comprises a cylinder body, a feeding hole and a discharging hole, wherein the cylinder body inclines upwards from the side of the feeding hole to the side of the discharging hole; a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, and a first main partition panel is arranged between the grinding bin and the powder selecting bin; a static powder concentrator and/or a dynamic powder concentrator are arranged in the powder concentrator. According to different selected materials, the powder selecting bin can be independently selected to adopt a dynamic powder selecting machine or a static powder selecting machine, can also adopt a form of combining the dynamic powder selecting machine and the static powder selecting machine, and can also be provided with a drying bin. The invention can complete the grinding and sorting of materials in the ball mill without an external powder concentrator, effectively reduces the height of a factory building and the occupied area, reduces the attached equipment, saves the investment cost, reduces the equipment failure rate, reduces the production and maintenance cost, can discharge qualified fine powder generated in the grinding process in time, reduces the excessive grinding of the materials in the ball mill, saves the power consumption of grinding, and is beneficial to energy conservation and emission reduction of production enterprises.
Description
Technical Field
The invention relates to the technical field of ball mills, in particular to a self-sorting ball mill and application thereof.
Background
The ball mill comprises a cylinder body and a grinding body, when the cylinder body of the ball mill rotates, the grinding body is attached to a lining plate of the cylinder body and taken away by the cylinder body under the action of inertia, centrifugal force and friction force, when the ball mill is taken to a certain height, the ball mill is thrown off under the action of gravity of the ball mill, and the thrown-off grinding body crushes materials under the action of gravity and impact force to realize material grinding. The ball mill has simple structure and good equipment reliability, and is widely applied to industries such as building materials, mineral separation, metallurgy, electric power, medicine, food, chemical industry and the like. The ball mill can be divided into a dry type and a wet type according to different grinding environments; according to different transmission modes, the transmission mode can be divided into a center transmission mode and an edge transmission mode.
Although the ball mill has a simple structure, the grinding principle of the ball mill is single-particle impact crushing, the grinding efficiency is low, and a large amount of energy is converted into potential energy for lifting the steel balls and the materials, kinetic energy for impact between the steel balls and grinding heating during material grinding. Research data show that the energy utilization rate of the ball mill is less than 5%. Because the thick and thin materials in the ball mill are mixed, the fine powder meeting the product requirement is easy to agglomerate in the mill, the agglomerated materials are bonded on the lining plate to form a cushion layer, and researches show that when the cushion layer of the lining plate is 0.2mm, the impact force of the steel ball is reduced by 80%. The external embodiment is that the ball mill has the problems of ball pasting, full grinding and the like, so that the ball mill cannot be normally produced, or the production energy consumption is very high during the production of the ball mill. Zhou good (cement technology, 6 th year 2014) introduced a technology of grinding ultrafine cement grouting material by using a phi 2.6 x 13m ball mill, and when the ultrafine cement is completely produced by using P.O 52.5 cement, the ball is seriously pasted by the mill; when the clinker and gypsum are used to grind the superfine cement, the output is too low and the power consumption is too high. The scheme adopted finally is as follows: 70 percent of P.O 52.5 is adopted, and 30 percent of clinker and gypsum are added, so that the continuous normal production of a mill can be ensured; after grinding, 8 percent of silica fume (specific surface area 2000 m) is added 2 /kg) of the raw materials are put into a powder concentrator together to realize that the specific surface area of the product is more than or equal to 800m 2 And the power consumption of the working procedure is up to 155kW/t.
Therefore, in order to improve the yield of the ball mill system and reduce the grinding energy consumption, a powder concentrator technology gradually appears. The method comprises the following steps: and (3) feeding the materials ground by the ball mill into the powder selecting machine through a lifting machine, so that qualified materials are selected in time in the powder selecting machine, and unqualified materials return to the ball mill for continuous grinding. Due to the appearance and maturity of the powder concentrator technology, the power consumption of a grinding system of the ball mill is greatly reduced, but materials need to be lifted to the top of the powder concentrator due to the limitation of process arrangement, so that the equipment is increased, the civil engineering cost is increased, and the investment cost is high.
Chinese patent publication No. CN201197950 discloses an internal selection powder screening composite cement mill, which comprises a cylinder and an internal screening device, wherein the internal screening device comprises a grate plate, a coarse powder guide cone, a tubular screen, a fine powder guide cone and an annular pipe. One end of the tubular sieve is arranged on the circumferential surface of the annular pipe and is communicated with the annular pipe, the other end of the tubular sieve is arranged on the inner wall of the cylinder body, and the annular pipe is provided with a coarse powder guide cone and a fine powder guide cone at the end, and the tubular sieve further comprises a sieve plate, a ventilation grate plate and a material blocking inclined plate. The ventilation grate plate is arranged at the other end of the annular pipe, the sieve plate is arranged between the tubular sieve and the ventilation grate plate, one side face of the tubular sieve is arranged on the sieve plate, and the material blocking inclined plate is arranged on the edge of the outer end of the sieve face of the tubular sieve. The essence of the method is that the functions of the partition board are supplemented, and a grate board is arranged in front of the original partition board, but the method has no substantial internal selection and screening functions.
Chinese patent publication No. CN101920219A discloses an internal powder selecting device for a dry ball mill, which is characterized in that a stainless steel powder selecting pipe is installed in an inner cavity of the dry ball mill, a powder selecting connecting pipe one is connected with a powder selecting connecting pipe two of a mill tail separation bin in parallel, a finished product conveying pipe, a catcher (cyclone, bag type dust remover group), a fan, a stainless steel return pipe, and a ball mill are sequentially connected in a gas and material closed circuit. The powder selecting pipe timely selects finished materials formed by grinding the mill interior and mill tail in a negative pressure state by utilizing the suction force of the fan. The core of the method is that a steel pipe is arranged in a grinding bin of the ball mill, and a finished product is selected out through the steel pipe under the action of negative pressure. The stainless steel powder selecting pipe is arranged in the grinding bin, and the steel ball is thrown down to easily deform the steel pipe, so that the stainless steel powder selecting pipe has no practicability; in addition, the powder is drawn out of the steel pipe by the negative pressure, and the powder sorting function is not provided.
Disclosure of Invention
In order to solve the problem that fine powder agglomeration in the existing ball mill is easy to be fully ground or over-ground, the invention provides a self-sorting ball mill which is used for reducing the phenomenon of fine powder agglomeration or over-grinding in the ball mill, reducing the height of a workshop, reducing the investment cost of a grinding system, reducing the grinding energy consumption of the ball mill, improving the grinding efficiency, increasing the energy utilization rate and promoting energy conservation and emission reduction.
The invention is realized in such a way that the self-sorting ball mill comprises a cylinder body, a feeding hole and a discharging hole, wherein the cylinder body inclines upwards from the side of the feeding hole to the side of the discharging hole, and the inclination angle is 2-5 degrees; a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, and a first main partition panel is arranged between the grinding bin and the powder selecting bin; and a static powder concentrator and/or a dynamic powder concentrator are arranged in the powder selecting bin.
Preferably, an inclined lining plate is arranged on the inner wall of the barrel of the powder selecting bin, and an included angle between the inclined lining plate and the axis of the barrel is 3-15 degrees.
Preferably, the dynamic powder concentrator is composed of a rotor, a counterattack cone, a transmission shaft and a powder concentrator drive, blades of the rotor are parallel to an inclined lining plate in the powder concentrator, the counterattack cone is fixed at one end of the rotor close to the feeding side, and the diameter of the counterattack cone is the same as the outer diameter of the rotor; the rotor is connected with the powder concentrator through a transmission shaft for driving.
Preferably, when only the dynamic powder concentrator is arranged in the powder separation bin, a first vent hole and a first grate seam are arranged on the first main partition board, the first vent hole is positioned in the central area, the first grate seam is positioned on the periphery of the first vent hole, the center of the first vent hole is coaxial with the mill barrel, the diameter of the first vent hole is 0.2-0.4 times of that of the mill barrel, the first vent hole is of a net structure, and the effective size of a mesh is 10-15 mm; the grate seam one close to the periphery of the vent hole is a conical grate seam, the diameter of the grate seam one is gradually increased from the grinding bin side to the powder selecting bin side, the diameter of the grate seam one close to the grinding bin side is 4-10 mm, and the diameter of the grate seam one close to the powder selecting bin side is 6-12 mm; a first grate seam close to the edge area of the main partition board is a long strip-shaped grate seam, and the length is 25mm and the width is 4mm; the thickness of the first main partition board is 20-60 mm.
Preferably, when the powder selecting bin is internally provided with the static powder selecting machine and the dynamic powder selecting machine, the static blades of the static powder selecting machine are arranged in a conical shape, and the static powder selecting machine is positioned between the first main partition board and the dynamic powder selecting machine.
Preferably, the static powder concentrator comprises static blades which are arranged in a conical manner or are arranged in parallel with the axis of the cylinder;
when the static blades are arranged in a conical shape, the included angle between the static blades and the axis of the cylinder body is 45-65 degrees, the diameter of the section of the cone of the static blades is gradually increased from the grinding bin side to the powder selecting bin side, one end, close to the grinding bin, of each static blade is fixed on the first main partition board, and the other end of each static blade is fixed on the cylinder body; at the moment, the inner area of the first main partition board intersected with the conical static blades is a blind plate, and the outer area is provided with a grid seam; the width of each static blade is 50-300 mm, and the gap between two adjacent static blades is 50-400 mm;
when the static blades are arranged in parallel with the axis of the cylinder body, one end of each static blade close to the grinding bin is fixed on the first main partition board, and the other end of each static blade is fixed on the cylinder body; at the moment, the inner area of the first main partition plate intersected with the static blades is a blind plate, and the outer area is provided with a grid seam; the width of each static blade is 50-300 mm, and the gap between two adjacent static blades is 100-400 mm.
Preferably, the grinding lining plate is arranged on the inner wall of the barrel body of the grinding bin, and a plurality of activation rings are arranged in the grinding bin.
Preferably, the included angle between the feed inlet and the axis of the cylinder body is greater than 45 degrees, and an external fixing structure is adopted and does not rotate along with the cylinder body.
Preferably, the discharge end of the feed inlet is provided with a material preventing device, the material preventing device is composed of a conical telescopic steel sheet, a light spring and a lifting plate, the conical telescopic steel sheet is positioned on the inner side of the lifting plate, the large-diameter end of the conical telescopic steel sheet is fixed on the lifting plate, and the small-diameter end of the conical telescopic steel sheet is connected with the lifting plate through the light springs; the conical telescopic steel sheet is formed by sequentially stacking and enclosing a plurality of baffle plates, and each baffle plate corresponds to one light spring; the length of the lifting plate is greater than that of the tapered telescopic steel sheet.
Preferably, a drying bin is further arranged between the feeding port and the grinding bin, and a main partition board II is arranged between the drying bin and the grinding bin.
Preferably, a plurality of scattering devices are arranged in the drying bin, the height of each scattering device is 10-25% of the diameter of the cylinder, and the gap between every two adjacent scattering devices is 100-400 mm.
Preferably, the second main partition plate is provided with a second vent hole positioned in the central area and a second grate seam positioned around the second vent hole, and the edge area close to the second main partition plate is a blind plate; the center of the second vent hole is coaxial with the mill cylinder, the diameter of the second vent hole is 0.3-0.6 times of that of the mill cylinder, the second vent hole is of a net structure, and the effective size of a mesh hole is 15-30 mm; the second grate seam is a conical grate seam, the diameter of the second grate seam is gradually increased from the side of the drying bin to the side of the grinding bin, the diameter of the second grate seam close to the side of the drying bin is 10-15 mm, and the diameter of the second grate seam close to the side of the grinding bin is 20-30 mm; the thickness of the second main partition board is 20-60 mm.
Further preferably, a feeding conveying reamer is arranged at the feeding port.
The self-sorting ball mill can be applied to a combined grinding system with pre-grinding equipment, a self-sorting ball mill system for grinding superfine materials and a steel slag iron removal tail mud recycling treatment system.
The invention has the following advantages and beneficial effects:
1) The self-sorting ball mill can discharge qualified fine powder generated in the grinding process in time, reduces the excessive grinding of materials in the ball mill, saves the power consumption of grinding, and is beneficial to energy conservation and emission reduction of production enterprises.
2) According to the self-sorting ball mill, the grinding and sorting of materials are completed in the ball mill, an external powder concentrator is not needed, the height and the floor area of a factory building can be effectively reduced, auxiliary equipment such as a hoister and a conveying chute can be reduced, the investment cost is saved, the equipment failure rate is reduced, and the production and maintenance cost is reduced.
3) The self-sorting ball mill can shorten the time for adjusting the quality of finished products, adjust the material quantity and the finished product quantity in the ball mill in real time, efficiently control the yield, improve the production efficiency and reduce the production cost.
4) The self-sorting ball mill can integrate drying, grinding and sorting, reduce the process flow, improve the wind efficiency of the system, reduce the wind volume by 50-70% compared with the traditional circulation system, and reduce the wind energy consumption of the system.
5) According to the self-sorting ball mill, the powder selecting machine and the ball mill are on the same horizontal plane, and the height of the powder selecting machine of the traditional circulation system is 2-3 times of the height of the ball mill, so that compared with the traditional circulation (the ball mill and the powder selecting machine) system, the self-sorting ball mill disclosed by the invention has the advantages that the height of the lifted material is reduced, the potential energy required to be overcome is reduced, and the production energy consumption of the system is saved.
6) The self-sorting ball mill provided by the invention has the advantages that auxiliary equipment such as a lifter, a conveying chute and a conveying chute are omitted, pollution points of leakage and leakage in a system are reduced, disordered discharge of dust is reduced, and clean production and environmental protection are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of a self-sorting ball mill according to a first embodiment of the present invention;
FIG. 2 is a front view of a first main compartment plate according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of a first main compartment plate according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of an anti-impact device according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an activation ring provided in accordance with one embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a self-classifying ball mill provided in the second embodiment of the present invention;
FIG. 7 is a front view of a first main compartment plate according to a second embodiment of the present invention;
FIG. 8 is a sectional view of a first main compartment plate according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a self-sorting ball mill provided in the third embodiment of the present invention;
FIG. 10 is a front view of a second main partition panel according to a third embodiment of the present invention;
FIG. 11 is a sectional view of a second main compartment plate provided in a third embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a self-sorting ball mill according to a fourth embodiment of the present invention;
FIG. 13 is a front view of a first main compartment plate according to a fourth embodiment of the present invention;
FIG. 14 is a sectional view of a first main compartment plate according to a fourth embodiment of the present invention;
fig. 15 is a flowchart of an integrated grinding system using a self-sorting ball mill according to a fifth embodiment of the present invention;
fig. 16 is a flowchart of an integrated grinding system using a self-sorting ball mill according to a sixth embodiment of the present invention;
fig. 17 is a flow chart of a self-sorting ball mill system for grinding ultra-fine materials according to a seventh embodiment of the present invention;
fig. 18 is a flowchart of a recycling system for steel slag iron-removing tailings provided in the eighth embodiment of the present invention.
In the figure: 10. a cylinder body; 101. a feed inlet; 102. a discharge port; 103. a dust collection port;
20. a grinding bin; 201. grinding the lining plate; 202. an activation ring;
30. selecting powder; 301. an inclined lining plate; 310. a dynamic powder concentrator; 311. a rotor; 312. a counterattack cone; 313. a drive shaft; 314. driving the powder concentrator; 320. static powder selecting machine; 321. a static blade;
40. a first main partition panel; 401. a first ventilation hole; 402. a first grate seam;
50. a material anti-scour device; 501. a tapered retractable steel sheet; 5011. a baffle plate; 502. a light spring; 503. a material raising plate;
60. a drying bin; 601. feeding and conveying reamer; 602. a breaking device;
70. a second main partition panel; 701. a second air vent; 702. a second grate seam;
1. a first hoist; 2. a buffer bin; 3. a roll squeezer; 4. a second hoist; 5. a combined powder concentrator; 6. a cyclone; 7. a self-sorting ball mill; 8. a first dust collector; 9. a second dust collector; 11. a belt scale; 12. a filter press; 13. a biomass combustion furnace; 14. a raw material bin.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 5, the present embodiment provides a self-sorting ball mill, including a cylinder 10, a feeding port 101, and a discharging port 102, wherein the cylinder 10 is inclined upward from the feeding port 101 to the discharging port 102, and the inclination angle is 2 to 5 °; the barrel 10 is driven to rotate by a mill drive (the mill drive is not shown in the figure, and the barrel 10 can be driven to rotate by a gear transmission or other modes), and a grinding bin 20 and a powder selecting bin 30 are arranged in the barrel 10 from a feeding hole 101 to a discharging hole 102 in sequence.
The inner wall of the cylinder body 10 of the grinding bin 20 is provided with a grinding lining plate 201, and the grinding lining plate 201 is parallel to the axis of the cylinder body 10; the activation rings 202 are arranged in the grinding bin 20, so that the material retention time can be increased, the material grinding time can be prolonged, the specific structures of the activation rings 202 can be selected according to needs, and only one of the activation rings is illustrated in the embodiment. The grinding bin 20 is 1 bin or a plurality of bins, and when a plurality of bins are adopted, a bin separating plate is arranged between the bins.
An inclined lining plate 301 is arranged on the inner wall of the barrel 10 of the powder selecting bin 30, the inner diameter of the inclined lining plate 301 is gradually reduced from the feeding end of the powder selecting bin 30 to the discharging end of the powder selecting bin 30, and the included angle between the inclined lining plate 301 and the axis of the barrel 10 is 3-15 degrees. The powder selecting bin 30 is internally provided with a dynamic powder selecting machine 310, the dynamic powder selecting machine 310 consists of a rotor 311, an impact cone 312, a transmission shaft 313 and a powder selecting machine drive 314, blades of the rotor 311 are parallel to the inclined lining plate 301, the impact cone 312 is fixed at one end of the rotor 311 close to the feeding side, the diameter of the impact cone 312 is the same as the outer diameter of the rotor 311, and the impact cone 312 is used for controlling the speed of a material entering the dynamic powder selecting machine 310 and reducing the impact of the material on the blades of the dynamic powder selecting machine 310; secondly, if the bottom adopts the blind plate structure, the materials and the gas impact on the dynamic powder concentrator 310 at 90 degrees, and the gas has no guiding function when entering the blades of the dynamic powder concentrator 310, so that the general wind resistance is large. The rotor 311 is connected with a powder concentrator drive 314 outside the powder concentrator 30 through a transmission shaft 313, specifically, the powder concentrator drive 314 includes a speed reducer and a motor, and the transmission shaft 313 is connected with the motor through the speed reducer.
A first main partition board 40 is arranged between the grinding bin 20 and the powder selecting bin 30, and the thickness of the first main partition board 40 is 20-60 mm. The first main partition board 40 is provided with a first vent hole 401 positioned in the central area and a first grate seam 402 positioned on the periphery, the center of the first vent hole 401 is coaxial with the mill cylinder 10, the diameter of the first vent hole 401 is 0.2-0.4 times of the diameter of the mill cylinder 10, the first vent hole 401 is of a net structure, and the effective size of the net hole is 10-15 mm; a first grate seam 402 close to the periphery of the first vent 401 is a conical grate seam, the diameter of the first grate seam 402 is gradually increased from the side of the grinding bin 20 to the side of the powder selecting bin 30, the diameter of the first grate seam 402 close to the side of the grinding bin 20 is 4-10 mm, and the diameter of the first grate seam 402 close to the side of the powder selecting bin 30 is 6-12 mm; the first grate slit 402 close to the edge area of the first main partition plate 40 is in a long strip shape, and the length is 25mm and the width is 4mm.
The included angle between the feed inlet 101 and the axis of the cylinder body 10 is larger than 45 degrees, an external fixing structure is adopted, and the feed inlet does not rotate along with the cylinder body 10.
The material-preventing device 50 is arranged at the discharge end of the feed inlet 101, the material-preventing device 50 is mounted on a cylinder 10 of the ball mill and consists of a conical telescopic steel sheet 501, a light spring 502 and a lifting plate 503, the conical telescopic steel sheet 501 is positioned at the inner side of the lifting plate 503, the large-diameter end of the conical telescopic steel sheet 501 is fixed on the lifting plate 503, and the small-diameter end is connected with the lifting plate 503 through the light springs 502; the conical telescopic steel sheet 501 is formed by sequentially stacking a plurality of baffle pieces 5011, and each baffle piece 5011 corresponds to one light spring 502; the cross sections of the conical telescopic steel sheet 501 and the material raising plate 503 are circular. The length of the material raising plate 503 is 1.2-1.5 times of the horizontal length of the tapered telescopic steel sheet 501. When the material quantity is large, the light spring 502 is compressed, the blocking pieces 5011 of the conical telescopic steel sheet 501 can be unfolded to increase the diameter of the small-diameter end, the material passing area of the material scour prevention device 50 is increased, the smooth passing of the material is ensured, the problem of uneven impact load is solved, the uniform distribution of the material in the ball mill is realized, and the grinding efficiency of the ball mill is improved; when the material amount is small, the light spring 502 returns to the original position, the material passing area of the material impact prevention device 50 is reduced, and the material in the cylinder 10 is prevented from returning to the feeding hole 101.
The materials pass through the material preventing device 50 from the feeding hole 101 to enter the grinding bin 20 and enter the powder selecting bin 30 from the grinding bin 20, and the materials are sorted inside and outside the powder selecting bin 30; the sorted finished products are discharged from the discharge port 102 through the dynamic powder sorting machine 310, enter the next process, and the sorted non-finished products return to the grinding bin 20 again to be ground again under the action of gravity and centrifugal force, and enter the next circulation. The self-sorting ball mill can reduce the over-grinding of the ball mill, reduce fine powder agglomeration or ball pasting, improve the grinding efficiency, reduce the power consumption of grinding, reduce the height of a factory building, save the investment cost and be beneficial to energy conservation and environmental protection.
The self-sorting ball mill of the embodiment 1 is suitable for milling materials with the water content of the raw materials less than 2% and the granularity of the milled products less than 80 μm, can be used for processing materials such as raw materials, cement and coal powder in the field of building materials, and can also be used for grinding ultrafine materials in the field of non-metallic ores, such as ground calcium carbonate and talcum powder.
Example 2
Referring to fig. 6 to 8, different from embodiment 1, a static powder concentrator 320 is further disposed in the powder selecting bin 30 of this embodiment, and the static powder concentrator 320 is located between the first main partition board 40 and the dynamic powder concentrator 310.
The static powder concentrator 320 comprises static blades 321, the static blades 321 are arranged in a conical shape, an included angle between each static blade 321 and the axis of the barrel 10 is 45-65 degrees, the diameter of the section of the cone of each static blade 321 is gradually increased from the grinding bin 20 side to the powder concentration bin 30 side, one end, close to the grinding bin 20, of each static blade 321 is fixed on the corresponding main partition board I40, the other end of each static blade 321 is fixed on the corresponding barrel 10, the other end of each static blade is fixed on the inclined lining board 301 in the powder concentration bin 30, and the connection positions of the static blades 321 and the barrel 10 are connected in a welding mode. The length of the static blades 321 in the axial direction accounts for 15-25% of the length of the powder selecting bin 30, the width of each static blade 321 is 50-300 mm, and the gap between every two adjacent static blades 321 is 50-400 mm.
At this time, the inner region where the first main partition panel 40 and the conical static blades 321 intersect is a blind panel, the first vent holes 401 are not arranged, the outer region is provided with grid gaps, and the structure of the grid gaps is the same as the structure of the grid gaps 402 on the first main partition panel 40 in the embodiment 1.
After the materials enter the powder selecting bin 30 from the grinding bin 20, first powder selection is carried out on the conical static blades 321, then the fine powder passing through the static blades 321 is subjected to second selection through the dynamic powder selecting machine 310, the products after the second selection are finished products, and the semi-coarse powder not passing through the rotor 311 returns to the grinding bin 20 again to enter the next circulation.
The self-sorting ball mill in the embodiment 2 is suitable for milling materials with the water content of the raw materials less than 2% and the granularity of the milled products less than 80 μm, can be used for processing materials such as raw materials, cement and coal powder in the field of building materials, and can also be used for milling superfine materials such as ground calcium carbonate and talcum powder in the field of non-metallic ores.
Example 3
Referring to fig. 9 to 11, different from embodiment 1, a drying bin 60 is further disposed between the feeding port 101 and the grinding bin 20 in this embodiment, at this time, it is not necessary to make an included angle between the feeding port 101 and the cylinder 10 larger than 45 ° and dispose an anti-material stopper 50 at the feeding port 101 as in embodiment 1, in this embodiment, a feeding and conveying reamer 601 is disposed at the feeding port 101, and wet materials are spirally conveyed into the drying bin 60 by the feeding and conveying reamer 601.
A plurality of scattering devices 602 are arranged in the drying bin 60 and used for fully scattering materials, so that wet materials are dried in the drying bin 60; the height of the scattering devices 602 is 10-25% of the diameter of the cylinder 10, and the gap between two adjacent scattering devices 602 is 100-400 mm.
A second main partition board 70 is arranged between the drying bin 60 and the grinding bin 20, and the thickness of the second main partition board 70 is 20-60 mm. A second vent hole 701 positioned in the central area and a second grate seam 702 positioned around the second vent hole 701 are arranged on the second main partition board 70, and the edge area close to the second main partition board 70 is a blind plate; the center of the second vent hole 701 is coaxial with the mill cylinder 10, the diameter of the second vent hole 701 is 0.3-0.6 times of the diameter of the mill cylinder 10, the second vent hole 701 is of a net structure, and the effective size of a mesh hole is 15-30 mm; the second grate seam 702 is a conical grate seam, the diameter of the second grate seam 702 is gradually increased from the drying bin 60 side to the grinding bin 20 side, the diameter of the second grate seam 702 close to the drying bin 60 side is 10-15 mm, and the diameter of the second grate seam 702 close to the grinding bin 20 side is 20-30 mm, so that the grate seam is not easy to block.
The materials enter the drying bin 60 from the feeding hole 101 through the feeding conveying reamer 601, move from the drying bin 60 to the grinding bin 20 under the action of hot air, enter the powder selecting bin 30 from the grinding bin 20, and are sorted inside and outside the powder selecting bin 30; the sorted finished products are discharged from the discharge port 102 through the dynamic powder concentrator 310, and enter the next process, and the sorted non-finished products return to the grinding bin 20 again under the action of gravity and centrifugal force to be ground again, and enter the next cycle.
The self-sorting ball mill in the embodiment 3 is suitable for materials with 2-10% of water in the grinding raw material and a ground product granularity of less than 80 μm, and can be used for processing high-moisture materials such as wet fly ash, wet discharged slag, wet discharged steel slag tail mud and the like in the field of building materials.
Example 4
Referring to fig. 12 to 14, different from embodiment 1, the powder selecting bin 30 of this embodiment is not provided with the dynamic powder selecting machine 310, but only with the static powder selecting machine 320, and the rotation speed of the static powder selecting machine is the same as the rotation speed of the ball mill cylinder, and is slower, and belongs to coarse material sorting. The ratio of the length of the powder selecting bin 30 to the length of the whole ball mill cylinder 10 is 15-40%.
The static blades 321 of the static powder concentrator 320 are arranged parallel to the axis of the barrel 10, one end of the static blade 321 close to the grinding bin 20 is fixed on the first main partition board 40, the other end of the static blade 321 is fixed on the barrel 10, the connection positions are connected in a welding mode, and the static blade 321 occupies the whole powder concentrating bin 30. The width of each static vane 321 is 50-300 mm, and the gap between two adjacent static vanes 321 is 100-400 mm. The static blades 321 rotate along with the cylinder 10 to perform the function of coarse screening of materials.
At this time, the inner region where the first main partition panel 40 and the static blades 321 intersect is a blind plate, the outer region is provided with a grid seam, and the grid seam is a long-strip grid seam.
In this embodiment, only the static powder separator 320 is provided, so the whole ball mill can be set to a symmetrical structure, and materials can be fed from two ends of the ball mill and discharged from the middle of the ball mill.
In addition, the static vanes 321 of the static powder concentrator 320 in this embodiment may also be provided in a conical arrangement.
The materials respectively pass through the material guards 50 from the material inlets 101 at the two ends and enter the corresponding grinding bins 20, and the ground materials enter the powder selecting bin 30 along with the airflow; the static blades 321 in the powder selecting bin 30 are horizontally arranged, the fine materials after being selected enter the finished products along with the airflow and are discharged from the discharge port 102, and the coarse materials return to the grinding bin 20 and enter the next circulation until the finished products are obtained. The present embodiment further provides a dust collecting opening 103 above the discharging opening 102 for collecting dust.
The self-sorting ball mill of the embodiment 4 is suitable for materials with the water content of the grinding raw materials less than 2% and the granularity of the ground products more than 80 μm, can be used for processing materials such as machine-made sand in the field of building materials, and can also be used for producing medium and fine ores in the field of mineral separation.
The self-sorting ball mill can be applied to a combined grinding system with pre-grinding equipment, a self-sorting ball mill system for grinding superfine materials, a steel slag iron removal tail mud recycling treatment system and the like, and comprises the following specific steps:
example 5
Referring to fig. 15, an integrated grinding system using a self-sorting ball mill includes a roller press 3 (or an external circulation vertical mill), a combined powder concentrator 5, a cyclone 6, a self-sorting ball mill 7, and a first dust collector 8. The discharge hole of the roller press 3 (or the external circulation vertical mill) is connected with the feed hole of the combined type powder concentrator 5 through a hoister, the upper discharge hole of the combined type powder concentrator 5 is connected with the inlet of the cyclone 6, the discharge hole at the bottom of the cyclone 6 is connected with the feed hole 101 of the self-sorting type ball mill 7, and the discharge hole 102 of the self-sorting type ball mill 7 is connected with the inlet of the first dust collector 8.
The raw materials enter a buffer bin 2 through a first lifting machine 1 and then enter a roller press 3, after being crushed by the roller press 3, the raw materials enter a combined type powder concentrator 5 through a second lifting machine 4, fine materials separated by the combined type powder concentrator 5 enter a cyclone cylinder 6, coarse materials return to the roller press 3 to be crushed again, the fine materials are collected by the cyclone cylinder 6 and then conveyed to a self-separation type ball mill 7, and after further grinding and separation, the separated finished products enter a first dust collector 8 to be collected as finished products.
Example 6
Referring to fig. 16, a combined grinding system using a self-sorting ball mill includes a roller press 3 (or an external circulation vertical mill), a combined type powder concentrator 5, a first dust collector 8, a self-sorting ball mill 7, and a second dust collector 9. The discharge hole of the roller press 3 (or the external circulation vertical mill) is connected with the feed hole of the combined type powder concentrator 5 through a hoister, the upper discharge hole of the combined type powder concentrator 5 is connected with the inlet of the first dust collector 8, the middle discharge hole of the combined type powder concentrator 5 is connected with the feed hole 101 of the self-sorting type ball mill 7, and the discharge hole 102 of the self-sorting type ball mill 7 is connected with the inlet of the second dust collector 9.
Raw materials enter a buffer bin 2 through a first lifting machine 1, then enter a roller press 3, are crushed through the roller press 3, enter a combined type powder concentrator 5 through a second lifting machine 4, and fine materials separated through the combined type powder concentrator 5 enter a first dust collector 8 to be collected as finished products; conveying the intermediate material to a self-sorting type ball mill 7, further grinding and sorting, and feeding a sorted finished product into a second dust collector 9 to be collected as a finished product; the coarse material returns to the roller press 3 to be crushed again and enters the next combined grinding. And mixing the materials obtained by the first dust collector 8 and the second dust collector 9 as products and warehousing.
Example 7
Referring to fig. 17, a self-sorting ball mill system for grinding ultrafine materials includes a raw material bin 14, a belt scale 11, a self-sorting ball mill 7, and a first dust collector 8. The raw material bin 14 is connected with a feeding hole 101 of the self-sorting type ball mill 7 through a belt weigher 11, a discharging hole 102 of the self-sorting type ball mill 7 is connected with an inlet of a first dust collector 8, and an air outlet of the first dust collector 8 is connected with a fan.
Materials in the raw material bin 14 are conveyed to a self-sorting type ball mill 7 after being metered by a belt scale 11, the materials are ground in a grinding bin 20 and then enter a powder selecting bin 30 for sorting, sorted finished products enter a first dust collector 8, and sorted coarse powder returns to the grinding bin 20 to enter the next circulation; and the first dust collector 8 collects finished products and conveys the finished products to a finished product bin for storage.
Example 8
Referring to fig. 18, a recycling system for iron-removed tail mud of steel slag includes a filter press 12, a raw material bin 14, a feeding and conveying reamer 601, a biomass combustion furnace 13, a self-sorting ball mill 7, and a first dust collector 8. The self-sorting ball mill 7 in the system preferably adopts the self-sorting ball mill 7 in the embodiment 3, the filter press 12 is connected with an inlet of the raw material bin 14 through an adhesive tape machine, an outlet of the raw material bin 14 is connected with a feed inlet 101 of the self-sorting ball mill 7 through a metering device, a discharge outlet 102 of the self-sorting ball mill 7 is connected with an inlet of the first dust collector 8, and an air outlet of the first dust collector 8 is connected with a fan.
The filter press 12 dehydrates the steel slag iron-removing tail mud for the first time, the tail mud after the first dehydration enters the raw material bin 14, the materials discharged from the raw material bin 14 enter the feeding and conveying reamer 601 through the metering device, the feeding and conveying reamer 601 conveys the materials to the self-sorting ball mill 7, the materials are dried, ground and sorted inside and outside the self-sorting ball mill 7, and sorted finished products are collected in the first dust collector 8 and conveyed to the finished product bin for storage. The biomass combustion furnace 13 is a heat supply system of the self-sorting ball mill 7.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the teachings of the foregoing embodiments, or equivalents may be substituted for some or all of their features, without departing from the scope of the embodiments of the present invention.
Claims (10)
1. A self-sorting ball mill comprises a cylinder body, a feeding port and a discharging port, and is characterized in that the cylinder body inclines upwards from the feeding port side to the discharging port side, and the inclination angle is 2 to 5 degrees; a grinding bin and a powder selecting bin are sequentially arranged in the barrel from a feeding hole to a discharging hole, a plurality of activation rings are arranged in the grinding bin, an inclined lining plate is arranged on the inner wall of the barrel of the powder selecting bin, and a first main partition board is arranged between the grinding bin and the powder selecting bin; a static powder concentrator and/or a dynamic powder concentrator are arranged in the powder selecting bin;
when only the dynamic powder concentrator is arranged in the powder concentration bin, a first ventilation hole and a first grate seam are arranged on the first main partition board, the first ventilation hole is positioned in the central area, the first grate seam is positioned on the periphery of the first ventilation hole, the center of the first ventilation hole is coaxial with the mill barrel, and the first ventilation hole is of a net-shaped structure; a grate seam I close to the periphery of the vent hole I is a conical grate seam, and the diameter of the grate seam I is gradually increased from the grinding bin side to the powder selecting bin side; a first grate seam close to the edge area of the main partition board is a long strip-shaped grate seam;
the dynamic powder concentrator is composed of a rotor, a counterattack cone, a transmission shaft and a powder concentrator drive, wherein blades of the rotor are parallel to an inclined lining plate in a powder concentrator, the counterattack cone is fixed at one end of the rotor close to a feeding side, and the diameter of the counterattack cone is the same as the outer diameter of the rotor; the rotor is connected with the powder concentrator through a transmission shaft for driving;
the static powder concentrator comprises a static blade, one end of the static blade, which is close to the grinding bin, is fixed on the first main partition board, and the other end of the static blade is fixed on the barrel; the static blades are arranged in a conical shape or are arranged in parallel with the axis of the cylinder;
when the static blades are arranged in a conical shape, the included angle between the static blades and the axis of the cylinder body is 45 to 65 degrees, the diameter of the conical section of each static blade is gradually increased from the grinding bin side to the powder selecting bin side, at the moment, the inner area of the first main partition bin plate, which is intersected with the conical static blades, is a blind plate, and a grid seam is arranged in the outer area; when the static blades are arranged in parallel with the axis of the cylinder, the inner area of the first main partition board intersected with the static blades is a blind plate, and the outer area is provided with a grid seam.
2. The self-sorting ball mill according to claim 1, characterized in that a grinding lining plate is arranged on the inner wall of the cylinder body of the grinding bin; the included angle between the inclined lining plate and the axis of the cylinder body is 3-15 degrees.
3. The self-sorting ball mill according to claim 1, characterized in that when a static powder concentrator and a dynamic powder concentrator are arranged in the powder concentrator, static blades of the static powder concentrator are arranged in a conical shape, and the static powder concentrator is located between the first main partition plate and the dynamic powder concentrator.
4. The self-sorting ball mill according to claim 1, wherein the feed inlet and the cylinder axis have an included angle of more than 45 degrees, and an external fixed structure is adopted and does not rotate along with the cylinder.
5. The self-sorting ball mill according to claim 1, wherein a material impact prevention device is arranged at the discharge end of the feed inlet, the material impact prevention device is composed of a conical telescopic steel sheet, a light spring and a material lifting plate, the conical telescopic steel sheet is positioned at the inner side of the material lifting plate, the large diameter end of the conical telescopic steel sheet is fixed on the material lifting plate, and the small diameter end is connected with the material lifting plate through the light springs; the conical telescopic steel sheet is formed by sequentially stacking and enclosing a plurality of baffle plates, and each baffle plate corresponds to one light spring; the length of the material raising plate is larger than that of the conical telescopic steel sheet.
6. The self-sorting ball mill according to claim 1, characterized in that a drying bin is further disposed between the feeding port and the grinding bin, and a second main partition plate is disposed between the drying bin and the grinding bin.
7. The self-sorting ball mill according to claim 6, characterized in that a plurality of scattering devices are arranged in the drying bin, and the height of the scattering devices is 10 to 25 percent of the diameter of the cylinder body.
8. The self-sorting ball mill according to claim 6, characterized in that the second main partition plate is provided with a second vent hole located in the central region and a second grate seam located around the second vent hole, and the edge region close to the second main partition plate is a blind plate; the center of the second vent hole is coaxial with the mill cylinder, and the second vent hole is of a net structure; the second grate seam is a conical grate seam, and the diameter of the second grate seam is gradually increased from the side of the drying bin to the side of the grinding bin.
9. The self-sorting ball mill according to claim 6, characterized in that a feed conveying reamer is provided at the feed inlet.
10. The use of the self-classifying ball mill according to any one of claims 1 to 9, wherein the self-classifying ball mill is applicable to a combined grinding system with pre-grinding equipment, a self-classifying ball mill system for grinding ultrafine materials, or a steel slag iron removal tail mud recycling system.
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ZA776635B (en) * | 1976-11-26 | 1978-08-30 | Koppers Co Inc | Discharge splitter spout for a grinding mill |
CN102274782B (en) * | 2011-04-28 | 2013-12-04 | 华新环境工程有限公司 | Trumpet-shaped grinding and drying machine |
CN203184082U (en) * | 2013-03-21 | 2013-09-11 | 中建材(合肥)粉体科技装备有限公司 | Crushing ball mill with mill-tail powder selecting function |
CN206778579U (en) * | 2017-05-25 | 2017-12-22 | 南京腾韬工程技术有限公司 | Special purpose device in cement grinding mill |
CN107720331A (en) * | 2017-10-26 | 2018-02-23 | 重庆汇田机械制造有限公司 | Funneling buffer unit during blanking |
CN108405089A (en) * | 2018-03-10 | 2018-08-17 | 洛阳晟源新材料有限公司 | A kind of continuous feed pneumatic separation device |
CN109158316B (en) * | 2018-09-07 | 2024-04-23 | 天津水泥工业设计研究院有限公司 | Compact combined powder concentrator for material bed grinding system |
CN211755619U (en) * | 2020-04-03 | 2020-10-27 | 江苏鹏飞集团股份有限公司 | Grinding system |
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