CN211778555U - Four-freedom-degree heteropolar multi-sheet structure magnetic bearing - Google Patents
Four-freedom-degree heteropolar multi-sheet structure magnetic bearing Download PDFInfo
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- CN211778555U CN211778555U CN202020106085.2U CN202020106085U CN211778555U CN 211778555 U CN211778555 U CN 211778555U CN 202020106085 U CN202020106085 U CN 202020106085U CN 211778555 U CN211778555 U CN 211778555U
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Abstract
The utility model discloses a four-degree-of-freedom heteropolarity multi-disc structure magnetic bearing, which comprises a stator and a rotor. The stator is in an axially symmetrical structure and consists of a left X stator core, a left Y stator core, a right X stator core and a right Y stator core; the rotor comprises a left rotor iron core, a right rotor iron core and a rotating shaft. The left and right X stator cores, the left and right Y stator cores are respectively connected through a pair of connectors into which the permanent magnets are inserted. The left and right X stator iron cores, the left and right Y stator iron cores are uniformly distributed with a pair of suspension teeth along the inner circumference, the suspension teeth are of a zigzag structure and are wound with a centralized radial control winding, the suspension teeth on the left and right sides are coplanar with the vertical parts of the left and right rotor iron cores, and radial air gaps with the same length are formed between the suspension teeth and the left and right rotor iron cores. The utility model discloses X and Y direction suspension independent design realize that the suspension power does not have the coupling in X-Y direction, and control is simple, and the permanent magnet is located the axial, does not occupy radial space, and radial suspension power is big.
Description
Technical Field
The utility model relates to a non-mechanical contact magnetic bearing, in particular to a magnetic bearing with four-degree-of-freedom heteropolarity multi-disc structure, which can be used as a non-contact suspension support of high-speed transmission parts such as a flywheel system, a machine tool electric spindle, a centrifugal machine and the like.
Background
The magnetic bearing is a novel high-performance bearing which suspends a rotor in a space by utilizing electromagnetic force between a stator and the rotor so that the stator and the rotor are not in mechanical contact. With the emergence of rare earth permanent magnetic materials with high magnetic energy product, in order to fully utilize the magnetic energy provided by the permanent magnetic materials, a permanent magnetic bias magnetic bearing is provided, only control current is needed in an excitation winding of the magnetic bearing, bias current is not needed, and the loss of the magnetic bearing and the power consumption of a power amplifier circuit can be obviously reduced. Currently, a permanent magnet biased magnetic bearing is classified into homopolar and heteropolar magnetic bearings according to the difference of magnetic poles formed by a bias magnetic flux on a stator magnetic pole: (1) the magnetic bearing with the same polarity, the magnetic polarities of the permanent magnets generated on the stator magnetic poles are the same, and the circulating paths of the bias magnetic flux and the control magnetic flux are not on the same plane; (2) the magnetic bearing with different polarities, the permanent magnets on the magnetic poles have different magnetic polarities and are alternately arranged, and the bias magnetic flux and the control magnetic flux flow on the same plane. The heteropolar magnetic bearing is formed by the structure of the active magnetic bearing and the high magnetic energy product of the rare earth permanent magnet material, and has the advantages of small magnetic leakage of the active magnetic bearing and low power consumption of the permanent magnet bias magnetic bearing.
The structural commonality of the existing heteropolarity magnetic bearing is a monolithic structural design that all radial suspension teeth are on the same plane, and the radial suspension teeth wind a control winding to generate radial control magnetic flux which interacts with corresponding bias magnetic flux to generate radial suspension force. The radial two-degree-of-freedom suspension of the hybrid magnetic bearing with the structure is realized in a single chip, so that the suspension force is coupled in the X-Y direction, and the control is complex.
Disclosure of Invention
The utility model aims at providing a can simplify control, compact structure makes and convenient assembling's four degrees of freedom heteropolarity multi-disc structure magnetic bearing, adopts the multi-disc structure, and the suspension of two directions of X-Y is realized by independent stator core respectively, and the suspension power does not have the coupling in X-Y direction, and control is simple.
The utility model discloses a following technical scheme realizes:
a magnetic bearing with four-degree-of-freedom heteropolarity multi-sheet structure comprises a stator and a rotor positioned at the inner ring of the stator, wherein the stator is of an axial symmetrical structure and consists of a left X stator core, a left Y stator core, 4 permanent magnets, a right X stator core and a right Y stator core which are sequentially arranged from left to right; the rotor comprises a left rotor iron core, a right rotor iron core and a rotating shaft, and the rotating shaft penetrates through the left rotor iron core, the right rotor iron core, the left X stator iron core, the left Y stator iron core, the right X stator iron core and the right Y stator iron core;
the left and right X stator cores are connected through a pair of connectors respectively, and the left and right Y stator cores are connected through another pair of connectors respectively; permanent magnets are inserted into the connectors, the permanent magnets are axially magnetized, and the magnetization direction of the permanent magnets on the connectors for connecting the left and right X stator cores is opposite to that of the permanent magnets on the connectors for connecting the left and right Y stator cores; a pair of suspension teeth are uniformly distributed at symmetrical positions of the left X stator core along the + X axis and the-X axis of the inner circumference; a pair of suspension teeth are uniformly distributed at symmetrical positions of the left Y stator core along the + Y axis and the-Y axis of the inner circumference; the right X stator core and the right Y stator core are provided with the same suspension teeth at the symmetrical positions with the left X stator core and the left Y stator core;
the suspension teeth are of a zigzag structure, and four suspension teeth on the left X stator iron core and the left Y stator iron core are close to one end face of the left rotor iron core and are matched with the circumferential surface of the left rotor iron core in radian, have the same axial width as the left rotor iron core and are opposite to the left rotor iron core in position; four suspension teeth on the right X stator iron core and the right Y stator iron core are matched with the circumferential surface of the right rotor iron core in radian close to one end surface of the right rotor iron core and are the same as the right rotor iron core in axial width and opposite to the right rotor iron core in position; radial air gaps with the same length as the radial air gaps are formed between the suspension teeth and the left rotor iron core and between the suspension teeth and the right rotor iron core, and centralized radial control windings are wound on the suspension teeth.
Furthermore, the outer diameters of the left Y stator core and the right Y stator core are smaller than the inner diameters of the left X stator core and the right X stator core, and the difference between the outer diameters and the inner diameters is larger than the length of two radial air gaps.
Furthermore, 4 connectors are all arc-shaped, the radial sizes of the connectors are the same, the connectors are respectively located on a ring with the outer diameter being the same as that of the left and right X stator cores, the two ends of the inner surface, close to the circle center, of a pair of connectors for connecting the left and right Y stator cores are respectively provided with a terminating part, and the left Y stator core is connected with the right Y stator core through 4 terminating parts.
Further, the left and right X stator cores, the left and right Y stator cores, the 4 connectors, the 4 end connection parts, and the left and right rotor cores are all made of magnetic conductive materials.
Further, the four permanent magnets are made of rare earth permanent magnet materials.
Further, the rotating shaft is made of a non-magnetic conductive material.
Has the advantages that:
1. the utility model provides a four degrees of freedom heteropolarity multi-disc structure magnetic bearing structures adopts the multi-disc formula structure, and the suspension of two directions of X-Y is realized by independent stator core respectively, will suspend the tooth and design into zigzag type structure, makes the suspension tooth and the rotor core coplane of X direction and Y direction, and the suspension power does not have the coupling in X-Y direction, and control is simple.
2. The utility model discloses a guarantee that 4 permanent magnet sizes are the same, be fixed with the termination part at the connector both ends that are used for connecting the less left Y stator core of external diameter and right Y stator core, connect both through the termination part, can guarantee like this that these two connectors are the same with the radial dimension of other two connectors that are used for connecting left X stator core, right X stator core, just so can guarantee that the size of 4 permanent magnets is the same.
Drawings
FIG. 1 is a structural diagram of a magnetic bearing with four degrees of freedom and heteropolarity multi-disc structure;
FIG. 2 is a transverse cross-sectional view of the left and right X stator cores of the magnetic bearing with four-degree-of-freedom heteropolar multi-disc structure of the present invention;
fig. 3 is a suspension magnetic flux diagram of a magnetic bearing with four degrees of freedom and heteropolarity multi-disc structure according to the present invention.
1-left X stator core, 101-suspended teeth Al102-suspended tooth Bl2-left Y stator core, 201-floating tooth Cl202-suspended tooth Dl3-right Y stator core, 301-floating tooth Cr302-suspended tooth Dr4-Right X stator core, 401-suspended tooth Ar402-suspended tooth Br5-permanent magnet Ex6-permanent magnet Fx7-permanent magnet Ey8-permanent magnet Fy9-first connecting body, 10-second connecting body, 11-third connecting body, 12-fourth connecting body, 13-first terminal part, 14-second terminal part, 15-third terminal part, 16-fourth terminal part, 17-radial control winding, 18-left rotor iron core, 19-right rotor iron core, 20-rotating shaft, 21-radial air gap, 22-static bias magnetic flux, 23-X direction radial control magnetic flux and 24-Y direction radial control magnetic flux.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The specific structure is shown in fig. 1-3, the utility model discloses a four-degree-of-freedom heteropolarity multi-disc structure magnetic bearing, including the stator and the rotor that is located the stator inner circle.
The stator is of an axially symmetrical structure and comprises a left X stator core 1, a left Y stator core 2, a right X stator core 4 and a right Y stator core 3 which are sequentially arranged from left to right. The rotor includes a left rotor core 18, a right rotor core 19, and a rotation shaft 20. The magnetic bearing also comprises four permanent magnets (5 is a permanent magnet E)x6 is a permanent magnet FxAnd 7 is a permanent magnet EyAnd 8 is a permanent magnet Fy) All of which are sheet magnets with radian, see the attached figure 1. 4 permanent magnets are equally inserted into a connecting body respectively, the permanent magnets are vertically arranged in the middle of the connecting body, the sizes of the 4 permanent magnets are the same, the 4 connecting bodies are arc-shaped, the radial sizes of the connecting bodies are the same, and the axial sizes of the connecting bodies are the sameIn contrast, the third connecting body 11 and the fourth connecting body 12 have axial lengths shorter than those of the first connecting body 9 and the second connecting body 10, and are respectively located on cylindrical rings having the same outer diameters as those of the left X stator core 1 and the right X stator core 4. 4 permanent magnets (permanent magnet E)x5, permanent magnet F x6 permanent magnet E y7, permanent magnet Fy8) Is axially magnetized, and a permanent magnet E x5. Permanent magnet F x6 direction of magnetization and permanent magnet E y7. Permanent magnet Fy8 is reversed.
Left side X stator core 1 and right X stator core 4 link to each other through first connector 9 and second connector 10, and the both ends of first connector 9 and second connector 10 are all fixed on left X stator core 1 and right X stator core 4, and first connector 9 and second connector 10 are just to setting up, and the arc thickness of 4 connectors is the same with left X stator core 1, right X stator core 4, left Y stator core 2 and right Y stator core's ring thickness.
The third connector 11 and the fourth connector 12 are located at upper and lower positions and are arranged opposite to each other, because the left Y stator core 2 and the right Y stator core 3 have the same size, the left X stator core 1 and the right X stator core 4 have the same size, and the outer diameters of the left and right Y stator cores are smaller than the inner diameters of the left and right X stator cores, in order to ensure that the sizes of the 4 permanent magnets are the same, the sizes of the 4 connectors are required to be the same, then the 4 connectors are required to be located on the same ring and have the same size, in this way, the left Y stator core 2 and the right Y stator core 3 cannot be connected through the third connector 11 and the fourth connector 12, in order to solve the problem, two end connecting parts are added at the two ends of the third connector 11 and the fourth connector 12, see fig. 1, two end connecting parts are fixed at the two ends of the third connector 11 and are respectively a first end connecting part 13, Two end joints, namely a third end joint 15 and a fourth end joint 16, are fixed at two ends of a second end joint 14 and a fourth connector 12, and 4 end joints are of arc-shaped sheet structures, and the radian of the end joints is the same as that of the connectors. Which is fixed to the inner surfaces of the third and fourth connection bodies 11 and 12 such that the left Y stator core 2 and the right Y stator core 3 are connected by 4 terminal parts.
The left X stator core 1 is evenly distributed with suspending teeth A along the inner circumference l101 and floating teeth B l102, the right X stator core 4 evenly distributes suspension teeth A along the inner circumference r401 and floating teeth B r402 aligned with the + x-axis and-x-axis directions, respectively, i.e. floating teeth Al101 and floating teeth B l102 the connection line of the two passes through the center of the circular ring and the suspension teeth Ar401. Suspension tooth B r402 are arranged at the floating teeth Al101. Suspension tooth B l102, corresponding to the location.
The left Y-shaped stator core 2 is uniformly provided with suspending teeth C along the inner circumference l201 and floating teeth D l202, the right Y stator core 3 is provided with suspending teeth C uniformly distributed along the inner circumference r301 and floating teeth Dr302 aligned with the + y-axis and-y-axis directions, respectively, i.e. floating teeth C l201 and floating teeth D l202 the connection line of the two passes through the center of the circular ring and the suspending teeth C l201 and floating teeth D l202 the connecting line of the two is vertical to the floating tooth Al101 and floating teeth B l102 are connected. Suspending tooth C r301. Suspension tooth Dr302 is arranged at the floating teeth C l201. Suspension tooth D l202 corresponding to the location.
The 8 suspension teeth are all zigzag structures, and four suspension teeth (A) on the left X stator core 1 and the left Y stator core 2l、Bl、Cl、Dl) The radian of one end surface close to the left rotor core 18 is matched with the radian of the circumferential surface of the left rotor core 18, the end surface is the same as the axial width of the left rotor core 18 and is opposite to the position, and four suspension teeth (A) are arranged on the right X stator core 3 and the right Y stator core 4r、Br、Cr、Dr) The radian of one end surface close to the right rotor iron core is matched with the radian of the circumferential surface of the right rotor iron core 19, the end surface is the same as the axial width of the right rotor iron core 19 and is opposite to the position, the sizes of the left rotor iron core 18 and the right rotor iron core 19 are the same, so the radian of the cambered surface of one end of each of the 8 suspension teeth close to the rotor iron core is the same as the radian of the circumferential surface of the rotor iron core, and the reference is made to the attached figure 2.
Left 4 floating teeth (floating teeth A)l101. Suspension tooth B l102. Suspending tooth C l201. Suspension tooth Dl202) And left side4 suspension teeth (suspension teeth A) between and on the right side of rotor core 18r301. Suspension tooth Br302. Suspending tooth C r401. Suspension tooth Dr402) Radial air gaps 21 are formed between the rotor core and the right rotor core 19, and the lengths of the formed radial air gaps 21 are equal. The outer diameters of the left and right Y stator cores (2, 3) are smaller than the inner diameters of the left and right X stator cores (1, 4), and the difference between the two is larger than the length of two radial air gaps 21. Each suspension tooth (suspension tooth A)l101. Suspension tooth B l102. Suspending tooth C l201. Suspension tooth D l202. Suspension tooth A r301. Suspension tooth Br302. Suspending tooth C r401. Suspension tooth Dr402) A centralized radial control winding 17 is wound on the upper side.
In this embodiment, the left X stator core 1, the right X stator core 4, the left Y stator core 2, the right Y stator core 3, and 4 connectors (the first connector 9, the second connector 10, the third connector 11, and the fourth connector 12), 4 termination parts (the first termination part 13, the second termination part 14, the third termination part 15, and the fourth termination part 16), the left rotor core 18, and the right rotor core 19 are all made of a magnetic conductive material. Four permanent magnets (permanent magnet E)x5, permanent magnet F x6 permanent magnet E y7, permanent magnet Fy8) Is made of rare earth permanent magnetic material. The shaft 20 is a non-magnetic conductive material.
4 permanent magnets (permanent magnet E)x5, permanent magnet F x6 permanent magnet E y7, permanent magnet Fy8) The static bias flux 22 generated, see fig. 3, is derived from the permanent magnet E y7. Permanent magnet FyStarting from 8N poles, the three-phase magnetic suspension device passes through a third connecting body 11, a fourth connecting body 12, a first connecting part 13, a third connecting part 15 and a suspension tooth C l201. Suspension tooth D l202, left rotor core 18, floating teeth al101. Suspension tooth B l102, first connecting body 9, second connecting body 10, back to permanent magnet E x5. Permanent magnet Fx6S pole; permanent magnet E x5. Permanent magnet FxStarting from 6N pole, the suspension teeth A pass through a first connecting body 9 and a second connecting body 10r401. Suspension tooth B r402, right rotor ironCore 19, floating teeth C r301. Suspension tooth Dr302, second termination 14, fourth termination 16, third connection body 11, fourth connection body 12, back to permanent magnet E y7, permanent magnet FyAnd 8, S pole.
Wound on the suspension teeth A l101. Suspension tooth B l102, floating tooth A r401. Suspension tooth BrThe X-direction radial control magnetic flux 23 generated by the radial control winding 17 of 402 passes through the yoke parts of the left X stator core 1 and the right X stator core 4 and the floating teeth a on the left X stator core 1 and the right X stator core 4, respectivelyl101. Suspension tooth B l102, floating tooth A r401. Suspension tooth B r402 and the left and right rotor cores (18, 19) form a closed circuit. Wound on the suspension teeth C l201. Suspension tooth D l202. Suspending tooth C r301. Suspension tooth DrThe radial control magnetic flux 24 in the Y direction generated by the radial control winding on the 302 passes through the yoke parts of the left Y stator core 2 and the right Y stator core 3 and the suspension teeth C on the left Y stator core 2 and the right Y stator core 3 respectivelyl201. Suspension tooth D l202. Suspending tooth C r301. Suspension tooth Dr302 and the left and right rotor cores 18 and 19 form a closed loop.
Suspension principle: by the interaction of the static bias magnetic flux 22 and the radial control magnetic flux (X-direction radial control magnetic flux 23 and Y-direction radial control magnetic flux 24), the air-gap magnetic field on the same side with the radial eccentric direction of the rotor is weakened in a superimposed manner, and the air-gap magnetic field on the opposite side is strengthened in a superimposed manner, so that a force opposite to the offset direction of the rotor is generated on the rotor, and the rotor is pulled back to the radial balance position.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (6)
1. A magnetic bearing with four degrees of freedom and heteropolarity and multi-sheet structure comprises a stator and a rotor positioned in the inner ring of the stator, and is characterized in that the stator is of an axial symmetrical structure and comprises a left X stator core, a left Y stator core, a right X stator core and a right Y stator core which are sequentially arranged from left to right; the rotor comprises a left rotor iron core, a right rotor iron core and a rotating shaft, and the rotating shaft penetrates through the left rotor iron core, the right rotor iron core, the left X stator iron core, the left Y stator iron core, the right X stator iron core and the right Y stator iron core;
the left and right X stator cores are connected through a pair of connectors respectively, and the left and right Y stator cores are connected through another pair of connectors respectively; permanent magnets are inserted into the connectors, the permanent magnets are axially magnetized, and the magnetization direction of the permanent magnets on the connectors for connecting the left and right X stator cores is opposite to that of the permanent magnets on the connectors for connecting the left and right Y stator cores; a pair of suspension teeth are uniformly distributed at symmetrical positions of the left X stator core along the + X axis and the-X axis of the inner circumference; a pair of suspension teeth are uniformly distributed at symmetrical positions of the left Y stator core along the + Y axis and the-Y axis of the inner circumference; the right X stator core and the right Y stator core are provided with the same suspension teeth at the symmetrical positions with the left X stator core and the left Y stator core;
the suspension teeth are of a zigzag structure, and four suspension teeth on the left X stator iron core and the left Y stator iron core are close to one end face of the left rotor iron core and are matched with the circumferential surface of the left rotor iron core in radian, have the same axial width as the left rotor iron core and are opposite to the left rotor iron core in position; four suspension teeth on the right X stator iron core and the right Y stator iron core are matched with the circumferential surface of the right rotor iron core in radian close to one end surface of the right rotor iron core and are the same as the right rotor iron core in axial width and opposite to the right rotor iron core in position; radial air gaps with the same length as the radial air gaps are formed between the suspension teeth and the left rotor iron core and between the suspension teeth and the right rotor iron core, and centralized radial control windings are wound on the suspension teeth.
2. The magnetic bearing of claim 1, wherein the outer diameters of the left and right Y stator cores are smaller than the inner diameters of the left and right X stator cores, and the difference between the outer diameters is greater than the length of two radial air gaps.
3. The magnetic bearing of claim 1, wherein the 4 connectors are arc-shaped, have the same radial dimension, and are respectively located on a ring having the same outer diameter as the left and right X stator cores, the two ends of the inner surface of the pair of connectors for connecting the left and right Y stator cores, which is close to the center of the circle, are respectively provided with a terminating portion, and the left Y stator core is connected to the right Y stator core through the 4 terminating portions.
4. The magnetic bearing of claim 3, wherein the left and right X stator cores, the left and right Y stator cores, the 4 connectors, the 4 terminals, and the left and right rotor cores are made of a magnetically conductive material.
5. The magnetic bearing with the four-degree-of-freedom heteropolar multichip structure according to any one of claims 1-4, wherein the four permanent magnets are made of rare earth permanent magnet material.
6. The magnetic bearing with the four-degree-of-freedom heteropolar multichip structure according to any one of claims 1-4, wherein the rotating shaft is made of a non-magnetic conductive material.
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| CN202020106085.2U CN211778555U (en) | 2020-01-17 | 2020-01-17 | Four-freedom-degree heteropolar multi-sheet structure magnetic bearing |
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| CN202020106085.2U CN211778555U (en) | 2020-01-17 | 2020-01-17 | Four-freedom-degree heteropolar multi-sheet structure magnetic bearing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173837A (en) * | 2020-01-17 | 2020-05-19 | 淮阴工学院 | Four-freedom-degree heteropolar multi-sheet structure magnetic bearing |
| CN112412980A (en) * | 2020-11-16 | 2021-02-26 | 饶俊 | Permanent magnet biased radial magnetic bearing |
| CN117489701A (en) * | 2023-09-15 | 2024-02-02 | 淮阴工学院 | Hybrid excitation asymmetric four-degree-of-freedom magnetic bearing and parameter design method thereof |
-
2020
- 2020-01-17 CN CN202020106085.2U patent/CN211778555U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173837A (en) * | 2020-01-17 | 2020-05-19 | 淮阴工学院 | Four-freedom-degree heteropolar multi-sheet structure magnetic bearing |
| CN112412980A (en) * | 2020-11-16 | 2021-02-26 | 饶俊 | Permanent magnet biased radial magnetic bearing |
| CN117489701A (en) * | 2023-09-15 | 2024-02-02 | 淮阴工学院 | Hybrid excitation asymmetric four-degree-of-freedom magnetic bearing and parameter design method thereof |
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Effective date of registration: 20210121 Address after: 214107 No.6 Hengyang Road, Yangjian Town, Xishan District, Wuxi City, Jiangsu Province Patentee after: Wuxi Chuangsi Da Precision Machinery Co.,Ltd. Address before: 223005 Jiangsu Huaian economic and Technological Development Zone, 1 East Road. Patentee before: HUAIYIN INSTITUTE OF TECHNOLOGY |
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