CN113953065A - Combined grinding system with pre-grinding equipment - Google Patents
Combined grinding system with pre-grinding equipment Download PDFInfo
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- CN113953065A CN113953065A CN202111209964.3A CN202111209964A CN113953065A CN 113953065 A CN113953065 A CN 113953065A CN 202111209964 A CN202111209964 A CN 202111209964A CN 113953065 A CN113953065 A CN 113953065A
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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
- B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
- B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating 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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- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
本发明公开了一种带有预粉磨设备的联合粉磨系统，包括辊磨设备、组合式选粉机、收尘器一、自分选式球磨机、收尘器二和风机，辊磨设备与组合式选粉机连接，组合式选粉机上出料口与收尘器一入口连接，组合式选粉机的中间出料口与自分选式球磨机进料口连接，自分选式球磨机出料口与收尘器二入口连接；自分选式球磨机包括筒体，筒体自进料口侧至出料口侧向上倾斜、且依次设置研磨仓、选粉仓，研磨仓和选粉仓之间设置主隔仓板；选粉仓内设置有静态选粉机和/或动态选粉机。本发明可将预分选的细料收集、中粗料继续研磨分选，并能将粉磨过程中产生的合格细粉及时排出，减少球磨机内物料过粉磨，节约粉磨电耗，利于生产企业节能减排。
The invention discloses a combined grinding system with pre-grinding equipment. The combined powder separator is connected. The upper discharge port of the combined powder separator is connected to the first inlet of the dust collector. The middle discharge port of the combined powder separator is connected to the feed port of the self-separating ball mill, and the discharge port of the self-separating ball mill is connected. It is connected with the second inlet of the dust collector; the self-separating ball mill includes a cylinder, which is inclined upward from the side of the feed port to the side of the discharge port, and a grinding bin and a powder selecting bin are arranged in sequence, and the grinding bin and the powder selecting bin are arranged between the grinding bin and the powder selecting bin. Main compartment board; a static powder separator and/or a dynamic powder separator are arranged in the powder sorting bin. The invention can collect the pre-sorted fine materials, continue to grind and classify the medium and coarse materials, and can discharge the qualified fine powder generated in the grinding process in time, reduce the over-grinding of the materials in the ball mill, save the power consumption of grinding, and is beneficial to Energy saving and emission reduction of production enterprises.
Description
Technical Field
The invention relates to the technical field of grinding, in particular to a combined grinding system with pre-grinding equipment.
Background
The ball mill comprises a cylinder and a grinding body, when the ball mill cylinder rotates, the grinding body is attached to a cylinder lining plate and taken away by the cylinder due to the action of inertia, centrifugal force and friction force, when the ball mill cylinder is taken to a certain height, the ball mill is thrown down due to the gravity action of the ball mill cylinder, and the thrown-down 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 continuous normal production of a mill can be ensured; after grinding, 8% of silica fume (specific surface) is addedArea 2000m2/kg) are put into a powder concentrator together to realize that the specific surface area of the product is more than or equal to 800m2And the power consumption of the working procedure is up to 155 kW/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) sending the material ground by the ball mill into a powder selecting machine through a lifter, 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 surface 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 surface 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, and is connected with a powder selecting connecting pipe i and a powder selecting connecting pipe ii of a mill tail separation bin in parallel, a finished product conveying pipe, a catcher (cyclone and cloth bag type dust remover group), a fan, a stainless steel material return pipe, and a ball mill are sequentially connected in an air 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.
In addition, when the pre-sorted medium and coarse materials are continuously ground by the ball mill, if the ball mill adopts an open-flow process, the existing combined grinding system can cause the over-grinding phenomenon of the materials in the ball mill, the production power consumption is high, and the product quality control convenience is poor; if the circulation process is adopted, the powder concentrator needs to be arranged on a platform above the height of a ball mill plant, materials discharged from the ball mill need to be fed into the powder concentrator through a chute, a lifter and the like, the height of the whole workshop is 2 times larger than the height of the ball mill plant, the investment cost is high, a plurality of auxiliary equipment are provided, the production energy consumption is high, and the maintenance is difficult.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a combined grinding system with pre-grinding equipment, which can continuously grind and sort pre-sorted medium and coarse materials and discharge qualified fine powder generated in the grinding process in time, thereby reducing the phenomenon of fine powder agglomeration or over-grinding in a ball mill, improving the wind efficiency of the system, reducing the wind energy consumption of the system, reducing the workshop height, 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, a combined grinding system with pre-grinding equipment comprises roller mill equipment, a combined type powder concentrator, a first dust collector, a self-sorting type ball mill, a second dust collector and a fan, wherein a discharge hole of the roller mill equipment is connected with a feed inlet of the combined type powder concentrator through a hoisting machine, a discharge hole at the bottom of the combined type powder concentrator is connected with a feed inlet of the roller mill equipment, a discharge hole at the upper part of the combined type powder concentrator is connected with a first dust collector inlet, a first dust collector outlet is connected with the fan, a middle discharge hole of the combined type powder concentrator is connected with a self-sorting type ball mill feed inlet, a discharge hole of the self-sorting type ball mill is connected with a second dust collector inlet, and a second dust collector outlet is connected with the fan;
the self-sorting ball mill comprises a barrel, a feeding hole and a discharging hole, wherein the barrel 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 main partition board 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 concentration bin.
Preferably, an inclined lining plate is arranged on the inner wall 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 reaction 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 reaction cone is fixed at the bottom of the rotor, and the diameter of the reaction 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, the main bin partition plate is provided with vent holes positioned in a central area and grate seams positioned on the periphery, the center of each vent hole is coaxial with the mill barrel, the diameter of each vent hole is 0.2-0.4 times of that of the mill barrel, each vent hole is of a net structure, and the effective size of each mesh hole is 10-15 mm; the grate seam close to the periphery of the vent hole is a conical grate seam, the diameter of the grate seam is gradually increased from the grinding bin side to the powder selecting bin side, the diameter of the grate seam close to the grinding bin side is 4-10 mm, and the diameter of the grate seam close to the powder selecting bin side is 6-12 mm; the grate seam close to the edge area of the main partition plate is a long-strip-shaped grate seam, and the length is 25mm and the width is 4 mm; the thickness of the main partition bin plate 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 main bin separating plate 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 barrel 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 main partition board, and the other end of each static blade is fixed on the barrel; at the moment, the inner area of the intersection of the main partition plate and the conical static blades is a blind plate, and the outer area is provided with a grid seam; each static blade is 50-300 mm in width, and the gap between every 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 main bin partition plate, and the other end of each static blade is fixed on the cylinder body; at the moment, the inner area of the intersection of the main partition board and 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 every 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.
The invention has the following advantages and beneficial effects:
1) the grinding system can collect the pre-sorted fine materials and continuously grind and sort the medium and coarse materials, and can discharge qualified fine powder generated in the grinding process in time, thereby reducing the excessive grinding of the materials in the ball mill, saving the power consumption of grinding, and being beneficial to energy conservation and emission reduction of production enterprises.
2) The grinding system can shorten the finished product quality adjusting time, 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.
3) 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.
4) The self-sorting ball mill disclosed by the invention can integrate grinding and sorting, reduce the process flow, improve the air efficiency of the system, reduce the air volume by 50-70% compared with the traditional circulation system, and reduce the energy consumption of the air used by 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 flow chart of an integrated grinding system with pre-grinding equipment according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a self-sorting ball mill according to a first embodiment of the present invention;
FIG. 3 is a front view of a main compartment plate according to an embodiment of the present invention;
FIG. 4 is a sectional view of a main partition panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an anti-shock device according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an activation ring provided in accordance with one embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a self-classifying ball mill provided in the second embodiment of the present invention;
FIG. 8 is a front view of a main bulkhead according to a second embodiment of the present invention;
FIG. 9 is a sectional view of a main partition panel according to a second embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a self-sorting ball mill provided in the third embodiment of the present invention;
FIG. 11 is a front view of a second main compartment plate according to a third embodiment of the present invention;
fig. 12 is a sectional view of a main partition panel ii according to a third embodiment of the present invention.
In the figure: 1. a first hoist; 2. a buffer bin; 3. a roller mill device; 4. a second hoist; 5. a combined powder concentrator; 6. a first dust collector; 7. a self-sorting ball mill; 8. a first fan; 9. a second dust collector; 11. a second fan;
10. a barrel; 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. a powder selecting bin; 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 main partition panel; 401. a vent hole; 402. performing grate joint;
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.
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", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, 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 is to be noted that, unless otherwise explicitly specified or limited, 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, the present embodiment provides an integrated grinding system with pre-grinding equipment, which includes a roller mill 3 (a roller press or an external circulation vertical mill), a combined type powder concentrator 5, a first dust collector 6, a first fan 8, a self-sorting type ball mill 7, a second dust collector 9, and a second fan 11. The discharge hole of the roller mill device 3 (a roller press or an external circulation vertical mill) is connected with the feed inlet of the combined type powder concentrator 5 through the second elevator 4, the bottom discharge hole of the combined type powder concentrator 5 is connected with the feed inlet of the roller mill device 3, the upper discharge hole of the combined type powder concentrator 5 is connected with the first 6 inlets of the dust collectors, the first 6 air outlets of the dust collectors are connected with the first 8 blower, the middle discharge hole of the combined type powder concentrator 5 is connected with the feed inlet 101 of the self-sorting type ball mill 7, the discharge hole 102 of the self-sorting type ball mill 7 is connected with the second 9 inlets of the dust collectors, and the second 9 air outlets of the dust collectors are connected with the second 11 blower.
The raw materials enter a buffer bin 2 through a first lifting machine 1 and then enter a roller mill 3, the raw materials are crushed by the roller mill 3 and then enter a combined type powder concentrator 5 through a second lifting machine 4, and fine materials separated by the combined type powder concentrator 5 enter a dust collector I6 and are 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 materials return to the roller mill 3 to be crushed again and enter the next combined grinding. And mixing and warehousing the materials obtained by the first dust collector 6 and the second dust collector 9 as products, discharging the waste gas discharged from the first dust collector 6 and the second dust collector 9 into a chimney through respective corresponding fans, and finally discharging the waste gas into the atmosphere.
Referring to fig. 2 to 6, the self-sorting ball mill includes 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, a reaction 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 reaction cone 312 is fixed at the bottom of the rotor 311, the diameter of the reaction cone 312 is the same as the outer diameter of the rotor 311, and the reaction 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 comprises a speed reducer and a motor, and the transmission shaft 313 is connected with the motor through the speed reducer.
A main partition board 40 is arranged between the grinding bin 20 and the powder selecting bin 30, and the thickness of the main partition board 40 is 20-60 mm. The main partition board 40 is provided with a vent 401 positioned in the central area and grate gaps 402 positioned on the periphery, the center of the vent 401 is coaxial with the mill cylinder 10, the diameter of the vent 401 is 0.2-0.4 times of that of the mill cylinder 10, the vent 401 is of a net structure, and the effective size of meshes is 10-15 mm; the grate gap 402 close to the periphery of the vent 401 is a conical grate gap, the diameter of the grate gap 402 is gradually increased from the grinding bin 20 side to the powder selecting bin 30 side, the diameter of the grate gap 402 close to the grinding bin 20 side is 4-10 mm, and the diameter of the grate gap 402 close to the powder selecting bin 30 side is 6-12 mm; the slots 402 near the edge of the main partition 40 are elongated and have a dimension of 25mm in length and 4mm in width.
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 both 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 amount is large, the light spring 502 is compressed, each baffle 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 material is ensured to pass through smoothly, the problem of uneven impact load is solved, the material is uniformly distributed in the ball mill, 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 stopper 50 is reduced, and the material in the barrel 10 is ensured not to return to the feed inlet 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 grinding system of the embodiment 1 is suitable for grinding materials with the water content of the grinding raw material being less than 2% and the granularity of the ground product being 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. 7 to 9, different from embodiment 1, a static powder concentrator 320 is further disposed in the powder concentrator 30 of this embodiment, and the static powder concentrator 320 is located between the main partition plate 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, the included angle between the static blades 321 and the axis of the barrel 10 is 45-65 degrees, the diameter of the conical section 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 main bin partition plate 40, the other end of each static blade 321 is fixed on the barrel 10, specifically, the other end of each static blade is fixed on the inclined lining plate 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 main partition plate 40 and the tapered static blades 321 intersect is a blind plate, the vent holes 401 are not provided, the outer region is provided with a grid gap, and the structure of the grid gap is the same as the structure of the grid gap 402 on the main partition plate 40 in 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 finished products after the second selection are products, and the semi-coarse powder not passing through the rotor 311 returns to the grinding bin 20 again to enter the next circulation.
Example 3
Referring to fig. 10 to 12, unlike embodiment 1, the powder selecting bin 30 of the present embodiment is not provided with the dynamic powder selecting machine 310, but only provided with the static powder selecting machine 320. 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 main partition board 40, the other end of the static blade 321 is fixed on the barrel 10, the connection positions are all connected in a welding mode, and the static blade 321 occupies the whole powder concentrating bin 30. Each static blade 321 has a width of 50-300 mm, and a gap between two adjacent static blades 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 main partition panel 40 and the static blades 321 intersect is a blind plate, and the outer region is provided with a grid seam, which is a long-strip grid seam.
In this embodiment, only the static powder concentrator 320 is provided, so that the whole ball mill can be arranged in 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 finished products along with airflow and are discharged from the discharge port 102, and the coarse materials return to the grinding bin 20 and enter the next cycle 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 being less than 2% and the granularity of the ground products being 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.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but 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 technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
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| CN115283113A (en) * | 2022-03-24 | 2022-11-04 | 白银新银鑫工贸有限公司 | Feed additive and preparation process thereof |
| CN117463487A (en) * | 2023-11-24 | 2024-01-30 | 扬州一川镍业有限公司 | A pulverized coal preparation and transportation device suitable for coal-based spray guns |
| CN118002282A (en) * | 2024-03-22 | 2024-05-10 | 天津水泥工业设计研究院有限公司 | Combined grinding system with roller stirring and material grinding method |
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