CN217424275U - Net rack construction detection device - Google Patents
Net rack construction detection device Download PDFInfo
- Publication number
- CN217424275U CN217424275U CN202220579288.2U CN202220579288U CN217424275U CN 217424275 U CN217424275 U CN 217424275U CN 202220579288 U CN202220579288 U CN 202220579288U CN 217424275 U CN217424275 U CN 217424275U
- Authority
- CN
- China
- Prior art keywords
- wind
- detection
- support
- rack
- annular
- 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.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 82
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000000523 sample Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 8
- 238000007689 inspection Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Abstract
The utility model discloses a net rack construction detection device, which comprises an annular fixed seat, a bracket and a detection assembly, wherein the annular fixed seat is detachably sleeved outside a wind-resistant column; the bracket is vertically arranged, the bottom of the bracket is arranged on the annular fixed seat and can move along the circumferential direction of the annular fixed seat; the detection assembly is arranged on the support and comprises a shooting detection part for shooting the joint between the net rack and the wind-resistant column; the connection part between the net rack and the wind-resistant column is shot by the shooting detection part to detect whether the net rack and the wind-resistant column are aligned accurately and connected stably, so that manual detection is replaced, automatic detection is realized, the safety cost and the labor intensity are reduced, and the working efficiency is improved; simultaneously, will shoot the detection part and locate the support, also promptly, shoot the detection part and can follow its circumference activity in the anti-wind post outside, just also can follow the week side of anti-wind post and shoot its junction with the rack, so for the testing result is more accurate, reliable stable.
Description
Technical Field
The utility model belongs to the technical field of the steel roof truss hoist and mount technique and specifically relates to a rack construction detection device.
Background
In the building industry, the stability of being connected between rack and anti-wind post has important influence to the life of rack, consequently, also increasingly high to the detection requirement of the tie point between rack and the anti-wind post. The traditional detection method is a manual detection method, namely, detection personnel carry a load and work high above the ground, the problems of high safety cost, high labor intensity, low working efficiency and the like exist, the result is half the result, the requirements on comprehensive qualities of the detection personnel such as the mind and body are high, and a substitute automatic detection system is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rack construction detection device aims at solving current artifical detection safety with high costs, intensity of labour is big, work efficiency low scheduling problem.
In order to achieve the above object, the utility model provides a rack construction detection device, include:
the annular fixing seat is detachably sleeved on the outer side of the wind-resistant column;
the support is vertically arranged, and the bottom of the support is arranged on the annular fixed seat and can move along the circumferential direction of the annular fixed seat; and the number of the first and second groups,
the detection assembly is arranged on the support and comprises a shooting detection part, and the shooting detection part is used for shooting the net rack and connecting points between the wind-resistant columns.
Optionally, the rack construction detection device further comprises an annular chute and a ball, which are in sliding fit, wherein the annular chute is arranged on the upper end face of the annular fixed seat and extends along the peripheral side of the annular fixed seat;
correspondingly, the ball is arranged at the bottom of the support.
Optionally, at the opening edge of the annular chute, two opposite side walls of the annular chute are respectively provided with a limiting convex part in a protruding manner, and the limiting convex part is used for limiting the ball upwards and downwards.
Optionally, the rack construction detection device further comprises a driving assembly, and the driving assembly is in driving connection with the support.
Optionally, the drive assembly comprises:
the driving motor is arranged at the bottom of the annular fixed seat and is provided with an output shaft;
the connecting frame extends along the radial direction of the annular fixed seat, and one end of the connecting frame is connected with the bracket; and (c) a second step of,
and the transmission structure is in transmission connection with the output shaft and the other end of the connecting frame.
Optionally, the output shaft of the driving motor is arranged in a horizontal direction;
the transmission structure includes:
the sleeve is sleeved on the outer side of the wind-resistant column and positioned on the inner side of the annular fixing seat, and can rotate relative to the wind-resistant column along the axial direction of the sleeve;
the first gear is arranged on the outer side of the output shaft of the driving motor and can rotate coaxially with the output shaft of the driving motor; and (c) a second step of,
the second gear is arranged outside the sleeve and is meshed with the first gear;
wherein, the other end of link connects the sleeve.
Optionally, the detection assembly comprises:
the mounting frame is arranged at the top end of the support, the support is provided with an installation part, and the installation part is used for being arranged towards one side of the wind-resistant column;
the shooting probe is arranged on the installation part and used for shooting a connection point between the net rack and the wind-resistant column;
wherein the photographing detection part includes the photographing probe.
Optionally, the detection assembly further comprises an adjusting structure, and the adjusting structure is arranged between the mounting frame and the support to adjust the position of the mounting frame in the vertical direction.
Optionally, rack construction detection device still includes the pressure detection subassembly, the pressure detection subassembly is used for locating the rack with between the anti-wind post.
Optionally, the pressure detection subassembly is including being used for locating a plurality of pressure sensor on the top of wind-resistant post, it is a plurality of pressure sensor is used for following wind-resistant post's week side interval is laid, adjacent two the center contained angle that pressure sensor corresponds is alpha, and alpha 360/N, wherein, pressure sensor's quantity is N, and N ≧ 2.
In the technical scheme of the utility model, the connection point between the net rack and the wind-resistant column is shot by the shooting detection part to detect whether the net rack and the wind-resistant column are aligned accurately and stably, so that manual detection is replaced, automatic detection is realized, the safety cost and the labor intensity are reduced, and the working efficiency is improved; meanwhile, the annular fixed seat is detachably sleeved on the outer side of the wind-resistant column; the bottom of support install in on the annular fixing base, and can follow the circumference activity of annular fixing base will shoot the detection portion and locate the support, also, it can to shoot the detection portion wind-resistant post outside is along its circumference activity, also can follow all sides of wind-resistant post shoot its with the junction of rack, so for the testing result is more accurate, reliable stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural view of an embodiment of the grid construction detection device provided by the present invention;
fig. 2 is an enlarged schematic view of a portion a in fig. 1.
The utility model provides an embodiment reference numeral explains:
the realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship between the components, the motion situation, etc. under a certain posture (as shown in the drawings), and if the certain posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In the building industry, the stability of being connected between rack and anti-wind post has important influence to the life of rack, consequently, also increasingly high to the detection requirement of the tie point between rack and the anti-wind post. The traditional detection method is a manual detection method, namely, detection personnel carry a load and work aloft, the problems of high safety cost, high labor intensity, low working efficiency and the like exist, the work is done with half a effort, the requirements on comprehensive qualities of the detection personnel such as mind and body are high, and a substitute automatic detection system is urgently needed.
In view of this, the utility model provides a rack construction detection device. Fig. 1 shows the utility model provides a concrete embodiment of net rack construction detection device.
Referring to fig. 1, the grid construction detection device 100 includes an annular fixing base 1, a bracket 2 and a detection assembly 3, wherein the annular fixing base 1 is detachably sleeved on the outer side of a wind-resistant column 200; the support 2 is arranged vertically, and the bottom of the support 2 is mounted on the annular fixed seat 1 and can move along the circumferential direction of the annular fixed seat 1; detection component 3 is located support 2, detection component 3 is including shooing the detection portion for shoot the rack 300 with tie point between the anti-wind post 200.
In the technical scheme of the utility model, the connection between the net rack 300 and the wind-resistant column 200 is shot by the shooting detection part to detect whether the net rack 300 and the wind-resistant column 200 are aligned accurately and connected stably, so that manual detection is replaced, automatic detection is realized, the safety cost and the labor intensity are reduced, and the working efficiency is improved; meanwhile, the annular fixed seat 1 is detachably sleeved on the outer side of the wind-resistant column 200; the bottom of support 2 install in on the annular fixing base 1, and can follow the circumference activity of annular fixing base 1 will shoot the detection portion and locate support 2, also, shoot the detection portion can wind-resistant post 200 outside is followed its circumference activity, also can follow wind-resistant post 200 all sides shoot its with the junction of rack 300, so for the testing result is more accurate, reliable stable.
Specifically, the grid construction detection device 100 further includes an annular chute 11 and balls 21, which are in sliding fit, wherein the annular chute 11 is arranged on the upper end surface of the annular fixed seat 1 and extends along the peripheral side of the annular fixed seat 1; correspondingly, the ball 21 is arranged at the bottom of the bracket 2; through annular fixing base 1 with support 2 sets up respectively annular spout 11 with ball 21 not only can realize support 2 with the movable mounting of annular fixing base 1, simultaneously, the setting ball 21 makes support 2's activity is more smooth and easy, makes the detection of rack construction detection device 100 is more convenient.
More specifically, at the mouth edge of the annular chute 11, two opposite side walls of the annular chute 11 are respectively provided with a limiting convex part 12 in a protruding manner, and the limiting convex parts 12 are used for limiting the ball 21 up and down; the opening edge of the annular sliding groove 11 is provided with the limiting convex part 12, the ball 21 is limited up and down, the ball 21 is prevented from sliding out of the groove opening of the annular sliding groove 11, and therefore the mounting stability of the support 2 is improved.
In the utility model, the rack construction detection device 100 further comprises a driving assembly 4, and the driving assembly 4 is in driving connection with the bracket 2; through setting up drive assembly 4 drives support 2 rotates, further realizes rack construction detection device 100's automated inspection reduces safe cost and intensity of labour, improves work efficiency.
Specifically, the driving assembly 4 includes a driving motor 41, a connecting frame 42 and a transmission structure 43, the driving motor 41 is disposed at the bottom of the annular fixing seat 1, and the driving motor 41 has an output shaft; the connecting frame 42 extends along the radial direction of the annular fixed seat 1, and one end of the connecting frame 42 is connected with the bracket 2; the transmission structure 43 is in transmission connection with the output shaft and the other end of the connecting frame 42; that is, in this embodiment, the one end of link 42 is connected support 2, the other end of link 42 passes through drive structure 43 with the output shaft links to each other, the output shaft rotates, drives link 42 rotates to drive support 2 rotates, so, realizes the activity of support 2, further realizes rack construction detection device 100's automated inspection, reduces safe cost and intensity of labour, improves work efficiency.
The present invention does not limit the specific form of the transmission structure 43, and the output shaft of the driving motor 41 may be arranged along the vertical direction; the transmission structure 43 comprises a connecting shaft, a gearwheel and a pinion; the connecting shaft is rotatably arranged at the bottom of the annular fixed seat 1, extends up and down and is coaxial with the annular fixed seat 1; the bull gear is arranged on the outer side of the output shaft of the driving motor 41 and can rotate coaxially with the output shaft of the driving motor 41; the lower gear is meshed with the large gear, and the small gear is sleeved on the outer side of the connecting shaft and can rotate coaxially with the connecting shaft; wherein, the other end of the connecting frame 42 is connected with the connecting shaft; that is, when the output shaft of the driving motor 41 rotates, the large gear is driven to rotate, so as to drive the small gear engaged with the large gear to rotate, and further drive the connecting shaft to rotate, so that the driving of the bracket 2 is realized, the structure is simple, and the operation is convenient; specifically, in the present embodiment, the output shaft of the drive motor 41 is disposed in the horizontal direction; the transmission structure 43 comprises a sleeve 431, a first gear 432 and a second gear 433; the sleeve 431 is used for being sleeved outside the wind-resistant column 200 and located inside the annular fixing seat 1, and the sleeve 431 can rotate along the axial direction of the wind-resistant column 200; the first gear 432 is arranged outside the output shaft of the driving motor 41 and can rotate coaxially with the output shaft of the driving motor 41; the second gear 433 is arranged outside the sleeve 431 and meshed with the first gear 432; wherein the other end of the connecting frame 42 is connected with the sleeve 431; that is, when the output shaft of the driving motor 41 rotates, the first gear 432 is driven to rotate, so as to drive the second gear 433 engaged with the first gear to rotate, and further drive the sleeve 431 to rotate, so that the driving of the bracket 2 is realized, and the structure is simple and the operation is convenient.
In the present embodiment, the detection assembly 3 includes a mounting frame 31 and a shooting probe 32; the mounting rack 31 is arranged at the top end of the bracket 2, and the bracket 2 is provided with a mounting part which is used for being arranged towards one side of the wind-resistant column 200; the shooting probe 32 is arranged on the installation part, and the shooting probe 32 is used for shooting the connection part between the net rack 300 and the wind resisting column 200; wherein the photographing detection part includes the photographing probe 32; through setting up the shooting probe 32 is right rack 300 with junction between the anti-wind post 200 is shot, detects rack 300 with whether the anti-wind post 200 counterpoints accurately, connect stably to this replaces artifical the detection, realizes automated inspection, reduces safe cost and intensity of labour, improves work efficiency.
Specifically, the detection assembly 3 further comprises an adjusting structure 33, wherein the adjusting structure 33 is arranged between the mounting frame 31 and the support 2, and is used for adjusting the position of the shooting probe 32 in the up-down direction; that is, by providing the adjusting structure 33, the photographing probe 32 is adjustable in the up-down direction, so that the detecting unit 3 can be used to detect the net racks 300 and the wind-resistant posts 200 having different heights, thereby improving the practicability of the detecting unit 3.
The present invention does not limit the specific form of the adjusting structure 33, and the adjusting structure 33 may be a lead screw structure, and the lead screw structure is disposed between the mounting frame 31 and the bracket 2; specifically, in this embodiment, the adjusting structure 33 includes a sliding fit structure and an electric push rod, the sliding fit structure includes a sliding rail and a groove, which are in sliding fit, one of the sliding rail and the groove is disposed on the mounting bracket 31, and the other is correspondingly disposed on the bracket 2; electric putter's pedestal is located support 2, electric putter's push rod is along setting up from top to bottom, just the expansion end of push rod is connected mounting bracket 31, in order to realize mounting bracket 31's activity, thereby realize shooting probe 32 is adjustable in last decurrent position, so, not only simple structure, simple operation make moreover detection component 3 can be used for detecting not co-altitude rack 300 and anti-wind post 200, thereby improves detection component 3's practicality.
In the present invention, referring to fig. 2, the grid construction detecting device 100 further includes a pressure detecting assembly 5, and the pressure detecting assembly 5 is disposed between the grid 300 and the wind resisting column 200; through the pressure detection subassembly 5 detects rack 300 with whether the counterpoint of anti-wind post 200 is accurate, simple structure, it is convenient to detect.
Specifically, the pressure detection assembly 5 includes a plurality of pressure sensors 51 arranged at the top end of the wind-resistant column 200, the plurality of pressure sensors 51 are arranged at intervals along the circumferential side of the wind-resistant column 200, a center included angle corresponding to two adjacent pressure sensors 51 is α, and α is 360 °/N, where the number of the pressure sensors 51 is N, and N is ≧ 2; so set up, when the rack 300 with when the anti-wind post 200 counterpoints accurately, each the pressure that pressure sensor 51 sensed is even, that is to say, when each the pressure that pressure sensor 51 sensed is inhomogeneous, the rack 300 with the anti-wind post 200 counterpoints inaccurately, and at this moment, the user can readjust the rack 300 with the relative position of anti-wind post 200, so that the rack 300 with the anti-wind post 200 counterpoints accurately, improves the installation stability of rack 300.
The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the conception of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. The utility model provides a rack construction detection device which characterized in that includes:
the annular fixing seat is detachably sleeved on the outer side of the wind-resistant column;
the support is vertically arranged, the bottom of the support is arranged on the annular fixed seat, and the support can move along the circumferential direction of the annular fixed seat; and the number of the first and second groups,
the detection assembly is arranged on the support and comprises a shooting detection part, and the shooting detection part is used for shooting the net rack and connecting points between the wind-resistant columns.
2. The grid construction detection device according to claim 1, further comprising a sliding fit annular chute and a ball, wherein the annular chute is disposed on the upper end surface of the annular fixing seat and extends along the peripheral side of the annular fixing seat;
correspondingly, the ball is arranged at the bottom of the support.
3. A rack construction detecting device according to claim 2, wherein at the opening edge of the annular sliding groove, two opposite side walls of the annular sliding groove are respectively provided with a limiting convex part in a protruding manner, and the limiting convex parts are used for limiting the ball in an up-down and up-down direction.
4. The rack construction detection device of claim 1, further comprising a drive assembly drivingly connected to the support.
5. The rack construction detecting apparatus of claim 4, wherein the driving assembly comprises:
the driving motor is arranged at the bottom of the annular fixed seat and is provided with an output shaft;
the connecting frame extends along the radial direction of the annular fixed seat, and one end of the connecting frame is connected with the bracket; and the number of the first and second groups,
and the transmission structure is in transmission connection with the output shaft and the other end of the connecting frame.
6. The rack construction detecting device according to claim 5, wherein an output shaft of the driving motor is disposed in a horizontal direction;
the transmission structure includes:
the sleeve is sleeved on the outer side of the wind-resistant column and positioned on the inner side of the annular fixing seat, and can rotate relative to the wind-resistant column along the axial direction of the sleeve;
the first gear is arranged on the outer side of the output shaft of the driving motor and can rotate coaxially with the output shaft of the driving motor; and (c) a second step of,
the second gear is arranged outside the sleeve and is meshed with the first gear;
wherein, the other end of link connects the sleeve.
7. The grid construction detecting device according to claim 1, wherein the detecting member comprises:
the mounting frame is arranged at the top end of the support, the support is provided with an installation part, and the installation part is used for being arranged towards one side of the wind-resistant column;
the shooting probe is arranged on the installation part and used for shooting a connection point between the net rack and the wind-resistant column;
wherein the photographing detection part includes the photographing probe.
8. The rack construction detecting device according to claim 7, wherein the detecting assembly further comprises an adjusting structure provided between the mounting bracket and the support bracket for adjusting the position of the mounting bracket in the up-down direction.
9. A rack construction detection device as recited in claim 1, further comprising a pressure detection assembly for being disposed between the rack and the wind-resistant column.
10. A grid structure construction detection device according to claim 9, wherein the pressure detection assembly includes a plurality of pressure sensors arranged at the top end of the wind-resistant column, the plurality of pressure sensors are arranged at intervals along the peripheral side of the wind-resistant column, the central included angle between two adjacent pressure sensors is α, and α ≧ 360 °/N, wherein the number of pressure sensors is N, and N ≧ 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220579288.2U CN217424275U (en) | 2022-03-16 | 2022-03-16 | Net rack construction detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220579288.2U CN217424275U (en) | 2022-03-16 | 2022-03-16 | Net rack construction detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217424275U true CN217424275U (en) | 2022-09-13 |
Family
ID=83179275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220579288.2U Active CN217424275U (en) | 2022-03-16 | 2022-03-16 | Net rack construction detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217424275U (en) |
-
2022
- 2022-03-16 CN CN202220579288.2U patent/CN217424275U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100585343C (en) | Over-limit measuring instrument and method of railway transportation equipment | |
| CN217424275U (en) | Net rack construction detection device | |
| CN101858819B (en) | Anti-elasticity testing instrument for balls and testing method thereof | |
| CN208780682U (en) | A kind of environmental quality monitors tele-control system automatically | |
| CN109900307A (en) | A kind of Meteorological Service for Tourism system equipment based on big data | |
| CN210570814U (en) | Environment monitoring and analyzing equipment | |
| CN108525259A (en) | A kind of system for football positioning ball test | |
| CN110514866B (en) | Assembled anemograph support capable of automatically correcting | |
| CN209512906U (en) | A kind of solder joint automatic detection device | |
| CN209673818U (en) | A kind of detection scanning means | |
| CN215678446U (en) | Telescopic fire control detection device of dismantling | |
| CN216695379U (en) | Multidirectional force detection device of assembly type building structure | |
| CN210119588U (en) | Small-size automatic meteorological station monitoring devices in agricultural wheat field | |
| CN218819232U (en) | Modularization intelligence frock suitable for high energy X ray device | |
| CN216131696U (en) | Height-adjustable surveying and mapping device | |
| CN219842446U (en) | Clamp device for multidirectional adjustment of rotation speed sensor | |
| CN217105017U (en) | Full-automatic multifunctional foundation bearing capacity sounding instrument | |
| CN216900607U (en) | Pitot tube clamping and feeding device for detecting gas | |
| CN217637107U (en) | Measuring device for horizontal deviation of rubber support for building | |
| CN211261312U (en) | Split heat exchanger of solar water heating system | |
| CN216081979U (en) | Multi-probe photometric device | |
| CN210955687U (en) | Engineering economics analysis model device | |
| CN209764108U (en) | Building engineering detection equipment | |
| CN212567461U (en) | Environment monitoring device with dustproof function | |
| CN220120137U (en) | Multipurpose environment detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 215000 No.10 Datong Road, high tech Zone, Suzhou City, Jiangsu Province Patentee after: China Railway Construction Urban Construction Transportation Development Co.,Ltd. Country or region after: China Address before: 215000 No.10 Datong Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: NO.1 ENGINEERING CORPORATION LIMITED OF CR20G Country or region before: China |