CN109273174B - Self-center enameled mold for electromagnetic wire - Google Patents
Self-center enameled mold for electromagnetic wire Download PDFInfo
- Publication number
- CN109273174B CN109273174B CN201810976460.6A CN201810976460A CN109273174B CN 109273174 B CN109273174 B CN 109273174B CN 201810976460 A CN201810976460 A CN 201810976460A CN 109273174 B CN109273174 B CN 109273174B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/065—Insulating conductors with lacquers or enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
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- Processes Specially Adapted For Manufacturing Cables (AREA)
Abstract
The invention relates to a processing device of an enameled wire, in particular to a self-center enameled die of an electromagnetic wire, which is used for painting a conductor and comprises a baffle, an enameled box and a painting part, wherein the painting part is provided with a painting hole along an axis parallel to the conductor, the cross section outline shape of the end part of the painting hole at a wire outlet part is the same as that of the conductor, the conductor passes through the painting hole and the baffle, the painting part is arranged on one side of the baffle, which is deviated from the advancing direction of the conductor in a hanging manner, the baffle is provided with an adjusting hole for the conductor to pass through, and the motion track of the conductor is upward along the vertical direction. According to the invention, the lacquered part is arranged on one side of the baffle plate, which is far away from the advancing direction of the conductor, so that the problem of small allowable offset of the conductor in the prior art is solved, and the effect of increasing the allowable offset of the conductor is achieved.
Description
Technical Field
The invention relates to processing equipment of enameled wires, in particular to a self-center enameled die of an electromagnetic wire.
Background
Enamelled wire is a main variety of winding wire and is composed of a conductor in the middle and an insulating layer coated on the outer periphery of the conductor, and the insulating layer is generally formed by uniformly coating the outer periphery of the conductor through a painting mold and heating and curing.
As shown in fig. 1, the existing painting mold includes a baffle 1, a paint box 2 and a painting member 3, an open-ended mounting groove 11 is formed in the baffle 1, a clamping groove 39 (see fig. 2) is formed in an outer surface of the painting member 3, the clamping groove 39 of the painting member 3 is clamped in the mounting groove 11, a gap is reserved between the clamping groove 39 and the mounting groove 11, a painting hole 31 (see fig. 2) is formed in a center portion of the painting member 3, the painting hole 31 is a through hole, a conductor 4 of an enameled wire firstly coats a layer of painting on an outer surface of the conductor through the paint box 2, then the conductor 4 passes through the painting hole 31, the painting on the outer surface of the conductor 4 is uniformly smeared under the action of the painting hole 31, and the enameled wire is formed.
The defects of the prior art are that the conductor 4 generates a certain eccentricity due to the error of the conveying winding drum in the transportation process, the conductor 4 drives the painting part 3 to deviate in the installation groove 11 when the eccentricity is generated, if the deviation amplitude is smaller, the painting part 3 can also deviate in the reserved clearance range between the clamping groove 39 and the installation groove 11, and the conductor 4 can be ensured to be approximately positioned in the center of the painting hole 31 under the resistance action of liquid painting between the conductor 4 and the painting hole 31; if the deviation amplitude is large, the deviation amount of the painting part 3 exceeds the reserved gap between the clamping groove 39 and the mounting groove 11, so that the conductor 4 overcomes the resistance of liquid painting between the conductor 4 and the painting hole 31, the conductor 4 is deviated in the painting hole 31, the thickness of the painting on the outer surface of the conductor 4 after the conductor 4 passes through the painting hole 31 is uneven, and the quality of the enameled wire is seriously influenced.
Disclosure of Invention
The invention aims to provide a self-centering enamelling die for an electromagnetic wire, which solves the problem of uneven enamelling when a conductor generates a large offset in the prior art, and achieves the effect of increasing the allowable offset of the conductor on the premise of not influencing the enamelling effect.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides an electromagnetic wire from center alclad mould for paint to the conductor, including baffle, lacquer box and painting, the painting has seted up the hole of scribbling along the axis that is on a parallel with the conductor, and the tip cross section profile shape of painting hole department of being qualified for the next round of competitions is the same with the cross section profile shape of conductor, and the conductor passes the hole of scribbling and the baffle, and the painting is located the one side that the baffle deviates from conductor advancing direction, offers the regulation hole that supplies the conductor to pass on the baffle.
By adopting the technical scheme, after the conductor is adhered with a large amount of paint liquid through the paint box, the paint liquid on the conductor can be driven to enter the painting hole of the painting part along with the conveying of the conductor, and the paint liquid can be uniformly coated on the conductor after being blocked in the painting hole; when the conductor shifts, the paint liquid can automatically push the painted part to move through the resistance of the paint liquid between the conductor and the painted hole so as to achieve the purpose that the conductor and the painted hole are concentric, and the shift amount capable of allowing the conductor to shift is used for adjusting the distance between the hole and the conductor, so that the shift amount allowed to be generated by the conductor is greatly increased under the condition that the same baffle plate is adopted.
Preferably, the motion track of the conductor is upward along the vertical direction.
By adopting the technical scheme, when the conductor moves vertically upwards, the conductor drives the coating to generate resistance on the painted part so as to overcome the gravity of the painted part, so that the painted part is in a suspended state or is abutted against the baffle; compared with other advancing tracks of the conductor, when the conductor moves vertically upwards, the painted part is not influenced by self gravity in the moving direction perpendicular to the conductor, the self-aligning effect of the painted part is most obvious, and the painted layer on the outer surface of the conductor is more uniform.
Preferably, the gravity of the painted part is between 8 and 20 g.
By adopting the technical scheme, if the gravity of the painted part is less than 8g, the painted part can be tightly propped against the baffle by the resistance of the conductor driving the paint to the painted part, so that the friction force between the painted part and the baffle is increased, and the conductor is not favorable for driving the painted part to perform self-aligning; if the weight of the painted part is more than 20g, the resistance of the painted part caused by the paint carried by the conductor to the painted part will be hard to overcome the gravity of the painted part, and the painting function will be hard to realize.
Preferably, the lacquered holes are gradually necked down in the conductor travel direction.
By adopting the technical scheme, the width of the painting hole close to the wire inlet is large on one hand, so that more paint liquid can be accommodated in the painting hole; on the other hand, the painted hole gradually reduces the opening to enable the paint liquid to flow more uniformly, so that the generation of air bubbles in the paint liquid is reduced, and the improvement of the painting quality is facilitated.
Preferably, the painting part comprises a mold core, a pressing part and a containing part, wherein one end of the containing part is provided with a containing groove, the other end of the containing part is provided with a yielding hole which is concentric with the containing groove, and a blocking shoulder is formed between the yielding hole and the containing groove; the mold core is positioned in the accommodating groove, the pressing piece is inserted into the accommodating groove from one end far away from the abdicating hole and is matched with the accommodating groove, and the mold core is positioned between the pressing piece and the retaining shoulder; the pressing piece is provided with a through hole parallel to the center line of the accommodating groove, and the mold core is provided with an enamel coating hole parallel to the center line of the accommodating groove; the conductor sequentially passes through the through hole, the paint coating hole and the abdicating hole along the advancing direction.
Through adopting above-mentioned technical scheme, what the painting adopted is split type, and main painting part is the mold core, assembles after making each part alone, can reduce the processing degree of difficulty and the processing cost of painting.
Preferably, one end of the mold core, which is far away from the abdicating hole, is further provided with an accommodating hole, and the diameter of the cross section of the accommodating hole is larger than that of the paint coating hole.
Through adopting above-mentioned technical scheme, the appearance hole can be stored the lacquer liquid, and the more lacquer liquid of holding is favorable to promoting the japanning effect.
Preferably, the paint coating hole is a flat hole, the length of the wide side of the flat hole is 0.4-3.0 mm, the length of the long side of the flat hole is 1.0-6.5 mm, and the cross-sectional area of the paint coating hole is 0.8-15 square mm.
Preferably, the sectional shapes of the paint coating hole and the containing hole are the same as the sectional profile of the conductor, and the containing hole is gradually reduced along the advancing direction of the conductor.
Through adopting above-mentioned technical scheme, the gradual throat of containing hole can let the lacquer liquid mobile more even, reduces the production of bubble in the lacquer liquid, is favorable to improving the quality of japanning.
Preferably, the through-hole is tapered in a traveling direction of the conductor.
Through adopting above-mentioned technical scheme, the through-hole throat gradually can let the lacquer liquid mobile more even, reduces the production of bubble in the lacquer liquid, is favorable to improving the quality of japanning.
Preferably, the contour of the through hole near one end of the mold core is aligned with the contour of the containing hole near one end of the pressing piece.
Through adopting above-mentioned technical scheme, can seamless butt joint between through-hole and the containing hole, increase the homogeneity that lacquer liquid flows, reduce the production of the interior bubble of lacquer liquid.
In summary, the present invention has the following technical effects:
1. by arranging the painting part on one side of the baffle plate, which is far away from the advancing direction of the conductor, the effect of increasing the allowable offset of the conductor is achieved;
2. the painted part is divided into separate parts, so that the processing difficulty and the processing cost are reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art enamelling die;
FIG. 2 is a schematic cross-sectional structural view of a painted part in the prior art;
FIG. 3 is a schematic view of the construction of the enamelling die according to the invention;
FIG. 4 is an enlarged view of FIG. 3 taken at detail A;
FIG. 5 is a schematic sectional view of a painted part in the present invention.
In the figure, 1, a baffle; 11. mounting grooves; 12. an adjustment hole; 2. a paint box; 3. painting the part; 31. painting holes; 32. a mold core; 321. coating paint holes; 322. a containment hole; 33. a compression member; 331. a through hole; 34. a housing member; 341. a containing groove; 342. a hole of abdication; 343. a shoulder block; 39. a clamping groove; 4. a conductor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that, as used in the following description, the terms "front," "rear," "left," "right," "upper," "lower," "bottom" and "top" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 3 and 4, a self-centering enamelling die for an electromagnetic wire is used for enamelling a conductor 4, and comprises a baffle plate 1, an enamelling box 2 and an enamelling piece 3, wherein the enamelling piece 3 is provided with enamelling holes 31 along an axis parallel to the conductor 4, the conductor 4 passes through the enamelling holes 31 and the baffle plate 1, the enamelling piece 3 is positioned on one side of the baffle plate 1 departing from the advancing direction of the conductor 4, and the baffle plate 1 is provided with adjusting holes 12 for the conductor 4 to pass through. The conductor 4 firstly passes through the paint box 2, so that the outer surface of the conductor 4 is coated with a large amount of paint liquid, and then passes through the painting hole 31 of the painting member 3, so that the paint liquid is uniformly coated on the outer surface of the conductor 4 under the action of the painting hole 31; meanwhile, when the conductor 4 deviates, the conductor 4 can automatically push the painted part 3 to move through the paint liquid by the resistance of the paint liquid between the conductor 4 and the painted hole 31 so as to achieve the purpose that the conductor 4 is concentric with the painted hole 31, thereby realizing the self-alignment of the conductor 4 and the painted part 3, and the deviation amount which can allow the conductor 4 to deviate at the moment is the distance between the adjusting hole 12 and the conductor 4.
To ensure that the coating thickness of the lacquer liquid is the same on the outer circumference of the conductor 4, the end of the lacquered hole 31 at the outlet line must have the same cross-sectional profile as the cross-sectional profile of the conductor 4, wherein the cross-sectional dimension of the lacquered hole 31 should be larger than the cross-sectional dimension of the conductor 4.
In the present embodiment, as shown in fig. 4, the adjusting hole 12 is the mounting groove 11 in the background art, but may be provided in other forms, which greatly increases the allowable offset of the conductor 4 compared to the background art when the same baffle plate 1 is used. The size of the end of the painting member 3 close to the baffle plate 1 is larger than that of the adjusting hole 12, so that the painting member 3 can only abut against one side of the baffle plate 1 and cannot be clamped in the adjusting hole 12.
In addition, the self-center enameled die of the electromagnetic wire is generally used under the condition that the conductor 4 moves vertically upwards, so that the gravity of the enameled piece 3 is completely overcome by the resistance of the paint liquid driven by the conductor 4 to the enameled piece 3, and the enameled piece 3 is in a suspended state or is abutted to the baffle 1; compared with other travel tracks of the conductor 4, when the conductor 4 moves vertically upwards, the painted part 3 is not influenced by self gravity in the direction perpendicular to the moving direction of the conductor 4, the self-aligning effect of the painted part 3 is most obvious, and the painted layer on the outer surface of the conductor 4 is more uniform.
The conductor 4 is typically a round wire or a flat wire, but may also be a shaped wire. The painting member 3 is generally cylindrical in shape, although other regular shapes are possible, but the centre line of the painting aperture 31 must coincide with the vertical line of the centre of gravity of the painting member 3.
Of course, the gravity of the painted part 3 cannot be too large or too small, and is generally controlled to be between 8 and 20 g. If the gravity of the painted part 3 is too small, the painted part 3 is tightly propped against the baffle 1 by the resistance of the paint driven by the conductor 4 to the painted part 3, so that the friction force between the painted part 3 and the baffle 1 is increased, and the conductor 4 is not favorable for driving the painted part 3 to perform self-aligning; if the weight of the painted part 3 is too large, the resistance of the painted part 3 by the paint carried by the conductor 4 will be difficult to overcome the weight of the painted part 3, and it will be difficult to perform the painting function.
As shown in fig. 5, the painting hole 31 is gradually narrowed in the direction in which the conductor 4 travels. Therefore, on one hand, the width of the painting hole 31 close to the wire inlet is large, which is beneficial to containing more paint liquid in the painting hole 31; on the other hand, the gradual necking of the painting hole 31 can make the paint liquid flow more uniformly, reduce the generation of air bubbles in the paint liquid, and is favorable for improving the painting quality.
The painting part 3 can adopt an integrated structure and a split structure, and after the split structure is adopted, all parts are processed respectively and then assembled, so that the processing difficulty can be greatly reduced, and the processing cost can be reduced. The following is a description of the structure of the painted part 3 of split type.
As shown in fig. 5, the painting member 3 includes a mold core 32, a pressing member 33 and a receiving member 34, one end of the receiving member 34 is provided with a receiving groove 341, the other end of the receiving member 34 is provided with a yielding hole 342 having the same center line as the receiving groove 341, and a retaining shoulder 343 is formed between the yielding hole 342 and the receiving groove 341; the mold core 32 is located in the receiving groove 341, the pressing piece 33 is inserted into the receiving groove 341 from one end away from the receding hole 342 and is matched with the receiving groove 341, and the mold core 32 is located between the pressing piece 33 and the retaining shoulder 343; the pressing piece 33 is provided with a through hole 331 parallel to the center line of the accommodating groove 341, and the mold core 32 is provided with an enamel coating hole 321 parallel to the center line of the accommodating groove 341; the conductor 4 passes through the through hole 331, the enamel coating hole 321 and the relief hole 342 in sequence in the traveling direction, that is, the through hole 331, the enamel coating hole 321 and the relief hole 342 are integrally formed as the enamel coating hole 31.
The mold core 32 is made of YG8 tungsten steel, the price is high, the processing difficulty is high, only the mold core 32 needs to be processed independently after the split structure is adopted, and the material cost and the processing difficulty of processing are saved. The mold core 32 may be directly placed in the receiving groove 341, or may be screwed into the receiving groove 341. The pressing member 33 is generally screwed into the receiving groove 341, but may be inserted into the receiving groove.
When the conductor 4 is a flat wire, the enameled hole 321 is an oblong hole, and the sizes of the long side and the wide side of the enameled hole 321 are limited, so that the enameled hole is suitable for the conductor 4 with the existing specification, and the enameled hole 321 can be prevented from exceeding the abdicating hole 342. Therefore, the length of the wide side of the paint coating hole is between 0.4mm and 3.0mm, the length of the long side of the paint coating hole is between 1.0mm and 6.5mm, and the cross section area of the paint coating hole is between 0.8 square millimeter and 15 square millimeter.
As shown in fig. 5. The mold core 32 is kept away from the one end of the abdicating hole 342 and is also provided with an accommodation hole 322, the section diameter of the accommodation hole 322 is larger than that of the paint-coating hole 321, so that the accommodation hole 322 can store paint liquid, hold more paint liquid and be beneficial to improving the painting effect. The cross-sectional profile and size of the enamel coating hole 321 are preferably constant, i.e. the enamel coating hole 321 is a straight hole, so that when the conductor 4 passes through the enamel coating hole 321, the fluidity of the enamel liquid between the conductor 4 and the enamel coating hole 321 is more stable, and the enamel liquid can be coated on the outer surface of the conductor 4 more uniformly. If the distance between the painting holes 321 is too short or the painting holes 321 are tapered holes, the fluidity of the paint in the painting holes 321 is relatively poor, and the uniformity of coating is reduced.
The sectional shapes of the enamel coating hole 321 and the containing hole 322 are preferably the same as the sectional profile of the conductor 4, and the containing hole 322 is gradually narrowed in the traveling direction of the conductor 4. The gradual necking of the containing hole 322 can enable the paint liquid to flow more uniformly, reduce the generation of air bubbles in the paint liquid and be beneficial to improving the painting quality.
Also, as shown in fig. 5, the through hole 331 may be provided so as to be gradually tapered in the traveling direction of the conductor 4; furthermore, the contour of the through hole 331 near the end of the mold core 32 is aligned with the contour of the containing hole 322 near the end of the pressing member 33, so that the flowing of the paint liquid is more uniform, the generation of air bubbles in the paint liquid is reduced, and the quality of painting is improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides an electromagnetic wire from center alclad mould, a carry out the japanning to conductor (4), including baffle (1), paint box (2) and japanning piece (3), japanning hole (31) have been seted up along the axis that is on a parallel with conductor (4) in japanning piece (3), the tip cross section profile shape of japanning hole (31) department of being qualified for the next round of competitions is the same with the cross section profile shape of conductor (4), conductor (4) pass japanning hole (31) and baffle (1), a serial communication port, japanning piece (3) are unsettled to be set up in one side that deviates from conductor (4) advancing direction in baffle (1), set up regulation hole (12) that supply conductor (4) to pass on baffle (1), the motion trail of conductor (4) is upwards for following vertical direction.
2. A self-centering enamelling die for electromagnetic wires according to claim 1, characterised in that the weight of the enamelled product (3) is between 8 and 20 g.
3. A self-centering enamelling die for electromagnetic wires according to any of claims 1-2, characterised in that the enamelling holes (31) are tapered in the direction of travel of the conductor (4).
4. The self-centering enamelling die for the electromagnetic wire according to any one of claims 1 to 2, characterized in that the enamelling piece (3) includes a die core (32), a pressing piece (33) and a receiving piece (34), one end of the receiving piece (34) is provided with a receiving groove (341), the other end of the receiving piece (34) is provided with a yielding hole (342) having the same center line as the receiving groove (341), and a retaining shoulder (343) is formed between the yielding hole (342) and the receiving groove (341); the mold core (32) is positioned in the containing groove (341), the pressing piece (33) is inserted into the containing groove (341) from one end far away from the abdicating hole (342) and is matched with the containing groove (341), and the mold core (32) is positioned between the pressing piece (33) and the retaining shoulder (343); the pressing piece (33) is provided with a through hole (331) parallel to the center line of the containing groove (341), and the mold core (32) is provided with a paint coating hole (321) parallel to the center line of the containing groove (341); the conductor (4) sequentially passes through the through hole (331), the enameled hole (321) and the abdication hole (342) along the advancing direction.
5. The self-centering enamelling die for the magnet wire according to claim 4, characterized in that an accommodating hole (322) is further formed in one end of the die core (32) away from the abdicating hole (342), and the cross-sectional diameter of the accommodating hole (322) is larger than that of the enamelling hole (321).
6. The self-centering enamelling die for electromagnetic wires according to claim 4, characterized in that the enamelling holes (321) are flat holes with a wide side of 0.4mm to 3.0mm and a long side of 1.0mm to 6.5mm, the cross-sectional area of the enamelling hole (321) being between 0.8 mm and 15 mm.
7. A self-centering enamelling die for electromagnetic wires according to claim 5, characterised in that the cross-sectional shape of the enamelling holes (321) and of the containment holes (322) is identical to the cross-sectional profile of the conductor (4), and in that the containment holes (322) are tapered in the direction of travel of the conductor (4).
8. A self-centering enamelling die for electromagnetic wires according to claim 7, characterised in that the through-holes (331) are tapered in the direction of travel of the conductor (4).
9. A self-centering enamelling die for electromagnetic wires according to claim 8, characterised in that the contour of the through-hole (331) near the end of the core (32) is aligned with the contour of the receiving-hole (322) near the end of the pressing member (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810976460.6A CN109273174B (en) | 2018-08-25 | 2018-08-25 | Self-center enameled mold for electromagnetic wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810976460.6A CN109273174B (en) | 2018-08-25 | 2018-08-25 | Self-center enameled mold for electromagnetic wire |
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| CN109273174A CN109273174A (en) | 2019-01-25 |
| CN109273174B true CN109273174B (en) | 2020-01-17 |
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| CN201810976460.6A Active CN109273174B (en) | 2018-08-25 | 2018-08-25 | Self-center enameled mold for electromagnetic wire |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112289516B (en) * | 2020-11-03 | 2022-02-22 | 保定天威线材制造有限公司 | Painting device and method for enameled wire |
| CN113130143B (en) * | 2021-04-07 | 2023-03-28 | 铜陵精迅特种漆包线有限责任公司 | Floated painting system is used to vertical enamelling machine |
| CN114496417A (en) * | 2022-02-28 | 2022-05-13 | 先登高科电气有限公司 | Painting process of enameled wire and vertical suspension mold |
| CN114496418B (en) * | 2022-03-10 | 2022-11-15 | 天津精达里亚特种漆包线有限公司 | Self-calibration flat enameled wire enamel-covered mold and using method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201082405Y (en) * | 2007-08-22 | 2008-07-09 | 佛山市威奇电工材料有限公司 | Changing type paint coating mould |
| CN201549277U (en) * | 2009-11-27 | 2010-08-11 | 常州市正和电磁线有限公司 | Self-aligning device for paint-coated mould |
| CN101913089B (en) * | 2010-07-07 | 2012-05-30 | 铜陵精远线模有限责任公司 | Painting mold fixture capable of facilitating centering |
| CN104200932A (en) * | 2014-09-19 | 2014-12-10 | 河南华洋铜业集团有限公司 | Painting device and mold adjusting base thereof |
| CN108074685A (en) * | 2016-11-15 | 2018-05-25 | 扬州丰铜业有限公司 | A kind of mold painting apparatus for suffering from one's own actions centralized positioning |
| CN107958751B (en) * | 2017-11-14 | 2023-05-12 | 保定天威线材制造有限公司 | Paint mold frame capable of transversely and longitudinally moving and application method thereof |
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Address after: 300300 Siwei Road, economic development zone, Dongli District, Tianjin Patentee after: Tianjin Jingda Enamelled Wire Co.,Ltd. Address before: 300300 Siwei Road, economic development zone, Dongli District, Tianjin Patentee before: TIANJIN JINGDA REA SPECIAL ENAMELLED WIRE Co.,Ltd. |