CN113639971B - Method for calibrating tube shaft component - Google Patents
Method for calibrating tube shaft component Download PDFInfo
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- CN113639971B CN113639971B CN202110958807.6A CN202110958807A CN113639971B CN 113639971 B CN113639971 B CN 113639971B CN 202110958807 A CN202110958807 A CN 202110958807A CN 113639971 B CN113639971 B CN 113639971B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/005—Testing of reflective surfaces, e.g. mirrors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/04—Optical benches therefor
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention belongs to the technical field of optical instruments, and particularly relates to a method for calibrating a tube shaft component.
Description
Technical Field
The invention belongs to the technical field of optical instruments, and particularly relates to a method for calibrating a tube shaft component.
Background
Monochromators are used to split incident light into monochromatic light and accurately "extract" the desired light of a certain wavelength. The reflecting mirror and the grating rotation axis of the angle grating monochromator should be arranged in the same plumb plane at intervals in parallel, and when in use, the reflecting mirror and the grating need to rotate corresponding angles to obtain the required monochromatic light. The accuracy of the installation of the reflecting mirror and the grating rotating shaft directly influences the resolution of the monochromator. As shown in figure 3, the reflecting mirror and the grating rotating shaft are hollow tube shafts, and the central axis of the reflecting mirror and the grating rotating shaft is missing, so that the difficulty in assembling the instrument is brought. After the plane mirror rotating shaft and the grating rotating shaft are parallel, how to calibrate the axes of the two shafts to be positioned in the same plumb face becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for calibrating a tube shaft component, which can obtain a monochromator with assembly precision of a plane mirror rotating shaft and a grating rotating shaft meeting requirements.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a calibrating method of a tube shaft part comprises the steps that a base is arranged on a calibrating platform, a level gauge is arranged on a side frame of the base, a theodolite is arranged on the outer end, adjacent to a grating rotating shaft, of the base, a target is arranged at the shaft end of the grating rotating shaft or a plane mirror rotating shaft, and the center of the target is observed and calibrated by the level gauge or the theodolite;
the calibration steps are as follows:
A. calibrating a grating rotating shaft;
a1, installing a target at the end part of a grating rotary shaft, aiming the target by using a theodolite and adjusting a base to rotate until the axis of the grating rotary shaft and the sight shaft of the theodolite are positioned in the same plumb plane;
a2, installing the target at the end part of the grating rotary shaft, aiming the target by using a level gauge and adjusting the height posture of the base until the axis of the grating rotary shaft is horizontally arranged;
B. calibrating a rotating shaft of the plane mirror;
the target is arranged at one end of the plane mirror rotating shaft, the position relation between the center of the target and the vertical wire of the theodolite is observed, and the base is adjusted to rotate around the axis of the grating rotating shaft until the axis of the plane mirror rotating shaft and the sight shaft of the theodolite are positioned in the same plumb face.
When the target is arranged on the grating rotating shaft or the plane mirror rotating shaft, the center of the target is regarded as the axle center of the corresponding rotating shaft. According to the method, a theodolite and a level are used for aiming at a target arranged on a grating rotating shaft, the grating rotating shaft is calibrated, and then a base is adjusted according to the deflection azimuth of the center of the target arranged on the plane mirror rotating shaft relative to a vertical wire of the theodolite, so that the plane mirror rotating shaft and the grating rotating shaft with the axes horizontally arranged and positioned on the same plumb face can be efficiently calibrated.
Drawings
The contents expressed in the drawings of the present specification and the marks in the drawings are briefly described as follows:
FIG. 1 is a schematic diagram of an instrument to be calibrated in an embodiment;
FIG. 2 is a front view of an instrument to be calibrated in an embodiment;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic representation of a target;
FIG. 5 is a schematic top plan arrangement of a theodolite and a tube axis to be calibrated;
FIG. 6 is a schematic side view layout of a theodolite and a tube shaft to be calibrated;
FIGS. 7 and 8 are schematic side view arrangements of the theodolite and tube axes to be calibrated of step A1;
FIG. 9 is a schematic top plan layout of a theodolite, level, and tube axis to be calibrated;
fig. 10 and 11 are views of the theodolite eyepiece in the state shown in fig. 6.
In the figure: 10. the device comprises a base, a grating rotating shaft I, a grating rotating shaft II, a plane mirror rotating shaft 30, a level gauge 40, a theodolite 50 and a target 60.
Detailed Description
The following describes the embodiments of the present invention in further detail by way of examples with reference to the accompanying drawings.
Example 1
In this embodiment, as shown in fig. 1-3, a grating mount 11 and a mirror mount 12 are rotatably connected to a base 10 of the grating monochromator, two ends of the integrally U-shaped grating mount 11 are hinged to the base 10 through a first grating rotation shaft 21 and a second grating rotation shaft 22, and the mirror mount 12 is hinged to the base 10 through a plane mirror rotation shaft 30. The axes of the first grating rotary shaft 21 and the second grating rotary shaft 22 are coincident, and the axis of the plane mirror rotary shaft 30 is parallel to the axes of the first grating rotary shaft 21 and the second grating rotary shaft 22.
In this embodiment, the grating rotation shaft 20 to be calibrated is composed of two separate tube shaft grating rotation shafts 21 and 22 with coincident axes, and in other embodiments, the grating rotation shaft 20 to be calibrated may be a complete and continuous tube shaft, and the targets 60 can be mounted at both ends of the tube shaft.
The target 60 used in this embodiment is shown in fig. 4, and includes a target shaft sleeve 100 that is integrally in a stepped shaft shape, a lens 300 is disposed in a placement cavity of the target shaft sleeve 100, a plurality of concentric circles are disposed on the lens 300, the center of each concentric circle is the center of the target, and when the target 60 is inserted into a tube shaft to be calibrated, the center of the target coincides with the axis of the corresponding rotating shaft. For a specific structure of the target 60, see patent No. 202110777573.5 filed by the applicant at 2021, 7, 9, "a target device for device calibration".
Before calibration, the base 10 of the grating monochromator is mounted on a calibration platform, and a level 40 and a theodolite 50 are erected. As shown in fig. 9, the leveling instrument 40 is located at the side of the base 10, and the connecting line between the center of the leveling instrument 40 and the centers of the first and second grating rotating shafts 21 and 22 and the axis of the first grating rotating shaft 21 are arranged at an included angle in the horizontal direction, so that when the target 60 is mounted on the first grating rotating shaft 21 or the second grating rotating shaft 22, no shielding exists between the leveling instrument 40 and the center of the target. The theodolite 50 is arranged adjacent to the first grating rotary shaft 21 and is positioned at the axial center extension lines of the first grating rotary shaft 21, the second grating rotary shaft 21 and the second grating rotary shaft 22, namely, the visual theodolite 50, the first grating rotary shaft 21 and the second grating rotary shaft 22 are positioned on the same straight line.
The calibration method comprises the following steps:
A. calibrating the grating rotation shaft 20;
a1, as shown in fig. 7 and 8, the same target 60 is alternately arranged on the first grating rotary shaft 21 and the second grating rotary shaft 22, the target 60 is aimed by the theodolite 50 and the base 10 is adjusted to rotate on the adjusting platform until the center of the target 60 arranged on the first grating rotary shaft 21 and the second grating rotary shaft 22 coincides with the vertical wire of the theodolite 50 or only the pitch posture of the theodolite 50 is adjusted, and the center of the target 60 arranged on the first grating rotary shaft 21 and the second grating rotary shaft 22 coincides with the fork wire center of the theodolite 50. Thus, the centers of the targets 60 arranged on the first grating rotary shaft 21 and the second grating rotary shaft 22 are determined to be positioned in the same plumb plane with the sight axis of the theodolite 50, namely, the axes of the grating rotary shaft 20 and the sight axis of the theodolite 50 are positioned in the same plumb plane.
Maintaining the attitude of theodolite 50.
A2, as shown in fig. 9, the same target 60 is alternately arranged on the first grating rotating shaft 21 and the second grating rotating shaft 22, the target 60 is aimed by the leveling instrument 40, and the height posture of the base 10 is adjusted until only the horizontal observation angle of the leveling instrument 40 is adjusted, and the distances between the centers of the targets 60 and the transverse wires on the first grating rotating shaft 21 and the second grating rotating shaft 22 are the same. As shown in fig. 4, 10 and 11, a plurality of concentric circles are arranged on the lens 300 of the target 60, and the target 60 mounted on the first grating rotary shaft 21 and the second grating rotary shaft 22 is observed by the leveling instrument 40, and when the upper side of the same concentric circle on the target lens 300 is tangential to the transverse wire, or the lower side of the same concentric circle on the target lens 300 is tangential to the transverse wire, or the smallest concentric circle on the target lens 300 is coincident with the transverse wire, the centers of the targets 60 mounted on the first grating rotary shaft 21 and the second grating rotary shaft 22 are positioned in the same horizontal plane, i.e. the axes of the grating rotary shafts 20 are horizontally arranged.
B. Calibrating the plane mirror rotating shaft 30;
as shown in fig. 5 and 6, the target 60 is mounted at the end of the mirror rotating shaft 30, the positional relationship between the center of the target and the vertical wire of the theodolite 50 is observed, and the base 10 is adjusted to rotate around the axis of the grating rotating shaft 20, so that the center of the target 60 mounted at the end of the mirror rotating shaft 30 coincides with the vertical wire of the theodolite 50. As shown in fig. 10, when the center of the target 60 mounted on the mirror rotating shaft 30 is located at the left side of the vertical wire, the base 10 is adjusted to rotate counterclockwise around the axis of the grating rotating shaft 20 to the posture shown in fig. 11, so that the grating rotating shaft 20 and the mirror rotating shaft 30 are located in the same plumb plane and the two shafts are respectively arranged horizontally.
As shown in fig. 1-3, when the target 60 is inserted into the first grating rotary shaft 21 or the second grating rotary shaft 22, the center of the target coincides with the axes of the first grating rotary shaft 21 and the second grating rotary shaft 22. In this way, the posture of the grating pivot shaft 20 can be calibrated by calibrating the positions of the centers of the targets 60 inserted in the first and second grating pivot shafts 21, 22. The shaft end of the plane mirror rotating shaft 30 far from the grating rotating shaft 20 can be matched with the target 60, and the posture of the plane mirror rotating shaft 30 cannot be directly calibrated in the mode, so that the method adopts the sequence of calibrating the grating rotating shaft 20 and then calibrating the plane mirror rotating shaft 30.
In this embodiment, the same target 60 is alternatively installed on the first grating rotation shaft 21, the second grating rotation shaft 22, and the shaft ends of the plane mirror rotation shaft 30 to be used as calibration references, so that the calibration accuracy can be prevented from being affected by manufacturing errors of different targets 60. In other embodiments, when the adjustment accuracy meets the requirement, a plurality of targets 60 may be installed at the axial ends of the grating rotation shaft 20 and the plane mirror rotation shaft 30 at the same time, so as to improve the adjustment efficiency.
Example two
The difference between this embodiment and the first embodiment is that, after the base 10 is mounted on the adjustment platform, the positioning of the theodolite 50 includes the following steps:
k1, drawing or marking a reference line extending outward from the base 10 with reference to the axial extending directions of the first grating rotation shaft 21 and the second grating rotation shaft 22. The projections of the initial states of the first grating rotary shaft 21 and the second grating rotary shaft 22 in the horizontal plane are straight lines, and the reference line is visually overlapped with the straight lines. The reference line is the vertical line of the axle center of the first grating rotary shaft 21 and the second grating rotary shaft 22 on the calibration platform and the ground.
K2, erecting the theodolite 50 on the reference line, adjusting the erecting height of the theodolite 50, and confirming that the axle center of the plane mirror rotating shaft 30 can be observed from the ocular of the theodolite 50 through the axle holes of the first grating rotating shaft 21 and the second grating rotating shaft 22. The target 60 is mounted at the end of the plane mirror pivot shaft 30, and the erection height and pitching attitude of the theodolite 50 are adjusted until the target center of the target 60 can be observed through the grating pivot shafts one 21 and two 22.
Example III
The difference between the present embodiment and the first embodiment is that the adjustment device between the base 10 and the adjustment platform cannot directly realize the rotation of the base 10 around the axis of the grating rotation shaft 20. In step B, the posture of the grating rotation shaft 20 may be changed when the base 10 is adjusted, so step C is further included after step B, and the grating rotation shaft 20 and the plane mirror rotation shaft 30 are checked. The verification steps are as follows:
c1, checking whether the axis of the grating rotary shaft 20 is horizontally arranged, if not, repeating the step A2, and if so, entering the step C2;
the same target 60 is firstly and later installed on the first grating rotary shaft 21 and the second grating rotary shaft 22, whether the center of the target 60 installed on the first grating rotary shaft 21 and the second grating rotary shaft 22 is the same as the distance between the transverse wires of the level gauge 40 or not is observed, if yes, the horizontal arrangement of the axle center of the grating rotary shaft 20 is judged, and if not, the non-horizontal arrangement of the axle center of the grating rotary shaft 20 and the sight shaft of the theodolite 50 is judged.
C2, checking whether the axis of the grating rotary shaft 20 and the sight axis of the theodolite 50 are positioned in the same plumb plane, if not, repeating the step A1, and if so, entering the step C3;
the same target 60 is firstly and later installed on the first grating rotary shaft 21 and the second grating rotary shaft 22, whether the centers of the targets 60 installed on the first grating rotary shaft 21 and the second grating rotary shaft 22 are overlapped with the vertical wires of the theodolite 50 or not is observed, if yes, the axle center of the grating rotary shaft 20 and the sight shaft of the theodolite 50 are judged to be positioned in the same plumb plane, and if not, the axle center of the grating rotary shaft 20 and the sight shaft of the theodolite 50 are judged to be not positioned in the same plumb plane.
And C3, checking whether the axes of the plane mirror rotating shaft 30 and the grating rotating shaft 20 are positioned in the same plumb plane, if not, repeating the step B, and if so, completing the calibration operation;
the target 60 is mounted at the end of the plane mirror rotating shaft 30, whether the center of the target coincides with the vertical wire of the theodolite 50 is observed, if so, the axes of the plane mirror rotating shaft 30 and the grating rotating shaft 20 are judged to be positioned in the same plumb plane, and if not, the axes of the plane mirror rotating shaft 30 and the grating rotating shaft 20 are judged to be not positioned in the same plumb plane.
Example IV
The difference between this embodiment and the third embodiment is that in step a, calibration is performed according to steps A2 and A1, that is, the base 10 is adjusted to horizontally arrange the axis of the grating rotary shaft 20, and then the base 10 is adjusted to make the axis of the grating rotary shaft 20 coplanar with the collimation axis of the theodolite 50.
Claims (8)
1. A method of calibrating a tubular shaft member, comprising: the base (10) of the grating monochromator is hinged with the grating mounting seat (11) through a grating rotating shaft (20), and is hinged with the reflector mounting seat (12) through a plane mirror rotating shaft (30), and the axis of the plane mirror rotating shaft (30) is arranged in parallel with the axis of the grating rotating shaft (20);
the base (10) is arranged on the adjusting platform, a leveling instrument (40) is arranged on a side frame of the base (10), a theodolite (50) is arranged at the outer end of the base (10) adjacent to the grating rotating shaft (20), the target (60) is arranged at the shaft end of the grating rotating shaft (20) or the plane mirror rotating shaft (30), and the center of the target is observed by the leveling instrument (40) or the theodolite (50) and the base (10) is adjusted;
the calibration steps are as follows:
A. calibrating the grating rotation axis (20);
a1, installing a target (60) at the end part of a grating rotary shaft (20), aiming the target (60) by using a theodolite (50) and adjusting a base (10) to rotate until the axis of the grating rotary shaft (20) and the sight shaft of the theodolite (50) are positioned in the same plumb plane;
a2, installing a target (60) at the end part of the grating rotary shaft (20), aiming the target (60) by using a level gauge (40) and adjusting the height posture of the base (10) until the axis of the grating rotary shaft (20) is horizontally arranged;
B. calibrating a plane mirror rotation shaft (30);
the target (60) is arranged at one end of the plane mirror rotating shaft (30), the position relation between the center of the observation target and the vertical wire of the theodolite (50) is used for adjusting the base (10) to rotate around the axis of the grating rotating shaft (20) until the axis of the plane mirror rotating shaft (30) and the sight shaft of the theodolite (50) are positioned in the same plumb plane.
2. The method of calibrating a tubular shaft component according to claim 1, wherein: also comprises a step K positioned before the step A1, positioning the theodolite (50),
k1, drawing or marking a reference line which is consistent with the axial extension direction of the grating rotary shaft (20);
k2, erecting a theodolite (50) on a reference line, adjusting the erection height of the theodolite (50), and confirming that the axle center of the plane mirror rotating shaft (30) can be observed from the ocular of the theodolite (50) through the axle hole of the grating rotating shaft (20).
3. The method of calibrating a tubular shaft component according to claim 1, wherein: the step B also comprises a step C,
c1, checking whether the axle center of the grating rotary shaft (20) is horizontally arranged, if not, repeating the step A2, and if so, entering the step C2;
c2, checking whether the axle center of the grating rotary shaft (20) and the sight axis of the theodolite (50) are positioned in the same plumb plane, if not, repeating the step A1, and if so, entering the step C3;
and C3, checking whether the rotating shaft (30) of the plane mirror and the grating rotating shaft (20) are positioned in the same plumb plane, if not, repeating the step B, and if so, completing the calibration operation.
4. The method of calibrating a tubular shaft component according to claim 1, wherein: in step a, calibration is performed in the order of steps A2 and A1.
5. The method of calibrating a tubular shaft component according to any of claims 1-4, wherein: the same target (60) is alternately arranged at the shaft ends of the grating rotating shaft (20) and the plane mirror rotating shaft (30) to be used as a calibration standard.
6. The method of calibrating a tubular shaft member according to claim 5, wherein: the grating rotary shaft (20) comprises a first grating rotary shaft (21) and a second grating rotary shaft (22), wherein the axes of the first grating rotary shaft and the second grating rotary shaft are coincident, and the shaft bodies of the first grating rotary shaft and the second grating rotary shaft are arranged separately.
7. The method of calibrating a tubular shaft member according to claim 6, wherein: in the step A, the same target (60) is alternately arranged at the shaft ends of a first grating rotary shaft (21) and a second grating rotary shaft (22), the target is observed by using a theodolite (50) and the base (10) is adjusted until the center of the target (60) arranged on the first grating rotary shaft (21) and the second grating rotary shaft (22) coincides with a vertical wire of the theodolite (50) when the posture of the theodolite (50) is maintained.
8. The method of calibrating a tubular shaft member according to claim 6, wherein: in the step B, the same target (60) is alternately arranged on the first grating rotating shaft (21) and the second grating rotating shaft (22), the target is observed by the leveling instrument (40) and the base (10) is adjusted until the observation part of the leveling instrument (40) is horizontally rotated, and the center of the target (60) arranged on the first grating rotating shaft (21) and the second grating rotating shaft (22) is equal to the distance between transverse wires of the leveling instrument (40).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958807.6A CN113639971B (en) | 2021-08-20 | 2021-08-20 | Method for calibrating tube shaft component |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110958807.6A CN113639971B (en) | 2021-08-20 | 2021-08-20 | Method for calibrating tube shaft component |
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| CN113639971A CN113639971A (en) | 2021-11-12 |
| CN113639971B true CN113639971B (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116125655B (en) * | 2022-12-23 | 2023-08-22 | 安徽创谱仪器科技有限公司 | Method for assembling raster scanning device and raster scanning device |
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| JPH10141946A (en) * | 1996-11-07 | 1998-05-29 | Nec Eng Ltd | Theodolite facing mirror and method for measuring directed angle |
| CN101153819A (en) * | 2006-09-29 | 2008-04-02 | 中国科学院长春光学精密机械与物理研究所 | Method for optical spectrum tuning angle calibration of monochromator with variable included angle |
| CN104748947A (en) * | 2015-04-23 | 2015-07-01 | 江苏省计量科学研究院 | Method of calibrating rotational angle of automatic turntable of luminous distribution performance test system for lamps |
| CN107481289A (en) * | 2017-07-13 | 2017-12-15 | 西安应用光学研究所 | The precision target drone system and method for big visual field camera far field calibration |
| CN110865094A (en) * | 2019-12-13 | 2020-03-06 | 中国工程物理研究院激光聚变研究中心 | Multi-channel vacuum extreme ultraviolet-soft X-ray monochromator |
| CN111896107A (en) * | 2020-07-31 | 2020-11-06 | 安徽创谱仪器科技有限公司 | Grating monochromator |
-
2021
- 2021-08-20 CN CN202110958807.6A patent/CN113639971B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10141946A (en) * | 1996-11-07 | 1998-05-29 | Nec Eng Ltd | Theodolite facing mirror and method for measuring directed angle |
| CN101153819A (en) * | 2006-09-29 | 2008-04-02 | 中国科学院长春光学精密机械与物理研究所 | Method for optical spectrum tuning angle calibration of monochromator with variable included angle |
| CN104748947A (en) * | 2015-04-23 | 2015-07-01 | 江苏省计量科学研究院 | Method of calibrating rotational angle of automatic turntable of luminous distribution performance test system for lamps |
| CN107481289A (en) * | 2017-07-13 | 2017-12-15 | 西安应用光学研究所 | The precision target drone system and method for big visual field camera far field calibration |
| CN110865094A (en) * | 2019-12-13 | 2020-03-06 | 中国工程物理研究院激光聚变研究中心 | Multi-channel vacuum extreme ultraviolet-soft X-ray monochromator |
| CN111896107A (en) * | 2020-07-31 | 2020-11-06 | 安徽创谱仪器科技有限公司 | Grating monochromator |
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| 双晶单色仪第一晶体初安装姿态误差分析;曹冲振;王凤芹;张明辉;李玉善;赵春雨;;核技术;32(09);全文 * |
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Address after: Building 11, Phase II, Yingtang Industrial Park, No. 103 Huatuo Lane, Shulu Community Service Center, High tech Zone, Hefei City, Anhui Province 230000 Patentee after: ANHUI SPECREATION INSTRUMENT SCIENCE & TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 230000 8th floor, building 1, No. 228, Wanshui Road, high tech Zone, Shushan District, Hefei City, Anhui Province Patentee before: ANHUI SPECREATION INSTRUMENT SCIENCE & TECHNOLOGY Co.,Ltd. Country or region before: China |
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