CN111197196A - Piezoelectric needle selector and piezoelectric needle selection assembly - Google Patents
Piezoelectric needle selector and piezoelectric needle selection assembly Download PDFInfo
- Publication number
- CN111197196A CN111197196A CN202010060885.XA CN202010060885A CN111197196A CN 111197196 A CN111197196 A CN 111197196A CN 202010060885 A CN202010060885 A CN 202010060885A CN 111197196 A CN111197196 A CN 111197196A
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- China
- Prior art keywords
- piezoelectric
- electrode contact
- piezoelectric bimorph
- needle
- needle selection
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
- D04B15/68—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Knitting Machines (AREA)
Abstract
The invention relates to the technical field of textile equipment, and discloses a piezoelectric needle selector and a piezoelectric needle selecting assembly, wherein the piezoelectric needle selector comprises: the flexible connector comprises a piezoelectric bimorph, a plastic fixing piece and three flexible connecting pieces, wherein one end of the piezoelectric bimorph is provided with a first electrode contact, a second electrode contact and a third electrode contact; one end of the piezoelectric bimorph is embedded into the plastic fixing piece to form a coating structure; one end of each of the three flexible connecting pieces penetrates through a small hole reserved in the plastic fixing piece and is connected with three electrode contacts at one end of the piezoelectric bimorph respectively. The invention avoids the phenomenon of abrasion or failure of injection molding parts, the piezoelectric bimorph only has one free end to swing, the wafer is prevented from cracking in the manufacturing and high-frequency swing application links, the performance is better in the high-frequency swing process, the reliability is greatly improved, the service life of the piezoelectric needle selection piece is prolonged, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of textile equipment, in particular to a piezoelectric needle selection piece and a piezoelectric needle selection assembly.
Background
The piezoelectric needle selector is a key actuator for needle selection jacquard knitting of a circular knitting machine, and the piezoelectric needle selector and the needle selection assembly are core constituent units of the piezoelectric needle selector. The piezoelectric needle selection piece is an energy conversion element which converts electric energy into mechanical energy by utilizing the inverse piezoelectric effect of the piezoelectric ceramic pieces, and square wave pulse voltage of the driving unit alternately acts on the two piezoelectric ceramic pieces to enable the piezoelectric needle selection piece to generate contraction and expansion deformation to form deflection displacement, so that the piezoelectric needle selection piece free end pokes the needle selection assembly to swing up and down according to the process requirement to press jacquard piece teeth to complete jacquard needle selection. The needle selecting component is a bridge component for connecting the piezoelectric needle selecting piece of the needle selector and the jacquard piece of the circular knitting machine, the quality and precision of the needle selecting component directly influence the accuracy of jacquard needle selection of the circular knitting machine and influence the operation stability and smoothness of a needle cylinder of the circular knitting machine. In addition, the two are reasonably matched, and the stable deflection is the key for realizing needle selection.
As shown in fig. 1, a known piezoelectric needle selector needs three parts (indicated by a dashed circle in fig. 1) for injection molding, the requirement on the precision of the injection molding process is high, if three injection molding parts have position deviation during actual injection molding, in the links of manufacturing and high-frequency swing application, friction exists between an injection molding part and an installation position of the injection molding part, so that the injection molding part is abraded or loses efficacy, and even when a plurality of forces transmitted by a plurality of injection molding parts to a wafer are uneven, the wafer is cracked, so that the service life of the piezoelectric needle selector is shortened, and the production cost is increased.
Disclosure of Invention
The invention provides a piezoelectric needle selector and a piezoelectric needle selecting assembly, which solve the problems that in the prior art, the piezoelectric needle selector is easy to cause cracks on a wafer, abrasion or failure of an injection molding part in the manufacturing and high-frequency swing application links, the service life of the piezoelectric needle selector is shortened, and the production cost is increased.
The invention provides a piezoelectric needle selector, comprising: the flexible connector comprises a piezoelectric bimorph, a plastic fixing piece and three flexible connecting pieces, wherein one end of the piezoelectric bimorph is provided with a first electrode contact, a second electrode contact and a third electrode contact; one end of the piezoelectric bimorph is embedded into the plastic fixing piece to form a coating structure; one end of each of the three flexible connecting pieces penetrates through a small hole reserved in the plastic fixing piece and is connected with three electrode contacts at one end of the piezoelectric bimorph respectively.
The flexible connecting piece is a metal spring or a contact pin with a metal spring structure.
The three flexible connecting pieces are electrically connected with the first electrode contact, the second electrode contact and the third electrode contact respectively by adopting conductive adhesive.
Wherein the piezoelectric bimorph includes: the carbon fiber substrate is provided with an inner conductive metal layer, a piezoelectric ceramic layer, an outer conductive metal layer and an outer conductive coating in sequence on two sides, one end of the carbon fiber substrate is provided with an electrode extension part, and the first electrode contact is arranged on the electrode extension part and connected with the inner conductive metal layer; and one end of the outer conductive coating layer, which is close to the electrode extension part, is provided with an area exposed out of the outer conductive metal layer so as to form the second electrode contact and the third electrode contact respectively.
The invention also provides a piezoelectric needle selection assembly, comprising: the piezoelectric needle selector comprises a needle selection blade, a plastic support and the piezoelectric needle selector, wherein one end of the plastic support is connected with the other end of the piezoelectric bimorph, and the other end of the plastic support is connected with the needle selection blade.
The piezoelectric bimorph is characterized in that an n-shaped groove is formed in the connecting end of the plastic support piece and the piezoelectric bimorph, a positioning hole consistent with the needle selecting blade is formed in the plastic support piece, and a pivoting positioning pin hole for inserting a positioning pin is formed between the positioning hole and the n-shaped groove.
Wherein, the inner side of the opening of the n-shaped groove is provided with symmetrical arc-shaped bosses.
Wherein the cross section of the pivoting positioning pin hole is square or triangular.
Wherein, the two sides of the bottom of the needle selection blade are respectively provided with a semicircular reinforcing hole.
The piezoelectric needle selector only has the plastic fixing piece injected at one end of the piezoelectric bimorph, and the flexible connecting piece is connected with the upper electrode of the piezoelectric bimorph, so the precision requirement on injection molding and installation is low, the plastic fixing piece is fastened on the frame of the piezoelectric needle selector to form a cantilever beam type structure, the abrasion or failure phenomenon of an injection molding piece is avoided, the piezoelectric bimorph only has one free end stressed to realize swinging, the cracks of the wafer in the manufacturing and high-frequency swinging application links are avoided, the performance is better in the high-frequency swinging process, the reliability is greatly improved, the service life of the piezoelectric needle selector is prolonged, and the production cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a piezoelectric needle selector in the prior art;
fig. 2 is a schematic structural view of a piezoelectric needle selector according to the present invention;
FIG. 3 is a schematic view of a plastic fastener structure of the piezoelectric pin selector plate of FIG. 2;
FIG. 4 is a schematic diagram of an exploded structure of a piezoelectric bimorph of the piezoelectric needle selector in FIG. 2;
FIG. 5 is a schematic diagram of a piezoelectric bimorph structure of the piezoelectric needle selector in FIG. 2;
FIG. 6 is a schematic structural view of a piezoelectric needle selection assembly according to the present invention;
fig. 7 is a schematic structural view of a needle selecting blade of the piezoelectric needle selecting assembly in fig. 6;
FIG. 8 is a schematic view of the plastic support structure of the piezoelectric needle selection assembly of FIG. 6;
fig. 9 is a schematic view showing the connection of the selector blade and the plastic support.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A first embodiment of the present invention provides a piezoelectric selector jack, as shown in fig. 2 to 5, including: the piezoelectric bimorph comprises a piezoelectric bimorph 10, a plastic fixing piece 20 and three flexible connecting pieces 30, wherein one end of the piezoelectric bimorph 10 is provided with a first electrode contact 15, a second electrode contact 17 and a third electrode contact 18, one end of the piezoelectric bimorph 10 is embedded into the plastic fixing piece 20 to form a coating structure, and one end of each of the three flexible connecting pieces 30 penetrates through a small hole reserved in the plastic fixing piece 20 and is connected with the three electrode contacts at one end of the piezoelectric bimorph 10. The flexible connection member enables the plastic fixing member 20 to have a cushioning effect on vibration after being mounted on the frame of the piezoelectric needle selector, so that mounting accuracy can be reduced.
The piezoelectric needle selector of the embodiment is only provided with the plastic fixing piece 20 (without aligning a plurality of injection molding pieces) at one end of the piezoelectric bimorph 10 in an injection molding manner, and the flexible connecting piece is connected with the electrode contact on the piezoelectric bimorph 10, so the precision requirement on injection molding and installation is low, the plastic fixing piece 20 is fastened on the piezoelectric needle selector frame to form a cantilever beam type structure, the phenomenon of abrasion or failure of the injection molding piece is avoided, the piezoelectric bimorph 10 is provided with only one free end to be stressed to realize swinging, the phenomenon that the wafer cracks appear in the manufacturing and high-frequency swinging application links is avoided, the high-frequency swinging process is better in performance, the reliability is greatly improved, the service life of the piezoelectric bimorph 10 is prolonged, and the production cost is reduced.
Specifically, the plastic fixing member 20 is connected to the piezoelectric needle selector frame, and the plastic fixing member 20 is provided with an upper long elliptic fixing column 21, an upper short elliptic fixing column 22, a lower long elliptic fixing column 24, and a lower circular fixing column 23. The upper long elliptic fixing column 21 and the upper short elliptic fixing column 22 are fixed on a cover plate of a piezoelectric needle selector frame, and the lower long elliptic fixing column 24 and the lower circular fixing column 23 are fixed on a circuit board of the piezoelectric needle selector to form an effective cantilever beam structure with four points clamped by two points at the upper part and the lower part. The plastic fixing member 20 and the piezoelectric bimorph 10 are preferably connected by an injection molding process, or the plastic fixing member 20 and the piezoelectric bimorph 10 are directly bonded, but the structure for stably fixing is not limited to the above structure.
The flexible connection members 30 may be springs or pins having a metal spring structure (not limited to the above structure), and the three flexible connection members 30 are electrically connected to the first electrode contact 15, the second electrode contact, and the third electrode contact, respectively, using conductive paste. In this embodiment, the flexible connecting element is a spring 30, one end of each of the three springs 30 passes through a preset hole of the plastic fixing element 20, and one end of each of the three springs 30 is connected to the first electrode contact 15, the second electrode contact 17 and the third electrode contact 18 through the conductive adhesive injection hole 25, and the other end of each of the three springs forms three conductive ends for connecting to the driving circuit board. Compared with the traditional connection mode, the spring 30 forms soft elastic connection, plays a role in damping, can avoid direct stress on the conductive end part, and prevents the phenomenon of poor contact caused by vibration of the splicing part and conductive adhesive in the working process of the piezoelectric needle selector.
In the present embodiment, the piezoelectric bimorph 10 includes: the carbon fiber substrate 16 is provided with an inner conductive metal layer 14, a piezoelectric ceramic layer 13, an outer conductive metal layer 12 and an outer conductive coating 11 on two sides of the carbon fiber substrate 16 in sequence, one end of the carbon fiber substrate 16 is provided with an electrode extension part 19, and the first electrode contact 15 is arranged on the electrode extension part 19 and connected with the inner conductive metal layer 14; one end of the outer conductive coating adjacent to the electrode extension 19 is provided with an area where the outer conductive metal layer is exposed to form the second electrode contact and the third electrode contact, respectively.
Specifically, an outer conductive metal layer 12 and an inner conductive metal layer 14 are formed on both sides of the piezoelectric ceramic sheet 13, a carbon fiber substrate 16 and the inner conductive metal layer 14 are integrated with a first electrode 15 of an extension portion by an adhesive process, the first electrode 15 and the inner conductive metal layer 14 are connected and conducted, and an outer conductive coating 11 is deposited on the surface of the outer conductive metal layer 12. Due to the conductive property of the carbon fiber, the inner conductive metal layer 14 between the two piezoelectric ceramic sheets 13 is communicated and conducted, and then is led out from the first electrode 15. The end of the outer conductive coating 11 adjacent to the electrode extension 19 is provided with an area where the outer conductive metal layer is exposed to form said second electrode contact 17 and said third electrode contact 18, respectively.
In this embodiment, the structure of the outer conductive metal layer 12 exposed out of the corresponding side on the outer conductive coating 11 is a comb structure (which may also be a mesh structure or a structure with a plurality of small holes), the outer conductive coating 11 can play a role in enhancing conductivity, and the comb structure can expose the outer conductive metal layer 12, so that the outer conductive metal layer 12 is conveniently connected with a conductive adhesive during subsequent injection molding, and more reliable conductivity is achieved.
In the piezoelectric bimorph 10 of the present embodiment, three conductive electrodes are formed at the rear end portion of the piezoelectric bimorph 10, and the piezoelectric bimorph 10 is entirely covered with the insulating layer in addition to the three conductive electrode portions, thereby preventing the ceramic from being weak and malfunctioning due to excessive leakage current caused by poor insulation, avoiding electrical safety problems such as electric shock, and improving the reliability of the piezoelectric bimorph.
A second embodiment of the present invention provides a piezoelectric needle selection assembly, as shown in fig. 6 to 9, including: the needle selection blade 50, the plastic support 60 and any one of the piezoelectric needle selection blades described above, wherein one end of the plastic support 60 is connected to the other end of the piezoelectric bimorph 10, and the other end of the plastic support 60 is connected to the needle selection blade 50.
An n-shaped groove 63 is formed at the connecting end of the plastic support 60 and the piezoelectric bimorph 10, a positioning hole corresponding to the needle selecting blade 50 is formed in the plastic support 60, and a pivot positioning pin hole 61 for inserting the positioning pin 40 is formed between the positioning hole and the n-shaped groove 63. When the bimorph 10 bends, deforms and swings, the opening of the n-shaped groove 63 is shifted by the end of the bimorph 10 and swings, and further drives the plastic support 60 and the needle selecting blade 50 to swing around the positioning pin 40.
Symmetrical arc-shaped bosses 64 are arranged on the inner sides of the openings of the n-shaped grooves 63, and when the piezoelectric bimorph 10 deforms, the arc-shaped bosses 64 take the semicircular bosses 64 as supporting surfaces to form arc bending motion, so that the piezoelectric bimorph can swing more smoothly.
The cross section of the pivoting positioning pin hole 61 is square or triangular, and in fig. 8 and 9, the cross section of the pivoting positioning pin hole 61 is square, so that the advantage is that the contact area of the positioning pin 40 with the hole walls of the pivoting positioning pin hole 61 after being inserted is small, namely, the positioning pin is in line contact with four hole walls of the pivoting positioning pin hole 61, and therefore, compared with the traditional round pivoting positioning pin hole, the friction is small, and the reliability is high when the cantilever beam piezoelectric needle selector is matched for a long time to complete needle selection action.
In this embodiment, the needle selecting blade 50 includes a cutter head 58, a cutter handle 51, and a connecting seat 59, which are integrally formed, and the connecting seat 59 is wrapped in a plastic support 60. The end of the cutter head 58 is provided with a flat needle pressing part 53 and an inclined contact part 52, namely, the contact surface of the cutter head is manufactured into a section of inclined contact part 52 and a section of flat needle pressing part 53 according to the size required by the stitching of the jacquard chip teeth of the circular knitting machine, and the jacquard chip teeth of the circular knitting machine move along the combined contact surface during needle pressing to form needle pressing, jacquard and needle selecting actions.
Semicircular reinforcing holes, namely a first semicircular reinforcing hole 55 and a second semicircular reinforcing hole 56, are respectively formed in two sides of the bottom of the needle selecting blade 50 (namely two sides of the connecting seat 59), and the semicircular reinforcing holes are used for reinforcing the mechanical strength of an injection molding part. The connecting seat is provided with a first process positioning hole 54, the side wall of the cavity is provided with a second process positioning hole 62 which is used for matching and positioning with the first process positioning hole 54, during injection molding, the first process positioning hole 54 and the second process positioning hole 62 are overlapped, the center of the needle selecting blade 50 is ensured to be overlapped with the center of the plastic supporting piece 60, and the bottom plane 57 of the needle selecting blade 50 is positioned at the upper edge of the pivoting positioning pin hole 61.
Therefore, the piezoelectric needle selection assembly of the embodiment can convert the telescopic deformation displacement generated by the inverse piezoelectric effect of the piezoelectric needle selection piece into the pivoting needle selection swing of the needle selection piece, and accurately realize the needle selection by pressing the jacquard piece teeth according to the needle selection requirement, and the piezoelectric needle selection assembly has a simple structure and is easy for mass production.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A piezoelectric selector jack, comprising: the flexible connector comprises a piezoelectric bimorph, a plastic fixing piece and three flexible connecting pieces, wherein one end of the piezoelectric bimorph is provided with a first electrode contact, a second electrode contact and a third electrode contact; one end of the piezoelectric bimorph is embedded into the plastic fixing piece to form a coating structure; one end of each of the three flexible connecting pieces penetrates through a small hole reserved in the plastic fixing piece and is connected with three electrode contacts at one end of the piezoelectric bimorph respectively.
2. The piezoelectric selector jack of claim 1, wherein the flexible connecting member is a metal spring or a pin with a metal spring structure.
3. The piezoelectric selector jack of claim 1, wherein the three flexible connecting members are electrically connected to the first electrode contact, the second electrode contact, and the third electrode contact, respectively, with conductive paste.
4. A piezoelectric needle selector as claimed in any one of claims 1 to 3, wherein the piezoelectric bimorph includes: the carbon fiber substrate is provided with an inner conductive metal layer, a piezoelectric ceramic layer, an outer conductive metal layer and an outer conductive coating in sequence on two sides, one end of the carbon fiber substrate is provided with an electrode extension part, and the first electrode contact is arranged on the electrode extension part and connected with the inner conductive metal layer; and one end of the outer conductive coating layer, which is close to the electrode extension part, is provided with an area exposed out of the outer conductive metal layer so as to form the second electrode contact and the third electrode contact respectively.
5. A piezoelectric needle selection assembly, comprising: the needle selection blade, the plastic support and the piezoelectric needle selection blade according to any one of claims 1 to 4, wherein one end of the plastic support is connected to the other end of the piezoelectric bimorph, and the other end of the plastic support is connected to the needle selection blade.
6. The piezoelectric needle selection assembly according to claim 5, wherein the connecting end of the plastic support and the piezoelectric bimorph is provided with an n-shaped groove, the plastic support is provided with a positioning hole corresponding to the needle selection blade, and a pivot positioning pin hole for inserting a positioning pin is provided between the positioning hole and the n-shaped groove.
7. The piezoelectric needle selection assembly of claim 6, wherein symmetrical arc-shaped bosses are provided inside the opening of the n-shaped groove.
8. The piezoelectric needle selector assembly of claim 6 wherein the pivot dowel hole is square or triangular in cross-section.
9. The piezoelectric needle selection assembly of claim 6, wherein semicircular reinforcing holes are respectively formed at both sides of the bottom of the selector blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010060885.XA CN111197196A (en) | 2020-01-19 | 2020-01-19 | Piezoelectric needle selector and piezoelectric needle selection assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010060885.XA CN111197196A (en) | 2020-01-19 | 2020-01-19 | Piezoelectric needle selector and piezoelectric needle selection assembly |
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| CN111197196A true CN111197196A (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010060885.XA Pending CN111197196A (en) | 2020-01-19 | 2020-01-19 | Piezoelectric needle selector and piezoelectric needle selection assembly |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003278059A (en) * | 2002-03-22 | 2003-10-02 | Wac Data Service Kk | Needle selector for knitting machine controlling bound motion of finger and method therefor |
| CN1460138A (en) * | 2001-04-16 | 2003-12-03 | Wac资料服务株式会社 | Needle selector for knitting machine, and needle selecting module finger |
| CN201296831Y (en) * | 2008-09-08 | 2009-08-26 | 朱锋 | Embedding clasp blade for needle selection of needle selecting device of knitting machine |
| CN203440603U (en) * | 2013-05-20 | 2014-02-19 | 义大科技股份有限公司 | Needling selecting device with fault detection function |
| CN203625607U (en) * | 2013-10-23 | 2014-06-04 | 锐而新科技股份有限公司 | Needle selection device piezoelectric patch of protective structure |
| CN106498615A (en) * | 2016-12-22 | 2017-03-15 | 重庆胜普昂凯科技有限公司 | A kind of attachment means for piezoelectricity selection piece and circuit board |
| CN208604304U (en) * | 2018-08-12 | 2019-03-15 | 重庆中镭科技有限公司 | A kind of bimorph selection piece |
| CN110629384A (en) * | 2019-10-08 | 2019-12-31 | 浙江理工大学 | Piezoelectric needle selector perception execution integrated state detection system |
-
2020
- 2020-01-19 CN CN202010060885.XA patent/CN111197196A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1460138A (en) * | 2001-04-16 | 2003-12-03 | Wac资料服务株式会社 | Needle selector for knitting machine, and needle selecting module finger |
| JP2003278059A (en) * | 2002-03-22 | 2003-10-02 | Wac Data Service Kk | Needle selector for knitting machine controlling bound motion of finger and method therefor |
| CN201296831Y (en) * | 2008-09-08 | 2009-08-26 | 朱锋 | Embedding clasp blade for needle selection of needle selecting device of knitting machine |
| CN203440603U (en) * | 2013-05-20 | 2014-02-19 | 义大科技股份有限公司 | Needling selecting device with fault detection function |
| CN203625607U (en) * | 2013-10-23 | 2014-06-04 | 锐而新科技股份有限公司 | Needle selection device piezoelectric patch of protective structure |
| CN106498615A (en) * | 2016-12-22 | 2017-03-15 | 重庆胜普昂凯科技有限公司 | A kind of attachment means for piezoelectricity selection piece and circuit board |
| CN208604304U (en) * | 2018-08-12 | 2019-03-15 | 重庆中镭科技有限公司 | A kind of bimorph selection piece |
| CN110629384A (en) * | 2019-10-08 | 2019-12-31 | 浙江理工大学 | Piezoelectric needle selector perception execution integrated state detection system |
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Application publication date: 20200526 |
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