CN109597008B - Shimming tool - Google Patents
Shimming tool Download PDFInfo
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- CN109597008B CN109597008B CN201811613560.9A CN201811613560A CN109597008B CN 109597008 B CN109597008 B CN 109597008B CN 201811613560 A CN201811613560 A CN 201811613560A CN 109597008 B CN109597008 B CN 109597008B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
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- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention discloses a shimming tool, which comprises: a first positioning disk for being supported in the central through hole of the magnet; the rotating shaft is inserted in the first positioning disc and can rotate relative to the first positioning disc; the probe is fixedly connected to the rotating shaft, and the fixed position of the probe on the rotating shaft is adjustable along the radial direction. In the shimming tool, the shimming tool can be reliably supported and positioned by the first positioning disc, the measurement of the magnetic field intensity of all measurement points can be realized by adjusting the installation position of the probe and the rotation of the rotating shaft, the operation is convenient, the structure is simple, and the shimming tool is particularly suitable for the measurement of a magnet with a small caliber.
Description
Technical Field
The invention relates to the technical field of superconducting nuclear magnetic resonance magnet testing, in particular to a shimming tool.
Background
Shimming is the final realization link of the high-uniformity magnetic field of the nuclear magnetic resonance magnet. The shimming process requires support of shimming software and hardware. The software is a shimming optimization algorithm, and the hardware is provided with a shimming tool. The shimming process is as follows: the magnetic field intensity of 24x24 points on the surface of an imaging region is measured by using a shimming tool and a probe in the shimming tool, the surface is a spherical surface, the measured data is input into shimming software, the optimal patch number and the patch space position are optimized, and the inhomogeneity of the imaging region is counteracted through the polarized magnetic field of the patches.
The existing shimming tool is generally a multi-probe measuring instrument-meniscus shimming tool, is generally suitable for large-caliber magnets, and is relatively complex in structure and complex in operation.
Therefore, how to provide a shimming tool with a simple structure and convenient operation is a technical problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of this, the invention aims to provide a shimming tool which is simple in structure and convenient to operate.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a shimming frock, includes:
a first positioning disk for being supported in the central through hole of the magnet;
the rotating shaft is inserted in the first positioning disc and can rotate relative to the first positioning disc;
the probe is fixedly connected to the rotating shaft, and the fixed position of the probe on the rotating shaft is adjustable along the radial direction.
Preferably, the first positioning disc is provided with positioning holes, all the positioning holes are sequentially arranged along a virtual circle taking the rotation center of the rotating shaft as the center, the rotating shaft is fixedly connected with a rotating disc, the rotating disc is slidably inserted with a plug pin, and the plug pin is correspondingly inserted into each positioning hole to limit the rotation angle of the rotating shaft.
Preferably, the axial position of the probe relative to the first puck is adjustable.
Preferably, the connection position of the rotating shaft on the rotating disc is adjustable along the axial direction.
Preferably, the rotating shaft comprises a first fixing shaft and a second fixing shaft fixed on one side of the first fixing shaft in the axial direction, the first fixing shaft is inserted into the first positioning disc, the center line of the first fixing shaft is the rotating center of the rotating shaft, the center line of the second fixing shaft is parallel to the center line of the first fixing shaft, the rotating shaft forms a bending shaft, and the probe is fixed on the second fixing shaft and the fixing position of the probe is adjustable in the radial direction.
Preferably, the probe fixing device further comprises a probe fixing rod, the probe is fixed on the probe fixing rod, the probe fixing rod is fixedly inserted on the second fixing shaft, and the fixing position of the probe fixing rod is adjustable along the radial direction.
Preferably, the second fixing shaft is provided with a locking threaded hole, the locking threaded hole is communicated with an insertion hole of the second fixing shaft, which is inserted with the probe fixing rod, and the locking threaded hole is in threaded connection with a locking screw so as to compress the probe fixing rod.
Preferably, the first positioning disk is further provided with a patch hole for performing a patch to adjust the uniformity of the magnetic field.
Preferably, the positioning device further comprises a second positioning disc used for being matched with the first positioning disc to support, and the second positioning disc is rotatably connected to the rotating shaft.
Preferably, the first positioning disc comprises a first annular plate, a second annular plate parallel to the first annular plate, and a connecting plate connected between the first annular plate and the second annular plate, the positioning hole is formed in the first annular plate, and the patch hole is formed in the second annular plate.
The shimming tool provided by the invention comprises: a first positioning disk for being supported in the central through hole of the magnet; the rotating shaft is inserted in the first positioning disc and can rotate relative to the first positioning disc; the probe is fixedly connected to the rotating shaft, and the fixed position of the probe on the rotating shaft is adjustable along the radial direction.
In the shimming tool, the shimming tool can be reliably supported and positioned by the first positioning disc, the measurement of the magnetic field intensity of all measurement points can be realized by adjusting the installation position of the probe and the rotation of the rotating shaft, the operation is convenient, the structure is simple, and the shimming tool is particularly suitable for the measurement of a magnet with a small caliber.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is an application diagram of a shimming tool provided by the invention;
fig. 2 is a structural diagram of a first positioning disk in the shimming tool provided by the invention.
In fig. 1 and 2:
1-magnet, 2-third fixed shaft, 3-second positioning plate, 4-probe fixed rod, 5-probe, 6-patch hole, 7-bolt, 8-first fixed shaft, 9-rotary plate, 10-first positioning plate, 11-second fixed shaft, 12-positioning hole, 13-middle through hole and 14-locking screw.
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.
The core of the invention is to provide a shimming tool which is simple in structure and convenient to operate.
In the description of the present invention, the axial direction, the circumferential direction, and the radial direction are based on the rotation center of the rotation shaft for convenience of description, and are not to be construed as limiting the present application. Furthermore, the first, second and third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In a specific embodiment of the shimming tool provided by the present invention, please refer to fig. 1 and fig. 2, which includes: a first positioning disk 10, a rotating shaft and a probe 5. The first positioning disk 10 is intended to be supported in a central through hole 13 of the magnet 1. The rotating shaft is inserted into the first positioning disk 10 and can rotate relative to the first positioning disk 10. The probe 5 is fixedly connected to the rotating shaft, and the fixed position of the probe 5 on the rotating shaft is adjustable along the radial direction.
The shimming tool is characterized in that the shimming tool is made of aluminum alloy, epoxy, electrical wood or other materials.
Wherein only one probe may be provided. When the magnetic field intensity measuring device is used, the probe is connected with an analysis device through signals, and the magnetic field intensity measured by the probe is analyzed through the analysis device.
In a specific using method, after the radial position of the probe 5 relative to the rotating shaft is adjusted and the axial position of the probe 5 in the middle through hole 13 is determined, the shimming tool is placed in the middle through hole 13, the first positioning disc 10 is supported in the middle through hole and can be positioned, and the first positioning disc 10 and the magnet 1 are in a relatively fixed state. The rotating shaft is rotated, the probe 5 moves synchronously along with the rotating shaft, the motion track of the probe 5 is on a virtual circle which takes the rotating center of the rotating shaft as the center of circle, and the measurement is carried out on each set measuring point on the virtual circle. After the rotating shaft rotates for a circle, the shimming tool is taken out of the middle through hole 13, the radial position of the probe 5 relative to the rotating shaft is adjusted, the measured axial position is determined again, and then the operations are repeated until the shimming tool measures the magnetic field intensity of the preset number of measuring points on the spherical surface of the imaging area.
Alternatively, the number of measurement points may be 24 × 24, that is, 24 axial positions in the axial direction need to be measured, and in the same axial position, the probe 5 measures 24 points for each rotation of the rotating shaft in the circumferential direction. Wherein, the radial position of the adjusting probe 5 refers to the distance of the adjusting probe 5 relative to the rotation center of the rotating shaft along the radial direction, and the axial position of the adjusting probe 5 refers to the plane perpendicular to the rotation center of the rotating shaft on which the adjusting probe 5 is positioned.
In the shimming tool provided by the embodiment, the shimming tool can be reliably supported and positioned by adopting the first positioning disc 10, the measurement of the magnetic field intensity of all measurement points can be realized by adjusting the installation position of the probe 5 and the rotation of the rotating shaft, the operation is convenient, the structure is simple, and the shimming tool is particularly suitable for the measurement of the magnet 1 with a small diameter.
On the basis of the above embodiment, as shown in fig. 2, the first positioning disk 10 may have a plurality of positioning holes 12, and all the positioning holes 12 may be sequentially arranged along a virtual circle centered on the rotation center of the rotation shaft. The rotating shaft is fixedly connected with a rotating disc 9, a plug pin 7 is inserted on the rotating disc 9 in a sliding mode, and the plug pin 7 is correspondingly inserted in each positioning hole 12 to limit the rotating angle of the rotating shaft.
In fig. 1, after the shimming tool is installed in the middle through hole 13, the pin 7 may extend out of the magnet 1, the first positioning plate 10 is fixedly disposed in the middle through hole 13, and may be fixed by friction with the middle through hole 13, the rotary plate 9 and the first positioning plate 10 form a rotary pair, and the rotary plate 9 may rotate. The rotating shaft can be driven to rotate by pushing the bolt 7 along the circumferential direction, after the bolt 7 rotates to the position of the first positioning hole 12, the bolt 7 slides relative to the rotary table and is inserted into the positioning hole 12, after the probe 5 finishes one measurement, the bolt 7 slides relative to the rotary table and reversely slides and is separated from the first positioning hole, the rotating shaft is continuously driven to rotate, and after the bolt rotates to the position of the second positioning hole 12, the bolt is repeatedly inserted into the second positioning hole 12 until the position determined by the last positioning hole 12 is measured.
In order to make it more obvious for the worker to determine the position of the positioning hole 12, the length of the positioning hole 12 in the radial direction may be larger, and a part of the positioning hole 12 in the radial direction is not covered by the turntable 9. Still alternatively, a mark line may be provided at a position of the edge of the first positioning disk 10 corresponding to the positioning hole 12 to determine the position of the positioning hole 12. Furthermore, one side of the turntable 9, which is located on the radial direction of the bolt 7, can be provided with a hollow hole, when the positioning hole 12 is exposed from the hollow hole, the bolt 7 is axially inserted, and then the bolt 7 can be inserted into one positioning hole 12.
The number and arrangement of the positioning holes 12 can be determined according to actual measurement requirements. For example, 24 positioning holes 12 are arranged at equal intervals in the circumferential direction to position 24 azimuth angles at which the turntable 9 rotates.
The movement of the bolt 7 can be manually driven, and the bolt 7 can also be connected to drivers such as a motor and an air cylinder through a transmission assembly and driven through the drivers.
The sliding direction of the latch 7 with respect to the rotary table 9 is preferably an axial direction.
In this embodiment, the position of the measuring point in the circumferential direction can be accurately determined by the cooperation of the plug pin 7 and the positioning hole 12, the rotating shaft can be kept stable and immovable when the probe 5 is used for measuring, and the operation is convenient, thereby being beneficial to ensuring the measuring precision.
On the basis of any of the above embodiments, the axial position of the probe 5 relative to the first positioning disk 10 is adjustable.
In particular, the position of the connection of the spindle to the turntable 9 is adjustable in the axial direction. In the embodiment, since the connecting position of the rotating shaft relative to the first positioning disk 10 is adjustable along the axial direction, the position of the first positioning disk 10 in the middle through hole 13 can be determined, and the axial position of the probe 5 in the middle through hole 13 can be adjusted by only adjusting the connecting position of the rotating shaft relative to the first positioning disk 10 each time, so that the operation is facilitated.
On the basis of the above embodiment, as shown in fig. 1, the rotating shaft may include the first fixed shaft 8 and the second fixed shaft 11 fixed on one side of the first fixed shaft 8 in the axial direction, which means that the second fixed shaft 11 extends out of the first fixed shaft 8 in the axial direction, and the second fixed shaft 11 and the first fixed shaft 8 may have a partial structure in parallel in the axial direction, or may not include a parallel part at all. The first fixing shaft 8 is inserted into the first positioning plate 10, the center line of the first fixing shaft 8 is the rotation center of the rotating shaft, the center line of the second fixing shaft 11 is parallel to the center line of the first fixing shaft 8, and the rotating shaft forms a bending shaft, wherein a bending structure is formed between the second fixing shaft 11 and the first fixing shaft 8, and the probe 5 is fixed on the second fixing shaft 11 and the fixing position is adjustable along the radial direction.
The first fixing shaft 8 can be fixedly connected to the turntable 9 through a locking sleeve, and can move along the axial direction after the locking sleeve is loosened. In addition, the first stationary shaft 8 may be provided with graduation marks for determining the axial position of the probe 5.
The first fixing shaft 8 and the second fixing shaft 11 may be connected by screws, clamping, integrally formed or in other manners.
In this embodiment, the probe 5 adjusts the radial position on the second fixed shaft 11, and the rotating shaft is set as a bending shaft, so that the probe 5 can be adjusted to the extension line of the center line of the first fixed shaft 8 by adjusting the radial position of the probe 5, and the magnetic field intensity at the intersection point of the spherical surface of the imaging region and the rotating center line can be measured.
Still alternatively, the adjustment of the axial position of the probe 5 in the intermediate through hole 13 may be achieved by adjusting the length of the axially juxtaposed portions of both the first fixed shaft 8 and the second fixed shaft 11.
On the basis of the above embodiment, the shimming tool may further include a probe fixing rod 4, the probe 5 is fixed on the probe fixing rod 4, the probe fixing rod 4 is fixed on the second fixing shaft 11 in an inserting manner, and the fixing position is adjustable in the radial direction.
Optionally, the probe fixing rod 4 is provided with a mounting hole for placing the probe 5, and a threaded hole is formed in the side surface of the mounting hole, and a set screw is matched with the threaded hole to press and fix the probe 5.
In this embodiment, the probe fixing rod 4 is adopted to fix the probe 5 and the second fixing shaft 11, so as to facilitate the installation and position adjustment of the probe 5.
On the basis of the above embodiment, the second fixing shaft 11 may be provided with a locking threaded hole, the locking threaded hole is communicated with the insertion hole of the second fixing shaft 11, into which the probe fixing rod 4 is inserted, and the locking threaded hole is in threaded connection with a locking screw 14 to compress the probe fixing rod 4.
After the locking screw 14 is loosened, the probe fixing lever 4 can be moved in the radial direction. Preferably, the probe-fixing lever 4 may be graduated for determining the radial position of the probe 5.
In this embodiment, the probe fixing rod 4 is clamped by the locking screw 14 and the hole wall of the insertion hole by the radial force of the locking screw 14, so that the fixing is reliable, and the position adjustment of the probe fixing rod 4 is facilitated.
Of course, in other embodiments, the probe fixing rod 4 and the second fixing shaft 11 can be fixed by clamping or other methods.
On the basis of any of the above embodiments, the first positioning plate 10 may further be provided with a patch hole 6 for performing a patch to adjust the uniformity of the magnetic field, so as to provide a supporting point for the patch.
After measuring the magnetic field strength at all measurement points, the analysis device analyzes the measurement results. According to the analysis result, the patch hole 6 can be selected for patch, specifically a steel sheet, to adjust the field intensity in the middle through hole 13 to be a uniform magnetic field. After the surface mounting operation, the field intensity measurement operation of each measurement point is carried out again to judge whether the surface mounting operation is adjusted to be a uniform magnetic field.
On the basis of the above embodiment, the shimming tool may further include a second positioning disk 3 for supporting in cooperation with the first positioning disk 10, and the second positioning disk 3 is rotatably connected to the rotating shaft, so that the stability of the support is improved.
Can set gradually first positioning disk 10 and second positioning disk 3 along the axial in the pivot, support in order to improve the stability of supporting through two positioning disks, in addition, second positioning disk 3 can set up to one or at least two. In fig. 1, for convenience of showing the positional relationship of the components, only a part of the magnet 1 is shown in the axial direction, and in essence, at least a part of each of the first positioning disk 10 and the second positioning disk 3 is located inside the central hole, and may be located at two axial ends of the central through hole 13.
Further, the rotating shaft may further include a third fixing shaft 2 fixedly connected to the second fixing shaft 11, the third fixing shaft 2 is rotatably connected to the second positioning plate 3, the third fixing shaft 2 and the second positioning plate 3 form a rotating pair, and in the middle through hole 13, the third fixing shaft 2 rotates and the second positioning plate 3 is fixed. The centre line of the third stationary shaft 2 and the centre line of the first stationary shaft 8 may preferably be arranged collinearly. The fixing position of the second stationary shaft 11 on the third stationary shaft 2 is adjustable in the axial direction.
In addition, the first, second and third stationary shafts 8, 11 and 2 may be square shafts.
On the basis of any of the above embodiments, the first positioning plate 10 includes a first annular plate, a second annular plate parallel to the first annular plate, and a connecting plate connected between the first annular plate and the second annular plate, the positioning hole 12 is disposed on the first annular plate, and the patch hole 6 is disposed on the second annular plate, which is convenient for processing.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The shimming tool provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a shimming frock, its characterized in that includes:
a first positioning disk (10) for being supported in a central through hole (13) of the magnet (1);
the rotating shaft is inserted into the first positioning disc (10) and can rotate relative to the first positioning disc (10);
the rotating shaft is fixedly connected with a probe (5) fixedly connected to the rotating shaft, the fixed position of the probe (5) on the rotating shaft is adjustable along the radial direction, positioning holes (12) are formed in a first positioning disc (10), all the positioning holes (12) are sequentially arranged along a virtual circle with the rotating center of the rotating shaft as the center, the rotating shaft is fixedly connected with a rotating disc (9), a plug pin (7) is inserted into the rotating disc (9) in a sliding mode, and the plug pin (7) is inserted into the positioning holes (12) correspondingly to limit the rotating angle of the rotating shaft.
2. The shimming tool according to claim 1, characterized in that the axial position of the probe (5) relative to the first positioning disc (10) is adjustable.
3. The shimming tool according to claim 2, characterized in that the connection position of the rotating shaft on the rotating disc (9) is adjustable along the axial direction.
4. The shimming tool according to claim 3, wherein the rotating shaft comprises a first fixing shaft (8) and a second fixing shaft (11) fixed on one side of the first fixing shaft (8) in the axial direction, the first fixing shaft (8) is inserted into the first positioning disc (10), the center line of the first fixing shaft (8) is the rotating center of the rotating shaft, the center line of the second fixing shaft (11) is parallel to the center line of the first fixing shaft (8), the rotating shaft forms a bending shaft, and the probe (5) is fixed on the second fixing shaft (11) and is adjustable in the radial direction.
5. The shimming tool according to claim 4, further comprising a probe fixing rod (4), wherein the probe (5) is fixed on the probe fixing rod (4), the probe fixing rod (4) is fixedly inserted on the second fixing shaft (11) and the fixing position of the probe fixing rod is adjustable in the radial direction.
6. The shimming tool according to claim 5, wherein a locking threaded hole is formed in the second fixing shaft (11), the locking threaded hole is communicated with an insertion hole formed in the second fixing shaft (11) and used for inserting the probe fixing rod (4), and a locking screw (14) is connected to the locking threaded hole in a threaded mode to press the probe fixing rod (4) tightly.
7. The shimming tool according to any claim 1 to 6, characterized in that the first positioning disc (10) is further provided with a patch hole (6) for performing a patch to adjust the uniformity of the magnetic field.
8. The shimming tool according to claim 7, further comprising a second positioning disc (3) for supporting the first positioning disc (10), wherein the second positioning disc (3) is rotatably connected to the rotating shaft.
9. The shimming tool according to claim 7, characterized in that the first positioning disc (10) comprises a first annular plate, a second annular plate parallel to the first annular plate and a connecting plate connected between the first annular plate and the second annular plate, the positioning hole (12) is formed in the first annular plate, and the patch hole (6) is formed in the second annular plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811613560.9A CN109597008B (en) | 2018-12-27 | 2018-12-27 | Shimming tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811613560.9A CN109597008B (en) | 2018-12-27 | 2018-12-27 | Shimming tool |
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| Publication Number | Publication Date |
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| CN109597008A CN109597008A (en) | 2019-04-09 |
| CN109597008B true CN109597008B (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811613560.9A Active CN109597008B (en) | 2018-12-27 | 2018-12-27 | Shimming tool |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531290B (en) * | 2019-09-06 | 2021-10-08 | 上海东软医疗科技有限公司 | Nuclear magnetic resonance apparatus |
| CN116430280B (en) * | 2023-06-14 | 2023-09-19 | 潍坊新力超导磁电科技有限公司 | Gradient magnetic field measuring device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435857A (en) * | 2008-12-25 | 2009-05-20 | 北京理工大学 | Cylinder surface even field coil of magnetic nuclear resonance spectrometer and design method thereof |
| CN103576113B (en) * | 2012-07-26 | 2016-06-08 | 西门子(深圳)磁共振有限公司 | A kind of superconducting magnet and shimming device thereof and method for shimming |
| CN102998633B (en) * | 2012-12-12 | 2015-06-17 | 中国科学院高能物理研究所 | Magnetic field measurement device of magnetic resonance imaging superconducting magnet central area |
| KR101856646B1 (en) * | 2014-07-18 | 2018-05-14 | 삼성전자주식회사 | Magnetic resonance imaging apparatus and controlling |
| CN204789964U (en) * | 2015-07-02 | 2015-11-18 | 江苏美时医疗技术有限公司 | A device for nuclear magnetic resonance shimming |
| CN105280325A (en) * | 2015-11-19 | 2016-01-27 | 东南大学 | Multistage passive uniform-field permanent magnet for nuclear magnetic resonance detection |
| DE102017205485A1 (en) * | 2017-03-31 | 2018-10-04 | Bruker Biospin Gmbh | Permanent magnet arrangement for MR apparatus with axially and laterally displaceable, rotatably mounted ring assemblies |
| CN108802644B (en) * | 2018-05-24 | 2020-09-15 | 上海东软医疗科技有限公司 | Shimming method and device for gradient coil |
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Denomination of invention: Shimming tooling Effective date of registration: 20210615 Granted publication date: 20201222 Pledgee: Weifang rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: WEIFANG XINLI SUPERCONDUCTING MAGNET TECHNOLOGY Co.,Ltd. Registration number: Y2021980004794 |
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Date of cancellation: 20220628 Granted publication date: 20201222 Pledgee: Weifang rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: WEIFANG XINLI SUPERCONDUCTING MAGNET TECHNOLOGY Co.,Ltd. Registration number: Y2021980004794 |