CN110470734A - A kind of frequency-adjustable ultrasonic probe - Google Patents
A kind of frequency-adjustable ultrasonic probe Download PDFInfo
- Publication number
- CN110470734A CN110470734A CN201910722822.3A CN201910722822A CN110470734A CN 110470734 A CN110470734 A CN 110470734A CN 201910722822 A CN201910722822 A CN 201910722822A CN 110470734 A CN110470734 A CN 110470734A
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- CN
- China
- Prior art keywords
- wall
- frequency
- metal shell
- ultrasonic probe
- piezoceramics layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000000523 sample Substances 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000000919 ceramic Substances 0.000 claims description 8
- 239000002320 enamel (paints) Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 56
- 238000001514 detection method Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
Abstract
The present invention provides a kind of frequency-adjustable ultrasonic probes, comprising: metal shell, liner, multiple piezoceramics layers and multiple walls；The center of the accommodating chamber of metal shell is arranged in liner；Multiple piezoceramics layers are provided between the outer wall of liner and the inner wall of metal shell；Wall is provided between every two adjacent piezoceramics layer；The outer wall of each piezoceramics layer is cathode, and inner wall is anode；Each piezoceramics layer is respectively provided with different resonance frequencies；Each piezoceramics layer, which is located on the inner wall of the side at the outlet hole of center, is provided with cathode-chip wiring, is provided with cathode wiring plate on the outer wall of the other side at the outlet hole of center；Each cathode wiring plate is connected with each other by a negative wire；Each positive terminal on piece is respectively connected with a positive wire；Each positive wire stretches out the metal shell via the center outlet hole.It can according to need the ultrasonic signal for generating one or more different frequencies using the present invention.
Description
Technical field
This application involves technical field of nondestructive testing more particularly to a kind of frequency-adjustable ultrasonic to pop one's head in.
Background technique
For the concrete modular of large volume concrete structural or labyrinth, often due to its oversized or structure compared with
For complexity, the mode for not being available traditional ultrasound examination defect examines inside configuration defect that may be present from outside
It surveys.
Although have been proposed in the prior art it is some can be embedded in the detecting devices in geodesic structure, these spy
Measurement equipment generally can only all issue the detectable signal of fixed frequency, to be difficult to be suitable for different distance, various sizes of mixed
The detection and judgement of Xtah Crude Clay structure internal flaw.
Summary of the invention
In view of this, the present invention provides a kind of frequency-adjustable ultrasonic probe, so as to generate as needed it is a kind of or
The ultrasonic signal of a variety of different frequencies.
Technical solution of the present invention is specifically achieved in that
A kind of frequency-adjustable ultrasonic probe, frequency-adjustable ultrasonic probe include: metal shell, liner, multiple piezoelectricity pottery
Enamel coating and multiple walls；
The metal shell is internally provided with accommodating chamber；
The center of the accommodating chamber of the metal shell is arranged in the liner, for offsetting and absorbing piezoceramics layer
To inward side to the ultrasonic signal of generation when vibration；
Multiple piezoceramics layers are provided between the outer wall of the liner and the inner wall of the metal shell；The pressure of innermost layer
Electroceramics layer is covered in the outer surface of the liner；The metal shell is covered in the outer surface of outermost piezoceramics layer；
A wall is provided between every two adjacent piezoceramics layer；
The outer wall of each piezoceramics layer is cathode, and inner wall is anode；Each piezoceramics layer is respectively provided with different humorous
Vibration frequency；
Center outlet hole, which runs through, is opened in metal shell, each piezoceramics layer and each wall；
Each piezoceramics layer is located on the inner wall of the side at the outlet hole of center is provided with cathode-chip wiring, is located at
Cathode wiring plate is provided on the outer wall of the other side at heart outlet hole；The cathode wiring plate of outermost piezoceramics layer with
The inner wall of the metal shell connects；
Each cathode wiring plate is connected with each other by a negative wire；Each positive terminal on piece is being respectively connected with one just
Pole lead；Each positive wire stretches out the metal shell via the center outlet hole.
Preferably, the liner is spherical shape；The metal shell, multiple piezoceramics layers and multiple walls are spherical shell
Shape.
Preferably, each piezoceramics layer includes two hemispherical Shells, described two hemispherical Shells are distinguished in top and bottom
It links together.
Preferably, be provided on the inner and outer wall at the bottom seam of two hemispherical Shells it is conductive can across
Contact pin.
Preferably, the jumper can be arranged at the bottom seam of two hemispherical Shells by way of gluing or welding
Inner and outer wall on.
Preferably, the jumper is made of copper.
Preferably, the piezoceramics layer is spherical shell shape piezoelectric ceramic wafer.
Preferably, the liner is pressed by metal powder and epoxy resin.
Preferably, metal material of the wall by surface Jing Guo insulation processing is made.
Preferably, the quantity of the piezoceramics layer is 4, the quantity of the wall is 3.
As above as it can be seen that in the present invention frequency-adjustable ultrasonic probe in, use multilayer coating structure, specifically include that
Metal shell, liner, multiple piezoceramics layers and multiple walls.Since each piezoceramics layer is respectively provided with different resonance
Frequency can generate the ultrasonic signal of different frequency under the excitation of different voltages, therefore, state Frequency Adjustable ultrasound in use
When wave is popped one's head in, which can be popped one's head in the inside being embedded in geodesic structure, then be controlled by instrument, root
According to actual needs, a certain layer or a few layers of piezoceramics layer are motivated respectively, can also simultaneously to all piezoceramics layers into
Row energization, so that the ultrasonic signal of one or more different frequencies is generated, to realize to the probe place each side of spatial peripheral
To transmitting ultrasonic signal, or the ultrasonic signal from all directions is received, so as to be suitable for different distance, difference
The detection and judgement of the concrete structure internal flaw of size.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the frequency-adjustable ultrasonic probe in the embodiment of the present invention.
Fig. 2 is the partial enlarged view one of Fig. 1.
Fig. 3 is the partial enlarged view two of Fig. 1.
Specific embodiment
For technical solution of the present invention and advantage is more clearly understood, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
Fig. 1 is the structural schematic diagram of the frequency-adjustable ultrasonic probe in the embodiment of the present invention.
As shown in Figure 1, Figure 2 and Figure 3, it includes: metal shell 11 that the frequency-adjustable ultrasonic in the embodiment of the present invention, which is popped one's head in, interior
Lining 12, multiple piezoceramics layers 13 and multiple walls 14；
The metal shell 11 is internally provided with accommodating chamber；
The center of the accommodating chamber of the metal shell 11 is arranged in the liner 12, for offsetting and absorbing piezoelectricity pottery
To inward side to the ultrasonic signal of generation when enamel coating vibrates, be transmitted to after preventing ultrasonic signal from passing through liner opposite to
The ultrasonic signal that piezoceramics layer issues outward is interfered；
Multiple piezoceramics layers 13 are provided between the outer wall of the liner 12 and the inner wall of the metal shell 11；It is most interior
The piezoceramics layer of layer is covered in the outer surface of the liner 12；The metal shell 11 is covered in outermost piezoceramics layer
Outer surface；A wall 14 is provided between every two adjacent piezoceramics layer；
The outer wall of each piezoceramics layer 13 is cathode, and inner wall is anode；Each piezoceramics layer 13 is respectively provided with difference
Resonance frequency；
Center outlet hole 15, which runs through, is opened in metal shell 11, each piezoceramics layer 13 and each wall 14；
Each piezoceramics layer 13, which is located on the inner wall of the side at center outlet hole 15, is provided with cathode-chip wiring 21,
Cathode wiring plate 23 is provided on the outer wall of the other side at center outlet hole 15；Outermost piezoceramics layer is born
Pole lug plate is connect with the inner wall of the metal shell 11；
Each cathode wiring plate 23 is connected with each other by a negative wire 24；It is respectively connected on each cathode-chip wiring 21
A piece positive wire 22；Each positive wire 22 stretches out the metal shell via the center outlet hole 15.
In above-mentioned frequency-adjustable ultrasonic probe, the anode of each piezoceramics layer all picks out an anode respectively and draws
Line, can form a branch of in assembly, stretch out metal shell via center outlet hole, and can be connected to detection via spininess connector
Equipment；The cathode of each piezoceramics layer then passes through same root negative wire and is connected, and is connected to outermost piezoceramics layer appearance
The negative terminal on piece in face, so that the inner surface with metal shell is connected.Due to each piezoceramics layer be respectively provided with it is different
Therefore resonance frequency, the ultrasonic signal that different frequency can be generated under the excitation of different voltages state Frequency Adjustable in use
When ultrasonic probe, which can be popped one's head in the inside being embedded in geodesic structure, then be controlled by instrument
System, according to actual needs, respectively motivates a certain layer or a few layers of piezoceramics layer, can also be simultaneously to all piezoelectric ceramics
Layer is motivated, so that the ultrasonic signal of one or more different frequencies is generated, so as to be suitable for different distance, no
With the detection and judgement of the concrete structure internal flaw of size.
In addition, as an example, silver-plated and polarization method can be passed through in of the invention one preferable specific embodiment
So that the outer wall and inner wall of piezoceramics layer are respectively formed cathode and anode.
In addition, as an example, the liner is spherical shape, the gold in of the invention one preferable specific embodiment
Belonging to shell, multiple piezoceramics layers and multiple walls is spherical shell shape.
In addition, in the inventive solutions, the piezoelectricity can be preset according to the needs of practical situations
The number of ceramic layer and wall.
For example, as an example, as shown in Figure 1, in of the invention one preferable specific embodiment, the piezoelectric ceramics
The quantity of layer is 4, and the quantity of the wall is 3.
In addition, as an example, the piezoceramics layer is spherical shell shape in of the invention one preferable specific embodiment
Piezoelectric ceramic wafer.
In addition, as an example, each piezoceramics layer includes two in of the invention one preferable specific embodiment
A hemispherical Shell, described two hemispherical Shells are respectively connected together in top and bottom.For example, can be by connector by two and half
Spherical shell links together, and two hemispherical Shells can also be bonded together by adhesive.
In addition, as an example, in of the invention one preferable specific embodiment, it can be in the bottom of two hemispherical Shells
The jumper 25 of conductive energy is respectively provided on the inner and outer wall of seam crossing, so that the inner and outer wall of two hemispherical Shells is equal
Good connect can be achieved.
In addition, as an example, the jumper can pass through gluing in of the invention one preferable specific embodiment
Or the mode of welding is arranged on the inner and outer wall at the bottom seam of two hemispherical Shells.
In addition, as an example, the jumper can be had by copper etc. in of the invention one preferable specific embodiment
There is the material of excellent conductive performance to be made.
In addition, as an example, the liner is by metal powder (example in of the invention one preferable specific embodiment
Such as, tungsten powder) it is pressed into epoxy resin.
In addition, as an example, the wall is by surface by exhausted in of the invention one preferable specific embodiment
The metal material (for example, aluminium) of edge processing (for example, anodic oxidation) is made.
Therefore, work can be filled using metal material of the surface Jing Guo insulation processing between each piezoceramics layer
Prevent each piezoelectricity when probe work from making pottery so that the space between each piezoceramics layer is completely filled for wall
Enamel coating is directly contacted and is had an impact mutually.In addition, can also be used in assembly the materials such as vaseline to piezoceramics layer and
Interlayer is coupled, and prevents interlayer from generating uncompacted situations such as gap.
In addition, in the inventive solutions, outermost metal shell can protect the piezoelectric ceramics inside probe
Layer is not damaged.
In conclusion in the inventive solutions, above-mentioned frequency-adjustable ultrasonic probe uses multilayer coating structure,
Specifically include that metal shell, liner, multiple piezoceramics layers and multiple walls.Since each piezoceramics layer is respectively provided with
Therefore different resonance frequencies, the ultrasonic signal that different frequency can be generated under the excitation of different voltages are stated in use
It when frequency-adjustable ultrasonic is popped one's head in, can be controlled by instrument, according to actual needs, respectively to a certain layer or a few laminations electricity
Ceramic layer is motivated, and can also be motivated simultaneously to all piezoceramics layers, to generate one or more different frequencies
Ultrasonic signal emits ultrasonic signal to realize to probe place spatial peripheral all directions, or receives and come from all directions
Ultrasonic signal, so as to be suitable for the detection of different distance, various sizes of concrete structure internal flaw and sentence
It is fixed.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (10)
1. a kind of frequency-adjustable ultrasonic probe, which is characterized in that frequency-adjustable ultrasonic probe includes: metal shell, liner, more
A piezoceramics layer and multiple walls；
The metal shell is internally provided with accommodating chamber；
The center of the accommodating chamber of the metal shell is arranged in the liner, for offsetting and absorbing piezoceramics layer vibration
When to inward side to the ultrasonic signal of generation；
Multiple piezoceramics layers are provided between the outer wall of the liner and the inner wall of the metal shell；The piezoelectricity of innermost layer is made pottery
Enamel coating is covered in the outer surface of the liner；The metal shell is covered in the outer surface of outermost piezoceramics layer；Every two
A wall is provided between a adjacent piezoceramics layer；
The outer wall of each piezoceramics layer is cathode, and inner wall is anode；Each piezoceramics layer is respectively provided with different resonance frequencies
Rate；
Center outlet hole, which runs through, is opened in metal shell, each piezoceramics layer and each wall；
Each piezoceramics layer, which is located on the inner wall of the side at the outlet hole of center, is provided with cathode-chip wiring, goes out positioned at center
Cathode wiring plate is provided on the outer wall of the other side at string holes；The cathode wiring plate of outermost piezoceramics layer with it is described
The inner wall of metal shell connects；
Each cathode wiring plate is connected with each other by a negative wire；Each positive terminal on piece is respectively connected with an anode and draws
Line；Each positive wire stretches out the metal shell via the center outlet hole.
2. frequency-adjustable ultrasonic probe according to claim 1, it is characterised in that:
The liner is spherical shape；The metal shell, multiple piezoceramics layers and multiple walls are spherical shell shape.
3. frequency-adjustable ultrasonic probe according to claim 1 or 2, it is characterised in that:
Each piezoceramics layer includes two hemispherical Shells, and described two hemispherical Shells are respectively connected together in top and bottom.
4. frequency-adjustable ultrasonic probe according to claim 3, it is characterised in that:
The jumper of conductive energy is provided on the inner and outer wall at the bottom seam of two hemispherical Shells.
5. frequency-adjustable ultrasonic probe according to claim 4, it is characterised in that:
Inner wall at the bottom seam of two hemispherical Shells and outer can be arranged in the jumper by way of gluing or welding
On wall.
6. frequency-adjustable ultrasonic probe according to claim 4, it is characterised in that:
The jumper is made of copper.
7. frequency-adjustable ultrasonic probe according to claim 2, it is characterised in that:
The piezoceramics layer is spherical shell shape piezoelectric ceramic wafer.
8. frequency-adjustable ultrasonic probe according to claim 1, it is characterised in that:
The liner is pressed by metal powder and epoxy resin.
9. frequency-adjustable ultrasonic probe according to claim 1, it is characterised in that:
Metal material of the wall by surface Jing Guo insulation processing is made.
10. frequency-adjustable ultrasonic probe according to claim 1, it is characterised in that:
The quantity of the piezoceramics layer is 4, and the quantity of the wall is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722822.3A CN110470734B (en) | 2019-08-06 | Adjustable frequency ultrasonic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722822.3A CN110470734B (en) | 2019-08-06 | Adjustable frequency ultrasonic probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110470734A true CN110470734A (en) | 2019-11-19 |
| CN110470734B CN110470734B (en) | 2024-05-03 |
Family
ID=
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305074A (en) * | 2020-10-28 | 2021-02-02 | 济南大学 | Piezoelectric ultrasonic device for on-line monitoring cement concrete hydration process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07136164A (en) * | 1993-11-12 | 1995-05-30 | Olympus Optical Co Ltd | Ultrasonic probe |
| KR20010110246A (en) * | 2001-11-05 | 2001-12-12 | 주식회사 이지메딕스 | A pile structure of ultrasonic probe |
| CN201974521U (en) * | 2010-12-22 | 2011-09-14 | 汉得利（常州）电子有限公司 | High-frequency and high-sensitivity ultrasonic sensor |
| CN103076610A (en) * | 2012-12-30 | 2013-05-01 | 常州波速传感器有限公司 | Ultrasonic transducer for automatically parking |
| CN103308259A (en) * | 2012-03-07 | 2013-09-18 | 哈尔滨盛仕瑞达科技发展有限公司 | Ultrasonic probe of laminated composite structure |
| CN104614066A (en) * | 2015-02-06 | 2015-05-13 | 杭州迪比声学技术有限公司 | Metal housing sealed type piezoelectric ceramic hydrophone |
| CN205228546U (en) * | 2015-12-02 | 2016-05-11 | 成都汇通西电电子有限公司 | Ultrasonic wave flow -meter probe |
| CN210775337U (en) * | 2019-08-06 | 2020-06-16 | 中冶建筑研究总院有限公司 | Frequency-adjustable ultrasonic probe |
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07136164A (en) * | 1993-11-12 | 1995-05-30 | Olympus Optical Co Ltd | Ultrasonic probe |
| KR20010110246A (en) * | 2001-11-05 | 2001-12-12 | 주식회사 이지메딕스 | A pile structure of ultrasonic probe |
| CN201974521U (en) * | 2010-12-22 | 2011-09-14 | 汉得利（常州）电子有限公司 | High-frequency and high-sensitivity ultrasonic sensor |
| CN103308259A (en) * | 2012-03-07 | 2013-09-18 | 哈尔滨盛仕瑞达科技发展有限公司 | Ultrasonic probe of laminated composite structure |
| CN103076610A (en) * | 2012-12-30 | 2013-05-01 | 常州波速传感器有限公司 | Ultrasonic transducer for automatically parking |
| CN104614066A (en) * | 2015-02-06 | 2015-05-13 | 杭州迪比声学技术有限公司 | Metal housing sealed type piezoelectric ceramic hydrophone |
| CN205228546U (en) * | 2015-12-02 | 2016-05-11 | 成都汇通西电电子有限公司 | Ultrasonic wave flow -meter probe |
| CN210775337U (en) * | 2019-08-06 | 2020-06-16 | 中冶建筑研究总院有限公司 | Frequency-adjustable ultrasonic probe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305074A (en) * | 2020-10-28 | 2021-02-02 | 济南大学 | Piezoelectric ultrasonic device for on-line monitoring cement concrete hydration process |
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Effective date of registration: 20240311 Address after: 100088 Beijing city Haidian District Xitucheng Road No. 33 Applicant after: CENTRAL RESEARCH INSTITUTE OF BUILDING AND CONSTRUCTION CO., LTD. MCC Group Country or region after: China Applicant after: INSPECTION AND CERTIFICATION Co.,Ltd. MCC Address before: 100088 Beijing city Haidian District Xitucheng Road No. 33 Applicant before: CENTRAL RESEARCH INSTITUTE OF BUILDING AND CONSTRUCTION CO., LTD. MCC Group Country or region before: China |
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