CN107138239A - Simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating - Google Patents

Simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating Download PDF

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Publication number
CN107138239A
CN107138239A CN201710533871.3A CN201710533871A CN107138239A CN 107138239 A CN107138239 A CN 107138239A CN 201710533871 A CN201710533871 A CN 201710533871A CN 107138239 A CN107138239 A CN 107138239A
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spring
vibrating
plastid
isolation
mill
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杨小兰
刘极峰
陆云韬
胡廷杰
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Nanjing Institute of Technology
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Nanjing Institute of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/14Mills in which the charge to be ground is turned over by movements of the container other than by rotating, e.g. by swinging, vibrating, tilting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18Details
    • B02C17/24Driving mechanisms

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The present invention is that simultaneously coil spring is not ground a kind of convexity with hybrid density medium bitubular double-mass vibrating, 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 the connecting plate of mill tube above and below upper plastid, exciting source as 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 is formed by a steel wire coil around structure.There is ultramicro powder refinement, de-agglomerated, powder product to be distributed that band narrows, energy consumption is low, mill efficiency is high, capacity usage ratio is high and effective accumulation of energy, energy-conservation, steady running, the features such as noise, vibration isolating effect are good is significantly reduced by the present invention.

Description

Simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating
Technical field
The present invention relates to milling equipment prepared by a kind of vibration of superfine powder, be it is a kind of have middle convex not simultaneously coil spring, Medium is the bitubular double-mass vibrating mill that hybrid density is matched, and belongs 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, with the advantage, existing vibromill branch such as mechanical mass activity is big, purification is convenient, cost is low, simple in construction, efficiency is high Support spring and typically use 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, shows between the vibration plastid and base that are made up of cylinder and vibrator, is to pass through Spiral compression spring is connected, the vibration that vibration plastid is produced, and ground can be directly acted on by spring pedestal, is 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 is designed, 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 Medium, the mill of grinding charge material formation of system in itself are situated between and flowed, and constantly throw, fall in motion process, and actually one Nonlinear change can also occur wherein for the process of individual complicated mass change, damping, and the bias of the inclined block formation of vibrating motor swashs Power of shaking is change with the change of corner non-linear, and vibration grinding system is actually a typical nonlinear system, is 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 is generally used is linear line, to wait stiffness helix Spring, does not account for the actual condition of mission nonlinear, such as jigging conveyer, vibrating scalper, vibrating mill, due to motion shape The system load moment is all in change under state, therefore the stiffness helix spring such as uses, though there is simple in construction, low cost and other advantages, so deposits Noise is big, power consumption is high, efficiency is low, the maintenance frequency is high, equipment life low problem.
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, and with 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 is determined;The height or length of spring will be determined according to deformation required after stand under load.
Normal linear spring can not realize variation rigidity, then can not realize the vibration coupling with 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, to reach the purpose of efficient energy-saving, be one be worth discussion the problem of.
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 short life, repair the problems such as frequency is high, cost is high.
In summary, while overcoming the new grinding machine with efficient energy-saving of above mentioned problem to be not yet suggested so far.
The content of the invention
The present invention provides a kind of middle convex, and simultaneously coil spring, hybrid density medium bitubular double-mass vibrating are not ground, with double matter Body technique feature, main vibration spring is middle convex not simultaneously coil spring, and isolation spring is rubber duck complex spring, master-isolation spring It is variation rigidity;It is to improve impact of the mill Jie's ball in relative motion, extruding, shearing, the energy of collision in cylinder, implementation mixes close Medium size composition optimal design-aside is spent, it is small etc. with obvious efficiency high, noise compared with existing widely used common double tube mill Feature, it is intended to effectively solve existing vibromill all the time, pendent noise is big, the low technical bottleneck problem of efficiency.
The new bitubular double-mass vibrating mill of the present invention takes following technology to realize:
The present invention is that simultaneously coil spring and hybrid density medium bitubular double-mass vibrating are not ground a kind of convexity, including main vibrating system and every Vibrating system,
Main vibrating system includes the motor being arranged on electric machine support by Frequency Converter Control, and exciter shaft leads to motor outer shaft Cross shaft coupling to be connected, exciter shaft is arranged on support, between the support consolidation and upper cylinder and lower cylinder of exciter shaft, on composition Plastid, up and down mill tube be arranged on plastid, vibrator is above and below the upper plastid between the connecting plate of mill tube, as whole mill The exciting source of 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, vibration isolation bullet 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 is formed by a steel wire coil around structure, 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 spiral shell The effective pitch of rotation is the spiral of equal pitch, and spiral central diameter is distributed in Rearrangments from the middle to both ends.
Further improvement of the present invention is:Middle convex not doubling-up helical spring hangs down in vibromill along with motor main shaft Nogata is placed several rows along with electric machine main shaft parallel direction to several rows are put, constitutes the uniform state of spring.
Further improvement of the present invention is:Isolation spring is to use composite, and such as rubber duck composite is made Isolation spring.
Further improvement of the present invention is:The mill is situated between for the medium size composition of two or more different densities.
The bitubular of the present invention also two be exactly mill tube above and below double mill tubes mainly include with double mass structure, upper plastid, lower plastid, The parts such as motor, vibrator, main vibration spring, shock-absorbing spring, base;Wherein mill tube is consolidated on plastid;Upper plastid It is connected between lower plastid by the spring guide pillar in main vibration spring group and upper and lower plastid;Lower plastid passes through shock-absorbing spring branch Hold on base;Vibrator is between the connecting plate of mill tube above and below upper plastid, the exciting source as whole grinding machine.During work, 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 in mill tube Impact grinding ability of the medium to material;The amplitude and acceleration of lower plastid are smaller, then can greatly reduce biography by isolation spring Dynamic loading to 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 mill, which is situated between, in mill tube produces mutually motion, So, in cylinder and stick 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, can be obvious by two groups of springs of main vibration spring and isolation spring Oscillation intensity and noise that reduction vibromill main body is produced to ground, and the effect of energy-conservation has been reached, 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 grinding machine of the present invention is made up of some middle convex not doubling-up helical springs, wherein each spring Formed by a steel wire coil around structure, described steel wire is wound into middle convex helical structure, middle convex spring according to design data The Parameters variation such as design visible system quality, exciting force be designed, it is more than the middle circle of convex not doubling-up helical spring at least 4 Effective helix angle, and effective helix angle effective pitch be equal pitch spiral, spiral central diameter is general in symmetrical from centre to two ends Successively decrease distribution.
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 conducive to preventing the generation of 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, it is considered to the condition of not doubling-up, can be achieved the not doubling-up of grinder system main vibration spring, can return the noise that spring doubling-up is produced Zero.
Due to the central diameter change of the helical structure of convex not doubling-up helical spring in composition, there is the present invention obvious non- Linear and required variation rigidity feature, i.e., the system stiffness that spring of the present invention is constituted has the variation rigidity increased and decreased with loads increasing or decreasing Feature, makes the effective accumulation of energy of system, energy-conservation, steady running, significantly reduces the purpose of 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 puts multiple rows of with electric machine main shaft vertical direction, places some rows along with electric machine main shaft parallel direction, constitutes the uniform state of spring, So that vibromill preferably works.
Isolation spring can be made of rubber duck composite in the present invention, lower plastid by isolation spring and base with Ground is connected, because isolation spring has hard nonlinear characteristic, and its rigidity has the characteristics of changing with load change, can obtain Preferable noise reduction, the purpose of firm banking is mainly the movement for preventing 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 conformation, volume with comminuting matter, the acceleration of mill tube vibration to complete to impact typically up to 6g-12g Small, lightweight, properties of powder performace concentration, process simplification, the advantages of simple to operate, easy to maintenance, liner plate Medium Replacement is easy, 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 is used, size can be entered according to different material by experiment or numerical simulation Row is compared, to determine optimum gradation, and 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 Jie of appropriate two or more different densities of selection Matter is matched, such as wolfram steel, abrasion-resistant stee, in the throwing of grinding process, collision process, because its density of material differs about 2 times, is then led Cause that mill in cylinder is situated between involve, relative velocity and involve, the motion value such as relative acceleration increases severely, and necessarily causes its impact energy That measures greatly improves, as the necessary condition for improving mill efficiency.
The realization of hybrid density media technology main points, can reach generation impact, shearing, extruding etc. in grinding operation a variety of The Practical Project effect of the combining ability effect of power, some work barrier for overcoming vibrating machine solve vibrating machine special It is some key technologies of vibromill or the bottleneck problem of restriction development, such as solves ultramicro powder in vibromill and do not refine, easily roll into a ball Gather, powder product distribution band is big compared with wide and energy consumption, mill efficiency is low, the low problem of capacity usage ratio, and then realize material Ultra-fine or ultramicro grinding, reduction energy consumption, raising efficiency, with significant engineering effort, economic and social benefit, due to high density Medium is using the financial cost for causing grinding machine exciting power slightly to be lifted, compared with the economic benefit that the present invention is produced, for chasing after The target of high-quality powder is asked to can be ignored substantially.
The beneficial effects of the invention are as follows:Vibrating mill of the present invention is compared with common elemental body grinding machine, due to master Vibrating isolation system, on the one hand can bear bigger exciting force, on the other hand can effectively reduce vibration effect of the vibrating mill to ground, Reach good energy-saving effect;The main vibration spring and the rigidity of isolation spring can be with the changes of grinder system maximum load 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, and main vibration spring exists Not doubling-up under possible maximum load so that system noise is significantly reduced and dynamic stability is greatly increased, overall efficiency is obvious Lifting;In the case of hybrid density medium size composition optimal design-aside, compared with existing grinder system, from this angle of Media density Examination, it is even more apparent to improve the advantages such as high, the reduction energy consumption of system effectiveness.
In summary, it is positive, obvious and unique using the effect of the present invention, it has ultramicro powder refinement, solution group Band narrows, energy consumption is low, mill efficiency is high, capacity usage ratio is high and effective accumulation of energy, energy-conservation, stable fortune for poly-, powder product distribution Turn, significantly reduce the features such as noise, vibration isolating effect are good.The present invention above-mentioned technology, effectively solve existing vibromill always with Come that pendent energy consumption is big, in the low technical bottleneck problem of efficiency, the step crossed over will be realized.
Brief description of the drawings
Fig. 1 is vibromill structural representation of the present invention.
Fig. 2 is convex not doubling-up helical spring structure schematic diagram in the present invention.
Fig. 3 is convex spring adjacent turn not doubling-up schematic diagram in the present invention.
Wherein:Plastid under 1- supports, 2-, 3- main vibration spring groups, 4- connecting tubes, 5- flanges, the upper cylinders of 6-, 7- connecting plates, 8- Water pipe in inclined block cover, 9-, 10- enters water swivel, 11- exciter shafts, 12- feeding mouths, the adapter of 13- rubber, 14- suspension ring, 15- shaft couplings Cylinder under device, 16- blimps, 17- motor, 18- electric machine supports, 19-, 20- discharging openings, 21- left avertence blocks, 22- right avertence blocks, 23- Isolation spring, 24- bases.
Embodiment
In order to deepen the understanding of the present invention, present invention work is further retouched in detail below in conjunction with drawings and examples State, the embodiment is only used for explaining the present invention, protection scope of the present invention is not constituted 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 cylinder is 0.65 up and down, 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 The vibration frequency of dynamic grinding machine is in 750~3000 times/min, and its amplitude is 2~30mm;Vibration frequency and the strong, size of amplitude of shaking, All have a great impact to the crushing effect that mill is situated between.
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, in cyclic process, and 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 the inclined block shaken on device axle vibratory drive produced when rotating, mill tube makes built with medium and powder, vibration The mill such as steel ball in mill tube, which is situated between, to be produced collision, impact, shearing, extruding and rubbing with the hands to material and grinds, and reaches and material is carried out to crush and thin The purpose of mill, by adjusting the angle of the inclined block of major-minor, changing and grind the level being situated between with selecting, implementing the measures such as VFC, 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 Main that left avertence block portion point is stated, 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 the axial direction produced The moment of couple is completely in system tolerance range.
The present invention's is mainly characterized by exciting force, amplitude, the parameter variation ranges such as frequency, oscillation intensity that shake greatly, passes through frequency conversion Device can control effectively to its size, action time.
During vibrating mill work operating, the shock being situated between is ground, abrasive action is levigate by material, 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 most weak ground individually I.e. when defect maximum place in side's is 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 down to crushing, therefore the fine grinding being vibrated, collided with this, impacted to carry out solid material is effective.
Because vibration milling machine structure size is larger, work it is continuous, and there is the influence of random maxima load, therefore making an uproar of producing Sound is larger, if not taking appropriate vibration isolation measure, very big dynamic loading will be transmitted to basis, produces ground and building harmful Vibration, not only produce noise pollution environment, it is serious in the case of, machine breakdown can be made and stopped production, and long-continued operation, Not only the machine life-span greatly shortens, and can also produce influence to peripheral equipment and building.
Therefore, the present invention is designed as double-mass vibrating grinding machine, only not main vibrating system, and has vibrating isolation system;Main vibrating system Using suitable vibration frequency, to meet the vibrational state needed for system work;Vibration isolation uses the rubber with nonlinear characteristic Spring, can reduce exciting source to basic exciting force, oscillation intensity to the transmission on basis, play effectively absorbing effect, reduction The dynamic loading on basis is transmitted to, the noise that system is produced is greatly reduced;Simultaneously using the blimp 16 with good soundproof effect Whole working machine is covered, effectively noise reduction is can reach further, while playing raising mill efficiency, improves the mesh of working environment 's.
The present invention is from the medium size composition of two kinds of different densities, i.e. wolfram steel, abrasion-resistant stee, in the throwing of grinding process, collides During, because its density of material differs about 2 times, then cause that mill in cylinder is situated between involve, relative velocity and involve, relative acceleration Deng motion value increase severely, due to greatly improving for impact energy, then generate raising mill efficiency, reduction smashing fineness, Reduce the multi-effect of noise.
In Fig. 2, middle convex not doubling-up helical spring by a steel wire coil around constituting, during described steel wire coil is coiled into by design Convex helical structure, the Parameters variation such as design visible system quality, the exciting force of middle convex spring is improved.Middle convex is not simultaneously The effective helix angle that helical spring at least 4 encloses the above is enclosed, and the effective pitch of effective helix angle is the spiral of equal pitch, spiral central diameter From centre to two ends Rearrangments.
The load envnlope line of the spring is cumulative type non-linear line, and is continuous or zonal cooling, and this is conducive to Prevent the generation of its resonance and flutter;The big I of pitch is that different pitches are taken between each is enclosed, 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 two ends Rearrangments.Middle convex is not Doubling-up helical spring plays support framework, with good nonlinear characteristic and damping and amortization, is particularly carried during work in system Lotus increases, is mutated or can played when overloading and occurring doubling-up raising 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 easily 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, that is, 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 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, can be obtained
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 is proved 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, and good economy performance has Very high cost performance.

Claims (4)

  1. Simultaneously 1. coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating, including main vibrating system and vibrating isolation system, its It is characterised by:
    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, up and down mill tube be arranged on plastid On, connecting plate of the vibrator mounted in mill tube above and below upper plastid(7)Between, the exciting source as 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 is formed, 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.
  2. 2. simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating according to claim 1, its feature exists In:Middle convex not doubling-up helical spring puts several rows in vibromill along with motor main shaft vertical direction, is put down along with electric machine main shaft Line direction is placed several rows, constitutes the uniform state of spring.
  3. 3. simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating according to claim 1, its feature exists In:The isolation spring(23)It is that isolation spring is made using composite(23).
  4. 4. simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating according to claim 1, its feature exists In:The mill is situated between for the medium size composition of two or more different densities.
CN201710533871.3A 2017-07-03 2017-07-03 Simultaneously coil spring is not ground convexity with hybrid density medium bitubular double-mass vibrating Pending CN107138239A (en)

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