CN1224247A - Piezoelectric actuator - Google Patents
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- CN1224247A CN1224247A CN98119115.0A CN98119115A CN1224247A CN 1224247 A CN1224247 A CN 1224247A CN 98119115 A CN98119115 A CN 98119115A CN 1224247 A CN1224247 A CN 1224247A
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- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 2
- 229910002113 barium titanate Inorganic materials 0.000 description 2
- WAKZZMMCDILMEF-UHFFFAOYSA-H barium(2+);diphosphate Chemical compound [Ba+2].[Ba+2].[Ba+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O WAKZZMMCDILMEF-UHFFFAOYSA-H 0.000 description 2
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Abstract
Disclosed is a piezoelectric actuator for a textile machine having no problem of depolarization, which comprises a plurality of piezoelectric ceramic layers stacked, in which charging of electric charges by application of voltage to one of said plurality of piezoelectric ceramic layers and discharging thereof are alternately repeated by switching operation according to a switching element.
Description
The present invention relates to piezoelectric driver, relate to the piezoelectric driver that does not produce the depolarising problem of textile machine more precisely, particularly can be used for the piezoelectric driver in the warp thread controlling organization of the knitting needle driving mechanism (the knitting needle selecting device of knitting machine) of knitting machine or loom.
When electric field put on piezoelectric ceramic, cation was attracted along direction of an electric field, and anion is attracted along opposite direction, so that produced the crystal strain, caused piezoelectric ceramic deformation.
As shown in Figure 9, to being equipped with piezoelectric patches 10 making alives of electrode 11 and polarize (X), change its length with regard to causing strain (Z) along its length.
But in fact, this deformation is so little, so that the piezoelectric patches that has amplified deformation with the bimorph operation principle has been used as various piezoelectric drivers so far.
The operation principle of conventional bimorph piezoelectric driver is as follows.That is shown in Fig. 8 (A) and 8 (B), bimorph piezoelectric driver 12 comprises two thin stacked piezoelectric ceramic pieces 10 usually, be inserted with the partition of making by sheet metal and so on that does not play piezoelectric activity 13 therebetween, so that as bimetallic, when a piezoelectric ceramic piece 10 expands, another contraction.This expansion and convergent force make the sheet metal bending of partition 13, thereby cause crooked deformation generally.This displacement and power are used in the piezoelectric driver 12.
Fig. 8 (A) and 8 (B) show the operation principle of piezoelectric driver, the former shows the principle of tandem type bimorph piezoelectric driver, polarised direction X wherein is symmetrical with respect to partition 13, the latter shows the principle of parallel connection type bimorph piezoelectric driver, and polarised direction X wherein is aligned to along identical direction.All be to attempt as shown in the figure by means of two piezoelectric ceramic pieces 10 along the expansion of direction opposite each other and convergent force and obtain crooked deformation under two kinds of situations.That is when a piezoelectric ceramic piece 10 expanded, another shrank, thereby by partition 13 generation crooked deformation generally.
But in this bimorph piezoelectric driver 12, exist the depolarising problem.That is in these bimorph drivers, the system of employing is that the displacement that wherein produces crooked deformation in piezoelectric ceramic piece 10 relies on and applies voltage (electric field) Y along the thickness opposite directions of sheet and obtain.Must be added on a piezoelectric ceramic piece 10 along voltage Y, so that produce depolarising according to level and the application time of voltage Y in contrast to polarization (direction) directions X.When one piezoelectric property in two piezoelectric ceramic pieces is lowered owing to unpolarizing, just can not get desirable displacement.Therefore be difficult to cause the inevitable shutdown of machine as piezoelectric driver.It is generally acknowledged,, just begin to take place inevitably depolarising when electric field is about three/for the moment of anti-electric field (making the electric field of polarization complete obiteration).
Particularly when applying DC (direct current) voltage continuously, be easier to take place depolarising.Therefore also study with special circuit and carry out AC (interchange) driving so that alternately apply the electric field opposite with polarised direction.
But except applying the caused charge charging of electric field, also occur the problem of its electric discharge device aspect in order bending displacement to occur as piezoelectric driver this moment.
As mentioned above, exactly be in the piezoelectric driver of described textile machine after a while, particularly in the warp thread controlling organization of the knitting needle driving mechanism of knitting machine or loom, when for example knitting needle is bent selected and displacement time of pressure when quite growing, it is very serious that unpolarized problem just becomes.For example, make the displacement of baffle plate probe owing to applying dc voltage.When this displacement turned back to original state after maximum about 5 seconds, the recovery of polarization was rapidly.But the piezoelectric driver of textile machine tends to keep displacement.
In for example Japanese uncensored patent disclosure No.60-249877,60-211176,61-15383,55-104149 and 54-133124, piezoelectric driver has been described.
Therefore, an object of the present invention is to provide a kind of technology that can solve these problems of prior art.
Another object of the present invention is that a kind of piezoelectric driver that is used for textile machine is provided particularly, the piezoelectric driver of the warp thread controlling organization of particularly a kind of knitting needle driving mechanism that can be used in knitting machine or loom.
From the whole description of this specification, above-mentioned purpose and features of novelty with other of the present invention will become obvious.
The present invention provides a kind of piezoelectric driver that can not be depolarized for textile machine, described driver comprises a plurality of piezoceramics layers that pile up, wherein carry out charge charging, and alternately repeat its discharge by means of the switching manipulation of switch element by means of one in described a plurality of piezoceramics layers applies voltage.
Fig. 1 (A)-1 (D) schematically shows the major part that embodies piezoelectric driver of the present invention respectively and its piezoelectric working has been described;
Fig. 2 (A) has schematically illustrated the work that embodies described piezoelectric driver of the present invention, and Fig. 2 (B) profile has illustrated the major part that embodies another piezoelectric driver of the present invention;
Fig. 3 profile has illustrated the knitting needle driving mechanism of knitting machine, has wherein adopted and has embodied piezoelectric driver of the present invention;
Fig. 4 (A) and 4 (B) have illustrated schematically that respectively the knitting needle of the piezoelectric driver in the knitting needle driving mechanism of knitting machine drives operation;
Fig. 5 has schematically illustrated a kind of knitting machine;
Fig. 6 (A) plane graph shows the warp thread controlling organization of loom, wherein adopted and embodied piezoelectric driver of the present invention, and Fig. 6 (B) is the profile of the warp thread controlling organization shown in Fig. 5 (A);
Fig. 7 (A) and 7 (B) have schematically illustrated the control operation of the piezoelectric driver in the warp thread controlling organization of loom respectively;
Fig. 8 (A) and 8 (B) schematically show conventional bimorph piezoelectric element respectively; And
Fig. 9 schematically shows a kind of conventional piezoelectric element.
Following embodiment with reference to the accompanying drawings to describe the present invention.
Fig. 1 (A)-1 (D) schematically shows the major part that embodies piezoelectric driver of the present invention respectively and its piezoelectric working has been described.
Fig. 2 (A) has schematically illustrated the work that embodies described piezoelectric driver of the present invention, and Fig. 2 (B) profile (having omitted hatching) shows the major part that embodies another piezoelectric driver of the present invention.
Fig. 3 profile has illustrated the knitting needle driving mechanism of knitting machine, has wherein adopted and has embodied piezoelectric driver of the present invention.
Fig. 4 (A) and 4 (B) have illustrated schematically that respectively the knitting needle of the piezoelectric driver in the knitting needle driving mechanism of knitting machine drives operation.
Fig. 5 has schematically illustrated a kind of knitting machine.
Fig. 6 (A) plane graph shows the warp thread controlling organization of loom, wherein adopted and embodied piezoelectric driver of the present invention, and Fig. 6 (B) is the profile of the warp thread controlling organization shown in Fig. 5 (A).
Fig. 7 (A) and 7 (B) have schematically illustrated the control operation of the piezoelectric driver in the warp thread controlling organization of loom respectively.
Shown in Fig. 1 (A), two piezoceramics layers 10 pile up each other, do not allow to insert the partition of being made by sheet metal and so on that does not play piezoelectric activity therebetween.The switch S of handling upper strata piezoelectric ceramic 10 is provided
1With the switch S of handling laminated electroceramics 10
2, and be electrically connected on DC power supply (V).
Shown in Fig. 1 (A), switch S
1Be connected in a side, and voltage Y puts on upper strata piezoelectric ceramic 10.Owing to making electric charge, voltage application on described upper strata piezoelectric ceramic 10, charges.Switch S
2Be diverted the d side, make voltage not put on laminated electroceramics 10, thereby make lower floor keep the state that remains untouched.In upper strata piezoelectric ceramic 10, owing to applying of voltage Y produces strain Z, and the laminated electroceramics 10 that does not apply voltage keeps the state that remains untouched.
Equally, shown in Fig. 1 (C), switch S
2Be connected in the c side, make voltage Y put on the laminated electroceramics.Owing to making electric charge, voltage application on described laminated electroceramics 10, charges.In laminated electroceramics 10, owing to applying of voltage Y produces strain Z.Switch S
1Be diverted the b side, make voltage not put on upper strata piezoelectric ceramic 10, thereby make the upper strata keep the state that remains untouched.
As mentioned above owing to apply voltage on upper strata piezoelectric ceramic 10 electric charge of charging, by means of with switch S
1Turn to the b side and discharged.Repeat to apply voltage and make charge charging and discharge.
Owing to apply voltage on laminated electroceramics 10 electric charge of charging, by means of with switch S
2Turn to the d side also to be discharged.Repeat to apply voltage and make charge charging and discharge.
Shown in Fig. 1 (B) and 1 (D), these piezoceramics layers 10 are bent.
Shown in Fig. 2 (A),, thereby can promote (displacement) piezoelectric driver up and down to guarantee the bimorph action owing to above-mentioned switching manipulation makes alternately recharge and discharge of electric charge on the upper and lower piezoelectric ceramic 10.
In Fig. 2 (A), X represents polarization (polarised direction).
In order to utilize its piezoelectric property, require piezoelectric ceramic polarization (X).Under polarized state, they expand under positive electric field and shrink under negative electric field.
Above-mentioned voltage (dc voltage) Y can be under voltage that piezoelectric ceramic can be polarized or higher voltage, and use in the not forbidden scope at the anti-electric field (making the electric field of polarization complete obiteration) of piezoelectric ceramic and to apply.
Appropriate electric field by means of for example apply the stipulated time in having the silicone oil of appropriate temperature carries out above-mentioned polarization.Higher temperature allows to polarize in lower electric field.But too high temperature can reduce resistivity, makes electric current to occur, causes dielectric breakdown.Polarization method comprises the electric field cooling means, and wherein after being heated to the temperature that is equal to or higher than its Curie point, piezoelectric ceramic is cooled off when applying electric field gradually at every turn.
As mentioned above, the charging of electric charge and discharge alternately repeat on the upper and lower piezoceramics layer 10, make viewed depolarising problem in the conventional piezoelectric driver can not occur because direction of depolarization X is consistent with voltage direction Y shown in Fig. 2 (A).Owing to depolarising do not occur, also can prevent the inevitable shutdown of machine so can guarantee desirable displacement.
Piezoelectric driver of the present invention can be by means of bending realizes displacement need not be as the prior art piezoelectric driver along sheet thickness opposite directions apply voltage so that one expand and another shrinks, and need not consider can not insert the partition of piezoelectric activity.
Like this, as shown in the figure,, also might obtain stroke (displacement) S, on opposite side, form short circuit, alternately repeat to guarantee the bimorph stroke even utilize the system that applies voltage to one of upper strata and lower floor's piezoceramics layer.By means of the stroke that is twice in total displacement up and down (displacement) shown in Fig. 2 (A), piezoelectric driver of the present invention can be used as the piezoelectric driver in the textile machine such as the warp thread controlling organization of the knitting needle driving mechanism of knitting machine or loom fully.
Even for a long time dc voltage is put on continuously the piezoelectric driver of textile machine, unpolarized problem can not occur, and piezoelectric driver do not keep displacement yet, this just can work reposefully.
Various piezoelectric substances (crystal) can be used as the piezoelectric ceramic of forming piezoceramics layer 10 used in the piezoelectric driver of the present invention.Its object lesson comprises the lead zirconates (PbZrO that is called PZT
3) and lead titanates (PbTiO
3) solid solution, lead zirconates (PbZrO
3), lead titanates (PbTiO
3), barium titanate (BaTiO
3) and barium phosphate.Additive such as Nb, Co and Mn can join among the piezoelectric substance.Piezoelectric substance can be the complex compound of itself and polymer.
For example, upper strata piezoelectric ceramic 10 can constitute by 7 layers, and laminated electroceramics 10 also can constitute by 7 layers, thereby is made up of 14 piezoelectric drivers that piezoceramics layer constitutes altogether.
For example, in piezoelectric driver of the present invention, shown in Fig. 2 (B), when the thickness of upper strata piezoelectric ceramic 10 was begun to change by the thickness of laminated electroceramics 10, displacement was preferably further amplified.For example, the gross thickness of upper strata piezoelectric ceramic 10 is the biggest like the gross thickness of laminated electroceramics.That is the gross thickness that the gross thickness of laminated electroceramics 10 cans be compared to the upper strata piezoelectric ceramic most is littler.
In each upper strata piezoelectric ceramic and laminated electroceramics, the thickness of piezoelectric ceramic can change.For example, in this case, preferably therefrom mind-set reduces thickness outward gradually.
And, the piezoelectric constant d of the piezoelectric ceramic in piezoceramics layer 10
31When therefrom mind-set increased outward continuously, displacement was preferably further amplified.
Described piezoelectric constant d has been described
31This is based on the piezoelectric constant (piezoelectric strain constant) in piezoelectric ceramic assessment and the measurement.
Though exist the fundamental formular of the various description phenomenon of piezoelectricity, but type of service d.In the form d of the material constant of determining piezoelectric ceramic, mechanical variables (strain S) and electricity variable (electric displacement D) are represented by following formula (1):
Fundamental formular
S=s
ET+dE
D=dT+ε
TE……(1)
Wherein D and E represent vector (lattice structure of supposing piezoelectric ceramic has high symmetry); T and S represent symmetric tensor; D represents piezoelectric strain constant; S
EElastic compliance during expression E=0; And ε
TDielectric constant during expression T=0.
In the coefficient matrix of vectorial D and E and symmetric tensor T and S according to these, being not equal to an independent coefficient of 0 is coefficient d
31
Assessment and method of measurement according to the so-called resonance method that piezoelectrics is processed into harmonic oscillator, be defined as ieee standard 176-1978 in the U.S., be defined as the standard EMAS-6001-6006 of electronic material TIA in Japan, and be defined as IEC standard publication 483 front pages in the world.
Piezoelectric coefficient d
31Obtain by following formula (2):
Wherein κ is the electromechanical coupling coefficient, and the length vibration of rectangular sheet is taken as κ
31, and piezoelectric coefficient d
31Unit be C/N (m/V).
The piezoelectric coefficient d of the length direction vibration of the row of determining by following formula (3)
33, be numerical value, and in the present invention, each piles up the piezoelectric coefficient d of piezoceramics layer for the overall stack lamination
31Must satisfy above-mentioned formula.
Wherein κ is the electromechanical coupling coefficient, and the vibration of the length direction of row is taken as κ
33
By means of suitably choosing component and such as the lead zirconates (PbZrO that is called PZT
3) and lead titanates (PbTiO
3) solid solution, lead zirconates (PbZrO
3), lead titanates (PbTiO
3), barium titanate (BaTiO
3) and the material of barium phosphate and so on, can adjust the piezoelectric coefficient d of each piezoceramics layer that piles up
31
Can be according to piezoelectric driver of the present invention in order to method acquisition down.
In the calcined powder of piezoelectric ceramic, add organic solvent, adhesive, plasticizer, dispersant and so on, then mix.Then, the mixture that obtains is made into the sheet embryo, strikes out suitable size.Make the conducting resinl of the interior electrode contain Ag-Pd or Pd with method for printing screen, more this embryo of requirement piled up and they are pressed into an integral body.Under the situation of pressurization,, then for example under about 1200 ℃, calcine ceramic products to obtain piling up with sheet embryo heating (being generally 500-600 ℃).After the product that cutting is piled up, insulator and external electrode are fixed thereon.Interior electrode is electrically connected by parallel connection every one deck.In addition, in order to produce the piezoelectric driver that piles up, can adopt the technology of the above-mentioned multi-layer ceramic capacitor that is called sheet embryo method.The piled products that obtains is polarized as described above, so that utilize its piezoelectric property.
Though can obtain above-mentioned piezoelectric driver by means of the sheet embryonic knob being incorporated into together, preferably use generally identical materials and without adhesive, by means of combining with being present in interior electrodes conduct glue wherein as mentioned above with adhesive.
, can improve bonding strength, omit adhesion step and reduce cost in conjunction with identical materials without adhesive.And the employing identical materials can matched coefficients of thermal expansion.
Be example below, describe the piezoelectric driver of textile machine of the present invention with the knitting needle driving mechanism of knitting machine and the warp thread controlling organization of loom.
As shown in Figure 5, in the jacquard knitting machine such as jacquard weave circular knitter or jacquard weave flat knitting machine, the jacquard weave program that knitting needle driving mechanism (knitting needle drive pressure electric autuator) is used to be stored in the memory of floppy disk and so on is converted to moving up and down of knitting needle.A plurality of knitting needle driving mechanisms 15 that control knitting needle 14 moves up and down are arranged in around the braiding tube 16, and are connected in jacquard weave controller 17.Jacquard weave program feedback from jacquard weave controller 17 realizing moving up and down of knitting needle 14, thereby carry out jacquard knitting.Though not shown, below knitting needle, be arranged with a plurality of knitting needles and drive needle jack, and knitting needle contacts with the top of needle jack with outstanding stitch.Stocking yarn 18 is fed to braiding tube 16 from shuttle 19, and makes knitting driving mechanism 15 act on knitting needle to drive needle jack realizing moving up and down of aforesaid knitting needle 14, thereby carries out the loop selection of knitting machine.Can make knitting needle driving mechanism 15 directly act on knitting needle 14.
In an embodiment of knitting needle driving mechanism 15, as shown in Figure 3, piezoelectric driver 20 is held in a plurality of platforms by 21 on support, and transverse arm 22 is connected in the end points of piezoelectric driver 20.The front end of transverse arm 22 is protruding by the opening 24 of the baffle plate 23 of support 21, and each piezoelectric driver 20 can be by lead-in wire 25 by 17 operations of jacquard weave controller.The action of transverse arm 22 makes knitting needle 14 move up and down as described above again, thereby carries out the jacquard knitting of knitting machine.
The knitting needle that pressing system under the piezoelectricity is described below drives operation.Shown in Fig. 4 (B), from jacquard weave controller 17 voltage is put on piezoelectric driver 20 (or applying positive pulse) via lead-in wire 25, this just makes piezoelectric driver 20 bendings, makes transverse arm 22 depart from (for example downward bias from), causes knitting needle to drive the pressure that does not bear transverse arm on the stitch 27 of needle jack 26.Therefore, knitting needle drives needle jack 26 maintenance upright positions.As a result, the stitch 28 that knitting needle drives the outstanding rise cam of needle jack 26 lower ends just meshes with rise cam 29, and knitting needle driving needle jack 16 and knitting needle 14 are docked to move upward with its top, causes and knitting needle 14 formation braided rings.On the other hand, shown in Fig. 4 (A),, just make piezoelectric driver 20 not crooked, so that the stitch 27 of knitting needle driving needle jack 26 is under pressure owing to do not apply voltage (or applying negative voltage).As a result, the stitch 28 that knitting needle drives the outstanding rise cam of needle jack 26 lower ends just with rise cam 29 engagements, make knitting needle 14 be failure to actuate and dock with the top that knitting needle drives needle jack 26.
According to Fig. 6 and 7 employed piezoelectric driver in the warp thread controlling organization of loom is described then.
With regard to the General Principle of loom, under tabby situation, warp thread is to be divided into two groups to form shed open by heddle (heald) and by moving up and down of heddle (heald).Make weft yarn pass through shed open with shuttle then, compress fell again.Form another combinations of warps then, then, so just make to weave to continue by weft yarn.
Piezoelectric driver is used to control heddle (heald) and controls warp thread.
Shown in Fig. 6 and 7, though transverse arm 22 is fixed in the end points that is electrically connected to the piezoelectric driver of unshowned shed open controlling organization among the figure, and piezoelectric driver is worked by means of the action of transverse arm 22, with heddle (heald) (not shown) and the warp thread of control connection in the control lever bottom.When voltage (pulse) when putting on piezoelectric driver 20, piezoelectric driver 20 is because bending and displacement, and because transverse arm 22 is connected in piezoelectric driver 20, so transverse arm 22 is also followed the displacement campaign that piezoelectric driver 20 causes owing to bending (bending motion).Be equipped with the transverse arm 22 of hook 30 (or hook holes) just to mesh with the control lever 31 that is equipped with hook or hole 310 equally.On the other hand, when not applying voltage (pulse) on the piezoelectric driver 20, transverse arm 22 position that maintenance separates with it with control lever 31 generation engagements.So the former state of engagement or retentive control bar 31 optionally takes place in transverse arm 22 with control lever 31.As mentioned above, though not shown, control lever 31 is connected in heddle (heald) in the bottom in hook or hole 310.Control lever 31 is relevant with heddle (heald) with control heddle (heald) and warp thread in operation.
When piezoelectric driver of the present invention is used to the knitting needle driving mechanism of the warp thread controlling organization of loom or knitting machine as mentioned above, preferably adopt the described form that does not hinder bending motion of the foregoing description.
Situation with the knitting needle driving mechanism 15 of knitting machine is an example, and spheroid 34 is fixed in the rear end of piezoelectric driver 20, and the rear end that is fixed with the piezoelectric driver 20 of spheroid 34 is inserted into the piezoelectric driver of support 21 and settles in the groove 36 at position 35.The bulb of spheroid 34 is made into and can settles motion in the groove 36 at position 35 at piezoelectric driver, thereby makes the rear end of piezoelectric driver 20 movable.
And, also be fixed in the front end of piezoelectric driver 20 to above-mentioned similar spheroid 34.Spheroid 34 is made into and can moves in the rear end of transverse arm 22, thereby also makes the front end of piezoelectric driver 20 movable.
And, rotary body 38 is fixed in the rear end of piezoelectric driver 20 and the place, a centre position between the front end, and two ends of rotary body 38 are rotatably installed on the rotary body arrangement position (middle rotating position) 39 of support 21, and the rear end of piezoelectric driver 20 and the motion in the centre position between the front end can not stopped owing to the rotation of rotary body 38.
According to this system and device, piezoelectric driver 20 freely moves, and its motion is not interrupted, and forms intermediate rotary shaft.Therefore has the fabulous advantage that the knitting needle actuating speed can improve and can prolong the piezoelectric driver life-span greatly.
In this respect, piezoelectric driver also similarly is applied in the warp thread controlling organization of loom.Spheroid 34 is fixed in the upper end of piezoelectric driver 20 and props up movingly and is held in the groove 36 that is produced in the support (control lever support) 21, and its lower end is connected in transverse arm 22 movingly.Centre position between piezoelectric driver 20 top and bottom is fixed in the rotary body 38 that is rotatably installed on the control lever support 21, and the top and bottom of piezoelectric driver 20 and the centre position between them, be made into and move with the bending motion of piezoelectric driver 20, make it not hinder the bending motion of piezoelectric driver 20.The advantage of the selection control operation speed of the control operation speed of control lever 31 and heddle (heald) warp thread to such an extent as to this just can be improved, and the life-span and the further advantage that reduces applied voltage that prolong piezoelectric driver 20.
Though described specific embodiment of the present invention, will be appreciated that these embodiment are used for limiting the scope of the invention, various changes and correction be can make in the present invention and its design and scope do not surmounted.
In above-mentioned each embodiment, show the use of switch as an example.But if switching function is arranged, then other device also can use, and for example, also can use the various switch elements that are made of field-effect transistor (FET) and so on.
Adopt the warp thread controlling organization of the loom of piezoelectric driver of the present invention, be mainly used in the jacquard loom, wherein the card of the jacquard weave pattern punching that proposes according to Jack's moral is used to only mention the hook corresponding to the position in each hole of card, thereby only mention the warp thread that is connected in hook by harness cord, and between the warp thread of warp thread that is raised and maintenance origin-location, form shed open.
The present invention also can be used as the piezoelectric driver rather than the above-mentioned driver of pressing system down of the elevator system in the knitting needle driving mechanism of knitting machine.
The resulting effect of the exemplary embodiments of the disclosed piezoelectric driver of the present invention of this specification is summarized as follows.
That is, according to the present invention, can make direction of depolarization always consistent with the voltage that applies (electric field) direction, cause the depolarising problem not occur, the displacement decline that depolarising causes can not appear.Therefore can guarantee desirable displacement.
The front had been said that the displacement of the element outside the bimorph cell was very little thereby had been not suitable for using.But according to the present invention, the application of piezoelectric driver in textile machine becomes possibility, and can provide because of crooked movable flexure type piezoelectric driver.
Claims (5)
1. piezoelectric driver that can not be depolarized that is used for textile machine, described driver comprises a plurality of stacked piezoceramics layers, wherein make charge charging in described a plurality of piezoceramics layers, and this charging and discharge thereof are alternately repeated by means of switching manipulation according to switch element by means of applying voltage.
2. according to the piezoelectric driver of claim 1, wherein the voltage that is applied is direct voltage.
3. according to the piezoelectric driver of claim 1, wherein only pile up a plurality of piezoceramics layers, and do not allow to insert partition betwixt.
4. according to the piezoelectric driver of claim 1, wherein said piezoelectric driver is the piezoelectric driver in the knitting needle driving mechanism of knitting machine.
5. according to the piezoelectric driver of claim 1, wherein said piezoelectric driver is the piezoelectric driver in the warp thread controlling organization of loom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98119115.0A CN1224247A (en) | 1997-09-08 | 1998-09-08 | Piezoelectric actuator |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP258001/97 | 1997-09-08 | ||
| CN98119115.0A CN1224247A (en) | 1997-09-08 | 1998-09-08 | Piezoelectric actuator |
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| Publication Number | Publication Date |
|---|---|
| CN1224247A true CN1224247A (en) | 1999-07-28 |
Family
ID=5226283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98119115.0A Pending CN1224247A (en) | 1997-09-08 | 1998-09-08 | Piezoelectric actuator |
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| Country | Link |
|---|---|
| CN (1) | CN1224247A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344007C (en) * | 2000-12-20 | 2007-10-17 | 高压马达乌普萨拉有限公司 | Double electromechanical element |
| CN103321891A (en) * | 2013-06-19 | 2013-09-25 | 重庆中镭科技有限公司 | Vibrator of piezoelectric pump and control method |
| CN104213325A (en) * | 2014-09-22 | 2014-12-17 | 福建省鑫港纺织机械有限公司 | Piezoelectric jacquard element applicable to coarse needle pitches |
| CN109869360A (en) * | 2019-03-01 | 2019-06-11 | 浙江师范大学 | Portable pure water hydraulics system |
-
1998
- 1998-09-08 CN CN98119115.0A patent/CN1224247A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344007C (en) * | 2000-12-20 | 2007-10-17 | 高压马达乌普萨拉有限公司 | Double electromechanical element |
| CN103321891A (en) * | 2013-06-19 | 2013-09-25 | 重庆中镭科技有限公司 | Vibrator of piezoelectric pump and control method |
| CN104213325A (en) * | 2014-09-22 | 2014-12-17 | 福建省鑫港纺织机械有限公司 | Piezoelectric jacquard element applicable to coarse needle pitches |
| CN109869360A (en) * | 2019-03-01 | 2019-06-11 | 浙江师范大学 | Portable pure water hydraulics system |
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