CN203429356U - Piezoelectric driving piece used for weft knitting machine needle selector - Google Patents
Piezoelectric driving piece used for weft knitting machine needle selector Download PDFInfo
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- CN203429356U CN203429356U CN201320374677.2U CN201320374677U CN203429356U CN 203429356 U CN203429356 U CN 203429356U CN 201320374677 U CN201320374677 U CN 201320374677U CN 203429356 U CN203429356 U CN 203429356U
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- driving plate
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- knitting machine
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Abstract
A piezoelectric driving piece used for a weft knitting machine needle selector comprises a bimorph piezoelectric driving piece body composed of an upper piezoelectric body, a lower piezoelectric body, a washer, an adhesive glue layer, a conductive electrode layer and a conductive copper foil, wherein the upper piezoelectric body and the lower piezoelectric body are identical in size. The piezoelectric driving piece is characterized in that the washer is prepared through one-way glass fibers or one-way carbon fiber reinforced epoxy resin materials. The piezoelectric driving piece effectively solves the problems that a washer of an existing piezoelectric driving piece for a weft knitting machine needle selector fatigues repeatedly and service life is short.
Description
Technical field
The utility model relates to the driving chip of slide cam selector, particularly relates to the piezoelectric driving plate that a kind of weft-knitting machine slide cam selector is used.
Background technology
In recent years, piezo-electric drive units, due to simple in structure, without advantages such as electromagnetic interference, is widely used in electronic apparatus aspect, and piezoelectricity slide cam selector is extensive use in the international market gradually.Slide cam selector is the important device in knitting machine field, and slide cam selector is to consist of frame, piezo-electric drive units and cutter head etc., and wherein most important element is the piezoelectric driving plate in piezo-electric drive units.Known weft-knitting machine slide cam selector piezo-electric drive units forms (see figure 1) by cutter head connector 1, piezoelectric driving plate 2, axis 3, piezoelectric driving plate fixed connecting piece 4, it is the crooked driving principle design that utilizes piezoelectricity symmetric double diaphragm, specifically adopt piezoelectric driving plate as conversion element, the pulse signal that utilizes controller to send acts on piezoelectric driving plate, inverse piezoelectric effect by piezoelectric driving plate, take its axis as back shaft, make piezoelectric driving plate generation deflection displacement and bending moment control needle selection.
The pad of existing piezoelectric driving plate generally adopts latten(-tin), beryllium-bronze sheet, stainless steel substrates, macromolecular material or other special materials etc.But the pad of the piezoelectric driving plate that above-mentioned material forms is very easy to fatigue damage in bimorph drives bending deformation process repeatedly, even there is fracture and punch-through, cause piezoelectric driving plate to lose efficacy, and then shutdown maintenance.
Summary of the invention
The purpose of this utility model is exactly for overcoming the deficiency of above-mentioned background technology, and a kind of structure of slide cam selector piezoelectric driving plate is provided, effectively solve pad in piezoelectric driving plate repeatedly fatigue life deficiency problem.
The technical solution of the utility model is: a kind of weft-knitting machine slide cam selector piezoelectric driving plate is provided, the bimorph type piezoelectric driving plate that it is comprised of upper piezoelectrics, lower piezoelectric body, pad, bonding glue-line, conductive electrode layer, copper-foil conducting electricity, piezoelectrics are comprised of piezoelectrics such as PZT, measure-alike and the symmetrical pad both sides that are bonded in of the upper piezoelectrics of bimorph type piezoelectric driving plate and lower piezoelectric body, is characterized in that: pad is prepared by unidirectional fibre reinforced epoxy material.
According to another feature of the present utility model, pad is prepared by unidirectional glassfiber reinforced epoxy.
According to another feature of the present utility model, pad is prepared by Unidirectional fiber reinforced epoxy.
The piezoelectric driving plate that is unidirectional glassfiber reinforced epoxy for pad, because pad is insulator, the polarization mode of upper piezoelectrics, lower piezoelectric body can be selected " positive and negative negative just ", " positive and negative " or " negative positive and negative " polarization mode according to reality, and type of drive can be by the operating voltage with some cycles or instruction separately separately, simultaneously or driven.
It for pad, is the piezoelectric driving plate of Unidirectional fiber reinforced epoxy, because pad is conductor, the polarization mode of upper piezoelectrics, lower piezoelectric body can be selected " positive and negative negative just " or " positive and negative " polarization mode according to reality, and type of drive can be by the operating voltage with some cycles or instruction separately separately, simultaneously or driven.
The utlity model has the advantage that piezoelectric driving plate functional reliability is high, fatigue life is longer.
Accompanying drawing explanation
Fig. 1 weft-knitting machine slide cam selector piezo-electric drive units structural representation
The piezoelectric driving plate structural representation of Fig. 2 glass fiber reinforced epoxy resin pad
The structural representation of Fig. 3 glass fiber reinforced epoxy resin pad
Piezoelectric driving plate inoperative schematic diagram under Fig. 4 " negative positive and negative " polarization mode
Upper piezoelectrics under Fig. 5 " negative positive and negative " polarization mode apply the work schematic diagram of positive voltage
Lower piezoelectric body under Fig. 6 " negative positive and negative " polarization mode applies the work schematic diagram of positive voltage
The voltage waveform view of the independent driven of Fig. 7 positive voltage
Piezoelectric driving plate inoperative schematic diagram under Fig. 8 " positive and negative " polarization mode
The work schematic diagram that applies positive voltage under Fig. 9 " positive and negative " polarization mode
The work schematic diagram that applies negative voltage under Figure 10 " positive and negative " polarization mode
The voltage waveform view that Figure 11 generating positive and negative voltage drives simultaneously
The piezoelectric driving plate structural representation of Figure 12 carbon-fibre reinforced epoxy resin pad
The structural representation of Figure 13 carbon-fibre reinforced epoxy resin pad
Piezoelectric driving plate inoperative schematic diagram under Figure 14 " positive and negative just bearing " polarization mode
Upper piezoelectrics under Figure 15 " positive and negative just bearing " polarization mode apply the work schematic diagram of positive voltage
Lower piezoelectric body under Figure 16 " positive and negative just bearing " polarization mode applies the work schematic diagram of positive voltage
In above-mentioned figure: 1. cutter head connector; 2. piezoelectric driving plate; The piezoelectric driving plate of 2a. glass fiber reinforced epoxy resin pad; The piezoelectric driving plate of 2b. carbon-fibre reinforced epoxy resin pad; 3. axis; 4. piezoelectric driving plate fixed connecting piece; 21. bonding glue-lines; 22. conductive electrode layers; Piezoelectrics on 23.; 24. lower piezoelectric bodies; 25. glass fiber reinforced epoxy resin pads; 26. copper-foil conducting electricities; 27. carbon-fibre reinforced epoxy resin pads; 251. one-way glass fibre bundles; 252. epoxy resin; 271. unidirectional carbon fiber tow.
The specific embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described in detail.
The upper piezoelectrics 23 of the piezoelectric driving plate 2a of glass fiber reinforced epoxy resin pad, the polarization mode of lower piezoelectric body 24 polarize according to " negative positive and negative " mode in Fig. 4, and in figure, P is piezoelectrics polarised direction, lower same.Upper piezoelectrics 23, lower piezoelectric body 24 be independent positive voltage driven respectively, and in figure, E is that piezoelectrics apply direction of an electric field, lower same.The lower surface electrode of the upper surface electrode of upper piezoelectrics 23 and lower piezoelectric body 24 adopts wire to interconnect and draw wire and forms ground wire zero potential, between the driving voltage U1 of upper piezoelectrics 23 is added between the lower surface electrode and zero potential of piezoelectrics 23, the driving voltage U2 of lower piezoelectric body 24 is added in lower piezoelectric body 24 upper surface electrode and zero potential (Fig. 4); The waveform of driving voltage U1, U2 adopts the square wave after rectification as shown in Figure 7, and its solid line waveform is that U1, dotted line waveform are U2; U1, U2 are only positive voltage in scope shown in waveform separately, are At All Other Times no-voltage.
Fig. 4 is that upper piezoelectrics 23, lower piezoelectric body 24 are not all executed alive nature, and piezoelectric driving plate does not deform.While applying positive voltage U1=Vdc on upper piezoelectrics 23, the driving voltage U2=0V of lower piezoelectric body 24, in short circuit dischange state, now going up piezoelectrics 23 shrinks because of inverse piezoelectric effect, and lower piezoelectric body 24 does not produce inverse piezoelectric effect deformation, as shown in Fig. 5 dotted line: upper piezoelectrics 23 drive whole piezoelectric driving plate to be bent upwards distortion; While instantly applying positive voltage U2=Vdc on piezoelectrics 24, now go up the driving voltage U1=0V of piezoelectrics 23, in short circuit dischange state, lower piezoelectric body 24 shrinks because of inverse piezoelectric effect, and upper piezoelectrics 23 do not produce inverse piezoelectric effect deformation, as shown in Fig. 6 dotted line: lower piezoelectric body 24 drives whole piezoelectric driving plate to be bent downwardly distortion.The alternative expression work in the manner described above under cycling voltage separately of upper piezoelectrics 23 and lower piezoelectric body 24, piezoelectric driving plate generating period is out of shape up and down, and then drives needle selector tool bit motion, realizes needle selecting function.
In the present embodiment, it is long that upper and lower piezoelectrics are of a size of 45mm() * 7mm(is wide) * 0.25mm(is thick), glass fiber reinforced epoxy resin spacer thickness adopts 0.25mm; Driving voltage U1, U2 are 195V square wave.Adopt piezoelectric driving plate prepared by above-mentioned parameter can complete normal needle selection work, and reliable operation degree and work fatigue life-span are obviously better than the piezoelectric driving plate of traditional stainless steel gasket of same structure.
The upper piezoelectrics 23 of the piezoelectric driving plate 2a of glass fiber reinforced epoxy resin pad, the polarization mode of lower piezoelectric body 24 polarize according to " positive and negative " mode in Fig. 8, and upper piezoelectrics 23 are identical with the polarised direction of lower piezoelectric body 24.The upper surface electrode of the lower surface electrode of upper piezoelectrics 23 and lower piezoelectric body 24 adopts wire to interconnect and draw wire and forms ground wire zero potential, the lower surface electrode of the upper surface electrode of upper piezoelectrics 23 and lower piezoelectric body 24 adopts wire to interconnect and draw wire and forms driving current potential, driving voltage U1 is applied to and drives between current potential and zero potential, the positive and negative square wave after the waveform rectification of driving voltage U1.
Fig. 8 is that upper piezoelectrics 23, lower piezoelectric body 24 are not all executed alive nature, and piezoelectric driving plate does not deform.While applying positive voltage U1=Vdc on to upper piezoelectrics 23, lower upper piezoelectrics 24, the polarised direction P of upper piezoelectrics 23 is with to apply direction of an electric field E identical, upper piezoelectrics 23 shrink distortion because of inverse piezoelectric effect, simultaneously the polarised direction of lower piezoelectric body 24 is with to apply direction of an electric field contrary, lower piezoelectric body 24 is because of inverse piezoelectric effect generation elongation strain, from macroscopic view, show as piezoelectric driving plate and be bent upwards distortion, as shown in Fig. 9 dotted line.While applying negative voltage U1=-Vdc on to upper piezoelectrics 23, lower upper piezoelectrics 24, the polarised direction P of upper piezoelectrics 23 is with to apply direction of an electric field E contrary, upper piezoelectrics 23 are because of inverse piezoelectric effect generation elongation strain, simultaneously the polarised direction of lower piezoelectric body 24 is with to apply direction of an electric field identical, lower piezoelectric body 24 shrinks distortion because of inverse piezoelectric effect, from macroscopic view, show as piezoelectric driving plate and be bent downwardly distortion, as shown in Figure 10 dotted line.Upper piezoelectrics 23 and lower piezoelectric body 24 be distortion up and down repeatedly under the effect of cycling voltage, drives piezoelectric driving plate generating period to be out of shape up and down, and then drives needle selector tool bit motion, realizes needle selecting function.
In the present embodiment, it is long that upper and lower piezoelectrics are of a size of 45mm() * 7mm(is wide) * 0.25mm(is thick), glass fiber reinforced epoxy resin spacer thickness adopts 0.25mm; Driving voltage U1=+90V ,-90V square wave.Adopt piezoelectric driving plate prepared by above-mentioned parameter can complete normal needle selection work, and reliable operation degree and work fatigue life-span are obviously better than the piezoelectric driving plate of traditional stainless steel gasket of same structure.
The upper piezoelectrics 23 of the piezoelectric driving plate 2b of carbon-fibre reinforced epoxy resin pad, the polarization mode of lower piezoelectric body 24 polarize according to " the positive and negative just bearing " mode in Figure 14.The driving voltage U1 of upper piezoelectrics 23 is added in upper surface electrode and the copper-foil conducting electricity 26(zero potential of piezoelectrics 23) between, the driving voltage U2 of lower piezoelectric body 24 is added in lower surface electrode and the copper-foil conducting electricity 26(zero potential of lower piezoelectric body 24) between.Upper piezoelectrics 23, lower piezoelectric body 24 be independent positive voltage driven respectively, and driving voltage U1, U2 waveform are with embodiment 1.The same manner as in Example 1, execute alive direction of an electric field identical with the polarised direction of upper piezoelectrics 23, lower piezoelectric body 24.The operation principle of this polarization mode is all identical with embodiment 1.
In the present embodiment, it is long that upper and lower piezoelectrics are of a size of 45mm() * 7mm(is wide) * 0.25mm(is thick), carbon-fibre reinforced epoxy resin spacer thickness adopts 0.25mm; Driving voltage U1, U2 are 195V square wave.Adopt piezoelectric driving plate prepared by above-mentioned parameter can complete normal needle selection work, and reliable operation degree and work fatigue life-span are obviously better than the piezoelectric driving plate of traditional stainless steel gasket of same structure.
Adopt piezoelectric driving plate of the present invention structure, effectively solve pad in weft-knitting machine slide cam selector piezoelectric driving plate repeatedly fatigue life deficiency problem.
Claims (3)
1. a weft-knitting machine slide cam selector piezoelectric driving plate, the bimorph type piezoelectric driving plate (2) that it is comprised of upper piezoelectrics (23), lower piezoelectric body (24), pad, bonding glue-line (21), conductive electrode layer (22), copper-foil conducting electricity (26), upper piezoelectrics (23) are measure-alike with lower piezoelectric body (24), it is characterized in that: pad adopts unidirectional fibre reinforced epoxy material to prepare.
2. a kind of weft-knitting machine slide cam selector piezoelectric driving plate according to claim 1, is characterized in that pad prepared by unidirectional glassfiber reinforced epoxy.
3. a kind of weft-knitting machine slide cam selector piezoelectric driving plate according to claim 1, is characterized in that pad prepared by Unidirectional fiber reinforced epoxy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320374677.2U CN203429356U (en) | 2013-06-27 | 2013-06-27 | Piezoelectric driving piece used for weft knitting machine needle selector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320374677.2U CN203429356U (en) | 2013-06-27 | 2013-06-27 | Piezoelectric driving piece used for weft knitting machine needle selector |
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| CN203429356U true CN203429356U (en) | 2014-02-12 |
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| CN201320374677.2U Expired - Lifetime CN203429356U (en) | 2013-06-27 | 2013-06-27 | Piezoelectric driving piece used for weft knitting machine needle selector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157782A (en) * | 2014-08-19 | 2014-11-19 | 昆山攀特电陶科技有限公司 | Novel warp knitting machine piezoelectric jacquard element |
-
2013
- 2013-06-27 CN CN201320374677.2U patent/CN203429356U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157782A (en) * | 2014-08-19 | 2014-11-19 | 昆山攀特电陶科技有限公司 | Novel warp knitting machine piezoelectric jacquard element |
| CN104157782B (en) * | 2014-08-19 | 2017-10-20 | 苏州攀特电陶科技股份有限公司 | Tricot machine piezoelectric jacquard element |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140212 |