CN206996733U - Simultaneously coil spring bitubular double-mass vibrating is not ground convexity - Google Patents
Simultaneously coil spring bitubular double-mass vibrating is not ground convexity Download PDFInfo
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- CN206996733U CN206996733U CN201720794193.1U CN201720794193U CN206996733U CN 206996733 U CN206996733 U CN 206996733U CN 201720794193 U CN201720794193 U CN 201720794193U CN 206996733 U CN206996733 U CN 206996733U
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Abstract
The utility model is that simultaneously coil spring bitubular double-mass vibrating is not ground a kind of convexity, including main vibrating system and vibrating isolation system, main vibrating system includes motor, exciter shaft is connected with motor outer shaft by shaft coupling, between the support consolidation and upper cylinder and lower cylinder of exciter shaft, vibrator is between upper the plastid up and down connecting plate of mill tube, as the exciting source of whole grinding machine, vibrating isolation system includes the lower plastid being connected with main vibration spring group, the other end of lower plastid is connected with isolation spring, and isolation spring is connected by base with ground；Main vibration spring group is made up of several middle convex not doubling-up helical springs, and each spring forms by a steel wire coil around structure.The utility model has the characteristics that ultramicro powder refinement, de-agglomerated, powder product distribution, and band narrows, energy consumption is low, mill efficiency is high, capacity usage ratio is high and effective accumulation of energy, energy-conservation, steady running, to significantly reduce noise, vibration isolating effect good.
Description
Technical field
Milling equipment prepared by a kind of superfine powder vibration is the utility model is related to, is that one kind has middle convex not doubling-up bullet
Spring, medium are the bitubular double-mass vibrating mill of hybrid density proportioning, belong to vibration using the interdisciplinary science technology with powder technology.
Background technology
Vibromill is the vibrating mechanical equipment that material fining grinding operation is completed using vibration principle, existing superfine powder
In technology of preparing, vibromill is with other preparation methods if any gas phase synthesis method, liquid phase synthesizing method, comminution by gas stream, roller mill method
Etc. comparing, there is the advantages such as mechanical mass activity is big, purification is convenient, cost is low, simple in construction, efficiency is high, existing vibromill branch
Support spring typically uses line style equal pitch helical spring；Its medium generally uses isodensity medium, and such as abrasion-resistant stee, zirconium oxide are single
One density medium；Body is commonly elemental body structure.
The elemental body structure of vibromill, show between the vibration plastid and base that are made up of cylinder and vibrator, be to pass through
Spiral compression spring is connected, and is vibrated caused by vibration plastid, ground can be directly acted on by spring pedestal, produced larger with making an uproar
Sound, therefore it is larger to consume energy.In recent years, or the research report that there is double-mass vibrating to grind, but due to double-mass vibrating mill be related to it is main every
Vibrating system designs, and its structure is relative complex, cost is higher, therefore practical application person rarely has news.
In Practical Project, the parameter such as vibrational system quality, exciting force, damping force is mostly change person, such as vibromill
The mill that medium, the grinding charge material of system in itself are formed, which is situated between, to flow, and constantly throws, falls in motion process, and actually one
Nonlinear change can also occur wherein for the process of individual complicated mass change, damping, and the bias that the inclined block of vibrating motor is formed swashs
Power of shaking be with the change of corner and change it is non-linear, vibration grinding system be actually a typical nonlinear system, be
One has the strong nonlinear vibration system for determining excitation and uncertain response.
The load character curve for the equal pitch helical spring that existing vibromill generally uses is linear line, to wait stiffness helix
Spring, the actual condition of mission nonlinear, such as jigging conveyer, vibrating scalper, vibrating mill are not accounted for, due to moving shape
The system load moment is all changing under state, therefore the stiffness helix spring such as uses, though there is simple in construction, low cost and other advantages, so deposits
In the problem such as noise is big, power consumption is high, efficiency is low, the maintenance frequency is high, equipment life is low.
Normal spiral spring is linear characteristic wire spring, and its load is linear with deforming；Variable-pitch screw spring is then
For nonlinear characteristic wire spring, its load is in non-linear relation with deformation, has special performance, the load of all of which reaches
After to a certain degree, the stress in material section is changed along the length of material.Therefore, the size of material will be according to maximum
Stress determines；The height or length of spring will determine according to deformation required after stand under load.
Normal linear spring can not realize variation rigidity, then can not realize and the vibration coupling of above-mentioned complex vibration system or association
Vibration is adjusted, thus efficiency is low, energy consumption is big, noise is big.How so that the change of vibrational system rigidity and elastic force, with its in system
The active force that it varies goes to realize vibration coupling, is that the worth the problem of inquired into is practical to reach the purpose of efficient energy-saving
It is new.
Recent domestic experts and scholars are inquiring into the solution of above mentioned problem always, though there is non-linear variable-pitch screw
The application report of metal spring, but the problem of noise is bigger when still suffering from noise big, doubling-up, used in nonlinear vibration motivation,
Easily there is the problems such as short life, the maintenance frequency is high, cost is high.
In summary, while the new grinding machine with efficient energy-saving of above mentioned problem is overcome not yet to be suggested so far.
The content of the invention
The utility model provides a kind of middle convex, and simultaneously coil spring, hybrid density medium bitubular double-mass vibrating are not ground, and are had
Double mass technical characteristic, main vibration spring are middle convex not simultaneously coil spring, and isolation spring is rubber duck complex spring, master-vibration isolation
Spring is variation rigidity；It is to improve to grind impact of Jie's ball in relative motion, extruding, shearing, the energy of collision in cylinder, implements mixed
Close density medium ratio optimization to set, compared with existing widely used common double tube mill, there is obvious efficiency high, noise
The features such as small, it is intended to effectively solve existing vibromill all the time, the technical bottlenecks such as pendent noise is big, efficiency is low are asked
Topic.
New bitubular double-mass vibrating mill of the present utility model takes following technology to realize：
The utility model is that simultaneously coil spring bitubular double-mass vibrating is not ground a kind of convexity, including main vibrating system and vibration isolation system
System,
Main vibrating system includes the motor being arranged on electric machine support by Frequency Converter Control, outside exciter shaft and motor
Axle is connected by shaft coupling, and exciter shaft is arranged on support, between the support consolidation and upper cylinder and lower cylinder of exciter shaft, group
Into upper plastid, upper and lower mill tube is arranged on plastid, and vibrator turns into whole between upper the plastid up and down connecting plate of mill tube
The exciting source of individual grinding machine,
Vibrating isolation system includes the lower plastid being connected with main vibration spring group, and the other end of lower plastid is connected with isolation spring, every
The spring that shakes is connected by base with ground；
Main vibration spring group is made up of several middle convex not doubling-up helical springs, each spring by a steel wire coil around structure and
Into, steel wire is wound into convexity type helical structure, and middle convex not doubling-up helical spring at least encloses the effective helix angle of the above, and effectively
The effective pitch of spiral is the spiral of equal pitch, and spiral central diameter is distributed in Rearrangments from the middle to both ends.
Further improvement of the utility model is：Middle convex not doubling-up helical spring edge and electronic owner in vibromill
Axle vertical direction puts several rows, is placed several rows along with electric machine main shaft parallel direction, forms the uniform state of spring.
Further improvement of the utility model is：Isolation spring is to use composite, such as rubber duck composite
Isolation spring is made.
Further improvement of the utility model is：The mill is situated between matches somebody with somebody for the medium of two or more different densities
Than.
The bitubular of the present utility model also two be exactly double mill tubes mainly include with double mass structure upper and lower mill tube, upper plastid, under
The parts such as plastid, motor, vibrator, main vibration spring, shock-absorbing spring, base；Wherein mill tube is consolidated on plastid；On
It is connected between plastid and lower plastid by the spring guide pillar in main vibration spring group and upper and lower plastid；Lower plastid passes through vibration damping bullet
Spring is supported on base；Vibrator turns into the exciting source of whole grinding machine between upper the plastid up and down connecting plate of mill tube.Work
When, upper and lower plastid is vibrated with different amplitudes and acceleration, it is clear that the amplitude and acceleration of upper plastid are larger, can improve mill tube
Impact grinding ability of the interior medium to material；The amplitude and acceleration of lower plastid are smaller, then can be greatly reduced by isolation spring
It is transmitted to the dynamic loading on basis.
Vibrator rotating shaft is connected with motor outer shaft by shaft coupling in main vibrating system；The support consolidation of vibrator rotating shaft
Between upper lower shell, plastid on composition, and be connected by main vibration spring with vibrating isolation system；Lower plastid one end and main vibration spring phase
Even, the other end is connected with isolation spring, and isolation spring is connected by fixed bottom plate with ground, after energization, by Frequency Converter Control electricity
Motivation, to change exciting force, vibrator makees approximate circle vibration with mill tube so that and mill, which is situated between, in mill tube produces mutually motion,
So, in cylinder and be adhered to mill be situated between and barrel on powder due to mill be situated between and the mill shock, shearing, the stranding that are situated between with material
Rub to reach the purpose of grinding, the double-mass vibrating mill passes through two groups of springs of main vibration spring and isolation spring, can be obvious
Vibromill main body is reduced to oscillation intensity caused by ground and noise, and has reached the effect of energy-conservation, due to isolation spring and ground
Base is connected by firm banking, can prevent moving horizontally for vibrating mill.
The main vibration spring group of the utility model grinding machine is made up of some middle convex not doubling-up helical springs, wherein each
Spring forms by a steel wire coil around structure, and described steel wire is wound into middle convex helical structure, middle convex according to design data
The Parameters variations such as the design visible system quality of spring, exciting force are designed, and middle convex not doubling-up helical spring at least 4 encloses
More than effective helix angle, and the effective pitch of effective helix angle be equal pitch spiral, spiral central diameter from centre to both ends typically in
Rearrangments are distributed.
The load envnlope line of the middle convex not doubling-up helical spring is cumulative type non-linear line, and be it is continuous or point
Section is continuous, and this is advantageous to the generation for preventing its resonance and flutter；Due to the change of central diameter, in identical steel wire diameter same pitch
In the case of, decrement during adjacent two steel wires doubling-up, middle convex spring is big compared with common spring, special according to the structure of this spring
Point, consider the condition of not doubling-up, the not doubling-up of grinder system main vibration spring can be achieved, can return noise caused by spring doubling-up
Zero.
Due to the central diameter change of the helical structure of convex not doubling-up helical spring in composition, there is the utility model obvious
Non-linear and required variation rigidity feature, i.e., the utility model spring form system stiffness have increases and decreases with loads increasing or decreasing
Variation rigidity feature, make the effective accumulation of energy of system, energy-conservation, steady running, the purpose for significantly reducing noise to reach.
The middle convex not doubling-up helical spring group formula double-mass vibrating mill, middle convex not doubling-up helical spring is in vibromill
Middle edge put with electric machine main shaft vertical direction it is multiple rows of, along and electric machine main shaft parallel direction place some rows, form the uniform state of spring,
So that vibromill preferably works.
Isolation spring can be made of rubber duck composite in the utility model, and lower plastid passes through isolation spring and bottom
Seat is connected with ground, and because isolation spring has hard nonlinear characteristic, its rigidity has the characteristics of changing with load change, can
Preferable noise reduction is obtained, the purpose of firm banking mainly prevents movement of the vibromill in the horizontal direction in face.
Vibromill is to utilize the vibration for vibrating mill tube generation certain frequency so that the medium such as ball or rod in cylinder produces inertia
Power has compact-sized, volume with comminuting matter, the acceleration of mill tube vibration to complete to impact typically up to 6g-12g
Small, in light weight, properties of powder performace concentration, process simplification, it is simple to operate, easy to maintenance, liner plate Medium Replacement is easy the advantages that, can be wide
It is general to be used for the industry powder such as metallurgy, building materials, mine, fire resisting, chemical industry, glass, ceramics, graphite.
The medium that existing vibromill technology uses, size can be entered according to different material by experiment or numerical simulation
Row compares, and to determine optimum gradation, its right density is chosen like all single density mediums, typically using forged steel, abrasion-resistant stee,
Wear resistant cast iron, high chrome, middle chromium steel etc., its shape can be spherical or round bar shape, but mill tube to be further added by and media impingement thing
Acceleration during material, single density medium is almost helpless, and appropriate Jie from two or more different densities
Matter matches, and such as wolfram steel, abrasion-resistant stee, in throwing, in collision process for grinding process, because its density of material differs about 2 times, then leads
Cause that mill in cylinder is situated between involve, relative velocity and involve, the motion value such as relative acceleration increases severely, necessarily cause its impact energy
Amount greatly improves, and turns into the necessary condition for improving mill efficiency.
The realization of hybrid density media technology main points, it is a variety of to can reach generation impact, shearing, extruding etc. in grinding operation
The Practical Project effect of the combining ability effect of power, some work barrier for overcoming vibrating machine, it is special to solve vibrating machine
It is some key technologies of vibromill or restricts the bottleneck problem developed, does not refine, easily rolls into a ball as solved ultramicro powder in vibromill
Poly-, powder product is distributed the problems such as band is big compared with wide and energy consumption, mill efficiency is low, capacity usage ratio is low, and then realizes material
Ultra-fine or ultramicro grinding, reduce energy consumption, improve efficiency, there is significant engineering effort, economic and social benefit, due to high density
Medium, which uses, causes the financial cost that grinding machine exciting power is slightly lifted, right compared with economic benefit caused by the utility model
It can be ignored substantially in the target for pursuing high-quality powder.
The beneficial effects of the utility model are：Vibrating mill described in the utility model compared with common elemental body grinding machine, by
In with main vibrating isolation system, bigger exciting force on the one hand can be born, on the other hand can effectively reduce vibrating mill to ground
Vibration effect, reach good energy-saving effect；The main vibration spring and the rigidity of isolation spring can carry with grinder system is maximum
The change of lotus and change, can not only have accumulation of energy, the effect of energy-conservation, and provide necessary condition for the coupled vibrations of main vibration isolation,
Not doubling-up of the main vibration spring under possible maximum load so that system noise significantly reduces and dynamic stability greatly increases, whole
Engine efficiency is obviously improved；It is close from medium compared with existing grinder system in the case of hybrid density medium size composition optimal design-aside
The examination of this angle is spent, it is even more apparent to improve the advantages such as high, the reduction energy consumption of system effectiveness.
In summary, be using effect of the present utility model it is positive, obvious and unique, its have ultramicro powder refinement,
De-agglomerated, powder product distribution band narrows, energy consumption is low, mill efficiency is high, capacity usage ratio is high and effective accumulation of energy, energy-conservation, surely
Operate calmly, significantly reduce the features such as noise, vibration isolating effect are good.Above-mentioned technology of the present utility model, effectively solving existing vibration
Grind in the technical bottleneck problems such as pendent energy consumption is big all the time, efficiency is low, the step crossed over will be realized.
Brief description of the drawings
Fig. 1 is the utility model vibromill structural representation.
Fig. 2 is convex not doubling-up helical spring structure schematic diagram in the utility model.
Fig. 3 is convex spring adjacent turn not doubling-up schematic diagram in the utility model.
Wherein：1- supports, plastid under 2-, 3- main vibration spring groups, 4- connecting tubes, 5- flanges, the upper cylinders of 6-, 7- connecting plates, 8-
Inclined block cover, water pipe in 9-, 10- enter water swivel, 11- exciter shafts, 12- feeding mouths, the adapter of 13- rubber, 14- suspension ring, 15- shaft couplings
Device, 16- blimps, 17- motor, 18- electric machine supports, cylinder under 19-, 20- discharging openings, 21- left avertence blocks, 22- right avertence blocks, 23-
Isolation spring, 24- bases.
Embodiment
In order to deepen to understanding of the present utility model, the utility model is made below in conjunction with drawings and examples further
It is described in detail, the embodiment is only used for explaining the utility model, and the scope of protection of the utility model is not formed and limited.
As shown in figure 1, material is continuously added to by feeding mouth 12, upper cylinder 6, lower cylinder 19 and each shaft screen are passed through in vibration processes
Mesh screen point, finished product is continuously discharged by discharging opening 20, and in the course of work, mill Jie's packing factor of upper and lower cylinder is 0.65, and mill Jie is
Abrasion-proof steel ball, wolfram steel ball, mill Jie's diameter are set depending on grinding charge material granularity, may generally be 3~30mm, it is higher that it grinds efficiency；Shake
For the vibration frequency of dynamic grinding machine in 750~3000 times/min, its amplitude is 2~30mm；Vibration frequency and the strong, size of amplitude of shaking,
The crushing effect being all situated between to mill has a great impact.
The outer wall of upper lower shell is formed with annular water flowing layer, and cooling water enters upper cylinder 6 through water pump to water swivel 10 is entered, through reclaimed water
Pipe 9 flows into lower cylinder 19, then flows into tank through delivery port, realizes water circulation, and in cyclic process, mill can be situated between by water produces conduction extremely
The heat of upper lower shell is taken away in time, cooling is realized, to ensure the grinding quality of material.
Motor 17 imparts power to exciter shaft 11 on support 1 by shaft coupling 15 in Fig. 1, and vibrator is using sharp
Plastid work in caused vibratory drive when the inclined block to shake on device axle rotates, mill tube makes built with medium and powder, vibration
The mills such as the steel ball in mill tube be situated between collision is produced to material, impact, shearing, extruding and rubbing with the hands are ground, reach and material crush and thin
The purpose of mill, by adjusting the angle of the inclined block of major-minor, changing and grind the measures such as the grading being situated between selection, implementation VFC, it can reach
Control the purpose of product granularity and productivity ratio.
Because the structure of the inclined block portion in left and right point is full symmetric on central plane in vibrator, therefore in embodiment
Mainly to left avertence block portion point statement, embodiment is identical therewith for right avertence block portion point；Due to symmetry, block portion point partially during motion or so
Easily realize synchronous, occasionally there is nonsynchronous situation in short-term, because exciter shaft has enough rigidity and intensity, therefore caused axial direction
The moment of couple is completely in system tolerance range.
Exciting force, amplitude, the parameter variation ranges such as frequency, oscillation intensity that shake of the present utility model of being mainly characterized by is big, passes through
Frequency converter can control effectively to its size, action time.
During vibrating mill work operating, grind that shock, the abrasive action of Jie are levigate by material, and this process is mainly due to cylinder
The repeated stock that interior mill is situated between with abrasive material causes particle to crack, and when powder deforms, new surface is just with these crackles
Based on gradually grow up, after unloading, in the presence of molecular force, they " heal " again, when ground most weak individually
When side i.e. the place of defect maximum are undergone mutation, solid will produce the destruction of macroscopic view, and mill is situated between to abrasive material in vibromill
Percussion, these microfissues is had little time " to heal " just and continuously impacted, expand microscopic checks rapidly, split
The continuous extension of line is vibrated with this, collided, impacted to carry out the fine grinding of solid material be effective so that crush.
Because vibration milling machine structure size is larger, work is continuous, and the influence of random maximum load be present, therefore caused make an uproar
Sound is larger, if not taking appropriate vibration isolation measure, dynamic loading that will be very big is transmitted to basis, ground and building is produced and is harmful to
Vibration, not only produce noise pollution environment, under serious situation, machine breakdown can be made and stopped production, and long-continued operation,
Not only the machine life-span is greatly shortened, and also peripheral equipment and building can be had an impact.
Therefore, the utility model is designed as double-mass vibrating grinding machine, only not main vibrating system, and has vibrating isolation system；Master shakes
System uses suitable vibration frequency, to meet the vibrational state needed for system work；Vibration isolation is used with nonlinear characteristic
Rubber spring, can reduce exciting source to basis exciting force, oscillation intensity to basis transmission, play effectively absorbing effect,
The dynamic loading for being transmitted to basis is reduced, greatly reduces noise caused by system；Simultaneously using the sound insulation with good soundproof effect
Cover 16 covers whole working machine, can reach further effective noise reduction, while plays raising mill efficiency, improves working environment
Purpose.
The utility model is from the medium size composition of two kinds of different densities, i.e. wolfram steel, abrasion-resistant stee, the throwing of grinding process,
In collision process, because its density of material differs about 2 times, then cause that mill in cylinder is situated between involve, relative velocity and involve, it is relative plus
Speed etc. is moved value and increased severely, and due to greatly improving for impact energy, then generates and improves mill efficiency, reduces crushing carefully
Degree, the multi-effect for reducing noise.
In Fig. 2, middle convex not doubling-up helical spring by a steel wire coil around forming, during described steel wire coil is coiled into by design
The Parameters variation such as convex helical structure, the design visible system quality of middle convex spring, exciting force is improved.Middle convex is not simultaneously
Enclose helical spring at least 4 enclose the above effective helix angle, and the effective pitch of effective helix angle be equal pitch spiral, spiral central diameter
From centre to both ends Rearrangments.
The load envnlope line of the spring is cumulative type non-linear line, and is continuous or zonal cooling, and this is advantageous to
Prevent the generation of its resonance and flutter；The big I of pitch takes different pitches between each circle, or a few circles are one group
Take into several different pitches；Pitch can ascending unidirectional array, also can be by bi-directional arrangement broad in the middle small in ends.
The pitch of middle convex not doubling-up helical spring is identical, and spiral central diameter is from centre to both ends Rearrangments.Middle convex is not
Doubling-up helical spring plays support framework, has good nonlinear characteristic and a damping and amortization, is particularly carried in system during work
Lotus increase, it is mutated or can be played when overloading and doubling-up occurs and improve bearing capacity, increase system stiffness and noise reduction, noise reduction, vibration damping
Effect.
Fig. 3 is middle convex spring adjacent turn not doubling-up schematic diagram, from the figure 3, it may be seen that convex spring is in axis direction in this
Position circle is symmetrical above and below, then middle position loop diameter is maximum and rigidity is minimum, therefore easy doubling-up, if its radius is R, as long as then controlling in theory
Spring processed is in maximum axialUnder effect, spring middle position circle and the cylindrical normal distance of neighbouring coil spring>,
The not doubling-up of whole motion process can be achieved.If known spring wire diameter, the rigidity of spring middle position circle, spring axial direction
Pitch, then rigidityIt should meet
（1）
ForThe minimum axial direction pitch of the lower middle position spring not doubling-up of effect, if setting=0.1, then have, it is defined as the maximum allowable load of spring not doubling-up.By Tu Ke get
。
Then have（2）
With formula（1）Simultaneous, it can obtain
Thus the not doubling-up of grinder system main vibration spring can be realized.
Rubber duck composite isolation spring this example selects crate tire, and experiment proves and General Purpose Rubber spring, gold
Category spring is compared, and its vibration isolating effect is considerably better, and not only vibration absorbing performance is good, noise is low, and simple in construction, good economy performance, has
Very high cost performance.
Claims (2)
- Simultaneously 1. coil spring bitubular double-mass vibrating is not ground convexity, including main vibrating system and vibrating isolation system, it is characterised in that：The main vibrating system includes being arranged on electric machine support by Frequency Converter Control（18）On motor（17）, exciter shaft （11）With motor（17）Outer shaft passes through shaft coupling（15）It is connected, the exciter shaft（11）It is arranged on support（1）On, it is described Exciter shaft（11）Support consolidation with upper cylinder（6）With lower cylinder（19）Between, plastid on composition, upper and lower mill tube is arranged on plastid On, connecting plate of the vibrator mounted in mill tube above and below upper plastid（7）Between, turn into the exciting source of whole grinding machine,The vibrating isolation system includes and main vibration spring group（3）The lower plastid of connection, the other end and isolation spring of the lower plastid （23）It is connected, the isolation spring（23）Pass through base（24）It is connected with ground；The main vibration spring group（3）Be made up of several middle convex not doubling-up helical springs, each spring by a steel wire coil around Structure forms, and steel wire is wound into convexity type helical structure, and middle convex not doubling-up helical spring at least 4 encloses the effective helix angle of the above, And the effective pitch of effective helix angle is the spiral of equal pitch, spiral central diameter is distributed in Rearrangments from the middle to both ends；Middle convex not doubling-up helical spring puts several rows in vibromill along with motor main shaft vertical direction, and edge is put down with electric machine main shaft Line direction is placed several rows, forms the uniform state of spring；The isolation spring（23）It is that isolation spring is made using composite（23）.
- 2. simultaneously coil spring bitubular double-mass vibrating is not ground convexity according to claim 1, it is characterised in that：The mill tube medium For the medium size composition of two or more different densities.
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| CN201720794193.1U CN206996733U (en) | 2017-07-03 | 2017-07-03 | Simultaneously coil spring bitubular double-mass vibrating is not ground convexity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111389522A (en) * | 2020-03-31 | 2020-07-10 | 江苏普隆磁电有限公司 | Double-cylinder vibrating mill for magnetic powder production |
-
2017
- 2017-07-03 CN CN201720794193.1U patent/CN206996733U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111389522A (en) * | 2020-03-31 | 2020-07-10 | 江苏普隆磁电有限公司 | Double-cylinder vibrating mill for magnetic powder production |
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