CN101266861A - A magneto-rheological liquid without sediment - Google Patents
A magneto-rheological liquid without sediment Download PDFInfo
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- CN101266861A CN101266861A CNA2008100692079A CN200810069207A CN101266861A CN 101266861 A CN101266861 A CN 101266861A CN A2008100692079 A CNA2008100692079 A CN A2008100692079A CN 200810069207 A CN200810069207 A CN 200810069207A CN 101266861 A CN101266861 A CN 101266861A
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Abstract
An unprecipitated magnetic current changing liquid belongs to a servo fluid of an automatic control system, comprising magnetic particle carbonyl iron powder, activating agent glycerol and stabilizer butter, volume ratio of the three is 93: 2: 5. The three substances are placed in a stirrer according to a certain proportion, and prepared the mushy un-precipitated magnetic current changing liquid after stirring. Such magnetic current changing liquid includes a quite small racing torque and has the most outstanding advantage that the unprecipitated performance can be preserved after using many times or no matter how long the liquid is laid aside.
Description
Technical field
The present invention relates to the servo working medium of automatic control system, particularly a kind of magnetic flow liquid that is used for magnetorheological device.
Background technology
Magnetic flow liquid (Magetorheological Fluid) is as a kind of novel intellectual material, with its interest that the quick response and the higher mechanical property of externally-applied magnetic field have been caused automatic control, machine components industry.The magnetorheological device of being made up of magnetic flow liquid has begun to use in servo devices such as clutch, brake, buncher, vibration absorber, flexible fixture.
At present, the research emphasis of magnetorheological device still is in the performance stage of magnetorheological mechanism, method for designing and magnetic flow liquid.Existing magnetic flow liquid is by electromagnetic material; Activating agent and carrier are formed wherein, and electromagnetic material adopts carbonyl iron dust, reduced iron powder or tri-iron tetroxide; Activating agent adopts glycerol or oleic acid; Carrier adopts machine oil.Electromagnetic material should have bigger magnetic flux density to increase its shear strength; Activating agent should have bigger absorption affinity, to separate iron powder, reduces the bump between iron powder; The effect of carrier is to prevent that iron powder from precipitating in oil.Because the proportion of iron is greater than 7, and the proportion of carrier is less than 1, and therefore, after magnetorheological device quit work, iron powder will precipitate gradually, and lost its due performance; And become the key issue that hinders magnetorheological device development, and though people have found out in the iron powder outer coatings, to make cellularly etc., effect is little.
Summary of the invention
The objective of the invention is provides a kind of magneto-rheological liquid without sediment in order to solve the shortcoming of above-mentioned magnetic flow liquid.
The present invention relates to a kind of magneto-rheological liquid without sediment, this magneto-rheological liquid without sediment is by the magnetic particle carbonyl iron dust, and activating agent glycerol and stabilizer butter are formulated, and three's volume ratio is 93: 2: 5.
When preparation, earlier carbonyl iron dust is poured in the blender, then glycerol is poured in the blender, stirred 15 minutes; Pour butter again into, stir again and formed in 15 minutes.The magnetic flow liquid of making belongs to a kind of pasty state product, and it can keep existing shape invariance when not being subjected to external force, but is not solid, as long as touch gently, just can unresistedly change over Any shape, continues the shape that keeps new then again; The magnetic flow liquid of making neither liquid, because it can not flow freely, even under the deadweight effect, also can not flow; The characteristics of most critical are to say on microcosmic, and it is under the iron powder action of gravity of larger specific gravity, and iron powder can slowly down not precipitate in carrier, and the energy holding position is constant on microcosmic.If from front statement, it can be regarded as a kind solid, when no active force or active force were very little, it can stablize original shape invariance, shows the characteristic of solid.But when outside after load increases gradually by zero and reaches critical value, this material begins distortion, but its transition resistance is very little.
The present invention is a kind of magneto-rheological liquid without sediment; this magneto-rheological liquid without sediment can be used for the servo working medium of automation field; be particularly useful for the working media of magnetorheological device,, all have the never performance of precipitation no matter how long shelve or use the back how long to shut down.
When Control current increases gradually, when magnetic field intensity strengthened gradually, ferrous magnetic material began link, and the shear strength of magnetic flow liquid is ratio and increases, and shows the transmission torque and the proportional premium properties of electric current of device.
Description of drawings
Fig. 1 is after existing magnetic flow liquid is shelved for a long time, the state of precipitation occurs.
Fig. 2 for this magnetic flow liquid when magnetic field intensity is zero, the state of magnetic particle lack of alignment.
Fig. 3 is for to add under the influence of magnetic field, and magnetic particle is along the state of magnetic line of force catenation.
Among the figure: 1, driven output overcoat; 2, the carbonyl magnetic particle; 3, the glycerol particle; 4, butter; 5, initiatively overlap in the input.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment:
Fig. 1 is for after having magnetic flow liquid device shutdown certain hour now; because the proportion of carbonyl magnetic particle 2 is very big; and glycerol 3 proportions such as grade that account for larger proportion are very little; therefore, precipitation can occur, carbonyl magnetic particle 2 is sunk because of gravity; and lost the performance of magnetic flow liquid; therefore, though magnetorheological device has been studied successfully decades, do not see actual employing all the time.
Fig. 2 shows, after every carbonyl magnetic particle 2 is stained with butter 4, it may adhere on the activating agent glycerol 3 on the carbonyl magnetic particle 2 randomly, also may adhere on the inwall of driven output overcoat 1, also may adhere on the inwall of cover 5 in the initiatively input, after adhering to certain position, because particle adhesion area specific volume is relatively large, its absorption affinity is usually greater than the gravity that falls under the particle, and presents the random distribution state.
Work as coil electricity, when the magnetic line of force vertically passed through initiatively to import the gap of 1 in interior cover 5 and driven output overcoat, carbonyl magnetic particle 2 was arranged in chain along magnetic line of force direction, as shown in Figure 3 automatically under the action of a magnetic field.And the magnetic line of force has the trend of shrinking along its length, and promptly the magnetic line of force will shorten towards the shortest direction.After the magnetic line of force forms, when overlapping 5 rotations, drive driven output overcoat 1 by the magnetic line of force and rotate as initiatively input is interior.
Through test, transmit density for increase power as far as possible, the volume of iron-based magnetic particle should reach more than 90% of interstitial volume.The recipe ratio of carbonyl magnetic particle 2, glycerol 3, butter 4 is 93: 2: 5.The carbonyl magnetic particle 2 of generation magnetic attraction can make output torque too little very little; Otherwise,, can increase no-load power if too many; Activating agent glycerol 3 is protection iron powder surfaces, as very little, occurs collision easily, influences the life-span of magnetic flow liquid, as too much, can reduce carry-over moment.Butter 4 is the even distributions of stablizing carbonyl iron dust, if very little, does not reach even distribution, can reduce output torque too much.
Claims (3)
1, a kind of magneto-rheological liquid without sediment is made up of magnetic particle, activating agent and stabilizer
It is characterized in that: three's volume ratio is 93: 2: 5, and wherein, stabilizer adopts butter formulated.
2, magneto-rheological liquid without sediment according to claim 1 is characterized in that: wherein magnetic particle is carbonyl iron dust, reduced iron powder or tri-iron tetroxide powder; Activating agent is glycerol or oleic acid.
3, according to claim 1,2 described magneto-rheological liquid without sediment, it is characterized in that this magneto-rheological liquid without sediment prepares by following method: at first 93 parts of carbonyl iron dusts and glycerol are poured in the blender for 2 parts, stir after 15 minutes, put into 5 parts in butter again, stirred again 15 minutes, and can obtain the magneto-rheological liquid without sediment of pasty state at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100692079A CN101266861A (en) | 2008-01-04 | 2008-01-04 | A magneto-rheological liquid without sediment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100692079A CN101266861A (en) | 2008-01-04 | 2008-01-04 | A magneto-rheological liquid without sediment |
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| CN101266861A true CN101266861A (en) | 2008-09-17 |
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| CNA2008100692079A Pending CN101266861A (en) | 2008-01-04 | 2008-01-04 | A magneto-rheological liquid without sediment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581343B (en) * | 2009-06-18 | 2011-12-07 | 重庆大学 | Magnetic adhesive stepless variable speed device |
| CN101581345B (en) * | 2009-06-18 | 2011-12-07 | 重庆大学 | Magnetic adhesive brake |
| CN101691518B (en) * | 2009-08-27 | 2012-10-03 | 同济大学 | Magnetorheological fluid using high molecular microgel as anti-sedimentation agent and preparation method thereof |
| CN105598459A (en) * | 2016-01-25 | 2016-05-25 | 广东工业大学 | Method for preparing magnetorheological fluid based on iron-based alloy micro-wire |
-
2008
- 2008-01-04 CN CNA2008100692079A patent/CN101266861A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581343B (en) * | 2009-06-18 | 2011-12-07 | 重庆大学 | Magnetic adhesive stepless variable speed device |
| CN101581345B (en) * | 2009-06-18 | 2011-12-07 | 重庆大学 | Magnetic adhesive brake |
| CN101691518B (en) * | 2009-08-27 | 2012-10-03 | 同济大学 | Magnetorheological fluid using high molecular microgel as anti-sedimentation agent and preparation method thereof |
| CN105598459A (en) * | 2016-01-25 | 2016-05-25 | 广东工业大学 | Method for preparing magnetorheological fluid based on iron-based alloy micro-wire |
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Open date: 20080917 |