CN104668044A - Inclined roll pressurized external circulating pulverizer - Google Patents
Inclined roll pressurized external circulating pulverizer Download PDFInfo
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- CN104668044A CN104668044A CN201510111072.8A CN201510111072A CN104668044A CN 104668044 A CN104668044 A CN 104668044A CN 201510111072 A CN201510111072 A CN 201510111072A CN 104668044 A CN104668044 A CN 104668044A
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Abstract
The invention discloses an inclined roll pressurized external circulating pulverizer. A central shaft bracket is mounted at the bottom of a pedestal of a main frame; grinding rings are mounted at the upper part of the pedestal; a hooding cylinder is mounted on the end face of the pedestal; the lower part of a spindle is mounted in the central shaft bracket; a grinding roller device is arranged at the upper part of the spindle; the grinding roller device comprises grinding roller racks and grinding rollers; the circumference of the grinding roller racks is uniformly and fixedly arranged on roller fixing racks and inclined downwards and outwards; the grinding rollers are mounted on the grinding roller racks and propped against the conical milling surfaces with larger upper parts and smaller lower parts of the grinding rings; the roller fixing rack is mounted at the upper end of the spindle; a material homogenizing disk is arranged at the upper part of the roller fixing rack and rotates coaxially with the roller fixing rack; a discharge hole of the main frame is formed in the bottom of the inner hole of the pedestal; scraping plates are arranged at the positions, corresponding to the discharge hole of the main frame, of the bottom of the pedestal; the circumference of the scraping plates is uniformly distributed and mounted on a material scraping frame; the material scraping frame and the roller fixing frame are coaxially and fixedly mounted; the discharge hole of the main frame is communicated with an outer-frame classification system. The inclined roll pressurized external circulating pulverizer disclosed by the invention is simple in structure, low in cost, prone to maintain, and short in replacement and maintenance time; as the pulverizer is free of material throwing motion of a scraper knife and the complicated and heavy grinding roller device, the loss of the total power can be greatly reduced.
Description
(1) technical field:
The present invention relates to powder process equipment, is a kind of cross roll pressurization outer circulation flour mill specifically.
(2) background technology:
Flour mill is breeze sector application equipment the most widely.
A kind of universal architecture of flour mill main frame is: main machine base is equipped with hollow central shaft bracket and coaxial bull ring and cover cylinder, grader installed by cover cylinder, main frame main shaft is located in central shaft bracket, fixed roll frame (or claiming plum blossom frame) is equipped with in the main frame main shaft upper end of stretching outside central shaft bracket, and the grinding roller assembly of circle distribution is located on fixed roll frame; In the process of revolution of grinding roller assembly, grinding roller assembly makes to keep Structure deformation between each grinding roller and bull ring by centrifugal action, mineral aggregate is pulverized by mutually rolling between grinding roller and bull ring, under system suction function, the breeze classified machine classification process suspended, the classified machine of qualified breeze is carried to collector, and defective breeze falls after rise bottom main machine base.
Mineral aggregate bottom main machine base is carried to the district that rolls between grinding roller and bull ring, mainly relies on relieving tool post drive the rotation of perching knife and realize, and in rotary course, described perching knife is by between oblique for mineral aggregate upthrow to the grinding roller and bull ring of corresponding setting.
In the process of perching knife upthrow mineral aggregate, the mineral aggregate of deposition produces resistance to perching knife, and perching knife overcomes the resistance acting of mineral aggregate, certainly will will consume the power of part main frame, and this is that this kind of flour mill yield in unit time is not high, one of the reason of inefficiency.
(3) summary of the invention:
For the deficiencies in the prior art, technical problem to be solved by this invention be propose a kind of by the cross roll pressurization outer circulation flour mill promoted for the purpose of working (machining) efficiency.
The cross roll pressurization outer circulation flour mill that can solve the problems of the technologies described above, comprise abrasive dust main frame, bottom the base endoporus of described abrasive dust main frame, central shaft bracket is installed, bull ring is installed on described base endoporus top, base end face mounting cup cylinder, main frame material inlet is opened in the upper cover of cover cylinder, main frame main shaft bottom is installed in central shaft bracket by bearing arrangement also stretches out connection for transmission mechanism downwards, main frame main shaft is installed the Burnisher apparatus of abrasive dust main frame, difference is that described Burnisher apparatus comprises fixed roll frame, grinding roller frame and grinding roller, described grinding roller frame circumference uniform distribution is on fixed roll frame and the oblique setting to outer lower side, the grinding roller with the described oblique free degree is installed by shaft of grinding roller and is butted on (included angle of grinding roller frame is identical with the cone angle of taper grinding face) on the up big and down small taper grinding face of bull ring on grinding roller frame, described fixed roll frame is installed on main frame main shaft upper end, the equal charging tray of coaxial rotation is provided with above described fixed roll frame, main frame discharging opening is opened in bottom base endoporus in central shaft bracket is other, corresponding to main frame discharging opening, material scraping plate is set bottom base endoporus, described material scraping plate circumference uniform distribution is installed on to be scraped on bin, described bin coaxial package and its top on central shaft bracket of scraping is connected with fixed roll frame, and main frame discharging opening is by the outer hierarchy system of pipeline connection machine, the outer hierarchy system of described machine comprises grading, lifting machine, grader and cyclone separator, abrasive dust main frame both sides are located at respectively by described grading, lifting machine and cyclone separator, described grader is located at above abrasive dust main frame, the charging aperture of grading, lifting machine is by pipeline connection main frame discharging opening, the discharging opening of grading, lifting machine passes through the charging aperture of pipeline connection grader, the qualified products of described grader enter cyclone collection by pipeline, and the substandard product of grader is by again milling in main frame material inlet backflow abrasive dust main frame.
In said structure, raw material enters in abrasive dust main frame through material inlet, (taper grinding face adds area of milling to fall into the taper grinding face of bull ring through equal charging tray distributed uniform, the weight fraction masterpiece of grinding roller adds grinding forces on bull ring) mill, material after milling drops on bottom base endoporus, is taken to main frame discharging opening fall into the outer hierarchy system of machine and carry out sorting by material scraping plate.
Grinding roller can be set up in sustained height position on fixed roll frame, then described grinding roller is in sustained height and becomes individual layer roller; Or described grinding roller is set up in the diverse location on fixed roll frame, then described grinding roller is in differing heights and becomes two-layer with top roll.
Conventionally described grinding roller frame be fixedly arranged on the upper and lower position on fixed roll frame and form the two-layer roller of upper and lower dislocation.
A kind of structure that grinding roller can be made to have the described oblique free degree is: described grinding roller frame is dual-layer Parallel quadric chain, the shaft of grinding roller of the hinge point difference hinge fixed roll frame that described parallel four-bar linkage is relative and grinding roller, described fixed roll frame is provided with grinding roller afterburning to improve the boosting mechanism of grinding forces, described boosting mechanism comprises folding shape boosting-rod, afterburning block, gusset, Compress Spring and hydraulic jack or cylinder, described hydraulic jack or cylinder are located at fixed roll top of the trellis central authorities, described gusset is with being located on piston rod that hydraulic jack or cylinder protrude upward, described folding shape boosting-rod corresponds to each grinding roller circumference uniform distribution and arranges, the folding shape position hinge dress of each folding shape boosting-rod, described Compress Spring press-fits between horizontal body of rod the inner, the inner side of folding shape boosting-rod and the plate body of gusset corresponding position, for equalizing pressure, described gusset is provided with the spring force adjusting part of regulating spring pressure size, the afterburning block vertical with described free degree direction is inclined in corresponding dual-layer Parallel quadric chain, afterburning block upper, lower end exceeds dual-layer Parallel quadric chain, the upper end of afterburning block is connected to the bottom of the vertical body of rod outside folding shape boosting-rod, described grinding roller upper, lower two ends exceed dual-layer Parallel quadric chain and are installed on afterburning block respectively, lower end stretches out bottom draw-in groove that position is offered, described draw-in groove direction is identical with described free degree direction.In said structure, described boosting mechanism acts on horizontal body of rod the inner (being equivalent to the drive end of lever) of folding shape boosting-rod downwards, bottom the vertical body of rod then rolling over shape boosting-rod (being equivalent to the driven end of lever) drive afterburning block to push grinding roller on bull ring, increase grinding roller in proper order to the grinding forces of bull ring; The setting of described hydraulic jack or cylinder is the adjustment facilitating grinding forces in order to process different materials.
The circumferential edges of described equal charging tray is provided with rib, prevents material from knocking cover cylinder because centrifugal force throws away and produces noise.
Beneficial effect of the present invention:
1, cross roll pressurization outer circulation flour mill of the present invention adopts outer circulation to be separated finished product, and air exhauster energy loss is little, and maintenance of equipment is convenient.
2, do not arrange perching knife in structure of the present invention, because of without material casting action, decrease power consumption, the total-power loss of abrasive dust main frame reduces greatly.
3, the material casting action produced owing to not having shovel blade mechanism in structure of the present invention, namely can not because of hard iron ore deposit, be scattered iron block and there is card machine or ruin machine situation occur.
4, the present invention adopts cross roll to mill material, and the gravity and the centrifugal force that achieve cross roll are exerted oneself simultaneously, improve grinding efficiency.
5, the present invention sets up boosting mechanism, is to facilitate grinding forces to regulate to process different material.
6, equal charging tray outer rim of the present invention is provided with backgauge limit, makes material not because centrifugal force throws away to knock cover cylinder and produce noise, and material is the unrestrained district that mills evenly, and it is more reasonable to distribute.
7, structure of the present invention is simple, cost is low, manufacture handling ease, is the preferred unit of flour mill of new generation.
(4) accompanying drawing illustrates:
Fig. 1 is the structural representation of one embodiment of the present invention.
Fig. 2 is the top view of Fig. 1 embodiment.
Fig. 3 is the structural representation of abrasive dust main frame in Fig. 1, Fig. 2 embodiment.
Fig. 4 is the A direction view in Fig. 3.
Figure number identifies: 1, abrasive dust main frame; 2 bases; 3, central shaft bracket; 4, bull ring; 5, cover cylinder; 6, main frame material inlet; 7, upper cover; 8, main frame main shaft; 9, grinding roller frame; 10, grinding roller; 11, fixed roll frame; 12, feed bin; 13, equal charging tray; 14, main frame discharging opening; 15, material scraping plate; 16, bin is scraped; 17, grading, lifting machine; 18, shape boosting-rod is rolled over; 19, grader; 20, cyclone separator; 21, shaft coupling; 22, blower fan; 23, afterburning block; 24, gusset; 25, Compress Spring; 26, hydraulic jack; 27, draw-in groove; 28, aggregate bin; 29, collecting box.
(5) detailed description of the invention:
Below in conjunction with accompanying drawing illustrated embodiment, technical scheme of the present invention is described further.
Cross roll pressurization outer circulation flour mill of the present invention comprises abrasive dust main frame 1 and the outer hierarchy system of machine.
The base 2 of described abrasive dust main frame 1 is fixed on concrete machine block, hollow central shaft bracket 3 is coaxially installed with bottom base 2 endoporus, bull ring 4 is coaxially installed on the top of base 2 endoporus, the flour milling of described bull ring 4 is up big and down small taper grinding face, coaxial mounting cup cylinder 5 on base 2 end face, described cover cylinder 5 is by upper cover 7 capping, and the center of described upper cover 7 offers main frame material inlet 6; Main frame main shaft 8 bottom of abrasive dust main frame 1 is installed in central shaft bracket 3 by the bearing arrangement of upper and lower, the lower end of main frame main shaft 8 is stretched out central shaft bracket 3 and is connected by the reductor of driven by motor by shaft coupling 21, and the Burnisher apparatus of abrasive dust main frame 1 is installed on the top (stretching out the part of central shaft bracket 3) of main frame main shaft 8 by fixed roll frame 11; Main frame discharging opening 14 is offered bottom base 2 endoporus that central shaft bracket 3 is other, adopt the mode blanking of material scraping plate 15 scraper, described material scraping plate 15 circumference uniform distribution is installed on to be scraped bottom bin 16 in base 2, describedly scrape bin 16 and central shaft bracket 3 coaxial package, top and the fixed roll frame 11 of scraping bin 16 are coaxially fixedly mounted with, and the outer hierarchy system of described machine is by pipeline connection main frame discharging opening 14; Above fixed roll frame 11, installed the equal charging tray 13 of coaxial rotation by support, the circumferential edges of described equal charging tray 13 is provided with rib, as shown in Figure 3.
Described Burnisher apparatus comprises grinding roller frame 9 and grinding roller 10, described grinding roller frame 9 circumference uniform distribution to be fixedly arranged on fixed roll frame 11 and the oblique setting to outer lower side, described grinding roller 10 is installed by shaft of grinding roller and is butted on the up big and down small taper grinding face of bull ring 4 on grinding roller frame 9, the included angle of grinding roller frame 9 is identical with the cone angle of taper grinding face, in described Burnisher apparatus, described grinding roller 10 has in described oblique free-moving function, as shown in Figure 3.
The grinding roller frame 9 of described Burnisher apparatus is fixedly arranged on the sustained height position on fixed roll frame 11, then multiple grinding roller 10 is in same aspect and forms individual layer roller, or the grinding roller frame 9 of described Burnisher apparatus is fixedly arranged on the upper and lower height and position of fixed roll frame 11, then the grinding roller 10 of half is in aspect and is obliquely butted on the upper taper grinding face of bull ring 4, second half grinding roller 10 is in subsurface and is obliquely butted on the lower taper grinding face of bull ring 4, and the grinding roller 10 of upper and lower layer forms double-deck roll structure and stagger in grinding roller 10 position of upper and lower layer.
The version that grinding roller 10 can be made to have the described oblique free degree is:
Described grinding roller frame 9 is upper and lower dual-layer Parallel quadric chain, the shaft of grinding roller of the hinge point difference hinge fixed roll frame 11 that described parallel four-bar linkage is relative and grinding roller 10.
In mill processes, described structure can the wearing and tearing of auto-compensation grinding roller 10, and effectively can dodge the material of district's bulk of milling.
For improving grinding forces, described fixed roll frame 11 is provided with the boosting mechanism along described oblique promotion grinding roller 10, described boosting mechanism comprises " 7 " font folding shape boosting-rod 18 (comprising the top horizontal body of rod in inner side and the vertical body of rod in outside), afterburning block 23, gusset 24, Compress Spring 25 and hydraulic jack 26, described hydraulic jack 26 is installed on fixed roll frame 11 center of top below equal charging tray 13 by oil cylinder seat, described gusset 24 is coaxially installed on the piston rod that hydraulic jack 26 protrudes upward, described folding shape boosting-rod 18 corresponds to each grinding roller 10 circumference uniform distribution and arranges, the folding shape position hinge of each folding shape boosting-rod 18 is loaded on fixed roll frame 11, described Compress Spring 25 press-fits between horizontal body of rod the inner and the plate body of gusset 24 corresponding position of folding shape boosting-rod 18, the afterburning block 23 vertical with described free degree direction is inclined in corresponding dual-layer Parallel quadric chain and (dodges out grinding roller 10), afterburning block 23 upper, lower end exceeds dual-layer Parallel quadric chain, wherein, the upper end of afterburning block 23 is connected to the vertical body of rod bottom of folding shape boosting-rod 18, described grinding roller 10 upper, lower two ends exceed dual-layer Parallel quadric chain and are installed on afterburning block 23 respectively, lower end stretches out bottom draw-in groove 27 that position is offered, described draw-in groove 27 direction is identical with described free degree direction, owing to have employed the boosting mechanism of described structure, thus grinding roller 10 is made to produce extra pressure to bull ring 4, when abrasive dust main frame 1 works, the centrifugal force of extra pressure and grinding roller 10 and the weight component of grinding roller 10 synthesize the grinding pressure between grinding roller 10 and bull ring 4 jointly, as shown in Figure 3, Figure 4.
Described main frame discharging opening 14 is by the outer hierarchy system of pipeline connection machine.
The outer hierarchy system of described machine comprises grading, lifting machine 17, grader 19 and cyclone separator 20, the left side of abrasive dust main frame 1 is located at by described grading, lifting machine 17, the right side of abrasive dust main frame 1 is located at by described cyclone separator 20, described grader 19 is installed on above abrasive dust main frame 1 by frame, described main frame discharging opening 14 is by the charging aperture bottom the pipeline connection grading, lifting machine 17 of oblique below, the discharging opening at grading, lifting machine 17 top passes through the charging aperture of the pipeline connection grader 19 of oblique below, the discharging opening of grader 19 qualified products passes through the charging aperture of horizontal pipeline connection cyclone separator 20, grader 19 substandard product to be refluxed main frame material inlet 6 by aggregate bin 28, described main frame material inlet 6 is also by the discharging opening of the pipeline connection feed bin 12 of oblique top, as Fig. 1, Fig. 2, shown in Fig. 3.
In the outer hierarchy system of described machine, the negative pressure of grader 19 and cyclone separator 20 is produced by blower fan 22, and the qualified powder of grader 19 is sent in cyclone separator 20 and carried out separation of air from dust, and the powder of separation is finished product, and finished product comes together in collecting box 29; The defective material of grader 19 falls to the aggregate bin 28 of grader 19, together to fall on equal charging tray 13 and evenly scatters and mill to the district that mills, so constantly circulate through the reflux raw material that continues to import with feed bin 12 in abrasive dust main frame 1 of main frame material inlet 6.
Claims (5)
1. cross roll pressurization outer circulation flour mill, comprise abrasive dust main frame (1), bottom base (2) endoporus of described abrasive dust main frame (1), central shaft bracket (3) is installed, bull ring (4) is installed on described base (2) endoporus top, base (2) end face mounting cup cylinder (5), main frame material inlet (6) is opened in the upper cover (7) of cover cylinder (5), main frame main shaft (8) bottom to be installed in central shaft bracket (3) by bearing arrangement and to stretch out connection for transmission mechanism downwards, the upper Burnisher apparatus installing abrasive dust main frame (1) of main frame main shaft (8), it is characterized in that: described Burnisher apparatus comprises fixed roll frame (11), grinding roller frame (9) and grinding roller (10), described grinding roller frame (9) circumference uniform distribution is gone up and the oblique setting to outer lower side in fixed roll frame (11), the grinding roller (10) with the described oblique free degree is installed by shaft of grinding roller in grinding roller frame (9) is upper and is butted on the up big and down small taper grinding face of bull ring (4), described fixed roll frame (11) is installed on main frame main shaft (8) upper end, described fixed roll frame (11) top is provided with the equal charging tray (13) of coaxial rotation, main frame discharging opening (14) is opened in bottom base (2) endoporus in central shaft bracket (3) is other, corresponding to main frame discharging opening (14), material scraping plate (15) is set bottom base (2) endoporus, described material scraping plate (15) circumference uniform distribution is installed on to be scraped on bin (16), described scrape bin (16) in the upper coaxial package of central shaft bracket (3) and its top be connected with fixed roll frame (11), main frame discharging opening (14) is by pipeline connection machine hierarchy system outward, the outer hierarchy system of described machine comprises grading, lifting machine (17), grader (19) and cyclone separator (20), abrasive dust main frame (1) both sides are located at respectively by described grading, lifting machine (17) and cyclone separator (20), abrasive dust main frame (1) top is located at by described grader (19), the charging aperture of grading, lifting machine (17) is by pipeline connection main frame discharging opening (14), the discharging opening of grading, lifting machine (17) passes through the charging aperture of pipeline connection grader (19), the qualified products of described grader (19) enter cyclone separator (20) by pipeline and collect, the substandard product of grader (19) is by again milling in main frame material inlet (6) backflow abrasive dust main frame (1).
2. cross roll pressurization outer circulation flour mill according to claim 1, it is characterized in that: described grinding roller frame (9) is located at the upper sustained height position of fixed roll frame (11), and described grinding roller (10) is in sustained height and becomes individual layer roller; Or described grinding roller frame (9) is located at the diverse location on fixed roll frame (11), described grinding roller (10) is in differing heights and becomes two-layer with top roll.
3. cross roll pressurization outer circulation flour mill according to claim 1, is characterized in that: described grinding roller frame (9) is fixedly arranged on the upper and lower position on fixed roll frame (11) and forms the two-layer roller of upper and lower dislocation.
4. according to the cross roll pressurization outer circulation flour mill in claims 1 to 3 described in any one, it is characterized in that the structure that grinding roller (10) can be made to have the described oblique free degree is: described grinding roller frame (9) is dual-layer Parallel quadric chain, the shaft of grinding roller of hinge point difference hinge fixed roll frame (11) that described parallel four-bar linkage is relative and grinding roller (10), described fixed roll frame (11) is provided with grinding roller (10) afterburning to improve the boosting mechanism of grinding forces, described boosting mechanism comprises folding shape boosting-rod (18), afterburning block (23), gusset (24), Compress Spring (25) and hydraulic jack (26) or cylinder, described hydraulic jack (26) or cylinder are located at fixed roll frame (11) center of top, described gusset (24) is with being located on piston rod that hydraulic jack (26) or cylinder protrude upward, described folding shape boosting-rod (18) is arranged corresponding to each grinding roller (10) circumference uniform distribution, the folding shape position hinge dress of each folding shape boosting-rod (18), described Compress Spring (25) press-fits between and the plate body of gusset (24) corresponding position inner in the horizontal body of rod in the inner side of folding shape boosting-rod (18), the afterburning block (23) vertical with described free degree direction is inclined in corresponding dual-layer Parallel quadric chain, afterburning block (23) upper, lower end exceeds dual-layer Parallel quadric chain, the upper end of afterburning block (23) is connected to the bottom of the vertical body of rod in folding shape boosting-rod (18) outside, described grinding roller (10) upper, lower two ends exceed dual-layer Parallel quadric chain and are installed on afterburning block (23) respectively, lower end stretches out draw-in groove (27) bottom that position is offered, described draw-in groove (27) direction is identical with described free degree direction.
5., according to the cross roll pressurization outer circulation flour mill in claims 1 to 3 described in any one, it is characterized in that: the circumferential edges of described equal charging tray (13) is provided with rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510111072.8A CN104668044B (en) | 2015-03-13 | 2015-03-13 | Cross roll pressurization outer circulation flour mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510111072.8A CN104668044B (en) | 2015-03-13 | 2015-03-13 | Cross roll pressurization outer circulation flour mill |
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| CN104668044A true CN104668044A (en) | 2015-06-03 |
| CN104668044B CN104668044B (en) | 2017-03-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105944797A (en) * | 2016-07-01 | 2016-09-21 | 桂林晟兴机械制造有限公司 | Outer circulation pulverizer |
| CN106000552A (en) * | 2016-07-01 | 2016-10-12 | 桂林晟兴机械制造有限公司 | Vertical outer circulation pulverizer |
| CN106345579A (en) * | 2016-09-20 | 2017-01-25 | 派勒（天津）纳米技术有限公司 | Grading barrel of dry type ball-milling system |
| CN109569842A (en) * | 2018-11-26 | 2019-04-05 | 江苏鹏飞集团股份有限公司 | Circular grinding cement vertical mill with preheating grinding function |
| WO2021093255A1 (en) * | 2019-11-15 | 2021-05-20 | 南京钜力智能制造技术研究院有限公司 | External circulation roller type vertical mill |
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| CN104399562A (en) * | 2014-11-20 | 2015-03-11 | 桂林晟兴机械制造有限公司 | External-circulating ball roller way-type mill |
| CN204564238U (en) * | 2015-03-13 | 2015-08-19 | 桂林晟兴机械制造有限公司 | Cross roll pressurization outer circulation flour mill |
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| CN203002427U (en) * | 2012-10-29 | 2013-06-19 | 桂林晟兴机械制造有限公司 | Automatic supercharging device for grinding roller of flour mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105944797A (en) * | 2016-07-01 | 2016-09-21 | 桂林晟兴机械制造有限公司 | Outer circulation pulverizer |
| CN106000552A (en) * | 2016-07-01 | 2016-10-12 | 桂林晟兴机械制造有限公司 | Vertical outer circulation pulverizer |
| CN105944797B (en) * | 2016-07-01 | 2018-04-10 | 桂林晟兴机械制造有限公司 | Outer circulation flour mill |
| CN106345579A (en) * | 2016-09-20 | 2017-01-25 | 派勒（天津）纳米技术有限公司 | Grading barrel of dry type ball-milling system |
| CN109569842A (en) * | 2018-11-26 | 2019-04-05 | 江苏鹏飞集团股份有限公司 | Circular grinding cement vertical mill with preheating grinding function |
| WO2021093255A1 (en) * | 2019-11-15 | 2021-05-20 | 南京钜力智能制造技术研究院有限公司 | External circulation roller type vertical mill |
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|---|---|
| CN104668044B (en) | 2017-03-01 |
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